Patent Application
20210301683
The present invention is related to pressure enhancement systems, and in particular to a pre-booster pumping system for increasing power generation of a turbine of a thermal power plant.
A turbine is a core element for a thermal power plant. The turbine serves to convert thermal power into mechanic power for power generation. In general, the gas drainage side of a turbine is arranged with a condenser. The condenser other than condenses the vapor from the turbine into water for being used by boilers, but it also forms vacuum in the gas drainage place of the turbine. Pipe lines are arranged for connecting the turbine and the condenser. The vacuum of the condenser will affect the power efficiency of the power generator. This is because the pressure vapor will become waste gas (containing vapor) after driving the turbine. The vacuum of the condenser will affect removing efficiency of the waste gas and the efficiency of the turbine work and thus it affects power generation of the power plant.
Currently, the waste gas (vapor) from the turbine is naturally transferred to the condenser by the pressure difference between. Generally, the pressure of the condenser is reduced so that waste gas can flow into the condenser quickly. For some large scale power generators, in some range, if the vacuum is increased 1 KPa, the coal consumption for each Kilowatt-hour is reduced with a value of 3 grams.
Thermal power plants use water as cooling medium, which is derived from natural sources, such as water from rivers, lakes, sea, air, etc. Due to different seasons, the water temperature is affected by the temperatures of air and water. As a result the vacuum of a condenser cannot be retained in the value of original design. That is to say, in most time, the vacuum of the condenser is not the one which is beneficial to decrease the coal consumption of the power generation of the power plant.
In general, a rear end of the condenser is added with a vacuum pumping system, generally the vacuum pumps are large water circulation pumps or the pumps of other form, some are vapor pumping systems, or water jetting pumps. Thus the pumping system serves to form vacuum in the condenser, but the time period is short, generally not over 2 hours. That is to say, it serves to pump non-condensed gas in the condenser. The pumping amount of these pumps may be enlarged. However, this operation cannot effectively increase the vacuum of the condenser due to the amount of vapor in the water gas is very large and the vapor will evaporate with a higher speed in low pressure.
Therefore, the object of the present invention is to provide a novel system which provide a pressure increasing system in front of the condenser so as to promote the power generation efficiency of a turbine in a thermal power plant for resolving above said defect in the prior art.
Accordingly, for improving above mentioned defects in the prior art, the object of the present invention is to provide a pre-booster pumping system for increasing power generation of a turbine of a thermal power plant, wherein the booster pump system are added between the turbine and the condenser. The booster pump system serves to pump wasted gas in the turbine so that the drainage of the gas is enforced instead of naturally draining. The waste gas in the turbine is drained with a high efficiency so that power generation of the power system is promoted. Furthermore the coal consumption of the turbine is recued. As a result the power generation of a power plant is not affected by the environmental temperature, destroy of vacuum, and sizes of vacuum pumps. The power generator may be operated in an optimum state. In the present invention, the booster pumps may be connected serially or in parallel as desired so as to have an optimum removing of the waste gas from the turbine.
To achieve above object, the present invention provides a pre-booster pumping system for increasing power generation of a turbine of a thermal power plant, wherein the turbine has an air draining end; if pressured vapor passes through and driving the turbine, the vapor will lose of dynamics so as to form as waste gas (containing air and vapor) which is drained through the air draining end; the pre-booster pumping system comprising: a booster pump system including an inlet end, an output end and at least one booster pump between the inlet end and the output end; the inlet end of the booster pump system being connected to the air draining end of the turbine through an input tube; each booster pump including an air inlet and an air outlet; the waste gas drained from the air draining end of the turbine being inputted to the booster pump from the inlet end of the booster pump; the vapor pressure being increased in the booster pump and then the vapor being outputted from the output end; and a condenser having an input end; the output end of the booster pump system being connected to the input end of the condenser through the output tube; the condenser serving to receive the waste gas (containing air and vapor) from the booster pump system and cool the waste vapor as water.
In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.
With reference to
A turbine 1 has an air draining end 11. If pressured vapor passes through and driving the turbine 1, the vapor will lose of dynamics so as to form as waste gas (containing air and vapor) which is drained through the air draining end 11. Generally, the turbine 1 is used in a thermal power plant and has power from vapor. The turbine 1 converts thermal energy of the vapor into mechanical works for driving the power generator of the power plant.
A booster pump system 5 includes an inlet end 51, an output end 52 and at least one booster pump 3 between the inlet end 51 and the output end 52. The inlet end 51 of the booster pump system 5 is connected to the air draining end 11 of the turbine 1 through an input tube 21. Each booster pump 3 includes an air inlet 31 and an air outlet 32. The waste gas drained from the air draining end 11 of the turbine 1 is inputted to the booster pump 3 from the inlet end 51 of the booster pump 3. The vapor pressure is increased in the booster pump 3 and then the vapor is outputted from the output end 52. The booster pump 3 may be one of root pumps, centrifugal pumps, jet pumps or air pumps which can pump a large amount of air and can increase air transfer speed therein. Therefore, by the at least one booster pump 3, the waste gas in the turbine 1 may be pumped out so that gas in the turbine 1 is drained enforce.
With reference to
Referring to
With reference to
A condenser 4 has an input end 41. The output end 52 of the booster pump system 5 is connected to the input end 41 of the condenser 4 through the output tube 22. The condenser 4 serves to receive the waste gas (containing air and vapor) from the booster pump system 5 and cool the waste vapor as water. The condenser 4 may be water cooled condensers, air cooled condensers, or other kinds of condensers.
The present invention further includes a vacuuming system 6. An output end of the condenser 4 is connected to the vacuuming system 6 which is used to vacuum the non-condensed gas in the condenser 4 so that internal of the condenser 4 is vacuumed.
With reference to
With reference to
Each output end 31 of each booster pump 3 may be installed with a valve 33 for closing or opening the booster pump 3 as desired so that the booster pump 3 may be isolated from the booster pump system 5 for increasing the reliability and operation ability of the booster pump system 5.
In the present invention, each booster pump 3 is formed with a channel (not shown). Therefore, when one booster pump 3 is stopped, the wasted gas may pass through the stopped booster pump 3 so that the turbine 1 can still be operated. The whole system can be operated safely.
A function block diagram of the booster pump 3 is shown in
The booster pump 3 is connected to a driving device 81. The driving device 81 is connected to a control unit 82. The control unit 82 serves to control the driving device 81 to control the booster pump 3. The control unit 82 controls the driving device 81 by adjustment of frequency so as to adjust the ability of each booster pump 3. The variation of frequency could assure that the booster pumps 3 can be operated safely. Low frequency operation can save power greatly and high frequency operation could present the pressure enhancement ability of the booster pump 3. Therefore, the speed of the booster pump system 5 is controlled so that the system has a preferred vacuum and is not affected by climates.
Each booster pump 3 is connected to a cooling device 91 which serves to input cooling water into the booster pump 3 for cooling.
Each booster pump 3 is arranged with a pressure sensor 92 and a temperature sensor 93. The pressure sensor 92 serves to detect the pressure of the pipes in the booster pump 3. The temperature sensor 93 serves to detect temperatures of the booster pump 3. The detected pressures and temperatures are transferred to the control unit 82 for controlling the driving device 81 and the control unit 82 so as to cause the booster pumps 3 to be operated steadily.
In the present invention, the booster pump system 5 may be fixed by fixing frames (not shown). The detailed is known in the prior art and thus the details will be further described herein.
Advantages of the present invention are that the booster pump system are added between the turbine and the condenser. The booster pump system serves to pump wasted gas in the turbine so that the drainage of the gas is enforced instead of naturally draining. The waste gas in the turbine is drained with a high efficiency so that power generation of the power system is promoted. Furthermore the coal consumption of the turbine is recued. As a result the power generation of a power plant is not affected by the environmental temperature, destroy of vacuum, and sizes of vacuum pumps. The power generator may be operated in an optimum state. In the present invention, the booster pumps may be connected serially or in parallel as desired so as to have an optimum removing of the waste gas from the turbine.
In the prior art, the condenser is installed with mechanical pumps or vapor pumps for increasing vacuum of the condenser, but in the present invention, the booster pump system is installed between the turbine and the condenser, which has the advantages that the condenser is not affected by the temperature of cooling water and drainage of water so that the power generation efficiency is not affected by the climates.
The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
