Integrated compressed air energy storage and thermal power co-generation system and operation method

Abstract

The application discloses a heat and electricity collaborative system integrated with compressed air energy storage and an operation method thereof. The system comprises an extraction condensing unit, a steam ejector, a compressor unit, a compressed cooler unit, an expansion unit, an expansion heater unit, an air storage chamber, an electric motor, a generator, a high back pressure unit, a heating condenser and various pipelines and valves. In the energy storage stage in the heating season, the compressor unit consumes electric energy and stores high-pressure air in the air storage chamber, and the multi-stage compression heat is used for assisting the heat supply of a heat supply network. In the energy release stage in the heating season, the air storage chamber releases the high-pressure air and drives the generator to generate electricity in the expansion unit, and the water of the heat supply network is used as a multi-stage heating heat source required in the expansion process. Meanwhile, the return water of the heat supply network is heated in stages, and the high back pressure unit steam turbine part exhaust steam, the extraction condensing unit steam turbine extraction steam and the steam turbine exhaust steam are used as heat sources in sequence. The application realizes the efficient integration of the compressed air energy storage and the heat and electricity unit, and the energy efficiency level and the peak regulation capacity of the system are obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combined heat and power, power station peak shaving and compressed air energy storage, and in particular to a combined heat and power system integrated with compressed air energy storage and an operation method thereof. BACKGROUND

[0002] Solar energy, wind energy and other new energy generation have strong volatility and anti-peak shaving characteristics. The increase in the proportion of new energy generation on the grid brings great challenges to power grid peak shaving. With the rapid development of China's clean energy industry, the consumption of new energy generation is still severe, and phenomena such as wind curtailment and light curtailment are widespread. At present, China's thermal power capacity is surplus, and the annual utilization hours of power generation equipment are low. In the future, continuous low-load operation or deep peak shaving operation of thermal power units will become a common practice. Combined heat and power units have a large proportion and high capacity in thermal power generation, and improving the deep peak shaving capacity of combined heat and power units is a key technology for the consumption of renewable energy generation. The current deep peak shaving technology of conventional combined heat and power units has the following problems:

[0003] (1) The energy utilization level of electric boilers and bypass main steam peak shaving methods is low. In order to improve the heating capacity of the unit during the heat peak period, the energy efficiency of the unit will be reduced.

[0004] (2) The existing combined heat and power peak shaving system has the problems of insufficient flexibility in parameter adjustment and insufficient flexibility in selection of heat source steam. Conventional unit peak shaving technology faces the problems of low energy utilization efficiency and small peak shaving depth. SUMMARY

[0005] In order to solve the problems existing in the prior art, the purpose of the present application is to provide a combined heat and power system integrated with compressed air energy storage and an operation method thereof. During the energy storage period in the heating season, the compressor unit consumes electric energy and stores high-pressure air in the air storage chamber. The multi-stage compression heat is used for auxiliary heating of the heat network. During the energy release period in the heating season, the air storage chamber releases high-pressure air and does work in the expander unit to drive the generator to generate electricity. The heat network water is used as the multi-stage heating heat source required in the expansion process. At the same time, the return water of the heat network is heated in stages, and the high back pressure unit turbine low pressure cylinder partial exhaust steam, the extraction condensing unit turbine extraction steam and the extraction steam turbine low pressure cylinder exhaust steam are used in turn as heat sources. The present application realizes the efficient integration of compressed air energy storage and combined heat and power units, and the energy efficiency and peak shaving capacity of the system are significantly improved. The present application realizes the flexible and rapid switching of the working mode of the power station system during the peak-low (energy storage-energy release) period, and realizes the orderly utilization of energy in the peak shaving process. The energy utilization efficiency is high, the peak shaving depth is large, and the parameter adjustment is flexible.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0007] The utility model provides a kind of integrated compressed air energy storage's thermal power collaborative system, including sequentially connected boiler 101 main steam side, extraction condensing unit high pressure cylinder 102, boiler 101 reheat steam side, extraction condensing unit medium pressure cylinder 103 and extraction condensing unit low pressure cylinder 104;Extraction condensing unit high pressure cylinder 102 exhaust pipe and first stage regenerative extraction pipe are communicated, and by control valve door alpha 111 with the injection steam side of ejector 113 is communicated;Second stage extraction, third stage extraction and fourth stage extraction pipe of communication extraction condensing unit medium pressure cylinder 103 pressure are sequentially communicated with the injection steam side of ejector 113 by control valve door beta 110, control valve door gamma 109 and control valve door delta 108 respectively;Third stage extraction pipe and deaerator 112 are communicated;Extraction condensing unit low pressure cylinder 104 exhaust pipe is communicated with the steam side of ejector 113 by regulating valve door alpha 106;The outlet of ejector 113 is sequentially communicated with the shell side of heat network heater 107 and deaerator 112;High back pressure unit low pressure cylinder 201 exhaust pipe is sequentially communicated with three-way regulating valve he 202, air cooling condenser 203 and back pressure unit backwater system, three-way regulating valve he 202 is sequentially communicated with heat supply condenser 204 shell side, air cooling condenser 203 by pipeline;Heat network backwater is divided into two ways after passing through regulating valve door beta 415, one way is sequentially communicated with heat supply condenser 204 pipe side, heat network heater 107 pipe side, regulating valve door gamma 313 and heat network water supply pipeline by pipeline, another way is sequentially communicated with control valve door xi 416 and the outlet of variable frequency water pump alpha 319 by pipeline;Variable frequency water pump alpha 319 inlet is communicated with the pipe side outlet of expansion heater alpha 305, expansion heater beta 306, expansion heater gamma 307 and expansion heater delta 308 respectively by pipeline;The pipe side inlet of expansion heater alpha 305, expansion heater beta 306 and expansion heater gamma 307 is communicated with three-way regulating valve alpha 315, three-way regulating valve beta 316 and three-way regulating valve gamma 317 respectively by pipeline;The pipe side inlet of expansion heater delta 308 is sequentially communicated with three-way regulating valve gamma 317, three-way regulating valve beta 316, three-way regulating valve alpha 315, control valve door p 314, regulating valve door gamma 313 and heat network water supply pipeline;Heat network backwater pipeline is also communicated with the pipe side inlet of compression cooler alpha 406, compression cooler beta 407, compression cooler gamma 408 and compression cooler delta 409 respectively by control valve door kan 414;The pipe side outlet of compression cooler alpha 406, compression cooler beta 407 and compression cooler gamma 408 is communicated with three-way regulating valve delta 411, three-way regulating valve xi 412 and three-way regulating valve xi 413 respectively;The pipe side outlet of compression cooler delta 409 is sequentially communicated with three-way regulating valve xi 413, three-way regulating valve xi 412, three-way regulating valve delta 411, variable frequency water pump beta 418, control valve door he 318 and heat network heater 107 pipe side outlet;The environmental air pipeline is sequentially connected with the shell side of the compression cooler D 409, the compressor D 405, the shell side of the compression cooler C 408, the compressor C 404, the shell side of the compression cooler B 407, the compressor B 403, the shell side of the compression cooler A 406, the compressor A 402, the control valve J 410, the gas storage chamber 312, the control valve I 311, the throttle valve 310, the shell side of the expansion heater D 308, the expander D 304, the shell side of the expansion heater C 307, the expander C 303, the shell side of the expansion heater B 306, the expander B 302, the shell side of the expansion heater A 305, the expander A 301, and an expander set exhaust pipeline; the compressor A 402, the compressor B 403, the compressor C 404, and the compressor D 405 are respectively connected with the rotating shaft of the motor 401 through a mechanical shaft; the expander A 301, the expander B 302, the expander C 303, and the expander D 304 are sequentially connected with the rotating shaft of the generator 309 through a mechanical shaft; the high-pressure cylinder 102, the medium-pressure cylinder 103, and the low-pressure cylinder 104 of the extraction condensing unit are sequentially connected with the rotating shaft of the generator 105 of the extraction condensing unit through a mechanical shaft; the generator 205 of the high-back pressure unit is connected with the low-pressure cylinder 201 of the high-back pressure unit through a mechanical shaft; and the generator 205 of the high-back pressure unit is sequentially connected with the switch 417 and the motor 401 through an electric circuit.

[0008] The operation method of the integrated compressed air energy storage thermal power cooperative system is as follows: in the energy storage stage in the heating season, the expander set and the expansion heater are not operated, and the compressor set and the compression cooler are operated, so that the high-pressure air is stored in the gas storage chamber 312; the control valve I 311, the control valve E 314, the control valve G 416, and the variable frequency water pump A 319 are closed, the switch 417 is closed, the control valve H 318, the control valve I 414, the control valve J 410, and the variable frequency water pump B 418 are opened; the variable frequency water pump B 418 is adjusted to make the working medium in the pipeline flow from the variable frequency water pump B 418 to the heat supply pipeline, the total flow of the working medium flowing through the variable frequency water pump B 418 is adjusted, so that the temperature difference between the outlet working medium of each compression cooler and the heat supply water is controlled within a preset temperature difference; the three-way regulating valve D 411, the three-way regulating valve E 412, and the three-way regulating valve G 413 are adjusted to control the temperature difference between the outlet working medium of the compression cooler A 406, the compression cooler B 407, the compression cooler C 408, and the compression cooler D 409 within a preset temperature difference.

[0009] The operation method of the heat and power synergistic system with integrated compressed air energy storage is as follows during the energy release phase in the heating season: the expansion unit and the expansion heater are working, while the compressor unit and the compression cooler are not working, and high-pressure air is released from the air storage chamber 312; the control valve Ren 311, the control valve Wu 314, the control valve Ji 416 and the variable frequency water pump A 319 are opened, the switch 417 is disconnected, the control valve Geng 318, the control valve Xin 414, the control valve Gui 410 and the variable frequency water pump B 418 are closed; and the variable frequency water pump A 319 is adjusted. 19 enables the working fluid in the pipeline to flow from the variable frequency water pump A 319 to the pipe side of the heating condenser 204, and adjusts the total flow rate of the working fluid flowing through the variable frequency water pump A 319 so that the temperature difference between the working fluid at the pipe side outlet of each expansion heater and the return water temperature of the heat network is controlled within a preset temperature difference; adjusts the three-way regulating valve A 315, the three-way regulating valve B 316 and the three-way regulating valve C 317 so that the temperature difference between the working fluid at the pipe side outlet of the expansion heater A 305, the expansion heater B 306, the expansion heater C 307 and the expansion heater D 308 is controlled within a preset temperature difference.

[0010] The operating method of the described heat-power coordinated system with integrated compressed air energy storage, when operating in the energy storage and release stages of the heating season: flexibly select the induced steam parameters of the ejector 113 according to the heat load, that is, according to the change of the heat load of the water supply of the heating network from maximum to minimum, divide the heat load into four levels, and respectively use and only use the first-stage extraction steam of the condensing unit turbine, that is, open the control valve A 111, the second-stage extraction steam, that is, open the control valve B 110, the third-stage extraction steam, that is, open the control valve C 109, and the fourth-stage extraction steam, that is, open the control valve D 108 as the induced steam of the ejector 113; within each heat load level, adjust the opening of the regulating valve A 106 and the opening of the induced steam pipeline valve according to the induced steam parameters of the ejector 113, and adjust the outlet flow distribution ratio of the three-way regulating valve G 202 according to the size of the heat load, so that the water supply temperature of the heating network is maintained within the required range.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] (1) The return water of the heating network adopts high back pressure unit exhaust steam and ejector cascade heating to achieve orderly cascade utilization of energy.

[0013] (2) The extraction and condensing type steam turbine is used to extract steam from the low-pressure cylinder to exhaust steam, which fully realizes the recovery and utilization of waste heat and improves the energy efficiency of the system.

[0014] (3) Through the complementary exchange of heat and power flows between the compressed air energy storage system and the thermal power units, and the use of steam ejectors to achieve high-quality heat value-added, the energy efficiency level and operational flexibility of the extraction condensing and high back pressure cogeneration units in the heating season are improved.

[0015] (4) The present invention improves the flexible switching speed of the working mode of the cogeneration system during the peak and valley periods in the heating season, has a large peak regulation depth, and is flexible in parameter adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a thermoelectric synergistic system with integrated compressed air energy storage and its operating method according to the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In order to achieve efficient and flexible coupling of compressed air energy storage technology and cogeneration units, the present invention provides a heat and power synergy system with integrated compressed air energy storage, such as Figure 1As shown, the system comprises, in sequence, a boiler 101 main steam side, an extraction condensing unit high-pressure cylinder 102, a boiler 101 reheat steam side, an extraction condensing unit intermediate-pressure cylinder 103, and an extraction condensing unit low-pressure cylinder 104; the extraction condensing unit high-pressure cylinder 102 exhaust pipe is connected in communication with the first-stage regenerative extraction steam pipe, and is connected in communication with the injection steam side of the ejector 113 through a control valve A 111; the second-stage extraction steam pipe, the third-stage extraction steam pipe, and the fourth-stage extraction steam pipe, which are connected in communication with the extraction condensing unit intermediate-pressure cylinder 103 in sequence, are connected in communication with the injection steam side of the ejector 113 through a control valve B 110, a control valve C 109, and a control valve D 108, respectively; the third-stage extraction steam pipe is connected in communication with the deaerator 112; the extraction condensing unit low-pressure cylinder 104 exhaust pipe is connected in communication with the suction steam side of the ejector 113 through an adjusting valve A 106; the outlet of the ejector 113 is connected in communication with the shell side of the heat network heater 107 and the deaerator 112 in sequence; the low-pressure cylinder 201 exhaust pipe of the high-back-pressure unit is connected in communication with a three-way regulating valve G 202, an air-cooled condenser 203, and a back-pressure unit backwater system in sequence; the three-way regulating valve G 202 is connected in communication with the shell side of a heating condenser 204 and the air-cooled condenser 203 in sequence through a pipe; the heat network backwater is divided into two routes after passing through an adjusting valve B 415, one of which is connected in communication with the tube side of the heating condenser 204, the tube side of the heat network heater 107, an adjusting valve C 313, and a heat network water supply pipe in sequence through a pipe, and the other of which is connected in communication with a control valve G 416 and the outlet of a variable frequency water pump A 319 through a pipe; the inlet of the variable frequency water pump A 319 is connected in communication with the tube side outlet of an expansion heater A 305, an expansion heater B 306, an expansion heater C 307, and an expansion heater D 308 through a pipe, respectively; the tube side inlets of the expansion heater A 305, the expansion heater B 306, and the expansion heater C 307 are connected in communication with a three-way regulating valve A 315, a three-way regulating valve B 316, and a three-way regulating valve C 317 through a pipe, respectively; the tube side inlet of the expansion heater D 308 is connected in communication with the three-way regulating valve C 317, the three-way regulating valve B 316, the three-way regulating valve A 315, a control valve E 314, the adjusting valve C 313, and the heat network water supply pipe in sequence; the heat network backwater pipe is also connected in communication with the tube side inlets of a compression cooler A 406, a compression cooler B 407, a compression cooler C 408, and a compression cooler D 409 through a control valve H 414, respectively; the tube side outlets of the compression cooler A 406, the compression cooler B 407, and the compression cooler C 408 are connected in communication with a three-way regulating valve D 411, a three-way regulating valve E 412, and a three-way regulating valve G 413, respectively; the tube side outlet of the compression cooler D 409 is connected in communication with the three-way regulating valve G 413, the three-way regulating valve E 412, the three-way regulating valve D 411, a variable frequency water pump B 418, a control valve G 318, and the tube side outlet of the heat network heater 107 in sequence;The environmental air pipeline is connected with the shell side of the compression cooler D 409, the compressor D 405, the shell side of the compression cooler C 408, the compressor C 404, the shell side of the compression cooler B 407, the compressor B 403, the shell side of the compression cooler A 406, the compressor A 402, the control valve J 410, the gas storage chamber 312, the control valve I 311, the throttle valve 310, the shell side of the expansion heater D 308, the expander D 304, the shell side of the expansion heater C 307, the expander C 303, the shell side of the expansion heater B 306, the expander B 302, the shell side of the expansion heater A 305, the expander A 301 and the expander set exhaust pipeline in sequence; the compressor A 402, the compressor B 403, the compressor C 404 and the compressor D 405 are connected with the rotating shaft of the motor 401 through mechanical shafts respectively; the expander A 301, the expander B 302, the expander C 303 and the expander D 304 are connected with the rotating shaft of the generator 309 through mechanical shafts in sequence; the high-pressure cylinder 102, the medium-pressure cylinder 103 and the low-pressure cylinder 104 of the extraction condensing unit are connected with the rotating shaft of the generator 105 of the extraction condensing unit through mechanical shafts in sequence; the generator 205 of the high-back pressure unit is connected with the low-pressure cylinder 201 of the high-back pressure unit through a mechanical shaft; the generator 205 of the high-back pressure unit is connected with the switch 417 and the motor 401 through an electric circuit in sequence. According to the system configuration of the application, the system can realize the step-by-step and orderly use of energy by the step-by-step heating of the heat network return water through the exhaust steam of the high-back pressure unit and the ejector.

[0019] In order to develop the economic and flexible potential of the integrated compressed air energy storage and thermal power system more scientifically and effectively, the system is operated in the following manner in the energy storage stage in the heating season: the expander set and the expansion heater are not working, and the compressor set and the compression cooler are working, so that the high-pressure air is stored in the air storage chamber 312; the control valve ren 311 is closed to block the air flow from the air storage chamber 312 to the expander set; the control valve pent 314 and the control valve hex 416 are closed to make the working medium in the pipelines not flow; the variable frequency water pump a 319 is closed to make the working medium not flow in the pipeline; the switch 417 is closed to make the electric motor work, the control valve hept 318 and the control valve oct 414 are opened to make the working medium water flow through each compression cooler; the control valve dec 410 is opened to make the high-pressure air flow from the compressor set to the air storage chamber 312; the variable frequency water pump b 418 is opened, the flow direction of the working medium flowing through the water pump is adjusted by the variable frequency water pump b 418, so that the working medium in the pipeline flows to the heat supply pipeline by the variable frequency water pump b 418, the total flow of the working medium flowing through the variable frequency water pump b 418 is adjusted, so that the temperature difference between the outlet working medium of each compression cooler and the heat supply water is controlled within 3°C; the opening degrees of the three-way regulating valve but 411, the three-way regulating valve pent 412 and the three-way regulating valve hex 413 are adjusted, so as to reasonably distribute the hot water flow of the outlet pipeline of the three-way valve, and make the temperature difference between the outlet working medium of the compression cooler a 406, the compression cooler b 407, the compression cooler c 408 and the compression cooler d 409 and the heat supply water be controlled within 3°C respectively. The low-pressure cylinder exhaust steam is injected by the extraction steam of the extraction turbine, so that the waste heat recovery of the system can be fully realized, thereby improving the energy efficiency of the system.

[0020] The operation method of the integrated compressed air energy storage thermal power collaborative system releases energy in the heating season in the following manner: the expander set and the expansion heater work, while the compressor set and the compression cooler do not work, and high-pressure air is released from the air storage chamber 312; the control valve 311 is opened, so that the high-pressure air in the air storage chamber 312 flows to the expander set; the control valve 314, the control valve 416 and the variable frequency water pump 319 are opened, so that the working medium in the pipelines connected to the valves flows; the switch 417 is disconnected, so that the electric motor 401 does not work; the control valve 318 and the control valve 414 are closed, so that the working medium in the pipelines connected to the valves does not flow; the control valve 410 is closed, so that the pipeline through which air flows from the compressor set to the air storage chamber 312 is blocked; the variable frequency water pump 418 is closed; the variable frequency water pump 319 is adjusted to control the flow direction of the working medium in the pipeline connected to the variable frequency water pump 319, so that the working medium in the pipeline connected to the variable frequency water pump 319 flows to the heating condenser 204 from the variable frequency water pump 319; the total flow of the working medium flowing through the variable frequency water pump 319 is adjusted, so that the temperature difference between the outlet working medium of each expansion heater and the return water of the heating network is controlled to be within 3 DEG C; the opening degrees of the three-way regulating valve 315, the three-way regulating valve 316 and the three-way regulating valve 317 are adjusted, so that the hot water flow in the outlet pipelines of the three-way valves is reasonably distributed, and the temperature difference between the outlet working medium of the expansion heater 305, the expansion heater 306, the expansion heater 307 and the expansion heater 308 and the return water of the heating network is controlled to be within 3 DEG C. The present application realizes the complementary exchange between the compressed air energy storage system and the thermal and electric energy flow of the thermal power unit, and realizes the high-grade heat value-added by using the steam ejector, so that the energy efficiency level and the operation flexibility of the extraction condensing type and high back pressure type combined heat and power unit in the heating season are improved.

[0021] The operation method of the integrated compressed air energy storage thermal power collaborative system releases energy in the heating season in the following manner: the operation method and the system configuration are reasonably matched, so that the flexible switching speed of the working mode of the thermal power unit in the peak period and the valley period in the heating season is realized, the peak shaving depth is large, and the parameter adjustment is flexible.

Claims

1. An integrated compressed air energy storage and cogeneration system, comprising a boiler (101) main steam side, an extraction condensing unit high pressure cylinder (102), a boiler (101) reheat steam side, an extraction condensing unit medium pressure cylinder (103) and an extraction condensing unit low pressure cylinder (104) connected in sequence; the extraction condensing unit high pressure cylinder (102) exhaust pipe is connected with the first stage regenerative extraction steam pipe and connected with the injection steam side of the ejector (113) through the control valve A (111); the second stage extraction steam pipe, the third stage extraction steam pipe and the fourth stage extraction steam pipe of the extraction condensing unit medium pressure cylinder (103) connected in sequence are connected with the injection steam side of the ejector (113) through the control valve B (110), the control valve C (109) and the control valve D (108) respectively; the third stage extraction steam pipe is connected with the deaerator (112); the extraction condensing unit low pressure cylinder (104) exhaust pipe is connected with the injected steam side of the ejector (113) through the regulating valve A (106); the outlet of the ejector (113) is connected with the shell side of the heat network heater (107) and the deaerator (112) in sequence; the extraction condensing unit low pressure cylinder (201) exhaust pipe is connected with the three-way regulating valve G (202), the air cooling condenser (203) and the back pressure unit backwater system in sequence; the three-way regulating valve G (202) is connected with the shell side of the heat supply condenser (204) and the air cooling condenser (203) in sequence through the pipe; the heat network backwater is divided into two ways after passing through the regulating valve B (415), one way is connected with the pipe side of the heat supply condenser (204), the pipe side of the heat network heater (107), the regulating valve C (313) and the heat network water supply pipe in sequence through the pipe, the other way is connected with the control valve F (416) and the outlet of the variable frequency water pump A (319) through the pipe; the inlet of the variable frequency water pump A (319) is connected with the pipe side outlet of the expansion heater A (305), the expansion heater B (306), the expansion heater C (307) and the expansion heater D (308) through the pipe respectively; the pipe side inlets of the expansion heater A (305), the expansion heater B (306) and the expansion heater C (307) are connected with the three-way regulating valve A (315), the three-way regulating valve B (316) and the three-way regulating valve C (317) through the pipe respectively; the pipe side inlet of the expansion heater D (308) is connected with the three-way regulating valve C (317), the three-way regulating valve B (316), the three-way regulating valve A (315), the control valve E (314), the regulating valve C (313) and the heat network water supply pipe in sequence; the heat network backwater pipe is connected with the pipe side inlets of the compression cooler A (406), the compression cooler B (407), the compression cooler C (408) and the compression cooler D (409) through the control valve H (414) respectively; the pipe side outlets of the compression cooler A (406), the compression cooler B (407) and the compression cooler C (408) are connected with the three-way regulating valve D (411), the three-way regulating valve E (412) and the three-way regulating valve F (413) respectively.The pipe side outlet of the compression cooler D (409) is communicated with the three-way regulating valve E (413), the three-way regulating valve D (412), the three-way regulating valve C (411), the variable frequency water pump B (418), the control valve G (318) and the pipe side outlet of the heat network heater (107) in sequence. The ambient air pipeline is communicated with the shell side of the compression cooler D (409), the compressor D (405), the shell side of the compression cooler C (408), the compressor C (404), the shell side of the compression cooler B (407), the compressor B (403), the shell side of the compression cooler A (406), the compressor A (402), the control valve J (410), the gas storage chamber (312), the control valve I (311), the throttle valve (310), the shell side of the expansion heater D (308), the expander D (304), the shell side of the expansion heater C (307), the expander C (303), the shell side of the expansion heater B (306), the expander B (302), the shell side of the expansion heater A (305), the expander A (301) and the expander set exhaust pipeline in sequence. The compressor A (402), the compressor B (403), the compressor C (404) and the compressor D (405) are connected with the rotating shaft of the motor (401) through mechanical shafts respectively. The expander A (301), the expander B (302), the expander C (303) and the expander D (304) are connected with the rotating shaft of the generator (309) through mechanical shafts in sequence. The high-pressure cylinder (102), the medium-pressure cylinder (103) and the low-pressure cylinder (104) of the extraction condensing unit are connected with the rotating shaft of the generator (105) of the extraction condensing unit through mechanical shafts in sequence. The generator (205) of the high back pressure unit is connected with the low-pressure cylinder (201) of the high back pressure unit through a mechanical shaft. The generator (205) of the high back pressure unit is connected with the switch (417) and the motor (401) through an electric circuit in sequence.

2. The method for operating an integrated compressed air energy storage cogeneration system of claim 1, wherein: The heating season energy storage stage is operated as follows: the expander set and the expansion heater are not operated, and the compressor set and the compression cooler are operated, so that the high-pressure air is stored in the air storage chamber (312); the control valve (311), the control valve (314), the control valve (416) and the variable frequency water pump (319) are closed, the switch (417) is closed, and the control valve (318), the control valve (414), the control valve (410) and the variable frequency water pump (418) are opened; the variable frequency water pump (418) is adjusted so that the working medium in the pipeline flows from the variable frequency water pump (418) to the heat supply water pipeline, and the total flow of the working medium flowing through the variable frequency water pump (418) is adjusted, so that the temperature difference between the working medium at the outlet of the compression cooler and the heat supply water is controlled within a preset temperature difference; the three-way regulating valve (411), the three-way regulating valve (412) and the three-way regulating valve (413) are adjusted respectively, so that the temperature difference between the working medium at the outlet of the compression cooler and the heat supply water is controlled within a preset temperature difference; The heating season energy storage stage is operated as follows: the expander set and the expansion heater are not operated, and the compressor set and the compression cooler are operated, so that the high-pressure air is stored in the air storage chamber (312); the control valve (311), the control valve (314), the control valve (416) and the variable frequency water pump (319) are closed, the switch (417) is closed, and the control valve (318), the control valve (414), the control valve (410) and the variable frequency water pump (418) are opened; the variable frequency water pump (418) is adjusted so that the working medium in the pipeline flows from the variable frequency water pump (418) to the heat supply water pipeline, and the total flow of the working medium flowing through the variable frequency water pump (418) is adjusted, so that the temperature difference between the working medium at the outlet of the compression cooler and the heat supply water is controlled within a preset temperature difference; the three-way regulating valve (411), the three-way regulating valve (412) and the three-way regulating valve (413) are adjusted respectively, so that the temperature difference between the working medium at the outlet of the compression cooler and the heat supply water is controlled within a preset temperature difference; 3. The method for operating an integrated compressed air energy storage thermal power cogeneration system according to claim 2, wherein: In the energy storage and release phase of the heating season, the injection steam parameters of the ejector (113) are flexibly selected according to the heat load, that is, according to the change of the heat load of the heat supply water from the maximum to the minimum, the heat load is divided into four levels, and the first stage extraction steam of the extraction condensing unit turbine, that is, the control valve A (111) is opened, the second stage extraction steam, that is, the control valve B (110) is opened, the third stage extraction steam, that is, the control valve C (109) is opened, and the fourth stage extraction steam, that is, the control valve D (108) is opened, are sequentially and only used as the injection steam of the ejector (113); in each heat load level, the opening of the adjusting valve A (106) and the opening of the injection steam pipeline valve are adjusted according to the injection steam parameters of the ejector (113), and the outlet flow distribution proportion of the three-way adjusting valve G (202) is adjusted according to the heat load, so that the heat supply water temperature is kept within the required range.

Images