A peak-shaving system for thermal power plants coupled with heat pump energy storage

Abstract

The present disclosure proposes a thermal power plant peak-shaving system coupled with a heat pump energy storage, comprising: a thermal power system, a heat pump system, an energy storage system and a heating system; wherein, when in the peak-shaving state, the heat absorption channel of the heat pump system is used to absorb heat from the steam circulation path, and the heat release channel of the heat pump system is used to release heat to the energy storage system; when in the peak state, the heat absorption channels of the superheater, the evaporator and the preheater are used to absorb heat from the energy storage system in sequence, and the heat release channels of the preheater, the evaporator and the superheater are used to release heat to the steam circulation path in sequence. In a thermal power plant peak-shaving system coupled with a heat pump energy storage disclosed in the present disclosure, a heat pump cycle is established between the thermal power system and the energy storage system using a heat pump system, and the thermal energy of the peak-shaving steam is "transferred" to the energy storage system to improve the quality and increase the value of the thermal energy. The heat pump cycle can provide the energy storage system with thermal energy that is several times the amount of power consumption, thereby effectively improving the electrical efficiency of the system.

Description

Technical Field

[0001] The present disclosure relates to the technical field of thermal power peak regulation, and in particular to a thermal power plant peak regulation system coupled with a heat pump energy storage. Background Art

[0002] At present, the coal power industry is focusing on the direction of thermal power flexibility transformation. However, the current technical means only stay at "thermal and electric decoupling", and there is still a bottleneck problem in "machine-boiler decoupling", that is, the energy storage system releases energy only for heating, and cannot achieve efficient power generation. Specifically, the temperature quality of high-temperature thermal energy stored in the extraction molten salt heat storage cannot meet the main steam parameter requirements. On the one hand, it is due to the difference in the two heat exchange ends, and on the other hand, it is restricted by different extraction points of the units, resulting in the heat release process of the extraction molten salt heat storage to supply high-temperature steam to surrounding users or to pass into inefficient parts such as the low-pressure cylinder and regenerator of the original unit, and cannot be passed into the main steam pipeline and other passages, resulting in poor energy utilization. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the purpose of the present disclosure is to provide a thermal power plant peak-shaving system coupled with a heat pump energy storage.

[0005] To achieve the above-mentioned purpose, the present disclosure provides a peak-shaving system for a thermal power plant coupled with a heat pump energy storage, comprising: a thermal power system, a heat pump system, an energy storage system and a heating system; wherein the thermal power system has a steam circulation path and generates electricity using superheated steam in the steam circulation path; the heating system comprises: a superheater, an evaporator and a preheater; when in a peak-shaving state, a heat absorption channel of the heat pump system is used to absorb heat from the steam circulation path, and a heat release channel of the heat pump system is used to release heat to the energy storage system; when in a peak state, the heat absorption channels of the superheater, the evaporator and the preheater are used to absorb heat from the energy storage system in turn, and the heat release channels of the preheater, the evaporator and the superheater are used to release heat to the steam circulation path in turn.

[0006] Optionally, the heat absorption channel input end of the superheater is connected to the high-temperature medium output end of the energy storage system, and the heat absorption channel input end of the evaporator is connected to the heat absorption channel output end of the superheater, the heat absorption channel input end of the preheater is connected to the heat absorption channel output end of the evaporator, and the heat absorption channel output end of the preheater is connected to the low-temperature medium input end of the energy storage system; the heat release channel input end of the preheater is connected to the return water passage of the steam circulation passage, and the heat release channel input end of the evaporator is connected to the heat release channel output end of the preheater, the heat release channel input end of the superheater is connected to the heat release channel output end of the evaporator, and the heat release channel output end of the superheater is connected to the main steam passage of the steam circulation passage.

[0007] Optionally, the heating system also includes: a reheater, wherein the heat absorption channel input end of the reheater is connected to the high-temperature medium output end of the energy storage system, and the heat absorption channel output end of the reheater is connected to the low-temperature medium input end of the energy storage system, the heat release channel input end of the reheater is connected to the return steam passage of the steam circulation passage, and the heat release channel output end of the reheater is connected to the reheat steam passage of the steam circulation passage.

[0008] Optionally, the thermal power system includes: a boiler, a high-pressure cylinder, a medium- and low-pressure cylinders, and a generator; wherein the high-pressure cylinder, the medium- and low-pressure cylinders, and the generator are sequentially connected by transmission; the input end of the high-pressure cylinder is respectively connected to the output end of the main steam heating passage of the boiler and the output end of the heat release passage of the superheater, and the first output end of the high-pressure cylinder is respectively connected to the input end of the reheat steam heating passage of the boiler and the input end of the heat release passage of the reheater; the input ends of the medium- and low-pressure cylinders are respectively connected to the output end of the reheat steam heating passage of the boiler and the output end of the heat release passage of the reheater, and the first output ends of the medium- and low-pressure cylinders are respectively connected to the input end of the main steam heating passage of the boiler and the input end of the heat release passage of the preheater; when in the peak shaving state, the heat absorption channel of the heat pump system is used to absorb heat from at least one of the boiler, the high-pressure cylinder, the medium- and low-pressure cylinders.

[0009] Optionally, the thermal power system also includes: a condenser, a low-pressure heater, a deaerator and a high-pressure heater; wherein the input end of the condenser is connected to the first output end of the medium and low-pressure cylinders, and the output end of the condenser is connected to the heat absorption channel input end of the low-pressure heater, and the heat release channel input end of the low-pressure heater is connected to the second output end of the medium and low-pressure cylinders; the input end of the deaerator is respectively connected to the heat absorption channel output end of the low-pressure heater, the heat release channel output end of the low-pressure heater and the third output end of the medium and low-pressure cylinders, and the output end of the deaerator is connected to the heat absorption channel input end of the high-pressure heater; the heat release channel input end of the high-pressure heater is connected to the second output end of the high-pressure cylinder, and the heat release channel output end and the heat absorption channel output end of the high-pressure heater are respectively connected to the main steam heating path input end of the boiler and the heat release channel input end of the preheater.

[0010] Optionally, the heating system also includes: a steam drum, which is arranged between the heat release channel input end of the evaporator and the heat release channel output end of the preheater and between the heat release channel input end of the superheater and the heat release channel output end of the evaporator, the first input end of the steam drum is connected to the heat release channel output end of the preheater, the first output end of the steam drum is connected to the heat release channel input end of the evaporator, the second input end of the steam drum is connected to the heat release channel output end of the evaporator, and the second output end of the steam drum is connected to the heat release channel input end of the superheater.

[0011] Optionally, the heat pump system includes: an electric motor, a shaft power transmission mechanism, a compressor, an expander, a steam extraction heat exchanger and a heat storage heat exchanger; wherein the electric motor, the compressor and the expander are sequentially connected by transmission, and the compressor and the thermal power system are connected by transmission through the shaft power transmission mechanism; the heat absorption channel of the steam extraction heat exchanger is used to absorb heat from the steam circulation passage, and the heat release channel input end of the steam extraction heat exchanger is connected to the output end of the expander, and the heat release channel output end of the steam extraction heat exchanger is connected to the input end of the compressor; the heat absorption channel input end of the heat storage heat exchanger is connected to the output end of the compressor, and the heat absorption channel output end of the heat storage heat exchanger is connected to the input end of the expander, the heat release channel input end of the heat storage heat exchanger is connected to the low-temperature medium output end of the energy storage system, and the heat release channel output end of the heat storage heat exchanger is connected to the high-temperature medium input end of the energy storage system.

[0012] Optionally, the heat pump system also includes: an ejector, a first input end of the ejector being respectively connected to the main steam passage of the steam circulation passage, the high-pressure cylinder of the steam circulation passage, and the medium and low-pressure cylinders of the steam circulation passage, and an output end of the ejector being connected to an input end of a heat absorption channel of the extraction heat exchanger, and an output end of the heat absorption channel of the extraction heat exchanger being connected to an input end of a condenser of the steam circulation passage.

[0013] Optionally, the heat pump system further includes: a temperature reduction and pressure reduction device, wherein the input end of the temperature reduction and pressure reduction device is connected to the output end of the heat absorption channel of the extraction heat exchanger, and the output end of the temperature reduction and pressure reduction device is connected to the input end of the deaerator of the steam circulation path.

[0014] Optionally, the heat pump system also includes: a heat supply heat exchanger, wherein the heat absorption channel input end of the heat supply heat exchanger is connected to the heat absorption channel output end of the steam extraction heat exchanger, and the heat absorption channel output end of the heat supply heat exchanger is connected to the condenser output end of the steam circulation path, and the heat release channel of the heat supply heat exchanger is used to release heat to the heating system.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] When in peak load state, the heat absorption channel of the heat pump system absorbs heat from the steam circulation path in the thermal power system, and uses the heat release of the heat release channel to store the heat in the energy storage system. When in peak state, the heat absorption channels of the superheater, evaporator and preheater absorb heat from the energy storage system in turn, and use the heat release of the preheater, evaporator and superheater heat release channels in turn to transfer the heat to the steam circulation path. Thus, the transfer of heat between the thermal power system, the heat pump system and the energy storage system is used to achieve the flexible operation of the thermal power system. Among them, a heat pump cycle is established between the thermal power system and the energy storage system using the heat pump system to "transfer" the thermal energy of the peak load steam to the energy storage system to improve the quality and increase the value of the thermal energy. The heat pump cycle can provide the energy storage system with heat energy several times the power consumption, thereby effectively improving the electrical efficiency of the system and achieving efficient power generation of the thermal power system.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a thermal power plant peak load regulation system coupled with a heat pump energy storage proposed in an embodiment of the present disclosure;

[0020] As shown in the figure: 1. Thermal power system, 11. Boiler, 12. High-pressure cylinder, 13. Medium- and low-pressure cylinders, 14. Generator, 15. Condenser, 16. Low-pressure heater, 17. Deaerator, 18. High-pressure heater;

[0021] 2. Heat pump system, 21. Electric motor, 22. Compressor, 23. Expander, 24. Extraction heat exchanger, 25. Heat storage heat exchanger, 26. Ejector, 27. Temperature and pressure reduction device, 28. Heating heat exchanger, 29. Shaft power transmission mechanism;

[0022] 3. Energy storage system;

[0023] 4. Heating system, 41. Superheater, 42. Evaporator, 43. Preheater, 44. Reheater, 45. Steam drum. DETAILED DESCRIPTION

[0024] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0025] like Figure 1 As shown, the embodiment of the present disclosure proposes a peak-shaving system of a thermal power plant coupled with a heat pump energy storage, comprising: a thermal power system 1, a heat pump system 2, an energy storage system 3 and a heating system 4. Among them, the thermal power system 1 has a steam circulation path and generates electricity using superheated steam in the steam circulation path, and the heating system 4 comprises: a superheater 41, an evaporator 42 and a preheater 43. When in the peak-shaving state, the heat absorption channel of the heat pump system 2 is used to absorb heat from the steam circulation path, and the heat release channel of the heat pump system 2 is used to release heat to the energy storage system 3. When in the peak state, the heat absorption channels of the superheater 41, the evaporator 42 and the preheater 43 are used to absorb heat from the energy storage system 3 in sequence, and the heat release channels of the preheater 43, the evaporator 42 and the superheater 41 are used to release heat to the steam circulation path in sequence.

[0026] It can be understood that when in the peak-shaving state, the heat absorption channel of the heat pump system 2 absorbs heat from the steam circulation path in the thermal power system 1, and utilizes the heat release of the heat release channel to store the heat in the energy storage system 3. When in the peak state, the heat absorption channels of the superheater 41, the evaporator 42 and the preheater 43 absorb heat from the energy storage system 3 in turn, and utilize the heat release of the preheater 43, the evaporator 42 and the superheater 41 The heat release channels are used to transfer heat to the steam circulation path. Thus, the flexible operation of the thermal power system 1 is achieved by utilizing the transfer of heat between the thermal power system 1, the heat pump system 2 and the energy storage system 3.

[0027] Among them, a heat pump cycle is established between the thermal power system 1 and the energy storage system 3 using the heat pump system 2 to "transfer" the thermal energy of the peak-shaving steam to the energy storage system 3 to improve the quality and increase the value of the thermal energy. The heat pump cycle can provide the energy storage system 3 with thermal energy that is several times the amount of electricity consumed, thereby effectively improving the electrical efficiency of the system and achieving efficient power generation of the thermal power system 1.

[0028] It should be noted that in improving the construction of supporting power peak-shaving capacity, the difference from nuclear power peak-shaving is that the load of boiler 11 of thermal power system 1 can be adjusted and there is a minimum power; the peak-shaving depth of thermal power system 1 is limited by the minimum stable combustion load of boiler 11, and the minimum stable combustion load of boiler 11 is often about 10% higher than the minimum operating load of steam turbine, and the low-load combustion of boiler 11 causes high damage to steam parameters, desulfurization and denitrification, and boiler 11 life; in addition, the automatic input rate of thermal power system 1 during the peak-shaving process is low, resulting in slow response speed and inability to quickly adapt to the peak-shaving needs of the power grid. Some units need to optimize the coordinated control system to adapt to the requirements of rapid peak-shaving; and the current thermal power system 1 basically did not consider the deep peak-shaving conditions during the design stage, resulting in poor peak-shaving capacity during operation, which requires more research and transformation work.

[0029] The heat pump system 2 and the energy storage system 3 have significant advantages such as high energy storage density, small footprint, wide adjustment range, flexible layout, and independence from geographical conditions. The energy storage scale can be expanded by adding heat storage units, and it can be highly adapted to thermal power systems 1 of different capacities. Combining heat pump energy storage with the thermal power system 1 can have a positive effect on the stability of the power grid, the consumption of renewable energy, the operational flexibility of the thermal power system 1, and the life of the unit.

[0030] In the peak-shaving system of the thermal power plant of this embodiment, by coupling the heat pump energy storage in the thermal power system 1, a high-temperature heat pump cycle is established between the thermal power peak-shaving steam and the high-temperature heat storage, and the thermal energy of the peak-shaving steam is "transported" to the high-temperature energy storage system 3 to achieve thermal energy quality improvement and value-added, so that the boiler 11 can maintain a high load during the peak-shaving of the unit, and the output is 0 during deep peak-shaving, thereby improving the peak-shaving thermal efficiency of the unit, reducing the fuel consumption of the unit and extending the life of the unit. At the same time, the rapid climbing and response capabilities of the thermal power system 1 are improved, the absorption capacity of new energy is increased, and the energy security and the regulation capacity of the power system are improved. For the gas-steam combined cycle, the problem of low main steam parameters during deep peak-shaving of the unit still exists. At this time, the coupling scheme of this embodiment can also be used to improve quality and efficiency.

[0031] The thermal power system 1 is used to generate superheated steam in the steam circulation path using fuels such as coal and heat stored in the energy storage system 3, and to generate electricity using the superheated steam to meet electricity demand. The specific type of the thermal power system 1 can be set according to actual needs and is not limited to this.

[0032] The heat pump system 2 is used to "transport" the thermal energy of the peak-shaving steam in the steam circulation path to the energy storage system 3 to improve the quality and increase the value of the thermal energy. The specific type of the heat pump system 2 can be set according to actual needs and is not limited to this.

[0033] The energy storage system 3 is used to store the heat energy "transported" by the heat pump system 2 from the thermal power system 1 when in the peak shaving state, and to release the stored heat to the thermal power system 1 using the heating system 4 when in the peak state. The specific type of the energy storage system 3 can be set according to actual needs and is not limited to this. By way of example, the energy storage system 3 includes: a low-temperature tank and a high-temperature tank, the low-temperature medium output end of the low-temperature tank is connected to the high-temperature medium input end of the high-temperature tank, the high-temperature medium output end of the high-temperature tank is connected to the low-temperature medium input end of the low-temperature tank, wherein the passage between the low-temperature medium output end of the low-temperature tank and the high-temperature medium input end of the high-temperature tank is used to absorb heat from the steam circulation passage in the thermal power system 1, and the high-temperature medium output end of the high-temperature tank and the low-temperature medium input end of the low-temperature tank are used to release heat to the steam circulation passage in the thermal power system 1.

[0034] The energy storage medium in the energy storage system 3 may be potassium nitrate, calcium nitrate, sodium nitrate, sodium nitrite, lithium nitrate, mineral oil or a mixture thereof, without limitation. In this embodiment, the energy storage medium is preferably solar salt to achieve solar salt molten salt heat storage.

[0035] The heating system 4 is used to release the heat stored in the energy storage system 3 into the steam circulation path of the thermal power system 1, wherein the preheater 43 is used to preheat the return water in the steam circulation path, the evaporator 42 is used to heat the preheated water of the preheater 43 into steam, and the superheater 41 is used to heat the steam of the evaporator 42 into superheated steam, thereby using the superheated steam to meet the peak power generation demand of the thermal power system 1. The specific types of the superheater 41, evaporator 42 and preheater 43 can be set according to actual needs, and there is no restriction on this. Among them, the superheater 41, evaporator 42 and preheater 43 all include: a heat absorption channel and a heat release channel for direct or indirect heat exchange.

[0036] like Figure 1As shown, in some embodiments, the heat absorption channel input end of the superheater 41 is connected to the high-temperature medium output end of the energy storage system 3, and the heat absorption channel input end of the evaporator 42 is connected to the heat absorption channel output end of the superheater 41, the heat absorption channel input end of the preheater 43 is connected to the heat absorption channel output end of the evaporator 42, and the heat absorption channel output end of the preheater 43 is connected to the low-temperature medium input end of the energy storage system 3; the heat release channel input end of the preheater 43 is connected to the return water passage of the steam circulation passage, and the heat release channel input end of the evaporator 42 is connected to the heat release channel output end of the preheater 43, the heat release channel input end of the superheater 41 is connected to the heat release channel output end of the evaporator 42, and the heat release channel output end of the superheater 41 is connected to the main steam passage of the steam circulation passage.

[0037] It can be understood that since the heat absorption channel of the superheater 41, the heat absorption channel of the evaporator 42 and the heat absorption channel of the preheater 43 are sequentially connected in series between the high-temperature medium output end of the energy storage system 3 and the low-temperature medium input end of the energy storage system 3, and the heat release channel of the preheater 43, the heat release channel of the evaporator 42 and the heat release channel of the superheater 41 are sequentially connected in series between the return water passage of the steam circulation passage and the main steam passage of the steam circulation passage, the preheater 43 can use the storage medium with a lower temperature to preheat the return water of the steam circulation passage, the evaporator 42 can use the energy storage medium with a higher temperature to heat the preheated water of the preheater 43 into steam, and the superheater 41 can use the energy storage medium with an extremely high temperature to heat the steam of the evaporator 42 into superheated steam. Therefore, through the cooperation of the superheater 41, the evaporator 42 and the preheater 43, the heat stored in the energy storage system 3 is used to realize the conversion of return water to superheated steam in the thermal power system 1, thereby effectively improving the peak power generation capacity of the thermal power system 1.

[0038] It should be noted that, for the arrangement of the heat absorption channel of the superheater 41, the heat absorption channel of the evaporator 42 and the heat absorption channel of the preheater 43, for example, the heat absorption channel input end of the superheater 41 is connected to the high-temperature medium output end of the high-temperature tank, and the heat absorption channel output end of the preheater 43 is connected to the low-temperature medium input end of the low-temperature tank.

[0039] As for the arrangement of the heat release channel of the preheater 43, the heat release channel of the evaporator 42 and the heat release channel of the superheater 41, for example, the heat release channel input end of the preheater 43 is respectively connected to the heat release channel output end and the heat absorption channel output end of the high-pressure heater 18, and the heat release channel output end of the superheater 41 is connected to the input end of the high-pressure cylinder 12.

[0040] like Figure 1As shown, in some embodiments, the heating system 4 also includes: a reheater 44, the heat absorption channel input end of the reheater 44 is connected to the high-temperature medium output end of the energy storage system 3, and the heat absorption channel output end of the reheater 44 is connected to the low-temperature medium input end of the energy storage system 3, the heat release channel input end of the reheater 44 is connected to the return steam passage of the steam circulation passage, and the heat release channel output end of the reheater 44 is connected to the reheat steam passage of the steam circulation passage.

[0041] It can be understood that, since the heat absorption channel input end of the reheater 44 is connected to the high-temperature medium output end of the energy storage system 3, and the heat absorption channel output end of the reheater 44 is connected to the low-temperature medium input end of the energy storage system 3, the high-temperature energy storage medium in the energy storage system 3 can pass through the heat absorption channel of the reheater 44 and then return to the energy storage system 3, and since the heat release channel input end of the reheater 44 is connected to the return steam passage of the steam circulation passage, and the heat release channel output end of the reheater 44 is connected to the reheat steam passage of the steam circulation passage, the steam that has done work in the steam circulation passage can pass through the heat release channel of the reheater 44, and can be heated by the high-temperature energy storage medium in the heat absorption channel of the reheater 44 when passing through, thereby forming reheated steam and entering the reheat steam passage to continue to do work and generate electricity, thereby meeting the peak power generation demand of the thermal power system 1.

[0042] It should be noted that by improving the quality and increasing the value of thermal energy through the heat pump cycle, and cooperating with the preheater 43, the evaporator 42 and the superheater 41, the heated steam can meet the parameter requirements of the main steam in the thermal power system 1. At the same time, in conjunction with the reheater 44, the heated steam can meet the parameter requirements of the reheated steam in the thermal power system 1, thereby ensuring a high energy utilization rate of the system and achieving a high peak power generation capacity of the thermal power system 1.

[0043] The reheater 44 is used to transfer the heat energy of the high-temperature energy storage medium in the energy storage system 3 to the return steam of the thermal power system 1 to achieve reheating of steam. The specific type of the reheater 44 can be set according to actual needs and is not limited to this. The reheater 44 also includes: a heat absorption channel and a heat release channel for direct or indirect heat exchange.

[0044] Regarding the arrangement of the heat absorption channel of the reheater 44, for example, the input end of the heat absorption channel of the reheater 44 is connected to the high-temperature medium output end of the high-temperature tank, and the output end of the heat absorption channel of the reheater 44 is connected to the low-temperature medium input end of the low-temperature tank; regarding the arrangement of the heat release channel of the reheater 44, for example, the input end of the heat release channel of the reheater 44 is connected to the first output end of the high-pressure cylinder 12, and the output end of the heat release channel of the reheater 44 is connected to the input end of the medium and low-pressure cylinders 13.

[0045] like Figure 1As shown, in some embodiments, the thermal power system 1 includes: a boiler 11, a high-pressure cylinder 12, a medium-low-pressure cylinder 13 and a generator 14. Among them, the high-pressure cylinder 12, the medium-low-pressure cylinder 13 and the generator 14 are sequentially connected in transmission, the input end of the high-pressure cylinder 12 is respectively connected to the output end of the main steam heating passage of the boiler 11 and the output end of the heat release passage of the superheater 41, and the first output end of the high-pressure cylinder 12 is respectively connected to the input end of the reheat steam heating passage of the boiler 11 and the input end of the heat release passage of the reheater 44, the input end of the medium-low-pressure cylinder 13 is respectively connected to the output end of the reheat steam heating passage of the boiler 11 and the output end of the heat release passage of the reheater 44, and the first output end of the medium-low-pressure cylinder 13 is respectively connected to the input end of the main steam heating passage of the boiler 11 and the input end of the heat release passage of the preheater 43. When in the peak load state, the heat absorption channel of the heat pump system 2 is used to absorb heat from at least one of the boiler 11, the high-pressure cylinder 12, and the medium-low-pressure cylinder 13.

[0046] It can be understood that since the input end of the high-pressure cylinder 12 is connected to the output end of the main steam heating passage of the boiler 11, and the first output end of the high-pressure cylinder 12 is connected to the input end of the reheat steam heating passage of the boiler 11, the input end of the medium and low-pressure cylinder 13 is connected to the output end of the reheat steam heating passage of the boiler 11, and the first output end of the medium and low-pressure cylinder 13 is connected to the input end of the main steam heating passage of the boiler 11, the condensate output from the first output end of the medium and low-pressure cylinder 13 can be converted into main steam when passing through the main steam heating passage of the boiler 11, and the main steam passes through the reheat steam heating passage of the boiler 11 and is converted into reheat steam after doing work in the high-pressure cylinder 12, and the reheat steam is converted into condensate again after doing work in the medium and low-pressure cylinder 13. Therefore, the efficient power generation of the generator 14 can be achieved by utilizing the heating of the boiler 11 and the circulation of condensate.

[0047] Furthermore, since the input end of the high-pressure cylinder 12 is connected to the output end of the heat release channel of the superheater 41, and the first output end of the high-pressure cylinder 12 is connected to the input end of the heat release channel of the reheater 44, the input end of the medium- and low-pressure cylinder 13 is connected to the output end of the heat release channel of the reheater 44, and the first output end of the medium- and low-pressure cylinder 13 is connected to the input end of the heat release channel of the preheater 43, the condensate output from the first output end of the medium- and low-pressure cylinder 13 can be converted into main steam when passing through the heat release channel of the preheater 43, the superheater channel of the evaporator 42, and the heat release channel of the superheater 41 in sequence, and the main steam passes through the heat release channel of the reheater 44 and is converted into reheated steam after doing work in the high-pressure cylinder 12, and the reheated steam is converted into condensate again after doing work in the medium- and low-pressure cylinder 13. Therefore, the power generation capacity of the generator 14 can be effectively improved by utilizing the heating of the preheater 43, the evaporator 42, the superheater 41, and the reheater 44 and the circulation of the condensate.

[0048] It should be noted that the boiler 11 is used to heat water vapor using fuel such as coal to generate main steam for the high-pressure cylinder 12 and reheated steam for the medium and low-pressure cylinders 13. The specific type of the boiler 11 can be set according to actual needs and is not limited to this.

[0049] By controlling the feed water flow rate entering the boiler 11 and the exhaust steam flow rate of the high-pressure cylinder 12, the heat pump energy storage can partially or completely replace the boiler 11. Furthermore, the system of this embodiment realizes peak period through a complete steam generation system, and the output of the boiler 11 and the heat storage system release heat to jointly generate electricity.

[0050] The high-pressure cylinder 12 is used to utilize the work of the main steam to drive the generator 14 to generate electricity, and the medium and low-pressure cylinders 13 are used to utilize the work of the reheated steam to drive the generator 14 to generate electricity. The specific types of the high-pressure cylinder 12 and the medium and low-pressure cylinders 13 can be set according to actual needs and are not limited to this.

[0051] The generator 14 is used to convert mechanical energy into electrical energy under the drive of the high-pressure cylinder 12 and the medium- and low-pressure cylinders 13. The specific type of the generator 14 can be set according to actual needs and is not limited to this.

[0052] like Figure 1 As shown, in some embodiments, the thermal power system 1 further includes: a condenser 15, a low-pressure heater 16, a deaerator 17 and a high-pressure heater 18. Among them, the input end of the condenser 15 is connected to the first output end of the medium and low pressure cylinder 13, and the output end of the condenser 15 is connected to the heat absorption channel input end of the low-pressure heater 16, the heat release channel input end of the low-pressure heater 16 is connected to the second output end of the medium and low pressure cylinder 13, the input end of the deaerator 17 is respectively connected to the heat absorption channel output end of the low-pressure heater 16, the heat release channel output end of the low-pressure heater 16 and the third output end of the medium and low pressure cylinder 13, and the output end of the deaerator 17 is connected to the heat absorption channel input end of the high-pressure heater 18, the heat release channel input end of the high-pressure heater 18 is connected to the second output end of the high-pressure cylinder 12, and the heat release channel output end and the heat absorption channel output end of the high-pressure heater 18 are respectively connected to the main steam heating passage input end of the boiler 11 and the heat release channel input end of the preheater 43.

[0053] It can be understood that, since the input end of the condenser 15 is connected to the first output end of the medium and low pressure cylinder 13, and the output end of the condenser 15 is connected to the input end of the heat absorption channel of the low pressure heater 16, the steam after the medium and low pressure cylinder 13 does work can be converted into condensed water by the condenser 15 and transported to the heat absorption channel of the low pressure heater 16; since the input end of the heat release channel of the low pressure heater 16 is connected to the second output end of the medium and low pressure cylinder 13, and the input end of the deaerator 17 is respectively connected to the output end of the heat absorption channel of the low pressure heater 16, the output end of the heat release channel of the low pressure heater 16 and the third output end of the medium and low pressure cylinder 13, the output end of the deaerator 17 is connected to the input end of the heat absorption channel of the high pressure heater 18, so that the condensed water can be transported to the heat absorption channel of the low pressure heater 16. The steam of the medium and low pressure cylinders 13 can be used for preheating, and the preheated condensed water and the water vapor after releasing heat enter the deaerator 17 for deoxygenation; since the heat release channel input end of the high pressure heater 18 is connected to the second output end of the high pressure cylinder 12, and the heat release channel output end and the heat absorption channel output end of the high pressure heater 18 are respectively connected to the main steam heating passage input end of the boiler 11 and the heat release channel input end of the preheater 43, the deoxygenated water after deoxygenation can be further preheated by the steam of the high pressure cylinder 12, and the preheated deoxygenated water and the water vapor after releasing heat enter the main steam heating passage of the boiler 11 and the heat release channel of the heating system 4 and are converted into main steam, thereby realizing the steam circulation in the steam circulation passage.

[0054] It should be noted that the condenser 15 is used to condense steam by utilizing the heat exchange of cooling water, so that the steam after work in the medium and low pressure cylinders 13 is converted into condensed water. The specific type of the condenser 15 can be set according to actual needs and is not limited to this.

[0055] The low-pressure heater 16 and the high-pressure heater 18 are both used for preheating condensate. The low-pressure heater 16 is used to preheat condensate using the steam in the medium and low-pressure cylinders 13, and the high-pressure heater 18 is used to preheat deoxygenated water using the steam in the high-pressure cylinder 12. The specific types of the low-pressure heater 16 and the high-pressure heater 18 can be set according to actual needs and are not limited to this.

[0056] The deaerator 17 is used to remove oxygen from the condensate to reduce corrosion to the system. The specific type of the deaerator 17 can be set according to actual needs and is not limited to this.

[0057] In order to ensure the stable circulation of water vapor, working fluid pumps may be provided at the output end of the condenser 15 and the output end of the deaerator 17 respectively.

[0058] like Figure 1As shown, in some embodiments, the heating system 4 also includes: a steam drum 45, which is arranged between the heat release channel input end of the evaporator 42 and the heat release channel output end of the preheater 43 and between the heat release channel input end of the superheater 41 and the heat release channel output end of the evaporator 42, the first input end of the steam drum 45 is connected to the heat release channel output end of the preheater 43, the first output end of the steam drum 45 is connected to the heat release channel input end of the evaporator 42, the second input end of the steam drum 45 is connected to the heat release channel output end of the evaporator 42, and the second output end of the steam drum 45 is connected to the heat release channel input end of the superheater 41.

[0059] It can be understood that, since the first input end of the drum 45 is connected to the output end of the heat release channel of the preheater 43, and the first output end of the drum 45 is connected to the input end of the heat release channel of the evaporator 42, the second input end of the drum 45 is connected to the output end of the heat release channel of the evaporator 42, and the second output end of the drum 45 is connected to the input end of the heat release channel of the superheater 41, the return water preheated in the heat release channel of the preheater 43 can enter the heat release channel of the evaporator 42 through the drum 45, and the steam-water mixture in the heat release channel of the evaporator 42 can be separated by the drum 45, and the separated steam enters the heat release channel of the superheater 41 to be heated into superheated steam, and the separated water returns to the evaporator 42 for further heating. Therefore, through the setting of the drum 45, the quality of the superheated steam generated by the heating system 4 is effectively improved, thereby ensuring the efficient power generation of the thermal power system 1.

[0060] It should be noted that the steam drum 45 is used for steam-water separation to improve the quality of steam. The specific type of the steam drum 45 can be set according to actual needs and is not limited to this.

[0061] In order to ensure the stable circulation of water vapor, a working fluid pump may be provided between the first output end of the steam drum 45 and the input end of the heat release channel of the evaporator 42 .

[0062] like Figure 1As shown, in some embodiments, the heat pump system 2 includes: a motor 21, a compressor 22, an expander 23, a steam extraction heat exchanger 24 and a heat storage heat exchanger 25. Among them, the motor 21, the shaft power transmission mechanism 29, the compressor 22 and the expander 23 are sequentially connected by transmission, and the compressor 22 and the thermal power system 1 are connected by transmission through the shaft power transmission mechanism 29, the heat absorption channel of the steam extraction heat exchanger 24 is used to absorb heat from the steam circulation passage, and the heat release channel input end of the steam extraction heat exchanger 24 is connected to the output end of the expander 23, the heat release channel output end of the steam extraction heat exchanger 24 is connected to the input end of the compressor 22, the heat absorption channel input end of the heat storage heat exchanger 25 is connected to the output end of the compressor 22, and the heat absorption channel output end of the heat storage heat exchanger 25 is connected to the input end of the expander 23, the heat release channel input end of the heat storage heat exchanger 25 is connected to the low-temperature medium output end of the energy storage system 3, and the heat release channel output end of the heat storage heat exchanger 25 is connected to the high-temperature medium input end of the energy storage system 3.

[0063] It can be understood that since the heat absorption channel of the extraction heat exchanger 24 absorbs heat from the steam circulation path, and the heat release channel input end of the extraction heat exchanger 24 is connected to the output end of the expansion machine 23, and the heat release channel output end of the extraction heat exchanger 24 is connected to the input end of the compressor 22, when the circulating working fluid is transported from the output end of the expansion machine 23 to the input end of the compressor 22, the heat exchange between the heat release channel and the heat absorption channel in the extraction heat exchanger 24 can be used to realize the transfer of steam heat in the steam circulation path to the circulating working fluid.

[0064] Since the heat absorption channel input end of the heat storage heat exchanger 25 is connected to the output end of the compressor 22, and the heat absorption channel output end of the heat storage heat exchanger 25 is connected to the input end of the expander 23, the heat release channel input end of the heat storage heat exchanger 25 is connected to the low-temperature medium output end of the energy storage system 3, and the heat release channel output end of the heat storage heat exchanger 25 is connected to the high-temperature medium input end of the energy storage system 3, when the circulating working fluid is transported from the output end of the compressor 22 to the input end of the expander 23, the heat exchange between the heat release channel and the heat absorption channel in the heat storage heat exchanger 25 can be used to transfer the heat in the circulating working fluid to the energy storage system 3, thereby realizing heat storage.

[0065] Therefore, through the compression and temperature increase and pressure increase of the compressor 22 and the expansion and temperature decrease and pressure reduction of the expander 23, as well as the heat exchange of the extraction heat exchanger 24 and the heat storage heat exchanger 25, the steam heat in the steam circulation path can be used as a low-temperature heat source for the heat pump system 2 based on the reverse Brayton cycle, and the advantage of COP>1 can be used to obtain heat value-added, thereby achieving quality improvement and value-added of thermal energy during peak regulation, and then coupling with the thermal power system 1 to achieve peak efficient power generation.

[0066] It should be noted that the extraction heat exchanger 24 and the heat storage heat exchanger 25 are both used for heat exchange. The extraction heat exchanger 24 is used to absorb heat from the steam in the steam circulation path, and the heat storage heat exchanger 25 is used to release the heat to the energy storage medium of the energy storage system 3. The extraction heat exchanger 24 and the heat storage heat exchanger 25 both have heat absorption channels and heat exchange channels for direct or indirect heat exchange. The specific types of the extraction heat exchanger 24 and the heat storage heat exchanger 25 can be set according to actual needs, and there is no restriction on this.

[0067] The specific types of the compressor 22 and the expander 23 can be set according to actual needs, and there is no restriction on this. Among them, the working fluid circulates between the compressor 22 and the expander 23, and the compressor 22 and the expander 23 are connected by transmission. Specifically, the compressor 22 can convert the low-pressure working fluid into a high-pressure state, and at the same time, increase the temperature of the working fluid by increasing the pressure; the expander 23 can make the working fluid expand adiabatically inside, consume the internal energy of the working fluid itself, so that the pressure and temperature of the working fluid are greatly reduced, and the purpose of refrigeration and cooling is achieved. At the same time, the expander 23 can output mechanical work to the outside during the expansion of the working fluid, which can convert the internal energy of the working fluid into mechanical energy.

[0068] The motor 21 is used to drive the compressor 22 using electric energy. The specific type of the motor 21 can be set according to actual needs and is not limited thereto.

[0069] The shaft power transmission mechanism 29 is used to utilize the mechanical energy of the thermal power system 1 to drive the compressor 22, which realizes direct transmission between the thermal power system 1 and the compressor 22, thereby avoiding energy loss in the process of converting mechanical energy into electrical energy and then converting electrical energy into mechanical energy, thereby improving the system efficiency. The specific type of the shaft power transmission mechanism 29 can be set according to actual needs and is not limited to this. For example, the shaft power transmission mechanism 29 may include: clutch, gear box and other transmission components. The shaft power transmission mechanism 29 is arranged between the power output shafts of the medium and low pressure cylinders 12 and 13 of the thermal power system 1 and the power input shaft of the compressor 22.

[0070] During the specific operation process, the low-power starting motor 21 is used to drive the compressor 22 to the rated speed and then the shaft power transmission mechanism 29 is applied to achieve the coupled operation of the thermal power system 1 and the heat pump system 2 in a steady state, thereby further improving the energy conversion efficiency.

[0071] The heat pump system 2 can use one or more compressors 22, one or more expanders 23, one or more steam extraction heat exchangers 24 and a heat storage heat exchanger 25. The heat pump system 2 can receive electricity from an external power source (for example: a thermal power system 1, a wind power system, a photovoltaic system, a power grid, a solar thermal power generation system, a nuclear power system, etc.).

[0072] The compressor 22 and the expander 23 use a circulating working fluid to transfer energy. The circulating working fluid may be air, argon, nitrogen, helium, carbon dioxide, hydrogen, oxygen or a combination thereof, without limitation.

[0073] Specifically, in the heat pump system 2, after the electric drive motor 21 rotates or a small power motor 21 is used to drive the compressor 22 to the rated speed, the medium-temperature and low-pressure circulating working fluid becomes a high-temperature and high-pressure state after passing through the compressor 22, and transfers heat to the energy storage system 3 through the heat storage heat exchanger 25. After the circulating working fluid temperature is reduced and enters the expander 23, the temperature and pressure are further reduced, and then enters the steam extraction heat exchanger 24 to absorb the heat of the peak-shaving low-grade steam to increase the temperature, and enters the compressor 22, thereby completing an energy storage cycle.

[0074] The heat pump system 2 and the energy storage system 3 are coupled with the thermal power system 1. The heat pump system 2 is driven by the electricity or shaft power of the thermal power system 1, and part of the peak-shaving steam extraction of the thermal power system 1 is used as the low-temperature heat source of the heat pump system 2. While reducing the output of the thermal power system 1, this part of the heat source can also be "transported" to the energy storage system 3 of the heat pump energy storage for storage, thereby improving the quality and increasing the value of thermal energy.

[0075] like Figure 1 As shown, in some embodiments, the heat pump system 2 also includes: an ejector 26, a first input end of the ejector 26 is respectively connected to the main steam passage of the steam circulation passage, the high-pressure cylinder 12 of the steam circulation passage, and the medium and low-pressure cylinders 13 of the steam circulation passage, and the output end of the ejector 26 is connected to the input end of the heat absorption channel of the extraction heat exchanger 24, and the output end of the heat absorption channel of the extraction heat exchanger 24 is connected to the input end of the condenser 15 of the steam circulation passage.

[0076] It can be understood that since the first input end of the ejector 26 is respectively connected to the main steam passage of the steam circulation passage, the high-pressure cylinder 12 of the steam circulation passage and the medium and low-pressure cylinders 13 of the steam circulation passage, and the output end of the ejector 26 is connected to the input end of the heat absorption channel of the extraction heat exchanger 24, and the output end of the heat absorption channel of the extraction heat exchanger 24 is connected to the input end of the condenser 15 of the steam circulation passage, the ejector 26 can eject the steam in the high-pressure cylinder 12 and the steam in the medium and low-pressure cylinders 13 into the heat absorption channel of the extraction heat exchanger 24, and can also eject part of the main steam for temperature adjustment, thereby ensuring efficient heat exchange of the steam circulation passage and the heat pump system 2.

[0077] It should be noted that the ejector 26 is used to eject part of the steam in the main steam passage, part of the steam in the high-pressure cylinder 12 and part of the steam in the medium- and low-pressure cylinders 13 to the heat absorption channel of the extraction heat exchanger 24, so as to realize heat transfer. The specific type of the ejector 26 can be set according to actual needs and is not limited to this.

[0078] like Figure 1 As shown, in some embodiments, the heat pump system 2 also includes: a temperature reduction and pressure reduction device 27, the input end of the temperature reduction and pressure reduction device 27 is connected to the output end of the heat absorption channel of the steam extraction heat exchanger 24, and the output end of the temperature reduction and pressure reduction device 27 is connected to the input end of the deaerator 17 of the steam circulation path.

[0079] It can be understood that since the input end of the temperature reduction and pressure reduction device 27 is connected to the output end of the heat absorption channel of the extraction heat exchanger 24, and the output end of the temperature reduction and pressure reduction device 27 is connected to the input end of the deaerator 17 of the steam circulation path, part of the steam passing through the heat absorption channel of the extraction heat exchanger 24 can be directly discharged into the deaerator 17 by utilizing the temperature reduction and pressure reduction of the temperature reduction and pressure reduction device 27, thereby realizing the recycling of water vapor.

[0080] It should be noted that the temperature reduction and pressure reduction device 27 is used to reduce the temperature and pressure of the steam after heat release to protect the deaerator 17 and other equipment at the rear. The specific type of the temperature reduction and pressure reduction device 27 can be set according to actual needs and is not limited to this. For example, the temperature reduction and pressure reduction protector can be a temperature reduction and pressure reduction protector.

[0081] like Figure 1 As shown, in some embodiments, the heat pump system 2 also includes: a heat supply heat exchanger 28, wherein the heat absorption channel input end of the heat supply heat exchanger 28 is connected to the heat absorption channel output end of the steam extraction heat exchanger 24, and the heat absorption channel output end of the heat supply heat exchanger 28 is connected to the condenser 15 output end of the steam circulation path, and the heat release channel of the heat supply heat exchanger 28 is used to release heat to the heating system.

[0082] It can be understood that since the input end of the heat absorption channel of the heating heat exchanger 28 is connected to the output end of the heat absorption channel of the steam extraction heat exchanger 24, and the output end of the heat absorption channel of the heating heat exchanger 28 is connected to the output end of the condenser 15 of the steam circulation path, the heat release channel of the heating heat exchanger 28 releases heat to the heating system, so that part of the steam passing through the heat absorption channel of the steam extraction heat exchanger 24 can release heat to the heating system by utilizing the heat exchange of the heating heat exchanger 28, thereby fully utilizing the steam heat while meeting the heating demand.

[0083] It should be noted that the heat supply heat exchanger 28 is used to transfer the residual heat in part of the steam in the heat absorption channel of the extraction heat exchanger 24 to the heating system, so as to save the condensation of the part of the steam and realize the efficient use of heat. The specific type of the heat supply heat exchanger 28 can be set according to actual needs and is not limited to this. The heat supply heat exchanger 28 includes: a heat absorption channel and a heat exchange channel for direct or indirect heat exchange.

[0084] Among them, when the thermal power system 1 is deeply peak-shaving, the boiler 11 of the thermal power system 1 is operated at low load, and steam is extracted from any one or more ports at the inlet and outlet of the high-pressure cylinder 12 and the medium- and low-pressure cylinders 13. At the same time, part of the main steam is ejected through the ejector 26 for temperature adjustment, and then the above-mentioned peak-shaving steam is passed into the extraction heat exchanger 24 as a low-temperature heat source for the heat pump system 2.

[0085] After heat exchange, part of the liquid high-pressure water can enter the deaerator 17 after passing through the temperature reduction and pressure reduction device 27; during the startup process of the heat pump cycle, the output end of the heat absorption channel of the extraction steam heat exchanger 24 is steam, which can be passed into the condenser 15, or can enter the deaerator 17 after passing through the temperature reduction and pressure reduction device 27; during steady-state operation, the liquid high-pressure water after heat exchange through the extraction steam heat exchanger 24 can also be used for heating or flash steam supply by the heating heat exchanger 28, and combined with the high back pressure heating technology, stable heating can be achieved throughout the day.

[0086] It should be noted that the reflux point of water or steam at the output end of the heat absorption channel of the extraction heat exchanger 24 can be adjusted according to actual needs, and is not limited to the deaerator 17, the low-pressure heater 16, etc., but is preferably the position before the deaerator 17.

[0087] In the system of this embodiment, the peak-shaving steam is used as a low-temperature heat source for heat pump energy storage, and drives the heat pump system 2 to operate by driving the electric motor 21 to rotate or applying the shaft power transmission mechanism 29. This process can achieve deep peak-shaving of the unit to 0% output by reducing the output of the boiler 11, extracting steam to reduce the output of the steam turbine, and consuming shaft power.

[0088] At the peak of the thermal power system 1, the boiler 11 does not need to be fully fired, and the energy storage system 3 heats the boiler 11 feed water through the superheater 41, the evaporator 42 and the preheater 43 in sequence to produce high-temperature main steam and merge the high-temperature main steam with the main steam at the outlet of the boiler 11. At the same time, the reheater 44 can reduce the reheating load of the boiler 11 and achieve full power generation of the thermal power system 1100% rated load. In addition, the energy storage system 3 can also be used to drive the newly built power generation system to increase the peak capacity of the unit.

[0089] By applying the operation method in this embodiment, it is possible to achieve that the boiler 11 maintains a high load during the peak load regulation of the unit, and the output is 0 during deep peak load regulation, thereby improving the peak load thermal efficiency of the unit, reducing the fuel consumption of the unit and extending the life of the unit. For the gas-steam combined cycle, the problem of low main steam parameters during deep peak load regulation of the unit still exists, and the scheme of this embodiment can also be used to improve quality and efficiency. In addition, since the heat source load of the energy storage system 3 is adjustable during the heat release stage, there is no need to build a new generator 14, and the original unit can reserve power generation space for the energy storage system 3. At the same time, due to the thermal inertia and complex energy conversion process of the thermal power system 1, the thermal power system 1 has a slow response speed. By coupling the heat pump energy storage system 3, the climbing ability and response ability of the thermal power system 1 can be further improved. By driving the heat pump system 2 with new energy electricity, the new energy absorption capacity can also be improved.

[0090] This embodiment proposes a scheme for the coupled operation of thermal power and high-temperature heat pump energy storage, which overcomes the bottleneck problem of the decoupling of the "machine and boiler" of the thermal power system 1, realizes the deep and effective coupling of the thermal power system 1 and the high-temperature heat pump system 2, and can simultaneously realize the "three-in-one" of thermal power (energy-saving and carbon-reduction transformation, heating transformation, and flexibility transformation). Specifically, by coupling the heat pump energy storage in the thermal power system 1, the flexible operation of the thermal power system 1 can be realized, the coal consumption of the thermal power system 1 can be reduced, and the rapid ramping and response capabilities of the thermal power system 1 can be improved. At the same time, the level of new energy consumption can be improved through the heat pump system 2, and the safe and stable operation of the power system can be realized, and economic benefits can be brought to the thermal power plant.

[0091] In addition, the coupled operation scheme of this embodiment utilizes common heat media for heat storage, which has the advantages of low cost and high energy storage density. The heat pump energy storage system 3 is not restricted by geographical conditions. By coupling with the thermal power system 1, the heat pump energy storage system 3 can be driven by new energy electricity to ensure the safety and stability of the new power system. While achieving positive social benefits, it can also bring corresponding economic benefits to the thermal power plant.

[0092] It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0093] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0095] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A thermal power plant peak load regulation system coupled with heat pump energy storage, characterized in that: include: Thermal power systems, heat pump systems, energy storage systems and heating systems; Wherein, the thermal power system has a steam circulation path and generates electricity using superheated steam in the steam circulation path; The heating system comprises: a superheater, an evaporator and a preheater; When in peak load regulation mode, the heat absorption channel of the heat pump system is used to absorb heat from the steam circulation path, and the heat release channel of the heat pump system is used to release heat to the energy storage system; When in peak state, the heat absorption channels of the superheater, the evaporator and the preheater are used to absorb heat from the energy storage system in sequence, and the heat release channels of the preheater, the evaporator and the superheater are used to release heat to the steam circulation path in sequence.

2. According to claim 1, the peak load regulation system of a thermal power plant coupled with a heat pump energy storage is characterized in that: The heat absorption channel input end of the superheater is connected to the high temperature medium output end of the energy storage system, and the heat absorption channel input end of the evaporator is connected to the heat absorption channel output end of the superheater, the heat absorption channel input end of the preheater is connected to the heat absorption channel output end of the evaporator, and the heat absorption channel output end of the preheater is connected to the low temperature medium input end of the energy storage system; The heat release channel input end of the preheater is connected to the return water channel of the steam circulation channel, and the heat release channel input end of the evaporator is connected to the heat release channel output end of the preheater, the heat release channel input end of the superheater is connected to the heat release channel output end of the evaporator, and the heat release channel output end of the superheater is connected to the main steam channel of the steam circulation channel.

3. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 2, characterized in that: The heating system also includes: A reheater, wherein the heat absorption channel input end of the reheater is connected to the high-temperature medium output end of the energy storage system, and the heat absorption channel output end of the reheater is connected to the low-temperature medium input end of the energy storage system, the heat release channel input end of the reheater is connected to the return steam passage of the steam circulation passage, and the heat release channel output end of the reheater is connected to the reheat steam passage of the steam circulation passage.

4. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 3 is characterized in that: The thermal power system comprises: Boilers, high pressure cylinders, medium and low pressure cylinders and generators; Wherein, the high-pressure cylinder, the medium- and low-pressure cylinders and the generator are sequentially connected in transmission; The input end of the high-pressure cylinder is respectively connected to the output end of the main steam heating passage of the boiler and the output end of the heat release passage of the superheater, and the first output end of the high-pressure cylinder is respectively connected to the input end of the reheat steam heating passage of the boiler and the input end of the heat release passage of the reheater; The input ends of the medium and low pressure cylinders are respectively connected to the output ends of the reheat steam heating passage of the boiler and the output ends of the heat release passage of the reheater, and the first output ends of the medium and low pressure cylinders are respectively connected to the input ends of the main steam heating passage of the boiler and the input ends of the heat release passage of the preheater; When in peak load regulation mode, the heat absorption channel of the heat pump system is used to absorb heat from at least one of the boiler, the high pressure cylinder, and the medium and low pressure cylinders.

5. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 4 is characterized in that: The thermal power system further comprises: Condensers, low pressure heaters, deaerators and high pressure heaters; The input end of the condenser is connected to the first output end of the medium and low pressure cylinders, the output end of the condenser is connected to the input end of the heat absorption channel of the low pressure heater, and the input end of the heat release channel of the low pressure heater is connected to the second output end of the medium and low pressure cylinders; The input end of the deaerator is respectively connected to the output end of the heat absorption channel of the low-pressure heater, the output end of the heat release channel of the low-pressure heater and the third output end of the medium and low-pressure cylinders, and the output end of the deaerator is connected to the input end of the heat absorption channel of the high-pressure heater; The heat release channel input end of the high-pressure heater is connected to the second output end of the high-pressure cylinder, and the heat release channel output end and the heat absorption channel output end of the high-pressure heater are respectively connected to the main steam heating passage input end of the boiler and the heat release channel input end of the preheater.

6. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 2, characterized in that: The heating system also includes: A steam drum, wherein the steam drum is arranged between the heat release channel input end of the evaporator and the heat release channel output end of the preheater and between the heat release channel input end of the superheater and the heat release channel output end of the evaporator, the first input end of the steam drum is connected to the heat release channel output end of the preheater, the first output end of the steam drum is connected to the heat release channel input end of the evaporator, the second input end of the steam drum is connected to the heat release channel output end of the evaporator, and the second output end of the steam drum is connected to the heat release channel input end of the superheater.

7. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to any one of claims 1 to 6, characterized in that: The heat pump system comprises: Electric motor, shaft power transmission mechanism, compressor, expander, steam extraction heat exchanger and heat storage heat exchanger; Wherein, the motor, the compressor and the expander are sequentially connected by transmission, and the compressor and the thermal power system are connected by transmission through the shaft power transmission mechanism; The heat absorption channel of the extraction heat exchanger is used to absorb heat from the steam circulation passage, and the heat release channel input end of the extraction heat exchanger is connected to the output end of the expander, and the heat release channel output end of the extraction heat exchanger is connected to the input end of the compressor; The heat absorption channel input end of the heat storage heat exchanger is connected to the output end of the compressor, and the heat absorption channel output end of the heat storage heat exchanger is connected to the input end of the expander, the heat release channel input end of the heat storage heat exchanger is connected to the low-temperature medium output end of the energy storage system, and the heat release channel output end of the heat storage heat exchanger is connected to the high-temperature medium input end of the energy storage system.

8. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 7, characterized in that: The heat pump system further comprises: An ejector, wherein the first input end of the ejector is respectively connected to the main steam passage of the steam circulation passage, the high-pressure cylinder of the steam circulation passage, and the medium- and low-pressure cylinders of the steam circulation passage, and the output end of the ejector is connected to the input end of the heat absorption channel of the extraction heat exchanger, and the output end of the heat absorption channel of the extraction heat exchanger is connected to the input end of the condenser of the steam circulation passage.

9. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 8, characterized in that: The heat pump system further comprises: A temperature reduction and pressure reduction device, wherein the input end of the temperature reduction and pressure reduction device is connected to the output end of the heat absorption channel of the extraction heat exchanger, and the output end of the temperature reduction and pressure reduction device is connected to the input end of the deaerator of the steam circulation passage.

10. The peak load regulation system of a thermal power plant coupled with a heat pump energy storage according to claim 8, characterized in that: The heat pump system further comprises: A heat supply heat exchanger, wherein the heat absorption channel input end of the heat supply heat exchanger is connected to the heat absorption channel output end of the steam extraction heat exchanger, and the heat absorption channel output end of the heat supply heat exchanger is connected to the condenser output end of the steam circulation path, and the heat release channel of the heat supply heat exchanger is used to release heat to the heating system.

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