Thermal power deep peak shaving system and operation method thereof

Abstract

The invention discloses a thermal power deep peak shaving system and an operation method thereof. The thermal power deep peak shaving system comprises a boiler, a steam turbine generator unit, a water supply unit, a high-temperature molten salt tank, a low-temperature molten salt tank, a molten salt steam generator, a heat pump heat absorber, a heat pump heater, a high-pressure steam turbine, a medium-pressure steam turbine, a heat pump compressor and a heat pump expansion machine. A part of main steam shunted from the boiler enters the high-pressure steam turbine to do work, a part of hot reheat steam shunted from the boiler enters the medium-pressure steam turbine to do work, and the steam working by the medium-pressure steam turbine flows through the high-temperature side of the heat pump heat absorber to release heat; a circulating medium flowing out of the heat pump expansion machine flows through the heat pump heat absorber to absorb heat and then flows into the heat pump compressor; a circulating medium flowing out of the heat pump compressor firstly flows through the heat pump heater to release heat and then flows into the heat pump expansion machine; fused salt flowing out of the low-temperature fused salt tank flows through the heat pump heater to absorb heat and then flows into the high-temperature fused salt tank. The load of the coal-fired power generation unit can be reduced, and the electricity-electricity efficiency in the heat storage and release process is improved.

Description

Technical Field

[0001] The present invention relates to the field of thermal power and energy storage technology, and in particular to a thermal power deep peak regulation system and an operation method thereof. Background Art

[0002] Coal-fired power generation units are excellent peak-shaving units. With the increasing proportion of renewable energy installed capacity, the demand for deep peak-shaving retrofits for thermal power plants is increasing. The goal of deep peak-shaving retrofits is to reduce unit load to below 30%, or even to zero output, during periods of high renewable energy generation. However, currently, coal-fired unit loads can generally only be reduced to around 30%. Further reductions can lead to problems such as unstable boiler combustion and excessive pollutant emissions from incomplete combustion. Furthermore, unit efficiency is significantly reduced, impacting economic viability.

[0003] At present, the use of external molten salt energy storage technology to assist in achieving deep peak regulation of coal-fired power generation units with loads below 30% is one of the mainstream technologies. It mainly includes three technical routes, including: (1) Electric heating molten salt energy storage: Its principle is to directly convert the power load below 30% of the coal-fired power generation unit into the thermal energy of molten salt, thereby achieving deep peak regulation of the unit. The main problem of this route is the low power efficiency. (2) Steam heating molten salt energy storage: extract the main steam or reheated steam of the coal-fired power generation unit to heat the molten salt, thereby reducing the steam volume of the steam turbine and reducing the power generation of the unit. However, since most of the steam energy exists in the latent heat of condensation, the steam condensation temperature is generally not higher than 350℃, and the higher the pressure, the higher the condensation temperature. This also means that even if 550℃ steam is extracted, it is difficult to heat the molten salt temperature to above 400℃, resulting in a decrease in energy quality. (3) Flue gas heating molten salt: extract the flue gas of the coal-fired boiler in the coal-fired power generation unit to heat the molten salt, thereby reducing the steam generation of the coal-fired boiler and further reducing the power generation of the unit. This route can heat the molten salt to a higher temperature, but the heat transfer coefficient of the flue gas is small, which will lead to a larger size of the entire equipment and difficult to meet the conditions of the transformation site. Therefore, there is an urgent need for a high-efficiency deep peak-shaving technology for thermal power units that can reduce the load of the coal-fired power generation unit while ensuring the quality of the thermal energy of the energy storage system and improving the power efficiency during the heat storage and release process. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides a thermal power deep peak regulation system and an operation method thereof, which can reduce the load of the coal-fired power generation unit to zero output, ensure the quality of the thermal energy of the energy storage system, and improve the electrical efficiency during the heat storage and release process.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A thermal power deep peak regulation system, comprising a thermal power generation system and a molten salt heat storage system; the thermal power generation system comprises a boiler, a steam turbine generator set, and a water supply unit; the molten salt heat storage system comprises a high-temperature molten salt tank, a low-temperature molten salt tank, and a molten salt steam generator; and a heat pump system, comprising a heat pump heat absorber, a heat pump heater, a high-pressure steam turbine, an intermediate-pressure steam turbine, a heat pump compressor, and a heat pump expander; the high-pressure steam turbine, the intermediate-pressure steam turbine, and the heat pump compressor are coaxially arranged;

[0007] A portion of the main steam diverted from the thermal power generation system enters the high-pressure steam turbine to perform work and then returns to the thermal power generation system. A portion of the hot reheat steam diverted from the thermal power generation system enters the medium-pressure steam turbine to perform work. The steam that has performed work in the medium-pressure steam turbine first flows through the high-temperature side of the heat pump absorber to release heat and liquefy before returning to the thermal power generation system. The high-pressure steam turbine and the medium-pressure steam turbine jointly drive the heat pump compressor to operate;

[0008] The circulating medium flowing out of the heat pump expander first flows through the low-temperature side of the heat pump absorber to absorb heat before flowing into the heat pump compressor; the circulating medium flowing out of the heat pump compressor first flows through the high-temperature side of the heat pump heater to release heat before flowing into the heat pump expander;

[0009] The molten salt flowing out of the low-temperature molten salt tank flows through the low-temperature side of the heat pump heater to absorb heat and then flows into the high-temperature molten salt tank.

[0010] Furthermore, the cold reheat steam in the thermal power generation system is combined with the steam after it has performed work in the high-pressure steam turbine, and is heated by the boiler to generate hot reheat steam.

[0011] Furthermore, the steam that has performed work in the medium-pressure steam turbine releases heat through the heat pump absorber to become subcooled water, and then flows through the water supply unit and returns to the boiler.

[0012] Furthermore, the steam generated after the intermediate-pressure steam turbine performs work is also used to supply other heat users.

[0013] Furthermore, a condenser is connected between the steam turbine generator set and the water supply unit.

[0014] Furthermore, the water supply unit includes a high-pressure heater, a deaerator and a low-pressure heater.

[0015] Furthermore, the molten salt flowing out of the high-temperature molten salt tank flows through the high-temperature side of the molten salt steam generator to release heat and then flows into the low-temperature molten salt tank, and the feed water flows through the low-temperature side of the molten salt steam generator to absorb heat and generate reflux steam, which is used to be introduced into the steam turbine generator set to perform work when the load of the thermal power generation system is increased.

[0016] Furthermore, the feed water flowing through the molten salt steam generator is a portion of the feed water diverted from the water feed unit.

[0017] Furthermore, the circulating medium of the heat pump system includes air and / or argon and / or nitrogen and / or helium.

[0018] The present invention also provides an operating method for a thermal power deep peak regulation system, comprising:

[0019] Peak shaving stage: the thermal power generation system is reduced to the lowest economic load state for maintaining stable combustion operation, and the molten salt steam generator does not participate in the operation; further, a part of the main steam is diverted from the thermal power generation system to enter the high-pressure steam turbine to perform work and then return to the thermal power generation system, and a part of the hot reheat steam is diverted from the thermal power generation system to enter the medium-pressure steam turbine to perform work. The steam after performing work in the medium-pressure steam turbine first flows through the high-temperature side of the heat pump absorber to release heat and liquefy before returning to the thermal power generation system; the circulating medium flowing out of the heat pump expander first flows through the low-temperature side of the heat pump absorber to absorb heat and then flows into the heat pump compressor; the circulating medium flowing out of the heat pump compressor first flows through the high-temperature side of the heat pump heater to release heat and then flows into the heat pump expander; the molten salt flowing out of the low-temperature molten salt tank flows through the low-temperature side of the heat pump heater to absorb heat and then flows into the high-temperature molten salt tank, thereby using molten salt to store thermal energy;

[0020] Peak stage: the thermal power generation system gradually increases its load, and the heat pump system does not participate in the operation; the thermal power generation system gradually increases the amount of main steam and hot reheat steam to enter the steam turbine generator set to perform work, and at the same time, the molten salt flowing out of the high-temperature molten salt tank flows through the high-temperature side of the molten salt steam generator to release heat and then flows into the low-temperature molten salt tank, and the feed water flows through the low-temperature side of the molten salt steam generator to absorb heat to generate reflux steam and is used to be merged into the steam turbine generator set to perform work.

[0021] The beneficial effects of the present invention are as follows: the thermal power deep peak-shaving system provided by the present invention can significantly reduce the load of thermal power units, improve the operating efficiency of thermal power units, and has extremely high economic efficiency. The technical solution of the present invention uses a steam-driven heat pump to absorb steam latent heat for energy storage. This process converts all energy from thermal energy to thermal energy, and can ensure the quality of thermal energy in the heat storage system. The heat storage efficiency is very high, and the electrical efficiency of the heat storage and heat release process is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the system structure of an embodiment of the present invention.

[0023] In the above drawings: 1. Boiler; 2. Steam turbine generator set; 3. Condenser; 4. Condensate pump; 5. Low-pressure heater; 6. Deaerator; 7. Feedwater pump No. 1; 8. High-pressure heater; 9. Heat pump absorber; 10. High-pressure steam turbine; 11. Medium-pressure steam turbine; 12. Heat pump compressor; 13. Heat pump expander; 14. Heat pump heater; 15. High-temperature molten salt tank; 16. Low-temperature molten salt tank; 17. Molten salt steam generator; 18. Feedwater pump No. 2. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0025] A thermal power deep peak regulation system, the system structure is as follows Figure 1 As shown, it includes a thermal power generation system, a heat pump system and a molten salt heat storage system.

[0026] The thermal power generation system includes a boiler 1, a steam turbine generator set 2, a condenser 3, a condensate pump 4, and a water supply unit. In this embodiment, the water supply unit includes a high-pressure heater 8, a feedwater pump 7, a deaerator 6, and a low-pressure heater 5, which are connected in sequence. The high-pressure heater 8 is connected to the boiler 1.

[0027] The heat pump system includes a heat pump heat absorber 9, a high-pressure steam turbine 10, an intermediate-pressure steam turbine 11, a heat pump compressor 12, a heat pump expander 13, and a heat pump heater 14. The high-pressure steam turbine (10), the intermediate-pressure steam turbine (11), and the heat pump compressor (12) are coaxially arranged, and the heat pump expander (13) and the heat pump compressor (12) are also coaxially arranged. Furthermore, a heat pump cycle is performed between the heat pump heat absorber 9, the heat pump compressor 12, the heat pump expander 13, and the heat pump heater 14.

[0028] The molten salt heat storage system includes a No. 2 water feed pump 18 , a high-temperature molten salt tank 15 , a low-temperature molten salt tank 16 and a molten salt steam generator 17 .

[0029] Among them, the superheater steam outlet of boiler 1 is branched off and connected to the high-pressure cylinder steam inlet of the steam turbine in the steam turbine generator set 2, and the high-pressure cylinder steam outlet of the steam turbine in the steam turbine generator set 2 is connected to the reheater steam inlet of boiler 1; the reheater steam outlet of boiler 1 is branched off and connected to the intermediate-pressure cylinder steam inlet of the steam turbine in the steam turbine generator set 2, and the intermediate-pressure cylinder steam outlet of the steam turbine in the steam turbine generator set 2 is connected to the condenser 3, the condenser 3 is connected to the condensate pump 4, and the condensate pump 4 is connected to the water supply unit. In this embodiment, the condensate pump 4 is connected to the low-pressure heater 5.

[0030] The superheater steam outlet of the boiler 1 also branches out for connection with the steam inlet of the high-pressure steam turbine 10, and the steam outlet of the high-pressure steam turbine 10 is connected to the steam inlet of the reheater of the boiler 1; the reheater steam outlet of the boiler 1 also branches out for connection with the steam inlet of the medium-pressure steam turbine 11, and the steam outlet of the medium-pressure steam turbine 11 is connected to the heat pump absorber 9, and the heat pump absorber 9 is connected to the water supply unit. In this embodiment, the heat pump absorber 9 is connected to the deaerator 6.

[0031] The low-temperature molten salt tank 16 is connected to the heat pump heater 14, which is in turn connected to the high-temperature molten salt tank 15. The molten salt flowing out of the low-temperature molten salt tank 16 flows through the low-temperature side of the heat pump heater 14 to absorb heat before flowing into the high-temperature molten salt tank 15. The high-temperature molten salt tank 15 is connected to the molten salt steam generator 17, which is in turn connected to the low-temperature molten salt tank 16. The molten salt flowing out of the high-temperature molten salt tank 15 flows through the high-temperature side of the molten salt steam generator 17 to release heat before flowing into the low-temperature molten salt tank 16. In this embodiment, the deaerator 6 is also connected to the No. 2 feedwater pump 18, which is in turn connected to the molten salt steam generator 17. The steam outlet of the molten salt steam generator 17 is connected to the high-pressure and intermediate-pressure steam inlets of the steam turbine in the steam turbine generator set 2. The steam generated in the molten salt steam generator 17 enters the steam turbine generator set 2 to perform work.

[0032] A portion of the main steam generated by the superheater of the boiler 1 in the thermal power generation system enters the high-pressure steam turbine 10 to perform work, and a portion of the hot reheated steam generated by the reheater of the boiler 1 in the thermal power generation system enters the medium-pressure steam turbine 11 to perform work. The steam after the medium-pressure steam turbine 11 has performed work first flows through the high-temperature side of the heat pump absorber 9 to release heat and liquefy before returning to the thermal power generation system. The high-pressure steam turbine 10 and the medium-pressure steam turbine 11 jointly drive the heat pump compressor 12 and the heat pump expander 13 to operate; the circulating medium of the heat pump system includes air and / or argon and / or nitrogen and / or helium, and the circulating medium of the heat pump system heats the molten salt through the heat pump heater 14.

[0033] In the thermal power generation system, the cold reheat steam generated by the steam turbine generator set 2 is combined with the steam that has been processed by the high-pressure steam turbine 10, and then absorbed by the boiler 1 to produce hot reheat steam. The steam generated by the steam turbine generator set 2 can also be passed into the condenser 3. After passing through the condenser 3 and the condensate pump 4, the steam flows through the low-pressure heater 5, the deaerator 6, the No. 1 feedwater pump 7, and the high-pressure heater 8, and is ultimately recovered by the boiler 1. The steam generated by the intermediate-pressure steam turbine 11 absorbs heat in the heat pump heat absorber 9, becoming subcooled water. The steam then flows through the deaerator 6, the No. 1 feedwater pump 7, and the high-pressure heater 8 in the feedwater unit, and is ultimately recovered by the boiler 1. Furthermore, the steam generated by the intermediate-pressure steam turbine 11 is used to heat water in the feedwater unit and can be supplied to other heat users, providing steam to external users or heating cold water for external heating or hot water supply. The No. 2 feedwater pump 18 connects the feedwater unit and the molten salt steam generator 17; the feedwater flows through the low-temperature side of the molten salt steam generator 17 to absorb heat and generate reflux steam, which is used to flow into the steam turbine generator set to perform work when the thermal power generation system increases load.

[0034] In this embodiment,

[0035] The main parameters of each device in the heat pump system are:

[0036] (I) The steam at the inlet of the high-pressure steam turbine 10 is the steam diverted from the steam outlet of the superheater of the boiler 1, and its temperature ranges from 300 to 650°C; the steam at the outlet of the high-pressure steam turbine 10 has a temperature range from 200 to 350°C;

[0037] (II) The steam at the inlet of the medium-pressure steam turbine 11 is the steam diverted from the outlet of the reheater of the boiler 1, and its temperature ranges from 300 to 650°C. The steam at the outlet of the medium-pressure steam turbine 11 has a temperature range from 100 to 350°C.

[0038] (III) The steam at the inlet of the heat pump absorber 9 is steam after work from the medium-pressure steam turbine 11, and its temperature range is 100-350°C, and the temperature range of the subcooled water at the outlet of the heat pump absorber 9 is 50-250°C;

[0039] (IV) When the heat pump heater 14 heats the molten salt, the temperature range of the molten salt at the inlet of the heat pump heater 14 is 150-400° C., and the temperature range of the molten salt at the outlet of the heat pump heater 14 is 400-700° C.;

[0040] (V) When the circulating medium of the heat pump system heats the molten salt through the heat pump heater 14, the inlet circulating medium temperature range of the heat pump heater 14 is 410-720°C, and the outlet circulating medium temperature range of the heat pump heater 14 is 160-450°C.

[0041] The main parameters of the steam at the outlet of the molten salt steam generator 17 are:

[0042] (I) The outlet steam temperature of the molten salt steam generator 17 is in the range of 300-650°C.

[0043] The operation method of the thermal power deep peak regulation system in this application includes the following stages:

[0044] Peak shaving stage: the unit load of the thermal power generation system is reduced to the minimum economic load for maintaining stable combustion operation, and the molten salt steam generator 17 does not participate in the operation; further, a part of the main steam is diverted from the thermal power generation system to enter the high-pressure steam turbine 10 to perform work and then returned to the thermal power generation system, and a part of the hot reheat steam is diverted from the thermal power generation system to enter the medium-pressure steam turbine 11 to perform work. The steam after performing work in the medium-pressure steam turbine 11 first flows through the high-temperature side of the heat pump absorber 9 to release heat and liquefy before returning to the thermal power generation system; in addition, the steam after performing work in the medium-pressure steam turbine 11 is also used to supply other heat users or to heat water in the water supply unit. The circulating medium flowing out of the heat pump expander 13 first flows through the low-temperature side of the heat pump heat absorber 9 to absorb heat before flowing into the heat pump compressor 12; the circulating medium flowing out of the heat pump compressor 12 first flows through the high-temperature side of the heat pump heater 14 to release heat before flowing into the heat pump expander 13; the molten salt flowing out of the low-temperature molten salt tank 16 flows through the low-temperature side of the heat pump heater 14 to absorb heat before flowing into the high-temperature molten salt tank 15, thereby using the molten salt to store thermal energy;

[0045] Peak stage: The thermal power generation system gradually increases its load, and the heat pump system does not participate in the operation; the thermal power generation system gradually increases the amount of main steam and hot reheat steam to enter the steam turbine generator set to perform work, and at the same time, the molten salt flowing out of the high-temperature molten salt tank 15 flows through the high-temperature side of the molten salt steam generator 17 to release heat and then flows into the low-temperature molten salt tank 16, and the feed water flows through the low-temperature side of the molten salt steam generator 17 to absorb heat to generate reflux steam and is used to be introduced into the steam turbine generator set to perform work.

[0046] On the one hand, for purely electrically heated molten salt energy storage technology, it simply consumes electricity, which is converted from heat energy, resulting in a very low thermoelectric efficiency, no more than 45%. After the molten salt heat storage system releases heat to generate steam, it then generates electricity, and the thermoelectric efficiency is lower than 45%. Therefore, the electrical efficiency of purely electrically heated molten salt energy storage technology is generally no more than 25%. On the other hand, for purely steam-heated molten salt energy storage technology, since most of the steam energy exists in the latent heat of condensation, the steam condensation temperature is generally no more than 350°C, and the higher the pressure, the higher the condensation temperature. Therefore, when steam heats the molten salt, the heating temperature is concentrated in the condensation temperature range, resulting in the molten salt heat storage temperature not exceeding 400°C. The steam temperature is low during heat release, the steam power generation efficiency is low, and the electrical efficiency is reduced. In contrast, the technical solution of the present invention uses a steam-driven heat pump to absorb the steam latent heat for energy storage. In this process, the energy is converted from thermal energy to thermal energy, and the quality of the thermal energy in the heat storage system is guaranteed. The heat storage efficiency is very high, and the electrical efficiency of the heat storage and heat release process is improved.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A thermal power deep peak regulation system, comprising a thermal power generation system and a molten salt heat storage system; the thermal power generation system comprises a boiler (1), a steam turbine generator set (2) and a water supply unit, and the molten salt heat storage system comprises a high-temperature molten salt tank (15), a low-temperature molten salt tank (16) and a molten salt steam generator (17), characterized in that: The heat pump system further comprises a heat pump heat absorber (9), a heat pump heater (14), a high-pressure steam turbine (10), an intermediate-pressure steam turbine (11), a heat pump compressor (12), and a heat pump expander (13); the high-pressure steam turbine (10), the intermediate-pressure steam turbine (11), and the heat pump compressor (12) are coaxially arranged; A portion of the main steam diverted from the thermal power generation system enters the high-pressure steam turbine (10) to perform work and then returns to the thermal power generation system; a portion of the hot reheat steam diverted from the thermal power generation system enters the medium-pressure steam turbine (11) to perform work; the steam that has performed work in the medium-pressure steam turbine (11) first flows through the high-temperature side of the heat pump absorber (9) to release heat and liquefy and then returns to the thermal power generation system; the high-pressure steam turbine (10) and the medium-pressure steam turbine (11) jointly drive the heat pump compressor (12) to operate; The circulating medium flowing out of the heat pump expander (13) first flows through the low-temperature side of the heat pump absorber (9) to absorb heat and then flows into the heat pump compressor (12); the circulating medium flowing out of the heat pump compressor (12) first flows through the high-temperature side of the heat pump heater (14) to release heat and then flows into the heat pump expander (13); The molten salt flowing out of the low-temperature molten salt tank (16) flows through the low-temperature side of the heat pump heater (14) to absorb heat and then flows into the high-temperature molten salt tank (15).

2. A thermal power deep peak regulation system according to claim 1, characterized in that: The cold reheat steam in the thermal power generation system is combined with the steam after it has done work in the high-pressure steam turbine (10), and is heated by the boiler (1) to generate hot reheat steam.

3. The thermal power deep peak regulation system according to claim 1, characterized in that: The steam that has performed work in the medium-pressure steam turbine (11) releases heat through the heat pump absorber (9) and becomes subcooled water, and then flows through the water supply unit and returns to the boiler (1).

4. The thermal power deep peak regulation system according to claim 1, characterized in that: The steam after the medium-pressure steam turbine (11) has performed work is also used to supply other heat users.

5. The thermal power deep peak regulation system according to claim 1, characterized in that: A condenser (3) is connected between the steam turbine generator set (2) and the water supply unit.

6. A thermal power deep peak regulation system according to any one of claims 1 to 5, characterized in that: The water supply unit comprises a high-pressure heater (8), a deaerator (6) and a low-pressure heater (5).

7. The thermal power deep peak regulation system according to claim 1, characterized in that: The molten salt flowing out of the high-temperature molten salt tank (15) flows through the high-temperature side of the molten salt steam generator (17) to release heat and then flows into the low-temperature molten salt tank (16). The feed water flows through the low-temperature side of the molten salt steam generator (17) to absorb heat and generate reflux steam, which is used to flow into the steam turbine generator set to perform work when the load of the thermal power generation system is increased.

8. The thermal power deep peak regulation system according to claim 7, characterized in that: The feed water flowing through the molten salt steam generator (17) is a portion of the feed water diverted from the water supply unit.

9. The thermal power deep peak regulation system according to claim 1, characterized in that: The circulating medium of the heat pump system includes air and / or argon and / or nitrogen and / or helium.

10. An operating method of a thermal power deep peak regulation system according to any one of claims 1 to 9, characterized in that: Peak load regulation stage: the thermal power generation system is reduced to the lowest economic load state for maintaining stable combustion operation, and the molten salt steam generator (17) does not participate in the operation; further, a part of the main steam is diverted from the thermal power generation system to enter the high-pressure steam turbine (10) to do work and then returned to the thermal power generation system, and a part of the hot reheat steam is diverted from the thermal power generation system to enter the medium-pressure steam turbine (11) to do work, and the steam after doing work in the medium-pressure steam turbine (11) first flows through the high-temperature side of the heat pump absorber (9) to release heat and liquefy before returning to the Thermal power generation system; the circulating medium flowing out of the heat pump expander (13) first flows through the low-temperature side of the heat pump heat absorber (9) to absorb heat and then flows into the heat pump compressor (12); the circulating medium flowing out of the heat pump compressor (12) first flows through the high-temperature side of the heat pump heater (14) to release heat and then flows into the heat pump expander (13); the molten salt flowing out of the low-temperature molten salt tank (16) flows through the low-temperature side of the heat pump heater (14) to absorb heat and then flows into the high-temperature molten salt tank (15), thereby utilizing the molten salt for thermal energy storage; Peak stage: the thermal power generation system gradually increases the load, and the heat pump system does not participate in the operation; the thermal power generation system gradually increases the steam volume of main steam and hot reheat steam to enter the steam turbine generator set to perform work, and at the same time, the molten salt flowing out of the high-temperature molten salt tank (15) flows through the high-temperature side of the molten salt steam generator (17) to release heat and then flows into the low-temperature molten salt tank (16), and the feed water flows through the low-temperature side of the molten salt steam generator (17) to absorb heat to generate reflux steam and is used to be merged into the steam turbine generator set to perform work.

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