Thermal power plant coupling steam ejector and multi-heat-source fused salt heat storage steam supply system

Abstract

The invention belongs to the technical field of thermal power generating unit steam supply, and particularly discloses a thermal power plant coupling steam ejector and multi-heat-source fused salt heat storage steam supply system which comprises a thermal power generating unit body, a fused salt heat storage system and a steam supply system. And main steam and flue gas are used as heat sources for combined heat storage, on one hand, the main steam after heat release is used for extracting steam to supply low-parameter industrial steam, on the other hand, fused salt is used for storing heat to generate steam to eject a steam turbine intermediate-pressure cylinder to exhaust steam, and therefore high-parameter industrial steam is supplied, and the energy consumption is reduced. And peak regulation and heat supply tasks of the thermal power plant are synchronously met. According to the system, the deep peak regulation and industrial steam supply capacity of the thermal power generating unit is greatly improved, different steam supply parameter requirements can be met by adjusting parameters of the fused salt heat storage system and the structure of the ejector, flexible regulation and control of industrial steam supply of the thermal power generating unit are achieved, and the problems of a thermal power plant in the aspects of heat storage, peak regulation and steam supply are solved.

Description

Technical Field

[0001] This invention belongs to the field of steam supply technology for thermal power units, specifically relating to a steam supply system for thermal power plants that couples steam ejectors with multi-heat source molten salt thermal storage. Background Technology

[0002] Renewable energy power generation, which does not produce greenhouse gases during its production process, helps mitigate global warming and has become a major trend in the global energy structure transformation. However, renewable energy power generation is characterized by its spatiotemporal discontinuity, instability, and unpredictability, which can easily impact the power grid. To improve the absorption of renewable energy, thermal power units, as the main peak-shaving power source in the current energy system, need to undergo flexibility upgrades to enhance their deep peak-shaving capabilities and ensure their heating capacity.

[0003] Steam ejectors can utilize the excess energy stored in thermal power units during peak shaving and frequency regulation, or the exhaust steam generated by the units, to drive low-grade steam or water with relatively high-grade steam, thereby avoiding energy waste and paving a new path for the energy-saving transformation of thermal power units. However, during deep peak shaving of the units, the significant drop in extraction steam parameters may cause the operating parameters of the steam ejector to fall below the critical value, thus preventing it from being put into operation.

[0004] Molten salt thermal energy storage technology can change the spatial and temporal distribution of energy, significantly improve the peak-shaving capacity and flexibility of thermal power units, and has advantages such as large thermal storage capacity, low cost and strong stability. It has been widely used in nuclear power and solar power generation, and is also considered a potential way to modify the flexibility of thermal power units.

[0005] Current research on coupled molten salt thermal energy storage systems for thermal power units has yielded various configurations, demonstrating that such systems can enhance the deep peak-shaving capability and flexibility of these units. However, the large temperature difference during the phase change of steam heat sources leads to low heat exchange efficiency and easily causes thermal imbalance on the boiler heating surfaces, placing high demands on boiler-turbine coordination control. Electric heating can achieve near-zero turbine output, but its varnish loss rate is as high as 40%, with electric heaters accounting for over 65% of the varnish loss, resulting in significant energy waste. Flue gas in the boiler serves as a good heat source, maintaining temperatures as high as 650-800℃ even at low loads, which can significantly improve the performance of the thermal energy storage system. However, pure flue gas thermal energy storage cannot reduce the minimum power load of the thermal power unit. Therefore, it is still necessary to find a new configuration for coupled molten salt thermal energy storage systems in thermal power units that can simultaneously maintain boiler thermal balance and reduce the minimum power load of the unit. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention aims to provide a steam supply system for thermal power plants that couples steam ejectors with multi-heat source molten salt thermal storage. This system reduces the minimum power load of the unit by extracting main steam, while simultaneously matching an appropriate amount of diverted flue gas to avoid thermal imbalance on the boiler reheater heating surface. It utilizes both main steam and flue gas as heat sources for combined thermal storage. When there is industrial steam demand, on the one hand, low-parameter industrial steam is supplied by extracting steam from the main steam after heat release; on the other hand, high-parameter steam is generated by heating the deaerator bypass feedwater with high-temperature molten salt. This superheated steam is then used to eject exhaust steam from the intermediate-pressure cylinder of the steam turbine, thereby supplying high-parameter industrial steam. This simultaneously improves the unit's deep peak-shaving capacity and the level of industrial steam supply.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A steam supply system for a thermal power plant that couples a steam ejector with a multi-heat source molten salt thermal storage includes a thermal power unit body, a molten salt thermal storage system, and a steam supply system.

[0009] The thermal power unit body includes a power generation system and a regenerative system. The power generation system includes a superheater, a high-pressure cylinder of a steam turbine, a reheater, an intermediate-pressure cylinder of a steam turbine, a low-pressure cylinder of a steam turbine, and a generator connected in sequence. The regenerative system includes a condenser, a condensate pump, a low-pressure regenerative heater, a deaerator, a first feedwater pump, and a high-pressure regenerative heater connected in sequence.

[0010] The molten salt thermal storage system includes a flue gas / molten salt heat exchanger, a high-temperature molten salt tank, a steam / molten salt heat exchanger, a low-temperature molten salt tank, a first low-temperature molten salt pump, a second low-temperature molten salt pump, a first circulation pump, a high-temperature molten salt pump, a second circulation pump, a main steam regulating valve, and first to fifth molten salt regulating valves.

[0011] The steam supply system includes a molten salt / feedwater heat exchanger, a steam ejector, an industrial user, a second feedwater pump, first to second regulating valves, third to sixth regulating valves, and a pressure reducing valve;

[0012] The steam-side inlet of the steam / molten salt heat exchanger is connected to the main steam pipeline of the boiler via the main steam regulating valve, which regulates the main steam flow rate entering the molten salt heat storage system. The outlet of the low-temperature molten salt tank is divided into two paths: one path connects to the inlet of the first circulating pump via the first low-temperature molten salt pump, the first molten salt regulating valve, and the flue gas / molten salt heat exchanger; the other path connects to the inlet of the first circulating pump via the second low-temperature molten salt pump, the second molten salt regulating valve, the steam / molten salt heat exchanger, and the third molten salt regulating valve. The outlet of the first circulating pump connects to the inlet of the high-temperature molten salt tank. Molten salt from both paths is sent into the high-temperature molten salt tank for storage via the first circulating pump. The outlet of the high-temperature molten salt tank is connected to the inlet of the low-temperature molten salt tank via the fourth molten salt regulating valve, the high-temperature molten salt pump, the molten salt / feedwater heat exchanger, the fifth molten salt regulating valve, and the second circulating pump. After releasing heat in the molten salt / feedwater heat exchanger, the high-temperature molten salt is sent back to the low-temperature molten salt tank.

[0013] The industrial steam supply is divided into two types: low-parameter industrial steam and high-parameter industrial steam. The main steam flow rate entering the steam / molten salt heat exchanger is controlled by the main steam regulating valve. After heat release, the main steam is extracted and sent to industrial users via the first regulating valve to supply low-parameter industrial steam. The feedwater outlet of the deaerator bypasses the second feedwater pump and the third regulating valve and enters the molten salt / feedwater heat exchanger to be heated into high-parameter superheated steam. Then, the flow rate is regulated by the fourth regulating valve and sent to the high-pressure inlet of the steam ejector. Part of the exhaust steam from the intermediate-pressure cylinder of the steam turbine enters the low-pressure inlet of the steam ejector through the fifth regulating valve. Thus, the steam generated by the molten salt is used to eject the exhaust steam from the intermediate-pressure cylinder of the steam turbine. The mixed steam at the outlet of the steam ejector is sent to industrial users via the sixth regulating valve to supply high-parameter industrial steam. After the industrial steam supplied to industrial users is used up, it is depressurized by the pressure reducing valve and then sent to the condenser.

[0014] The molten salt in the molten salt thermal storage system is a binary molten salt of 60% sodium nitrate and 40% potassium nitrate or a ternary mixed nitrate of 53% potassium nitrate, 40% sodium nitrite and 7% sodium nitrate. The temperature of the molten salt is controlled to remain within its operating temperature throughout the entire heat exchange process by setting a differential temperature at the heat exchanger terminals, thereby avoiding safety risks and energy waste.

[0015] The flue gas / molten salt heat exchanger is located in the boiler's tail flue; the superheater and reheater are located within the boiler. The extraction of main steam reduces the flow rate through the turbine's high-pressure cylinder, thereby decreasing the amount of working fluid entering the boiler's reheater heating surface, altering the heat absorption ratio, and posing a risk of reheater overheating. To prevent reheater overheating, a flue gas / molten salt heat exchanger is installed in the boiler's tail flue to divert flue gas for heat storage, preventing thermal imbalance in the reheater and maintaining normal boiler operation.

[0016] The steam ejector is an adjustable ejector with an adjustable high-pressure nozzle and a mixing chamber throat area. The flow rate of the working steam at the high-pressure inlet and the flow rate of the ejector steam at the low-pressure inlet are adjusted by the fourth and fifth regulating valves, respectively. According to the demand for industrial steam, the main structural parameters of the steam ejector and the working / ejector fluid flow rate are adjusted to maintain a high ejection ratio and meet the parameter requirements for industrial steam.

[0017] The high-pressure inlet working steam of the steam ejector is high-parameter superheated steam generated by the bypass feedwater of the high-temperature molten salt heated deaerator, and the low-pressure inlet ejector steam is the exhaust steam of the intermediate-pressure cylinder of the steam turbine.

[0018] The steam ejector needs to be designed and calculated based on the parameters of the high-pressure inlet working steam, the low-pressure inlet ejector steam, and the actual industrial steam, in order to determine its key structural parameters.

[0019] The high-pressure inlet working steam parameters of the steam ejector can be flexibly adjusted by changing the temperature, pressure, flow rate of the molten salt thermal storage system and the temperature difference at the heat exchanger terminals.

[0020] The maximum extraction rate of the main steam is limited by the minimum cooling flow rate of the low-pressure cylinder of the turbine to ensure the safe operation of the turbine.

[0021] The industrial steam supply comes from thermal power units and needs to be depressurized by a pressure reducing valve before being returned to the condenser inlet.

[0022] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention develops a multi-source molten salt thermal storage technology that uses steam and flue gas as heat sources for combined thermal storage, and proposes a novel industrial steam supply system for thermal power units based on steam ejector technology. The system reduces the minimum power load of the unit by extracting main steam and matches an appropriate flue gas flow rate to avoid thermal imbalance on the boiler reheater heating surface. It utilizes main steam and flue gas as heat sources for combined thermal storage. On the one hand, it uses the released heat from the main steam to extract low-parameter industrial steam; on the other hand, it uses steam generated from molten salt thermal storage to eject exhaust steam from the intermediate-pressure cylinder of the steam turbine, thereby supplying high-parameter industrial steam, simultaneously meeting the peak-shaving and heating tasks of thermal power plants. This invention significantly improves the deep peak-shaving and industrial steam supply capabilities of thermal power units. It can meet different steam supply parameter requirements by adjusting the parameters of the thermal storage system and the structure of the ejector, realizing flexible control of industrial steam supply for thermal power units and solving the problems existing in thermal storage, peak-shaving, and steam supply in thermal power plants. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a steam supply system for a thermal power plant that couples a steam ejector with multiple heat sources and molten salt thermal storage, as proposed in this invention.

[0024] The numbers in the diagram correspond to: 1. Boiler; 2. Superheater; 3. Reheater; 4. Flue gas / molten salt heat exchanger; 5. High-pressure cylinder of steam turbine; 6. Intermediate-pressure cylinder of steam turbine; 7. Low-pressure cylinder of steam turbine; 8. Generator; 9. Deaerator; 10. Condenser; 11. Low-pressure regenerative heater; 12. High-pressure regenerative heater; 13. High-temperature molten salt tank; 14. Steam / molten salt heat exchanger; 15. Low-temperature molten salt tank; 16. Molten salt / feedwater heat exchanger; 17. Steam ejector; 18. Industrial user; 19. First feedwater pump; 20. Second feedwater pump; 2 1. Condensate pump; 22. First cryogenic molten salt pump; 23. Second cryogenic molten salt pump; 24. First circulating pump; 25. High-temperature molten salt pump; 26. Second circulating pump; 27. Main steam regulating valve; 28. First regulating valve; 29. ​​Second regulating valve; 30. First molten salt regulating valve; 31. Second molten salt regulating valve; 32. Third molten salt regulating valve; 33. Fourth molten salt regulating valve; 34. Fifth molten salt regulating valve; 35. Third regulating valve; 36. Fourth regulating valve; 37. Fifth regulating valve; 38. Sixth regulating valve; 39. Pressure reducing valve. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] like Figure 1 The diagram shows a steam supply system for a thermal power plant that couples a steam ejector with a multi-heat source molten salt thermal storage system, including the thermal power unit body, the molten salt thermal storage system, and the steam supply system.

[0027] The thermal power unit mainly involves a power generation system and a regenerative system. The power generation system includes a superheater 2, a high-pressure turbine cylinder 5, a reheater 3, a medium-pressure turbine cylinder 6, a low-pressure turbine cylinder 7, and a generator 8 connected in sequence. The regenerative system includes a condenser 10, a condensate pump 21, a low-pressure regenerative heater 11, a deaerator 9, a first feedwater pump 19, and a high-pressure regenerative heater 12 connected in sequence. The main steam pipe of boiler 1 is connected to the steam inlet of high-pressure cylinder 5 of steam turbine and the steam-side inlet of steam / molten salt heat exchanger 14. The extraction port and exhaust port of high-pressure cylinder 5 of steam turbine are connected to the extraction pipe of high-pressure regenerative heater 12 and the inlet of reheater 3, respectively. The outlet of reheater 3 is connected to the steam inlet of intermediate-pressure cylinder 6 of steam turbine. The extraction port of intermediate-pressure cylinder 6 of steam turbine is connected to high-pressure regenerative heater 12. The exhaust port of intermediate-pressure cylinder 6 of steam turbine is connected to the steam inlet of low-pressure cylinder 7 of steam turbine and the low-pressure inlet of steam ejector 17, respectively. The shaft of low-pressure cylinder 7 of steam turbine is connected to generator 8. The extraction port of low-pressure cylinder 7 of steam turbine is connected to low-pressure regenerative heater 14. The extraction steam pipe of the heat heater 11 is connected to the exhaust port of the low-pressure cylinder 7 of the steam turbine, the drain outlet of the low-pressure regenerative heater 11, and the industrial exhaust steam outlet of the industrial user 18. The outlet of the condenser 10 is connected to the inlet of the deaerator 9 via the condensate pump 21 and the low-pressure regenerative heater 11. The inlet of the deaerator 9 is connected to the extraction steam port of the intermediate-pressure cylinder 6 of the steam turbine, the drain pipe of the high-pressure regenerative heater 12, and the feedwater pipe of the low-pressure regenerative heater 11. The outlet of the deaerator 9 is connected to the inlet of the superheater 2 via the first feedwater pump 19 and the high-pressure regenerative heater 12. The outlet of the superheater 2 is the main steam.

[0028] The molten salt thermal storage system includes a flue gas / molten salt heat exchanger 4, a high-temperature molten salt tank 13, a steam / molten salt heat exchanger 14, a low-temperature molten salt tank 15, a first low-temperature molten salt pump 22, a second low-temperature molten salt pump 23, a first circulation pump 24, a high-temperature molten salt pump 25, a second circulation pump 26, a main steam regulating valve 27, and first to fifth molten salt regulating valves 30-34. The steam-side inlet of the steam / molten salt heat exchanger 14 is connected to the main steam pipeline of boiler 1 via the main steam regulating valve 27, which regulates the main steam flow entering the molten salt thermal storage system. The outlet of the low-temperature molten salt tank 15 is divided into two paths: one path connects to the inlet of the first circulation pump 24 via the first low-temperature molten salt pump 22, the first molten salt regulating valve 30, and the flue gas / molten salt heat exchanger 4; the other path connects to the inlet of the second low-temperature molten salt pump 23, the second molten salt regulating valve 31, the steam / molten salt heat exchanger 14, and the third molten salt regulating valve. 32 connects to the inlet of the first circulation pump 24, and the outlet of the first circulation pump 24 connects to the inlet of the high-temperature molten salt tank 13. The two streams of molten salt are sent into the high-temperature molten salt tank 13 for storage through the first circulation pump 24. The outlet of the high-temperature molten salt tank 13 is connected to the inlet of the low-temperature molten salt tank 15 through the fourth molten salt regulating valve 33, the high-temperature molten salt pump 25, the molten salt / feed water heat exchanger 16, the fifth molten salt regulating valve 34, and the second circulation pump 26. After releasing heat in the molten salt / feed water heat exchanger 16, the high-temperature molten salt is sent back to the low-temperature molten salt tank 15.

[0029] The steam supply system includes a molten salt / feedwater heat exchanger 16, a steam ejector 17, an industrial user 18, a second feedwater pump 20, first to second regulating valves 28-29, third to sixth regulating valves 35-38, and a pressure reducing valve 39. The industrial steam supply is divided into low-parameter industrial steam and high-parameter industrial steam. The main steam flow rate entering the steam / molten salt heat exchanger 14 is controlled by the main steam regulating valve 27. After heat release, the main steam is extracted and sent to the industrial user 18 via the first regulating valve 28 to supply low-parameter industrial steam. The bypass feedwater from the deaerator 9 outlet enters the molten salt / feedwater heat exchanger 16 via the second feedwater pump 20 and the third regulating valve 35, where it is heated to become high-parameter superheated steam. Then, the flow rate is regulated by the fourth regulating valve 36 before being sent to the high-parameter superheated steam ejector 17. At the low-pressure inlet, part of the exhaust steam from the intermediate-pressure cylinder 6 of the steam turbine enters the low-pressure inlet of the steam ejector 17 through the fifth regulating valve 37. This allows the molten salt to be used to generate steam to eject the exhaust steam from the intermediate-pressure cylinder 6 of the steam turbine. The specific flow rates of the working steam and the ejector steam are obtained based on the ejection ratio calculated in the design of the steam ejector. The mixed steam at the outlet of the steam ejector 17 is sent to the industrial user 18 via the sixth regulating valve 38 to supply high-parameter industrial steam. After the industrial steam supplied to the industrial user 18 is used up, it is depressurized by the pressure reducing valve 39 and then sent to the condenser 10.

[0030] The system can broaden the deep peak-shaving range of thermal power units, and at the same time, it can meet different steam supply parameter requirements by adjusting the parameters of the thermal storage system and the structure of the injector. It realizes flexible control of industrial steam supply of thermal power units, adapts to the steam needs of industrial users in different scenarios, and has considerable application prospects.

Claims

1. A steam supply system for a thermal power plant that couples a steam ejector with a multi-heat source molten salt thermal storage, characterized in that, This includes the thermal power unit itself, the molten salt thermal storage system, and the steam supply system; The thermal power unit body includes a power generation system and a regenerative system. The power generation system includes a superheater (2), a high-pressure cylinder of a steam turbine (5), a reheater (3), an intermediate-pressure cylinder of a steam turbine (6), a low-pressure cylinder of a steam turbine (7), and a generator (8) connected in sequence. The regenerative system includes a condenser (10), a condensate pump (21), a low-pressure regenerative heater (11), a deaerator (9), a first feedwater pump (19), and a high-pressure regenerative heater (12) connected in sequence. The molten salt thermal storage system includes a flue gas / molten salt heat exchanger (4), a high-temperature molten salt tank (13), a steam / molten salt heat exchanger (14), a low-temperature molten salt tank (15), a first low-temperature molten salt pump (22), a second low-temperature molten salt pump (23), a first circulation pump (24), a high-temperature molten salt pump (25), a second circulation pump (26), a main steam regulating valve (27), and first to fifth molten salt regulating valves (30) to (34). The steam supply system includes a molten salt / feed water heat exchanger (16), a steam ejector (17), an industrial user (18), a second feed water pump (20), first to second regulating valves (28)~(29), third to sixth regulating valves (35)~(38), and a pressure reducing valve (39); The steam-side inlet of the steam / molten salt heat exchanger (14) is connected to the main steam pipeline of the boiler (1) via the main steam regulating valve (27), and the main steam flow rate entering the molten salt heat storage system is regulated by the main steam regulating valve (27); the outlet of the low-temperature molten salt tank (15) is divided into two paths, one path is connected to the inlet of the first circulating pump (24) via the first low-temperature molten salt pump (22), the first molten salt regulating valve (30) and the flue gas / molten salt heat exchanger (4), and the other path is connected to the inlet of the second circulating pump (24) via the second low-temperature molten salt pump (23), the second molten salt regulating valve (31), the steam / molten salt heat exchanger (14) and the third molten salt regulating valve (31). 32) The inlet of the first circulation pump (24) is connected to the inlet of the high-temperature molten salt tank (13), and the outlet of the first circulation pump (24) is connected to the inlet of the high-temperature molten salt tank (13). The two molten salts are sent into the high-temperature molten salt tank for storage through the first circulation pump (24). The outlet of the high-temperature molten salt tank (13) is connected to the inlet of the low-temperature molten salt tank (15) through the fourth molten salt regulating valve (33), the high-temperature molten salt pump (25), the molten salt / feed water heat exchanger (16), the fifth molten salt regulating valve (34), and the second circulation pump (26). The high-temperature molten salt is sent back to the low-temperature molten salt tank (15) after releasing heat in the molten salt / feed water heat exchanger (16). The industrial steam supply is divided into two types: low-parameter industrial steam and high-parameter industrial steam. The main steam flow rate entering the steam / molten salt heat exchanger (14) is controlled by the main steam regulating valve (27). After heat release, the main steam is extracted and sent to the industrial user (18) via the first regulating valve (28) to supply low-parameter industrial steam. The feedwater outlet of the deaerator (9) bypasses the second feedwater pump (20) and the third regulating valve (35) and enters the molten salt / feedwater heat exchanger (16) to be heated into high-parameter superheated steam. Then, the flow rate is regulated by the fourth regulating valve (36). The flow rate is then fed into the high-pressure inlet of the steam ejector (17). Part of the exhaust steam from the intermediate-pressure cylinder (6) of the steam turbine enters the low-pressure inlet of the steam ejector (17) through the fifth regulating valve (37). The steam generated by molten salt is used to eject the exhaust steam from the intermediate-pressure cylinder (6) of the steam turbine. The mixed steam at the outlet of the steam ejector (17) is sent to the industrial user (18) through the sixth regulating valve (38) to supply high-parameter industrial steam. After the industrial steam supplied to the industrial user (18) is used up, it is depressurized by the pressure reducing valve (39) and then sent to the condenser (10).

2. The steam supply system for a thermal power plant coupled with a steam ejector and multi-heat source molten salt thermal storage according to claim 1, characterized in that, The molten salt in the molten salt thermal storage system is a binary molten salt of 60% sodium nitrate and 40% potassium nitrate or a ternary mixed nitrate of 53% potassium nitrate, 40% sodium nitrite and 7% sodium nitrate. The temperature of the molten salt during the entire heat exchange process is controlled to not deviate from its operating temperature by setting the heat exchanger terminal differential.

3. The steam supply system for a thermal power plant coupled with a steam ejector and multi-heat source molten salt thermal storage according to claim 1, characterized in that, The flue gas / molten salt heat exchanger (4) is installed in the tail flue of the boiler; the superheater (2) and the reheater (3) are installed in the boiler.

4. A steam supply system for a thermal power plant coupled with a steam ejector and multi-heat source molten salt thermal storage according to claim 1, characterized in that, The steam ejector (17) is an adjustable ejector with an adjustable high-pressure nozzle and a mixing chamber throat area. The flow rate of the working steam at the high-pressure inlet and the flow rate of the ejector steam at the low-pressure inlet are adjusted by the fourth regulating valve (36) and the fifth regulating valve (37), respectively. According to the demand for industrial steam, the main structural parameters and working / ejector fluid flow rate of the steam ejector (17) are adjusted to maintain a high ejection ratio and meet the parameter requirements for industrial steam.

5. A steam supply system for a thermal power plant coupled with a steam ejector and multi-heat source molten salt thermal storage according to claim 4, characterized in that, The high-pressure inlet working steam of the steam ejector (17) is high-parameter superheated steam generated by the bypass feedwater of the outlet of the high-temperature molten salt heated deaerator (9), and the low-pressure inlet ejector steam is the exhaust steam of the intermediate-pressure cylinder (6) of the steam turbine.

6. A steam supply system for a thermal power plant coupled with a steam ejector and multi-heat source molten salt thermal storage according to claim 4, characterized in that, The steam ejector (17) needs to be designed and calculated based on the parameters of the high-pressure inlet working steam, the low-pressure inlet ejector steam and the actual industrial steam, and its key structural parameters need to be determined.

7. A steam supply system for a thermal power plant coupled with a steam ejector and multi-heat source molten salt thermal storage according to claim 4, characterized in that, The high-pressure inlet working steam parameters of the steam ejector (17) can be flexibly adjusted by changing the temperature, pressure, flow rate of the molten salt thermal storage system and the differential pressure at the heat exchanger terminals.

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