Energy supply system

Abstract

The application discloses a kind of energy supply systems, belongs to molten salt energy storage and power generation technical field.The energy supply system includes: molten salt circulation loop, including photo-thermal molten salt heating device, multiple-stage temperature molten salt storage tank connected in series and the first road of heat exchanger connected between adjacent two-stage temperature molten salt storage tank;Multiple-stage power generation circulation loop each includes: corresponding stage's reservoir, corresponding stage's pump, corresponding stage's the second road of heat exchanger, corresponding stage's turbine device, and the second road of heat exchanger is used to absorb heat from corresponding first road, the turbine device is power coupled with generator.According to the energy supply system of the application, by releasing the heat energy stored in molten salt in stages and using it for step-by-step power generation, the heat energy of each grade stored in molten salt can be more fully utilized, the energy conversion efficiency is improved, part of the power generation circulation loop can be started and stopped flexibly according to actual power demand, different power levels of electric energy can be output, and the peak shaving reliability and operation economy of power grid are enhanced.

Description

Technical Field

[0001] This application belongs to the field of molten salt energy storage and power generation technology, and particularly relates to an energy supply system. Background Technology

[0002] Molten salt can be used as an energy storage medium to achieve efficient energy storage and release. However, energy supply systems using molten salt as an energy storage medium have low energy utilization rates, limited power supply, and high energy loss rates. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes an energy supply system capable of releasing the thermal energy stored in molten salt in stages and using it for cascade power generation.

[0004] In a first aspect, this application provides an energy supply system, comprising: The molten salt circulation loop includes a photothermal molten salt heating device, a series-connected multi-stage temperature molten salt storage tank, and a first path of a heat exchanger connected between two adjacent temperature molten salt storage tanks; The multi-stage power generation cycle includes: a corresponding stage liquid storage tank, a corresponding stage pump, a second path of the corresponding stage heat exchanger, and a corresponding stage turbine device. The second path of the heat exchanger is used to absorb heat from the corresponding first path, and the turbine device is powered and coupled to a generator.

[0005] According to the energy supply system of this application, by releasing the thermal energy stored in molten salt in stages and using it for cascade power generation, the thermal energy of various grades stored in molten salt can be fully utilized, realizing the efficient cascade utilization of solar and thermal energy, improving the overall energy conversion efficiency of the energy supply system, and at the same time, some power generation loops can be flexibly started and stopped according to actual power demand to output electrical energy of different power levels, thereby enhancing the peak-shaving reliability and operational economy of the power grid.

[0006] According to one embodiment of this application, the multi-stage temperature molten salt storage tank includes: a first to a third stage temperature molten salt storage tank, and a first path of a first stage heat exchanger and a first path of a second stage heat exchanger are sequentially connected between the first stage temperature molten salt storage tank and the second stage temperature molten salt storage tank, and a first path of a third stage heat exchanger is connected between the second stage temperature molten salt storage tank and the third stage temperature molten salt storage tank. The multi-stage power generation cycle includes: a first to a third stage power generation cycle, wherein the second path of the first stage heat exchanger is connected to the first stage power generation cycle, the second path of the second stage heat exchanger is connected to the second stage power generation cycle, and the second path of the third stage heat exchanger is connected to the third stage power generation cycle.

[0007] According to one embodiment of this application, the first-stage power generation cycle includes: a first-stage liquid storage tank, a first-stage pump, a second path of the first-stage heat exchanger, and a first-stage turbine device, wherein the first-stage pump and the second path of the first-stage heat exchanger are connected by a first path of a first preheating heat exchanger, and the second path of the first preheating heat exchanger is connected between the first path of the second-stage heat exchanger and the second-stage molten salt storage tank.

[0008] According to one embodiment of this application, the first-stage power generation cycle further includes: a heating box, the heating box being connected between the first-stage pump and the first preheating heat exchanger, and the heating box being equipped with an electric heater; And / or, The first-stage power generation cycle circuit also includes: a first liquid supply tank, which is connected to a first liquid supply pump.

[0009] According to one embodiment of this application, the second-stage power generation cycle includes: a second-stage liquid storage tank, a second-stage pump, a second path of the second-stage heat exchanger, and a second-stage turbine device; the power supply system further includes: The second liquid supply pump and the second preheating heat exchanger are connected in two ways: a first path of the second preheating heat exchanger is connected between the second stage turbine and the second stage liquid reservoir, and a second path of the second preheating heat exchanger is connected between the second liquid supply pump and the first stage liquid reservoir.

[0010] According to one embodiment of this application, the third-stage power generation cycle includes: a third-stage liquid storage tank, a third-stage pump, a second path of the third-stage heat exchanger, and a third-stage turbine; the power supply system further includes: The third liquid supply pump and the third preheating heat exchanger are connected, with the first path of the third preheating heat exchanger connected between the third-stage turbine and the third-stage liquid reservoir, and the second path of the third preheating heat exchanger connected between the third liquid supply pump and the first-stage liquid reservoir.

[0011] According to one embodiment of this application, the second-stage power generation cycle loop is provided with at least one first control valve.

[0012] And / or, a second control valve is provided between the second-stage temperature molten salt storage tank and the first path of the third-stage heat exchanger; The second-stage temperature molten salt storage tank is connected to the photothermal molten salt heating device via a first bypass control valve.

[0013] According to one embodiment of this application, the power supply system further includes: The heating circulation loop includes a heat exchange flow path of a connected heat accumulator and a third path of a second-stage heat exchanger. A water storage chamber and a phase change medium module isolated from the water storage chamber are formed inside the heat accumulator. The heat exchange flow path of the heat accumulator is in contact with the phase change medium module. The inlet of the water storage chamber is used to connect to a water source, and the outlet of the water storage chamber is used to connect to a water supply port.

[0014] According to one embodiment of this application, the heat storage device includes multiple stages, the inlet of the water storage chamber corresponding to each of the multiple stages of the heat storage device is used to connect to a water source, the outlet of the water storage chamber corresponding to each of the multiple stages of the heat storage device is used to connect to different water supply ports, the heat exchange flow paths of the multiple stages of the heat storage device are sequentially connected in the heating cycle loop, and the phase change temperature of the phase change medium of the multiple stages of the heat storage device is different.

[0015] According to one embodiment of this application, a shut-off valve is provided between the heat exchange flow paths corresponding to adjacent stages of the heat accumulators, and the multiple stages of the heat accumulators are respectively connected to the third path of the second stage heat exchanger through corresponding bypass shut-off valves.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial structural schematic diagram of the power supply system provided in the embodiments of this application; Figure 2 This is one of the structural schematic diagrams of the power supply system provided in the embodiments of this application; Figure 3 This is a second schematic diagram of the power supply system provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the trough-type photothermal molten salt heating device provided in the embodiments of this application; Figure 5 This is a schematic diagram of the tower-type photothermal molten salt heating device provided in the embodiments of this application; Figure 6 This is a schematic diagram of the Fresnel solar thermal collector molten salt heating device provided in the embodiments of this application.

[0018] Figure label: Energy supply system 10; The system includes a first-stage power generation loop 100, a first-stage liquid storage tank 101, a first-stage pump 102, a heating box 103, an electric heater 104, a first-stage turbine 105, a first liquid supply tank 106, a first liquid supply pump 107, a first-stage generator 108, a first three-way valve 109, a second three-way valve 110, a first preheating heat exchanger 150, a second preheating heat exchanger 120, a second liquid supply pump 121, a third preheating heat exchanger 130, and a third liquid supply pump 131. Second-stage power generation loop 200, second-stage liquid storage tank 201, second-stage pump 202, first control valve 203, second-stage turbine device 204, second-stage generator 205, first gas-liquid separator 206. The third-stage power generation loop 300, the third-stage liquid storage tank 301, the third-stage pump 302, the third-stage turbine device 303, the third-stage generator 304, and the second gas-liquid separator 305. Heating circulation loop 400, first shut-off valve 401, second shut-off valve 402, third shut-off valve 403, first bypass shut-off valve 404, second bypass shut-off valve 405, third bypass shut-off valve 406, third control valve 407, first stage heat accumulator 461, second stage heat accumulator 462, third stage heat accumulator 463. Molten salt circulation loop 500, first-stage temperature molten salt storage tank 501, second-stage temperature molten salt storage tank 502, third-stage temperature molten salt storage tank 503, second control valve 504, first bypass control valve 505, first-stage heat exchanger 510, second-stage heat exchanger 524, third-stage heat exchanger 530, solar thermal molten salt heating device 506, trough-type solar thermal molten salt heating device 5061, tower-type solar thermal molten salt heating device 5062, Fresnel solar collector type solar thermal molten salt heating device 5063; Water supply path 600, water source 601, water distribution valve 602, first-stage inlet valve 611, second-stage inlet valve 612, third-stage inlet valve 613, first-stage water pump 612, second-stage water pump 622, third-stage water pump 632, first-stage water supply valve 613, second-stage water supply valve 623, third-stage water supply valve 633, first-stage water supply port 614, second-stage water supply port 624, third-stage water supply port 634. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] The following is for reference. Figures 1-6 A power supply system 10 according to an embodiment of this application is described.

[0021] like Figure 1 As shown, the power supply system 10 includes a molten salt circulation loop 500 and a multi-stage power generation circulation loop.

[0022] The molten salt circulation loop 500 is a loop that uses molten salt as a heat storage and heat transfer medium, which can absorb and store heat and transfer the heat to a multi-stage power generation circulation loop.

[0023] like Figure 3 As shown, the molten salt circulation loop 500 includes a photothermal molten salt heating device 506, a multi-stage temperature molten salt storage tank connected in series, and a first path of a heat exchanger connected between two adjacent temperature molten salt storage tanks.

[0024] The solar thermal molten salt heating device 506 is the heat input source for the molten salt circulation loop 500, providing heat to the energy supply system 10. The solar thermal molten salt heating device 506 can be a device that uses solar thermal energy to heat molten salt. Figure 4 As shown, the photothermal molten salt heating device 506 can be a trough-type photothermal molten salt heating device 5061. For example... Figure 5 As shown, the photothermal molten salt heating device 506 can be a tower-type photothermal molten salt heating device 5062. For example... Figure 6 As shown, the photothermal molten salt heating device 506 can be a Fresnel solar collector type photothermal molten salt heating device 5063.

[0025] A molten salt storage tank is a container for storing or maintaining the temperature of molten salt. Molten salt storage tanks can be multi-stage, and multi-stage molten salt storage tanks can be connected in series. Multi-stage molten salt storage tanks can be insulated containers for storing molten salt at different temperatures.

[0026] The temperature-controlled molten salt storage tank can store the enormous thermal energy generated by the photothermal molten salt heating device 506 in the form of molten salt internal energy, realizing the "space-time transfer" of energy. For example, on sunny days, the enormous thermal energy generated by the photothermal molten salt heating device 506 can be stored in the molten salt in the temperature-controlled molten salt storage tank, and on cloudy days or at night, the heat-insulated molten salt can be used to generate electricity.

[0027] The temperature molten salt storage tank for storing low-temperature molten salt can collect the molten salt that has cooled down after releasing heat. When the low-temperature molten salt can be heated, the low-temperature molten salt in the temperature molten salt storage tank can be sent to the photothermal molten salt heating device 506 for heating.

[0028] Temperature-resistant molten salt storage tanks can be characterized by high temperature resistance, large capacity, and corrosion resistance.

[0029] A heat exchanger is a device that efficiently transfers heat between two or more fluids at different temperatures. These fluids may not be in direct contact with each other, but rather flow in different paths within the heat exchanger. Heat exchangers can be plate heat exchangers or shell-and-tube heat exchangers, among others.

[0030] There can be multiple heat exchangers, and the first path of each heat exchanger is connected between two adjacent molten salt storage tanks. When the molten salt flowing out of one of the molten salt storage tanks flows through the first path of one of the heat exchangers, the heat of the molten salt is transferred to the other paths of the heat exchanger, causing the temperature of the molten salt to drop. The working fluid in the other paths of the heat exchanger absorbs heat and rises in temperature.

[0031] The working process of the molten salt circulation loop 500 provided in this application embodiment is as follows: Low-temperature molten salt is heated to a high temperature in the photothermal molten salt heating device 506. The high-temperature molten salt flows into a temperature molten salt storage tank for storage. When power generation or supply is required, the high-temperature molten salt flows out from the temperature molten salt storage tank and can flow through the first path and other temperature molten salt storage tanks of the multi-stage heat exchanger. In the heat exchanger, the heat of the molten salt is transferred to the working fluid in other flow paths of the heat exchanger, and the temperature of the high-temperature molten salt gradually decreases. The low-temperature molten salt flows into the temperature molten salt storage tank for storage. When the low-temperature molten salt can be heated, the low-temperature molten salt in the temperature molten salt storage tank can be sent to the photothermal molten salt heating device 506 for heating.

[0032] The power generation cycle is a circuit that can absorb the heat energy of molten salt at 500°C and convert it into electrical energy. The power generation cycle can be multi-stage, and each stage can absorb the heat energy of molten salt at different temperatures and output electricity at different power levels.

[0033] Each of the multi-stage power generation cycle loops includes a corresponding stage liquid storage tank, a corresponding stage pump, a corresponding stage heat exchanger second path, and a corresponding stage turbine device. The second path of the heat exchanger is used to absorb heat from the corresponding first path, and the turbine device is powered and coupled to a generator.

[0034] A liquid storage tank is a container for storing liquid working fluid for power generation. For example, when the power generation cycle is a steam cycle, the liquid storage tank can be a feedwater tank; when the power generation cycle is an Organic Rankine Cycle (ORC), the liquid storage tank can be an organic working fluid tank. There can be multiple liquid storage tanks, with corresponding tanks used in the corresponding stage of the power generation cycle to store the corresponding stage's working fluid.

[0035] A pump is a device for pressurizing and transporting the working fluid for power generation. For example, when the power generation cycle is a steam cycle, the pump can be a feedwater pump; when the power generation cycle is an organic Rankine cycle, the pump can be an organic working fluid pump. A pump can extract and pressurize liquid working fluid from a reservoir, enabling it to flow in the power generation cycle. Multiple pumps can be used, with corresponding stages of pumps applied to corresponding stages of the power generation cycle to pressurize and transport the corresponding stage of working fluid.

[0036] The second path of the heat exchanger is the flow path through which the power generation working fluid flows. When the power generation working fluid of the corresponding stage flows in the second path of the corresponding stage heat exchanger, it can absorb heat from the molten salt in the first path of the corresponding stage heat exchanger, thereby increasing the temperature of the power generation working fluid of the corresponding stage.

[0037] The turbine is the working component in the power generation cycle, converting the thermal and pressure energy of the working fluid into mechanical energy. Specifically, high-temperature, high-pressure steam from the working fluid is injected onto the turbine blades, causing them to rotate. Multiple turbines can exist, each stage converting the thermal and pressure energy of its corresponding working fluid into mechanical energy.

[0038] A generator is a device that converts mechanical energy into electrical energy. There can be multiple generators, with corresponding turbine stages being power-coupled to corresponding generator stages. Each generator stage converts the mechanical energy generated by its corresponding turbine stage into electrical energy and can output electrical energy at that stage.

[0039] The working process of the power generation loop provided in this application embodiment is as follows: The pump pressurizes and circulates the liquid power generation medium in the reservoir. The power generation medium flows into the second path of the heat exchanger and absorbs the heat of the molten salt in the first path of the heat exchanger. The power generation medium heats up and at least partially vaporizes. The gaseous high-temperature power generation medium is introduced into the turbine and drives the turbine blades to rotate. In this process, the thermal energy of the power generation medium is converted into mechanical energy. The generator, which is powered and coupled to the turbine, converts the mechanical energy into electrical energy for output.

[0040] The aforementioned multi-stage power generation loops can operate independently. By adjusting the number and combination of the operational power generation loops, the power supply system 10 can flexibly match power demand and achieve power output at different power levels, maintaining efficient operation of the power supply system 10 while avoiding energy waste. For example, during peak electricity demand periods, all power generation loops can be activated to achieve full-power generation, while during periods of low electricity demand, only some power generation loops can operate.

[0041] The aforementioned multi-stage power generation cycle can fully utilize the thermal energy of molten salt at various grades, thereby improving the energy conversion efficiency of the power supply system 10, increasing power generation and reducing energy waste.

[0042] The working process of the power supply system 10 provided in this application embodiment is as follows: The solar thermal heating device heats the molten salt in the molten salt circulation loop 500. The high-temperature molten salt is stored in a high-temperature molten salt storage tank. When power is needed, the high-temperature molten salt flows through the first path of the multi-stage heat exchanger and the remaining high-temperature molten salt storage tanks, releasing heat step by step to the multi-stage power generation circulation loop. The power generation working fluid of the corresponding stage in the corresponding stage power generation circulation loop is driven by the pump of the corresponding stage. The power generation working fluid of the corresponding stage absorbs heat in the second path of the heat exchanger of the corresponding stage. The power generation working fluid of the corresponding stage drives the turbine blades of the corresponding stage to rotate and drives the generator of the corresponding stage to generate electricity, thereby realizing the efficient step-by-step conversion of thermal energy into electrical energy.

[0043] According to the energy supply system 10 provided in the embodiments of this application, by releasing the thermal energy stored in molten salt in stages and using it for cascade power generation, the thermal energy of various grades stored in molten salt can be fully utilized, realizing the efficient cascade utilization of solar and thermal energy, improving the overall energy conversion efficiency of the energy supply system 10, and at the same time, some power generation loops can be flexibly started and stopped according to actual power demand to output electrical energy of different power levels, thereby enhancing the peak-shaving reliability and operational economy of the power grid.

[0044] In some embodiments, such as Figure 3 As shown, the multi-stage temperature molten salt storage tank includes first to third stage temperature molten salt storage tanks, and the first stage temperature molten salt storage tank 501 and the second stage temperature molten salt storage tank 502 are sequentially connected by the first path of the first stage heat exchanger 510 and the first path of the second stage heat exchanger 524, and the second stage temperature molten salt storage tank 502 and the third stage temperature molten salt storage tank 503 are connected by the first path of the third stage heat exchanger 530.

[0045] The first-stage temperature molten salt storage tank 501 can be a container for storing high-temperature molten salt. After the molten salt is heated in the photothermal molten salt heating device 506, the high-temperature molten salt can flow into the first-stage temperature molten salt storage tank 501 for heat preservation.

[0046] The first-stage heat exchanger 510 is a device for efficiently transferring heat energy between two or more fluids at different temperatures. The first-stage heat exchanger 510 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0047] The second-stage heat exchanger 524 is a device for efficiently transferring heat energy between two or more fluids at different temperatures. The second-stage heat exchanger 524 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0048] The second-stage temperature molten salt storage tank 502 can be a container for storing medium-temperature molten salt. After the high-temperature molten salt flows through the first path of the first-stage heat exchanger 510 and the first path of the second-stage heat exchanger 524 and releases heat, the medium-temperature molten salt can flow into the second-stage temperature molten salt storage tank 502 for heat preservation.

[0049] The third-stage heat exchanger 530 is a device for efficiently transferring heat energy between two or more fluids at different temperatures. The third-stage heat exchanger 530 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0050] The third-stage molten salt storage tank 503 can be a container for storing low-temperature molten salt. After the medium-temperature molten salt flows through the first path of the third-stage heat exchanger 530 and releases heat, the low-temperature molten salt can flow into the third-stage molten salt storage tank 503 for heat preservation. When the low-temperature molten salt can be heated, it can flow out of the third-stage molten salt storage tank 503 and be sent to the photothermal molten salt heating device 506 for heating.

[0051] High-temperature molten salt can flow out from the first-stage molten salt storage tank 501 and into the first channel of the first-stage heat exchanger 510. The high-temperature molten salt releases heat and cools down to medium-high temperature molten salt. The medium-high temperature molten salt can flow into the first channel of the second-stage heat exchanger 524. The medium-high temperature molten salt releases heat and cools down to medium temperature molten salt. The medium temperature molten salt can flow into the second-stage molten salt storage tank 502 and be kept at a certain temperature. The medium temperature molten salt in the second-stage molten salt storage tank 502 can flow into the first channel of the third-stage heat exchanger 530. The medium temperature molten salt releases heat and cools down to low temperature molten salt. The low temperature molten salt can flow into the third-stage molten salt storage tank 503 and be kept at a certain temperature.

[0052] like Figure 3 As shown, the multi-stage power generation cycle includes first to third stage power generation cycle, and the second path of the first stage heat exchanger 510 is connected to the first stage power generation cycle 100, the second path of the second stage heat exchanger 524 is connected to the second stage power generation cycle 200, and the second path of the third stage heat exchanger 530 is connected to the third stage power generation cycle 300.

[0053] The heat source for the first-stage power generation cycle 100 comes from the thermal energy of high-temperature molten salt. The working fluid flowing in the first-stage power generation cycle 100 can be deionized water or carbon dioxide, etc.

[0054] In the first-stage heat exchanger 510, the medium flowing through the first path of the first-stage heat exchanger 510 is high-temperature molten salt from the first-stage molten salt storage tank 501, and the medium flowing through the second path of the first-stage heat exchanger 510 is the first-stage power generation working fluid of the first-stage power generation circulation loop 100. The first-stage power generation working fluid in the second path of the first-stage heat exchanger 510 can absorb the heat of the high-temperature molten salt in the first path of the first-stage heat exchanger 510, thereby increasing the temperature of the first-stage power generation working fluid and at least partially vaporizing it.

[0055] The heat source for the second-stage power generation cycle 200 comes from the thermal energy of medium- and high-temperature molten salt. The working fluid flowing through the second-stage power generation cycle 200 can be an organic working fluid or deionized water, etc.

[0056] In the second-stage heat exchanger 524, the medium flowing through the first path of the second-stage heat exchanger 524 is medium-high temperature molten salt from the first path of the first-stage heat exchanger 510, and the medium flowing through the second path of the second-stage heat exchanger 524 is the second-stage power generation working fluid of the second-stage power generation circulation loop 200. The second-stage power generation working fluid in the second path of the second-stage heat exchanger 524 can absorb the heat of the medium-high temperature molten salt in the first path of the second-stage heat exchanger 524, causing the temperature of the second-stage power generation working fluid to rise and at least partially vaporize.

[0057] The heat source for the third-stage power generation cycle 300 comes from the thermal energy of the low-temperature molten salt. The working fluid circulating in the third-stage power generation cycle 300 can be an organic working fluid, such as pentane, hexamethyldisiloxane, or toluene.

[0058] In the third-stage heat exchanger 530, the medium flowing through the first path of the third-stage heat exchanger 530 is medium-temperature molten salt from the second-stage molten salt storage tank 502, and the medium flowing through the second path of the third-stage heat exchanger 530 is the third-stage power generation working fluid of the third-stage power generation circulation loop 300. The third-stage power generation working fluid in the second path of the third-stage heat exchanger 530 can absorb the heat of the medium-temperature molten salt in the first path of the third-stage heat exchanger 530, causing the temperature of the third-stage power generation working fluid to rise and at least partially vaporize.

[0059] In some embodiments, such as Figure 3 As shown, the first-stage power generation cycle loop 100 includes a first-stage liquid storage tank 101, a first-stage pump 102, a second path of the first-stage heat exchanger 510, and a first-stage turbine device 105.

[0060] The first-stage liquid storage tank 101 is a container for storing the liquid first-stage power generation working fluid. When the first-stage power generation working fluid is deionized water, the first-stage liquid storage tank 101 can be a water supply tank.

[0061] The first-stage pump 102 is a device for pressurizing and conveying the first-stage power generation medium. When the first-stage power generation medium is deionized water, the first-stage pump 102 can be a feed water pump. The first-stage pump 102 can extract and pressurize the liquid first-stage power generation medium from the first-stage reservoir 101, allowing it to flow in the first-stage power generation cycle.

[0062] The first-stage turbine device 105 is the working component of the first-stage power generation cycle 100. It can convert the thermal energy and pressure energy of the first-stage power generation working fluid into mechanical energy. That is, the high-temperature and high-pressure steam of the first-stage power generation working fluid is injected onto the blades of the first-stage turbine device 105, which can make the blades of the first-stage turbine device 105 rotate.

[0063] The first preheating heat exchanger 150 is a device for efficiently transferring heat energy between two or more fluids at different temperatures. These fluids do not need to be in direct contact with each other, but rather flow in different flow paths within the first preheating heat exchanger 150. The first preheating heat exchanger 150 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0064] like Figure 3 As shown, the first path of the first preheating heat exchanger 150 is connected between the first stage pump 102 and the second path of the first stage heat exchanger 510. The second path of the first preheating heat exchanger 150 is connected between the first path of the second stage heat exchanger 524 and the second stage molten salt storage tank 502.

[0065] The first path of the first preheating heat exchanger 150 carries the first-stage power generation working fluid from the first-stage pump 102, while the second path carries medium-high temperature molten salt from the first path of the second-stage heat exchanger 524. Within the first preheating heat exchanger 150, the first-stage power generation working fluid in the first path can absorb heat from the medium-temperature molten salt in the second path, allowing the first-stage power generation working fluid to be preheated by the medium-temperature molten salt before flowing into the second path of the first-stage heat exchanger 510. This ensures effective utilization of the waste heat of the medium-temperature molten salt, reducing heat waste and decreasing the heat required from the high-temperature molten salt in the first path of the first-stage heat exchanger 510. This increases the energy utilization rate and economy of the power supply system 10. Furthermore, it reduces the severe thermal shock between the lower-temperature first-stage power generation working fluid and the high-temperature molten salt in the first-stage heat exchanger 510, protecting the first-stage heat exchanger 510.

[0066] In some embodiments, such as Figure 3 As shown, the first-stage power generation cycle circuit 100 includes a first liquid supply tank 106.

[0067] The first liquid supply tank 106 is a container used to collect and store the first-stage power generation working fluid discharged from the first-stage turbine unit 105 and condensed.

[0068] like Figure 3 As shown, the first liquid supply tank 106 is connected to the first liquid supply pump 107.

[0069] The first liquid supply pump 107 is a device capable of pressurizing and conveying the first-stage power generation medium stored in the first liquid supply tank 106, and can provide the first-stage power generation medium to the first-stage power generation circulation loop 100.

[0070] In some embodiments, such as Figure 3 As shown, the first-stage power generation cycle loop 100 includes a heating box 103, which is connected between the first-stage pump 102 and the first preheating heat exchanger 150, and the heating box 103 is equipped with an electric heater 104.

[0071] The electric heater 104 is an electric heating element located inside the heating chamber 103.

[0072] The heating chamber 103 is a container that holds the first-stage power generation medium and allows the electric heater 104 to heat it.

[0073] The first-stage power generation medium in the heating box 103 can absorb heat generated by the electric heater 104 and be heated before the first path of the first preheating heat exchanger 150. In this way, the first-stage power generation medium can be preheated quickly using electrical energy, improving the response speed and flexibility of the power supply system 10.

[0074] In some embodiments, such as Figure 3 As shown, the second-stage power generation cycle loop 200 includes a second-stage liquid storage tank 201, a second-stage pump 202, a second path of a second-stage heat exchanger 524, and a second-stage turbine device 204.

[0075] The second-stage liquid storage tank 201 is a container in the second-stage power generation cycle 200 that stores the liquid working fluid for the second-stage power generation. For example, when the second-stage power generation cycle 200 is a steam cycle, the second-stage liquid storage tank 201 can be a feedwater tank; when the second-stage power generation cycle 200 is an organic Rankine cycle, the second-stage liquid storage tank 201 can be an organic working fluid storage tank.

[0076] The second-stage pump 202 is a device for pressurizing and conveying the second-stage power generation working fluid in the second-stage power generation cycle 200. For example, when the second-stage power generation cycle 200 is a steam cycle, the second-stage pump 202 can be a feedwater pump; when the second-stage power generation cycle 200 is an organic Rankine cycle, the second-stage pump 202 can be an organic working fluid pump. The second-stage pump 202 can extract and pressurize the liquid second-stage power generation working fluid from the second-stage reservoir 201, allowing it to flow in the second-stage power generation cycle 200.

[0077] The second path of the second-stage heat exchanger 524 is the flow path of the second-stage power generation working fluid. In the second-stage heat exchanger 524, the second-stage power generation working fluid in the second path of the second-stage heat exchanger 524 absorbs heat from the molten salt in the first path of the second-stage heat exchanger 524, and the second-stage power generation working fluid heats up and at least partially vaporizes.

[0078] The second-stage turbine device 204 is the working component of the second-stage power generation cycle loop 200. It can convert the thermal energy and pressure energy of the second-stage power generation working fluid into mechanical energy. That is, the high-temperature and high-pressure second-stage power generation working fluid steam is injected onto the blades of the second-stage turbine device 204, which can make the blades of the second-stage turbine device 204 rotate and do work.

[0079] like Figure 3As shown, the second-stage power generation cycle loop 200 includes a first gas-liquid separator 206, which is connected between the second path of the second-stage heat exchanger 524 and the second-stage turbine device 204.

[0080] The first gas-liquid separator 206 can separate the gaseous second-stage power generation medium flowing out from the second channel of the second-stage heat exchanger 524, and allow the gaseous second-stage power generation medium to enter the second-stage turbine device 204 to do work.

[0081] like Figure 3 As shown, the power supply system 10 may include a second liquid supply pump 121 and a second preheating heat exchanger 120. The first path of the second preheating heat exchanger 120 is connected between the second-stage turbine device 204 and the second-stage liquid storage tank 201, and the second path of the second preheating heat exchanger 120 is connected between the second liquid supply pump 121 and the first-stage liquid storage tank 101.

[0082] The second liquid supply pump 121 is a device capable of pressurizing and conveying the first-stage power generation working fluid through the second path of the second preheating heat exchanger 120, and can provide the first-stage power generation working fluid for the first-stage power generation circulation loop 100.

[0083] The second preheating heat exchanger 120 is a device for efficiently transferring heat energy between two or more fluids at different temperatures. These fluids do not need to be in direct contact with each other, but rather flow in different flow paths within the second preheating heat exchanger 120. The second preheating heat exchanger 120 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0084] The first path of the second preheating heat exchanger 120 carries the second-stage power generation medium from the second-stage turbine 204, while the second path carries the first-stage power generation medium driven by the second liquid supply pump 121. Within the second preheating heat exchanger 120, the first-stage power generation medium in the second path absorbs heat from the second-stage power generation medium in the first path, causing the temperature of the first-stage power generation medium to rise and the temperature of the second-stage power generation medium to fall. In this way, the first-stage power generation circulation loop 100 can utilize the waste heat from the second-stage power generation medium flowing out of the second-stage turbine 204 in the second-stage power generation circulation loop 200, increasing the energy utilization rate of the energy supply system 10 and reducing energy waste.

[0085] In the second-stage power generation cycle loop 200, the outlet of the second-stage liquid storage tank 201 is connected to the inlet of the second-stage pump 202, the outlet of the second-stage pump 202 is connected to the second inlet of the second-stage heat exchanger 524, the second outlet of the second-stage heat exchanger 524 is connected to the inlet of the first gas-liquid separator 206, the outlet of the first gas-liquid separator 206 is connected to the air inlet of the second-stage turbine device 204, the air outlet of the second-stage turbine device 204 is connected to the first inlet of the second preheating heat exchanger 120, and the first outlet of the second preheating heat exchanger 120 is connected to the inlet of the second-stage liquid storage tank 201.

[0086] In some embodiments, the third-stage power generation loop 300 includes: a third-stage liquid reservoir 301, a third-stage pump 302, a second path of a third-stage heat exchanger 530, and a third-stage turbine device 303.

[0087] The third-stage reservoir 301 is a container for storing the liquid working fluid in the third-stage power generation cycle 300. For example, when the third-stage power generation cycle 300 is an organic Rankine cycle, the third-stage reservoir 301 can be an organic working fluid storage tank.

[0088] The third-stage pump 302 is a device for pressurizing and conveying the third-stage power generation working fluid in the third-stage power generation cycle 300. For example, when the third-stage power generation cycle 300 is an organic Rankine cycle, the third-stage pump 302 can be an organic working fluid pump. The third-stage pump 302 can extract and pressurize the liquid third-stage power generation working fluid from the third-stage reservoir 301, allowing it to flow in the third-stage power generation cycle 300.

[0089] The second path of the third-stage heat exchanger 530 is the flow path of the third-stage power generation working fluid. In the third-stage heat exchanger 530, the third-stage power generation working fluid in the second path of the third-stage heat exchanger 530 absorbs heat from the molten salt in the first path of the third-stage heat exchanger 530, and the third-stage power generation working fluid heats up and at least partially vaporizes.

[0090] The third-stage turbine device 303 is the working component of the third-stage power generation cycle loop 300. It can convert the thermal energy and pressure energy of the third-stage power generation working fluid into mechanical energy. That is, the high-temperature and high-pressure third-stage power generation working fluid steam is injected onto the blades of the third-stage turbine device 303, which can make the blades of the third-stage turbine device 303 rotate and do work.

[0091] like Figure 3 As shown, the third-stage power generation cycle loop 300 includes a second gas-liquid separator 305, which is connected between the second path of the third-stage heat exchanger 530 and the third-stage turbine device 303.

[0092] The second gas-liquid separator 305 can separate the gaseous third-stage power generation working fluid flowing out from the second path of the third-stage heat exchanger 530, and allow the gaseous third-stage power generation working fluid to enter the third-stage turbine device 303 to do work.

[0093] like Figure 3 As shown, the power supply system 10 may include a third liquid supply pump 131 and a third preheating heat exchanger 130. The first path of the third preheating heat exchanger 130 is connected between the third-stage turbine device 303 and the third-stage liquid storage tank 301, and the second path of the third preheating heat exchanger 130 is connected between the third liquid supply pump 131 and the first-stage liquid storage tank 101.

[0094] The third liquid supply pump 131 is a device capable of pressurizing and conveying the first-stage power generation working fluid through the second path of the third preheating heat exchanger 130, and can provide the first-stage power generation working fluid for the first-stage power generation circulation loop 100.

[0095] The third preheating heat exchanger 130 is a device for efficiently transferring heat energy between two or more fluids at different temperatures. These fluids do not need to be in direct contact with each other, but rather flow in different flow paths within the third preheating heat exchanger 130. The third preheating heat exchanger 130 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0096] The first path of the third preheating heat exchanger 130 carries the third-stage power generation medium from the third-stage turbine 303, while the second path carries the first-stage power generation medium driven by the third liquid supply pump 131. Within the third preheating heat exchanger 130, the first-stage power generation medium in the second path absorbs heat from the third-stage power generation medium in the first path, causing the temperature of the first-stage power generation medium to rise and the temperature of the third-stage power generation medium to fall. Thus, the first-stage power generation circulation loop 100 can utilize the waste heat from the third-stage power generation medium flowing out of the third-stage turbine 303 in the third-stage power generation circulation loop 300, increasing the energy utilization rate of the energy supply system 10 and reducing energy waste.

[0097] In the third-stage power generation loop 300, the outlet of the third-stage liquid receiver 301 is connected to the inlet of the third-stage pump 302, the outlet of the third-stage pump 302 is connected to the second inlet of the third-stage heat exchanger 530, the second outlet of the third-stage heat exchanger 530 is connected to the inlet of the second gas-liquid separator 305, the outlet of the second gas-liquid separator 305 is connected to the inlet of the third-stage turbine 303, the outlet of the third-stage turbine 303 is connected to the first inlet of the third preheating heat exchanger 130, and the first outlet of the third preheating heat exchanger 130 is connected to the inlet of the third-stage liquid receiver 301.

[0098] In some embodiments, such as Figure 3As shown, the power supply system 10 may include a first three-way valve 109 and a second three-way valve 110.

[0099] The first valve port of the first three-way valve 109 is the inlet, and the first valve port of the first three-way valve 109 is connected to the outlet of the first liquid supply tank 106; the second valve port of the first three-way valve 109 is the inlet, and the second valve port of the first three-way valve 109 is connected to the third valve port of the second three-way valve 110; the third valve port of the first three-way valve 109 is the outlet, and the third valve port of the first three-way valve 109 is connected to the inlet of the first-stage liquid reservoir 101.

[0100] That is, the first three-way valve 109 can receive the first-stage power generation working fluid from the first liquid supply tank 106 and the second three-way valve 110, and introduce it into the first-stage liquid storage tank 101.

[0101] The first port of the second three-way valve 110 is the inlet, and the first port of the second three-way valve 110 is connected to the outlet of the second preheating heat exchanger 120; the second port of the second three-way valve 110 is the inlet, and the second port of the second three-way valve 110 is connected to the outlet of the second preheating heat exchanger 130; the third port of the second three-way valve 110 is the outlet, and the third port of the second three-way valve 110 is connected to the second port of the first three-way valve 109.

[0102] That is, the second three-way valve 110 can accept the first-stage power generation working fluid from the second path of the second preheating heat exchanger 120 and the second path of the third preheating heat exchanger 130, and introduce it into the first-stage liquid storage tank 101 through the first three-way valve 109.

[0103] By adjusting the first three-way valve 109 and the second three-way valve 110, the flow rate or flow magnitude of the first-stage power generation working fluid from the first liquid supply tank 106, the second path of the second preheating heat exchanger 120, and the second path of the third preheating heat exchanger 130 can be adjusted.

[0104] In some embodiments, such as Figure 3 As shown, the second-stage power generation loop 200 is equipped with at least one first control valve 203.

[0105] The first control valve 203 is an adjustable valve installed in the second-stage power generation cycle 200. The first control valve 203 can regulate the on / off state of the second-stage power generation medium in the second-stage power generation cycle 200, or regulate the flow rate of the second-stage power generation medium. By adjusting the first control valve 203, the operating state and output power of the second-stage power generation cycle 200 can be adjusted. One or more first control valves 203 can be installed.

[0106] A first control valve 203 can be installed on the inlet connection pipe of the second path of the second-stage heat exchanger 524, and a first control valve 203 can be installed on the outlet connection pipe of the second path of the second-stage heat exchanger 524. By controlling the flow of the second-stage power generation working fluid into or out of the second path of the second-stage heat exchanger 524, the power output of the second-stage power generation circulation loop 200 can be adjusted.

[0107] When the opening of the first control valve 203 is increased, the total heat absorbed by the second-stage power generation medium of the second-stage heat exchanger 524 from the medium-high temperature molten salt of the first-stage heat exchanger 524 increases, which can increase the output power of the second-stage turbine device 204 and increase the power supply of the second-stage power generation circulation loop 200.

[0108] When the opening of the first control valve 203 is reduced, the total heat absorbed by the second-stage power generation working fluid of the second path of the second-stage heat exchanger 524 from the medium-high temperature molten salt of the first path of the second-stage heat exchanger 524 is reduced, which can reduce the output power of the second-stage turbine device 204 and reduce the power supply power of the second-stage power generation circulation loop 200.

[0109] When the first control valve 203 is disconnected, the second-stage power generation working fluid stops circulating, and the second-stage power generation circulation loop 200 stops generating electricity.

[0110] In this way, the power generation of the second-stage power generation loop 200 can be adjusted more flexibly and accurately according to the real-time power demand, and the first control valve 203 can help realize the 10-stage power supply and peak shaving functions of the power supply system.

[0111] Of course, the first control valve 203 can also be installed in the steam inlet pipe of the second-stage turbine 204 or the inlet pipe of the second-stage pump 202.

[0112] In some embodiments, such as Figure 3 As shown, a second control valve 504 is provided between the second-stage temperature molten salt storage tank 502 and the first path of the third-stage heat exchanger 530.

[0113] The second control valve 504 is an adjustable valve installed between the second-stage molten salt storage tank 502 and the first path of the third-stage heat exchanger 530. The second control valve 504 can regulate the on / off flow of the intermediate-temperature molten salt in the molten salt circulation loop 500 to the first path of the third-stage heat exchanger 530, or regulate the flow rate of the intermediate-temperature molten salt to the first path of the third-stage heat exchanger 530. By adjusting the second control valve 504, the operating status and output power of the third-stage power generation circulation loop 300 can be adjusted.

[0114] When the opening of the second control valve 504 is increased, the flow rate of the medium-temperature molten salt flowing out of the second-stage molten salt storage tank 502 increases, the flow rate of the medium-temperature molten salt flowing to the first path of the third-stage heat exchanger 530 increases, and the total heat absorbed by the third-stage power generation working fluid in the second path of the third-stage heat exchanger 530 from the medium-temperature molten salt in the first path of the third-stage heat exchanger 530 increases. This can increase the output power of the third-stage turbine 303 and increase the power supply of the third-stage power generation cycle 300.

[0115] When the opening of the second control valve 504 is reduced, the flow rate of the medium-temperature molten salt flowing out of the second-stage molten salt storage tank 502 decreases, the flow rate of the medium-temperature molten salt flowing to the first path of the third-stage heat exchanger 530 decreases, and the total heat absorbed by the third-stage power generation working fluid in the second path of the third-stage heat exchanger 530 from the medium-temperature molten salt in the first path of the third-stage heat exchanger 530 decreases. This can reduce the output power of the third-stage turbine 303 and reduce the power supply power of the third-stage power generation cycle 300.

[0116] When the second control valve 504 is disconnected, the medium-temperature molten salt does not flow to the first path of the third-stage heat exchanger 530, and the third-stage power generation working medium in the second path of the third-stage heat exchanger 530 cannot absorb heat in the third-stage heat exchanger 530, so the third-stage power generation circulation loop 300 stops generating electricity.

[0117] In this way, the power generation of the third-stage power generation loop 300 can be adjusted more flexibly and accurately according to the real-time power demand, and the second control valve 504 can help realize the 10-stage power supply and peak shaving functions of the power supply system.

[0118] like Figure 3 As shown, the second-stage temperature molten salt storage tank 502 is connected to the photothermal molten salt heating device 506 via a first bypass control valve 505.

[0119] The first bypass control valve 505 allows the medium-temperature molten salt to flow directly back from the second-stage temperature molten salt storage tank 502 to the photothermal molten salt heating device 506, without passing through the first path of the subsequent third-stage heat exchanger 530 and the third-stage temperature molten salt storage tank 502.

[0120] The temperature of the medium-temperature molten salt flowing out of the second-stage molten salt storage tank 502 is higher than that of the low-temperature molten salt flowing out of the third-stage molten salt storage tank 502. When the power supply system does not require power from the third-stage power generation loop 300, the medium-temperature molten salt can be sent back to the photothermal molten salt heating device 506 for heating by disconnecting the second control valve 504 and opening the first bypass control valve 505. In this way, the photothermal molten salt heating device 506 directly heats the medium-temperature molten salt, which can save a lot of energy and time compared to directly heating the low-temperature molten salt, can quickly restore the high-temperature molten salt reserves, improve the response speed of the power supply system 10, and reduce the loss and consumption of molten salt heat.

[0121] In some embodiments, such as Figure 2 As shown, the energy supply system 10 includes a heating circulation loop 400.

[0122] The heating circulation loop 400 is a circulation loop that collects the heat energy from the molten salt circulation loop 500 and transfers the heat energy to the water supply flow path 600.

[0123] like Figure 3 As shown, the heating cycle loop 400 includes a heat exchange flow path of a connected heat accumulator and a third path of a second-stage heat exchanger 524.

[0124] A heat accumulator is a heat storage container that can store thermal energy and release heat stably when heating is needed, allowing the time of heat generation to be mismatched with the time of use.

[0125] A heat accumulator has a heat exchange flow path. This flow path is a pipe that runs through the interior of the accumulator, allowing the heating medium to flow. This flow path can be tightly surrounded by a phase change medium. The heating medium can be molten salt, deionized water, or heat transfer oil, etc.

[0126] The heat exchange flow path of the heat accumulator is connected in series with the third path of the second-stage heat exchanger 524. The heating medium can flow through the third path of the second-stage heat exchanger 524 and then through the heat exchange flow path of the heat accumulator.

[0127] In the second-stage heat exchanger 524, the medium flowing through the first path of the second-stage heat exchanger 524 is medium-high temperature molten salt from the first path of the first-stage heat exchanger 510, and the medium flowing through the third path of the second-stage heat exchanger 524 is the heating medium of the heating circulation loop 400. The heating medium in the third path of the second-stage heat exchanger 524 can absorb the heat from the medium-high temperature molten salt in the first path of the second-stage heat exchanger 524, thereby increasing the temperature of the heating medium.

[0128] The heat accumulator contains a water storage chamber and a phase change medium module that is isolated from the water storage chamber.

[0129] The heat accumulator has a water storage chamber inside. The water storage chamber of the heat accumulator is a pipe or jacket space surrounded by a phase change medium inside the heat accumulator, through which water can flow.

[0130] The heat accumulator contains a phase change medium module. The phase change medium module includes the phase change medium itself and a storage container for it within the heat accumulator. A phase change medium is a material that undergoes a phase change at a specific phase change temperature, such as changing from a solid to a liquid or vice versa, and absorbs or releases a large amount of latent heat during the phase change process.

[0131] The water storage chamber is isolated from the phase change medium module, meaning that the water in the storage chamber and the phase change medium in the phase change medium module can exchange heat in isolation, but the storage chamber and the phase change medium module are not connected. Inside the heat accumulator, the water in the storage chamber can exchange heat with the phase change medium inside the heat accumulator, causing the water to absorb heat from the heating medium and thus increase its temperature.

[0132] The heat exchange flow path of the heat accumulator is in contact with the phase change medium module.

[0133] That is, inside the heat accumulator, the heating medium in the heat exchange flow path of the heat accumulator can exchange heat with the phase change medium inside the heat accumulator, so that the phase change medium absorbs the heat of the heating medium, and the heat exchange flow path of the heat accumulator is not connected to the phase change medium module.

[0134] The working process of the heating circulation loop 400 provided in this embodiment is as follows: The heating medium flows into the third path of the second-stage heat exchanger 524 and absorbs heat from the medium-high temperature molten salt in the first path of the second-stage heat exchanger 524, causing its temperature to rise. The heated heating medium flows into the heat exchange path of the heat storage device and releases heat to the phase change medium in the heat storage device, causing its temperature to drop. The cooled heating medium then flows back into the third path of the second-stage heat exchanger 524, thus completing the heating cycle.

[0135] The water supply path 600 includes the water storage chamber of the heat storage tank, the water source 601, and the water supply outlet.

[0136] Water source 601 is the source of cold water for supplying and replenishing the water supply path 600, and can be a water tower or water tank, etc.

[0137] The water supply outlet is the hot water outlet of the water supply flow path 600, which can be connected to the hot water delivery pipe of the heat user.

[0138] like Figure 3 As shown, the inlet of the water storage chamber is used to connect to the water source 601, and the outlet of the water storage chamber is used to connect to the water supply port.

[0139] The working process of the water supply path 600 provided in this embodiment is as follows: Cold water can flow out from water source 601 and enter the water storage chamber of the heat accumulator. The water in the water storage chamber of the heat accumulator can absorb the heat of the phase change medium in the heat accumulator and its temperature rises. The water with the increased temperature can flow from the water supply port to the hot water delivery pipe of the heat user.

[0140] In some embodiments, such as Figure 3 As shown, the heat accumulator consists of multiple stages, and the phase change temperatures of the phase change media in the multiple stages of the heat accumulator are different.

[0141] For example, a heat storage device may include three stages: a first-stage heat storage device 461, a second-stage heat storage device 462, and a third-stage heat storage device 463.

[0142] A certain temperature gradient can be formed between the different phase change temperatures of the phase change materials in the three types of heat accumulators.

[0143] The phase change temperature of the phase change medium in the first-stage heat accumulator 461 can be the highest among the three phase change temperatures. For example, the phase change medium in the first-stage heat accumulator 461 can be magnesium chloride hexahydrate, and the phase change temperature of magnesium chloride hexahydrate is 117℃.

[0144] The phase change temperature of the phase change medium in the second-stage heat accumulator 462 can be the second highest among the three phase change temperatures. For example, the phase change medium in the second-stage heat accumulator 462 can be xylitol, whose phase change temperature is 94°C.

[0145] The phase change temperature of the phase change medium in the third-stage heat accumulator 463 can be the lowest among the three phase change temperatures. For example, the phase change medium in the third-stage heat accumulator 463 can be barium hydroxide octahydrate, and the phase change temperature of barium hydroxide octahydrate is 78℃.

[0146] like Figure 3 As shown, the heat exchange flow paths of the multi-stage heat accumulators are connected in series in the heating circulation loop 400.

[0147] For example, in the heating circulation loop 400, the heat exchange flow path of the first-stage heat accumulator 461, the heat exchange flow path of the second-stage heat accumulator 462, and the heat exchange flow path of the third-stage heat accumulator 463 are connected in series.

[0148] Specifically, the inlet of the heat exchange flow path of the first-stage heat accumulator 461 can be connected to the outlet of the third path of the second-stage heat exchanger 524, and the outlet of the heat exchange flow path of the first-stage heat accumulator 461 can be connected to the inlet of the heat exchange flow path of the second-stage heat accumulator 462; the inlet of the heat exchange flow path of the second-stage heat accumulator 462 can be connected to the outlet of the heat exchange flow path of the first-stage heat accumulator 461, and the outlet of the heat exchange flow path of the second-stage heat accumulator 462 can be connected to the inlet of the heat exchange flow path of the third-stage heat accumulator 463; the inlet of the heat exchange flow path of the third-stage heat accumulator 463 can be connected to the outlet of the heat exchange flow path of the second-stage heat accumulator 462, and the outlet of the heat exchange flow path of the third-stage heat accumulator 463 can be connected to the inlet of the third path of the second-stage heat exchanger 524.

[0149] In other words, in the heating circulation loop 400, the third path of the second-stage heat exchanger 524, the heat exchange path of the first-stage heat accumulator 461, the heat exchange path of the second-stage heat accumulator 462, and the heat exchange path of the third-stage heat accumulator 463 can be connected sequentially.

[0150] like Figure 3 As shown, the inlets of the water storage chambers corresponding to the multi-stage heat accumulators are all used to connect to the water source 601, and the outlets of the water storage chambers corresponding to the multi-stage heat accumulators are used to connect to different water supply outlets.

[0151] The water supply path 600 can include multiple levels, such as three levels: the first level water supply path 600, the second level water supply path 600, and the third level water supply path 600.

[0152] The first-stage water supply path 600 may include a water storage chamber of a first-stage heat accumulator 461 and a first-stage water supply port 614. Cold water can flow out from the water source 601 and enter the water storage chamber of the first-stage heat accumulator 461. The water in the water storage chamber of the first-stage heat accumulator 461 can absorb the heat from the phase change medium in the first-stage heat accumulator 461 and become high-temperature water. The high-temperature water can flow from the first-stage water supply port 614 to the hot water delivery pipeline of the heat user.

[0153] The second-stage water supply path 600 may include a water storage chamber of the second-stage heat accumulator 462 and a second-stage water supply port 624. Cold water can flow out from the water source 601 and enter the water storage chamber of the second-stage heat accumulator 462. The water in the water storage chamber of the second-stage heat accumulator 462 can absorb heat from the phase change medium in the second-stage heat accumulator 462 and become medium-high temperature water. The medium-high temperature water can flow from the second-stage water supply port 624 to the hot water delivery pipeline of the heat user.

[0154] The third-stage water supply path 600 may include a water storage chamber of a third-stage heat accumulator 463 and a third-stage water supply port 634. Cold water can flow out from the water source 601 and enter the water storage chamber of the third-stage heat accumulator 463. The water in the water storage chamber of the third-stage heat accumulator 463 can absorb heat from the phase change medium in the third-stage heat accumulator 463 and become medium-temperature water. The medium-temperature water can flow from the third-stage water supply port 634 to the hot water delivery pipeline of the heat user.

[0155] like Figure 3 As shown, the water supply path 600 may include a water distribution valve 602, and the corresponding stage of the water supply path 600 may include a corresponding stage inlet valve, a corresponding stage water pump, and a corresponding stage water supply valve.

[0156] The water distribution valve 602 is a valve that directs water from the water source 601 to different stages of the water supply path 600. The inlet of the water distribution valve 602 can be connected to the water source 601, and the outlet of the corresponding stage of the water distribution valve 602 can be connected to the inlet of the corresponding stage of the inlet valve.

[0157] According to the water supply demand, the water distribution valve 602 distributes water to the water supply path 600 that needs to work.

[0158] The corresponding inlet valve, the corresponding water pump, the corresponding heat storage tank's water storage chamber, the corresponding water supply valve, and the corresponding water supply outlet can be connected sequentially.

[0159] According to the water supply demand of the corresponding water supply path 600, the on / off state or flow rate of water from water source 601 in the corresponding water supply path 600 can be controlled by controlling the inlet valve of the corresponding level.

[0160] The corresponding stage of the water pump can pressurize and transport water in the corresponding stage of the water supply path 600. For example, the first stage water pump 612 can pressurize and transport water in the first stage water supply path 600, the second stage water pump 622 can pressurize and transport water in the second stage water supply path 600, and the third stage water pump 632 can pressurize and transport water in the third stage water supply path 600.

[0161] According to the water supply demand of the corresponding water supply path 600, the on / off state or flow rate of the water about to flow out of the corresponding water supply port in the corresponding water supply path 600 can be controlled by controlling the corresponding water supply valve.

[0162] In this way, the water supply volume and start / stop of each level of water supply path 600 can be adjusted according to the real-time changes in the user's demand for hot water at different temperatures. Any level of water supply path 600 can be adjusted or shut down independently without affecting other levels of water supply path 600.

[0163] In some embodiments, such as Figure 3 As shown, a shut-off valve is provided between the heat exchange flow paths of adjacent heat accumulators, and the multi-stage heat accumulators are respectively connected to the third path of the second-stage heat exchanger 524 through corresponding bypass shut-off valves.

[0164] A first shut-off valve 401 may be provided between the outlet of the heat exchange flow path of the first-stage heat accumulator 461 and the inlet of the heat exchange flow path of the first-stage heat accumulator 461; a second shut-off valve 402 may be provided between the outlet of the heat exchange flow path of the second-stage heat accumulator 462 and the inlet of the heat exchange flow path of the third-stage heat accumulator 463; and a third shut-off valve 403 may be provided between the outlet of the heat exchange flow path of the third-stage heat accumulator 463 and the inlet of the third path of the second-stage heat exchanger 524.

[0165] A first bypass valve 404 may be provided between the outlet of the heat exchange flow path of the first-stage heat accumulator 461 and the inlet of the third bypass valve 406. A second bypass valve 405 may be provided between the outlet of the heat exchange flow path of the second-stage heat accumulator 462 and the inlet of the third bypass valve 406. The third bypass valve 406 may receive the heating medium from the heat exchange flow path of the first-stage heat accumulator 461 and / or the heat exchange flow path of the second-stage heat accumulator 462 and introduce it into the third path of the second-stage heat exchanger 524.

[0166] When the first shut-off valve 401, the second shut-off valve 402, and the third shut-off valve 403 are open, and the first bypass shut-off valve 404, the second bypass shut-off valve 405, and the third bypass shut-off valve 406 are closed, the first-stage heat accumulator 461, the second-stage heat accumulator 462, and the third-stage heat accumulator 463 are connected in series. The phase change medium of the first-stage heat accumulator 461, the phase change medium of the second-stage heat accumulator 462, and the phase change medium of the third-stage heat accumulator 463 can respectively absorb the heat from the heat exchange flow path of the corresponding stage heat accumulator. If the inlet valve and the supply valve of the first-stage water supply flow path 600, the second-stage water supply flow path 600, and the third-stage water supply flow path 600 are opened, the first-stage water supply flow path 600, the second-stage water supply flow path 600, and the third-stage water supply flow path 600 can respectively output high-temperature water, medium-high-temperature water, and medium-temperature water. If only the inlet valves and supply valves of the second-stage water supply path 600 and the third-stage water supply path 600 are opened, and the first-stage inlet valve 611 and the first-stage supply valve 613 of the first-stage water supply path 600 are closed, the second-stage water supply path 600 and the third-stage water supply path 600 can output medium-high temperature water and medium-temperature water respectively.

[0167] When the first shut-off valve 401 is open, the second shut-off valve 402 and the third shut-off valve 403 are closed, the first bypass shut-off valve 404 is closed, and the second bypass shut-off valve 405 and the third bypass shut-off valve 406 are open, the first-stage heat accumulator 461 and the second-stage heat accumulator 462 are connected in series. The phase change medium of the first-stage heat accumulator 461 and the phase change medium of the second-stage heat accumulator 462 can respectively absorb the heat from the heat exchange flow path of the corresponding stage heat accumulator. If the inlet valve and the supply valve of the first-stage water supply flow path 600 and the second-stage water supply flow path 600 are opened, the first-stage water supply flow path 600 and the second-stage water supply flow path 600 can respectively output high-temperature water and medium-high-temperature water. If the second-stage inlet valve 612 and the second-stage supply valve 623 of the second-stage water supply flow path 600 are opened, and the first-stage inlet valve 611 and the first-stage supply valve 613 of the first-stage water supply flow path 600 are closed, the second-stage water supply flow path 600 can output medium-high-temperature water.

[0168] When the first shut-off valve 401, the second shut-off valve 402, and the third shut-off valve 403 are closed, the first bypass shut-off valve 404 and the third bypass shut-off valve 406 are open, and the second bypass shut-off valve 405 is closed, the phase change medium of the first-stage heat accumulator 461 can absorb the heat from the heat exchange flow path of the first-stage heat accumulator 461. If the first-stage inlet valve 611 and the first-stage supply valve 613 of the first-stage water supply flow path 600 are opened, the first-stage water supply flow path 600 can output high-temperature water.

[0169] When the first shut-off valve 401 is closed, the second shut-off valve 402 and the third shut-off valve 403 are open, the first bypass shut-off valve 404 and the second bypass shut-off valve 405 are open, and the third bypass shut-off valve 406 is closed, the first-stage heat accumulator 461 and the third-stage heat accumulator 463 are connected in series. The phase change medium of the first-stage heat accumulator 461 and the phase change medium of the third-stage heat accumulator 463 can respectively absorb the heat from the heat exchange flow path of the corresponding stage heat accumulator. If the inlet valve and the supply valve of the first-stage water supply flow path 600 and the third-stage water supply flow path 600 are opened, the first-stage water supply flow path 600 and the third-stage water supply flow path 600 can respectively output high-temperature water and medium-temperature water. If the third-stage inlet valve 613 and the third-stage supply valve 633 of the third-stage water supply path 600 are opened, and the first-stage inlet valve 611 and the first-stage supply valve 613 of the first-stage water supply path 600 are closed, the third-stage water supply path 600 can output medium-temperature water.

[0170] In this way, the opening and closing of each shut-off valve and bypass shut-off valve can be adjusted according to the real-time changes in the user's demand for hot water at different temperatures. The flow rate and opening and closing of the corresponding inlet valve and supply valve can also be adjusted to achieve the supply of hot water at different temperatures. This can also improve the energy utilization rate of the power supply system and reduce energy waste.

[0171] Of course, the number of stages in the multi-stage heat storage device and the multi-stage water supply flow path 600 does not have to be three stages; for example, it can be two, four, or five stages.

[0172] In some embodiments, such as Figure 3 As shown, the heating circulation loop 400 is equipped with at least one second control valve 504.

[0173] The second control valve 504 is an adjustable valve installed in the heating circulation loop 400. The second control valve 504 can regulate the on / off state of the heating medium in the heating circulation loop 400, or regulate the flow rate of the heating medium. By adjusting the second control valve 504, the operating state and output power of the heating circulation loop 400 can be adjusted. One or more second control valves 504 can be installed.

[0174] A second control valve 504 can be installed on the inlet connection pipe of the third path of the second-stage heat exchanger 524, and a second control valve 504 can be installed on the outlet connection pipe of the third path of the second-stage heat exchanger 524. By controlling the heating working fluid flowing into or out of the third path of the heat exchanger, the power output of the heating circulation loop 400 can be adjusted.

[0175] When the opening of the second control valve 504 is increased, the total heat absorbed by the heating medium of the third path of the second-stage heat exchanger 524 from the medium-high temperature molten salt of the first path of the second-stage heat exchanger 524 increases, which can increase the heating power of the heating circulation loop 400.

[0176] When the opening of the second control valve 504 is reduced, the total heat absorbed by the heating medium of the third path of the second-stage heat exchanger 524 from the medium-high temperature molten salt of the first path of the second-stage heat exchanger 524 is reduced, which can reduce the heating power of the heating circulation loop 400.

[0177] When the second control valve 504 is disconnected, the heating medium stops circulating, and the heating circulation loop 400 stops supplying heat.

[0178] In this way, the heat supply of the heating circulation loop 400 can be adjusted more flexibly and accurately according to the real-time demand for hot water.

[0179] The following is combined with Figures 1-6 The power supply system 10 of the present application is described.

[0180] The power supply system 10 includes a molten salt circulation loop 500, a first-stage power generation circulation loop 100, a second-stage power generation circulation loop 200, a third-stage power generation circulation loop 300, a heating circulation loop 400, and a water supply path 600.

[0181] The molten salt circulation loop 500 includes a photothermal molten salt heating device 506, a first-stage molten salt storage tank 501, a first path of a first-stage heat exchanger 510, a first path of a second-stage heat exchanger 524, a second path of a first preheating heat exchanger 150, a second-stage molten salt storage tank 502, a first path of a third-stage heat exchanger 530, and a third-stage molten salt storage tank 503, connected sequentially. A second control valve 504 is provided between the second-stage molten salt storage tank 502 and the first path of the third-stage heat exchanger 530. The second-stage molten salt storage tank 502 is connected to the photothermal molten salt heating device 506 via a first bypass control valve 505.

[0182] The first-stage power generation loop 100 includes, in sequence, a first-stage liquid storage tank 101, a first-stage pump 102, a heating tank 103, a first path of a first preheating heat exchanger 150, a second path of a first-stage heat exchanger 510, a first-stage turbine 105, and a first supply tank 106. The heating tank 103 is equipped with an electric heater 104. The first-stage turbine 105 is powered and coupled to a first-stage generator 108. The first supply tank 106 is connected to a first supply pump 107. The first path of the second preheating heat exchanger 120 is connected between the second-stage turbine 204 and the second-stage liquid storage tank 201, and the second path of the second preheating heat exchanger 120 is connected between the second supply pump 121 and the first-stage liquid storage tank 101. The first path of the third preheating heat exchanger 130 is connected between the third-stage turbine 303 and the third-stage liquid reservoir 301, and the second path of the third preheating heat exchanger 130 is connected between the third liquid supply pump 131 and the first-stage liquid reservoir 101.

[0183] The second-stage power generation loop 200 includes, in sequence, a second-stage liquid receiver 201, a second-stage pump 202, a second path of a second-stage heat exchanger 524, a first gas-liquid separator 206, a second-stage turbine 204, and a first path of a second preheating heat exchanger 120. The second-stage turbine 204 is poweredly coupled to a second-stage generator 205. The second-stage power generation loop 200 is equipped with at least one first control valve 203.

[0184] The third-stage power generation loop 300 includes a third-stage liquid storage tank 301, a third-stage pump 302, a second path of a third-stage heat exchanger 530, a second gas-liquid separator 305, a third-stage turbine 303, and a first path of a third preheating heat exchanger 130, all connected sequentially. The third-stage turbine 303 is powered by a third-stage generator 304.

[0185] The heating circulation loop 400 includes a third path of the second-stage heat exchanger 524 and heat exchange paths of multiple stage heat accumulators connected in series. The phase change temperatures of the phase change media in the multiple stage heat accumulators are different. A shut-off valve is provided between the heat exchange paths of adjacent stage heat accumulators, and each stage heat accumulator is connected to the third path of the second-stage heat exchanger 524 via a corresponding bypass shut-off valve. The heating circulation loop 400 is equipped with at least one third control valve 407.

[0186] The water supply path 600 includes a water source 601. The water supply path 600 includes multiple stages, and each stage of the water supply path 600 includes a water storage chamber of the corresponding stage's heat storage unit and a water supply outlet of the corresponding stage. The water storage chamber of the multi-stage heat storage unit is connected to the water source 601.

[0187] The energy supply system 10 provided in this embodiment works in concert through a molten salt circulation loop 500, a first-stage power generation circulation loop 100, a second-stage power generation circulation loop 200, a third-stage power generation circulation loop 300, a heating circulation loop 400, and a water supply path 600. The working principle of the energy supply system 10 is as follows: In the molten salt circulation loop 500, the low-temperature molten salt is heated to a high temperature in the photothermal molten salt heating device 506, and the high-temperature molten salt is stored in the first-stage temperature molten salt storage tank 501. The high-temperature molten salt in the first-stage temperature molten salt storage tank 501 can flow into the first path of the first-stage heat exchanger 510, and transfer heat to the first-stage power generation working fluid in the second path of the first-stage heat exchanger 510 for cooling. The molten salt can then flow into the first path of the second-stage heat exchanger 524. When the first control valve 203 and the third control valve 407 are opened, the heat of the molten salt can be transferred to the second-stage heat exchanger 524. The second-stage power generation medium of the second path of the second-stage heat exchanger 524 and the third-stage heat supply medium of the second-stage heat exchanger 524 are cooled down by themselves; when the first control valve 203 is open and the third control valve 407 is closed, the heat of the molten salt can be transferred to the second-stage power generation medium of the second path of the second-stage heat exchanger 524 and cooled down by itself; when the first control valve 203 is closed and the third control valve 407 is open, the heat of the molten salt can be transferred to the third-stage heat supply medium of the second-stage heat exchanger 524 and cooled down by itself; when the first control valve 203 and the third control valve 407 are closed, the heat of the molten salt is ... second-stage power generation medium of the second path of the second-stage heat exchanger 524 and cooled down by itself; when the first control valve 203 and the third control valve 407 are closed, the heat of the molten salt is transferred to the third-stage heat supply medium of the second-stage heat exchanger 524 and cooled down by itself. Heat may not be transferred to the second-stage power generation medium in the second path of the second-stage heat exchanger 524 or the heating medium in the third path of the second-stage heat exchanger 524; the molten salt flowing out of the first path of the second-stage heat exchanger 524 can flow into the second path of the first preheating heat exchanger 150, and transfer heat to the first-stage power generation medium in the first path of the first preheating heat exchanger 150 to cool it to a medium temperature. The medium-temperature molten salt can be stored in the second-stage temperature molten salt storage tank 502; when the second control valve 504 is open and the first bypass control valve 505 is closed, the second-stage temperature molten salt storage tank 502... The medium-temperature molten salt in the middle can flow into the first path of the third-stage heat exchanger 530 and transfer heat to the third-stage power generation working fluid in the second path of the third-stage heat exchanger 530 to cool down to a low temperature. The low-temperature molten salt can be stored in the third-stage temperature molten salt storage tank 503. The low-temperature molten salt in the third-stage temperature molten salt storage tank 503 can flow into the photothermal molten salt heating device 506 for heating. When the second control valve 504 is closed and the first bypass control valve 505 is open, the medium-temperature molten salt in the second-stage temperature molten salt storage tank 502 can flow into the photothermal molten salt heating device 506 for heating.

[0188] In the first-stage power generation loop 100, the first-stage pump 102 drives the first-stage power generation medium to flow out of the first-stage reservoir 101. The first-stage power generation medium enters the heating box 103 and absorbs the heat released by the electric heater 104 to increase its temperature. The first-stage power generation medium can flow into the first path of the first preheating heat exchanger 150 and absorb the heat released by the molten salt in the second path of the first preheating heat exchanger 150. The first-stage power generation medium can flow into the second path of the first-stage heat exchanger 510 and absorb the heat released by the high-temperature molten salt in the first path of the first-stage heat exchanger 510 to vaporize. The gaseous first-stage power generation medium can enter the first-stage turbine device 105 to perform work, converting the thermal and pressure energy of the first-stage power generation medium into mechanical energy. The first-stage generator 108 converts the mechanical energy generated by the first-stage turbine device 105 into electrical energy and can achieve high-power output. After performing work... The first-stage power generation medium, after condensation, can be stored in the first supply tank 106; the first supply pump 107 can drive the first-stage power generation medium in the first supply tank 106 to flow to the first-stage storage tank 101; the second supply pump 121 can drive the first-stage power generation medium to flow to the second path of the second preheating heat exchanger 120, where the first-stage power generation medium can absorb the heat of the second-stage power generation medium in the first path of the second preheating heat exchanger 120, and the first-stage power generation medium flowing out from the second path of the second preheating heat exchanger 120 can flow to the first-stage storage tank 101; the third supply pump 131 can drive the first-stage power generation medium to flow to the second path of the third preheating heat exchanger 130, where the first-stage power generation medium can absorb the heat of the third-stage power generation medium in the first path of the third preheating heat exchanger 130, and the first-stage power generation medium flowing out from the second path of the third preheating heat exchanger 130 can flow to the first-stage storage tank 101.

[0189] In the second-stage power generation loop 200, when the first control valve 203 is opened, the second-stage pump 202 can drive the second-stage power generation medium to flow out of the second-stage reservoir 201. The second-stage power generation medium can enter the second path of the second-stage heat exchanger 524 and absorb the heat of the molten salt in the first path of the second-stage heat exchanger 524 to increase its temperature, and at least part of the second-stage power generation medium vaporizes. The second-stage power generation medium flows into the first gas-liquid separator 206. The gaseous second-stage power generation medium can enter the second-stage turbine device 204 to do work, so that the thermal energy and pressure energy of the second-stage power generation medium are converted into mechanical energy. The second-stage generator 205 then generates the second-stage power generation medium. The mechanical energy generated by the secondary turbine 204 is converted into electrical energy, and can achieve medium-power output. The second-stage power generation medium after doing work can flow to the first path of the second preheating heat exchanger 120 and release heat to the first-stage power generation medium in the second path of the second preheating heat exchanger 120 to cool it down. The cooled second-stage power generation medium can be stored in the second-stage liquid reservoir 201. When the first control valve 203 is closed, the second-stage power generation medium does not circulate, and the second-stage power generation medium does not absorb heat from the molten salt in the first path of the second-stage heat exchanger 524. The second-stage generator 205 does not output medium-power electricity.

[0190] In the third-stage power generation loop 300, when the second control valve 504 is opened, the third-stage pump 302 can drive the third-stage power generation working fluid to flow out of the third-stage reservoir 301. The third-stage power generation working fluid can enter the second path of the third-stage heat exchanger 530 and absorb the heat of the molten salt in the first path of the third-stage heat exchanger 530 to rise in temperature, and at least part of the third-stage power generation working fluid vaporizes. The third-stage power generation working fluid flows into the second gas-liquid separator 305, and the gaseous third-stage power generation working fluid can enter the third-stage turbine device 303 to do work, so that the thermal energy and pressure energy of the third-stage power generation working fluid are converted into mechanical energy. The motor 304 converts the mechanical energy generated by the third-stage turbine 303 into electrical energy and can achieve low-power output. The third-stage power generation medium after doing work can flow to the first path of the third preheating heat exchanger 130 and release heat to the first-stage power generation medium in the second path of the third preheating heat exchanger 130 to cool it down. The cooled third-stage power generation medium can be stored in the third-stage liquid reservoir 301. When the second control valve 504 is closed, the third-stage power generation medium does not need to absorb the heat of the molten salt in the first path of the third-stage heat exchanger 530, and the third-stage generator 304 does not need to output low-power electricity.

[0191] In the heating circulation loop 400, when the third control valve 407 is open, the heating medium can enter the third path of the second-stage heat exchanger 524 and absorb the heat from the molten salt in the first path of the second-stage heat exchanger 524 to increase its temperature. By controlling the opening and closing of the corresponding stage shut-off valve and the corresponding stage bypass shut-off valve, the heated heating medium can flow into the heat exchange flow path of the corresponding stage heat accumulator. The heating medium in the heat exchange flow path of the corresponding stage heat accumulator can transfer heat to the phase change medium of the corresponding stage heat accumulator. The heating medium flowing out of the heat exchange flow path of the heat accumulator can flow back into the third path of the second-stage heat exchanger 524. When the third control valve 407 is closed, the heating medium does not need to absorb the heat from the molten salt in the first path of the second-stage heat exchanger 524, and the heating medium does not need to transfer heat to the phase change medium of the heat accumulator.

[0192] In the water supply path 600, the water flowing out of the water source 601 can flow to the water storage chamber of the corresponding stage heat accumulator. The water in the water storage chamber of the corresponding stage heat accumulator can absorb the heat from the phase change medium of the corresponding stage heat accumulator and be heated to the temperature of the corresponding stage. The water at the temperature of the corresponding stage can flow to the water supply port of the corresponding stage.

[0193] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0194] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0195] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0196] In the description of this application, "multiple" means two or more.

[0197] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0198] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0199] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0200] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy supply system (10), characterized in that, include: The molten salt circulation loop (500) includes a photothermal molten salt heating device (506), a multi-stage temperature molten salt storage tank connected in series, and a first path of a heat exchanger connected between two adjacent temperature molten salt storage tanks. The multi-stage power generation cycle includes: a corresponding stage liquid storage tank, a corresponding stage pump, a second path of the corresponding stage heat exchanger, and a corresponding stage turbine device. The second path of the heat exchanger is used to absorb heat from the corresponding first path, and the turbine device is powered and coupled to a generator.

2. The energy supply system (10) according to claim 1, characterized in that, The multi-stage temperature molten salt storage tank includes: a first stage to a third stage temperature molten salt storage tank, and the first stage temperature molten salt storage tank (501) and the second stage temperature molten salt storage tank (502) are sequentially connected by a first path of a first stage heat exchanger (510) and a first path of a second stage heat exchanger (524), and the second stage temperature molten salt storage tank (502) and the third stage temperature molten salt storage tank (503) are connected by a first path of a third stage heat exchanger (530); The multi-stage power generation cycle includes: a first to a third stage power generation cycle, wherein the second path of the first stage heat exchanger (510) is connected to the first stage power generation cycle (100), the second path of the second stage heat exchanger (524) is connected to the second stage power generation cycle (200), and the second path of the third stage heat exchanger (530) is connected to the third stage power generation cycle (300).

3. The energy supply system (10) according to claim 2, characterized in that, The first-stage power generation cycle (100) includes: a first-stage liquid storage tank (101), a first-stage pump (102), a second path of the first-stage heat exchanger (510), and a first-stage turbine device (105), wherein the first-stage pump (102) and the second path of the first-stage heat exchanger (510) are connected by a first path of a first preheating heat exchanger (150), and the second path of the first preheating heat exchanger (150) is connected between the first path of the second-stage heat exchanger (524) and the second-stage molten salt storage tank (502).

4. The energy supply system (10) according to claim 3, characterized in that, The first-stage power generation loop (100) further includes a heating box (103), which is connected between the first-stage pump (102) and the first preheating heat exchanger (150) and is equipped with an electric heater (104). And / or, The first-stage power generation cycle loop (100) further includes: a first liquid supply tank (106), which is connected to a first liquid supply pump (107).

5. The energy supply system (10) according to claim 3, characterized in that, The second-stage power generation cycle (200) includes: a second-stage liquid storage tank (201), a second-stage pump (202), a second path of the second-stage heat exchanger (524), and a second-stage turbine device (204); the power supply system (10) also includes: The second liquid supply pump (121) and the second preheating heat exchanger (120) are connected in a first path between the second stage turbine device (204) and the second stage liquid reservoir (201) and in a second path between the second liquid supply pump (121) and the first stage liquid reservoir (101).

6. The energy supply system (10) according to claim 3, characterized in that, The third-stage power generation loop (300) includes: a third-stage liquid storage tank (301), a third-stage pump (302), a second path of the third-stage heat exchanger (530), and a third-stage turbine device (303); the power supply system (10) also includes: The third liquid supply pump (131) and the third preheating heat exchanger (130) are connected in a first path between the third stage turbine device (303) and the third stage liquid reservoir (301), and in a second path between the third liquid supply pump (131) and the first stage liquid reservoir (101).

7. The energy supply system (10) according to claim 2, characterized in that, The second-stage power generation loop (200) is equipped with at least one first control valve (203); And / or, a second control valve (504) is provided between the second-stage temperature molten salt storage tank (502) and the first path of the third-stage heat exchanger (530). The second-stage temperature molten salt storage tank (502) is connected to the photothermal molten salt heating device (506) via a first bypass control valve (505).

8. The energy supply system (10) according to claim 2, characterized in that, Also includes: The heating circulation loop (400) includes a heat exchange flow path of a connected heat accumulator and a third path of a second-stage heat exchanger (524). A water storage chamber and a phase change medium module isolated from the water storage chamber are formed inside the heat accumulator. The heat exchange flow path of the heat accumulator is in contact with the phase change medium module. The inlet of the water storage chamber is used to connect to a water source (601), and the outlet of the water storage chamber is used to connect to a water supply port.

9. The energy supply system (10) according to claim 8, characterized in that, The heat storage device includes multiple stages. The inlet of the water storage chamber corresponding to each of the multiple stages of the heat storage device is used to connect to a water source (601). The outlet of the water storage chamber corresponding to each of the multiple stages of the heat storage device is used to connect to different water supply ports. The heat exchange flow paths of the multiple stages of the heat storage device are connected in series in the heating circulation loop (400), and the phase change temperature of the phase change medium of the multiple stages of the heat storage device is different.

10. The energy supply system (10) according to claim 9, characterized in that, A shut-off valve is provided between the heat exchange flow paths of the heat accumulators in adjacent stages, and the multiple stages of heat accumulators are respectively connected to the third path of the second stage heat exchanger (524) through corresponding bypass shut-off valves.

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