1. Technical Field
One or more embodiments of the present invention relate to systems and methods for cooling a hydrocarbon-containing stream with a single closed-loop mixed refrigerant cycle.
2. Description of Related Art
Due to the high pressure required to maintain hydrocarbons, such as ethylene, ethane, propane, and propylene, in a liquefied state at ambient temperature, streams of these materials are typically refrigerated to very low temperatures so that the material can be loaded, transported, and/or stored at or near ambient pressure. Conventional systems for cooling hydrocarbon feed streams in this manner utilize propane and/or propylene as a cooling medium, but such refrigerants often lack sufficient refrigeration ability. As a result, many conventional cooling systems require multiple refrigeration cycles, including open-loop refrigeration cycles, and/or high levels of compression, to achieve the desired combination of pressure and temperature in the final product. Not only does this approach result in high operating expenses, but it also increases the capital requirement for such facilities due, in part, to the additional compression equipment and higher pressure rated vessels.
Thus, a need exists for an improved system for refrigerating hydrocarbon streams so that the materials can be transported, loaded, and/or stored at or near atmospheric pressure. Desirably, the system would require a minimal amount of equipment and would also be less expensive to operate than conventional systems. It would also be desirable that the system be capable of processing feeds having a wide range of compositions, including those with higher concentrations of more volatile components, with the optional capability of recovering the lighter components as a separate product stream.
One embodiment of the present invention concerns a method for reducing the pressure of a hydrocarbon-containing stream so as to provide a cooled, reduced-pressure hydrocarbon-containing stream, the method comprising the following steps: (a) cooling the hydrocarbon-containing stream via indirect heat exchange with a mixed refrigerant to provide a warmed refrigerant stream and a cooled stream; (b) flashing at least a portion of the cooled stream to provide a two-phase fluid stream; (c) separating at least a portion of the two-phase fluid stream within a separator vessel into a vapor fraction and a liquid fraction; (d) introducing at least a portion of the liquid fraction into a holding vessel; (e) compressing at least a portion of the separated vapor fraction to provide a compressed vapor stream; (f) condensing at least a portion of the compressed vapor stream to provide a condensed stream; and (g) returning at least a portion of the condensed stream to the separator vessel or the holding vessel.
Another embodiment of the present invention concerns a method for reducing the pressure of a hydrocarbon-containing stream so as to provide a cooled, reduced-pressure hydrocarbon-containing stream, the method comprising: (a) cooling a hydrocarbon-containing stream via indirect heat exchange with a stream of mixed refrigerant to provide a cooled stream and a warmed refrigerant stream; (b) flashing at least a portion of the cooled stream to provide a flashed stream; (c) separating at least a portion of the flashed stream in a first vapor-liquid separator into a first vapor stream and a first liquid stream; (d) introducing at least a portion of the first liquid stream into a holding vessel; (e) compressing at least a portion of the first vapor stream to provide a compressed vapor stream; (f) separating at least a portion of the compressed vapor stream in a fractionation column to provide a light component-rich overhead stream and a light component-depleted bottoms stream; (g) cooling at least a portion of the light component-rich overhead stream to provide a cooled overhead stream; and (h) introducing a liquid portion of the cooled overhead stream into the upper portion of the fractionation column.
Still another embodiment of the present invention concerns a system for providing a cooled, reduced-pressure hydrocarbon-containing stream. The system comprises a primary heat exchanger comprising a first cooling pass for cooling the hydrocarbon-containing stream, wherein the first cooling pass comprises a warm fluid inlet and a cool fluid outlet. The system also comprises a first expansion device comprising a high pressure fluid inlet and a low pressure fluid outlet, wherein the high pressure liquid inlet is in fluid flow communication with the cool fluid outlet of the first cooling pass and a first vapor-liquid separator comprising a first fluid inlet, a first liquid outlet, and a first vapor outlet, wherein the first fluid inlet is in fluid flow communication with the low pressure fluid outlet of the first expansion device. The system further comprises at least one compressor comprising a first low pressure inlet and a first high pressure outlet, wherein the first low pressure inlet is in fluid flow communication with the first vapor outlet of the first vapor-liquid separator and wherein the first high pressure outlet is in fluid flow communication with the first fluid inlet of the first vapor-liquid separator and a holding vessel comprising a fluid inlet and a liquid outlet, wherein the fluid inlet is in fluid flow communication with the first liquid outlet of the first vapor-liquid separator.
The system also comprises a closed-loop mixed refrigeration cycle that comprises a refrigerant cooling pass disposed in the primary heat exchanger, wherein the refrigerant cooling pass has a warm refrigerant inlet and a cool refrigerant outlet and a refrigerant warming pass disposed in the primary heat exchanger, wherein the refrigerant warming pass has a cool refrigerant inlet and a warm refrigerant outlet. The cycle also comprises a refrigerant expansion device comprising a high pressure refrigerant inlet and a low pressure refrigerant outlet, wherein the high pressure refrigerant inlet is in fluid flow communication with the cool refrigerant outlet of the refrigerant cooling pass and the low pressure refrigerant outlet is in fluid flow communication with the cool refrigerant inlet of the refrigerant warming pass and a refrigerant compressor having a low pressure refrigerant inlet and a high pressure refrigerant outlet. The low pressure refrigerant inlet is in fluid flow communication with the warm refrigerant outlet of the refrigerant warming pass and the high pressure refrigerant outlet is in fluid flow communication with the warm refrigerant inlet of the refrigerant cooling pass.
Various embodiments of the present invention are described in detail below with reference to the attached drawing Figures, wherein:
The following detailed description of embodiments of the invention references the accompanying drawings. The embodiments are intended to describe aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention. Another embodiment can be utilized and changes can be made without departing from the scope of the claims. Additionally, it should be understood that references in the specification to “one embodiment,” “an embodiment,” or “other embodiment,” and similar phrases mean that a particular feature, structure, or characteristic described in connection with the phrase is included in at least one embodiment of the invention. Features, structures, and characteristics described with respect to one embodiment are not necessarily limited to that embodiment and may be equally applied to any other embodiment, unless specifically described otherwise. The following detailed description is, therefore, not to be taken in a limiting sense. The scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled.
The present invention generally relates to processes and systems for cooling and reducing the pressure of a hydrocarbon-containing fluid stream so that the stream can be processed, stored, and/or transported at or near atmospheric pressure. In particular, the present invention relates to optimized refrigeration processes and systems for cooling and depressurizing an incoming feed stream using a closed-loop refrigeration system that employs a single mixed refrigerant. According to various embodiments of the present invention, the refrigeration system may be optimized to provide efficient cooling for the feed stream, while minimizing the expenses associated with the equipment and operating costs of the facility.
Turning initially to
As shown in
The hydrocarbon-containing stream in conduit 150 can be any fluid stream that includes one or more hydrocarbon components. In one embodiment, the stream in conduit 150 can include at least about 50 volume percent, at least about 60 volume percent, at least about 70 volume percent, at least about 80 volume percent, or at least about 90 volume percent of one or more hydrocarbon components, including, for example, C2 to C6 hydrocarbon components. As used herein, the general term “Cx” refers to a hydrocarbon component comprising x carbon atoms per molecule and, unless otherwise noted, is intended to include all paraffinic and olefinic isomers thereof. Thus, “C2” is intended to encompass both ethane and ethylene, while “C5” is intended to encompass isopentane, normal pentane and all C5 branched isomers, as well as C5 olefins and diolefins. As used herein, the term “Cx and heavier” refers to hydrocarbons having x or more carbon atoms per molecule (including paraffinic and olefinic isomers), while the term “Cx and lighter” refers to hydrocarbons having x or less carbon atoms per molecule (including paraffinic and olefinic isomers).
According to one embodiment, the hydrocarbon-containing stream in conduit 150 can include at least about 70 volume percent, at least about 85 volume percent, or at least about 95 volume percent of C2 and heavier components, based on the total volume of the stream. In some embodiments, the hydrocarbon-containing stream in conduit 150 can include less than about 10 volume percent, less than about 5 volume percent, less than about 2 volume percent, or less than about 1 volume percent C1 and lighter components, while, in another embodiment, the amount of C1 and lighter components in the hydrocarbon-containing stream in conduit 150 can be at least about 1 volume percent, at least about 2 volume percent, at least about 3 volume percent and/or not more than about 10 volume percent, not more than about 8 volume percent, or not more than about 5 volume percent, based on the total volume of the stream. In one embodiment, the stream in conduit 150 can include less than about 30 volume percent, less than about 15 volume percent, or less than about 5 volume percent of C3 and heavier components.
The hydrocarbon-containing stream in conduit 150 can originate from any suitable source (not shown), such as another processing zone or a separation unit, or it may originate from a storage facility, pipeline, or production zone. In one embodiment, the hydrocarbon-containing stream in conduit 150 may be subjected to one or more pretreatment steps in a pretreatment zone (not shown) before being introduced into primary heat exchanger 16 of refrigeration system 110, as shown in
The temperature of the hydrocarbon-containing stream in conduit 150 can be at least about 60° F., at least about 80° F., at least about 100° F. and/or not more than about 200° F., not more than about 175° F., not more than about 150° F. The pressure of the hydrocarbon-containing stream can vary, depending on the composition of the stream, but can be, for example, in the range of from about 450 psig, at least about 650 psig, at least about 850 psig and/or not more than about 2000 psig, not more than about 1750 psig, or not more than about 1500 psig.
As shown in
As the hydrocarbon-containing feed stream passes through cooling pass 18 of primary heat exchanger 16, the stream may be cooled via indirect heat exchange with a yet-to-be-discussed stream of mixed refrigerant. In one embodiment, the feed stream in conduit 150 can be cooled by at least about 125° F., at least about 175° F., at least about 200° F. as it passes through cooling pass 18. The resulting cooled stream withdrawn from primary heat exchanger 16 in conduit 152 can have a temperature of at least about −50° F., at least about −80° F., at least about −130° F. and/or not more than about −10° F., not more than about −25° F., not more than about −40° F. The vapor fraction of the stream in conduit 152 can be less than about 0.005, less than about 0.001, or it can be 0.
As shown in
As shown in
The lower pressure zone or holding vessel can be any suitable vessel or space configured to hold the liquefied product stream in conduit 160 for at least some length of time and it can be stationary, mobile, or semi-mobile. In some embodiments, a portion of the liquefied product stream can be transferred from the holding vessel to another holding or transportation vessel (not shown) via conduit 120. In one embodiment, the lower pressure zone or holding vessel can be a storage tank (e.g., storage tank 26 shown in
As shown in
In one embodiment depicted in
According to one embodiment illustrated in
As shown in
As shown in
Turning now to the refrigeration portion of refrigeration facility 110 depicted in
As shown in
Referring again to
The resulting two-phase refrigerant stream in conduit 186 can then be introduced into interstage separator 46, wherein the vapor and liquid portions can be separated. A vapor stream withdrawn from separator 46 via conduit 190 can be routed to the inlet of the second (high pressure) stage of refrigerant compressor 42, wherein the stream can be further compressed. The resulting compressed refrigerant vapor stream in conduit 192, which can have a pressure of at least about 150, at least about 200, or at least about 250 psig and/or less than about 600, less than about 550, less than about 500 can be recombined with a portion of the liquid phase refrigerant withdrawn from interstage separator 144 in conduit 188 and pumped to a higher pressure via refrigerant pump 48, as shown in
The resulting combined two-phase refrigerant stream can then be introduced into refrigerant condenser 50, wherein the pressurized fluid stream can be cooled and at least partially condensed via indirect heat exchange with a cooling medium (e.g., cooling water) before being introduced into refrigerant separator 52 via conduit 194. As shown in
As it flows through refrigerant cooling pass 56, the stream of mixed refrigerant can be condensed and sub-cooled, such that the temperature of the liquid refrigerant stream withdrawn from primary heat exchanger 16 via conduit 176 can be well below the bubble point of the refrigerant mixture. The sub-cooled refrigerant stream in conduit 176 can then be expanded via passage through a refrigerant expansion device 58 (illustrated in
According to one embodiment of the present invention, it may be desirable to adjust the composition of the mixed refrigerant to thereby alter its cooling curve and, therefore, its refrigeration potential. Such a modification may be utilized to accommodate, for example, changes in composition and/or flow rate of the feed stream introduced into the refrigeration facility. In one embodiment, the composition of the mixed refrigerant can be adjusted such that the heating curve of the vaporizing refrigerant more closely matches the cooling curve of the feed stream. One method for such curve matching is described in detail, with respect to an LNG facility, in U.S. Pat. No. 4,033,735, incorporated herein by reference to the extent not inconsistent with the present disclosure.
Referring now to
In one embodiment, the refrigeration facility 110 shown in
Turning initially to the cooled fluid stream exiting primary heat exchanger 16 via conduit 152 shown in
As shown in
In a similar manner as described with respect to
In the embodiment depicted in
As shown in
Referring now to
Turning initially to vapor-liquid separation vessel 22, a vapor phase stream withdrawn from separation vessel 22 via conduit 164 can be routed to a first low pressure inlet of one of the compressors, shown in
According to one embodiment, fractionation column 212 can be operable to separate a feed stream into a light component-enriched overhead stream, withdrawn from an upper vapor outlet of column 212, and a light component-depleted bottoms stream withdrawn from a lower liquid outlet of column 212. In one embodiment, fractionation column 212 may be configured to separate C1 and lighter components from a fluid stream and can, for example, be configured to separate at least 65, at least 75, at least 85, at least 90, or at least 99 percent of the C1 and lighter components from the pressurized fluid stream in conduit 166.
Fractionation column 212 can comprise any suitable type of vapor-liquid separation vessel and, although shown in
According to in one embodiment depicted in
As shown in
As shown in
As shown in
As shown in
Turning now to
Turning to
As shown in
According to the embodiment depicted in
Turning now to the embodiment of closed-loop refrigeration cycle 14 depicted in
Similarly, the second and third refrigerant portions in respective conduits 174b and 174c respectively pass through a refrigerant cooling pass 56b and 56c contained within heat exchangers 116 and 16. The cooled refrigerant streams in respective conduits 176b and 176c may then be expanded via passage through separate expansion devices, shown as expansion valves 58b and 58c, before being routed to refrigerant warming passes 60b and 60c, as discussed previously. The resulting warmed refrigerant streams exiting warming passes 60b and 60c via conduit 180b and 180c can be combined with the warmed refrigerant stream in conduit 180a and passed via conduit 181 through refrigeration cycle 14 as previously described.
Referring now to
Turning initially to vapor-liquid separator 216 shown in
As shown in
The following example is for purposes of illustration only and is not intended to be unnecessarily limiting.
Computer simulations of several different refrigeration facilities were performed using ASPEN® HYSYS process modeling software (available from Aspen Technology, Inc.) and are summarized in Tables 2 and 3. Two of the simulated facilities, Comparative Facility A and Comparative Facility B, included open-loop cascade refrigeration systems for cooling a feed stream. The other four facilities modeled for this Example, Inventive Facilities 1-4, included a single closed-loop mixed refrigerant system for cooling the incoming fluid stream. Schematic diagrams of each of Inventive Facilities 1-3 are provided in
Turning first to the Comparative Facility A depicted in
In addition to propylene refrigeration cycle 512, at least a portion of the cooling of the feed stream in conduit 550 is carried out using an open-loop refrigeration cycle that employs a portion of the cooled feed. In particular, as shown in
Turning now to
The liquid bottoms stream withdrawn from fractionation column 570 is cooled in heat exchanger 516 of propylene refrigeration cycle 512 and passes through the remainder of Comparative Facility B in a similar manner as discussed in detail previously with respect to Comparative Facility A illustrated in
Each of Comparative Facilities A and B and Inventive Facilities 1-4 described above was simulated twice—once with a high methane content feed stream (e.g., 3.0 volume percent methane) and once with a lower methane content feed stream (e.g., 1.0 volume percent methane). The results of each simulation, including the composition of the liquid C2 product and the methane off-gas product, if present, are provided in Table 2 (High Methane Content) and Table 3 (Lower Methane Content) below. Additionally, Tables 2 and 3 provide the overall net power requirements for each simulation.
Additionally,
The higher efficiency of embodiments of the present invention can result in lower annual operating expenses and lower capital investment due to the reduced total compression requirement, as indicated in Tables 2 and 3. Additional capital investment savings and reduced facility footprint can also result from the reduced equipment count, as compared to the conventional technology as shown in
The preferred forms of the invention described above are to be used as illustration only and should not be used in a limiting sense to interpret the scope of the present invention. Obvious modifications to the exemplary embodiments, set forth above, could be readily made by those skilled in the art without departing from the spirit of the present invention. The inventors hereby state their intent to rely on the Doctrine of Equivalents to determine and assess the reasonably fair scope of the present invention as pertains to any apparatus not materially departing from but outside the literal scope of the invention as set forth in the following claims.
This application claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application Ser. No. 61/904,895, filed on Nov. 15, 2013, and U.S. Provisional Application Ser. No. 61/928,244, filed on Jan. 16, 2014, both of which are incorporated herein by reference to the extent not inconsistent with the present disclosure.
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