Patent Application
20180021769
The present invention belongs to the technical fields of petroleum processing and chemical industry, and specifically to performing heavy oil catalytic conversion and the catalytic conversion of light hydrocarbons such as inferior gasoline by using cycling method of cold regenerated catalyst and the device thereof.
As the deterioration and heavier trend of crude oil quality are increasingly aggravated, the blending ratio of residual oil from catalytic cracking keeps increasing. Catalytic cracking devices, in particular heavy oil catalytic cracking devices, have relatively high dry gas coke yield, relatively low overall yield of light oil and relatively high olefin and sulfur contents of gasoline, which cannot satisfy the requirements of new national standards on gasoline.
Heavy oil catalytic cracking, due to the heavy raw materials and high carbon residue values, has a rising coke yield, and the heat exceeds what the system needs, which results in overplus heat. Therefore, heavy oil catalytic cracking devices must be provided with a heat removing device, to remove the overplus heat, to maintain the heat balance between the two devices.
The types of the conventional catalyst coolers for removing the overplus heat of the system in heavy oil catalytic cracking processes are various. The conventional heat removing technique, that is, catalyst cooling technique, because the returning of cold regenerated catalyst to the regenerator dense phase section only has heat removing function, cannot optimize the operation conditions of the reaction system. Therefore, the techniques of the conventional reaction regeneration systems all have drawbacks.
U.S. Pat. No. 5,451,313 discloses a FCC method, in which the catalyst to be regenerated and the regenerated catalyst are mixed and cycled to reduce the severity of the method, improve the atomization of the feedstock, and promote the contact with the catalyst. However, the method does not propose that the catalyst cooler is used for simultaneously cooling the regenerator bed layer and cooling the regenerated catalyst of the riser cracking feedstock.
In the “X design” technique that is developed by UOP Company (World Petroleum Science, 1996, 3 (9)), its characteristic is that part of the catalyst to be regenerated, without carbon burning regeneration, after mixing with the regenerated catalyst in a mixing tank, directly returns to the riser reactor, and because the regenerated catalyst is cooled, the catalyst-to-oil ratio increases. The drawback of the technique is that the regenerated catalyst and the catalyst to be regenerated are directly mixed, which reduces the activity of the catalyst that enters the riser reactor, which is adverse to the catalytic cracking reaction.
The flexible and multiple-effect catalytic cracking process that is developed by Luoyang Petrochemical Industry Engineering Corporation (CN92105596.X) employs double riser reactors, and by mixing and together cycling the catalyst to be regenerated and the regenerated catalyst of the gasoline riser, increases the catalyst-to-oil ratio, improves the atomization of the feedstock, and promotes the contact with the catalyst. One riser acts as the gasoline upgrading reaction zone and utilizes high-activity catalyst upgrading gasoline, and another riser acts as the FCC main riser reaction zone. The process is required to compromise the reaction conditions of the heavy oil catalytic cracking of the main riser and the gasoline upgrading of the gasoline riser, and the current bias or mixing of the cold catalyst and the hot catalyst is not uniform (that is, the homogenization and the soaking are not good) and the spent catalyst activity is low, which is adverse to the catalytic cracking reaction of the main riser.
The MIP technique innovatively proposes the concept of second reaction zone, which is to, by using series connected riser reactors, divide the reaction into two reaction zones, wherein the first reaction zone mainly performs cracking reaction and employs a relatively high reaction temperature, and the second reaction zone employs a relatively low reaction temperature, a relatively low high catalyst-to-oil ratio and a relatively low long reaction time, and mainly performs reactions such as hydrogen transfer, aromatization and isomerization. The method, by mixing and together cycling the catalyst to be regenerated and the regenerated catalyst in the second reaction zone, increases the catalyst-to-oil ratio of the second reaction zone, and the current bias or mixing of the cold catalyst and the hot catalyst is not uniform (that is, the homogenization and the soaking are not good) and the spent catalyst activity is low, which is adverse to the catalytic cracking reaction of the first reaction zone.
Chinese patents CN1288932A and CN1288933A disclose new techniques of removing heat of transporting pipe of regenerated catalyst, which, on the precondition of ensuring a regenerator temperature high enough and a favorable regeneration effect, reduce the temperature of the regenerated catalyst that enters the reactor, increase the warming-up temperature of the raw material oil, improve the atomization effect of the raw material, increase the catalyst-to-oil ratio, improve product distribution, and increase the liquid yield.
However, the techniques both do not propose how to realize operation of large catalyst-to-oil ratio, and how to overcome the increasing of the cycling system resistant force that is caused by the increasing of the catalyst-to-oil ratio, to truly make the catalyst-to-oil ratio as an independently adjustable variable.
The object of the present invention is to, on the basis of the prior arts, which utilizes the catalyst cooling technique that is commonly used in catalytic cracking process, employ dense bed operation, to increase the driving force of the catalyst cycling, to overcome the increasing of the cycling system resistant force that is caused by the increasing of the catalyst-to-oil ratio, to truly makes the catalyst-to-oil ratio as an independently adjustable variable, to solve the currently commonly existing contradiction between regeneration temperature, feeding temperature, reaction temperature and catalyst-to-oil ratio, satisfy the requirements on catalytic cracking reaction of “low temperature contact, large catalyst-to-oil ratio and high catalyst activity”, and create favorable reaction conditions for catalytic cracking reaction.
Another object of the present invention is to, on the precondition of ensuring a regeneration temperature high enough and a favorable regeneration effect, by the cycling method of cold regenerated catalyst, reduce the temperature of the regenerated catalyst that enters the reactor, increase the warming-up temperature of the raw material oil, improve the atomization effect of the raw material oil, increase the catalyst-to-oil ratio, increase the reaction selectivity, improve the product distribution of heavy oil catalytic cracking, and increase the liquid yield.
Another object of the present invention is to, on the precondition of ensuring a proper catalyst-to-oil ratio, reduce the reaction temperature of gasoline upgrading riser, increase the catalyst activity of gasoline riser, promote the proceeding of reactions such as hydrogen transfer, isomerization and aromatization, and reduce the yields of coke and gases, thereby increasing the yields of gasoline and light fractions, increasing the octane number of gasoline, and reducing the olefin and impurity contents of the oil products.
The technical problem that the present invention seeks to solve is to provide a cycling method of a cold regenerated catalyst or a contact agent (both hereinafter referred to as catalyst), which utilizes the catalyst cooling technique that is commonly used in catalytic cracking process, increases the driving force of the catalyst cycling system by using the operation of low-speed dense beds to overcome the increasing cycling system resistant force that is caused by the increasing of catalyst-to-oil ratio, and truly makes the catalyst-to-oil ratio as an independently adjustable variable, to solve the currently commonly existing contradiction between regeneration temperature, feeding temperature, reaction temperature and catalyst-to-oil ratio, to realize the separate optimization of the reaction zones of the riser and/or the fluidized bed reactor, and truly realize the optimization control of reaction depth.
The present invention provides a cycling method of cold regenerated catalyst and an equipment thereof, comprising a gas-solid reaction regeneration process, wherein: a hydrocarbon raw material performs a contact reaction with a catalyst in reaction zones of a riser reactor (having or not having a fluidized bed reactor), a reactant stream enters a settler to perform a separation of the catalyst and an oil gas, the separated spent catalyst is steam stripped by a steam stripping section and enters a regenerator to be charring regenerated, and the regenerated catalyst after being cooled and/or without being cooled directly returns to the riser reactor to be circularly used, wherein the special features are as follows:
1) the regenerator is provided with one, two or more catalyst coolers, for adjusting reaction temperatures of reaction zones of the riser reactors (and/or the fluidized bed reactors) that are individually connected, and/or adjusting the temperature of the regenerator, to maintain them at the optimum values; and each of the catalyst coolers is provided with one, two or more catalyst outlets, for transporting the cold regenerated catalyst to the reaction zones of the one, two or more riser reactors (and/or fluidized bed reactors) and/or for transporting the cold regenerated catalyst to the regenerator;
2) part of the regenerated catalyst from the regenerator is cooled by the catalyst cooler to 200-720° C. (preferably 360-650° C.), directly enters a pre-lift zone and/or the reaction zones of the riser reactor (and/or the reaction zones of the fluidized bed reactor) and/or mixes with another part of hot regenerated catalyst that has not been cooled to obtain a mixed regenerated catalyst with a temperature below the regenerator temperature, and enters a pre-lift zone and/or the reaction zones of the riser reactor (and/or the reaction zones of the fluidized bed reactor); or the cold regenerated catalyst and the hot regenerated catalyst individually directly enter pre-lift zones of the riser, are lifted by a pre-lift medium to reach an equilibrium temperature, enter the reaction zones of the riser reactor (and/or the reaction zones of the fluidized bed reactor) or without passing through the catalyst cooler directly enter a pre-lift zone and/or the reaction zones of the riser reactor (and/or the reaction zones of the fluidized bed reactor), to be circularly used; and
each of the riser reactors is provided with one, two or more reaction zones having or not having a fluidized bed reactor, before the cold regenerated catalyst enters the riser reactor (and/or the fluidized bed reactor) a pre-riser and/or mixer is or is not provided, and a pre-lift medium transports the cold regenerated catalyst to the riser reactor (and/or the fluidized bed reactor); and
3) the bottom of each of the catalyst coolers is provided with at least one fluidized medium distributor, a fluidized medium mainly enters the catalyst cooler from the distributor, a range of a superficial gas velocity (a ratio of a volume flow rate of the fluidized medium to the cooler cross-section) is 0-0.7 m/s (preferably 0.005-0.3 m/s, and most preferably 0.01-0.15 m/s), and the temperature of the cold regenerated catalyst is controlled mainly by adjusting a flow rate of the fluidized medium; and
the regenerated catalyst that enters each of the catalyst coolers is a regenerated catalyst or a regenerated catalyst without completed regeneration with any carbon content, or is a spent catalyst or contact agent or coking particles with any carbon content.
Each of the catalyst coolers may be provided outside or inside the regenerator, or provided below the riser reactor (and/or the fluidized bed reactor) that is connected thereto.
A cold catalyst transporting channel to the reaction zones of the riser reactor (and/or the fluidized bed reactor) is wholly or partially provided outside a catalyst cooler shell or inside a catalyst cooler shell. A transporting channel of the cold catalyst that returns to the regenerator is wholly or partially provided outside a catalyst cooler shell or inside a catalyst cooler shell.
According to the process requirements, the transporting channel to the cold catalyst that returns to the regenerator may be not provided.
The pre-lift section may be wholly (or partially) provided outside or inside the catalyst cooler shell that is connected thereto.
According to the process requirements, one, two or more auxiliary risers are provided (or are not provided), connecting to a cold regenerated catalyst transporting channel (such as an external cycling pipe or an internal cycling pipe), for transporting the cold regenerated catalyst (rising by the pre-lift medium) to the reaction zones of the one, two or more riser reactors (and/or fluidized bed reactors) as the cold-shocking agent or as the cold-shocking agent after being mixed with another gaseous or liquid cold-shocking agent, to be circularly used.
The gaseous or liquid cold-shocking agent is water, oil products including gasoline, recycle oil and clarified oil, and a mixture of one, two or more catalysts with any carbon content including a cold regenerated catalyst, a cold spent catalyst and a cold half-regenerated catalyst.
Catalyst coolers are a mature industrial equipment. The method and the device thereof of the present invention can employ various structure forms (such as upflow type and downflow type), the heat exchange element (including heat removing tubes, heat removing tube bundle and the like) can employ various structures and connection modes, and the catalyst transporting channel can employ various special connection structures (such as inner cycling pipe, and Y-type and U-type outer transporting (cycling) pipes). A person skilled in the art is very familiar with the special structures, connection modes and operation and control processes, and that does not limit any special implementation of the concept of the present invention.
The temperature of the mixed regenerated catalyst that enters the reaction zones of the riser reactor (and/or the fluidized bed reactor) can be independently controlled by adjusting a proportion of the cold regenerated catalyst and the hot regenerated catalyst and/or another parameter. When the cold regenerated catalyst that has been cooled by the catalyst cooler directly enters the riser reactor (and/or the fluidized bed reactor), the temperature of the cold regenerated catalyst that enters the reaction zones of the riser reactor (and/or the fluidized bed reactor) is controlled by adjusting the flow rate of the fluidized medium and/or a heat removing medium and/or a transporting medium and/or another parameter; or is controlled by adjusting the flow rate of the fluidized medium and/or a heat removing medium and/or a transporting medium and/or the flow rate of a cold catalyst that returns to the regenerator and/or another parameter. Therefore, the catalyst-to-oil ratio (the proportion between the regenerated catalyst and the raw material) and the reaction temperature of the riser reactor (and/or the fluidized bed reactor) can both be independently controlled.
According to the process requirements, the catalyst cooler for adjusting the regenerator temperature may be not provided, and/or any one, two or more of the catalyst coolers for adjusting the reaction temperatures of the reaction zones of the riser reactor (and/or the fluidized bed reactor) may also be not provided, and the hot regenerated catalyst directly enters the riser.
When the catalyst cooler for adjusting the regenerator temperature is not provided and only one, two or more catalyst coolers that are connected to the riser reactor (and/or the fluidized bed reactor) are provided, the regenerator temperature is controlled mainly by adjusting the thermal balance of the reaction regeneration system, and/or is controlled mainly by adjusting the flow rate or another parameter of the fluidized medium and/or the heat removing medium and/or the catalyst that returns to the regenerator of one, two or more of those catalyst coolers.
When any one, two or more of the catalyst coolers for adjusting the reaction temperatures of the reaction zones of the riser reactor (and/or the fluidized bed reactor) are not provided, the regenerator temperature is controlled mainly by adjusting the thermal balance of the reaction regeneration system; and/or is controlled mainly by adjusting the flow rate or another parameter of the fluidized medium and/or the heat removing medium and/or the catalyst that returns to the regenerator of the catalyst cooler that is not connected to the riser; and/or is controlled mainly by adjusting the flow rate or another parameter of the fluidized medium and/or the heat removing medium and/or the catalyst that returns to the regenerator of the catalyst cooler that is connected to the riser.
The reaction temperatures of the reaction zones of the riser reactor (and/or the fluidized bed reactor) are controlled mainly by adjusting the catalyst-to-oil ratio (by providing a controlling element such as a slide valve and a plug valve in the cold catalyst returning channel), and/or are controlled mainly by adjusting the temperature of the cold regenerated catalyst or the mixed regenerated catalyst, to maintain them at the optimum values.
Certainly, there can be many other controlling equipments and controlling methods, which are very familiar to a person skilled in the art, and that does not limit any special implementation of the concept of the present invention.
The fluidized medium and the transporting medium may be air, steam or other gases or their mixtures, and the heat removing medium may be water, steam, air or other gases, oil products, or their mixtures. The pre-lift medium may be water, steam or other gases, refinery dry gases, or their mixtures.
The regenerated catalyst that enters the catalyst cooler may be a regenerated catalyst or a regenerated catalyst without completed regeneration with any carbon content. The regenerated catalyst that enters the catalyst cooler further comprises a spent catalyst or contact agent or coking particles with any carbon content.
The catalyst cooler may be integral with the regenerator and the riser, and may also be connected thereto by pipeline.
The present invention further provides a catalyst cooling equipment for implementing the cycling method of regenerated catalyst, which is generally a fluidized bed that is provided with a vertical heat exchange tube bundle. The fluidized bed is mainly provided with, from bottom to top, a catalyst outlet, a fluidized medium distributor, a heat exchange tube, a dense phase fluidized bed, a degassing equilibration orifice and a catalyst inlet, wherein a plurality of heat exchange tubes are vertically distributed to form a heat exchange tube bundle, extend from the top of the fluidized bed to the lower part of the fluidized bed, and are submerged in the dense phase fluidized bed.
The cycling method of cold regenerated catalyst and an equipment thereof of the present invention can be used for catalytic cracking devices of various reaction regeneration patterns (such as linear type and parallel type), and has various combination patterns with the regenerator, such as being provided at a first regenerator or being provided at a second regenerator. A person skilled in the art is very familiar with the combination modes and operation and control processes, and that does not limit any special implementation of the concept of the present invention.
Regarding the catalytic cracking device that employs the cycling method of cold regenerated catalyst and an equipment thereof of the present invention, the separation of its reaction products and the regeneration of the catalyst are both performed according to conventional methods, which can employ various reaction regeneration patterns that are used by riser catalytic cracking processes and devices, including various riser patterns (including constant diameter or varying diameter, having or not having a fluidized bed reactor and the like), various regeneration patterns and various combination patterns thereof. The spent catalyst performs charring regeneration in the regenerator under the conventional conditions for catalytic cracking catalyst regeneration, and in general the regeneration temperature is controlled at 630-800° C. (preferably 680-730° C.).
The riser catalytic cracking processes and devices are mature industrial processes, a person skilled in the art is very familiar with the combination modes and operation and control processes, and that does not limit any special implementation of the concept of the present invention. The present invention has no limitation on the choosing of the catalyst and the processing conditions.
The cycling method of cold regenerated catalyst and an equipment thereof of the present invention has an extensive application, and can be used for various fluidized catalytic cracking processes, including heavy oil catalytic conversion, wax oil catalytic conversion, gasoline catalytic reforming, light hydrocarbon (liquefied petroleum gas, C4, C5, gasoline, and the like) catalytic conversion and the like, and can be used for other gas-solid fluidization reaction charring processes, including residual oil pretreating, methanol to olefin (MTO), methanol to propylene (MTP), methanol to aromatics (MTA), fluid coking, flexicoking and the like. The cycling method of cold regenerated catalyst and an equipment thereof can be singly implemented, for the reaction zones of a riser reactor (and/or fluidized bed reactor) of fluidized catalytic cracking processes, and according to the process requirements, one, two or more auxiliary risers can be provided to transport to the reaction zones of the riser reactor (and/or the fluidized bed reactor) as the cold-shocking agent; or be jointly implemented, for the reaction zones of one, two or more riser reactors (and/or fluidized bed reactors) in two or more riser reactors that have different functions, including for the reaction zones of a heavy oil riser and a gasoline riser of a double riser catalytic cracking device or one or two riser reactors in two or more risers for processing different raw materials, and according to the process requirements, one, two or more auxiliary risers can be provided to transport to the reaction zones of the riser reactor (and/or the fluidized bed reactor) as the cold-shocking agent.
The method of cycling a cold regenerated catalyst and an equipment thereof of the present invention can be applied to heavy oil catalytic cracking process. Heavy petroleum hydrocarbons are mixed with the cold regenerated catalyst that is from the heavy oil riser pre-lift zone (which may also be not provided), and enter the heavy oil riser reactor (having or not having a fluidized bed reactor). The main operation conditions are as follows: reaction temperature 400-650° C. (preferably 480-600° C.), reaction pressure 0.11-0.4 MPa, contact time 0.05-5 seconds (preferably 0.1-3 seconds), and the weight ratio of the catalyst to the raw material (catalyst-to-oil ratio) generally 3-15, and preferably 5-12.
In the heavy oil catalytic cracking process that applies the present invention, compared with the prior art, the operation condition of the heavy oil riser reactor is relatively independent, and the operation conditions such as the reaction temperature, the catalyst-to-oil ratio and the warming-up temperature of the raw material can be flexibly adjusted according to the property of the heavy oil and the reaction requirements. Therefore, the method can increase the slag ratio, process inferior heavy oil and increase light oil yield. The method can better reduce the volume content of gasoline olefins, can increase the octane number of gasoline and reduce the impurity content of oil products, and meanwhile has the advantages of good operability, flexible operation and extensive application.
Compared with the prior art, the present invention employs low-speed dense bed operation, and can increase the density of the cycling catalyst, increase the driving force of the cycling system, overcome the system resistant force increasing caused by increasing circulation, and truly realize the operation of high catalyst-to-oil ratio. The method, without reducing the regeneration temperature, by reducing the regenerated catalyst temperature, truly causes catalyst-to-oil ratio, feeding temperature, reaction temperature and regeneration temperature to become independently adjustable variables, to realize the separate optimization of the reaction zones of the riser and/or the fluidized bed reactor, and truly realize the optimization control of the reaction depth of catalytic cracking, thereby reducing hard coke and dry gas, improving product distribution and product quality, and reducing the energy consumption and fume emission of the device. Therefore, the present invention has the following advantages:
1) The raw material has better atomization effect.
While increasing the catalyst-to-oil ratio, the method can employ a proper high feeding temperature, to improvement the atomization of the raw material, promote the contact with the catalyst, and thereby reduce the yields of hard coke and dry gas.
2) The method can flexibly adjust the reaction temperatures of the reaction zones and the regeneration temperature of the regenerator, to maintain it at the optimum value. Therefore, the reaction zones of the riser and/or the fluidized bed reactor can employ a proper reaction time and a proper reaction temperature, thereby reducing hard coke and dry gas, and improving product distribution and product quality.
3) The method can employ a proper high regeneration temperature.
The regeneration temperature is not restricted by the catalyst-to-oil ratio and the warming-up temperature of the raw material, and the regeneration temperature can be increased, which facilities high-efficiency regeneration and can passivate heavy metals. The high regeneration temperature causes fume to carry over more heat and the heat removing quantity is reduced.
4) The catalyst has higher activity.
Because the temperature of the regenerated catalyst is reduced, the hydrothermal inactivation of the regenerated catalyst in the pre-lift section of the riser is alleviated.
5) The increasing of the cycling catalyst density reduces the air quantity that is entrained by the cycling catalyst, thereby reducing the content of non-hydrocarbon gases such as nitrogen in the dry gas, increasing the calorific capacity of dry gas, and reducing the power consumption of rich gas compressor.
6) The consumption of fluidization wind is reduced by approximately 80%, the overall consumption of boosting air is reduced by approximately 50%, and the power consumption of booster is reduced by approximately 50%.
7) The present invention employs low-speed dense bed operation, the shell side line speed of the outer heat remover is very low (preferably 0.005-0.3 m/s, and most preferably 0.01-0.15 m/s), and the catalyst particles have very small abrasion on the heat removing tube bundle, which facilitates prolonging the service life of the heat remover.
8) The method has better effects when used along with other techniques.
The using of the technique does not impact the using of other techniques. For example, when it is used along with the conventional dense-phase heat removing technique, riser reaction termination agent injection technique or multiple reaction zone multiple feeding technique, the effect is better. Certainly, it can be used along with many other process techniques and methods, and that does not limit any special implementation of the concept of the present invention.
Compared with the single employing of mixed temperature controlling technique and termination agent injection technique, the method has higher heat removing temperature level and more reasonable heat utilization.
The method of cycling a cold regenerated catalyst and an equipment thereof of the present invention can also be applied to gasoline catalytic conversion, wherein the operation condition of the riser reactor is relatively independent, and the operation conditions such as the reaction temperature, the catalyst-to-oil ratio and the warming-up temperature of the raw material can be flexibly adjusted according to the reaction requirements.
The method employed by the present invention, compared with the prior art, the method can better reduce the volume content of gasoline olefins, can increase the octane number of gasoline and reduce the impurity content of oil products, and meanwhile has the advantages of good operability, flexible operation and extensive application. Compared with the prior art, after inferior gasoline goes through the catalytic conversion device of the present invention, the volume content of olefins in the gasoline can be reduced to 30-70%, the octane number (RON) can be increased by 0.5-40 units, and the sulfur content of the gasoline can be reduced by 30% (weight).
Gasoline (gaseous or liquid) after or not after being warmed up enters the riser, is mixed with the cold regenerated catalyst that is from the gasoline riser pre-lift zone (which may also be not provided), and enters the gasoline riser reactor (having or not having a fluidized bed reactor), to mainly perform gasoline upgrading reactions such as isomerization and aromatization, to reduce the contents of olefins, sulfur and nitrogen, to increase the octane value.
When the gasoline catalytic conversion reforming process of the present invention is applied, the main operation conditions are as follows: reaction temperature 350-650° C. (preferably 400-600° C.), absolute pressure 0.11-0.4 MPa, and contact time 0.5-30 seconds (preferably 1-15 seconds).
The gasoline catalytic conversion process of the present invention can be implemented jointly with the heavy oil catalytic cracking process, and can also be singly implemented. The operation conditions of the gasoline riser reactor can be adjusted relatively independently and more flexibly, and conditions such as the reaction temperature can be flexibly adjusted according to the market:
1) By using lower reaction temperatures, producing gasoline of a low sulfur content, a low olefin content and a high octane number.
When clean gasoline is to be produced with the aim of reducing the contents of olefins and sulfur of the gasoline, the reaction temperature can be very low (350-520° C., and preferably 400-480° C.), to cause the ideal secondary reactions such as isomerization, hydrogen transfer, aromatization and alkylation to be overwhelm when the durations are ensured. The light oil yield is greater than 98.5%.
2) By using higher reaction temperatures, producing liquefied gas and light olefins with high capacities, and meanwhile producing gasoline of a low sulfur content, a low olefin content and a high octane number.
When it is required to produce liquefied gas and light olefins with high capacities, the reaction temperature can be very high (500-650° C., and preferably 520-600° C.), to cause reactions such as olefin cracking to overwhelm, and meanwhile to realize the objects of increasing diesel to gasoline ratio, reducing the olefin and sulfur contents of the gasoline and producing clean gasoline of a high octane number.
The gasoline fraction may be whole fraction, for example, a fraction with an initial boiling point of about 220° C., and may also be a narrow fraction in that, for example, a fraction of 70-145° C. The gasoline fraction may be a primarily processed gasoline fraction such as straight run gasoline and condensate oil, a secondarily processed gasoline fraction such as charring gasoline, FCC gasoline, visbreaking gasoline and thermal cracking gasoline, or a mixture of more than one gasoline fractions. The olefin content of the gasoline fraction may be 0-80 weight %, and it may contain impurities of a small quantity such as sulfur and nitrogen, for example, with a sulfur content of greater than 200 ppm and a nitrogen content of greater than 30 ppm.
The inferior gasoline of fraction or narrow fraction is one, two, more and the mixture gasolines of the gasolines including straight run gasoline, condensate oil, catalytic cracking gasoline, thermal cracking gasoline, visbreaking gasoline, charring gasoline, cracking ethylene gasoline.
The features of the invention believed to be novel and the elements characteristic of the invention are set forth with particularity in the appended claims. The figures are for illustration purposes only and are not drawn to scale. The invention itself, however, both as to organization and method of operation, may best be understood by reference to the detailed description which follows taken in conjunction with the accompanying drawings in which:
In order to make the objects, the technical solutions and the advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below by referring to the drawings of the embodiments of the present invention. Apparently, the described embodiments are part of embodiments of the present invention, rather than all embodiments. On the basis of the described embodiments of the present invention, all the other embodiments that a person skilled in the art obtains without paying creative work are within the protection scope of the present invention.
The present invention will be further described by referring to the drawings below.
As shown in
The regenerator is provided with 2 inner or outer heat removing equipments, that is, catalyst coolers, which comprise a catalyst inlet, a lower mixing buffering space, an inner heat removing element (including telescope type and coil pipe type) and a lower fluidized medium distributing installation, which are directly (or by pipeline) connected to the regenerator dense phase.
The catalyst cooler 8A is mainly for adjusting the reaction temperature of a first reaction zone, to maintain it at the optimum value. The other catalyst cooler (not shown in the figure) is mainly for adjusting the regenerator temperature, to maintain it at the optimum value. 35A is the fluidized medium such as air and steam, 36A is the rising medium such as air and steam, and 37A is the heat removing medium, including water, steam, air, oil products and the like.
The regenerator 5 is connected to the catalyst cooler 8A by the regenerated catalyst transporting pipe 10A, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9A. The cold regenerated catalyst is connected to the riser reactor pre-lift zone 4 by the cold regenerated catalyst transporting pipe 11A. The temperature of the cold regenerated catalyst that leaves the catalyst cooler 8A (lower mixing buffering space 9A) is controlled by adjusting the flow rate of the fluidized medium 35A (including air, steam and the like) and/or the flow rate of the rising medium 36A (including air, steam and the like) on the cold regenerated catalyst returning pipe 12A. The controlling valve 21A is a special controlling element that is provided for conveniently controlling the flow rate of the cold regenerated catalyst.
In order to conveniently control the temperature of the reaction zones of the riser reactor, a hot regenerated catalyst transporting pipe (including a controlling valve) (not shown in the figure) may be provided to connect the regenerator 5 directly to the heavy oil riser reactor pre-lift zone 4, the cold regenerated catalyst and the hot regenerated catalyst, after being mixed in the riser reactor pre-lift zone 4, raise the temperature by the pre-lift medium 32 (including water, steam, refinery dry gases and the like) to reach the equilibrium.
The heavy oil riser reactor may also be provided with 2 reaction zones, and the cold regenerated catalyst enters the auxiliary riser via the cold regenerated catalyst transporting pipe, and is transported by the pre-lift medium to the second reaction zone of the riser reactor as the cold-shocking agent (not shown in the figure).
According to the process requirements, the catalyst cooler mainly for adjusting the regenerator temperature may be not provided. The temperature of the regenerator 5 is controlled by adjusting the flow rate of the fluidized medium 35A, including air, steam and the like, and the flow rate of the rising medium 36A, including air, steam and the like, on the cold regenerated catalyst returning pipe 12A.
Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
The catalyst cooler may be integral with the regenerator and the riser, and may also be connected thereto by pipeline.
The cold regenerated catalyst that has been cooled to 200-720° C. (preferably 360-650° C.) enters the riser reactor 2 via the pre-lift zone 4. The hydrocarbon raw material performs the contact reaction with the catalyst in the riser reactor 2, the reactant stream enters the settler 1 to perform the separation of the catalyst and the oil gas, and the separated spent catalyst is steam stripped by the steam stripping section 1A, enters the regenerator 5, and is charring regenerated in the present of the oxygen-containing gas 38 (including air and the like). The regenerated catalyst after being cooled or directly returns to the riser reactor to be circularly used.
The catalyst cooler is provided with at least one fluidized medium distributor. The fluidized medium enters the catalyst cooler via the bottom distributor of the catalyst cooler, wherein the superficial gas velocity is 0-0.7 m/s (preferably 0.005-0.3 m/s, and most preferably 0.01-0.15 m/s), and the temperature of the cold regenerated catalyst is controlled mainly by adjusting a flow rate of the fluidized medium.
As shown in
The regenerator is provided with 2 inner or outer heat removing equipments, that is, catalyst coolers, which comprise a catalyst inlet, a lower mixing buffering space, an inner heat removing element (including telescope type and coil pipe type) and a lower fluidized medium distributing installation, which are directly (or by pipeline) connected to the regenerator dense phase.
35A, 35B are the fluidized medium such as air, water and steam, 36A, 36B are the rising medium such as air and steam, and 37A, 376 are the heat removing medium, including water, steam, air, oil products and the like. The catalyst cooler 8A is mainly for adjusting the reaction temperature of a first reaction zone, to maintain it at the optimum value. The catalyst cooler 8B is mainly for adjusting the regenerator temperature, to maintain it at the optimum value.
According to the process requirements, any one or two of the catalyst cooler 8A and the catalyst cooler 8B may be not provided.
The regenerator 5 is connected to the catalyst cooler 8A by the regenerated catalyst transporting pipe 10A, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9A. The cold regenerated catalyst is connected to the heavy oil riser reactor pre-lift zone 4 by the cold regenerated catalyst transporting pipe 11A. The temperature of the cold regenerated catalyst that leaves the catalyst cooler 8A is controlled by adjusting the flow rate of the fluidized medium 35A (including air, steam and the like) and/or the flow rate of the rising medium 36A (including air, steam and the like) on the cold regenerated catalyst returning pipe 12A. The controlling valve 21A is a special controlling element that is provided for conveniently controlling the flow rate of the cold regenerated catalyst.
In order to conveniently control the temperature of the first reaction zone of the heavy oil riser reactor, a hot regenerated catalyst transporting pipe (including a controlling valve) (not shown in the figure) that is directly connect to the heavy oil riser reactor pre-lift zone 4 may be provided. The cold regenerated catalyst and the hot regenerated catalyst, after being mixed in the heavy oil riser reactor pre-lift zone 4, raise the temperature by the pre-lift medium 32 (including water, steam, refinery dry gases and the like) to reach the equilibrium.
Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
In order to conveniently control the temperature of the second reaction zone 2 of the riser reactor, the cold-shocking agent 34 may be injected into the downstream of the first reaction zone, to conveniently control the temperature of the second reaction zone 2. The cold-shocking agent may be any one of a gas or a liquid (including water, oil products and the like) and a cold catalyst, and may also be two or more of them. The cold catalyst may be any one of a cold regenerated catalyst, a cold spent catalyst and a cold half-regenerated catalyst, and may also be two or more of them.
The cold regenerated catalyst, when it is as the cold-shocking agent, may enter the auxiliary riser via the cold regenerated catalyst transporting pipe, and is transported by the pre-lift medium to the second reaction zone of the riser reactor (not shown in the figure).
The regenerator 5 is connected to the catalyst cooler 8B by the regenerated catalyst transporting pipe 10B, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9B. The temperature of the regenerator 5 is controlled by adjusting the flow rate of the fluidized medium 35B (including air, steam and the like) and/or the flow rate of the rising medium 36B (including air, steam and the like) on the cold regenerated catalyst returning pipe 12B.
The catalyst cooler 8A, 8B are provided with at least one fluidized medium distributor. The fluidized medium enters the catalyst cooler via the bottom distributor of the catalyst cooler, wherein the superficial gas velocity is 0-0.7 m/s (preferably 0.005-0.3 m/s, and most preferably 0.01-0.15 m/s), and the temperature of the cold regenerated catalyst is controlled mainly by adjusting a flow rate of the fluidized medium.
Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
The catalyst cooler may be integral with the regenerator and the riser, and may also be connected thereto by pipeline.
The heavy oil raw material 33 is mixed with the regenerated catalyst that is from the heavy oil riser reactor pre-lift zone 4, enters the first reaction zone 3 of the heavy oil riser reactor, and performs a reaction under the catalytic cracking condition. The main operation conditions are as follows: reaction temperature 400-650° C. (preferably 480-560° C.), reaction pressure 0.11-0.4 MPa, contact time 0.05-5 seconds (preferably 0.1-3 seconds), and the weight ratio of the catalyst to the raw material generally 3-15, and preferably 5-12.
The cold-shocking agent 34 is mixing cooled with the mixture of the reactant oil gas and the catalyst that is from the first reaction zone 3, enters the second reaction zone 2 of the heavy oil riser reactor, to mainly perform secondary reactions such as hydrogen transfer, isomerization and aromatization, to further reduce the contents of olefins and sulfur, to increase the octane value. The main operation conditions are as follows: reaction temperature 350-620° C. (preferably 450-530° C.), reaction pressure 0.11-0.4 MPa, and contact time 0.5-30 seconds (preferably 1-5 seconds).
The mixture of the reactant oil gas and the catalyst that is from the second reaction zone 2 enters the settler 1, and perform the separation of the oil gas and the catalyst. The oil gas enters the fractionation and absorbing-stabilizing system, to perform fractionation and liquefied petroleum gas (LPG) recycling, and obtains products, including catalytic cracking gasoline, and unconverted oil.
The spent catalyst, after being steam stripped by the steam stripping section 1A of the settler 1, enters the charring tank 5A via the spent catalyst transporting pipe 7 and the controlling valve 20, undergoes quick charring in the present of the main air 38A (oxygen-containing gas including air and the like), and is transported upwardly to the regenerator 5 to be further charring regenerated, and secondary air 38B (oxygen-containing gas including air and the like) is supplemented from the bottom of the regenerator 5. The regenerated catalyst is outputted via the bottom of the regenerator 5, and enters the catalyst cooler 8A and the catalyst cooler 8B in two flows, wherein one flow of the cold regenerated catalyst is circularly used after or not after being mixed with the hot regenerated catalyst, and the other flow returns to the regenerator.
The injection point of the gas or liquid cold-shocking agent may be upstream or downstream of the injection point of the cold catalyst, to conveniently control the temperatures of the reaction zones, or to form another reaction zone.
As shown in
The regenerator is provided with 3 inner or outer heat removing equipments, that is, catalyst coolers, which comprise a catalyst inlet, a lower mixing buffering space, an inner heat removing element (including telescope type and coil pipe type) and a lower fluidized medium distributing installation, which are directly (or by pipeline) connected to the regenerator dense phase.
The catalyst cooler 8A is mainly for adjusting the reaction temperature of the first reaction zone of the heavy oil riser, to maintain it at the optimum value. The catalyst cooler 8B is mainly for adjusting the reaction temperature of the gasoline riser, to maintain it at the optimum value. The other catalyst cooler (not shown in the figure) is mainly for adjusting the regenerator temperature, to maintain it at the optimum value.
35A, 35B are the fluidized medium such as air and steam, 36A, 36B are the rising medium such as air and steam, and 37A, 37B are the heat removing medium, including water, steam, air, oil products and the like.
According to the process requirements, any one or two of the three catalyst coolers may be not provided.
When the catalyst cooler mainly for adjusting the regenerator temperature is not provided, the regenerator temperature is controlled by adjusting the flow rate of the fluidized medium 35A, 35B (including air, steam and the like) of the catalyst cooler 8A and/or the catalyst cooler 8B and/or the quantity of the catalyst that returns to the regenerator and/or the thermal balance of the reaction regeneration system.
In order to conveniently control the temperature of the second reaction zone 2 of the heavy oil riser reactor, the cold-shocking agent 34 may be injected into the downstream of the first reaction zone, to conveniently control the temperature of the second reaction zone 2. The cold-shocking agent may be any one of a gas or a liquid (including water, oil products and the like) and a cold catalyst, and may also be two or more of them. The cold catalyst may be any one of a cold regenerated catalyst, a cold spent catalyst and a cold half-regenerated catalyst, and may also be two or more of them. The cold regenerated catalyst, when it is as the cold-shocking agent, may enter the auxiliary riser via the cold regenerated catalyst transporting pipe, and is transported by the pre-lift medium to the second reaction zone of the riser reactor (not shown in the figure).
The regenerator 5 is connected to the catalyst cooler 8A by the regenerated catalyst transporting pipe 10A, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9A. The cold regenerated catalyst is connected to the heavy oil riser reactor pre-lift zone 4 by the cold regenerated catalyst transporting pipe 11A. The temperature of the cold regenerated catalyst that leaves the catalyst cooler 8A is controlled by adjusting the flow rate of the fluidized medium 35A (including air, steam and the like) and/or the flow rate of the rising medium 36A (including air, steam and the like) on the cold regenerated catalyst returning pipe 12A. The controlling valve 21A is a special controlling element that is provided for conveniently controlling the flow rate of the cold regenerated catalyst.
In order to conveniently control the temperature of the first reaction zone of the heavy oil riser reactor, a hot regenerated catalyst transporting pipe (including a controlling valve) that is connect to the heavy oil riser reactor pre-lift zone 4 is provided. The cold regenerated catalyst and the hot regenerated catalyst, after being mixed in the heavy oil riser reactor pre-lift zone 4, raise the temperature by the pre-lift medium 32 (including water, steam, refinery dry gases and the like) to reach the equilibrium. Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
The regenerator 5 is connected to the catalyst cooler 8B by the regenerated catalyst transporting pipe 10B, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9B. The cold regenerated catalyst is connected to a gasoline riser pre-lift zone via the cold regenerated catalyst transporting pipe 11B. The temperature of the cold regenerated catalyst that leaves the catalyst cooler 8B is controlled by adjusting the flow rate of the fluidized medium 35B (including air, steam and the like) and/or the flow rate of the rising medium 36B (including air, steam and the like) on the cold regenerated catalyst returning pipe 12B. The controlling valve 21B is a special controlling element that is provided for conveniently controlling the flow rate of the cold regenerated catalyst.
The catalyst cooler 8A, 8B are provided with at least one fluidized medium distributor. The fluidized medium enters the catalyst cooler via the bottom distributor of the catalyst cooler, wherein the superficial gas velocity is 0-0.7 m/s (preferably 0.005-0.3 m/s, and most preferably 0.01-0.15 m/s), and the temperature of the cold regenerated catalyst is controlled mainly by adjusting a flow rate of the fluidized medium.
In order to conveniently control the temperature of the gasoline riser reactor, the hot regenerated catalyst transporting pipe 19B (including the controlling valve 22B) that is connect to the gasoline riser reactor pre-lift zone 4 is provided. The cold regenerated catalyst and the hot regenerated catalyst, after being mixed in the gasoline riser reactor pre-lift zone 4, raise the temperature by the pre-lift medium 30 (including water, steam, refinery dry gases and the like) to reach the equilibrium. Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
The catalyst cooler may be integral with the regenerator and the riser, and may also be connected thereto by pipeline.
The heavy oil raw material 33 is mixed with the regenerated catalyst that is from the heavy oil riser reactor pre-lift zone 4, after the cooling enters the first reaction zone 3 of the heavy oil riser reactor, and performs a reaction under the catalytic cracking condition. The main operation conditions are as follows: reaction temperature 400-650° C. (preferably 480-560° C.), reaction pressure 0.11-0.4 MPa, contact time 0.05-5 seconds (preferably 0.1-3 seconds), and the weight ratio of the catalyst to the raw material generally 5-15, and preferably 5-12.
The cold-shocking agent 34 is mixing cooled with the mixture of the reactant oil gas and the catalyst that is from the first reaction zone 3, enters the second reaction zone 2 of the heavy oil riser reactor, to mainly perform secondary reactions such as hydrogen transfer, isomerization and aromatization, to further reduce the contents of olefins and sulfur, to increase the octane value. The main operation conditions are as follows: reaction temperature 350-620° C. (preferably 450-530° C.), reaction pressure 0.11-0.4 MPa, and contact time 0.5-30 seconds (preferably 1-5 seconds).
Inferior gasoline 31 is mixed with a regenerated catalyst that is from the gasoline riser pre-lift zone, enters the gasoline riser reactor, contacts under the following conditions: reaction temperature 300-650° C. (preferably 400-500° C.), reaction pressure 0.11-0.4 MPa, contact time 0.5-30 seconds (preferably 1-15 seconds), and the weight ratio of the catalyst to the raw material generally 1-50, and preferably 2-20, to mainly perform gasoline upgrading reactions such as isomerization and aromatization, to reduce the contents of olefins and sulfur, to increase the octane value.
The mixture of the reactant oil gas and the catalyst that is from the second reaction zone 2 enters the settler 1, and performs the separation of the oil gas and the catalyst. The oil gas enters the fractionation and absorbing-stabilizing system singly or after being mixed with the oil gas that is from the settler 18, to perform fractionation and LPG recycling, and obtains products, including catalytic cracking gasoline, and unconverted oil. The spent catalyst, after being steam stripped by the steam stripping section 1A of the settler 1, enters the regenerator 5 via the spent catalyst transporting pipe 7 and the controlling valve (not shown).
The reactant stream that is from the gasoline riser 6 enters the settler 18 to perform the separation of the oil gas and the catalyst, and the oil gas singly enters the fractionation and absorbing-stabilizing system to perform fractionation and LPG recycling, and obtains products including catalytic cracking gasoline; or after being mixed with the oil gas that is from the settler 1, enters the commonly used fractionation and absorbing-stabilizing system to perform fractionation and liquefied petroleum gas (LPG) recycling.
The spent catalyst, after being steam stripped by the steam stripping section 18A of the settler 18, enters the regenerator 5 via the spent catalyst transporting pipe 15 and the controlling valve 23.
The spent catalyst that is from the steam stripping sections of the two settlers enters the regenerator 5, is charring regenerated in the present of the oxygen-containing gas 38 (including air and the like), and enters the catalyst cooler 8A and the catalyst cooler 86 in two flows, wherein the two flows of the cold regenerated catalyst are circularly used after or not after being mixed with the hot regenerated catalyst.
The injection point of the gas or liquid cold-shocking agent may be upstream or downstream of the injection point of the cold catalyst, to conveniently control the temperatures of the reaction zones, or to form another reaction zone.
As shown in
The regenerator is provided with 3 inner or outer heat removing equipments, that is, catalyst coolers, which comprise a catalyst inlet, a lower mixing buffering space, an inner heat removing element (including telescope type and coil pipe type) and a lower fluidized medium distributing installation, which are directly (or by pipeline) connected to the regenerator dense phase.
The catalyst coolers 8A, 8B is mainly for adjusting the reaction temperatures of the first reaction zones of the two heavy oil riser reactors, to maintain them at the optimum values. The other catalyst cooler (not shown in the figure) is mainly for adjusting the regenerator temperature, to maintain it at the optimum value.
35A, 35B are the fluidized medium such as air and steam, 36A, 36B are the rising medium such as air and steam, and 37A, 376 are the heat removing medium, including water, steam, air, oil products and the like.
According to the process requirements, any one or two of the three catalyst coolers may be not provided.
The regenerator 5 is connected to the catalyst cooler 8A by the regenerated catalyst transporting pipe 10A, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9A. The cold regenerated catalyst is connected to the heavy oil riser reactor pre-lift zone 4A by the cold regenerated catalyst transporting pipe 11A. The temperature of the cold regenerated catalyst that leaves the catalyst cooler 8A is controlled by adjusting the flow rate of the fluidized medium 35A (including air, steam and the like) and/or the flow rate of the rising medium 36A (including air, steam and the like) on the cold regenerated catalyst returning pipe 12A. The controlling valve 21A is a special controlling element that is provided for conveniently controlling the flow rate of the cold regenerated catalyst.
The regenerator 5 is connected to the catalyst cooler 8B by the regenerated catalyst transporting pipe 10B, and the regenerated catalyst after being cooled enters the lower mixing buffering space 9B. The cold regenerated catalyst is connected to the heavy oil riser reactor pre-lift zone 4B by the cold regenerated catalyst transporting pipe 11B. The temperature of the cold regenerated catalyst that leaves the catalyst cooler 8A is controlled by adjusting the flow rate of the fluidized medium 35B, including air, steam and the like, and/or the flow rate of the rising medium 366, including air, steam and the like, on the cold regenerated catalyst returning pipe 12B. The controlling valve 21A is a special controlling element that is provided for conveniently controlling the flow rate of the cold regenerated catalyst.
The catalyst cooler 8A, 8B are provided with at least one fluidized medium distributor. The fluidized medium enters the catalyst cooler via the bottom distributor of the catalyst cooler, wherein the superficial gas velocity is 0-0.7 m/s (preferably 0.005-0.3 m/s, and most preferably 0.01-0.15 m/s), and the temperature of the cold regenerated catalyst is controlled mainly by adjusting a flow rate of the fluidized medium.
Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
In order to conveniently control the temperature of the first reaction zone of the two riser reactors, a hot regenerated catalyst transporting pipe (including a controlling valve) (not shown in the figure) that is connect to the heavy oil riser reactor pre-lift zones 4A, 4B may be provided. The cold regenerated catalyst and the hot regenerated catalyst, after being mixed in the heavy oil riser reactor pre-lift zones 4A, 4B, raise the temperature by the pre-lift mediums 32A, 32B (including water, steam, refinery dry gases and the like) to reach the equilibrium. Certainly, there may be many other controlling equipments and controlling methods, and that does not limit any special implementation of the concept of the present invention.
In order to conveniently control the temperature of the second reaction zone 2 of the two riser reactors, the cold-shocking agents 34A, 34B may be injected into the downstream of the first reaction zone, to conveniently control the temperature of the second reaction zone 2. The cold-shocking agent may be any one of a gas or a liquid (including water, oil products and the like) and a cold catalyst, and may also be two or more of them. The cold catalyst may be any one of a cold regenerated catalyst, a cold spent catalyst and a cold half-regenerated catalyst, and may also be two or more of them. The cold regenerated catalyst, when it is as the cold-shocking agent, may enter the auxiliary riser via the cold regenerated catalyst transporting pipe, and is transported by the pre-lift medium to the second reaction zone of the riser reactor (not shown in the figure).
The catalyst cooler may be integral with the regenerator and the riser, and may also be connected thereto by pipeline.
The heavy oil raw material (fresh raw material) 33A is mixed with the regenerated catalyst that is from the heavy oil riser reactor pre-lift zone 4A, enters the first reaction zone 3A of the heavy oil riser reactor, and performs a reaction under the catalytic cracking condition. The main operation conditions are as follows: reaction temperature 400-650° C. (preferably 480-560° C.), reaction pressure 0.11-0.4 MPa, contact time 0.05-5 seconds (preferably 0.1-3 seconds), and the weight ratio of the catalyst to the raw material generally 3-15, and preferably 5-12.
The cold-shocking agent 34A is mixing cooled with the mixture of the reactant oil gas and the catalyst that are from the first reaction zone 3A, enters the second reaction zone 2A of the heavy oil riser reactor, to mainly perform secondary reactions such as hydrogen transfer, isomerization and aromatization, to further reduce the contents of olefins and sulfur, to increase the octane value. The main operation conditions are as follows: reaction temperature 350-620° C. (preferably 450-530° C.), reaction pressure 0.11-0.4 MPa, and contact time 0.5-30 seconds (preferably 1-5 seconds).
The mixture of the reactant oil gas and the catalyst that is from the second reaction zone 2A enters the commonly used settler 1, to perform the separation of the oil gas and the catalyst.
The heavy oil raw material (recycle oil, slurry and the like) 33B is mixed with the regenerated catalyst that is from the heavy oil riser reactor pre-lift zone 4B, enters the first reaction zone 3B of the heavy oil riser reactor, and performs a reaction under the catalytic cracking condition. The main operation conditions are as follows: reaction temperature 400-650° C. (preferably 480-600° C.), reaction pressure 0.11-0.4 MPa, contact time 0.05-5 seconds (preferably 0.1-3 seconds), and the weight ratio of the catalyst to the raw material generally 3-15, and preferably 5-12.
The cold-shocking agent 346 is mixing cooled with the mixture of the reactant oil gas and the catalyst that is from the first reaction zone 3B, enters the second reaction zone 2B of the heavy oil riser reactor, to mainly perform secondary reactions such as hydrogen transfer, isomerization and aromatization, to further reduce the contents of olefins and sulfur, to increase the octane value. The main operation conditions are as follows: reaction temperature 350-620° C. (preferably 450-530° C.), reaction pressure 0.11-0.4 MPa, and contact time 0.5-30 seconds (preferably 1-5 seconds).
The mixture of the reactant oil gas and the catalyst that is from the second reaction zone 2B enters the commonly used settler 1, to perform the separation of the oil gas and the catalyst (the separation installation is not shown).
The mixtures of the oil gas and the catalyst that are from two heavy oil riser reactors are mixed, and perform further separation of the oil gas and the catalyst. The reactant oil gas after the separation enters a commonly used fractionation and absorbing-stabilizing system, to perform fractionation and liquefied petroleum gas (LPG) recycling.
The spent catalysts that are from two heavy oil riser reactors are mixed, enter the steam stripping section 1A of the settler 1, after steam stripping enter the charring tank 5A via the spent catalyst transporting pipe 7 and the controlling valve 20, undergo quick charring in the present of the main air 38A (oxygen-containing gas including air and the like), and are transported upwardly to the regenerator 5 to be further charring regenerated, and secondary air 38B (oxygen-containing gas including air and the like) is supplemented from the bottom of the regenerator 5. The regenerated catalyst is outputted via the bottom of the regenerator 5, and enters the catalyst cooler 8A, the catalyst cooler 8B and the catalyst cooler 8C in 3 flows, wherein one flow of the cold regenerated catalyst is circularly used after or not after being mixed with the hot regenerated catalyst, and the other flows return to the regenerator.
The injection point of the gas or liquid cold-shocking agent may be upstream or downstream of the injection point of the cold catalyst, to conveniently control the temperatures of the reaction zones, or to form another reaction zone.
The present application claims the right of priority of the Chinese Patent Application No. 201510004405.7, which was filed on Jan. 6, 2015, the disclosure of which is hereby incorporated in entirety as part of the present application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201510004405.7 | Jan 2015 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2016/070252 | 1/6/2016 | WO | 00 |
