High-temperature compression supercritical carbon dioxide cycle combined cycle system and operation method

Abstract

The application belongs to the technical field of power generation, and discloses a high-temperature compression supercritical carbon dioxide cycle cogeneration system and a running method thereof. The system comprises a main compressor, a regenerator unit, a turbine unit, a re-compressor, a boiler and a steam supply unit. The outlet of the main compressor is connected with the regenerator unit, the regenerator unit is connected to the boiler, and the boiler is connected with the turbine unit. The regenerator unit is further connected with the re-compressor and the steam supply unit. The re-compressor is connected with the inlet of the main compressor, and the steam supply unit is used for outputting stable steam supply. The system of the application realizes a large temperature rise by compressing high-temperature regenerator hot-side low-pressure medium-temperature carbon dioxide working medium, and heats water to steam meeting the industrial demand, so that the unit has an industrial steam supply function. Meanwhile, the cold water used for producing industrial steam is preheated by a precooler first, and part of the cold-end waste heat can be recovered, so as to reduce energy loss and improve the energy utilization efficiency of the system.

Description

Technical Field

[0001] This invention relates to the field of power generation technology, specifically to a high-temperature compression supercritical carbon dioxide cycle cogeneration system and its operation method. Background Technology

[0002] Supercritical carbon dioxide power cycles possess advantages such as high efficiency, flexibility, and compactness, and have broad application prospects in coal-fired power generation, nuclear power, solar thermal power generation, and waste heat power generation. In recent years, this technology has developed rapidly, moving from theoretical research to experimental verification, marking a significant step closer to industrial application. However, current research on supercritical carbon dioxide cycle technology focuses primarily on improving power generation efficiency, system compactness, and flexible control, lacking research on production technologies for other energy products besides electricity. Furthermore, single-product electricity production cannot meet the diversified energy demands of users. Residents, hospitals, office buildings, industrial parks, and other users have diverse energy needs, requiring not only electricity but also steam for sterilization, disinfection, drying, and heating. Therefore, supercritical carbon dioxide power cycle combined electricity and industrial steam generation technology needs further development to meet user needs. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature compression supercritical carbon dioxide cycle cogeneration system and its operation method, so as to solve the problem that the existing supercritical carbon dioxide cycle technology is too limited and cannot meet the steam supply demand.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a high-temperature compression supercritical carbon dioxide cycle cogeneration system, comprising a main compressor, a regenerator unit, a turbine unit, a recompressor, a boiler, and a steam supply unit; the outlet of the main compressor is connected to the regenerator unit, the regenerator unit is connected to the boiler, and the boiler is connected to the turbine unit; the regenerator unit is also connected to the recompressor and the steam supply unit, the recompressor is connected to the inlet of the main compressor, and the steam supply unit is used to produce stable steam.

[0006] Furthermore, the regenerator unit includes a low-temperature regenerator and a high-temperature regenerator. The outlet of the main compressor is connected to the cold-side inlet of the low-temperature regenerator, the cold-side outlet of the low-temperature regenerator is connected to the cold-side inlet of the high-temperature regenerator, and the cold-side outlet of the high-temperature regenerator is connected to the boiler feed gas inlet.

[0007] Furthermore, the turbine unit includes a low-pressure turbine and a high-pressure turbine. The boiler main gas outlet is connected to the high-pressure turbine inlet, the high-pressure turbine outlet is connected to the boiler reheat inlet, the boiler reheat outlet is connected to the low-pressure turbine inlet, the low-pressure turbine outlet is connected to the hot-side inlet of the high-temperature regenerator, and the hot-side outlet of the high-temperature regenerator is connected to the hot-side inlet of the low-temperature regenerator.

[0008] Furthermore, the hot-side outlet of the low-temperature regenerator is connected to the inlet of the precooler, and the outlet of the precooler is connected to the inlet of the main compressor; the hot-side outlet of the low-temperature regenerator is connected to the inlet of the re-compressor, and the outlet of the re-compressor is connected to the cold-side inlet of the high-temperature regenerator.

[0009] Furthermore, the steam supply unit includes a chilled water preheater, a steam generator, a high-temperature compressor, and a buffer tank. The hot-side outlet of the high-temperature regenerator is connected to the inlet of the high-temperature compressor, the outlet of the high-temperature compressor is connected to the hot-side inlet of the steam generator, and the hot-side outlet of the steam generator is connected to the inlet of the buffer tank. The hot-side outlet of the low-temperature regenerator is connected to the hot-side inlet of the chilled water preheater, the hot-side outlet of the chilled water preheater is connected to the inlet of the precooler, and the cold-side outlet of the chilled water preheater is connected to the cold-side inlet of the steam generator.

[0010] Furthermore, the cold-side outlet of the low-temperature regenerator is connected to the cold-side inlet of the high-temperature regenerator via a buffer tank, and the compressor outlet is connected to the cold-side inlet of the high-temperature regenerator via a buffer tank.

[0011] Furthermore, the buffer tank has three inlets, which are connected to the outlet of the recompressor, the cold-side outlet of the cryogenic regenerator, and the hot-side outlet of the steam generator, respectively.

[0012] Furthermore, the system's circulating working fluid is supercritical carbon dioxide.

[0013] Furthermore, the outlet temperature of the high-temperature compressor is 380~450℃; the industrial steam temperature at the cold side outlet of the steam generator is 270~320℃.

[0014] Secondly, the present invention provides an operation method for a high-temperature compression supercritical carbon dioxide cycle cogeneration system, comprising the following steps:

[0015] Supercritical carbon dioxide working fluid is compressed by the main compressor and then absorbs heat sequentially in the low-temperature regenerator, high-temperature regenerator, and boiler to become a high-temperature, high-pressure working fluid. It then enters the high-pressure turbine to perform work. The exhaust gas is reheated in the boiler and enters the low-pressure turbine to perform work. The exhaust gas first releases heat in the high-temperature regenerator, and then the outlet working fluid is divided into two paths. One path continues to release heat in the low-temperature regenerator, while the other path is divided into three paths. One path is cooled by the precooler and enters the main compressor to start the recirculation process. The other path is compressed by the recompressor and enters the buffer tank to react with the working fluid from the low-temperature regenerator. The working fluids from the cold side outlet of the heat exchanger converge, and the third working fluid enters the cold water preheater to preheat the cold water used for steam production. After releasing heat, it enters the precooler. The other working fluid from the outlet of the high-temperature regenerator enters the high-temperature compressor for compression and temperature increase, then enters the steam generator to release heat, and then enters the buffer tank. The cold water absorbs heat in the cold water preheater and steam generator in sequence, becoming high-temperature steam that meets industrial requirements, and then supplies it to users. A portion of the output power from the high-pressure turbine and the low-pressure turbine drives the main compressor, the re-compressor, and the high-temperature compressor, while the remainder is used for power generation.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] This invention provides a high-temperature compression supercritical carbon dioxide cycle cogeneration system and its operation method. Through innovative thermodynamic cycle design and working fluid management process, this system achieves efficient cogeneration of electricity and industrial steam. The following is a detailed analysis and technical effects of the system:

[0018] This system consists of a power generation system and a steam supply system. The power generation system converts thermal energy into electrical energy by compressing supercritical carbon dioxide working fluid and circulating it in multiple thermal devices. The steam supply system uses the waste heat from the power generation system to heat water to produce steam that meets industrial needs, thus achieving combined heat and power generation.

[0019] After being compressed by the main compressor, the supercritical carbon dioxide working fluid absorbs heat in the low-temperature regenerator, high-temperature regenerator and boiler in sequence, becoming a high-temperature and high-pressure working fluid.

[0020] High-temperature and high-pressure working fluid enters the high-pressure turbine and low-pressure turbine to do work, driving the generator to generate electricity.

[0021] The gas discharged from the turbine undergoes reheating and regeneration processes to recover heat energy and reduce energy loss.

[0022] The working fluid is drawn from the hot side outlet of the high-temperature regenerator, compressed and heated by the high-temperature compressor, and then enters the steam generator to release heat and produce industrial steam.

[0023] The cold water used to produce industrial steam is first preheated by a precooler to recover some of the waste heat from the cold end and reduce energy loss.

[0024] The preheated cold water absorbs heat further in the steam generator, eventually becoming high-temperature steam that meets industrial needs and is supplied to users.

[0025] High-efficiency energy conversion: Through supercritical carbon dioxide cycle, the high-efficiency conversion of thermal energy into electrical energy is achieved; at the same time, the waste heat of the power generation system is used to produce industrial steam, which improves the overall energy utilization efficiency.

[0026] Multi-stage energy utilization: The low-temperature and high-temperature regenerators in the system enable multi-stage energy utilization, reducing energy loss.

[0027] Combined power generation: This system simultaneously generates electricity and industrial steam, meeting both user needs and improving the system's economy and practicality.

[0028] Reduced energy loss: By extracting the working fluid to heat and produce industrial steam, the working fluid flow rate of the precooler is reduced, and some of the waste heat at the cold end is recovered by using the cold water preheater, which significantly reduces energy loss and improves the system's energy utilization efficiency.

[0029] System stability: The method of extracting the working fluid from the hot side outlet of the high-temperature regenerator and returning it to the cold side inlet of the high-temperature regenerator maintains the original distribution ratio of the working fluid flow on both sides of the regenerator, has little impact on the boiler inlet temperature, and is conducive to the safe and stable operation of the boiler system.

[0030] System reliability: Industrial steam production systems are simple, require fewer devices, and are safer, more reliable, and more flexible in operation, reducing investment costs and maintenance difficulties.

[0031] Heating function: This system is not only suitable for the production of industrial steam, but also for the heating field, and has a wide range of application prospects.

[0032] In summary, the high-temperature compression supercritical carbon dioxide cycle cogeneration system and operation method provided by this invention have the technical advantages of high-efficiency energy conversion, multi-stage energy utilization, cogeneration, reduced energy loss, good system stability, high reliability, strong flexibility, and low investment. It can meet users' needs for electricity and industrial steam and has broad market prospects and application value. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a high-temperature compression supercritical carbon dioxide cycle cogeneration system according to the present invention.

[0034] in:

[0035] 1-Main compressor, 2-Low temperature regenerator, 3-High temperature regenerator, 4-Boiler, 5-High pressure turbine, 6-Low pressure turbine, 7-Precooler, 8-Recompressor, 9-Cold water preheater, 10-Steam generator, 11-High temperature compressor, 12-Buffer tank. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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 limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1, please refer to Figure 1 A high-temperature compression supercritical carbon dioxide cycle cogeneration system is characterized by comprising a main compressor 1, a regenerator unit, a turbine unit, a recompressor 8, a boiler 4, and a steam supply unit; the outlet of the main compressor 1 is connected to the regenerator unit, the regenerator unit is connected to the boiler 4, and the boiler 4 is connected to the turbine unit; the regenerator unit is also connected to the recompressor 8 and the steam supply unit, the recompressor 8 is connected to the inlet of the main compressor 1, and the steam supply unit is used to produce stable steam.

[0040] This system consists of a power generation system and a steam supply system. The power generation system converts thermal energy into electrical energy by compressing supercritical carbon dioxide working fluid and circulating it in multiple thermal devices. The steam supply system uses the waste heat from the power generation system to heat water to produce steam that meets industrial needs, thus achieving combined heat and power generation.

[0041] After being compressed by the main compressor, the supercritical carbon dioxide working fluid absorbs heat in the low-temperature regenerator, high-temperature regenerator and boiler in sequence, becoming a high-temperature and high-pressure working fluid.

[0042] High-temperature and high-pressure working fluid enters the high-pressure turbine and low-pressure turbine to do work, driving the generator to generate electricity.

[0043] The gas discharged from the turbine undergoes reheating and regeneration processes to recover heat energy and reduce energy loss.

[0044] Example 2: A high-temperature compression supercritical carbon dioxide cycle cogeneration system, comprising a power generation system and a steam supply system, wherein...

[0045] The power generation system includes a main compressor 1, a low-temperature regenerator 2, a high-temperature regenerator 3, a boiler 4, a high-pressure turbine 5, a low-pressure turbine 6, a precooler 7, and a recompressor 8. The outlet of the main compressor 1 is connected to the cold-side inlet of the low-temperature regenerator 2. The cold-side outlet of the low-temperature regenerator 2 is connected to the cold-side inlet of the high-temperature regenerator 3 through the buffer tank 12. The cold-side outlet of the high-temperature regenerator 3 is connected to the gas inlet of the boiler 4. The main gas outlet of the boiler 4 is connected to the inlet of the high-pressure turbine 5. The outlet of the high-pressure turbine 5 is connected to the reheat inlet of the boiler 4. The reheat outlet of the boiler 4 is connected to the inlet of the low-pressure turbine 6. The outlet of the low-pressure turbine 6 is connected to the hot-side inlet of the high-temperature regenerator 3. The hot-side outlet of the high-temperature regenerator 3 is connected to the hot-side inlet of the low-temperature regenerator 2. The hot-side outlet of the low-temperature regenerator 2 is connected to the inlet of the precooler 7. The outlet of the precooler 7 is connected to the inlet of the main compressor 1. The hot-side outlet of the low-temperature regenerator 2 is connected to the inlet of the recompressor 8. The outlet of the recompressor 8 is connected to the cold-side inlet of the high-temperature regenerator 3 through the buffer tank 12.

[0046] The steam supply system includes a chilled water preheater 9, a steam generator 10, a high-temperature compressor 11, and a buffer tank 12. The hot-side outlet of the high-temperature regenerator 3 is connected to the inlet of the high-temperature compressor 11; the outlet of the high-temperature compressor 11 is connected to the hot-side inlet of the steam generator 10; and the hot-side outlet of the steam generator 10 is connected to the inlet of the buffer tank 12. The hot-side outlet of the low-temperature regenerator 2 is connected to the hot-side inlet of the chilled water preheater 9; the hot-side outlet of the chilled water preheater 9 is connected to the inlet of the precooler 7; and the cold-side outlet of the chilled water preheater 9 is connected to the cold-side inlet of the steam generator 10.

[0047] The buffer tank 12 has three inlets, which are connected to the outlet of the recompressor 8, the cold side outlet of the low-temperature regenerator 2, and the hot side outlet of the steam generator 10, respectively, to play a role in equalizing pressure and temperature for mixing multiple working fluids.

[0048] The working fluid in the power generation system is supercritical carbon dioxide.

[0049] The outlet temperature of the high-temperature compressor 11 is 380~450℃;

[0050] The industrial steam temperature at the cold side outlet of the steam generator 10 is 270~320℃;

[0051] This system combines power generation and steam supply functions, using supercritical carbon dioxide as the working medium to improve energy conversion efficiency and reduce environmental emissions. The following is a technical effect analysis of this solution: Utilizing the characteristics of supercritical carbon dioxide, the system can operate at higher temperatures and pressures, thereby improving energy conversion efficiency.

[0052] The Rankine cycle, consisting of the main compressor 1, high-temperature regenerator 3, boiler 4, and turbines 5 and 6, can effectively convert thermal energy into mechanical energy, and then into electrical energy through a generator.

[0053] The design of the low-temperature regenerator 2 and the high-temperature regenerator 3 enables the system to effectively recover and utilize thermal energy, reducing energy loss.

[0054] The reheat design of boiler 4 further improves thermal energy utilization and increases the overall efficiency of the system.

[0055] Combined power generation:

[0056] This system can not only generate electricity, but also produce steam through a steam supply system, thus achieving diversified use of energy.

[0057] Steam generator 10 uses recovered heat energy to produce steam, which can meet the steam needs of industry or other fields.

[0058] The design of buffer tank 12 serves to equalize pressure and temperature, thereby stabilizing the pressure and temperature in the system and ensuring its stable operation.

[0059] The combined use of the precooler 7 and the recompressor 8 can further adjust and control the temperature and pressure of carbon dioxide in the system, thereby improving the controllability and stability of the system.

[0060] Using supercritical carbon dioxide as the working medium reduces the emission of greenhouse gases and other harmful substances compared to traditional fossil fuels, resulting in better environmental performance.

[0061] The system can be adjusted and optimized according to different energy demands and energy sources, exhibiting high flexibility and adaptability.

[0062] In summary, this high-temperature compression supercritical carbon dioxide cycle cogeneration system achieves efficient energy utilization and environmentally friendly emissions through efficient energy conversion, heat recovery and reuse, cogeneration, and system stability design, demonstrating significant technical benefits and application prospects.

[0063] On another front, this invention provides an operating method for a high-temperature compression supercritical carbon dioxide cycle cogeneration system. The supercritical carbon dioxide working fluid is compressed by the main compressor 1 and sequentially absorbs heat in the low-temperature regenerator 2, high-temperature regenerator 3, and boiler 4, becoming a high-temperature, high-pressure working fluid. It then enters the high-pressure turbine 5 to perform work. The exhaust gas is reheated by the boiler 4 and enters the low-pressure turbine 6 to perform work. The exhaust gas first releases heat through the high-temperature regenerator 3, and the outlet working fluid is divided into two paths. One path continues to release heat through the low-temperature regenerator 2, and the outlet working fluid is divided into three paths. One path is cooled by the precooler 7 and enters the main compressor 1 to start the recycle. The other path is compressed by the recompressor 8. The compressed fluid enters the buffer tank 12 and merges with the working fluid from the cold side outlet of the low-temperature regenerator 2. The third working fluid enters the cold water preheater 9 to preheat the cold water used for steam production. After releasing heat, it enters the precooler 7. The other working fluid from the outlet of the high-temperature regenerator 3 enters the high-temperature compressor 11 for compression and temperature increase, then enters the steam generator 10 to release heat, and then enters the buffer tank 12. The cold water absorbs heat in the cold water preheater 9 and the steam generator 10 in sequence, becoming high-temperature steam that meets industrial requirements, and then supplies it to users. The output power of the high-pressure turbine 5 and the low-pressure turbine 6 is partly used to drive the main compressor 1, the re-compressor 8 and the high-temperature compressor 11, and the rest is used for power generation.

[0064] Supercritical carbon dioxide working fluid is compressed by the main compressor 1 and then absorbed by the low-temperature regenerator 2, high-temperature regenerator 3, and boiler 4. It is then transformed into a high-temperature and high-pressure working fluid, which enters the high-pressure turbine 5 and low-pressure turbine 6 to do work, thus realizing the efficient conversion of thermal energy into mechanical energy.

[0065] A portion of the power output from the high-pressure turbine 5 and the low-pressure turbine 6 is used to drive the compressor, while the remainder is used to generate electricity, thus achieving efficient energy utilization.

[0066] The system achieves multi-stage energy utilization by setting up low-temperature regenerator 2 and high-temperature regenerator 3, thereby improving the energy utilization rate of the entire system.

[0067] The gas discharged from the turbine undergoes reheating and regeneration processes, further recovering heat energy and reducing energy loss.

[0068] This system not only generates electricity, but also produces high-temperature steam that meets industrial requirements through steam generator 10, realizing combined steam and electricity production and meeting the energy needs of different users.

[0069] The system is equipped with a buffer tank 12, which mixes multiple working fluids and plays a role in equalizing pressure and temperature, ensuring the stable operation of the system.

[0070] The working fluid forms a closed-loop cycle within the system, reducing the system's external dependence and improving operational reliability.

[0071] Using supercritical carbon dioxide as the working fluid can significantly reduce greenhouse gas emissions compared to traditional fossil fuels, resulting in good environmental benefits.

[0072] The system is designed to be highly efficient and energy-saving, enabling efficient energy utilization and contributing to the green transformation of the energy industry.

[0073] The system can be adjusted and optimized according to different energy demands and energy sources, and has high flexibility and scalability.

[0074] In summary, the operation method of this high-temperature compression supercritical carbon dioxide cycle cogeneration system has the technical advantages of high-efficiency energy conversion, multi-stage energy utilization, cogeneration, stable and reliable operation, environmental protection and energy saving, and flexible scalability. It is of great significance for promoting the green transformation of the energy industry and improving energy utilization efficiency.

[0075] This invention achieves a significant temperature increase by compressing the low-pressure, medium-temperature carbon dioxide working fluid on the hot side of a high-temperature regenerator, and heats the water to steam levels that meet industrial requirements, thus enabling the unit to supply industrial steam. The cold water used in this invention for producing industrial steam is preheated by a precooler, which recovers some of the waste heat from the cold end, reduces energy loss, and improves the system's energy utilization efficiency. This invention has minimal impact on the boiler inlet temperature, which is beneficial for the safe and stable operation of the boiler system. Furthermore, this invention has a simple system and requires relatively low investment.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature compression supercritical carbon dioxide cycle cogeneration system, characterized in that, It includes a main compressor (1), a regenerator unit, a turbine unit, a re-compressor (8), a boiler (4), and a steam supply unit; the outlet of the main compressor (1) is connected to the regenerator unit, the regenerator unit is connected to the boiler (4), and the boiler (4) is connected to the turbine unit; the regenerator unit is also connected to the re-compressor (8) and the steam supply unit, the re-compressor (8) is connected to the inlet of the main compressor (1), and the steam supply unit is used to produce stable steam; The regenerator unit includes a low-temperature regenerator (2) and a high-temperature regenerator (3). The outlet of the main compressor (1) is connected to the cold side inlet of the low-temperature regenerator (2), the cold side outlet of the low-temperature regenerator (2) is connected to the cold side inlet of the high-temperature regenerator (3), and the cold side outlet of the high-temperature regenerator (3) is connected to the gas inlet of the boiler (4). The steam supply unit includes a cold water preheater (9), a steam generator (10), a high-temperature compressor (11), and a buffer tank (12). The hot side outlet of the high-temperature regenerator (3) is connected to the inlet of the high-temperature compressor (11), the outlet of the high-temperature compressor (11) is connected to the hot side inlet of the steam generator (10), and the hot side outlet of the steam generator (10) is connected to the inlet of the buffer tank (12). The hot side outlet of the low-temperature regenerator (2) is connected to the hot side inlet of the cold water preheater (9), the hot side outlet of the cold water preheater (9) is connected to the inlet of the precooler (7), and the cold side outlet of the cold water preheater (9) is connected to the cold side inlet of the steam generator (10). The turbine unit includes a low-pressure turbine (6) and a high-pressure turbine (5). The main gas outlet of the boiler (4) is connected to the inlet of the high-pressure turbine (5). The outlet of the high-pressure turbine (5) is connected to the reheat inlet of the boiler (4). The reheat outlet of the boiler (4) is connected to the inlet of the low-pressure turbine (6). The outlet of the low-pressure turbine (6) is connected to the hot side inlet of the high-temperature regenerator (3). The hot side outlet of the high-temperature regenerator (3) is connected to the hot side inlet of the low-temperature regenerator (2).

2. The high-temperature compression supercritical carbon dioxide cycle cogeneration system according to claim 1, characterized in that, The hot side outlet of the low-temperature regenerator (2) is connected to the inlet of the precooler (7), and the outlet of the precooler (7) is connected to the inlet of the main compressor (1); the hot side outlet of the low-temperature regenerator (2) is connected to the inlet of the re-compressor (8), and the outlet of the re-compressor (8) is connected to the cold side inlet of the high-temperature regenerator (3).

3. The high-temperature compression supercritical carbon dioxide cycle cogeneration system according to claim 1, characterized in that, The cold side outlet of the low-temperature regenerator (2) is connected to the cold side inlet of the high-temperature regenerator (3) through the buffer tank (12), and the outlet of the compressor (8) is connected to the cold side inlet of the high-temperature regenerator (3) through the buffer tank (12).

4. The high-temperature compression supercritical carbon dioxide cycle cogeneration system according to claim 1, characterized in that, The buffer tank (12) has three inlets, which are connected to the outlet of the recompressor (8), the cold side outlet of the low-temperature regenerator (2), and the hot side outlet of the steam generator (10), respectively.

5. The high-temperature compression supercritical carbon dioxide cycle cogeneration system according to claim 1, characterized in that, The system's circulating working fluid is supercritical carbon dioxide.

6. The high-temperature compression supercritical carbon dioxide cycle cogeneration system according to claim 1, characterized in that, The outlet temperature of the high-temperature compressor (11) is 380~450℃; the cold side outlet temperature of the industrial steam of the steam generator (10) is 270~320℃.

7. An operation method for a high-temperature compression supercritical carbon dioxide cycle cogeneration system, characterized in that, The high-temperature compression supercritical carbon dioxide cycle cogeneration system according to any one of claims 1 to 6 includes the following steps: Supercritical carbon dioxide working fluid is compressed by the main compressor (1) and absorbs heat in the low-temperature regenerator (2), high-temperature regenerator (3), and boiler (4) in sequence to become high-temperature and high-pressure working fluid. Then it enters the high-pressure turbine (5) to do work. The exhaust gas is reheated by the boiler (4) and enters the low-pressure turbine (6) to do work. The exhaust gas first releases heat through the high-temperature regenerator (3), and the outlet working fluid is divided into two paths. One path continues to release heat through the low-temperature regenerator (2), and the outlet working fluid is divided into three paths. One path is cooled by the precooler (7) and enters the main compressor (1) to start the recirculation. The other path is compressed by the recompressor (8) and enters the buffer tank (12) to react with the working fluid from the low-temperature regenerator (2). 2) The working fluids at the cold side outlet converge, and the third working fluid enters the cold water preheater (9) to preheat the cold water used for steam production. After releasing heat, it enters the precooler (7); the other working fluid at the outlet of the high temperature regenerator (3) enters the high temperature compressor (11) for compression and temperature rise, and then enters the steam generator (10) to release heat, and then enters the buffer tank (12); the cold water absorbs heat in the cold water preheater (9) and the steam generator (10) in sequence, and becomes high temperature steam that meets industrial requirements, and then supplies it to users; part of the output power of the high pressure turbine (5) and the low pressure turbine (6) drives the main compressor (1), the re-compressor (8) and the high temperature compressor (11), and the rest is used for power generation.

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