Coal-fired cogeneration system integrated with heat pump heat storage system and operation method of coal-fired cogeneration system

Abstract

The invention provides a coal-fired combined heat and power generation system integrated with a heat pump heat storage system and an operation method of the coal-fired combined heat and power generation system, and belongs to the technical field of coal-fired power generation. According to the combined heat and power generation system, the electricity-to-heat conversion system and the heat storage system are integrated on a traditional combined heat and power generation system, heat supply network water serves as a heat source of a cold source heat exchanger in the electricity-to-heat conversion system, and the COP (coefficient of performance) of the electricity-to-heat conversion system is improved. And then the heat supply network water is heated through the steam ejector to make up lost heat, and finally the heat supply network water is heated to the specified temperature through exhaust steam of the medium-pressure cylinder. The heat stored in the heat tank is used for partially or completely replacing the high-temperature heat regenerator, so that the flow of steam entering the medium-pressure cylinder to do work is increased, and the heat supply amount and the power generation amount of the combined heat and power generation system are increased. Compared with a traditional Carnot battery system, the system has higher back-and-forth efficiency and flexibility, and meanwhile energy utilization is more sufficient.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal-fired power generation, and in particular relates to a coal-fired heat and power cogeneration system with an integrated heat pump thermal storage system and an operation method thereof. Background Art

[0002] Since new energy sources, mainly wind and solar, are random and volatile, incorporating a high proportion of new energy into the power grid will have a great impact on the stability of the power grid system. To solve the above problems, Carnot batteries, as a low-cost, highly adaptable energy storage technology, have begun to attract the attention of many scholars.

[0003] The Carnot battery consists of three systems: an electric-to-heat system, a heat storage system, and a heat-to-electric system. During the energy storage process of the Carnot battery, the working fluid in the low-temperature working fluid tank is heated by electric heating equipment through heat pumps, electric boilers and other technologies, and then stored in a high-temperature working fluid tank; during the energy release process, a variety of heat engine cycles such as the Brayton cycle, Rankine cycle, and organic Rankine cycle can be used to achieve the conversion of thermal energy into electrical energy. It can be seen that the Carnot battery is not constrained by geographical and geological conditions, the cost is controllable, and it can be flexibly adjusted and matched according to the thermodynamic cycle in which it is located. Therefore, it is considered to be a high-efficiency, low-cost, and large-scale energy storage technology comparable to fossil energy in the future.

[0004] According to existing relevant literature, when the heat-to-electricity system of the Carnot battery is a typical Rankine cycle cogeneration unit, its energy release stage is mostly a solution to replace the boiler, without considering replacing other parts of the cogeneration unit. In addition, the low COP (coefficient of performance) of the electric heat-to-heat system in the Carnot battery system will also limit the round-trip efficiency of the entire system. Summary of the invention

[0005] In view of the shortcomings of the existing methods, the present invention proposes a coal-fired cogeneration system with an integrated heat pump thermal storage system and its operation method. According to the energy level characteristics of the high-temperature regenerator part of the cogeneration, the storage tank temperature is reasonably set, and molten salt heating is used instead of high-pressure cylinder extraction heating to achieve the purpose of replacing the high-pressure regenerator, thereby increasing the system's steam mass flow entering the medium-pressure cylinder to do work, and improving power generation and heat supply. At the same time, the return water of the heat network is used as the low-temperature heat source of the electric heat conversion system to improve the system's COP.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A coal-fired heat and power cogeneration system with an integrated heat pump thermal storage system, comprising a steam turbine and a heat recovery module thereof, a heat network water heating module and a storage tank heat storage and release module, wherein the steam turbine and the heat recovery module thereof comprise a boiler, wherein the reheater outlet of the boiler is connected to the inlet of an intermediate pressure cylinder, the outlet of the intermediate pressure cylinder is connected to the inlet of a second diverter valve, the outlet of the second diverter valve is connected to the inlet of a fourth diverter valve, the heat network water heating module comprises a cold source heat exchanger, the heat source outlet of the cold source heat exchanger is connected to the cold source inlet of a first peak heater, the cold source outlet of the first peak heater is connected to the cold source inlet of a second peak heater, the outlet of the fourth diverter valve is connected to the heat source inlet of the second peak heater, and the storage tank heat storage and release module comprises a compressor, the inlet of the compressor is connected to the cold source outlet of the heat regenerator, and the outlet of the cold source heat exchanger is connected to the cold source inlet of the heat regenerator.

[0008] Furthermore, the steam turbine and its heat recovery module also include a high-pressure cylinder, the superheater outlet of the boiler is connected to the inlet of the high-pressure cylinder, the first-stage heat recovery extraction outlet and the second-stage heat recovery extraction outlet of the high-pressure cylinder are respectively connected to the heat source inlets of the first high-temperature regenerator and the second high-temperature regenerator, the high-pressure cylinder outlet is connected to the reheater inlet of the boiler, the first-stage heat recovery extraction port of the intermediate-pressure cylinder is connected to the heat source inlet of the third high-temperature regenerator, the outlet of the intermediate-pressure cylinder is also connected to the steam inlet of the deaerator, the outlet of the second diverter valve is also connected to the inlet of the low-pressure cylinder, the first to fourth-stage heat recovery extraction ports of the low-pressure cylinder are respectively connected to the heat source inlets of the first low-temperature regenerator, the second low-temperature regenerator, the third low-temperature regenerator and the fourth low-temperature regenerator, the outlet of the low-pressure cylinder is connected to the inlet of the third diverter valve, the outlet of the third diverter valve is respectively connected to the inlet of the steam ejector and the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the condensate pump.

[0009] Furthermore, the outlet of the condensate pump is connected to the cold source inlet of the fourth low-temperature regenerator, the cold source outlet of the fourth low-temperature regenerator is connected to the cold source inlet of the third low-temperature regenerator, the heat source outlet of the fourth low-temperature regenerator is connected to the hot well of the condenser, the cold source outlet of the third low-temperature regenerator is connected to the cold source inlet of the second low-temperature regenerator, the heat source outlet of the third low-temperature regenerator is connected to the hot side condensation bypass inlet of the fourth low-temperature regenerator, the cold source outlet of the second low-temperature regenerator is connected to the cold source outlet of the first low-temperature regenerator, the heat source outlet of the second low-temperature regenerator is connected to the hot side condensation bypass inlet of the third low-temperature regenerator, the cold source outlet of the first low-temperature regenerator is connected to the inlet of the deaerator, and the heat source outlet of the first low-temperature regenerator is connected to the heat well of the second low-temperature regenerator. The outlet of the deaerator is connected to the inlet of the feed water pump, the outlet of the feed water pump is connected to the inlet of the first diverter valve, the outlet of the first diverter valve is respectively connected to the cold source inlet of the third high temperature regenerator and the cold source inlet of the heat exchanger, the cold source outlet of the third high temperature regenerator is connected to the cold source inlet of the second high temperature regenerator, the heat source outlet of the third high temperature regenerator is connected to the second inlet of the deaerator, the cold source outlet of the second high temperature regenerator is connected to the cold source inlet of the first high temperature regenerator, the inlet of the first mixing valve is respectively connected to the cold source outlet of the first high temperature regenerator and the cold source outlet of the heat exchanger, the heat source outlet of the first high temperature regenerator is connected to the hot side condensation bypass inlet of the second high temperature regenerator, and the outlet of the first mixing valve is connected to the feed water inlet of the boiler.

[0010] Furthermore, the heat source inlet of the cold source heat exchanger is connected to the return water of the heating network, the cold source outlet of the second peak heater is connected to the water supply port of the heating network, the outlet of the fourth diverter valve is also connected to the driving steam inlet of the steam ejector, the outlet of the steam ejector is connected to the heat source inlet of the first peak heater, the inlet of the second mixing valve is respectively connected to the heat source outlet of the first peak heater and the heat source outlet of the second peak heater, and the outlet of the second mixing valve is connected to the hot well of the condenser.

[0011] Further, the outlet of the compressor is connected to the heat source inlet of the heat source heat exchanger, the heat source outlet of the heat source heat exchanger is connected to the heat source inlet of the regenerator, the heat source outlet of the regenerator is connected to the inlet of a small steam turbine, the outlet of the small steam turbine is connected to the cold source inlet of the cold source heat exchanger, the cold source inlet of the heat source heater is connected to the outlet of the first circulating pump, the cold source outlet of the heat source heater is connected to the inlet of the first throttle valve, the outlet of the first throttle valve is connected to the inlet of the hot tank, the outlet of the hot tank is connected to the inlet of the second circulating pump, the outlet of the second circulating pump is connected to the heat source inlet of the heat exchanger, the heat source outlet of the heat exchanger is connected to the inlet of the second throttle valve, the outlet of the second throttle valve is connected to the inlet of the cold tank, and the outlet of the cold tank is connected to the inlet of the first circulating pump.

[0012] Furthermore, the hot tank temperature is set to 400°C, and the cold tank temperature is set to 200°C.

[0013] Furthermore, in the tank heat storage and release module, the power of the compressor is provided by the abandoned power of the small steam turbine and the new energy station, and the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the generator are coaxially connected.

[0014] Furthermore, in the storage tank heat storage and release module, the mass flow rate diverted by the first diverter valve is determined by the mass flow rate of the circulating medium in the hot tank.

[0015] Furthermore, in the storage tank heat storage and release module, the heat storage medium in the storage tank includes heat transfer oil, and the circulating working fluid compressed by the compressor includes argon and carbon dioxide.

[0016] An operation method of a coal-fired cogeneration system with an integrated heat pump thermal storage system, applicable to a coal-fired cogeneration system with an integrated heat pump thermal storage system as claimed in claim 5, the system can be switched to a heat storage state or a heat release state; when the system is in the heat storage state, the return water of the heat network first releases heat in the cold source heat exchanger, and then is heated in sequence by the first peak heater supplied with steam through the steam ejector and the second peak heater supplied with steam directly through the medium pressure cylinder to reach the heat network water supply temperature; the heat storage medium flows out of the cold tank, enters the hot tank after being heated by high-temperature and high-pressure gas in the heat source heat exchanger, and the high-pressure and medium-temperature gas passes through the return water in sequence. The heat storage medium passes through the heat exchanger and the small steam turbine to become low-temperature and low-pressure gas, and then passes through the cold source heat exchanger and the regenerator to become medium-temperature and low-pressure gas after being heated; when the system is in a heat release state; the heat storage medium enters the heat exchanger from the hot tank after being pressurized by the second circulating pump to heat the feed water from the outlet of the feed water pump to reach the boiler feed water temperature. After the heating is completed, the heat storage medium enters the cold tank after being decompressed by the second throttle valve, and the return water of the hot network is heated by the first peak heater and the second peak heater in turn to reach the hot network water supply temperature, and the steam sources of the first peak heater and the second peak heater are the same as when the system is in a heat storage state.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention sets the corresponding storage tank temperature according to the energy level characteristics of the high-temperature regenerator part in the cogeneration system, and uses molten salt heating instead of high-pressure cylinder extraction heating, thereby increasing the steam mass flow entering the medium-pressure cylinder to do work, and improving the power generation and heat supply. The return water of the heat network is used as the low-temperature heat source of the electric heat conversion system to improve the COP of the system. Finally, the exhaust steam of the low-pressure cylinder is used by the steam ejector to compensate for the loss of the return water capacity of the heat network while increasing the energy utilization rate, and the round-trip efficiency of the entire system is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a coal-fired cogeneration system with an integrated heat pump thermal storage system according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the thermal storage mode system of the storage tank of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the storage tank heat release mode system of the present invention.

[0022] Among them, 1-compressor, 2-regenerator, 3-cold source heat exchanger, 4-small steam turbine, 5-heat source heat exchanger, 6-first throttle valve, 7-first circulating pump, 8-hot tank, 9-cold tank, 10-second circulating pump, 11-heat exchanger, 12-second throttle valve, 13-boiler, 14-first mixing valve, 15-first high-temperature regenerator, 16-second high-temperature regenerator, 17-third high-temperature regenerator, 18-first diverter valve, 19-high-pressure cylinder, 20-supply Water pump, 21-medium pressure cylinder, 22-deaerator, 23-second diverter valve, 24-first low-temperature regenerator, 25-second low-temperature regenerator, 26-third low-temperature regenerator, 27-fourth low-temperature regenerator, 28-low-pressure cylinder, 29-third diverter valve, 30-condenser, 31-condensate pump, 32-fourth diverter valve, 33-steam ejector, 34-second mixing valve, 35-generator, 36-first peak heater, 37-second peak heater. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "top", "side", "far", "near", "inside" and "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms such as "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] See also Figure 1-3The coal-fired cogeneration system with integrated heat pump thermal storage system shown in the figure consists of a steam turbine and its heat recovery module, a heat network water heating module, and a storage tank storage and release module.

[0028] The steam turbine and its reheat module include a boiler 13, the superheater outlet of the boiler 13 is connected to the inlet of the high-pressure cylinder 19, the first-stage reheat extraction outlet of the high-pressure cylinder 19 is connected to the heat source inlet of the first high-temperature reheater 15, the second-stage reheat extraction outlet of the high-pressure cylinder 19 is connected to the heat source inlet of the second high-temperature reheater 16, and the outlet of the high-pressure cylinder 19 is connected to the reheater inlet of the boiler 13. The reheater outlet of the boiler 13 is connected to the inlet of the intermediate-pressure cylinder 21, the first-stage reheat extraction port of the intermediate-pressure cylinder 21 is connected to the heat source inlet of the third high-temperature reheater 17, and the outlet of the intermediate-pressure cylinder 21 is respectively connected to the steam inlet of the deaerator 22 and the inlet of the second diverter valve 23. The outlet of the second diverter valve 23 is respectively connected to the inlet of the fourth diverter valve 32 and the inlet of the low-pressure cylinder 28. The first stage heat recovery steam extraction port of the low pressure cylinder 28 is connected to the heat source inlet of the first low temperature regenerator 24, the second stage heat recovery steam extraction port of the low pressure cylinder 28 is connected to the heat source inlet of the second low temperature regenerator 25, the third stage heat recovery steam extraction port of the low pressure cylinder 28 is connected to the heat source inlet of the third low temperature regenerator 26, the fourth stage heat recovery steam extraction port of the low pressure cylinder 28 is connected to the heat source inlet of the fourth low temperature regenerator 27, the outlet of the low pressure cylinder 28 is connected to the inlet of the third diverter valve 29, the outlet of the third diverter valve 29 is respectively connected to the inlet of the steam ejector 33 and the inlet of the condenser 30. The outlet of the condenser 30 is connected to the inlet of the condensate pump 31, the outlet of the condensate pump 31 is connected to the cold source inlet of the fourth low temperature regenerator 27, the cold source outlet of the fourth low temperature regenerator 27 is connected to the cold source inlet of the third low temperature regenerator 26, and the heat source outlet of the fourth low temperature regenerator 27 is connected to the hot well of the condenser 30. The cold source outlet of the third low-temperature regenerator 26 is connected to the cold source inlet of the second low-temperature regenerator 25, the heat source outlet of the third low-temperature regenerator 26 is connected to the hot side condensation bypass inlet of the fourth low-temperature regenerator 27, the cold source outlet of the second low-temperature regenerator 25 is connected to the cold source outlet of the first low-temperature regenerator 24, and the heat source outlet of the second low-temperature regenerator 25 is connected to the hot side condensation bypass inlet of the third low-temperature regenerator 26. The cold source outlet of the first low-temperature regenerator 24 is connected to the inlet of the deaerator 22, and the heat source outlet of the first low-temperature regenerator 24 is connected to the hot side condensation bypass inlet of the second low-temperature regenerator 25. The outlet of the deaerator 22 is connected to the inlet of the feed water pump 20, and the outlet of the feed water pump 20 is connected to the inlet of the first diverter valve 18.The outlet of the first diverter valve 18 is connected to the cold source inlet of the third high temperature regenerator 17 and the cold source inlet of the heat exchanger 11 respectively, the cold source outlet of the third high temperature regenerator 17 is connected to the cold source inlet of the second high temperature regenerator 16, the heat source outlet of the third high temperature regenerator 17 is connected to the second inlet of the deaerator 22, the cold source outlet of the second high temperature regenerator 16 is connected to the cold source inlet of the first high temperature regenerator 15, the inlet of the first mixing valve 14 is connected to the cold source outlet of the first high temperature regenerator 15 and the cold source outlet of the heat exchanger 11 respectively, the heat source outlet of the first high temperature regenerator 15 is connected to the hot side condensation bypass inlet of the second high temperature regenerator 16, and the outlet of the first mixing valve 14 is connected to the feed water inlet of the boiler 13. The high pressure cylinder 19, the medium pressure cylinder 21, the low pressure cylinder 28 and the generator 35 are coaxially connected.

[0029] The heating network water heating module includes a cold source heat exchanger 3, the heat source inlet of the cold source heat exchanger 3 is connected to the heat network return pipeline, the heat source outlet of the cold source heat exchanger 3 is connected to the cold source inlet of the first peak heater 36, the cold source outlet of the first peak heater 36 is connected to the cold source inlet of the second peak heater 37, the cold source outlet of the second peak heater 37 is connected to the heat network water supply port, the outlet of the fourth diverter valve 32 is respectively connected to the driving steam inlet of the steam ejector 33 and the heat source inlet of the second peak heater 37, the outlet of the steam ejector 33 is connected to the heat source inlet of the first peak heater 36, the inlet of the second mixing valve 34 is respectively connected to the heat source outlet of the first peak heater 36 and the heat source outlet of the second peak heater 37, and the outlet of the second mixing valve 34 is connected to the hot well of the condenser 30.

[0030] The storage tank heat storage and release module includes a compressor 1, the inlet of the compressor 1 is connected to the cold source outlet of the regenerator 2, and the outlet of the compressor 1 is connected to the heat source inlet of the heat source heat exchanger 5. The heat source outlet of the heat source heat exchanger 5 is connected to the heat source inlet of the regenerator 2, the heat source outlet of the regenerator 2 is connected to the inlet of the small steam engine 4, the outlet of the small steam engine 4 is connected to the cold source inlet of the cold source heat exchanger 3, and the outlet of the cold source heat exchanger 3 is connected to the cold source inlet of the regenerator 2. The cold source inlet of the heat source heater 5 is connected to the outlet of the first circulating pump 7, the cold source outlet of the heat source heater 5 is connected to the inlet of the first throttle valve 6, the outlet of the first throttle valve 6 is connected to the inlet of the hot tank 8, the outlet of the hot tank 8 is connected to the inlet of the second circulating pump 10, the outlet of the second circulating pump 10 is connected to the heat source inlet of the heat exchanger 11, the heat source outlet of the heat exchanger 11 is connected to the inlet of the second throttle valve 12, the outlet of the second throttle valve 12 is connected to the inlet of the cold tank 9, the outlet of the cold tank 9 is connected to the inlet of the first circulating pump 7, the temperature of the hot tank 8 is set to 400°C, and the temperature of the cold tank 9 is 200°C. In the storage tank heat storage and release module, the power of the compressor 1 is provided by the abandoned power of the small steam turbine 4 and the new energy station, and the mass flow rate diverted by the first diverter valve 18 is determined by the mass flow rate of the circulating medium in the hot tank 8.

[0031] In the storage tank heat storage and release module, the heat storage medium in the storage tank includes heat transfer oil, and the circulating working fluid compressed by the compressor 1 includes argon and carbon dioxide.

[0032] When in the heat release state, the return water from the heating network directly passes through the steam ejector 33 and extracts the exhaust steam from the intermediate pressure cylinder 21 to reach the water supply temperature of the heating network.

[0033] Example 2

[0034] A method for operating a coal-fired cogeneration system integrated with a heat pump thermal storage system is applicable to the coal-fired cogeneration system provided in Example 1.

[0035] The system can be switched to a heat storage state or a heat release state; when the system is in the heat storage state, the exhaust gas of the intermediate pressure cylinder 21 flows into the steam ejector 33 and the second peak heater 37 through the fourth diverter valve 32, and the steam flowing into the steam ejector 33 flows to the first peak heater 36. The return water of the heating network enters the cold source heat exchanger 3 for heat exchange, and then passes through the first peak heater 36 and the second peak heater 37 in turn for heating, and is used as the heating network water supply after being heated to the specified temperature. The heat transfer oil flows out of the cold tank 9, and enters the hot tank 8 after being heated by the high-temperature and high-pressure gas in the heat source heat exchanger 5; the high-pressure and medium-temperature gas passes through the regenerator 2 and the small steam turbine 4 in turn to become low-temperature and low-pressure gas, and then passes through the cold source heat exchanger 3 and the regenerator 2 to become medium-temperature and low-pressure gas.

[0036] When the system is in the heat release state, the heat transfer oil enters the heat exchanger 11 from the hot tank 8 after being pressurized by the second circulation pump 10 to heat the feed water from the outlet of the feed water pump 20 to make it reach the feed water temperature of the boiler 13. After the heating is completed, the heat transfer oil enters the cold tank 9 after being depressurized by the second throttle valve 12. The return water of the heating network is heated by the first peak heater 36 and the second peak heater 37 in sequence, and is used as the water supply of the heating network after being heated to the specified temperature. In the same system heat storage state, the steam in the first peak heater 36 is obtained by the exhaust of the intermediate pressure cylinder 21 and the steam ejector 33, and the steam in the second peak heater 37 is directly supplied by the exhaust of the intermediate pressure cylinder 21 through the fourth diverter valve 32.

[0037] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention, which are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification, improvement, other modification or equivalent replacement made to the technical solution of the present invention by ordinary technicians in this field, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be included in the protection scope of the present invention.

Claims

1. A coal-fired heat and power cogeneration system with an integrated heat pump thermal storage system, characterized in that: The invention comprises a steam turbine and a heat recovery module, a heat network water heating module and a storage tank heat storage and release module, wherein the steam turbine and the heat recovery module comprise a boiler (13), the reheater outlet of the boiler (13) is connected to the inlet of an intermediate pressure cylinder (21), the outlet of the intermediate pressure cylinder (21) is connected to the inlet of a second diverter valve (23), the outlet of the second diverter valve (23) is connected to the inlet of a fourth diverter valve (32), the heat network water heating module comprises a cold source heat exchanger (3), the heat source outlet of the cold source heat exchanger (3) is connected to the inlet of a second diverter valve (23), and the heat source outlet of the cold source heat exchanger (3) is connected to the inlet of a fourth diverter valve (32). The inlet of the first peak heater (36) is connected to the cold source inlet of the first peak heater (36), the cold source outlet of the first peak heater (36) is connected to the cold source inlet of the second peak heater (37), the outlet of the fourth diverter valve (32) is connected to the heat source inlet of the second peak heater (37), the storage tank heat storage and release module comprises a compressor (1), the inlet of the compressor (1) is connected to the cold source outlet of the regenerator (2), and the outlet of the cold source heat exchanger (3) is connected to the cold source inlet of the regenerator (2).

2. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 1, characterized in that: The steam turbine and the heat recovery module thereof further include a high-pressure cylinder (19), the superheater outlet of the boiler (13) is connected to the inlet of the high-pressure cylinder (19), the first-stage heat recovery steam extraction outlet and the second-stage heat recovery steam extraction outlet of the high-pressure cylinder (19) are respectively connected to the heat source inlets of the first high-temperature reheater (15) and the second high-temperature reheater (16), the outlet of the high-pressure cylinder (19) is connected to the reheater inlet of the boiler (13), the first-stage heat recovery steam extraction port of the intermediate-pressure cylinder (21) is connected to the heat source inlet of the third high-temperature reheater (17), and the outlet of the intermediate-pressure cylinder (21) is also connected to the steam inlet of the deaerator (22). The outlet of the second diverter valve (23) is also connected to the inlet of the low-pressure cylinder (28). The first to fourth stage heat recovery extraction ports of the low-pressure cylinder (28) are respectively connected to the heat source inlets of the first low-temperature regenerator (24), the second low-temperature regenerator (25), the third low-temperature regenerator (26) and the fourth low-temperature regenerator (27). The outlet of the low-pressure cylinder (28) is connected to the inlet of the third diverter valve (29). The outlet of the third diverter valve (29) is respectively connected to the inlet of the steam ejector (33) and the inlet of the condenser (30). The outlet of the condenser (30) is connected to the inlet of the condensate pump (31).

3. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 2, characterized in that: The outlet of the condensate pump (31) is connected to the cold source inlet of the fourth low-temperature heat exchanger (27), the cold source outlet of the fourth low-temperature heat exchanger (27) is connected to the cold source inlet of the third low-temperature heat exchanger (26), the heat source outlet of the fourth low-temperature heat exchanger (27) is connected to the hot well of the condenser (30), the cold source outlet of the third low-temperature heat exchanger (26) is connected to the cold source inlet of the second low-temperature heat exchanger (25), the heat source outlet of the third low-temperature heat exchanger (26) is connected to the heat well of the fourth low-temperature heat exchanger (27), and the heat source outlet of the fourth low-temperature heat exchanger (27) is connected to the hot well of the condenser (30). The hot side condensation bypass inlet of the regenerator (27) is connected, the cold source outlet of the second low-temperature regenerator (25) is connected to the cold source outlet of the first low-temperature regenerator (24), the heat source outlet of the second low-temperature regenerator (25) is connected to the hot side condensation bypass inlet of the third low-temperature regenerator (26), the cold source outlet of the first low-temperature regenerator (24) is connected to the inlet of the deaerator (22), the heat source outlet of the first low-temperature regenerator (24) is connected to the hot side condensation bypass inlet of the second low-temperature regenerator (25) The outlet of the deaerator (22) is connected to the inlet of the water supply pump (20), the outlet of the water supply pump (20) is connected to the inlet of the first diverter valve (18), the outlet of the first diverter valve (18) is respectively connected to the cold source inlet of the third high-temperature regenerator (17) and the cold source inlet of the heat exchanger (11), the cold source outlet of the third high-temperature regenerator (17) is connected to the cold source inlet of the second high-temperature regenerator (16), the heat source outlet of the third high-temperature regenerator (17) is connected to the deaerator (2 2), the cold source outlet of the second high-temperature regenerator (16) is connected to the cold source inlet of the first high-temperature regenerator (15), the inlet of the first mixing valve (14) is respectively connected to the cold source outlet of the first high-temperature regenerator (15) and the cold source outlet of the heat exchanger (11), the hot source outlet of the first high-temperature regenerator (15) is connected to the hot side condensation bypass inlet of the second high-temperature regenerator (16), and the outlet of the first mixing valve (14) is connected to the feed water inlet of the boiler (13).

4. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 3, characterized in that: The heat source inlet of the cold source heat exchanger (3) is connected to the return water of the heating network, the cold source outlet of the second peak heater (37) is connected to the water supply port of the heating network, the outlet of the fourth diverter valve (32) is also connected to the driving steam inlet of the steam ejector (33), the outlet of the steam ejector (33) is connected to the heat source inlet of the first peak heater (36), the inlet of the second mixing valve (34) is respectively connected to the heat source outlet of the first peak heater (36) and the heat source outlet of the second peak heater (37), and the outlet of the second mixing valve (34) is connected to the hot well of the condenser (30).

5. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 4, characterized in that: The outlet of the compressor (1) is connected to the heat source inlet of the heat source heat exchanger (5), the heat source outlet of the heat source heat exchanger (5) is connected to the heat source inlet of the regenerator (2), the heat source outlet of the regenerator (2) is connected to the inlet of the small steam engine (4), the outlet of the small steam engine (4) is connected to the cold source inlet of the cold source heat exchanger (3), the cold source inlet of the heat source heater (5) is connected to the outlet of the first circulating pump (7), the cold source outlet of the heat source heater (5) is connected to the outlet of the first throttle valve (6), and the heat source outlet of the heat source heater (5) is connected to the outlet of the first circulating pump (7). The inlet of the first throttle valve (6) is connected, the outlet of the first throttle valve (6) is connected to the inlet of the hot tank (8), the outlet of the hot tank (8) is connected to the inlet of the second circulation pump (10), the outlet of the second circulation pump (10) is connected to the heat source inlet of the heat exchanger (11), the heat source outlet of the heat exchanger (11) is connected to the inlet of the second throttle valve (12), the outlet of the second throttle valve (12) is connected to the inlet of the cold tank (9), and the outlet of the cold tank (9) is connected to the inlet of the first circulation pump (7).

6. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 5, characterized in that: The temperature of the hot tank (8) is set at 400°C, and the temperature of the cold tank (9) is set at 200°C.

7. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 5, characterized in that: In the storage tank heat storage and release module, the power of the compressor (1) is provided by the small steam engine (4) and the abandoned power of the new energy station, and the high-pressure cylinder (19), the medium-pressure cylinder (21), the low-pressure cylinder (28) and the generator (35) are coaxially connected.

8. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 5, characterized in that: In the storage tank heat storage and release module, the mass flow rate diverted by the first diverter valve (18) is determined by the mass flow rate of the circulating medium in the heat tank (8).

9. The coal-fired heat and power cogeneration system with integrated heat pump thermal storage system according to claim 5, characterized in that: In the storage tank heat storage and release module, the heat storage medium in the storage tank includes heat transfer oil, and the circulating working fluid compressed by the compressor (1) includes argon and carbon dioxide.

10. An operation method of a coal-fired cogeneration system with an integrated heat pump thermal storage system, applicable to the coal-fired cogeneration system with an integrated heat pump thermal storage system as claimed in claim 5, characterized in that: The system can be switched to a heat storage state or a heat release state; when the system is in the heat storage state, the return water of the heating network first releases heat in the cold source heat exchanger (3), and then is heated in sequence by the first peak heater (36) supplied with steam through the steam ejector (33) and the second peak heater (37) supplied with steam directly through the medium pressure cylinder (21) to reach the supply water temperature of the heating network; the heat storage medium flows out of the cold tank (9), enters the hot tank (8) after being heated by high-temperature and high-pressure gas in the heat source heat exchanger (5), and the high-pressure and medium-temperature gas passes through the regenerator (2) and the small steam turbine (4) in sequence to become low-temperature and low-pressure gas, and then passes through the cold source heat exchanger (3) and the regenerator (5) to heat the hot tank (8). After being heated by the heat exchanger (2), the heat storage medium becomes medium-temperature low-pressure gas; when the system is in a heat release state, the heat storage medium is pressurized by the second circulation pump (10) from the hot tank (8) and enters the heat exchanger (11) to heat the feed water from the outlet of the feed water pump (20) to make it reach the feed water temperature of the boiler (13); after the heating is completed, the heat storage medium is depressurized by the second throttle valve (12) and enters the cold tank (9); the return water of the heating network is heated by the first peak heater (36) and the second peak heater (37) in turn to reach the supply water temperature of the heating network, and the steam source of the first peak heater (36) and the second peak heater (37) is the same as when the system is in a heat storage state.

Images