Radiation refrigeration and organic Rankine cycle coupled heat and power cogeneration system and method

Abstract

The invention provides a heat and power cogeneration system and method coupling radiation refrigeration and organic Rankine cycle, and the system comprises a boiler, a turboset, a fused salt circulation loop, an evaporator, a second low-pressure turbine, a condenser, a thermal load circulation loop and a radiation refrigeration circulation loop. Rich waste heat in high-temperature reheat steam is reutilized through the organic Rankine cycle, and the common problem of high-temperature heat energy waste in a traditional system is effectively avoided in the process. And meanwhile, the condensation speed of steam is greatly increased by adding the radiation refrigeration technology, so that the use frequency of a traditional cooling tower and the consumption of cooling water are greatly reduced, the operation cost of the system is reduced, and the pressure on environmental resources is relieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of combined heat and power generation, and in particular relates to a combined heat and power generation system and method coupled with radiative refrigeration and an organic Rankine cycle. Background Art

[0002] Traditional thermal power units face many challenges in the process of combined heat and power generation, such as low energy efficiency, strong dependence on cooling towers, insufficient system flexibility, etc. Especially when operating at low load, the economy and safety of the units are seriously affected, making it difficult to meet the needs of modern energy systems. Specifically: (1) Low energy efficiency: Traditional thermal power units are often designed to maximize power output, but in the combined heat and power mode, the combined production efficiency of heat and electricity is often not high. This is because part of the heat is wasted in the power generation process, while the part used for heating may suffer a large loss due to low conversion efficiency. This efficiency bottleneck leads to low overall energy utilization, which does not meet the current requirements of energy conservation, emission reduction and green development.

[0003] (2) Strong dependence on cooling towers: Traditional thermal power units, especially coal-fired and gas-fired units, generate a lot of heat during operation, which needs to be dissipated through cooling towers. This not only consumes a lot of water resources, but also may cause thermal pollution and ecological impacts. Especially in areas with scarce water resources, the dependence on cooling towers has become a serious limiting factor. In addition, the efficiency of cooling towers will also be affected under extreme weather conditions (such as drought and high temperature), further exacerbating the operating pressure of the units. Summary of the invention

[0004] The object of the present invention is to provide a combined heat and power system and method coupling radiative refrigeration and organic Rankine cycle, which solves the defects of low energy utilization efficiency and strong dependence on cooling towers in the combined heat and power process of traditional thermal power units.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a heat and power cogeneration system coupling radiative refrigeration and organic Rankine cycle, comprising a boiler, a steam turbine unit, a molten salt circulation loop, an evaporator, a second low-pressure steam turbine, a condenser, a heat load circulation loop and a radiative refrigeration circulation loop, wherein: The steam outlet of the boiler is divided into two paths, one of which is connected to the steam inlet of the steam turbine unit, and the other is connected to the steam inlet of the molten salt circulation loop; The exhaust steam at the end of the steam turbine unit enters the steam inlet of the condenser, and the drain outlet of the condenser is divided into two paths, one of which is connected to the inlet of the heat load circulation loop, and the other is connected to the working fluid inlet of the evaporator; the working fluid inlet and outlet of the condenser are respectively connected to the working fluid inlet and outlet of the radiation refrigeration circulation loop; The working medium outlet of the evaporator is connected to the steam inlet of the second low-pressure steam turbine, and the exhaust steam outlet of the second low-pressure steam turbine is connected to the steam inlet of the condenser; The drain outlet of the molten salt circulation loop is connected to the circulating water inlet of the evaporator; the circulating water outlet of the evaporator is connected to the circulating water inlet of the heat load circulation loop; The working fluid inlet and outlet of the molten salt circulation loop are respectively connected to the working fluid inlet and outlet of the heat load circulation loop; The circulating water outlet of the heat load circulation loop is respectively divided into two paths, one of which is connected to the heating user and the other is connected to the steam inlet of the steam turbine unit.

[0006] Preferably, the main steam outlet of the boiler is connected to the steam inlet of the high-pressure steam turbine, and the exhaust steam outlet provided on the high-pressure steam turbine is connected to the low-temperature steam inlet provided on the boiler through a low-temperature reheating pipeline; The reheat steam outlet of the boiler is connected to the steam inlet of the medium-pressure steam turbine, the exhaust steam outlet arranged on the medium-pressure steam turbine is connected to the steam inlet arranged on the first low-pressure steam turbine, and the exhaust steam outlet arranged on the first low-pressure steam turbine is connected to the steam inlet of the condenser.

[0007] Preferably, the molten salt circulation loop comprises a No. 1 molten salt heater, a No. 2 molten salt heater, a hot salt tank and a cold salt tank, wherein: The main steam outlet of the boiler is connected to the steam inlet provided on the No. 1 molten salt heater through the main steam bypass valve, and the drain outlet provided on the No. 1 molten salt heater is connected to the low-temperature steam inlet on the boiler; The working fluid outlet provided on the No. 1 molten salt heater is connected to the working fluid inlet of the heat load circulation loop through the hot salt tank and the hot molten salt pump; The working fluid outlet of the heat load circulation loop is connected to the working fluid inlet of the first molten salt heater through a cold salt tank and a cold molten salt pump; The reheat steam outlet of the boiler is connected to the steam inlet of the No. 2 molten salt heater through a high-temperature reheat steam bypass valve; the drainage outlet of the No. 2 molten salt heater is connected to the circulating water inlet of the evaporator; The working fluid inlet of the No. 2 molten salt heater is connected to the working fluid outlet of the cold salt tank, and the working fluid outlet of the No. 2 molten salt heater is connected to the working fluid inlet of the hot salt tank.

[0008] Preferably, the main steam outlet of the boiler is connected to the first molten salt heater through a main steam bypass valve.

[0009] Preferably, the reheat steam outlet of the boiler is connected to the second molten salt heater through a high-temperature reheat steam bypass valve.

[0010] Preferably, the heat load circulation loop comprises a No. 1 heat exchanger, a No. 2 heat exchanger and a phase change heat storage device, wherein: The circulating water outlet provided on the evaporator is connected to the low-temperature steam inlet of the phase-change heat storage device, and the high-temperature circulating water outlet provided on the phase-change heat storage device is divided into two paths, one path is connected to the heating user, and the other path is connected to the circulating water inlet of the first heat exchanger; The working fluid inlet of the phase change heat storage device is connected to the drain outlet of the condenser through the deaerator, and the working fluid outlet of the phase change heat storage device is connected to the deaerator; The circulating water outlet of the first heat exchanger is divided into two paths, one path is connected to the heating user, and the other path is connected to the circulating water inlet of the second heat exchanger; The working fluid inlet of the first heat exchanger is connected to the working fluid outlet of the second heat exchanger, and the working fluid outlet of the first heat exchanger is connected to the cold salt tank; The circulating water outlet of the No. 2 heat exchanger is connected to the steam inlet of the steam turbine unit, and the working medium inlet of the No. 2 heat exchanger is connected to the hot salt tank.

[0011] Preferably, the circulating water outlet of the first heat exchanger is connected to the heating user through a first heating flow regulating valve.

[0012] Preferably, the high-temperature circulating water outlet provided on the phase-change heat storage device is connected to the heating user through a second heating flow regulating valve.

[0013] Preferably, the radiation refrigeration cycle includes a radiation refrigeration device and a cooling tower, wherein: The working fluid outlet of the condenser is divided into two paths, one path is connected to the cooling tower, and the other path is connected to the radiation refrigeration device. The working fluid outlets of the cooling path and the radiation refrigeration device are both connected to the working fluid inlet of the condenser.

[0014] A heat and power cogeneration method coupling radiative cooling and organic Rankine cycle, comprising the following steps: The steam from the boiler enters the steam turbine unit to generate power, and the exhaust steam formed at the end of the steam process enters the condenser to exchange heat with the working medium from the radiation refrigeration cycle process. After the exhaust steam undergoes heat exchange, part of the low-temperature water formed enters the heat load circulation loop, and the other part enters the evaporator for heat exchange; The high-temperature working medium formed by heat exchange from the working medium in the radiation refrigeration cycle process enters the radiation refrigeration cycle for cooling, and then enters the condenser for further circulation; The exhaust steam entering the evaporator undergoes heat exchange to form low-temperature steam, which enters the second low-pressure steam turbine to generate power, and the exhaust steam enters the condenser; The steam from the boiler enters the molten salt circulation loop to exchange heat with the low-temperature working medium. After the heat exchange, the steam forms low-temperature steam and enters the evaporator to exchange heat with the exhaust steam flowing out of the condenser. After that, the low-temperature steam is cooled and enters the heat load circulation loop. After the low-temperature working medium undergoes heat exchange, it forms high-temperature working medium and enters the heat load circulation loop. The high-temperature working medium entering the heat load circulation loop exchanges heat with the cooled low-temperature steam flowing out of the evaporator, wherein the high-temperature working medium forms a low-temperature working medium after heat exchange and enters the molten salt circulation loop, and the cooled low-temperature steam forms a high-temperature steam after heat exchange, part of which is used to provide heating to users, and part of which enters the steam turbine unit to generate power.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a combined heat and power system that couples radiative refrigeration and an organic Rankine cycle. By coupling radiative refrigeration technology with advanced organic Rankine cycle technology, the system achieves efficient, flexible and economical operation compared to traditional combined heat and power systems of thermal power units. This design not only significantly improves the comprehensive utilization efficiency of energy, but also greatly enhances the system's adaptability to different load changes and diversified energy demands. Specifically, the present invention uses the organic Rankine cycle to reutilize the abundant waste heat in the high-temperature reheated steam. This process effectively avoids the common high-temperature heat energy waste problem in traditional systems. At the same time, the addition of radiative refrigeration technology greatly accelerates the condensation rate of steam, thereby greatly reducing the frequency of use of traditional cooling towers and the consumption of cooling water. This change not only reduces the operating cost of the system, but also reduces the pressure on environmental resources.

[0016] Furthermore, the present invention realizes the regulation of the flow of main steam and high-temperature reheat steam by adopting a regulating valve. This high degree of flexibility and adaptability provides a strong guarantee for the stable operation and efficient heating of the cogeneration system of the thermal power unit.

[0017] In summary, the present invention simultaneously extracts main steam and high-temperature reheat steam, and only uses their sensible heat to heat the cold molten salt. After the pressure drops, it is merged into the high-pressure cylinder exhaust steam and the waste heat is reused through the organic Rankine cycle. In this way, the flow rates of feed water and low-temperature reheat steam entering the boiler remain unchanged, the steam parameters are matched, and there is no effect on the combustion of the boiler, which weakens the original rigid connection of "machine-boiler coupling" and realizes low-load deep peak regulation of the steam turbine and full-load denitrification operation of the boiler during the heat storage process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a combined heat and power system that couples radiative cooling and an organic Rankine cycle according to the present invention; Among them, 1. Boiler, 2. Main steam bypass valve, 3. High-temperature reheat steam bypass valve, 4. No. 1 molten salt heater, 5. No. 2 molten salt heater, 6. Cold molten salt pump, 7. Cold salt tank, 8. No. 1 heat exchanger, 9. No. 2 heat exchanger, 10. Hot salt tank, 11. Hot molten salt pump, 12. Deaerator pump, 13. First heating flow regulating valve, 14. Second heating flow regulating valve, 15. Phase change heat storage device, 16. Condenser, 17. Evaporator, 18. Working fluid pump, 19. Cooling tower, 20. Radiant refrigeration device, 21. First low-pressure steam turbine, 22. Deaerator, 23. Medium-pressure steam turbine, 24. High-pressure steam turbine, 25. Second low-pressure steam turbine. DETAILED DESCRIPTION

[0019] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0020] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0021] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0022] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0023] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0024] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0025] Example 1 like Figure 1 As shown, this embodiment provides a heat and power cogeneration system coupling radiative refrigeration and organic Rankine cycle, including a boiler 1, a first molten salt heater 4, a second molten salt heater 5, a cold salt tank 7, a first heat exchanger 8, a second heat exchanger 9, a hot salt tank 10, a phase change heat storage device 15, a condenser 16, an evaporator 17, a cooling tower 19, a radiative refrigeration device 20, a high-pressure steam turbine, a medium-pressure steam turbine, a first low-pressure steam turbine and a deaerator, wherein: The main steam outlet of the boiler 1 is connected to the steam inlet of the high-pressure steam turbine, and the exhaust steam outlet of the high-pressure steam turbine is connected to the low-temperature steam inlet of the boiler 1 through a low-temperature reheat pipe.

[0026] The reheat steam outlet arranged on the boiler 1 is connected to the steam inlet of the medium-pressure steam turbine, the exhaust steam outlet arranged on the medium-pressure steam turbine is connected to the steam inlet arranged on the first low-pressure steam turbine, the exhaust steam outlet arranged on the first low-pressure steam turbine is connected to the steam inlet of the condenser 16, and the drain outlet of the condenser 16 is connected to the deaerator 22.

[0027] The working fluid outlets provided on the condenser 16 are respectively divided into two paths, one of which is connected to the working fluid inlet provided on the condenser 16 through the radiation refrigeration device, and the other is connected to the working fluid inlet provided on the condenser 16 through the cooling tower 19 .

[0028] The main steam outlet of the boiler 1 is connected to the steam inlet provided on the No. 1 molten salt heater 4 through the main steam bypass valve 2 , and the drain outlet provided on the No. 1 molten salt heater 4 is connected to the low-temperature steam inlet on the boiler 1 .

[0029] The working fluid outlet arranged on the No. 1 molten salt heater 4 is connected to the working fluid inlet of the No. 2 heat exchanger 9 through the hot salt tank 10 and the hot molten salt pump 11, and the working fluid outlet of the No. 2 heat exchanger 9 is connected to the working fluid inlet of the No. 1 molten salt heater 4 through the No. 1 heat exchanger 8, the cold salt tank 7 and the cold molten salt pump 6.

[0030] The circulating water outlet arranged on the No. 2 heat exchanger 9 is connected to the reheat steam inlet of the medium-pressure turbine; the circulating water inlet arranged on the No. 2 heat exchanger 9 is connected to the circulating water outlet arranged on the No. 1 heat exchanger 8.

[0031] The circulating water inlet on the first heat exchanger is connected to the high-temperature circulating water outlet of the phase change heat storage device.

[0032] The circulating water outlet arranged on the first heat exchanger 8 is also connected to the water supply inlet of the heating user through the first heating flow regulating valve 13.

[0033] The reheat steam outlet of the boiler 1 is connected to the steam inlet of the second molten salt heater 5 through the high-temperature reheat steam bypass valve 3. The drainage outlet of the second molten salt heater 5 is connected to the circulating water inlet of the evaporator 17.

[0034] The working fluid inlet of the second molten salt heater 5 is connected to the working fluid outlet of the cold salt tank 7 , and the working fluid outlet of the second molten salt heater 5 is connected to the working fluid inlet of the hot salt tank 10 .

[0035] The circulating water outlet provided on the evaporator 17 is connected to the circulating water inlet of the phase change heat storage device 15 .

[0036] The working medium outlet arranged on the evaporator 17 is connected to the steam inlet of the second low-pressure steam turbine 25 , and the exhaust steam outlet of the second low-pressure steam turbine 25 is connected to the working medium inlet of the evaporator 17 through the condenser 16 and the working medium pump 18 .

[0037] The working medium outlet arranged on the phase change heat storage device 15 is connected to the deaerator 22 , and the drainage outlet of the deaerator 22 is connected to the working medium inlet of the phase change heat storage device through the deaerator water pump 12 .

[0038] The high-temperature circulating water outlet arranged on the phase-change heat storage device 15 is divided into two paths, one of which is connected to the heating user through the second heating flow regulating valve 14, and the other is connected to the circulating water inlet of the first heat exchanger 8.

[0039] Example 2 Based on Example 1, this example provides a heat and power cogeneration system that couples radiative refrigeration and an organic Rankine cycle. The radiative refrigeration device includes a dielectric / polymer composite film material with a three-dimensional porous structure, which can effectively improve the refrigeration effect. At the same time, the material also has excellent mechanical properties and self-cleaning properties.

[0040] The phase change heat storage device uses paraffin as the heat storage material and adds expanded graphite as a thermal conductivity enhancer to form a composite phase change material, which effectively improves the thermal conductivity. It is simple to prepare and low in price. The temperature fluctuation during the phase change process is small, and a stable heat source can be provided.

[0041] Example 3 This embodiment provides a combined heat and power method for coupling radiative cooling and organic Rankine cycle, comprising the following steps: The main steam generated by the boiler 1 enters the steam inlet of the high-pressure steam turbine 24 to drive the high-pressure steam turbine 24 to rotate at high speed, thereby driving the generator to convert into electrical energy. In this process, the main steam releases a large amount of heat energy and reduces pressure, and then flows back to the boiler 1 through the low-temperature reheat pipe for reheating. This process not only improves the thermal efficiency of the steam, but also ensures that the steam is maintained at a suitable high temperature and high pressure state before entering the subsequent steam turbine.

[0042] The reheat steam outlet of the boiler 1 is connected to the steam inlet of the medium-pressure steam turbine 23, realizing seamless energy transfer. The medium-pressure steam turbine 23 uses the residual energy of the steam to work and further drives the generator to generate electricity.

[0043] Subsequently, the steam pressure and temperature are further reduced, and the steam flows out from the outlet of the medium-pressure steam turbine, seamlessly transitioning to the steam inlet of the first low-pressure steam turbine 21, forming a coherent and efficient energy conversion chain. The high, medium and low-pressure steam turbines work together in this system to complete the main power generation task of the thermal power plant and ensure the stability and continuity of power output.

[0044] At the end of the steam process, the exhaust steam at the outlet of the first low-pressure steam turbine 23 is directed to the condenser 16 for condensation. In order to reduce the dependence on the traditional cooling tower 19 and improve energy efficiency, a radiation refrigeration device 20 is added between the condenser 16 and the cooling tower 19. This structure can effectively utilize the radiation cooling effect of the natural environment, accelerate the condensation process of steam, and reduce energy consumption and operating costs. The water formed after condensation is collected and flows into the deaerator 22, which is deoxygenated to remove the oxygen dissolved in the water, prevent equipment corrosion, ensure the purity of water quality, and prepare for subsequent recycling.

[0045] The main steam of boiler 1 also enters the No. 1 molten salt heater 4 to exchange heat with the working fluid in the No. 1 molten salt heater. The cooled steam enters boiler 1 again to be heated and pressurized; the heated working fluid enters the hot salt tank 10 for storage.

[0046] The working fluid stored in the hot salt tank 10 enters the No. 2 heat exchanger 9 through the hot molten salt pump 11 to exchange heat with the circulating water. The heated circulating water forms steam and is mixed with the reheated steam in the boiler 1 to enter the medium-pressure steam turbine 23 to generate power; the cooled working fluid enters the No. 1 heat exchanger 8 to exchange heat with the circulating water again. A part of the heated circulating water enters the No. 2 heat exchanger 9, and the other part is used to provide heat to users; the working fluid cooled by the No. 1 heat exchanger 8 is stored in the cold salt tank 7.

[0047] The working fluid stored in the cold salt tank 7 enters the No. 2 molten salt heater 5 through the cold molten salt pump 6 to exchange heat with the reheated steam of the boiler 1. The heated working fluid enters the hot salt tank 10 for storage. The cooled circulating water passes through the evaporator 17 for heat exchange. The heated steam enters the second low-pressure steam turbine 25 to generate power. The steam cooled by the evaporator 17 enters the phase change heat storage device 15 to exchange heat with the low-temperature water flowing out of the deaerator 22. The cooled steam forms low-temperature water after heat exchange and is circulated in the deaerator 22. The low-temperature water flowing out of the deaerator 11 forms heated low-temperature water after heat exchange and is divided into two paths, one path enters the No. 1 heat exchanger 8, and the other path enters the heating user.

[0048] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A combined heat and power system coupling radiative cooling and organic Rankine cycle, characterized in that: It includes boiler, steam turbine unit, molten salt circulation loop, evaporator, second low-pressure steam turbine, condenser, heat load circulation loop and radiation refrigeration circulation loop, among which: The steam outlet of the boiler is divided into two paths, one of which is connected to the steam inlet of the steam turbine unit, and the other is connected to the steam inlet of the molten salt circulation loop; The exhaust steam at the end of the steam turbine unit enters the steam inlet of the condenser, and the drain outlet of the condenser is divided into two paths, one of which is connected to the inlet of the heat load circulation loop, and the other is connected to the working fluid inlet of the evaporator; the working fluid inlet and outlet of the condenser are respectively connected to the working fluid inlet and outlet of the radiation refrigeration circulation loop; The working medium outlet of the evaporator is connected to the steam inlet of the second low-pressure steam turbine, and the exhaust steam outlet of the second low-pressure steam turbine is connected to the steam inlet of the condenser; The drain outlet of the molten salt circulation loop is connected to the circulating water inlet of the evaporator; the circulating water outlet of the evaporator is connected to the circulating water inlet of the heat load circulation loop; The working fluid inlet and outlet of the molten salt circulation loop are respectively connected to the working fluid inlet and outlet of the heat load circulation loop; The circulating water outlet of the heat load circulation loop is respectively divided into two paths, one of which is connected to the heating user and the other is connected to the steam inlet of the steam turbine unit.

2. A combined heat and power system coupling radiative cooling and organic Rankine cycle according to claim 1, characterized in that: The main steam outlet of the boiler is connected to the steam inlet of the high-pressure steam turbine, and the exhaust steam outlet provided on the high-pressure steam turbine is connected to the low-temperature steam inlet provided on the boiler through a low-temperature reheating pipeline; The reheat steam outlet of the boiler is connected to the steam inlet of the medium-pressure steam turbine, the exhaust steam outlet arranged on the medium-pressure steam turbine is connected to the steam inlet arranged on the first low-pressure steam turbine, and the exhaust steam outlet arranged on the first low-pressure steam turbine is connected to the steam inlet of the condenser.

3. The combined heat and power system of coupling radiative cooling and organic Rankine cycle according to claim 1, characterized in that: The molten salt circulation loop includes a No. 1 molten salt heater, a No. 2 molten salt heater, a hot salt tank and a cold salt tank, wherein: The main steam outlet of the boiler is connected to the steam inlet provided on the No. 1 molten salt heater through the main steam bypass valve, and the drain outlet provided on the No. 1 molten salt heater is connected to the low-temperature steam inlet on the boiler; The working fluid outlet provided on the No. 1 molten salt heater is connected to the working fluid inlet of the heat load circulation loop through the hot salt tank and the hot molten salt pump; The working fluid outlet of the heat load circulation loop is connected to the working fluid inlet of the first molten salt heater through a cold salt tank and a cold molten salt pump; The reheat steam outlet of the boiler is connected to the steam inlet of the No. 2 molten salt heater through a high-temperature reheat steam bypass valve; the drainage outlet of the No. 2 molten salt heater is connected to the circulating water inlet of the evaporator; The working fluid inlet of the No. 2 molten salt heater is connected to the working fluid outlet of the cold salt tank, and the working fluid outlet of the No. 2 molten salt heater is connected to the working fluid inlet of the hot salt tank.

4. A combined heat and power system coupling radiative cooling and organic Rankine cycle according to claim 3, characterized in that: The main steam outlet of the boiler is connected to the No. 1 molten salt heater through a main steam bypass valve.

5. The combined heat and power system of coupling radiative cooling and organic Rankine cycle according to claim 3, characterized in that: The reheat steam outlet of the boiler is connected to the No. 2 molten salt heater through a high-temperature reheat steam bypass valve.

6. The combined heat and power system of coupling radiative cooling and organic Rankine cycle according to claim 1, characterized in that: The heat load circulation loop includes a No. 1 heat exchanger, a No. 2 heat exchanger and a phase change heat storage device, wherein: The circulating water outlet provided on the evaporator is connected to the low-temperature steam inlet of the phase-change heat storage device, and the high-temperature circulating water outlet provided on the phase-change heat storage device is divided into two paths, one path is connected to the heating user, and the other path is connected to the circulating water inlet of the first heat exchanger; The working fluid inlet of the phase change heat storage device is connected to the drain outlet of the condenser through the deaerator, and the working fluid outlet of the phase change heat storage device is connected to the deaerator; The circulating water outlet of the first heat exchanger is divided into two paths, one path is connected to the heating user, and the other path is connected to the circulating water inlet of the second heat exchanger; The working fluid inlet of the first heat exchanger is connected to the working fluid outlet of the second heat exchanger, and the working fluid outlet of the first heat exchanger is connected to the cold salt tank; The circulating water outlet of the No. 2 heat exchanger is connected to the steam inlet of the steam turbine unit, and the working medium inlet of the No. 2 heat exchanger is connected to the hot salt tank.

7. The combined heat and power system of coupling radiative cooling and organic Rankine cycle according to claim 1, characterized in that: The circulating water outlet of the first heat exchanger is connected to the heating user through the first heating flow regulating valve.

8. The combined heat and power system of coupling radiative cooling and organic Rankine cycle according to claim 1, characterized in that: The high-temperature circulating water outlet provided on the phase-change heat storage device is connected to the heating user through the second heating flow regulating valve.

9. The combined heat and power system of coupling radiative cooling and organic Rankine cycle according to claim 1, characterized in that: The radiation refrigeration cycle includes a radiation refrigeration device and a cooling tower, wherein: The working fluid outlet of the condenser is divided into two paths, one path is connected to the cooling tower, and the other path is connected to the radiation refrigeration device. The working fluid outlets of the cooling path and the radiation refrigeration device are both connected to the working fluid inlet of the condenser.

10. A combined heat and power method coupling radiative cooling and organic Rankine cycle, characterized in that: The following steps are involved: The steam from the boiler enters the steam turbine unit to generate power, and the exhaust steam formed at the end of the steam process enters the condenser to exchange heat with the working medium from the radiation refrigeration cycle process. After the exhaust steam undergoes heat exchange, part of the low-temperature water formed enters the heat load circulation loop, and the other part enters the evaporator for heat exchange; The high-temperature working medium formed by heat exchange from the working medium in the radiation refrigeration cycle process enters the radiation refrigeration cycle for cooling, and then enters the condenser for further circulation; The exhaust steam entering the evaporator undergoes heat exchange to form low-temperature steam, which enters the second low-pressure steam turbine to generate power, and the exhaust steam enters the condenser; The steam from the boiler enters the molten salt circulation loop to exchange heat with the low-temperature working medium. After the heat exchange, the steam forms low-temperature steam and enters the evaporator to exchange heat with the exhaust steam flowing out of the condenser. After that, the low-temperature steam is cooled and enters the heat load circulation loop. After the low-temperature working medium undergoes heat exchange, it forms high-temperature working medium and enters the heat load circulation loop. The high-temperature working medium entering the heat load circulation loop exchanges heat with the cooled low-temperature steam flowing out of the evaporator, wherein the high-temperature working medium forms a low-temperature working medium after heat exchange and enters the molten salt circulation loop, and the cooled low-temperature steam forms a high-temperature steam after heat exchange, part of which is used to provide heating to users, and part of which enters the steam turbine unit to generate power.

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