Molten salt heat storage and heat exchange system for supplying heat through medium circulation output

Abstract

The invention relates to the technical field of fused salt energy storage and heat supply, in particular to a fused salt heat storage and heat exchange system for supplying heat through medium circulation output. The fused salt heat storage and heat exchange system for supplying heat through medium circulation output comprises an electric heating fused salt energy storage device. The electric heating fused salt energy storage device comprises a fused salt heat storage tank, fused salt, an electric heating device and a power supply; the fused salt is stored in the fused salt heat storage tank, and the fused salt heat storage tank is provided with the electric heating device and is immersed in the fused salt in the fused salt heat storage tank. A heat exchange device of a large innovative structure is directly arranged in the fused salt heat storage tank, an energy storage and heat exchange integrated energy storage, heat exchange and fused salt pump-free circulating output heat supply system is formed, and a simple energy storage heat supply output independent unit system without a fused salt circulating pump and a high-temperature fused salt heat exchanger is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of molten salt energy storage heating, and particularly to a molten salt heat storage and heat exchange system for outputting heat through medium circulation. Background Art

[0002] The applicant applied to the State Intellectual Property Office in 2021 for "a photovoltaic energy storage power station" with the application number: 202110517433.4. For the molten salt energy storage and heat exchange energy application output, both are output through the circulation of a molten salt pump for heat exchange, and the molten salt output heat exchange is composed of a heat exchange coil type heat exchanger. In addition to the small heat exchange capacity, the heat exchange coil type heat exchanger cannot be disassembled, repaired, or replaced. Especially for the utilization of molten salt energy storage to convert steam, it is difficult to apply the heat exchange coil type heat exchanger in large-scale molten salt energy storage. Especially in large-scale energy storage heating application places such as energy storage peak shaving and valley filling in thermal power plants, surplus power energy storage and consumption in wind and solar power farms, and grid user-side valley power energy storage to balance the stable operation of power generation and supply, etc., there are great bottlenecks. At present, molten salt energy storage has developed rapidly. In the existing technology for large-scale molten salt energy storage heating applications, most use electricity, steam, gas, fuel, and high-temperature waste heat to heat solid molten salt into liquid molten salt. Since a large amount of heat is stored during the phase change of molten salt to liquid, and its thermal energy is stored in a heat preservation tank or heat preservation trough, then the high-temperature liquid molten salt is circulated and output to the primary side of a high-temperature molten salt heat exchanger by a molten salt pump, and exchanges heat with the secondary side heat transfer oil to output high-temperature heat, or exchanges heat with the secondary side water to output steam or hot water for heating. The molten salt circulation and heat exchange output are inseparable from the high-temperature circulation of the molten salt pump. However, high-temperature molten salt pumps are expensive, consume a large amount of energy, and are easily damaged. Especially for molten salt energy storage as the user-side energy storage of the power system, configuring a high-temperature molten salt pump for user applications not only brings certain inconveniences, increases the investment of the system, but also increases the complexity and maintenance volume of the system, as well as the heat loss during the molten salt circulation process. The existing molten salt storage tank is equipped with a serpentine heat exchange coil, which can only be applied to small-scale molten salt energy storage heat exchange devices and cannot be applied to large-scale energy storage systems, seriously affecting the innovative applications in thermal power plants and large-scale industrial energy storage heat exchange output heating systems. Summary of the Invention

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

[0004] The present invention provides a molten salt heat storage and heat exchange system for outputting 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 heat storage tank 1, molten salt 2, an electrothermal device 3, and a power supply 4;

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

[0007] Preferably, it further 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 partition 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-shaped tube 65 is composed of at least one group or multiple groups of U-shaped 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 and the medium outlet 67 of the heat exchange U-shaped tube 65 are partitioned and isolated by the heat exchange tube inlet and outlet medium partition plate 61.

[0012] Preferably, it includes: a molten salt storage tank 1, a 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 storage tank 1. The electric heating device 3 is arranged in the molten salt storage tank 1 and is immersed in the molten salt 2. The molten salt heat exchange output device 5 is arranged in the molten salt storage tank 1 and is immersed in the molten salt 2;

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

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

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

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

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

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

[0020] The external replacement heat exchanger 45 of the molten salt storage tank is arranged outside the molten salt storage tank 1 and is in close contact or welded connection with 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, electromagnetic induction coil terminal 49, electromagnetic induction coil terminal 50, electromagnetic induction generator terminal 51, electromagnetic induction generator terminal 52, electromagnetic induction generator 53 and power supply 54;

[0022] The high-temperature resistant heat insulation material 47 is closely wound and wrapped outside the molten salt heat storage tank 1, the electromagnetic induction coil 48 is wound outside the high-temperature resistant heat insulation material 47, and the electromagnetic induction coil terminal 49 and the electromagnetic induction coil terminal 50 are connected to the electromagnetic induction generator terminal 51 and the electromagnetic induction generator terminal 52;

[0023] The electromagnetic induction generator 53 generates high-frequency current, which is supplied to the electromagnetic induction coil 48 through the electromagnetic induction generator terminal 51 and the electromagnetic induction generator terminal 52, and through the electromagnetic induction coil terminal 49 and the electromagnetic induction coil terminal 50.

[0024] Preferably, it includes: external water jacket heat exchanger 55, external water jacket heat exchanger interface 56, external water jacket heat exchanger interface 57 and external water jacket heat exchanger water channel 58;

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

[0026] 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, water pump 15, water interface 16 and 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: water tank 24, water 25, gas-water mixer 26 and 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 is filled with the water 25, and the gas-water mixer 26 is disposed within the water 25.

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

[0032] One end of the heating and heat supply circulation pump 30 is connected to one end of the radiator and / or floor coil 31 and / or the fan coil 32 and / or the hot water outlet 33, the other end of the heating and heat supply 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 floor coil 31 and / or the fan coil 32 and / or the hot water outlet 33 and the gas-water mixer 38;

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

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

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

[0036] Preferably, it includes: a molten salt heat exchange output device 5, a water pump 15, a water interface 16, and a 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: a molten salt heat exchange output device 5, a water pump 15, a water interface 16, and a 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: a molten salt heat exchange output device 5, a steam outlet 18, an external heat exchanger 45 for the molten salt storage tank, a water pump 71, and a pure water or softened water interface 70;

[0041] One end of the water pump 71 is connected to one end of the external heat exchanger 45 for the molten salt storage tank, 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 for 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 45 for the molten salt storage tank, a pure water or softened water interface 70, and a water pump 71;

[0043] One end of the water pump 71 is connected to one end of the external heat exchanger 45 for the molten salt storage tank, the other end of the water pump 71 is connected to the pure water or softened water interface 70 described above, the other end of the external heat exchanger 45 for 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, and 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 waste heat source interface 81, a waste heat source interface 82, a waste heat source input circulation pump 83, a heating circulation pump 85, a waste heat 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 water tank 92, and a pure water or softened water input interface 93;

[0045] One end of the primary side of the waste heat source heating heat exchanger 106 is connected to the water source heat pump water source through the waste heat source interface 81, the other end of the primary side of the waste heat 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 heat source input circulation pump 83, and the other end of the waste heat source input circulation pump 83 is connected to the water source heat pump water source through the waste heat source interface 82;

[0046] One end of the secondary side of the waste heat source heating heat exchanger 106 is respectively 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 water tank 92. 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 water tank 92. The other end of the heating circulation pump 85 is connected to the other end of the secondary side of the waste heat source heating heat exchanger 106;

[0047] One end of the refrigerant side of the water source heat pump evaporator 87 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 refrigerant side of the water source heat pump condenser 89. The other end of the refrigerant side of the water source heat pump condenser 89 is connected to one end of the expansion valve 90. The other end of the expansion valve 90 is connected to the other end of the refrigerant side of the water source heat pump evaporator 87.

[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 pure water or softened water preheating water tank 92, 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 heat pump water source through the waste heat source interface 81. The other end of the water side of the water source heat pump evaporator 103 is connected to the water source heat pump water source through the waste heat source input circulation pump 100 and the waste heat source interface 82. 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 through 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 heat 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 heat source heating tank 86 through 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 an automobile 81;

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

[0053] Advantageous effects:

[0054] A heat exchange device with a large innovative structure is directly disposed inside the molten salt thermal energy storage tank, forming an integrated energy storage and heat exchange system for energy storage, heat exchange, and heat supply output without a molten salt pump circulation, realizing a simple energy storage heat supply output independent unit system without a molten salt circulation pump and a high-temperature molten salt heat exchanger. Such a simple energy storage heat exchange output heat supply independent unit system without a molten salt circulation pump and a high-temperature molten salt heat exchanger can not only be applied in thermal power plants to achieve stable, simple, low-cost, and real-time peak shaving and valley filling operations, avoiding frequent adjustments of boilers, steam turbines, and generators, storing excess electric energy in the form of electric energy storage heat, and using the stored heat to generate steam or directly output heat for heating during peak electricity consumption periods to ensure stable and safe operation of power generation without being affected by the peak and valley impacts of the power grid. It can also be used as an energy storage heat supply application for valley electricity storage on the user side of the power grid, avoiding the problem of difficult adjustment of boiler steam output during peak shaving and valley filling in thermal power plants, ensuring stable and efficient power generation in thermal power plants and balancing the power generation and supply system of the power grid. If a large number of thermal power plants and energy storage heat supply systems for valley electricity storage on the user side of the power grid are configured, peak shaving and valley filling can be achieved at low cost and high efficiency, balancing the stable operation of the power generation and supply system. It can improve the operation efficiency of wind and solar power generation, thermal power generation, and power supply, accommodate valley electricity for the majority of power grid users, improve the operation efficiency of enterprises, benefit the people with cheap living, and enhance the coordinated development of the overall social economy, having certain practical value. Description of the drawings

[0055] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0056] Appendix Figure 1 , which is a schematic diagram of an embodiment of the electric heating tube heating molten salt energy storage device of the present invention.

[0057] Appendix Figure 2 , which is a schematic structural diagram of an embodiment of the medium circulation output molten salt energy storage heat exchange device of the present invention.

[0058] Appendix Figure 3 , which is a schematic diagram of an embodiment of the three-phase power supply electric heating tube heating molten salt thermal energy storage heat exchange cycle output heat supply device of the present invention.

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

[0060] Appendix Figure 5 , is a schematic diagram of an embodiment of the heat supply device for the steam heating molten salt for heat storage, without a molten salt pump for heat exchange and circulation output.

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

[0062] Appendix Figure 7 , is a schematic diagram of an embodiment of the heat supply for the external heat exchange coil of the molten salt heat storage tank, without a molten salt pump for heat exchange and circulation output.

[0063] Appendix Figure 8 , is a schematic diagram of an embodiment of the heat supply device for the electromagnetic induction heating molten salt for heat storage, without a molten salt pump for heat exchange and circulation output.

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

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

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

[0067] Appendix Figure 12 , is a schematic diagram of an embodiment of the hot water boiler heating and heat supply system for the three-phase power supply electric heating tube to heat molten salt for heat storage, without a molten salt pump for heat exchange and circulation.

[0068] Appendix Figure 13 , is a schematic diagram of an embodiment of the heating and heat supply device for the external heat exchange coil for the three-phase power supply electric heating tube to heat molten salt for heat storage, without a molten salt pump for heat exchange and circulation.

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

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

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

[0072] Attached Figure 17 , which is a schematic diagram of an embodiment of the first-stage molten salt heat storage preheating wet steam and the second-stage molten salt dry steam generation system for heating an electric heating tube of a three-phase power supply of the present invention.

[0073] Attached Figure 18 , which is a schematic diagram of an embodiment of a steam generation device for preheating an electromagnetic induction heating with an adjustable water source heat pump outlet water temperature of the present invention.

[0074] Attached Figure 19 , which is a schematic diagram of an embodiment of a steam generation device for preheating an electromagnetic induction heating by adjusting the water source heat pump outlet water temperature of the present invention using a water source heat pump.

[0075] Attached Figure 20 , which is a schematic diagram of an embodiment of a heat supply vehicle-mounted mobile energy storage heat supply with a three-phase power supply electric heating tube heating molten salt heat storage, heat exchange cycle output without a molten salt pump of the present invention.

[0076] Description of the reference numerals:

[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 and outlet interface, 28. Safety valve, 29. Exhaust pipe, 30. Heating and heat supply circulation pump, 31. Radiator, 32. Fan coil unit, 33. Hot water outlet, 34. Tap water interface, 35. Expansion tank, 36. Water, 37. Float valve, 38. Gas-liquid mixer, 39. Make-up water interface, 40. Valve, 41. Safety valve, 42. Exhaust pipe, 43. Heat exchanger interface, 44. Heat exchanger interface, 45. External heat exchanger, 46. Check valve, 47. Thermal insulation layer for the distance between the electromagnetic induction coil and the molten salt heat storage tank, 48. Electromagnetic induction coil, 49. Electromagnetic induction coil terminal, 50. Electromagnetic induction coil terminal, 51. Electromagnetic induction generator terminal, 52. Electromagnetic induction generator terminal, 53. Electromagnetic induction generator, 54. Electromagnetic induction generator power supply, 55. External water jacket heat exchanger, 56. External water jacket heat exchanger interface, 57. External water jacket heat exchanger interface, 58. External water jacket heat exchanger water channel, 59. Heat exchange tube fixing plate, 60. Heat exchange tube expansion and / or welding interface, 61. Heat exchange tube inlet and outlet medium partition plate, 62. Heat exchange tube inlet and outlet medium sealing cap, 63. Heat exchange tube fixing plate flange, 64. Heat exchange tube fixing device, 65. Heat exchange U-tube, 66. Medium inlet, 67. Medium outlet, 68. Thermal insulation material, 69. Automobile, 70. Softened water or pure water interface, 71. Water pump, 72. Check valve, 73. Check valve, 74. Check valve, 75. Safety valve, 76. Exhaust pipe, 77. Valve, 78. Steam output interface, 79. Safety valve, 80. Exhaust pipe, 81. Surplus heat source interface, 82. Surplus heat source interface, 83. Surplus heat source input circulation pump, 84. Surplus heat source valve, 85. Heating circulation pump, 86. Surplus heat 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 water 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. Surplus heat source input circulation pump, 101. Surplus heat source valve, 102. Refrigeration compressor, 103. Water source heat pump evaporator, 104. Water source heat pump condenser, 105. Expansion valve106. Heat exchanger Detailed implementation manners

[0078] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the protection scope of the present invention.

[0079] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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, and thus cannot be understood as a limitation of the present invention.

[0080] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] Appendix Figure 1 is a schematic diagram of an embodiment of the electric heating tube heating molten salt energy storage device of the present invention. Appendix Figure 1 In it, an electric heating molten salt energy storage device is composed of a molten salt heat storage tank 1, molten salt 2, an electric heating device 3, and a power supply 4. Appendix Figure 1 In it, the molten salt 2 is arranged in the molten salt heat storage tank 1, and the electric heating device 3 is immersed in the molten salt 2 and is provided with a three-phase AC power supply by the power supply 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 is higher than the freezing point temperature of the molten salt 2, the solid molten salt 2 changes phase into the liquid molten salt 2, and a large amount of heat is stored in the molten salt during the phase change process, completing the process of converting electrical energy into thermal energy, and storing a large amount of electrical energy in the form of heat in the molten salt heat storage tank 1, realizing molten salt electrothermal energy storage.

[0082] The advantages of molten salt electro-thermal energy storage are large energy storage capacity, high safety, and strong controllability. It changes from solid to liquid, and remains at atmospheric pressure even at a high temperature of 600 °C, with excellent fluidity.

[0083] Appendix Figure 2 , which is a schematic structural diagram of an embodiment of the molten salt heat exchange output device of the present invention. Appendix Figure 2 In it, the molten salt heat exchange output device 5 is composed of a molten salt heat exchange output device 5, a heat exchange tube fixing plate 59, a heat exchange tube expansion and / or welding interface 60, a heat exchange tube inlet and outlet medium partition 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 is at least composed of one or more groups of heat exchange U-shaped tube bundles, and is fixedly connected to the heat exchange tube expansion and / or welding interface 60 through the heat exchange tube fixing plate 59. The heat exchange U-shaped tube 65 medium inlet 66 and the medium outlet 67 are separated and isolated by the heat exchange tube inlet and outlet medium partition plate 61. The heat exchange U-shaped tube 65 tube bundle group is reinforced and fixed by the heat exchange tube fixing device 64. In a large molten salt heat exchange output device 5, the heat exchange tube fixing device 64 and the auxiliary support are used to jointly fix the molten salt heat exchange output device 5 to enhance the impact resistance and stable and reliable operation of the super-large molten salt heat exchange output device 5.

[0085] The molten salt heat exchange output device 5 can also be installed horizontally in 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 installation of the molten salt heat exchange output device 5 according to their uses.

[0086] The liquid molten salt 2 in contact with the surface of the heat exchange tube bundle group through the molten salt heat exchange output device 5 exchanges heat with the medium flowing in the heat exchange tube bundle group. The medium can be heat transfer oil, water, pure water, softened water, or steam. It 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 output from the medium outlet 67 as superheated heat transfer oil, superheated water, saturated steam, or superheated steam for heat supply applications. This process eliminates the complex and expensive circulating output system and heat loss and waste such as high-temperature molten salt circulation pumps, high-temperature molten salt circulation pipelines, and high-temperature molten salt heat exchangers, and has great significance for energy conservation and emission reduction.

[0087] Appendix Figure 3 , which is a schematic diagram of an embodiment of the three-phase power electro-thermal tube heating molten salt energy storage heat exchange device of the present invention. Appendix Figure 1In it, a molten salt heat storage and heat exchange output device powered by three-phase power is composed of 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 molten salt heat exchange output device interface 6, and a molten salt heat exchange output device interface 7. The molten salt heat storage tank 1 is made of high-temperature and corrosion-resistant metal materials, and a heat insulation material 68 is arranged outside the tank body of the molten salt heat storage tank 1, and a water-like and pollution-proof protective layer is arranged outside the heat insulation material.

[0088] Figure 3 In it, the electric heating device 3 is composed of electric heating tubes and is connected to a three-phase power supply system. When the three-phase power supply 4 supplies power to the electric heating device 3, the electric heating tubes generate high-temperature heat to heat the solid molten salt 2. Since the electric heating device 3 is immersed in the solid molten salt 2, the solid molten salt 2 is heated by contacting the surface of the electric heating device 3. Because the molten salt 2 has very good thermal conductivity, its fluidity and thermal resistance are extremely low. When the solid molten salt 2 is heated and its temperature rises to a certain temperature, it begins to change from solid molten salt to liquid molten salt 2. In this process, a large amount of electric energy is converted into heat and stored in the liquid molten salt 2. The liquid molten salt 2 has excellent energy storage effects, and the pressure is basically normal pressure, and its fluidity and thermal conductivity are very excellent.

[0089] Appendix Figure 3 , it can be applied in power plants for peak shaving and valley filling. By storing excess electric energy in the form of heat, the power generation and power supply balance can be adjusted, making the peak shaving and valley filling system of the power plant simple, easy to operate, safe and reliable, and without the need for large-scale investment, thus realizing the energy storage peak shaving and valley filling system of thermal power plants. After the surplus power energy storage is completed, heat exchange is carried out between the molten salt heat exchange output device 5 and the liquid molten salt 2, and the molten salt heat is output directly for heat energy utilization through the molten salt heat exchange output device interface 6 and the molten salt heat exchange output device interface 7 to connect to the peripheral steam or hot water or heat transfer oil. Adding clean water can output hot water, adding pure water or softened water can output steam, and adding heat transfer oil can output high-temperature and low-pressure heat for cyclic output application. The specific application scenario is composed of a heating and heat supply or industrial high-temperature heat application system that completes energy storage, heat exchange, and molten salt pump-free cyclic output utilization through the peripheral hot water or steam or heat transfer oil pipeline and the auxiliary equipment system. Since the peripheral hot water or steam or heat transfer oil pipeline and the auxiliary equipment system are not within the scope of the technical scope of the present invention, no detailed introduction is made.

[0090] In the appendix Figure 3 , electric energy is converted into heat energy through the electric heating device 3 and stored in the tank body of the molten salt heat storage tank body 1. Then, through the molten salt heat exchange output device 5, the stored molten salt heat is heat-exchanged according to its application purpose, and directly output to any place that needs heat by using the peripheral equipment of the system used, without the need for a complex system application of circulating the high-temperature liquid molten salt through a high-temperature molten salt pump to a high-temperature solution heat exchanger. The medium circulating through the molten salt heat exchange device 5 in the molten salt storage tank directly exchanges heat with the high-temperature liquid molten salt 2 to output the heat converted and stored by the electric energy in the molten salt heat storage tank 1. Appendix Figure 3The energy storage system outputs through the molten salt heat exchange device 5's medium circulation, simply, easily, and perfectly achieving the purposes of energy storage, heat exchange, and heat output. It saves a large amount of one-time investment for the molten salt energy storage system and also reduces the heat loss of the molten salt pump circulation pipeline system.

[0091] Appendix Figure 3 In it, the molten salt 2 can be a binary molten salt, a ternary molten salt, or a liquid metal. According to its capacity, the electric heating device 3 is configured with a flange-type electric heating tube group assembly device, which is connected to the molten salt storage tank flange of the molten salt storage tank body 1, facilitating the disassembly and maintenance of the electric heating tube device.

[0092] The electric heating device 3 can also be horizontally installed according to the usage situation, and is installed horizontally according to the user's usage scenario.

[0093] The molten salt heat exchange output device 5 in the molten salt storage tank 1 is connected to the molten salt storage tank flange of the molten salt storage tank 1 through a flange, facilitating hoisting, disassembly, inspection, replacement, and maintenance, ensuring the safe operation of molten salt energy storage, heat exchange, and heat output. The molten salt heat exchange output device 5 is at least composed of one group or multiple groups of molten salt heat exchange output devices 5 to form a molten salt storage heat exchange system for medium circulation output and heat supply.

[0094] Appendix Figure 4 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 the present invention. Appendix Figure 4 It only differs from Appendix Figure 3 in that the power supply form of the power supply 4 is different. Appendix Figure 4 is the wiring method of supplying single-phase power to the electric heating tubes of the electric heating device 3, suitable for families with single-phase electricity, using the single-phase power supply connection method, while Appendix Figure 3 is suitable for three-phase electricity industrial application scenarios. Appendix Figure 4 is suitable for places with only single-phase electricity and no three-phase electricity. If three-phase electricity is available, Appendix Figure 3 the energy storage heat exchange device should be given priority.

[0095] Appendix Figure 5 is a schematic diagram of an embodiment of the steam heating molten salt energy storage heat exchange device of the present invention. Appendix Figure 5 The difference from Appendix Figure 3 is that the steam heating heat exchanger 8 replaces the electric heating device 3 and the power supply 4. It can use steam, industrial waste heat steam, or high-temperature saturated steam hot water to deliver waste heat to the steam heating heat exchanger 8 to heat the solid molten salt 2, and other heating processes are the same as Appendix Figure 3The same. Waste heat steam or high-temperature saturated steam hot water circulates in and out through the steam heating heat exchanger interfaces 9 and 10. Steam or high-temperature saturated hot water cannot be used to heat the molten salt below the freezing point temperature of the molten salt 2, which will affect the overall efficiency. Therefore, its losses and efficiency should be considered during application. The freezing point temperature of common binary molten salts is about 220°C, that of ternary molten salts is about 140°C, and that of lithium nitrate mixed salts is about 120°C. Waste heat steam or high-temperature saturated hot water below the above freezing point temperature cannot be used to heat the molten salt.

[0096] Appendix Figure 6 , is a schematic diagram of an embodiment of the heat supply device with heat exchange cycle output without a molten salt pump for high-temperature waste heat flue gas or flame heating molten salt energy storage of the present invention. Appendix Figure 5 It is to immerse and configure the flue gas or flame heat exchange tube 11 in the molten salt 2 to form the utilization of high-temperature flue gas or flame waste heat energy storage heat exchange output.

[0097] The flue gas or flame 14 can be the high-temperature flue gas of an industrial boiler or the waste heat of the discharged flame from the combustion in a chemical or refinery. The flue gas or flame enters through the pipeline connection to the flue gas or flame inlet 12. The high-temperature flue gas or flame entering through the interface 12 passes through the flue gas or flame heat exchange tube 11. The waste heat high-temperature flue gas or flame 14 heats the molten salt 2 through the outer wall of the flue gas or flame heat exchange tube 11 immersed in the molten salt 2, and the supercooled flue gas or flame 14 is discharged through the flue gas or flame outlet 13. Others are the same as Appendix Figure 1 The same.

[0098] Appendix Figure 7 , is a schematic diagram of an embodiment of the heat supply with heat exchange cycle output without a molten salt pump for the external heat exchange coil of the molten salt energy storage tank of the present invention. Appendix Figure 7 In, the external energy storage heat exchange output device of the molten salt energy storage tank 1 is composed of the heat exchanger interface 43, the heat exchanger interface 44 and the external heat exchanger 45. The external heat exchanger 45 should be configured in good contact with the outer surface of the molten salt energy storage tank 1 to enhance the heat exchange effect between the external heat exchanger 45 and the tank body of the molten salt energy storage tank 1. Preferably, it is a welding connection method with zero thermal resistance. Or a outer barrel tank body is sleeved outside the tank body of the molten salt energy storage tank 1, and a medium channel circulation flow heat exchange gap is formed between the two tank bodies. The heat of the high-temperature liquid molten salt in the tank body of the molten salt energy storage tank 1 is exchanged through the medium with the surface of the tank body of the molten salt energy storage tank 1. The medium in the heat exchange gap is connected to the heating and heat supply system medium output through the heat exchanger interface 43 and the heat exchanger interface 44 to utilize the stored heat.

[0099] Appendix Figure 7 The structure is simple and is more suitable for the application of household small-scale valley electricity energy storage heating and heat supply. The three-phase power supply is beneficial to cooperate with the three-phase power balance. If there is no three-phase power supply, a single-phase power supply can also be used, but the current of the single-phase power operation is larger than that of the three-phase power, especially the starting current.

[0100] AppendixFigure 8 , which is a schematic diagram of an embodiment of the heat exchange cycle output heating device of the electromagnetic induction heating molten salt heat storage without a molten salt pump of the present invention. Attached Figure 8 Although the heating form also uses electric heating, it does not use an electric heating tube heating device, but uses the principle of electromagnetic induction to heat. When an alternating current flows through the electromagnetic induction coil 48, an alternating magnetic field will be generated around the electromagnetic induction coil 48. The alternating magnetic field will generate eddy current inside the metal tank body of the molten salt heat storage tank 1. When the eddy current flows inside the metal tank body of the molten salt heat storage tank 1, due to the existence of resistance inside the metal tank body of the molten salt heat storage tank 1, according to the Joule heat effect, heat is generated by the friction between the flowing eddy current and the resistance inside the metal tank of the molten salt heat storage tank 1, thus realizing the conversion of electrical energy into heat energy. Its advantages are high thermal efficiency, fast heating, small loss, and non-contact heating. Therefore, it has a longer service life than the electric heating tube type. The molten salt heat storage tank 1 should be made of a metal material similar to cast iron, which has a higher electromagnetic induction thermal efficiency. It can also be made of 430 series iron-containing stainless steel with high electromagnetic induction heating efficiency to enhance the corrosion of molten salt on the metal material.

[0101] The power supply 54 of the electromagnetic induction generator inputs three-phase alternating current into the electromagnetic induction generator 53 and rectifies it into direct current. By controlling the frequency of the high-frequency oscillator, the direct current is inverted to generate a high-frequency alternating current of 20 - 50Khz, which flows through the electromagnetic induction coil 48 through the electromagnetic induction generator terminal 51 and the electromagnetic induction generator terminal 52, the electromagnetic induction coil terminal 49 and the electromagnetic induction coil terminal 50, generating a high-frequency alternating magnetic field, completing the electromagnetic induction heating of the molten salt heat storage tank 1 body, and then directly heating the molten salt 2 by the molten salt heat storage tank 1 body, realizing the conversion of electrical energy into heat energy and energy storage, and then outputting the stored molten salt heat through the molten salt heat exchange device 5 for application.

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

[0103] Attached Figure 9 , which is a schematic diagram of an embodiment of the heat exchange and heating device for heating and supplying heat without a molten salt pump with an external water jacket for electromagnetic induction heating of the present invention. Attached Figure 9 An external water jacket heat exchanger 55 is configured. A water channel 58 of the external water jacket heat exchanger is formed by welding between the external water jacket heat exchanger 55 and the molten salt heat storage tank 1. The medium in the water channel 58 of the external water jacket heat exchanger exchanges heat with the molten salt heat storage tank 1. If the unit is for heating and supplying hot water, it enters from the 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 external water jacket heat exchanger interface 57 for circulation output to complete heating and supplying heat for heating.

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

[0105] The water channel 58 of the external water jacket heat exchanger can also be welded with partitions to divide the overall water channel 58 of the external water jacket heat exchanger into a spiral water channel, which is a spiral water channel circulation heat exchange water channel similar to that of a pipe coil heat exchanger, improving heat exchange. The medium in the water channel 58 of the external water jacket heat exchanger can be water, or steam can be generated, or it can also be a heat-conducting oil circulating to output heat.

[0106] Appendix Figure 10 , is a schematic diagram of an embodiment of the steam boiler steam supply system for the molten salt heat storage of the three-phase power electrothermal tube heating without a molten salt pump heat exchange cycle of the present invention. Appendix Figure 10 Softened water or pure water is pumped into the water inlet 16 by the water pump 15. The high-pressure water circulation generated by the water pump 15 passes through the check valve 17 and enters the molten salt heat exchange device 5 through the molten salt heat exchange device interface 6, is heated by the high-temperature molten salt to generate steam, and the steam flow is adjusted by the valve 19 through the molten salt heat exchange device interface 7, and the steam is output from the steam outlet 18. The safety valve 20 is a safety configuration for protecting the steam system. Once the steam pressure exceeds the safety set value, the safety valve 20 opens, and the overpressure steam is discharged to the atmosphere through the exhaust pipe 21 to ensure the safe operation of the water and steam system.

[0107] The check valve 17 is a one-way valve that can only flow out and cannot flow back in the reverse direction, ensuring that the water pump 15 sends softened water or pure water into the molten salt heat exchange output device 5 and will not flow back from the molten salt heat exchange output device 5 to the water pump 15 in the reverse direction. The water pump 15 is a high-pressure multi-stage water pump selected according to the steam pressure.

[0108] Appendix Figure 10 , is the most basic electro-thermal energy storage type steam generator, which can be combined with Appendix Figure 3 , Appendix Figure 4 , Appendix Figure 5 , Appendix Figure 6 and Appendix Figure 7 to form large-scale various waste heat storage type steam boilers. Appendix Figure 10 Utilize off-peak electricity at night to replace coal-fired, oil-fired, and gas-fired boilers, or directly adopt wind-solar green electric energy and cooperate with off-peak electricity supply of the power grid, as well as the application of waste heat and waste heat environmental protection energy storage.

[0109] Appendix Figure 11 , is a schematic diagram of an embodiment of the steam boiler steam supply system for the molten salt heat storage of the three-phase power electrothermal tube heating without a molten salt pump heat exchange cycle and steam and condensate water recovery of the present invention. Appendix Figure 11 is in Appendix Figure 10Based 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 and outlet interface 27, a safety valve 28 and an exhaust pipe 29 are configured to form a pressure relief steam and residual steam recovery device. When the steam stops outputting and the water pump 15 stops supplying water, since the high-temperature molten salt continues to heat the molten salt heat exchange output device 5, the steam pressure inside the pipe of the molten salt heat exchange output device 5 continues to rise. Under normal circumstances, the safety protection is achieved by opening the safety valve 20, and the overpressure steam is discharged to the atmosphere system through the exhaust pipe 21 for pressure relief protection. However, a large amount of steam is wasted by being discharged and discarded. By setting the pressure value of the pressure sensor to be lower than the working pressure of the safety valve 20 before it opens, the electromagnetic or electric valve 22 is opened in advance, and the electromagnetic or electric valve 22 is automatically controlled to open in advance. The steam is introduced into the gas-water mixer 26 through the check valve 23, and is released into the water 25 in the water tank 24 through the gas-water mixer 26 without water bubbles and low noise to be mixed into water. The gas-water mixer 26 is used to eliminate the water explosion noise, recover the waste heat of the steam, and achieve silent operation.

[0110] Appendix Figure 12 , which is a schematic diagram of an embodiment of the heating and heat supply system of a three-phase power electrothermal tube heating molten salt thermal energy storage hot water boiler without a molten salt pump for heat exchange. Appendix Figure 12 is based on Appendix Figure 10 On this basis, a heating and heat supply circulation pump 30, radiators 31, fan coil units 32, a hot water outlet 33, a tap water interface 34, an expansion tank 35, water 36, a float valve 37, a gas-liquid mixer 38, a make-up water interface 39, valves 40, a safety valve 41 and an exhaust pipe 42 are configured to form an electric energy storage hot water heating and heat supply application example.

[0111] During wind and solar power generation, or during the off-peak period of the power grid at night, electric energy is used to heat the molten salt for energy storage, and the heat is stored in the molten salt thermal energy storage tank 1. The heating water in the radiators 31 and / or fan coil units 32 and / or hot water outlet 33 is circulated through the heating and heat supply circulation pump 30. The heating water heated by the molten salt through the molten salt heat exchange output device 5 is circulated through the molten salt heat exchange output device interface 6 from the molten salt heat exchange output device interface 7, and then circulates into the radiators 31 and / or fan coil units 32 and / or hot water outlet 33, and the hot water heat is released to the heating room through the radiators 31 and / or fan coil units 32 to heat the room air, realizing heating operation. It is also possible to output hot water through the hot water outlet 33, or a single application of independently configuring the hot water outlet 33 to output hot water.

[0112] The expansion tank 35 plays a role in the safe operation of the heating and heat supply system. Once the system pressure rises, it is relieved through the gas-liquid mixer 38 into the water 36. Tap water is introduced through the make-up water interface 39 and supplied to the expansion tank 35 through the valve 40 and the float valve 37. The safety valve 41 and the exhaust pipe 42 play a role in safety protection.

[0113] Appendix Figure 13, is a schematic diagram of an embodiment of the heating and heat supply device of the external heat exchange coil for the molten salt heat storage of the three-phase power supply electric heating tube of the present invention without a molten salt pump heat exchange cycle. Attached Figure 13 is configured with a heating and heat supply circulation pump 30, radiators 31, fan coils 32, a hot water outlet 33, a tap water interface 34, an expansion tank 35, water 36, a float valve 37, a gas-liquid mixer 38, a make-up water interface 39, valves 40, a safety valve 41, and an exhaust pipe 42 on the basis of Figure 7 to form an electric energy storage hot water heating and heat supply application example. Its operation process is that the external heat exchanger 45 exchanges heat with the molten salt 2 in the molten salt heat storage tank 1, and circulates heating and heat supply through the check valve 46 by the heating and heat supply circulation pump 30 through the heat exchanger interface 43 and the heat exchanger interface 44. Its heating and heat supply process is the same as that of Figure 12 and will not be described again. The safety valve 41 and the exhaust pipe 42 play a safety protection role.

[0114] Attached Figure 14 , is a schematic diagram of an embodiment of the hot water heating and heat supply and steam supply device with internal and external heat exchange of molten salt heated by a three-phase power supply electric heating tube of the present invention. Attached Figure 14 is configured with a molten salt heat exchange output device 5 on the basis of Figure 13 to generate steam or high-temperature hot water through the molten salt heat exchange output device 5, and use the external heat exchanger 45 for low-temperature water heating and heat supply. With a dual operation mode, while producing steam, it can also operate for heating and heat supply, expanding the application range. Its operation process is the same as that of Figure 13 , and Figure 12 and will not be described again.

[0115] Attached Figure 15 , is a schematic diagram of an embodiment of the electromagnetic induction heating molten salt heat storage without a molten salt pump heat exchange cycle output steam system of the present invention. Attached Figure 15 is configured with a molten salt heat exchange output device 5 on the basis of Figure 8 to form a large-scale electromagnetic induction heating energy storage heat exchange output steam system, or an electromagnetic induction large steam boiler by generating steam or high-temperature hot water through the molten salt heat exchange output device 5. Its working process is the same as that of Figure 8 and 10 and will not be repeated.

[0116] Attached Figure 16 , is a schematic diagram of an embodiment of the external heat exchange pre-heated water steam generating device for molten salt heated by a three-phase power supply electric heating tube of the present invention. Attached Figure 16 is on the basis of Figure 14On the basis of removing the heating and heat supply system, the external heat exchanger 45 is used as the preheating heat exchanger of the steam boiler to heat and preheat the softened water or pure water input to the molten salt heat exchange output device 5. The softened water or pure water enters through the water interface 70, passes through the water pump 71, through the check valve 74, and enters through the heat exchanger interface 43. First, it exchanges heat with the high-temperature liquid molten salt 2 in the molten salt heat storage tank 1 through the external heat exchanger 45, heats it to the required preheated water temperature, and is output through the heat exchanger interface 44. Then it enters the molten salt heat exchange output device 5 through the check valve 73 and continues to be heated to steam at high temperature. The steam flow is regulated by the valve 19 and the steam is output through the steam outlet 18. The safety valve 20 and the exhaust pipe 21 constitute a safety operation protection device.

[0117] Appendix Figure 17 , Schematic diagram of the embodiment of the first-stage molten salt heat storage heating wet steam and second-stage molten salt dry steam generation system of the three-phase power electric heating tube of the present invention. Appendix Figure 17 , is to add a stage of molten salt heat storage heating device on the basis of Appendix Figure 16 to form a two-stage molten salt heat storage heating dry steam output system. After the softened water or pure water is preheated by the external heat exchanger 45, it enters the first-stage molten salt heat exchange output device 5 through the check valve 73 and is heated to saturated steam, or heated to steam with a certain humidity at about 350 °C, and then sent to the second-stage molten salt heat exchange output device 5 through the check valve 74 to continue heating and output to 540 °C superheated dry steam, or output 600 °C supercritical steam. When applying 600 °C supercritical power generation, the temperature of the molten salt heat 2 stored in the second-stage molten salt heat storage tank 1 should be ≥ 600 °C. The highest safe operating temperature of the binary molten salt is below 600 °C. Currently, molten salts above 600 °C need to be made of higher-standard corrosion-resistant materials. Because the fluoride molten salt has a stability of up to 800 °C or more, but the molten salt tank body metal material needs to be made of Hastelloy. The chloride molten salt has a melting point of 380 °C and a high thermal stability of up to 800 °C, but the molten salt heat storage tank 1 needs to be made of ceramics or nickel-based alloys. According to the selection of the dry steam temperature, the material of the molten salt heat storage tank 1 should be reasonably selected, and the demand for higher temperature output can also be realized.

[0118] Appendix Figure 17 In it, the check valve 72, the check valve 73, the check valve 74, the safety valve 75, the exhaust pipe 76, the safety valve 79 and the exhaust pipe 80 are all devices configured to ensure the safety of the steam system. The steam is output by the valve 77 and the steam output interface 78.

[0119] Appendix Figure 17 , It is also possible not to use the external heat exchanger 45 to preheat the pure water or softened water, but to use all types of heat storage heating devices of the present invention configured in an independent form to preheat the pure water or softened water through the heat storage heat exchange system output by the medium circulation, or use any other form of energy-saving preheating system to preheat the pure water or softened water.

[0120] Appendix Figure 18 Figure Figure 18 is a schematic diagram of an embodiment of the electromagnetic induction heating steam generating device for preheating the outlet water temperature of the adjustable water source heat pump of the present invention. Appendix Figure 18 The water source heat pump heating pure water or softened water preheating system is composed of the waste heat water source interface 81, the waste heat water source interface 82, the waste heat water source input circulation pump 83, the waste heat water source valve 84, the heating circulation pump 85, the waste heat water source heating heat exchanger 106, the water source heat pump evaporator 87, the refrigeration compressor 88, the water source heat pump condenser 89, the expansion valve 90, the water source heat pump hot water circulation pump 91, the pure water or softened water preheating water tank 92, and the pure water or softened water input interface 93.

[0121] In many scenarios with waste heat, the waste heat water source is used to configure a water source heat pump to preheat softened water or pure water energy-savingly. Especially in the oilfield production process, a large amount of oily sewage at about 30 °C is generated. Its huge waste heat sewage can be used as a high-quality waste heat resource for the water source heat pump system. Using the oily sewage water source heat pump system to heat the softened water or pure water input into the steam boiler is an ideal application for energy conservation and emission reduction.

[0122] Appendix Figure 18 In Figure Figure 18 , due to the requirement of the preheated water temperature, the output water temperature of the water source heat pump unit often cannot meet the user's needs. Therefore, an automatic adjustment system for the output water temperature of the water source heat pump unit is configured by the heating circulation pump 85 and the waste heat water source heating heat exchanger 106 in the water source heat pump unit. The water source is heated on the primary side of the waste heat water source heating heat exchanger 106, and the high-temperature hot water output by the water source heat pump unit is circulated by the heating circulation pump 85 to the secondary side of the waste heat water source heating heat exchanger 106 to heat the low-temperature water source flowing through, and the configured frequency converter is used to control the flow rate and flow velocity of the heating circulation pump 85 to control the temperature of the water source flowing through the waste heat water source interface 81, and complete the required demand for the outlet water temperature of the water source heat pump. Adjusting and raising the temperature of the water source input to the water source heat pump can play a lever role. A small increase in the input water source temperature can result in a large increase in the output water temperature of the water source heat pump unit.

[0123] Appendix Figure 19 Figure Figure 19 is a schematic diagram of an embodiment of the electric heating steam generating device for preheating by adjusting the outlet water temperature of the water source heat pump of the present invention. Appendix Figure 19 It is based on Appendix Figure 18 Figure Figure 18 is an embodiment of configuring an independent water source heat pump unit to increase the temperature of the water source input to the water source heat pump. Appendix Figure 19 In Figure Figure 19 , the heating system for increasing the temperature of the water source input to the water source heat pump by an independent water source heat pump unit is composed of the water pump 96, the check valve 97, the waste heat water source input circulation pump 100, the waste heat water source valve 101, the refrigeration compressor 102, the water source heat pump evaporator 103, the water source heat pump condenser 104, and the expansion valve 105.

[0124] Appendix Figure 19In it, the water source is heated by the waste heat water source heating tank 86, and the heating circulation pump 85 heats the hot water output from the water source heat pump condenser 104 circulated by the heating circulation pump 85. The water source flowing through the water source in the waste heat water source heating tank 86 is used to increase the output temperature of the high-temperature hot water output from the water source heat pump condenser 89 to reach the required preheated water outlet temperature. The softened water or purified water that meets the preheating requirement is sent into the first-stage molten salt heat exchange output device 5 through the water pump 96 and the check valve 97 and heated to saturated steam, and then continues to be heated by the second-stage molten salt heat exchange output device 5 and output to 540 °C superheated dry steam.

[0125] Appendix Figure 20 is a schematic diagram of an embodiment of the heat storage and heat supply of a three-phase power supply electric heating tube heating molten salt without a molten salt pump heat exchange cycle output for a vehicle-mounted mobile energy storage heat supply. Appendix Figure 20 It is to Figure 1 to Appendix Figure 8 are configured on a motor vehicle to form a mobile vehicle-mounted energy storage application scenario. For a wind-solar power generation farm that does not transmit electric energy through the power grid, the redundant electric energy is directly stored as heat for application, and for a thermal power plant to generate electricity stably, the electric heating energy storage is used to adjust the peak and fill the valley to balance the power generation and supply system. It can also transport heat energy by car to conveniently provide heat energy sales applications to users in need of heat energy.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A molten salt heat storage and heat exchange system for heat supply through medium circulation, characterized in that It includes an electrothermal molten salt energy storage device; The electrothermal molten salt energy storage device includes a molten salt heat storage tank (1), molten salt (2), an electrothermal device (3), and a power supply (4); The molten salt heat storage tank (1) stores the molten salt (2), and the molten salt heat storage tank (1) is configured with the electrothermal device (3) and is immersed in the molten salt (2) within the molten salt heat storage tank (1).

2. The molten salt heat storage and heat exchange system for heat supply output through medium circulation according to claim 1, wherein It further includes a molten salt heat exchange output device; The molten salt heat exchange output device (5) includes: a heat exchange tube fixing plate (59), a heat exchange tube expansion and / or welding interface (60), a heat exchange tube inlet and outlet medium separator (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); The heat exchange U-shaped tube (65) is composed of at least one group or multiple groups of U-shaped 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 welding interface (60); The medium inlet (66) and the medium outlet (67) of the heat exchange U-shaped tube (65) are separated and isolated by the heat exchange tube inlet and outlet medium separator (61).

3. The molten salt heat storage heat exchange system for heat supply output through medium circulation according to claim 1 or 2, characterized in that, It includes: A molten salt heat storage tank (1), molten salt (2), an electrothermal device (3), a power supply (4), and a molten salt heat exchange output device (5); The molten salt (2) is stored in the molten salt heat storage tank (1), the electrothermal device (3) is configured in the molten salt heat storage tank (1) and is immersed in the molten salt (2), and the molten salt heat exchange output device (5) is configured in the molten salt heat storage tank (1) and is immersed in the molten salt (2); The power supply (4) is a three-phase power supply or a single-phase power supply.

4. The molten salt thermal energy storage heat exchange system for heat supply by means of medium circulation according to claim 1, characterized in that, 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); The steam heat exchanger (8) is configured in the molten salt heat storage tank (1) and is immersed in the molten salt (2).

5. The molten salt heat storage and heat exchange system for heat supply output through medium circulation according to claim 1, characterized in that, It includes: A molten salt heat storage tank (1), molten salt (2), a flue gas or flame heat exchange tube (11), and a flue gas or flame (14); The flue gas or flame heat exchange tube (11) is configured in the molten salt heat storage tank (1) and is immersed in the molten salt (2).

6. The molten salt heat storage and heat exchange system for heat supply through medium circulation according to claim 1, wherein It includes: A molten salt heat storage tank (1), molten salt (2), an electrothermal device (3), a power supply (4), and an external heat exchanger for the molten salt storage tank (45); The external heat exchanger for the molten salt storage tank (45) is configured outside the molten salt storage tank (1) and is in close contact with zero thermal resistance or welded to the outer surface of the molten salt heat storage tank (1).

7. The molten salt heat storage and heat exchange system for outputting heat supply through medium circulation according to claim 1, characterized in that It includes: A molten salt heat storage tank (1), molten salt (2), a molten salt heat exchange output device (5), a high-temperature heat-insulating and heat-resistant material (47), an electromagnetic induction coil (48), an electromagnetic induction coil terminal (49), an electromagnetic induction coil terminal (50), an electromagnetic induction generator terminal (51), an electromagnetic induction generator terminal (52), an electromagnetic induction generator (53), and a power supply (54); The high-temperature resistant heat insulation material (47) is closely wound and wrapped around the outside of the molten salt heat storage tank (1). The electromagnetic induction coil (48) is wound around the outside of the high-temperature resistant heat insulation material (47). The electromagnetic induction coil terminal (49) and the electromagnetic induction coil terminal (50) are connected to the electromagnetic induction generator terminal (51) and the electromagnetic induction generator terminal (52); The electromagnetic induction generator (53) generates high-frequency current, which is supplied to the electromagnetic induction coil (48) through the electromagnetic induction generator terminal (51), the electromagnetic induction generator terminal (52), the electromagnetic induction coil terminal (49), and the electromagnetic induction coil terminal (50).

8. The molten salt heat storage and heat exchange system for outputting heat supply through medium circulation according to claim 7, wherein Comprising: External water jacket heat exchanger (55), external water jacket heat exchanger interface (56), external water jacket heat exchanger interface (57), and external water jacket heat exchanger water channel (58); The external water jacket heat exchanger (55) is arranged outside the molten salt heat storage tank (1). The upper and lower ends of the external water jacket heat exchanger water channel (58) are welded and sealed with the outside of the molten salt heat storage tank (1). The medium flowing in the external water jacket heat exchanger water channel (58) is connected to the outer surface of the molten salt heat storage tank (1) for heat exchange. The external water jacket heat exchanger interface (56) and the external water jacket heat exchanger interface (57) are connected to the medium in the external water jacket heat exchanger water channel (58).

9. The molten salt heat storage and heat exchange system for heat supply by medium circulation output according to claim 3, wherein Comprising: 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 (15), water interface (16), and steam outlet (18); One end of the water pump (15) is connected to one end of the molten salt heat exchange output device (5), and the other end of the water pump (15) is connected to the water interface (16). The other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

10. The molten salt heat storage and heat exchange system for heat supply by medium circulation output according to claim 9, characterized in that, Comprising: Water tank (24), water (25), gas-water mixer (26), 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 (26); The water (25) is arranged in the water tank (24), and the gas-water mixer (26) is arranged in the water (25).

11. The molten salt heat storage and heat exchange system for heat supply output through medium circulation according to claim 3, wherein, Comprising: Molten salt heat storage tank (1), molten salt (2), electric heating device (3), power supply (4), molten salt heat exchange output device (5), heating and heat supply circulation pump (30), radiator and / or floor coil (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); One end of the heating and heat supply circulation pump (30) is connected to one end of the radiator and / or floor coil (31) and / or the fan coil unit (32) and / or the hot water outlet (33). The other end of the heating and heat supply 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 floor coil (31) and / or the fan coil unit (32) and / or the hot water outlet (33) and the air-water mixer (38). The expansion tank (35) is filled with the water (36), and the air-water mixer (38) is disposed in the water (36) in the expansion tank (35).

12. The molten salt heat storage and heat exchange system for heat supply by medium circulation according to claim 6, wherein Comprising: Heating and heat supply circulation pump (30), radiator and / or floor coil (31) and / or fan coil unit (32) and / or hot water outlet (33), air-water mixer (38), and external heat exchanger for molten salt storage tank (45). One end of the heating and heat supply circulation pump (30) is connected to one end of the external heat exchanger for molten salt storage tank (45). The other end of the radiator and / or floor coil (31) and / or the fan coil unit (32) and / or the hot water outlet (33) and the air-water mixer (38) is connected to the other end of the external heat exchanger for molten salt storage tank (45).

13. The molten salt thermal energy storage heat exchange system for heat supply through medium circulation according to claim 2 or 12, characterized in that, Comprising: Molten salt heat exchange output device (5), water pump (15), water interface (16), and steam outlet (18). 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). The other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

14. The molten salt heat storage and heat exchange system for outputting heat supply through medium circulation according to claim 7, characterized in that, Comprising: Molten salt heat exchange output device (5), water pump (15), water interface (16), and steam outlet (18). 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). The other end of the molten salt heat exchange output device (5) is connected to the steam outlet (18).

15. The molten salt thermal energy storage heat exchange system for heat supply by medium circulation according to claim 14, wherein Comprising: Molten salt heat exchange output device (5), steam outlet (18), external heat exchanger for molten salt storage tank (45), water pump (71), and pure water or softened water interface (70). The water pump (71) is connected to one end of the external heat exchanger for molten salt storage tank (45). 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 for molten salt storage tank (45) 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 steam outlet (18).

16. The molten salt heat storage and heat exchange system for heat supply through medium circulation according to claim 15, wherein Comprising: 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), external heat exchanger for molten salt storage tank (45), pure water or softened water interface (70), and water pump (71). The water pump (71) is connected to one end of the external replacement heat exchanger (45) of the molten salt storage tank. 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 replacement 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).

17. The molten salt heat storage and heat exchange system for outputting heat supply through medium circulation according to claim 14, wherein Comprising: Surplus heat source interface (81), surplus heat source interface (82), surplus heat source input circulation pump (83), heating circulation pump (85), surplus heat source heating heat exchanger (106), water source heat pump evaporator (87), refrigeration compressor (88), water source heat pump condenser (89), expansion valve (90), water source heat pump hot water circulation pump (91), pure water or softened water pre-heating water tank (92) and pure water or softened water input interface (93); One end of the primary side of the surplus heat source heating heat exchanger (106) is connected to the water source of the water source heat pump through the surplus heat source interface (81). The other end of the primary side of the surplus heat 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 surplus heat source input circulation pump (83). The other end of the surplus heat source input circulation pump (83) is connected to the water source of the water source heat pump through the surplus heat source interface (82); One end of the secondary side of the surplus heat source heating heat exchanger (106) is respectively 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 pre-heating water tank (92). 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 pre-heating water tank (92). The other end of the heating circulation pump (85) is connected to the other end of the secondary side of the surplus heat source heating heat exchanger (106); One end of the refrigerant side of the water source heat pump evaporator (87) is connected to the suction end of the refrigeration compressor (88). The exhaust end of the refrigeration compressor (88) is connected to one end of the refrigerant side of the water source heat pump condenser (89). The other end of the refrigerant side of the water source heat pump condenser (89) is connected to one end of the expansion valve (90). The other end of the expansion valve (90) is connected to the other end of the refrigerant side of the water source heat pump evaporator (87).

18. The molten salt heat storage and heat exchange system for outputting heat supply through medium circulation according to claim 16 or 17, characterized in that, Comprising: Water pump (96), surplus heat source input circulation pump (100), refrigeration compressor (102), water source heat pump evaporator (103), water source heat pump condenser (104) and expansion valve (105); One end of the water pump (96) is connected to the pure water or softened water preheating water tank (92), 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); 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 through the waste heat source interface (81), and 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 through the waste heat source input circulation pump (100) via the waste heat source interface (82). 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), and 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) through 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 heat source heating tank (86), and the other end of the water side of the water source heat pump condenser (104) is connected to the other end of the waste heat source heating tank (86) through the heating circulation pump (85).

19. The molten salt heat storage and heat exchange system for heat supply output through medium circulation according to claim 1 or 7, characterized in that, Including: Molten salt heat storage tank (1), molten salt (2), molten salt heat exchange output device (5) and vehicle (81); The molten salt (2) is configured in 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 configured on the vehicle (81).

Images