A molten salt heat storage heat exchange system for outputting heat through medium circulation

Abstract

The utility model relates to molten salt energy storage heating technology field especially through medium circulation output heating's molten salt heat storage heat exchange system. Through medium circulation output heating's molten salt heat storage heat exchange system includes electric heating molten salt energy storage device, and electric heating molten salt energy storage device includes molten salt heat storage jar, molten salt, electric heating device, power supply, and the molten salt is stored in molten salt heat storage jar, and molten salt heat storage jar is configured electric heating device, and is immersed in the molten salt in molten salt heat storage jar. The heat exchange device of large -scale innovative structure is directly configured in molten salt heat storage jar, and constitutes energy storage heat exchange integrated energy storage, heat exchange, no molten salt pump circulation output heating system, realizes the simple energy storage heating output independent unit system of no molten salt circulating pump and high temperature molten salt heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of molten salt energy storage and heating technology, and in particular to a molten salt thermal storage and heat exchange system that supplies heat through medium circulation. Background Technology

[0002] The applicant filed an application with the State Intellectual Property Office in 2021 for "A Photovoltaic Energy Storage Power Station," application number 202110517433.4. The proposed molten salt energy storage and heat exchange energy output are both achieved through molten salt pump circulation heat exchange, and the molten salt output heat exchange is entirely composed of heat exchange coil type heat exchangers. These heat exchange coil type heat exchangers, besides having low heat exchange capacity, cannot be disassembled, repaired, or replaced. In particular, the heat exchange coil type heat exchanger is difficult to apply in large-scale molten salt energy storage applications, especially in the conversion of molten salt energy storage for steam utilization. This presents a significant bottleneck for large-scale energy storage heating applications, such as energy storage for peak shaving and valley filling in thermal power plants, surplus electricity storage for wind and solar power plants, and energy storage for balancing power generation and supply on the user side of the power grid. Currently, molten salt energy storage has developed rapidly. Existing technologies in large-scale molten salt energy storage heating applications mostly utilize electricity, steam, natural gas, fuel oil, and high-temperature waste heat to heat solid molten salt into a liquid state. Because the molten salt phase-change process stores a large amount of heat, this thermal energy is stored in an insulated tank or bath. A molten salt pump then circulates the high-temperature liquid molten salt to the primary side of a high-temperature molten salt heat exchanger, where it exchanges heat with the secondary side heat transfer oil to output high-temperature heat, or with the secondary side water to output steam or hot water for heating. Both the molten salt circulation and heat exchange output rely heavily on the high-temperature circulation of the molten salt pump. However, high-temperature molten salt pumps are expensive, energy-intensive, and prone to damage. Especially when molten salt energy storage is used as user-side energy storage in power systems, configuring high-temperature molten salt pumps not only brings inconvenience to users and increases system investment, but also increases system complexity and maintenance, as well as heat loss during the molten salt circulation process. The existing serpentine heat exchange coils installed in molten salt storage tanks can only be used in small molten salt energy storage heat exchange devices, and cannot be used in large energy storage systems. This seriously affects the innovative application of these systems in thermal power plants and large industrial energy storage heat exchange output heating systems. Utility Model Content

[0003] The purpose of this invention is to provide a molten salt thermal storage and heat exchange system that supplies heat through medium circulation, which can solve the problems existing in the prior art;

[0004] This utility model provides a molten salt thermal storage and heat exchange system that supplies heat through medium circulation, which includes an electrothermal molten salt energy storage device.

[0005] The electrothermal molten salt energy storage device includes a molten salt storage tank 1, molten salt 2, an electrothermal device 3, and a power supply 4;

[0006] The molten salt 2 is stored in the molten salt storage tank 1, and the molten salt storage tank 1 is equipped with the electric heating device 3, which is immersed in the molten salt 2 inside the molten salt storage tank 1.

[0007] Preferably, it also includes a molten salt heat exchange output device;

[0008] The molten salt heat exchange output device 5 includes: a heat exchange tube fixing plate 59, a heat exchange tube expansion and / or welding joint 60, a heat exchange tube inlet and outlet medium separation plate 61, a heat exchange tube inlet and outlet medium sealing cap 62, a heat exchange tube fixing plate flange 63, a heat exchange U-shaped tube 65, a medium inlet 66, and a medium outlet 67.

[0009] The heat exchange U-tube 65 is composed of at least one or more U-tube bundles;

[0010] The heat exchange U-shaped tube 65 is connected to the heat exchange tube fixing plate 59 through the heat exchange tube expansion and / or welding joint 60.

[0011] The medium inlet 66 of the heat exchange U-shaped tube 65 is separated and isolated from the medium outlet 67 by the medium inlet / outlet partition plate 61.

[0012] Preferably, it includes: a molten salt heat storage tank 1, molten salt 2, an electric heating device 3, a power supply 4, and a molten salt heat exchange output device 5;

[0013] The molten salt 2 is stored in the molten salt heat storage tank 1, the electric heating device 3 is disposed in the molten salt heat storage tank 1 and immersed in the molten salt 2, and the molten salt heat exchange output device 5 is disposed in the molten salt heat storage tank 1 and immersed in the molten salt 2;

[0014] The power source 4 is a three-phase power source or a single-phase power source.

[0015] Preferably, it includes: a molten salt heat storage tank 1, molten salt 2, a molten salt heat exchange output device 5, and a steam heat exchanger 8;

[0016] The steam heat exchanger 8 is disposed inside the molten salt storage tank 1 and immersed in the molten salt 2.

[0017] Preferably, it includes: molten salt heat storage tank 1, molten salt 2, flue gas or flame heat exchange tube 11, flue gas or flame 14;

[0018] The flue gas or flame heat exchange tube 11 is disposed in the molten salt heat storage tank 1 and immersed in the molten salt 2.

[0019] Preferably, it includes: a molten salt heat storage tank 1, molten salt 2, an electric heating device 3, a power supply 4, and an external heat exchanger 45 for the molten salt heat storage tank;

[0020] The external heat exchanger 45 of the molten salt storage tank is disposed outside the molten salt storage tank 1 and is in close contact or welded to the outer surface of the molten salt heat storage tank 1 with zero thermal resistance.

[0021] Preferably, it includes: molten salt heat storage tank 1, molten salt 2, molten salt heat exchange output device 5, high temperature resistant heat insulation material 47, electromagnetic induction coil 48, first electromagnetic induction coil terminal 40, second electromagnetic induction coil terminal 50, first electromagnetic induction generator terminal 51, second electromagnetic induction generator terminal 52, electromagnetic induction generator 53, and electromagnetic induction generator power supply 54.

[0022] The high-temperature resistant heat insulation material 47 is tightly wrapped around the outside of the molten salt heat storage tank 1, and the electromagnetic induction coil 48 is wrapped around the outside of the high-temperature resistant heat insulation material 47. The first electromagnetic induction coil terminal 40 and the second electromagnetic induction coil terminal 50 are connected to the first electromagnetic induction generator terminal 51 and the second electromagnetic induction generator terminal 52.

[0023] The electromagnetic induction generator 53 generates a high-frequency current that is supplied to the electromagnetic induction coil 48 via the first electromagnetic induction generator terminal 51 and the second electromagnetic induction generator terminal 52, and the first electromagnetic induction coil terminal 40 and the second electromagnetic induction coil terminal 50.

[0024] Preferably, it includes: an external water jacket heat exchanger 55, a first external water jacket heat exchanger interface 56, a second external water jacket heat exchanger interface 57, and an external water jacket heat exchanger water channel 58.

[0025] The external water jacket heat exchanger 55 is disposed outside the molten salt heat storage tank 1. The upper and lower ends of the external water jacket heat exchanger channel 58 are welded and sealed to the outside of the molten salt heat storage tank 1. The medium flowing in the external water jacket heat exchanger channel 58 is connected to the outer surface of the molten salt heat storage tank 1 for heat exchange. The first external water jacket heat exchanger interface 56 and the second external water jacket heat exchanger interface 57 are connected to the medium in the external water jacket heat exchanger channel 58.

[0026] Preferably, it includes: a molten salt heat storage tank 1, molten salt 2, an electric heating device 3, a power supply 4, a molten salt heat exchange output device 5, a water pump 15, a water interface 16, and a steam outlet 18;

[0027] One end of the water pump 15 is connected to one end of the molten salt heat exchange output device 5, the other end of the water pump 15 is connected to the water interface 16, and the other end of the molten salt heat exchange output device 5 is connected to the steam outlet 18.

[0028] Preferably, it includes: a water tank 24, water 25, a gas-water mixer 26, and an electromagnetic or electric valve 22;

[0029] One end of the electromagnetic or electric valve 22 is connected to one end of the molten salt heat exchange output device 5 and the steam outlet 18, and the other end of the electromagnetic or electric valve 22 is connected to the gas-water mixer 26.

[0030] The water tank 24 contains the water 25, and the gas-water mixer 26 is disposed within the water 25.

[0031] Preferably, it includes: molten salt heat storage tank 1, molten salt 2, electric heating device 3, power supply 4, molten salt heat exchange output device 5, heating circulation pump 30, radiator and / or floor heating pipe 31 and / or fan coil unit 32 and / or hot water outlet 33, expansion tank 35, water 36, float valve 37 and gas-water mixer 38.

[0032] One end of the heating circulation pump 30 is connected to one end of the radiator and / or the floor heating pipe 31 and / or the fan coil unit 32 and / or the hot water outlet 33. The other end of the heating circulation pump 30 is connected to one end of the molten salt heat exchange output device 5. The other end of the molten salt heat exchange output device 5 is connected to the other end of the radiator and / or the floor heating pipe 31 and / or the fan coil unit 32 and / or the hot water outlet 33 and the air-water mixer 38.

[0033] The expansion tank 35 contains water 36, and the gas-water mixer 38 is disposed in the water 36 within the expansion tank 35.

[0034] Preferably, it includes: a heating circulation pump 30, radiators and / or floor coils 31 and / or fan coil units 32 and / or hot water outlets 33, a gas-water mixer 38 and an external heat exchanger for the molten salt storage tank 45;

[0035] One end of the heating circulation pump 30 is connected to one end of the external heat exchanger 45 of the molten salt storage tank, and one end of the radiator and / or the floor heating pipe 31 and / or the fan coil unit 32 and / or the hot water outlet 33 and the gas-water mixer 38 are connected to the other end of the external heat exchanger 45 of the molten salt storage tank.

[0036] Preferably, it includes: molten salt heat exchange output device 5, water pump 15, water interface 16 and steam outlet 18;

[0037] One end of the water pump 15 is connected to one end of the molten salt heat exchange output device 5, the other end of the water pump 15 is connected to the water interface 16, and the other end of the molten salt heat exchange output device 5 is connected to the steam outlet 18.

[0038] Preferably, it includes: molten salt heat exchange output device 5, water pump 15, water interface 16 and steam outlet 18;

[0039] One end of the water pump 15 is connected to one end of the molten salt heat exchange output device 5, the other end of the water pump 15 is connected to the water interface 16, and the other end of the molten salt heat exchange output device 5 is connected to the steam outlet 18.

[0040] Preferably, it includes: molten salt heat exchange output device 5, steam outlet 18, molten salt storage tank external heat exchanger 45, water pump 71 and pure water or softened water interface 70;

[0041] The water pump 71 is connected to one end of the external heat exchanger 45 of the molten salt storage tank, and the other end of the water pump 71 is connected to the pure water or softened water interface 70. The other end of the external heat exchanger 45 of the molten salt storage tank is connected to one end of the molten salt heat exchange output device 5, and the other end of the molten salt heat exchange output device 5 is connected to the steam outlet 18.

[0042] Preferably, it includes: a second-stage molten salt heat storage tank 1, a second-stage molten salt 2, a second-stage electric heating device 3, a second-stage power supply 4, a second-stage molten salt heat exchange output device 5, a first-stage molten salt heat storage tank 1, a first-stage molten salt heat exchange output device 5, a steam outlet 18, an external heat exchanger for the molten salt storage tank 45, a pure water or softened water interface 70, and a water pump 71.

[0043] The water pump 71 is connected to one end of the external heat exchanger 45 of the molten salt storage tank, and the other end of the water pump 71 is connected to the pure water or softened water interface 70. The other end of the external heat exchanger 45 of the molten salt storage tank is connected to one end of the first-stage molten salt heat exchange output device 5, and the other end of the first-stage molten salt heat exchange output device 5 is connected to one end of the second-stage molten salt heat exchange output device 5. The other end of the second-stage molten salt heat exchange output device 5 is connected to the steam outlet 18.

[0044] Preferably, it includes: a first waste water source interface 81, a second waste water source interface 82, a waste water source input circulation pump 83, a heating circulation pump 85, a waste water source heating heat exchanger 106, a water source heat pump evaporator 87, a refrigeration compressor 88, a water source heat pump condenser 89, an expansion valve 90, a water source heat pump hot water circulation pump 91, a pure water or softened water preheating tank 92, and a pure water or softened water input interface 93;

[0045] One end of the primary side of the waste water source heating heat exchanger 106 is connected to the water source of the water source heat pump through the first waste water source interface 81. The other end of the primary side of the waste water source heating heat exchanger 106 is connected to one end of the water side of the water source heat pump evaporator 87. The other end of the water side of the water source heat pump evaporator 87 is connected to one end of the waste water source input circulation pump 83. The other end of the waste water source input circulation pump 83 is connected to the water source of the water source heat pump through the second waste water source interface 82.

[0046] One end of the secondary side of the waste water source heating heat exchanger 106 is connected to one end of the water source heat pump hot water circulation pump 91 and one end of the pure water or softened water preheating tank 92, respectively. The other end of the water source heat pump hot water circulation pump 91 is connected to one end of the water side of the water source heat pump condenser 89. The other end of the water side of the water source heat pump condenser 89 is connected to one end of the heating circulation pump 85 and one end of the pure water or softened water preheating tank 92. The other end of the heating circulation pump 85 is connected to the other end of the secondary side of the waste water source heating heat exchanger 106.

[0047] One end of the water source heat pump evaporator 87 on the refrigerant side is connected to the suction end of the refrigeration compressor 88, the discharge end of the refrigeration compressor 88 is connected to one end of the water source heat pump condenser 89 on the refrigerant side, the other end of the water source heat pump condenser 89 on the refrigerant side is connected to one end of the expansion valve 90, and the other end of the expansion valve 90 is connected to the other end of the water source heat pump evaporator 87 on the refrigerant side.

[0048] Preferably, it includes: a water pump 96, a waste heat source input circulation pump 100, a refrigeration compressor 102, a water source heat pump evaporator 103, a water source heat pump condenser 104, and an expansion valve 105;

[0049] One end of the water pump 96 is connected to the preheating tank 92 for pure water or softened water, and the other end of the water pump 96 is connected to one end of the first-stage molten salt heat exchange output device 5.

[0050] One end of the water-side of the water source heat pump evaporator 103 is connected to the water source of the water source heat pump via the first waste water source interface 81. The other end of the water-side of the water source heat pump evaporator 103 is connected to the water source of the water source heat pump via the second waste water source interface 82 through the waste water source input circulation pump 100. One end of the refrigerant side of the water source heat pump evaporator 103 is connected to the suction end of the refrigeration compressor 102. The discharge end of the refrigeration compressor 102 is connected to one end of the refrigerant side of the water source heat pump condenser 104. The other end of the refrigerant side of the water source heat pump condenser 104 is connected to the other end of the refrigerant side of the water source heat pump evaporator 103 via the expansion valve 105. One end of the water-side of the water source heat pump condenser 104 is connected to one end of the waste water source heating tank 86. The other end of the water-side of the water source heat pump condenser 104 is connected to the other end of the waste water source heating tank 86 via the heating circulation pump 85.

[0051] Preferably, it includes: a molten salt heat storage tank 1, molten salt 2, a molten salt heat exchange output device 5, and a vehicle 81;

[0052] The molten salt 2 is disposed inside the molten salt heat storage tank 1, the molten salt heat exchange output device 5 is immersed in the molten salt 2, and the molten salt heat storage tank 1 is disposed on top of the vehicle 81.

[0053] Beneficial effects:

[0054] A large-scale, innovative heat exchange device is directly installed inside the molten salt thermal storage tank, forming an integrated energy storage and heat exchange system with molten salt pump-free circulating output heating. This system achieves a simplified, independent unit system for energy storage and heating output without molten salt circulating pumps and high-temperature molten salt heat exchangers. This simplified energy storage and heat exchange output heating unit system without molten salt circulating pumps and high-temperature molten salt heat exchangers can not only be applied in thermal power plants to achieve stable, simple, low-cost, and real-time peak-shaving and valley-filling operation, avoiding frequent adjustments to boilers, turbines, and generators, but also utilizes electric thermal energy storage to store excess electricity. The stored heat can then be used to generate steam during peak electricity demand for power generation or directly output as heat for heating, ensuring stable and safe power generation unaffected by grid peak-valley impacts. Furthermore, it can be used as a user-side valley-side electric thermal energy storage heating application, avoiding the problem of frequent boiler steam output adjustments during peak-shaving and valley-filling in thermal power plants, ensuring stable and efficient power generation from thermal power plants and balancing the power grid's power supply system. If a large number of thermal power plants and grid user-side energy storage and heating systems are deployed, peak shaving and valley filling can be achieved at low cost and high efficiency, balancing the power generation and supply system for stable operation. This will improve the efficiency of wind and solar power generation, thermal power generation, and power supply operations, enabling grid users to absorb off-peak electricity, improving enterprise operating efficiency, benefiting people's affordable living, and enhancing the overall coordinated economic development of society, thus possessing considerable practical value. Attached Figure Description

[0055] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0056] Appendix Figure 1 This is a schematic diagram of an embodiment of the electric heating tube heating molten salt energy storage device of this utility model.

[0057] Appendix Figure 2 This is a schematic diagram of an embodiment of the molten salt energy storage and heat exchange device for medium circulation output of this utility model.

[0058] Appendix Figure 3 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt heat storage heat exchange circulation output heating device without molten salt pump.

[0059] Appendix Figure 4 This is a schematic diagram of an embodiment of the single-phase power supply electric heating tube heating molten salt heat storage heat exchange circulation output heating device without molten salt pump of this utility model.

[0060] Appendix Figure 5 This is a schematic diagram of an embodiment of the steam-heated molten salt heat storage heat exchange and circulation output heating device of this utility model.

[0061] Appendix Figure 6 This is a schematic diagram of an embodiment of the high-temperature waste heat flue gas or flame heating molten salt heat storage heat exchange circulation output heating device without molten salt pump.

[0062] Appendix Figure 7 This is a schematic diagram of an embodiment of the external heat exchange coil of the molten salt heat storage tank of this utility model, which provides heat exchange circulation output without a molten salt pump.

[0063] Appendix Figure 8 This is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt heat storage heat exchange circulation output heating device of this utility model.

[0064] Appendix Figure 9 This is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt external water jacket heat exchange heating and heating device without molten salt pump of this utility model.

[0065] Appendix Figure 10 This is a schematic diagram of an embodiment of the steam supply system for a three-phase power supply electric heating tube heating molten salt heat storage heat exchanger circulating steam boiler without molten salt pump.

[0066] Appendix Figure 11 This is a schematic diagram of an embodiment of the steam supply system for a three-phase power supply electric heating tube heating molten salt heat storage system without molten salt pump, heat exchange circulation steam, waste steam, condensate recovery steam boiler.

[0067] Appendix Figure 12 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt heat storage heat exchange circulating hot water boiler heating system of this utility model.

[0068] Appendix Figure 13 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt heat storage heat exchanger without molten salt pump external heat exchange coil heating and heating device of this utility model.

[0069] Appendix Figure 14 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt internal and external heat exchange heat device of this utility model for hot water heating and steam supply.

[0070] Appendix Figure 15 This is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt heat storage system without a molten salt pump for heat exchange and steam output.

[0071] Appendix Figure 16 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt external preheating heat exchange steam generation device of this utility model.

[0072] Appendix Figure 17 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating first-stage molten salt heat storage preheating wet steam and second-stage molten salt dry steam generation system of this utility model.

[0073] Appendix Figure 18 This is a schematic diagram of an embodiment of the adjustable water source heat pump outlet water temperature preheating electromagnetic induction heating steam generator of this utility model.

[0074] Appendix Figure 19 This is a schematic diagram of an embodiment of the present invention, which utilizes a water source heat pump to adjust the outlet water temperature of the water source heat pump and preheat the electromagnetic induction heating steam generator.

[0075] Appendix Figure 20 This is a schematic diagram of an embodiment of the present invention: a three-phase power supply electric heating tube for heating molten salt heat storage without a molten salt pump, heat exchange circulation output for vehicle-mounted mobile energy storage and heating.

[0076] Explanation of reference numerals in the attached figures:

[0077] 1. Molten salt heat storage tank; 2. Molten salt; 3. Electric heating device; 4. Power supply; 5. Molten salt heat exchange output device; 6. Molten salt heat exchange output device interface; 7. Molten salt heat exchange output device interface; 8. Steam heating heat exchanger; 9. Steam heating heat exchanger interface; 10. Steam heating heat exchanger interface; 11. Flue gas or flame heat exchange tube; 12. Flue gas or flame inlet; 13. Flue gas or flame outlet; 14. Flue gas or flame; 15. Water pump; 16. Water inlet; 17. Check valve; 18. Steam outlet; 19. Valve; 20. Safety valve; 21. Exhaust pipe; 22. Electromagnetic or electric valve; 23. Check valve; 24. Water tank; 25. Water; 26. Gas-water mixer; 27. Water tank inlet / outlet interface; 28. Safety valve; 29. ​​Exhaust pipe. 30. Gas pipe, 31. Heating circulation pump, 32. Radiator, 33. Fan coil unit, 34. Hot water outlet, 35. Tap water interface, 36. Expansion tank, 37. Water, 38. Float valve, 39. Gas-liquid mixer, 40. Water supply interface, 41. Valve, 42. Safety valve, 43. Exhaust pipe, 44. Heat exchanger interface, 45. External heat exchanger, 46. Check valve, 47. Insulation layer between electromagnetic induction coil and molten salt storage tank, 48. Electromagnetic induction coil, 49. First electromagnetic induction coil terminal, 50. Second electromagnetic induction coil terminal, 51. First electromagnetic induction generator terminal, 52. Second electromagnetic induction generator terminal, 53. Electromagnetic induction generator, 54. 55. Electromagnetic induction generator power supply; 56. External water jacket heat exchanger; 57. First external water jacket heat exchanger interface; 58. Second external water jacket heat exchanger interface; 59. External water jacket heat exchanger water channel; 60. Heat exchanger tube fixing plate; 61. Heat exchanger tube expansion and / or welding joint; 62. Heat exchanger tube inlet and outlet medium separator plate; 63. Heat exchanger tube inlet and outlet medium cap; 64. Heat exchanger tube fixing plate flange; 65. Heat exchanger tube fixing device; 66. Heat exchanger U-tube; 67. Medium inlet; 68. Medium outlet; 69. Insulation material; 70. Automobile; 71. Softened water or pure water interface; 72. Water pump; 73. Check valve; 74. Check valve; 75. Safety valve; 76. Exhaust pipe; 77. Valve; 78. Steam output interface; 79. 9. Safety valve; 80. Exhaust pipe; 81. First waste water source interface; 82. Second waste water source interface; 83. Waste water source input circulation pump; 84. Waste water source valve; 85. Heating circulation pump; 86. Waste water source heating tank; 87. Water source heat pump evaporator; 88. Refrigeration compressor; 89. Water source heat pump condenser; 90. Expansion valve; 91. Water source heat pump hot water circulation pump; 92. Pure water or softened water preheating tank; 93. Pure water or softened water input interface; 94. Safety valve; 95. Exhaust pipe; 96. Water pump; 97. Check valve; 98. Safety valve; 99. Exhaust pipe; 100. Waste water source input circulation pump; 101. Waste water source valve; 102. Refrigeration compressor; 103. Water source heat pump evaporator.104. Water source heat pump condenser; 105. Expansion valve; 106. Heat exchanger. Detailed Implementation

[0078] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0079] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0081] Appendix Figure 1 This is a schematic diagram of an embodiment of the electric heating tube heating molten salt energy storage device of this utility model. (Attached) Figure 1 The device consists of a molten salt storage tank 1, molten salt 2, an electric heating device 3, and a power source 4, forming an electrothermal molten salt energy storage device. (See attached diagram.) Figure 1In this process, molten salt 2 is placed in a molten salt storage tank 1 and immersed in it. The electric heating device 3 is powered by a three-phase AC power source 4. When the power is turned on, the electric heating device 3 generates high-temperature heat to heat the solid molten salt 2. When the temperature exceeds the freezing point of the molten salt 2, the solid molten salt 2 changes phase to liquid molten salt 2. During the phase change process, a large amount of heat is stored in the molten salt, completing the process of converting electrical energy into heat energy. A large amount of electrical energy is stored as heat in the molten salt storage tank 1, realizing molten salt electrothermal energy storage.

[0082] Molten salt electrothermal energy storage has the advantages of large energy storage capacity, high safety, strong controllability, and can change from solid to liquid state at high temperatures up to 600℃ while remaining at normal pressure, and has excellent fluidity.

[0083] Appendix Figure 2 This is a schematic diagram of an embodiment of the molten salt heat exchange output device of this utility model. (Attached) Figure 2 The molten salt heat exchange output device consists of a molten salt heat exchange output device 5, a heat exchange tube fixing plate 59, a heat exchange tube expansion and / or welding joint 60, a heat exchange tube inlet and outlet medium separation plate 61, a heat exchange tube inlet and outlet medium sealing cap 62, a heat exchange tube fixing plate flange 63, a heat exchange U-shaped tube 65, a medium inlet 66, and a medium outlet 67.

[0084] The molten salt heat exchange output device 5 consists of at least one or more sets of heat exchange U-shaped tube bundles, which are fixedly connected to the heat exchange tube expansion joints and / or welded joints 60 by heat exchange tube fixing plates 59. A heat exchange tube inlet / outlet media separator 61 separates and isolates the medium inlet 66 and medium outlet 67 of the heat exchange U-shaped tubes 65. The heat exchange U-shaped tube bundles 65 are reinforced and fixed by heat exchange tube fixing devices 64. In the large molten salt heat exchange output device 5, the heat exchange tube fixing devices 64 and auxiliary supports are used to jointly fix the molten salt heat exchange output device 5, thereby enhancing the impact resistance and stable and reliable operation of the ultra-large molten salt heat exchange output device 5.

[0085] The molten salt heat exchange output device 5 can also be installed horizontally inside the molten salt heat storage tank 1, and its effect is the same as that of vertical installation. Users can flexibly decide how to configure the molten salt heat exchange output device 5 according to their needs.

[0086] The liquid molten salt 2, in contact with the surface of the heat exchange tube bundle assembly, exchanges heat with the medium flowing within the heat exchange tube bundle assembly through the molten salt heat exchange output device 5. The medium can be heat transfer oil, water, pure water, softened water, or steam. The medium enters the molten salt heat exchange output device 5 through the medium inlet 66 and is heated by the high-temperature liquid molten salt 2. The superheated medium is then output from the medium outlet 67 as heated superheated heat transfer oil, superheated water, saturated steam, or superheated steam for heating applications. This process eliminates the complex and expensive circulation output system and heat loss associated with high-temperature molten salt circulation pumps, high-temperature molten salt circulation pipes, and high-temperature molten salt heat exchangers, resulting in significant energy conservation and emission reduction.

[0087] Appendix Figure 3This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt energy storage heat exchange device of this utility model. (Attached) Figure 1 The system comprises a molten salt storage tank 1, molten salt 2, an electric heating device 3, a power supply 4, a molten salt heat exchange output device 5, a molten salt heat exchange output device interface 6, and a molten salt heat exchange output device interface 7, forming a three-phase power-driven molten salt heat storage and molten salt heat exchange output device. The molten salt storage tank 1 is made of high-temperature resistant and corrosion-resistant metal material, and is equipped with insulation material 68 on its exterior, which is further protected by a water-resistant and anti-fouling layer.

[0088] Figure 3 In this system, the electric heating device 3 consists of heating tubes connected to a three-phase power supply system. When the three-phase power supply 4 supplies power to the electric heating device 3, the heating tubes generate high-temperature heat, which heats the solid molten salt 2. Because the electric heating device 3 is immersed in the solid molten salt 2, the solid molten salt 2 is heated in contact with the surface of the electric heating device 3. Due to the excellent thermal conductivity of the molten salt 2, its fluidity and thermal resistance are extremely low. When the solid molten salt 2 is heated, its temperature rises to a certain level, and it begins to change from a solid molten salt phase to a liquid molten salt 2. In this process, a large amount of electrical energy is converted into heat and stored in the liquid molten salt 2. The liquid molten salt 2 has excellent energy storage effect, and its pressure is basically at atmospheric pressure. Its fluidity and thermal conductivity are also excellent.

[0089] Appendix Figure 3 This system can be applied in power plants for peak shaving and valley filling, adjusting the power supply balance by storing excess electricity as heat. This simplifies the power plant's peak shaving and valley filling system, making it easy to operate, safe, and reliable, without requiring large-scale investment. It can also realize a peak shaving and valley filling system for thermal power plants. After the excess electricity is stored, it exchanges heat with liquid molten salt 2 through molten salt heat exchange output device 5, and then connects to external steam, hot water, or thermal oil via molten salt heat exchange output device interface 6 and interface 7 to directly utilize the molten salt heat for thermal energy. Adding clean water outputs hot water, adding purified water or softened water outputs steam, and adding thermal oil outputs high-temperature, low-pressure heat for cyclical application. Specific application scenarios involve external hot water, steam, or thermal oil pipelines, and auxiliary equipment systems completing energy storage, heat exchange, and molten salt pump-free cyclical output utilization systems for heating or industrial high-temperature heat applications. Since external hot water, steam, or thermal oil pipelines and auxiliary equipment systems are not within the scope of this utility model, they will not be described in detail.

[0090] In the appendix Figure 3In this system, electrical energy is converted into heat energy by an electric heating device 3 and stored in the molten salt heat storage tank 1. The stored heat is then transferred to the appropriate location via a molten salt heat exchanger output device 5, and output directly to any location requiring heat, eliminating the need for a complex system that circulates the high-temperature liquid molten salt through a high-temperature molten salt pump to a high-temperature solution heat exchanger. The heat exchanger outputs the heat converted and stored by electrical energy from the molten salt heat storage tank 1 by directly exchanging heat between the circulating medium and the high-temperature liquid molten salt 2 through the molten salt heat exchanger 5 within the molten salt storage tank. (Appendix) Figure 3 The molten salt heat exchanger, through a 5-medium circulating output energy storage system, achieves the goals of energy storage, heat exchange, and thermal energy output in a simple, easy, and perfect manner. This saves a significant amount of initial investment for molten salt energy storage systems and also reduces heat loss from the molten salt pump circulation piping system.

[0091] Appendix Figure 3 In this process, molten salt 2 can be a binary molten salt, a ternary molten salt, or liquid metal. The electric heating device 3 is equipped with a flange-type electric heating tube assembly according to its capacity, which is connected to the flange of the molten salt storage tank 1 for easy disassembly and maintenance of the electric heating tube assembly.

[0092] The electric heating device 3 can also be installed horizontally, depending on the application.

[0093] The molten salt heat exchange output device 5 inside the molten salt thermal storage tank 1 is connected to the flange of the molten salt thermal storage tank 1 via a flange, which facilitates hoisting, disassembly, inspection, replacement, and maintenance, ensuring the safe operation of molten salt energy storage, heat exchange, and heat output. Depending on the capacity of the molten salt thermal storage tank 1, at least one or more sets of molten salt heat exchange output devices 5 constitute a molten salt thermal storage and heat exchange system for medium circulation and heat output.

[0094] Appendix Figure 4 This is a schematic diagram of an embodiment of the single-phase power supply electric heating tube heating molten salt energy storage heat exchange device of this invention. (Attached) Figure 4 With appendix Figure 3 The only difference lies in the power supply method of power supply 4. Figure 4 This is a wiring method that supplies power to the heating element of the electric heating device 3 via a single-phase power supply. It is suitable for households with single-phase electricity and uses a single-phase power supply connection method. Figure 3 Suitable for three-phase industrial applications. (Attached) Figure 4 Suitable for locations with only single-phase electricity and no three-phase electricity. If three-phase electricity is available, the attached device should be used preferentially. Figure 3 Energy storage heat exchange device.

[0095] Appendix Figure 5 This is a schematic diagram of an embodiment of the steam-heated molten salt energy storage heat exchange device of this utility model. (Attached) Figure 5 With appendix Figure 3The difference lies in the steam-heated heat exchanger 8, which replaces the electric heating device 3 and the power supply 4. Steam, industrial waste heat steam, or high-temperature saturated hot water can be used to transfer waste heat to the steam-heated heat exchanger 8 to heat the solid molten salt 2. Other heating processes are similar to those described above. Figure 3 The same applies. Waste heat steam or high-temperature saturated hot water enters and exits the circulation system through steam heating heat exchanger interface 9 and steam heating heat exchanger interface 10. Steam or high-temperature saturated hot water below the freezing point temperature of molten salt 2 cannot heat the molten salt for utilization, thus affecting the overall efficiency. This loss and efficiency should be considered during application. The freezing point temperature of commonly used binary molten salts is around 220℃, that of ternary molten salts is around 140℃, and that of lithium nitrate mixed salts is around 120℃. Waste heat steam or high-temperature saturated hot water below the above freezing point temperature cannot heat the molten salt for utilization.

[0096] Appendix Figure 6 This is a schematic diagram of an embodiment of the high-temperature waste heat flue gas or flame heating molten salt heat storage heat exchange circulation output heating device of this utility model. (Attached) Figure 5 It involves immersing a flue gas or flame heat exchange tube 11 inside molten salt 2 to form a high-temperature flue gas or flame waste heat storage and heat exchange output utilization.

[0097] The flue gas or flame 14 can be high-temperature flue gas from an industrial boiler or waste heat from combustion in a chemical or oil refinery. The waste heat from the flue gas or flame enters through a pipe connected to the flue gas or flame inlet 12. The high-temperature flue gas or flame entering through inlet 12 passes through the flue gas or flame heat exchange tube 11. Utilizing the waste heat, the high-temperature flue gas or flame 14 heats the molten salt 2 by passing through the outer wall of the flue gas or flame heat exchange tube 11, which is immersed in molten salt 2. The subcooled flue gas or flame 14 is discharged through outlet 13. Other related to the appendix... Figure 1 same.

[0098] Appendix Figure 7 This is a schematic diagram of an embodiment of the heat exchange circulation output and heating of an external heat exchange coil without a molten salt pump in a molten salt thermal storage tank according to this utility model. (Attached) Figure 7 In this system, the external energy storage and heat exchange output device of the molten salt heat storage tank 1 is composed of heat exchanger interface 43, heat exchanger interface 44, and external heat exchanger 45. The external heat exchanger 45 should be configured to have good contact with the outer surface of the molten salt heat storage tank 1 to enhance the heat exchange effect between the external heat exchanger 45 and the tank body of the molten salt heat storage tank 1. Ideally, a welded zero-thermal-resistance connection method should be used. Alternatively, an outer tank body can be placed outside the molten salt heat storage tank 1, forming a medium channel circulation heat exchange gap between the two tank bodies. The medium exchanges heat with the surface of the molten salt heat storage tank 1 through the medium, which in turn exchanges heat with the high-temperature liquid molten salt inside the tank body. The medium within the heat exchange gap is connected to the heating system through heat exchanger interface 43 and heat exchanger interface 44 to utilize the stored heat.

[0099] Appendix Figure 7With its simple structure, it is well-suited for small-scale off-peak electricity storage for heating in residential applications. Three-phase power is advantageous for balancing three-phase power supplies; single-phase power can be used even without three-phase power, but single-phase operation draws more current than three-phase operation, especially during startup.

[0100] Appendix Figure 8 This is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt heat storage heat exchange circulation output heating device of this utility model. (Attached) Figure 8 Although the heating method also uses electricity, it does not employ an electric heating element but rather uses electromagnetic induction. When an alternating current flows through the electromagnetic induction coil 48, an alternating magnetic field is generated around it. This magnetic field induces eddy currents inside the metal tank of the molten salt storage tank 1. As these eddy currents flow within the metal tank, they generate heat through friction with the resistance, based on the Joule heating effect, thus converting electrical energy into thermal energy. Its advantages include high thermal efficiency, rapid heating, low energy loss, and non-contact heating. Therefore, it has a longer lifespan than electric heating elements. The molten salt storage tank 1 should be made of a similar cast iron metal material, which has high electromagnetic induction heating efficiency. Alternatively, it can be made of ferrous stainless steel (type 430) with high electromagnetic induction heating efficiency to enhance the corrosion effect of the molten salt on the metal material.

[0101] The electromagnetic induction generator power supply 54 inputs three-phase AC power to the electromagnetic induction generator 53, which is rectified into DC power. By controlling the frequency of the high-frequency oscillator, the DC power is inverted to generate a 20~50kHz high-frequency alternating current. This current flows through the first electromagnetic induction generator terminal 51 and the second electromagnetic induction generator terminal 52, and then through the first electromagnetic induction coil terminal 40 and the second electromagnetic induction coil terminal 50 to generate a high-frequency alternating magnetic field in the electromagnetic induction coil 48. This completes the electromagnetic induction heating of the molten salt heat storage tank 1, which then directly heats the molten salt 2, realizing the conversion of electrical energy into heat energy and energy storage. Finally, the stored molten salt heat is output through the molten salt heat exchange device 5 for application.

[0102] Since the electromagnetic induction coil 48 and the molten salt storage tank 1 need to have a certain distance, the required distance for electromagnetic induction is achieved by configuring a heat insulation layer 47 between the electromagnetic induction coil and the molten salt storage tank, adjusting the thickness of the heat insulation layer 47, and then winding the electromagnetic induction coil 48 around the outside of the heat insulation layer 47 between the electromagnetic induction coil and the molten salt storage tank.

[0103] Appendix Figure 9 This is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt external water jacket heat exchange heating device without molten salt pump of this utility model. (Attached) Figure 9An external water jacket heat exchanger 55 is configured, and the external water jacket heat exchanger 55 is welded to the molten salt heat storage tank 1 to form an external water jacket heat exchanger channel 58. The medium in the external water jacket heat exchanger channel 58 exchanges heat with the molten salt heat storage tank 1. If the unit is used for heating and hot water supply, the medium enters from the first external water jacket heat exchanger interface 56, is heated by the high-temperature liquid molten salt 2 in the molten salt heat storage tank 1, and then flows out through the second external water jacket heat exchanger interface 57 for circulation output, thus completing the heating supply.

[0104] An external water jacket heat exchanger 55 is disposed outside the molten salt heat storage tank 1. The external water jacket heat exchanger channel 58 is connected to the outer surface of the molten salt heat storage tank 1 with zero thermal resistance or by welding. The first external water jacket heat exchanger interface 56 and the second external water jacket heat exchanger interface 57 are connected to the external water jacket heat exchanger channel 58.

[0105] The external water jacket heat exchanger channel 58 can also be welded with baffles to divide the overall external water jacket heat exchanger channel 58 into spiral channels, similar to the spiral channel circulating heat exchange channels of a pipe coil heat exchanger, thereby improving heat exchange. The medium inside the external water jacket heat exchanger channel 5 can be water, steam, or heat transfer oil circulating to output heat.

[0106] Appendix Figure 10 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt heat storage heat exchange circulating steam boiler steam supply system without molten salt pump, according to this utility model. (Attached) Figure 10 Softened or purified water is pumped in through inlet 16 by pump 15. The pump generates high-pressure water that circulates through check valve 17 and enters molten salt heat exchanger 5 through interface 6. Heated by the high-temperature molten salt, steam is generated. The steam flow is regulated by valve 19 through interface 7 and output through steam outlet 18. Safety valve 20 is a safety feature for the steam system. If the steam pressure exceeds the safety setpoint, safety valve 20 opens, and the overpressure steam is discharged to the atmosphere through exhaust pipe 21, ensuring the safe operation of the water and steam systems.

[0107] The check valve 17 is a one-way valve, allowing only outflow and preventing backflow. This ensures that the water pump 15 delivers softened or purified water to the molten salt heat exchanger output device 5, without the water flowing back from the molten salt heat exchanger output device 5 to the water pump 15. The water pump 15 is selected as a high-pressure multistage water pump based on the steam pressure.

[0108] Appendix Figure 10 It is the most basic electric thermal energy storage steam generator, which can be customized according to the attached... Figure 3 Appendix Figure 4 Appendix Figure 5 Appendix Figure 6 and attached Figure 7 This constitutes various large-scale waste heat storage steam boilers. (Attached) Figure 10Utilize off-peak electricity at night to replace coal, oil, and gas boilers, or directly adopt green wind and solar power, as well as combine off-peak electricity supply with grid power supply, and apply waste heat and environmentally friendly energy storage.

[0109] Appendix Figure 11 This is a schematic diagram of an embodiment of the steam supply system for a three-phase power supply electric heating tube heating molten salt heat storage system without a molten salt pump, featuring heat exchange circulation, waste steam, and condensate recovery. (Attached) Figure 11 It is attached Figure 10 Based on this, an electromagnetic or electric valve 22, a check valve 23, a water tank 24, water 25, a gas-water mixer 26, a water tank inlet / outlet interface 27, a safety valve 28, and an exhaust pipe 29 are configured to form a pressure relief steam recovery device. When steam output stops and water pump 15 stops supplying water, the steam pressure inside the molten salt heat exchanger output device 5 continues to rise due to the high-temperature molten salt continuing to heat it. Under normal circumstances, safety protection is achieved by opening the safety valve 20 to release the overpressure steam to the atmosphere through the exhaust pipe 21 for pressure relief protection. However, a large amount of steam is wasted by being discharged. By using a pressure sensor to set a pressure value lower than the working pressure of the safety valve 20, the electromagnetic or electric valve 22 is opened before it is opened. This allows the electromagnetic or electric valve 22 to be automatically controlled in advance, introducing steam into the gas-water mixer 26 through the check valve 23. The steam is then released into the water 25 in the water tank 24 through the gas-water mixer 26 without bubbles and with low noise, mixing with the water to form water. The gas-water mixer 26 eliminates water explosion noise, recovers steam waste heat, and achieves quiet operation.

[0110] Appendix Figure 12 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt heat storage heat exchange circulating hot water boiler heating system of this utility model. (Attached) Figure 12 It is attached Figure 10 Based on this, a heating circulation pump 30, radiators 31, fan coil units 32, hot water outlet 33, tap water interface 34, expansion tank 35, water 36, float valve 37, gas-liquid mixer 38, water supply interface 39, valve 40, safety valve 41 and exhaust pipe 42 are configured to form an example of electric energy storage hot water heating application.

[0111] Wind and solar power generation, or during off-peak hours at night, heat is generated by heating molten salt in a molten salt thermal storage tank (tank 1). Heating water from radiators (31) and / or fan coil units (32) and / or hot water outlets (33) is circulated via a heating circulation pump (30). This molten salt heat exchanger output device flows through interface 7 and interface 6, then through interface 5, where it is heated by the molten salt. The heated water then circulates back into radiators (31) and / or fan coil units (32) and / or hot water outlets (33), releasing heat into the room to heat the air and achieve heating operation. Alternatively, hot water can be output through hot water outlets (33) or configured independently for single-application hot water output.

[0112] The expansion tank 35 plays a crucial role in the safe operation of the heating system. If the system pressure rises, it releases pressure through the gas-liquid mixer 38 into the water tank 36. Tap water is introduced through the water inlet 39 and supplied to the expansion tank 35 via valve 40 and float valve 37. The safety valve 41 and vent pipe 42 provide safety protection.

[0113] Appendix Figure 13 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt heat storage heat exchanger without molten salt pump, external heat exchange coil heating and heating device of this utility model. (Attached) Figure 13 It is attached Figure 7 Based on this, a heating circulation pump 30, radiators 31, fan coil units 32, hot water outlet 33, tap water interface 34, expansion tank 35, water 36, float valve 37, gas-liquid mixer 38, water supply interface 39, valve 40, safety valve 41, and exhaust pipe 42 are configured to form an electric energy storage hot water heating system application example. Its operation process involves heat exchange between the external heat exchanger 45 and the molten salt 2 inside the molten salt storage tank 1, followed by circulation via the heating circulation pump 30 through the heat exchanger interface 43 and 44 and check valve 46. The heating process is similar to the attached... Figure 12 The same applies, so I will not repeat it here. Safety valve 41 and exhaust pipe 42 serve a safety protection function.

[0114] Appendix Figure 14 This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt internal and external heat exchange heat device of this utility model, which provides hot water heating, heat supply and steam supply. (Attached) Figure 14 It is attached Figure 13 Based on this, a molten salt heat exchanger output device 5 is configured to generate steam or high-temperature hot water. This steam or hot water is then used for heating via an external heat exchanger 45 with low-temperature water. This dual-mode operation allows for both steam production and heating, expanding the application range. Its operation process is similar to that of the attached... Figure 13 and attached Figure 12 The same applies, so I will not elaborate further.

[0115] Appendix Figure 15 This is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt heat storage system with a pump-free heat exchange and steam output. (Attached) Figure 15 It is attached Figure 8 Based on this, a molten salt heat exchanger output device 5 is configured. Steam or high-temperature hot water is generated through the molten salt heat exchanger output device 5 to form a large-scale electromagnetic induction heating energy storage heat exchanger output steam system, or a large-scale electromagnetic induction steam boiler. Its working process is similar to that of the attached... Figure 8 and 10 The same applies, so I will not repeat it.

[0116] Appendix Figure 16This is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt external displacement heat preheating steam generator of this utility model. (Attached) Figure 16 It is attached Figure 14 The heating system is removed from the basic system, and the external heat exchanger 45 is used as a preheating heat exchanger for the steam boiler to heat the softened water or purified water input to the molten salt heat exchange output device 5. The softened water or purified water enters through the water interface 70, the water pump 71, the check valve 74, and the heat exchanger interface 43. It first exchanges heat with the high-temperature liquid molten salt 2 in the molten salt storage tank 1 through the external heat exchanger 45, heating it to the required preheating temperature. It is then output from the heat exchanger interface 44, passes through the check valve 73, and enters the molten salt heat exchange output device 5 for further high-temperature heating until steam is produced. The steam flow rate is regulated by the valve 19, and the steam is output from the steam outlet 18. The safety valve 20 and the exhaust pipe 21 constitute a safety operation protection device.

[0117] Appendix Figure 17 A schematic diagram of an embodiment of this utility model's three-phase power supply heating element system for heating first-stage molten salt thermal storage and second-stage molten salt dry steam. (Attached) Figure 17 It is attached Figure 16 Based on the existing system, a first-stage molten salt thermal storage and heating device is added to form a two-stage molten salt thermal storage and heating system for generating dry steam. Softened water or purified water is preheated by an external heat exchanger 45, then enters the first-stage molten salt heat exchange output device 5 via check valve 73 and is heated to saturated steam, or to steam with a certain humidity at approximately 350℃. It is then sent to the second-stage molten salt heat exchange output device 5 via check valve 74 for further heating and output to superheated dry steam at 540℃, or supercritical steam at 600℃. When using supercritical power generation at 600℃, the temperature of the molten salt heat 2 stored in the second-stage molten salt thermal storage tank 1 should be ≥600℃. The maximum safe operating temperature for binary molten salt is below 600℃. Currently, molten salts above 600℃ require higher-standard corrosion-resistant materials because fluoride molten salts have stability up to 800℃ or higher, but the molten salt tank body metal material needs to be made of Hastelloy. Chloride molten salts have a melting point of 380℃ and thermal stability up to 800℃, but require ceramic or nickel-based alloys to manufacture the molten salt storage tank 1. The material for the molten salt storage tank 1 should be selected appropriately based on the dry steam temperature, and even higher temperature output requirements can be achieved.

[0118] Appendix Figure 17 In this system, check valves 72, 73, and 74, safety valve 75, vent pipe 76, safety valve 79, and vent pipe 80 are all components configured to ensure the safety of the steam system. Steam is output through valve 77 and steam output port 78.

[0119] Appendix Figure 17Alternatively, instead of using an external heat exchanger 45 to preheat pure water or softened water, one can use any type of heat storage heating device of the present invention with an independent configuration, which preheats pure water or softened water through a medium circulation output heat storage heat exchange system, or use any other form of energy-saving preheating system to preheat pure water or softened water.

[0120] Appendix Figure 18 This is a schematic diagram of an embodiment of the adjustable water source heat pump outlet water temperature preheating electromagnetic induction heating steam generator of this utility model. (Attached) Figure 18 The system comprises a first waste water source interface 81, a second waste water source interface 82, a waste water source input circulation pump 83, a waste water source valve 84, a heating circulation pump 85, a waste water source heating heat exchanger 106, a water source heat pump evaporator 87, a refrigeration compressor 88, a water source heat pump condenser 89, an expansion valve 90, a water source heat pump hot water circulation pump 91, a pure water or softened water preheating tank 92, and a pure water or softened water input interface 93, which together constitute a water source heat pump heating system for pure water or softened water preheating.

[0121] In many scenarios with waste heat, utilizing waste heat as a source for water-source heat pumps can save energy by preheating softened or purified water. This is particularly relevant in oilfield production processes, which generate large amounts of oily wastewater at around 30°C. This vast amount of waste heat from such wastewater can serve as a valuable resource for water-source heat pump systems. Using oily wastewater-source heat pump systems to heat softened or purified water input from steam boilers is an ideal application for energy conservation and emission reduction.

[0122] Appendix Figure 18 In practice, due to the requirements of preheated water temperature, the output water temperature of water source heat pump units often cannot meet user needs. Therefore, an automatic adjustment system for the output water temperature of the water source heat pump unit is configured, consisting of a heating circulation pump 85 and a waste water source heating heat exchanger 106. The high-temperature hot water output from the water source heat pump unit is circulated from the primary side of the waste water source heating heat exchanger 106 to the secondary side of the same unit to heat the passing low-temperature water. A frequency converter controls the flow rate and velocity of the heating circulation pump 85, thereby controlling the temperature of the water flowing through the first waste water source interface 81 and achieving the required water source heat pump output temperature. Adjusting and raising the input water temperature of the water source heat pump can act as a lever; a small increase in the input water temperature can lead to a significant increase in the output water temperature of the water source heat pump unit.

[0123] Appendix Figure 19 This is a schematic diagram of an embodiment of the present invention, which utilizes a water source heat pump to adjust the outlet water temperature of the water source heat pump and preheat an electrically heated steam generator. (Attached) Figure 19 It is attached Figure 18 Based on this, an example is provided for configuring an independent water source heat pump unit to increase the input water temperature of the water source heat pump. (Attached) Figure 19The heating system for raising the input water temperature of the water source heat pump consists of a water pump 96, a check valve 97, a waste hot water source input circulation pump 100, a waste hot water source valve 101, a refrigeration compressor 102, a water source heat pump evaporator 103, a water source heat pump condenser 104, and an expansion valve 105.

[0124] Appendix Figure 19 In this process, the hot water source, heated by the hot water circulation pump 85 and circulated from the water source heat pump condenser 104 by the heating circulation pump 85, flows through the hot water source heating tank 86 to raise the output temperature of the high-temperature hot water from the water source heat pump condenser 89, which is necessary to reach the preheated outlet water temperature. The softened water or purified water that meets the preheating requirements is sent to the first-stage molten salt heat exchange output device 5 via the water pump 96 and check valve 97 and heated to saturated steam. Then, it is further heated by the second-stage molten salt heat exchange output device 5 and output to superheated dry steam at 540℃.

[0125] Appendix Figure 20 This is a schematic diagram of an embodiment of the present invention: a three-phase power supply electric heating tube heating molten salt heat storage system with no molten salt pump, heat exchange circulation output, and vehicle-mounted mobile energy storage heating. (Attached) Figure 20 It is attached Figure 1 To be continued Figure 8 When installed on motor vehicles, this creates a mobile vehicle-mounted energy storage application scenario. It allows for the direct application of surplus electricity stored as heat from wind and solar power plants that do not transmit power through the grid, as well as for the stable generation of thermal power plants through peak shaving and valley filling in power supply systems. Furthermore, it enables the transportation of heat energy by vehicle, facilitating its sale to users in need.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A molten salt thermal storage and heat exchange system that supplies heat through medium circulation, characterized in that, Including electrothermal molten salt energy storage devices; The electrothermal molten salt energy storage device includes a molten salt storage tank (1), molten salt (2), an electrothermal device (3), and a power source (4). Molten salt (2) is stored in a molten salt storage tank (1), and the molten salt storage tank (1) is equipped with the electric heating device (3) and immersed in the molten salt (2) inside the molten salt storage tank (1); It also includes a molten salt heat exchange output device; The molten salt heat exchange output device (5) includes: heat exchange tube fixing plate (59), heat exchange tube expansion and / or welding joint (60), heat exchange tube inlet and outlet medium separation plate (61), heat exchange tube inlet and outlet medium sealing cap (62), heat exchange tube fixing plate flange (63), heat exchange U-tube (65), medium inlet (66) and medium outlet (67). The heat exchange U-tube (65) consists of at least one or more U-tube bundles; The heat exchange U-shaped tube (65) is connected to the heat exchange tube fixing plate (59) through the heat exchange tube expansion and / or weld joint (60); The medium inlet (66) and medium outlet (67) of the heat exchange U-shaped tube (65) are separated and isolated by the medium inlet / outlet partition plate (61).

2. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation as described in claim 1, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), electric heating device (3), power supply (4) and molten salt heat exchange output device (5); The molten salt (2) is stored in the molten salt heat storage tank (1), the electric heating device (3) is disposed in the molten salt heat storage tank (1) and immersed in the molten salt (2), and the molten salt heat exchange output device (5) is disposed in the molten salt heat storage tank (1) and immersed in the molten salt (2); The power source (4) is a three-phase power source or a single-phase power source.

3. The molten salt thermal storage and heat exchange system for heat supply via medium circulation according to claim 1, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), molten salt heat exchange output device (5) and steam heat exchanger (8); The steam heat exchanger (8) is disposed inside the molten salt storage tank (1) and immersed in the molten salt (2).

4. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 1, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), flue gas or flame heat exchange tube (11), flue gas or flame (14). The flue gas or flame heat exchange tube (11) is disposed in the molten salt heat storage tank (1) and immersed in the molten salt (2).

5. The molten salt thermal storage and heat exchange system for heat supply via medium circulation according to claim 1, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), electric heating device (3), power supply (4) and external heat exchanger (45) of molten salt storage tank; The external heat exchanger (45) of the molten salt storage tank is disposed outside the molten salt heat storage tank (1) and is in close contact or welded to the outer surface of the molten salt heat storage tank (1) with zero thermal resistance.

6. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 1, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), molten salt heat exchange output device (5), high temperature resistant heat insulation material (47), electromagnetic induction coil (48), first electromagnetic induction coil terminal (49), second electromagnetic induction coil terminal (50), first electromagnetic induction generator terminal (51), second electromagnetic induction generator terminal (52), electromagnetic induction generator (53) and electromagnetic induction generator power supply (54); The high-temperature resistant heat insulation material (47) is tightly wrapped around the outside of the molten salt heat storage tank (1), and the electromagnetic induction coil (48) is wrapped around the outside of the high-temperature resistant heat insulation material (47). The first electromagnetic induction coil terminal (49) and the second electromagnetic induction coil terminal (50) are connected to the first electromagnetic induction generator terminal (51) and the second electromagnetic induction generator terminal (52). The electromagnetic induction generator (53) generates a high-frequency current, which is supplied to the electromagnetic induction coil (48) through the first electromagnetic induction generator terminal (51) and the second electromagnetic induction generator terminal (52), and then through the first electromagnetic induction coil terminal (49) and the second electromagnetic induction coil terminal (50).

7. The molten salt thermal storage and heat exchange system for heat supply via medium circulation according to claim 6, characterized in that, include: External water jacket heat exchanger (55), first external water jacket heat exchanger interface (56), second external water jacket heat exchanger interface (57) and external water jacket heat exchanger water channel (58); The external water jacket heat exchanger (55) is disposed outside the molten salt heat storage tank (1). The upper and lower ends of the external water jacket heat exchanger channel (58) are welded and sealed to the outside of the molten salt heat storage tank (1). The medium flowing in the external water jacket heat exchanger channel (58) is connected to the outer surface of the molten salt heat storage tank (1) for heat exchange. The first external water jacket heat exchanger interface (56) and the second external water jacket heat exchanger interface (57) are connected to the medium in the external water jacket heat exchanger channel (58).

8. The molten salt thermal storage and heat exchange system for heat supply via medium circulation according to claim 2, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), electric heating device (3), power supply (4), molten salt heat exchange output device (5), water pump, water interface (16) and steam outlet (18). One end of the water pump is connected to one end of the molten salt heat exchange output device (5), the other end of the water pump is connected to the water interface (16), and the other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

9. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 8, characterized in that, include: Water tank (24), water-air-water mixer and electromagnetic or electric valve (22); One end of the electromagnetic or electric valve (22) is connected to one end of the molten salt heat exchange output device (5) and the steam outlet (18), and the other end of the electromagnetic or electric valve (22) is connected to the gas-water mixer. The water is disposed inside the water tank (24), and the gas-water mixer is disposed inside the water.

10. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 2, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), electric heating device (3), power supply (4), molten salt heat exchange output device (5), heating circulation pump (30), radiators and / or floor heating pipes (31) and / or fan coil units (32) and / or hot water outlet (33), expansion tank (35), water, float valve (37) and gas-water mixer; One end of the heating circulation pump (30) is connected to one end of the radiator and / or the floor coil (31) and / or the fan coil (32) and / or the hot water outlet (33), and the other end of the heating circulation pump (30) is connected to one end of the molten salt heat exchange output device (5), and the other end of the molten salt heat exchange output device (5) is connected to the other end of the radiator and / or the floor coil (31) and / or the fan coil (32) and / or the hot water outlet (33) and the air-water mixer. The water is disposed in the expansion tank (35), and the gas-water mixer is disposed in the water in the expansion tank (35).

11. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 5, characterized in that, include: Heating circulation pump (30), radiators and / or floor heating coils (31) and / or fan coil units (32) and / or hot water outlets (33), gas-water mixers and external heat exchangers for molten salt storage tanks (45); One end of the heating circulation pump (30) is connected to one end of the external heat exchanger (45) of the molten salt storage tank, and one end of the radiator and / or the floor coil (31) and / or the fan coil unit (32) and / or the hot water outlet (33) and the gas-water mixer is connected to the other end of the external heat exchanger (45) of the molten salt storage tank.

12. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 1 or 11, characterized in that, include: Molten salt heat exchange output device (5), water pump, water interface (16) and steam outlet (18); One end of the water pump is connected to one end of the molten salt heat exchange output device (5), the other end of the water pump is connected to the water interface (16), and the other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

13. The molten salt thermal storage and heat exchange system for heat supply via medium circulation according to claim 6, characterized in that, include: Molten salt heat exchange output device (5), water pump, water interface (16) and steam outlet (18); One end of the water pump is connected to one end of the molten salt heat exchange output device (5), the other end of the water pump is connected to the water interface (16), and the other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

14. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 13, characterized in that, include: Molten salt heat exchange output device (5), steam outlet (18), molten salt storage tank external heat exchanger (45), water pump and pure water or softened water interface (70). The water pump is connected to one end of the external heat exchanger (45) of the molten salt storage tank, and the other end of the water pump is connected to the pure water or softened water interface (70). The other end of the external heat exchanger (45) of the molten salt storage tank is connected to one end of the molten salt heat exchange output device (5), and the other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

15. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 14, characterized in that, include: Second-stage molten salt heat storage tank (1), second-stage molten salt (2), second-stage electric heating device (3), second-stage power supply (4), second-stage molten salt heat exchange output device (5), first-stage molten salt heat storage tank (1), first-stage molten salt heat exchange output device (5), steam outlet (18), molten salt tank external heat exchanger (45), pure water or softened water interface (70) and water pump; The water pump is connected to one end of the external heat exchanger (45) of the molten salt storage tank, and the other end of the water pump is connected to the pure water or softened water interface (70). The other end of the external heat exchanger (45) of the molten salt storage tank is connected to one end of the first-stage molten salt heat exchange output device (5). The other end of the first-stage molten salt heat exchange output device (5) is connected to one end of the second-stage molten salt heat exchange output device (5). The other end of the second-stage molten salt heat exchange output device (5) is connected to the steam outlet (18).

16. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 13, characterized in that, include: First waste water source interface (81), second waste water source interface (82), waste water source input circulation pump, heating circulation pump (85), waste water source heating heat exchanger (106), water source heat pump evaporator, refrigeration compressor, water source heat pump condenser, expansion valve, water source heat pump hot water circulation pump (91), pure water or softened water preheating tank (92) and pure water or softened water input interface (93); One end of the primary side of the waste water source heating heat exchanger (106) is connected to the water source of the water source heat pump through the first waste water source interface (81), the other end of the primary side of the waste water source heating heat exchanger (106) is connected to one end of the water source heat pump evaporator, the other end of the water source heat pump evaporator is connected to one end of the waste water source input circulation pump, and the other end of the waste water source input circulation pump is connected to the water source of the water source heat pump through the second waste water source interface (82). One end of the secondary side of the waste water source heating heat exchanger (106) is connected to one end of the water source heat pump hot water circulation pump (91) and one end of the pure water or softened water preheating tank (92), respectively. The other end of the water source heat pump hot water circulation pump (91) is connected to one end of the water side of the water source heat pump condenser. The other end of the water side of the water source heat pump condenser is connected to one end of the heating circulation pump (85) and one end of the pure water or softened water preheating tank (92). The other end of the heating circulation pump (85) is connected to the other end of the secondary side of the waste water source heating heat exchanger (106). One end of the refrigerant side of the water source heat pump evaporator is connected to the suction end of the refrigeration compressor, the discharge end of the refrigeration compressor is connected to one end of the refrigerant side of the water source heat pump condenser, the other end of the refrigerant side of the water source heat pump condenser is connected to one end of the expansion valve, and the other end of the expansion valve is connected to the other end of the refrigerant side of the water source heat pump evaporator.

17. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 15 or 16, characterized in that, include: Water pump, waste hot water source input circulation pump, refrigeration compressor, water source heat pump evaporator, water source heat pump condenser and expansion valve; One end of the water pump is connected to a preheating tank (92) for pure water or softened water, and the other end of the water pump is connected to one end of the first-stage molten salt heat exchange output device (5). One end of the water side of the water source heat pump evaporator is connected to the water source of the water source heat pump via the first waste water source interface (81). The other end of the water side of the water source heat pump evaporator is connected to the water source of the water source heat pump via the second waste water source interface (82) through the waste water source input circulation pump. One end of the refrigerant side of the water source heat pump evaporator is connected to the suction end of the refrigeration compressor. The discharge end of the refrigeration compressor is connected to one end of the refrigerant side of the water source heat pump condenser. The other end of the refrigerant side of the water source heat pump condenser is connected to the other end of the refrigerant side of the water source heat pump evaporator via the expansion valve. One end of the water side of the water source heat pump condenser is connected to one end of the waste water source heating tank (86). The other end of the water side of the water source heat pump condenser is connected to the other end of the waste water source heating tank (86) via the heating circulation pump (85).

18. The molten salt thermal storage and heat exchange system for supplying heat through medium circulation according to claim 1 or 6, characterized in that, include: Molten salt heat storage tank (1), molten salt (2), molten salt heat exchange output device (5) and automobile; The molten salt (2) is disposed inside the molten salt heat storage tank (1), the molten salt heat exchange output device (5) is immersed in the molten salt (2), and the molten salt heat storage tank (1) is disposed on top of the car.

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