Industrial steam supply system based on fused salt energy storage and steam extraction heat regeneration

Abstract

The invention discloses an industrial steam supply system based on fused salt energy storage and steam extraction heat regeneration, which belongs to the technical field of heat energy engineering and energy storage and comprises a power plant thermodynamic system, a fused salt energy storage system, a salt / water heat exchanger and a mixed heat exchanger. The power plant thermodynamic system comprises a deaerator. The fused salt energy storage system comprises an electric heater, a high-temperature fused salt tank and a low-temperature fused salt tank. A steam water supply inlet of the salt / water heat exchanger is sequentially connected with the mixed heat exchanger and the deaerator, and deoxygenated water output by the deaerator enters the mixed heat exchanger through a steam water supply pipeline. A steam outlet of the salt / water heat exchanger is connected to industrial gas equipment through an industrial steam supply pipeline, and steam in the industrial steam supply pipeline partially flows back into the mixed heat exchanger through a first steam extraction pipeline, is mixed with deoxygenated water entering the mixed heat exchanger and exchanges heat with the deoxygenated water; the device safety problem caused by large temperature difference is solved, and improvement of the overall efficiency and safety of the system is facilitated.

Description

Technical Field

[0001] The present application relates to the technical fields of thermal energy engineering and energy storage technology. Specifically, it relates to an industrial steam supply system based on molten salt energy storage and extraction steam regeneration. Background Art

[0002] Currently, industrial steam supply systems generally have problems of low efficiency and unstable equipment operation. Especially in the case of large load fluctuations, traditional industrial steam heating systems often struggle to cope with the instability of energy supply. As a common thermal energy storage technology, the molten salt energy storage system can store heat for a long time and heat the incoming water to generate steam when needed. Since the water pressure of the main feed pump is too high, using the water from the deaerator for supply can avoid setting throttle devices and simplify the system. However, the temperature difference between the water from the deaerator and the molten salt at the inlet of the heat exchanger is large, which may cause problems such as solidification and caking of the molten salt. This will not only reduce the heat exchange efficiency of the system but also may cause pipeline blockage, affecting the long-term safe operation of the equipment. Summary of the Invention

[0003] The present application aims to provide an industrial steam supply system based on molten salt energy storage and extraction steam regeneration, aiming to solve the problems in the prior art that using the water from the deaerator as steam supply affects the heat exchange efficiency and equipment safety.

[0004] An industrial steam supply system based on molten salt energy storage and extraction steam regeneration includes a power plant thermal system, a molten salt energy storage system, a salt / water heat exchanger, and a mixing heat exchanger; the power plant thermal system includes a deaerator, and the molten salt energy storage system includes an electric heater, a high-temperature molten salt tank, and a low-temperature molten salt tank; the inlet end of the electric heater is connected to the low-temperature molten salt tank, and the outlet end of the electric heater is connected to the high-temperature molten salt tank; The first inlet end of the salt / water heat exchanger is connected to the high-temperature molten salt tank, and the first outlet end of the salt / water heat exchanger is connected to the low-temperature molten salt tank; The second inlet end of the salt / water heat exchanger is connected to the outlet end of the mixing heat exchanger, and the inlet end of the mixing heat exchanger is connected to the first outlet end of the deaerator through a steam supply pipeline; the deaerated water output by the deaerator enters the mixing heat exchanger through the steam supply pipeline; The second outlet end of the salt / water heat exchanger is connected to industrial gas-consuming equipment through an industrial steam supply pipeline; a first extraction steam pipeline is provided on the industrial steam supply pipeline, and the first extraction steam pipeline is connected to the inlet end of the mixing heat exchanger; the steam in the industrial gas supply pipeline partially returns to the mixing heat exchanger through the first extraction steam pipeline, mixes with the deaerated water entering the mixing heat exchanger, and exchanges heat.

[0005] Optionally, a booster pump is provided on the steam supply pipeline. The inlet end of the booster pump is connected to the first outlet end of the deaerator, and the outlet end of the booster pump is connected to the inlet end of the mixing heat exchanger. The booster pump is used to boost the pressure of the deaerated water output by the deaerator so that the pressure of the deaerated water reaches a preset range.

[0006] Optionally, a first flow regulating valve is provided on the steam supply pipeline. The first flow regulating valve is used to regulate the flow rate of the deaerated water entering the mixing heat exchanger. A second flow regulating valve is provided on the first extraction steam pipeline. The second flow regulating valve is used to regulate the flow rate of the steam flowing back to the mixing heat exchanger.

[0007] Optionally, the power plant thermal system further includes a boiler, a steam turbine, a main steam pipeline, a condensate pipeline, and a main feed water pipeline. The steam turbine has a high-pressure cylinder and a low-pressure cylinder. The outlet end of the boiler is connected to the inlet end of the high-pressure cylinder through the main steam pipeline. The outlet end of the low-pressure cylinder is connected to the inlet end of the deaerator through the condensate pipeline. The second outlet end of the deaerator is connected to the inlet end of the boiler through the main feed water pipeline. A reheater is provided on the boiler. The inlet end of the reheater is connected to the outlet end of the high-pressure cylinder, and the outlet end of the reheater is connected to the inlet end of the low-pressure cylinder. On the condensate pipeline, a condenser, a condensate pump, and a low-pressure feedwater heater are sequentially arranged along the outlet end of the low-pressure cylinder to the inlet end of the deaerator. On the main feed water pipeline, a main feed water pump and a high-pressure feedwater heater are sequentially arranged along the second outlet end of the deaerator to the inlet end of the boiler.

[0008] Optionally, the first inlet end of the low-pressure feedwater heater is connected to the outlet end of the condensate pump, and the first outlet end of the low-pressure feedwater heater is connected to the inlet end of the deaerator. The second inlet end of the low-pressure feedwater heater is connected to the low-pressure cylinder through a second extraction steam pipeline, and the second outlet end of the low-pressure feedwater heater is connected to the condenser. The first inlet end of the high-pressure feedwater heater is connected to the outlet end of the main feed water pump, the inlet end of the main feed water pump is connected to the second outlet end of the deaerator, and the first outlet end of the high-pressure feedwater heater is connected to the inlet end of the boiler. The second inlet end of the high-pressure feedwater heater is connected to the high-pressure cylinder through a third extraction steam pipeline, and the second outlet end of the high-pressure feedwater heater is connected to the inlet end of the deaerator.

[0009] Optionally, a heat insulation layer is provided outside the high-temperature molten salt tank.

[0010] Optionally, a first molten salt pump is provided between the electric heater and the low-temperature molten salt tank. The inlet end of the first molten salt pump is connected to the outlet end of the low-temperature molten salt tank, and the outlet end of the first molten salt pump is connected to the inlet end of the electric heater. A second molten salt pump is provided between the salt / water heat exchanger and the high-temperature molten salt tank. The inlet end of the second molten salt pump is connected to the outlet end of the high-temperature molten salt tank, and the outlet end of the second molten salt pump is connected to the first inlet end of the salt / water heat exchanger.

[0011] Optionally, a third flow regulating valve is provided at the inlet end of the electric heater. The third flow regulating valve is used to regulate the flow rate of the low-temperature molten salt entering the electric heater. A fourth flow regulating valve is provided at the first inlet end of the salt / water heat exchanger. The fourth flow regulating valve is used to regulate the flow rate of the high-temperature molten salt entering the salt / water heat exchanger.

[0012] Beneficial effects: The industrial steam supply system based on molten salt energy storage and extraction steam regeneration described in this application includes a power plant thermal system, a molten salt energy storage system, a salt / water heat exchanger, and a mixing heat exchanger. The power plant thermal system includes a deaerator. The molten salt energy storage system includes an electric heater, a high-temperature molten salt tank, and a low-temperature molten salt tank. The steam supply inlet of the salt / water heat exchanger is sequentially connected to the mixing heat exchanger and the deaerator. The deaerated water output by the deaerator enters the mixing heat exchanger through a steam supply pipeline. The steam outlet of the salt / water heat exchanger is connected to industrial gas-consuming equipment through an industrial steam supply pipeline. The steam in the industrial steam supply pipeline partially returns to the mixing heat exchanger through a first extraction steam pipeline and mixes and exchanges heat with the deaerated water entering the mixing heat exchanger. In this application, by providing a mixing heat exchanger and using the first extraction steam pipeline to lead the steam back to the mixing heat exchanger, the deaerated water from the deaerator is mixed and exchanged with the steam to increase the temperature. On the one hand, it can make the temperature of the deaerated water from the deaerator more uniform in the salt / water heat exchanger, which helps to reduce heat loss and local overheating problems caused by uneven heat distribution, thereby optimizing the heat exchange effect and improving the thermal efficiency of the overall system. On the other hand, it can effectively control the temperature difference at the inlet of the salt / water heat exchanger within a suitable range, thereby avoiding the problem of molten salt caking caused by too large a temperature difference and ensuring the stability of the system during long-term operation and the safety and reliability of equipment operation. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1This is a schematic diagram of an industrial steam supply system based on molten salt energy storage and extraction steam regeneration proposed in an embodiment of the present application.

[0015] Explanation of reference numerals: 1. Electric heater; 2. High-temperature molten salt tank; 3. Low-temperature molten salt tank; 4. Salt / water heat exchanger; 5. Mixing heat exchanger; 6. Booster water pump; 7. Industrial steam supply pipeline; 8. First extraction steam pipeline; 9. First flow regulating valve; 10. Second flow regulating valve; 11. First molten salt pump; 12. Second molten salt pump; 13. Third flow regulating valve; 14. Fourth flow regulating valve; 15. Steam supply pipeline; 16. Boiler; 17. Reheater; 18. High-pressure cylinder; 19. Low-pressure cylinder; 20. Condenser; 21. Condensate water pump; 22. Deaerator; 23. Main feed water pump; 24. Low-pressure regenerative heater; 25. High-pressure regenerative heater; 26. Generator. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0017] In the related art, the water from the deaerator is used as the steam supply water. The water pressure is relatively low compared with the water from the main feed water pump, which can avoid setting a throttling device, thereby simplifying the system. However, this also causes some problems.

[0018] First, the temperature of the water from the deaerator is relatively low, and the temperature difference between the water and the molten salt at the heat exchanger inlet is large, which may cause problems such as solidification and caking of the molten salt. This will not only reduce the heat exchange efficiency of the system, but also may cause pipeline blockage, affecting the long-term safe operation of the equipment. Second, the water from the deaerator is saturated water. The saturated water is easy to reach the boiling point and boil during the heating process. After boiling, it will cause a huge heat exchange volume, and in severe cases, it will cause pipeline blockage. Moreover, the direct boiling of the deaerated water will cause a two-phase flow of steam and liquid. This unstable flow state will not only reduce the heat exchange efficiency, but also cause serious safety problems, such as pressure fluctuations, pipeline vibrations, and even equipment damage.

[0019] Therefore, using the water from the deaerator as the steam supply in the current industrial steam supply system has problems affecting the heat exchange efficiency and equipment safety.

[0020] In view of this, an embodiment of the present application proposes an industrial steam supply system based on molten salt energy storage and extraction steam regeneration.

[0021] See Figure 1, an industrial steam supply system based on molten salt energy storage and extraction steam regeneration, comprising a power plant thermal system, a molten salt energy storage system, a salt / water heat exchanger 4 and a mixing heat exchanger 5; the power plant thermal system includes a deaerator 22, and the molten salt energy storage system includes an electric heater 1, a high-temperature molten salt tank 2 and a low-temperature molten salt tank 3; the inlet end of the electric heater 1 is connected to the low-temperature molten salt tank 3, and the outlet end of the electric heater 1 is connected to the high-temperature molten salt tank 2; The first inlet end of the salt / water heat exchanger 4 is connected to the high-temperature molten salt tank 2, and the first outlet end of the salt / water heat exchanger 4 is connected to the low-temperature molten salt tank 3; The second inlet end of the salt / water heat exchanger 4 is connected to the outlet end of the mixing heat exchanger 5, and the inlet end of the mixing heat exchanger 5 is connected to the first outlet end of the deaerator 22 through a steam supply pipeline 15; the deaerated water output by the deaerator 22 enters the mixing heat exchanger 5 through the steam supply pipeline 15; The second outlet end of the salt / water heat exchanger 4 is connected to industrial gas-using equipment through an industrial steam supply pipeline 7; a first extraction steam pipeline 8 is provided on the industrial steam supply pipeline 7, and the first extraction steam pipeline 8 is connected to the inlet end of the mixing heat exchanger 5; part of the steam in the industrial gas supply pipeline is refluxed to the mixing heat exchanger 5 through the first extraction steam pipeline 8 and mixed and heat-exchanged with the deaerated water entering the mixing heat exchanger 5.

[0022] Specifically, refer to Figure 1 , the molten salt energy storage system includes an electric heater 1, a high-temperature molten salt tank 2 and a low-temperature molten salt tank 3. Among them, low-temperature molten salt is stored in the low-temperature molten salt tank 3. The inlet end of the electric heater 1 is connected to the low-temperature molten salt tank 3, and the outlet port of the electric heater 1 is connected to the high-temperature molten salt tank 2. The electric heater 1 can heat the molten salt from the low-temperature molten salt tank 3. Through the power control of the electric heater 1, the temperature of the molten salt gradually rises until it reaches the set temperature. The heated high-temperature molten salt enters the high-temperature molten salt tank 2 to complete heat storage.

[0023] The salt / water heat exchanger 4 is a device for heat exchange between molten salt and steam supply water. It uses the heat of high-temperature molten salt to heat the steam supply water, thereby generating steam. Specifically, the first inlet end of the salt / water heat exchanger 4, i.e., the molten salt inlet end, is connected to the high-temperature molten salt tank 2, and the first outlet end of the salt / water heat exchanger 4, i.e., the molten salt outlet end, is connected to the low-temperature molten salt tank 3. After the high-temperature molten salt enters the salt / water heat exchanger 4, it exchanges heat with the low-temperature steam supply water. The temperature of the molten salt after heat exchange decreases and returns to the low-temperature molten salt tank 3. The second inlet end of the salt / water heat exchanger 4, i.e., the steam supply water inlet end, is sequentially connected to the mixing heat exchanger 5 and the deaerator 22. The deaerated water output by the deaerator 22 enters the salt / water heat exchanger 4 as steam supply water, is heated by the molten salt and then rises in temperature to generate steam. The second outlet end of the salt / water heat exchanger 4, i.e., the steam outlet end, is connected to the industrial steam-consuming equipment through the industrial steam supply pipeline 7, so that the generated steam can be used for heating, power generation or other needs.

[0024] Since the temperature of the deaerated water output by the deaerator 22 is relatively low, there is a large temperature difference between the deaerated water and the molten salt at the inlet of the salt / water heat exchanger 4, which may cause problems such as solidification and caking of the molten salt, affecting the heat exchange efficiency and the safe operation of the equipment. In this embodiment, a mixing heat exchanger 5 is provided between the salt / water heat exchanger 4 and the deaerator 22. The inlet end of the mixing heat exchanger 5 is connected to the first outlet end of the deaerator 22 through the steam supply pipeline 15, and the outlet end of the mixing heat exchanger 5 is connected to the second inlet end of the salt / water heat exchanger 4. Thus, the deaerated water output from the deaerator 22 will first enter the mixing heat exchanger 5 before entering the salt / water heat exchanger 4. Moreover, a branch pipeline, i.e., the first extraction steam pipeline 8, is provided on the industrial steam supply pipeline 7, and the first extraction steam pipeline 8 is connected to the inlet end of the mixing heat exchanger 5. Therefore, part of the generated steam can flow back to the mixing heat exchanger 5 through the first extraction steam pipeline 8. In this way, the deaerated water and the returned steam are mixed and heat-exchanged in the mixing heat exchanger 5, so that the temperature of the deaerated water rises, and the heated deaerated water then enters the salt / water heat exchanger 4 to exchange heat with the molten salt.

[0025] By the method of steam return, the steam is mixed with the deaerated water to raise the temperature of the deaerated water. On the one hand, it can make the temperature of the deaerated water in the salt / water heat exchanger 4 more uniform, which helps to reduce the heat loss and local overheating problems caused by uneven heat distribution, optimize the heat exchange effect, and improve the thermal efficiency of the overall system. On the other hand, it can reduce the temperature difference between the water and the molten salt at the inlet of the salt / water heat exchanger 4, avoid the solidification and caking of the molten salt, help to improve the heat exchange exergy efficiency, and ensure the long-term safe and stable operation of the equipment.

[0026] Optionally, a booster pump 6 is provided on the steam supply pipe 15. The inlet end of the booster pump 6 is connected to the first outlet end of the deaerator 22, and the outlet end of the booster pump 6 is connected to the inlet end of the mixing heat exchanger 5. The booster pump 6 is used to boost the pressure of the deaerated water output by the deaerator 22 so that the pressure of the deaerated water reaches a preset range.

[0027] Specifically, the water coming from the deaerator 22 is saturated water, and saturated water is likely to reach the boiling point and boil during the heating process. If the water coming from the deaerator 22 directly enters the salt / water heat exchanger 4 and is heated by the molten salt, two-phase flow is likely to occur, which will affect the safe operation of the equipment. To further ensure the safety of the system, in this embodiment, a booster pump 6 is provided on the steam supply pipe 15. The inlet end of the booster pump 6 is connected to the first outlet end of the deaerator 22, and the outlet end of the booster pump 6 is connected to the inlet end of the mixing heat exchanger 5. The booster pump 6 can boost the pressure of the deaerated water output by the deaerator 22 so that the deaerated water is boosted to a safe pressure range before entering the salt / water heat exchanger 4. The deaerated water changes from saturated water to subcooled water, avoiding boiling when it is mixed and heated with the reflux steam in the mixing heat exchanger 5, thus avoiding the equipment safety operation problem caused by the phase change of the working medium water.

[0028] Optionally, a first flow regulating valve 9 is provided on the steam supply pipe 15. The first flow regulating valve 9 is used to regulate the flow rate of the deaerated water entering the mixing heat exchanger 5. A second flow regulating valve 10 is provided on the first extraction steam pipe 8. The second flow regulating valve 10 is used to regulate the flow rate of the steam flowing back to the mixing heat exchanger 5.

[0029] Specifically, by providing the first flow regulating valve 9 on the steam supply pipe 15, the flow rate of the deaerated water entering the mixing heat exchanger 5 can be regulated. By providing the second flow regulating valve 10 on the first extraction steam pipe 8, the flow rate of the steam flowing back to the mixing heat exchanger 5 can be regulated. Therefore, the mixing ratio of water and steam can be precisely regulated through the first flow regulating valve 9 and the second flow regulating valve 10, so that the water flow temperature reaches a predetermined target. When the system fluctuates in heat load, the fluid temperature can be flexibly regulated through the first flow regulating valve 9 and the second flow regulating valve 10, which not only optimizes the heat supply performance of industrial steam supply, but also enhances the adaptability of the system under different working conditions, enabling it to operate efficiently and cope with different load demands and external environment changes.

[0030] Optionally, the power plant thermal system further includes a boiler 16, a steam turbine, a main steam pipeline, a condensate pipeline, and a main feedwater pipeline. The steam turbine has a high-pressure cylinder 18 and a low-pressure cylinder 19. The outlet end of the boiler 16 is connected to the inlet end of the high-pressure cylinder 18 through the main steam pipeline. The outlet end of the low-pressure cylinder 19 is connected to the inlet end of the deaerator 22 through the condensate pipeline. The second outlet end of the deaerator 22 is connected to the inlet end of the boiler 16 through the main feedwater pipeline. A reheater 17 is provided on the boiler 16. The inlet end of the reheater 17 is connected to the outlet end of the high-pressure cylinder 18, and the outlet end of the reheater 17 is connected to the inlet end of the low-pressure cylinder 19. On the condensate pipeline, a condenser 20, a condensate pump 21, and a low-pressure feedwater heater 24 are sequentially arranged along the outlet end of the low-pressure cylinder 19 towards the inlet end of the deaerator 22. On the main feedwater pipeline, a main feedwater pump 23 and a high-pressure feedwater heater 25 are sequentially arranged along the second outlet end of the deaerator 22 towards the inlet end of the boiler 16.

[0031] The first inlet end of the low-pressure feedwater heater 24 is connected to the outlet end of the condensate pump 21, and the first outlet end of the low-pressure feedwater heater 24 is connected to the inlet end of the deaerator 22. The second inlet end of the low-pressure feedwater heater 24 is connected to the low-pressure cylinder 19 through a second extraction steam pipeline, and the second outlet end of the low-pressure feedwater heater 24 is connected to the condenser 20. The first inlet end of the high-pressure feedwater heater 25 is connected to the outlet end of the main feedwater pump 23. The inlet end of the main feedwater pump 23 is connected to the second outlet end of the deaerator 22. The first outlet end of the high-pressure feedwater heater 25 is connected to the inlet end of the boiler 16. The second inlet end of the high-pressure feedwater heater 25 is connected to the high-pressure cylinder 18 through a third extraction steam pipeline, and the second outlet end of the high-pressure feedwater heater 25 is connected to the inlet end of the deaerator 22.

[0032] Specifically, referring to Figure 1 , the power plant thermal system further includes a boiler 16, a steam turbine, a main steam pipeline, a condensate pipeline, and a main feedwater pipeline. The steam turbine has a high-pressure cylinder 18 and a low-pressure cylinder 19, which jointly provide power for the generator 26. The boiler 16 uses the main steam pipeline to supply high-temperature and high-pressure main steam to the high-pressure cylinder 18. The condensate pipeline is used to send the condensed water in the low-pressure cylinder 19 into the deaerator 22. The main feedwater pipeline is used to transport the water deaerated by the deaerator 22 back to the boiler 16. On the condensate pipeline, a condenser 20, a condensate pump 21, and a low-pressure feedwater heater 24 are sequentially arranged along the outlet end of the low-pressure cylinder 19 towards the inlet end of the deaerator 22. On the main feedwater pipeline, a main feedwater pump 23 and a high-pressure feedwater heater 25 are sequentially arranged along the second outlet end of the deaerator 22 towards the inlet end of the boiler 16.

[0033] Specifically, the low-temperature and low-pressure exhausted steam in the low-pressure cylinder 19 is cooled into liquid water by the condenser 20, and is sent into the low-pressure regenerative heater 24 by the condensate pump 21. Part of the steam in the low-pressure cylinder 19 is extracted through the second extraction steam pipeline for preheating. After preheating, it enters the deaerator 22. After removing oxygen through thermal deaeration, it is pressurized to a high-pressure state by the main feed pump 23, and then enters the high-pressure regenerative heater 25. Part of the steam in the high-pressure cylinder 18 is extracted through the third extraction steam pipeline for further heating until it reaches a temperature close to that required by the boiler 16.

[0034] The high-pressure water enters the boiler 16 and is heated into high-temperature and high-pressure superheated steam. The superheated steam drives the high-pressure cylinder 18 of the steam turbine to do work. After the pressure and temperature drop, it returns to the reheater 17 of the boiler 16 for secondary heating. After the temperature is increased, it enters the low-pressure cylinder 19 to continue expanding and doing work, driving the generator 26 to generate electricity. The exhausted steam after doing work returns to the condenser 20 to condense into liquid water, and the cycle restarts.

[0035] In practical applications, the numbers of the high-pressure regenerative heater 25 and the low-pressure regenerative heater 24 can be flexibly adjusted according to the needs of specific applications.

[0036] In the industrial steam supply system provided in this embodiment, the molten salt energy storage system is combined with the power plant thermal system to achieve efficient energy storage and transmission. The water from the deaerator 22 instead of the water from the main feed pump 23 is used as the water supply source for industrial steam. Since it has not passed through the main feed pump 23 for pressurization, the incoming water pressure will not be too high, avoiding the complex steps of using a throttling device to reduce the pressure in the traditional system, simplifying the system, reducing energy loss, lowering the risk of equipment failure and maintenance cost, and further improving the economy and stability of the system.

[0037] Optionally, an insulating layer is provided outside the high-temperature molten salt tank 2.

[0038] Specifically, after the molten salt is heated by the electric heater 1, its temperature rises, and then it is sent into the high-temperature molten salt tank 2 to achieve long-term storage of thermal energy. In order to prevent heat loss, an insulating layer is provided outside the high-temperature molten salt tank 2, which has good heat insulation performance to ensure that heat is not easily dissipated.

[0039] Optionally, a first molten salt pump 11 is provided between the electric heater 1 and the low-temperature molten salt tank 3. The inlet end of the first molten salt pump 11 is connected to the outlet end of the low-temperature molten salt tank 3, and the outlet end of the first molten salt pump 11 is connected to the inlet end of the electric heater 1; a second molten salt pump 12 is provided between the salt / water heat exchanger 4 and the high-temperature molten salt tank 2. The inlet end of the second molten salt pump 12 is connected to the outlet end of the high-temperature molten salt tank 2, and the outlet end of the second molten salt pump 12 is connected to the first inlet end of the salt / water heat exchanger 4.

[0040] Specifically, a first molten salt pump 11 is provided between the electric heater 1 and the low-temperature molten salt tank 3. The inlet end of the first molten salt pump 11 is connected to the outlet end of the low-temperature molten salt tank 3, and the outlet end of the first molten salt pump 11 is connected to the inlet end of the electric heater 1. By providing the first molten salt pump 11, it is convenient to transport the low-temperature molten salt stored in the low-temperature molten salt tank 3 into the electric heater 1, and after heating and temperature rise in the electric heater 1, it is sent into the high-temperature molten salt tank 2 to complete heat energy storage.

[0041] A second molten salt pump 12 is provided between the salt / water heat exchanger 4 and the high-temperature molten salt tank 2. The inlet end of the second molten salt pump 12 is connected to the outlet end of the high-temperature molten salt tank 2, and the outlet end of the second molten salt pump 12 is connected to the first inlet end of the salt / water heat exchanger 4. By providing the second molten salt pump 12, it is convenient to transport the high-temperature molten salt in the high-temperature molten salt tank 2 into the salt / water heat exchanger 4, and after heat exchange and temperature reduction with deaerated water in the salt / water heat exchanger 4, it is sent back to the low-temperature molten salt tank 3 to complete heat energy release.

[0042] Optionally, a third flow regulating valve 13 is provided at the inlet end of the electric heater 1, and the third flow regulating valve 13 is used to regulate the flow rate of the low-temperature molten salt entering the electric heater 1; a fourth flow regulating valve 14 is provided at the first inlet end of the salt / water heat exchanger 4, and the fourth flow regulating valve 14 is used to regulate the flow rate of the high-temperature molten salt entering the salt / water heat exchanger 4.

[0043] Specifically, a third flow regulating valve 13 is provided at the inlet end of the electric heater 1. Through the third flow regulating valve 13, it is convenient to regulate the flow rate of the low-temperature molten salt entering the electric heater 1; a fourth flow regulating valve 14 is provided at the first inlet end of the salt / water heat exchanger 4. Through the fourth flow regulating valve 14, it is convenient to regulate the flow rate of the high-temperature molten salt used to heat deaerated water entering the salt / water heat exchanger 4. In this embodiment, by providing the third flow regulating valve 13 and the fourth flow regulating valve 14, the flow rate of the molten salt can be reasonably regulated, the performance of the molten salt heat storage system can be optimized, the storage or release rate and efficiency of heat energy can be improved, and the stable operation of the system can be ensured.

[0044] The industrial steam supply system based on molten salt energy storage and extraction steam regeneration provided by the embodiments of the present application solves the equipment safety problems caused by excessive temperature difference and gas-liquid phase change, improves the thermal efficiency of the overall system, ensures the long-term safe and stable operation of the equipment, and can flexibly respond to heat load fluctuations and external environment changes, improving the adaptability of the system under different working conditions.

[0045] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other for reference.

[0046] It should also be noted that in this text, the orientation or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. In addition, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor can they be construed as indicating or implying relative importance. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the element.

[0047] The technical solutions provided in this application have been introduced in detail above. Specific examples are used in this text to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand this application, and the content of this specification should not be construed as a limitation to this application. At the same time, for those of ordinary skill in the art, based on this application, there will be various forms of changes in the specific implementation manners and application scopes. It is not necessary and impossible to list all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of this application.

Claims

1. An industrial steam supply system based on molten salt energy storage and steam extraction and regeneration, characterized in that, Comprising: A thermal power system of a power plant, a molten salt energy storage system, a salt / water heat exchanger, and a hybrid heat exchanger; The thermal power system of the power plant includes a deaerator, and the molten salt energy storage system includes an electric heater, a high-temperature molten salt tank, and a low-temperature molten salt tank; The inlet end of the electric heater is connected to the low-temperature molten salt tank, and the outlet end of the electric heater is connected to the high-temperature molten salt tank; The first inlet end of the salt / water heat exchanger is connected to the high-temperature molten salt tank, and the first outlet end of the salt / water heat exchanger is connected to the low-temperature molten salt tank; The second inlet end of the salt / water heat exchanger is connected to the outlet end of the hybrid heat exchanger, and the inlet end of the hybrid heat exchanger is connected to the first outlet end of the deaerator through a steam supply pipeline; The deaerated water output by the deaerator enters the hybrid heat exchanger through the steam supply pipeline; The second outlet end of the salt / water heat exchanger is connected to industrial steam-consuming equipment through an industrial steam supply pipeline; A first extraction steam pipeline is provided on the industrial steam supply pipeline, and the first extraction steam pipeline is connected to the inlet end of the hybrid heat exchanger; Part of the steam in the industrial steam supply pipeline flows back to the hybrid heat exchanger through the first extraction steam pipeline, mixes with the deaerated water entering the hybrid heat exchanger, and exchanges heat.

2. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 1, wherein: A booster pump is provided on the steam supply pipeline, the inlet end of the booster pump is connected to the first outlet end of the deaerator, and the outlet end of the booster pump is connected to the inlet end of the hybrid heat exchanger; The booster pump is used to boost the pressure of the deaerated water output by the deaerator so that the pressure of the deaerated water reaches a preset range.

3. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 1, wherein: A first flow regulating valve is provided on the steam supply pipeline, and the first flow regulating valve is used to regulate the flow rate of the deaerated water entering the hybrid heat exchanger; A second flow regulating valve is provided on the first extraction steam pipeline, and the second flow regulating valve is used to regulate the flow rate of the steam flowing back to the hybrid heat exchanger.

4. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 1, wherein: The thermal power system of the power plant further includes a boiler, a steam turbine, a main steam pipeline, a condensate pipeline, and a main feed water pipeline, and the steam turbine has a high-pressure cylinder and a low-pressure cylinder; The outlet end of the boiler is connected to the inlet end of the high-pressure cylinder through the main steam pipeline. The outlet end of the low-pressure cylinder is connected to the inlet end of the deaerator through the condensate pipeline. The second outlet end of the deaerator is connected to the inlet end of the boiler through the main feed water pipeline. A reheater is provided on the boiler. The inlet end of the reheater is connected to the outlet end of the high-pressure cylinder, and the outlet end of the reheater is connected to the inlet end of the low-pressure cylinder. On the condensate pipeline, a condenser, a condensate pump, and a low-pressure feedwater heater are sequentially arranged along the outlet end of the low-pressure cylinder towards the inlet end of the deaerator. On the main feed water pipeline, a main feed water pump and a high-pressure feedwater heater are sequentially arranged along the second outlet end of the deaerator towards the inlet end of the boiler.

5. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 4, wherein: The first inlet end of the low-pressure feedwater heater is connected to the outlet end of the condensate pump, and the first outlet end of the low-pressure feedwater heater is connected to the inlet end of the deaerator. The second inlet end of the low-pressure feedwater heater is connected to the low-pressure cylinder through a second extraction steam pipeline, and the second outlet end of the low-pressure feedwater heater is connected to the condenser. The first inlet end of the high-pressure feedwater heater is connected to the outlet end of the main feed water pump. The inlet end of the main feed water pump is connected to the second outlet end of the deaerator. The first outlet end of the high-pressure feedwater heater is connected to the inlet end of the boiler. The second inlet end of the high-pressure feedwater heater is connected to the high-pressure cylinder through a third extraction steam pipeline, and the second outlet end of the high-pressure feedwater heater is connected to the inlet end of the deaerator.

6. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 1, wherein: An adiabatic layer is provided outside the high-temperature molten salt tank.

7. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 1, wherein: A first molten salt pump is provided between the electric heater and the low-temperature molten salt tank. The inlet end of the first molten salt pump is connected to the outlet end of the low-temperature molten salt tank, and the outlet end of the first molten salt pump is connected to the inlet end of the electric heater. A second molten salt pump is provided between the salt / water heat exchanger and the high-temperature molten salt tank. The inlet end of the second molten salt pump is connected to the outlet end of the high-temperature molten salt tank, and the outlet end of the second molten salt pump is connected to the first inlet end of the salt / water heat exchanger.

8. The industrial steam supply system based on molten salt energy storage and extraction steam regeneration according to claim 1, wherein: A third flow regulating valve is provided at the inlet end of the electric heater, and the third flow regulating valve is used to regulate the flow rate of the low-temperature molten salt entering the electric heater. A fourth flow regulating valve is provided at the first inlet end of the salt / water heat exchanger, and the fourth flow regulating valve is used to regulate the flow rate of the high-temperature molten salt entering the salt / water heat exchanger.

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