Open carbon dioxide capture heat pump refrigeration multi-cogeneration system

Abstract

The application discloses an open type multi-connected supply system of carbon dioxide capturing heat pump refrigeration. The carbon dioxide capturing and utilizing subsystem of the multi-connected supply system is used for capturing and processing carbon dioxide in exhaust gas and delivering the carbon dioxide; the heat pump refrigeration subsystem combined with the open type injection-compressor is used for heating cycle, heat exchange, storage and delivery of the carbon dioxide; and the cold energy recycling subsystem is used for recycling the cold energy obtained through heat exchange in the carbon dioxide storage process. The system realizes capturing and processing of the carbon dioxide in the exhaust gas and recycling of the carbon dioxide as refrigerant for heating and refrigeration, the purified carbon dioxide is used as refrigerant to participate in the whole open type heat pump heating cycle to provide heat, the carbon dioxide liquid generated in the cycle process is collected and delivered to corresponding places for use, the system fully utilizes the carbon dioxide exhaust gas, reduces the emission of greenhouse gas, improves the system efficiency, and the cold and heat generated by the system is fully applied to production and life.

Description

Technical Field

[0001] This invention relates to a multi-generation system, and relates to the fields of heat pump, refrigeration, carbon dioxide capture, and waste gas utilization, specifically to an open-type carbon dioxide capture heat pump refrigeration multi-generation system. Background Technology

[0002] People are increasingly emphasizing the development and utilization of clean, safe, and efficient energy. Heat pumps, as a highly efficient and energy-saving clean heating device, are gaining popularity. Therefore, the refrigerant in heat pump and refrigeration cycles is receiving increasing attention. Carbon dioxide, a widely distributed gas in nature, can be recycled through various pathways. Its GWP (Global Warming Potential) is close to 1, contributing minimally to global warming and causing no damage to the ozone layer. Using carbon dioxide as a refrigerant can promote green and low-carbon development. Furthermore, in certain applications, especially at lower ambient temperatures, carbon dioxide offers a good energy efficiency ratio. However, currently, there is a lack of heat pump refrigeration systems that use carbon dioxide as a refrigerant and effectively utilize carbon dioxide from exhaust gases for multiple purposes. Summary of the Invention

[0003] To address the problems existing in the background technology, this invention provides an open-loop carbon dioxide capture heat pump cooling multi-generation system. The main objective of this invention is to continuously capture and filter carbon dioxide from waste gas, and then use the treated carbon dioxide as a refrigerant in an open-loop heat pump heating cycle for utilization. This achieves waste gas utilization, carbon dioxide capture, and greenhouse gas consumption, while the generated heat can be used for heat exchange with chilled water for user consumption.

[0004] The technical solution adopted in this invention is:

[0005] The open-type carbon dioxide capture heat pump cooling multi-generation system of the present invention includes:

[0006] The carbon dioxide capture and utilization subsystem is used to capture, treat, utilize, and transport carbon dioxide from waste gas containing carbon dioxide.

[0007] An open-jet compressor combined heat pump refrigeration subsystem is used to capture and utilize carbon dioxide delivered by the subsystem for heating cycles, heat exchange, storage, and transportation.

[0008] The cold energy reuse subsystem is used to store carbon dioxide supplied by the heat pump refrigeration subsystem that combines open jet compressor and heat pump, and to reuse the cold energy generated during the heat exchange process.

[0009] The carbon dioxide capture and utilization subsystem includes a waste gas storage tank, a cyclone separator, an electrostatic precipitator, an absorption tower, and a regeneration tower connected in sequence. The outlet of the regeneration tower is connected to a heat pump refrigeration subsystem that combines an open jet compressor and a heat pump.

[0010] The open-type jet-compressor combined heat pump refrigeration subsystem includes a first variable frequency compressor, a first condenser, a first circulating water pump, an ejector, a gas-liquid separator, a second variable frequency compressor, a second condenser, a second circulating water pump, a third circulating water pump, and a first storage tank. The inlet of the first variable frequency compressor is connected to the outlet of the regeneration tower of the carbon dioxide capture and utilization subsystem. The outlet of the first variable frequency compressor is connected to the first inlet of the first condenser. The first outlet of the first condenser is connected to the ejector fluid inlet. The outlet of the ejector is connected to the inlet of the gas-liquid separator. The outlet of the gas-liquid separator is connected to the inlet of the second variable frequency compressor. The outlet of the frequency compressor is connected to the first inlet of the second condenser, and the first outlet of the second condenser is connected to the working fluid inlet of the ejector; the liquid end outlet of the gas-liquid separator is connected to the inlets of the second and third circulating water pumps respectively; the outlet of the second circulating water pump is connected to the insulated first storage tank, and the outlet of the third circulating water pump is connected to the cold energy reuse subsystem; the inlet of the first circulating water pump is connected to the external water storage tank, the outlet of the first circulating water pump is connected to the second inlet of the first condenser, the second outlet of the first condenser is connected to the second inlet of the second condenser, and the second outlet of the second condenser is connected to the external user side for cold water heat exchange.

[0011] The aforementioned cold energy reuse subsystem includes a heat pipe, a fan, and a second storage tank. The heat pipe is installed on the second storage tank. The inlet of the second storage tank is connected to the outlet of the third circulating water pump of the open jet-compressor combined heat pump refrigeration subsystem. The fan is installed near the heat pipe and faces the surface of the heat pipe. The fan is connected to the user building / warehouse through pipelines.

[0012] The control method for a multi-generation system of the present invention includes:

[0013] The aforementioned multi-generation system first uses a carbon dioxide capture and utilization subsystem to capture, separate, and pre-treat carbon dioxide from waste gas containing carbon dioxide, obtaining pure initial refrigerant which is then delivered to an open-jet compressor combined heat pump refrigeration subsystem. The open-jet compressor combined heat pump refrigeration subsystem then uses the pure initial refrigerant for heating and heat exchange to obtain liquid refrigerant and hot water. The liquid refrigerant is stored and input into a cooling capacity reuse subsystem, while the hot water is supplied to the user side for use. The cooling capacity reuse subsystem stores the input refrigerant and generates cold air, which is then delivered to the user's building / warehouse for utilization.

[0014] The waste gas storage tank in the carbon dioxide capture and utilization subsystem stores waste gas containing carbon dioxide. The waste gas containing carbon dioxide is first fed into a cyclone separator and an electrostatic precipitator for pretreatment to remove impurities that may affect the separation efficiency and damage the equipment. Then it is fed into an absorption tower to contact the absorbent and absorb carbon dioxide. The absorbent that has absorbed carbon dioxide is sent to a regeneration tower for heating and the high-temperature, low-pressure carbon dioxide is completely released from the absorbent as pure initial refrigerant. The pure initial refrigerant is then fed into a heat pump refrigeration subsystem that uses an open-loop jet-compressor combination.

[0015] The open-jet compressor-compressor combined heat pump refrigeration subsystem first inputs pure initial refrigerant into the first variable frequency compressor for compression, then inputs it into the first condenser for the first heat exchange with chilled water. The carbon dioxide fluid after the first heat exchange is then injected into the ejector as a high-pressure, low-speed carbon dioxide fluid after subsequent heat pump cycles. The two carbon dioxide fluids are mixed at isobaric pressure in the mixing chamber of the ejector and then enter the gas-liquid separator for gas-liquid separation. The gas-liquid separator inputs the separated gas into the second variable frequency compressor for compression, and then inputs it into the second condenser for a second heat exchange with chilled water to obtain the high-pressure, low-speed gas after the heat pump cycle. The carbon dioxide fluid is ejected after the first heat exchange; the liquid separated by the gas-liquid separator is used as saturated liquid refrigerant and fed into the second and third circulating water pumps respectively. The second circulating water pump delivers the treated liquid refrigerant to the storage tank for heat preservation and storage, and the third circulating water pump delivers the treated liquid refrigerant to the cold energy reuse subsystem while keeping it at a low temperature; the first circulating water pump feeds cold water from the external water storage tank into the first condenser for countercurrent heat exchange, and then feeds it into the second condenser for countercurrent heat exchange again to obtain hot water, which is then delivered to the external user side for domestic and industrial use to complete the cold water heat exchange.

[0016] Carbon dioxide is pressurized and heated by the first variable frequency compressor to a relatively low pressure, such as around 2 MPa. After passing through the first condenser, the pressure remains constant while the temperature decreases. After passing through the ejector, the pressure and temperature increase. After passing through the gas-liquid separator, the pressure and temperature remain constant, reaching a medium pressure, such as 5 MPa. After passing through the second compressor, both temperature and pressure increase, reaching the target pressure, such as 10 MPa, at which point the carbon dioxide temperature can reach as high as 80–100°C. After passing through the second condenser, the temperature decreases while the pressure remains constant. After passing through the second circulating water pump, the temperature and pressure rise, reaching an intermediate pressure, such as 7–8 MPa, at which point the critical pressure of carbon dioxide is reached. After passing through the third circulating water pump, the temperature and pressure rise, reaching an intermediate pressure, such as 7–8 MPa, at which point the critical pressure of carbon dioxide is reached, but the refrigerant temperature is relatively low, around 10°C.

[0017] The second storage tank of the cold energy reuse subsystem, equipped with heat pipes, receives the input liquid refrigerant. A fan blows outside air onto the surface of the heat pipes, and the liquid refrigerant undergoes forced convection heat exchange through the heat pipes and fan to reach room temperature and is then stored, completing the carbon dioxide heat exchange. During the forced heat exchange process, a cold airflow is generated and transported through pipelines to the user's building / warehouse for utilization.

[0018] The beneficial effects of this invention are:

[0019] Carbon dioxide is a naturally occurring gas with a global warming potential far lower than many traditional fluorocarbon refrigerants, and its ozone depletion potential is zero. Carbon dioxide remains highly efficient at low temperatures, making it more suitable for commercial refrigeration and some industrial applications. As a non-toxic, non-flammable gas, it is safer than many traditional refrigerants. Due to its chemical stability, carbon dioxide poses a low risk of minor leaks and is less corrosive to equipment. The open-loop heat pump system of this invention can utilize carbon dioxide from exhaust gases for heating and cooling, as well as provide domestic hot water, achieving multiple uses in one system.

[0020] The present invention enables the capture and treatment of carbon dioxide in waste gas and its reuse as a refrigerant for heating and cooling. The purified carbon dioxide is used as a refrigerant in the entire open heat pump heating cycle to provide heat. The carbon dioxide liquid generated during the cycle is collected and transported to the appropriate location for use. The system makes full use of carbon dioxide waste gas, reduces greenhouse gas emissions, improves system efficiency, and the heating and cooling generated by the system are fully applied to production and daily life. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall working process of the open-type carbon dioxide capture heat pump cooling multi-generation system of the present invention;

[0022] In the diagram: 1. Waste gas tank, 2. Cyclone separator, 3. Electrostatic precipitator, 4. Absorption tower, 5. Regeneration tower, 6. First compressor, 7. First condenser, 8. First circulating water pump, 9. Ejector, 10. Gas-liquid separator, 11. Second compressor, 12. Second condenser, 13. Second circulating water pump, 14. Third circulating water pump, 15. Heat pipe, 16. Fan, 17. First storage tank, 18. Second storage tank, 19. Warehouse / user building. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1As shown, the open-type carbon dioxide capture heat pump cooling multi-generation system of the present invention includes a carbon dioxide capture and utilization subsystem, an open-type jet-compressor combined heat pump cooling subsystem, and a cold energy reuse subsystem. The carbon dioxide capture and utilization subsystem is used to capture, process, utilize, and transport carbon dioxide in waste gas containing carbon dioxide. The open-type jet-compressor combined heat pump cooling subsystem is used to perform heating cycle, heat exchange, storage, and transportation of the carbon dioxide transported by the carbon dioxide capture and utilization subsystem. The cold energy reuse subsystem is used to store the carbon dioxide transported by the open-type jet-compressor combined heat pump cooling subsystem and reuse the cold energy generated during the heat exchange process.

[0025] The carbon dioxide capture and utilization subsystem includes a waste gas storage tank 1, a cyclone separator 2, an electrostatic precipitator 3, an absorption tower 4, and a regeneration tower 5 connected in sequence. The outlet of the regeneration tower 5 is connected to a heat pump refrigeration subsystem that combines an open jet compressor and a heat pump.

[0026] The open-loop ejector-compressor combined heat pump refrigeration subsystem includes a first variable frequency compressor 6, a first condenser 7, a first circulating water pump 8, an ejector 9, a gas-liquid separator 10, a second variable frequency compressor 11, a second condenser 12, a second circulating water pump 13, a third circulating water pump 14, and a first storage tank 17. The inlet of the first variable frequency compressor 6 is connected to the outlet of the regeneration tower 5 of the carbon dioxide capture and utilization subsystem. The outlet of the first variable frequency compressor 6 is connected to the first inlet of the first condenser 7. The first outlet of the first condenser 7 is connected to the ejector fluid inlet of the ejector 9. The outlet of the ejector 9 is connected to the inlet of the gas-liquid separator 10. The outlet of the gas-liquid separator 10 is connected to the inlet of the second variable frequency compressor 11. The outlet of the second variable frequency compressor 11 is connected to the second condenser 12. The first inlet of the second condenser 12 is connected to the first outlet of the second condenser 12, which is connected to the working fluid inlet of the ejector 9. The liquid outlet of the gas-liquid separator 10 is connected to the inlets of the second circulating water pump 13 and the third circulating water pump 14, respectively, so that the liquid refrigerant can be stored through two paths, achieving multiple path options. The outlet of the second circulating water pump 13 is connected to the insulated first storage tank 17, and the outlet of the third circulating water pump 14 is connected to the cold energy reuse subsystem. The inlet of the first circulating water pump 8 is connected to the external water storage tank, and the outlet of the first circulating water pump 8 is connected to the second inlet of the first condenser 7. The second outlet of the first condenser 7 is connected to the second inlet of the second condenser 12, and the second outlet of the second condenser 12 is connected to the external user side for cold water heat exchange.

[0027] The cold energy reuse subsystem includes a heat pipe 15, a fan 16, and a second storage tank 18. The heat pipe 15 is installed on the second storage tank 18. The inlet of the second storage tank 18 is connected to the outlet of the third circulating water pump 14 of the open jet-compressor combined heat pump refrigeration subsystem. The fan 16 is installed near the heat pipe 15 and faces the surface of the heat pipe 15. The fan 16 is connected to the user building / warehouse 19 through pipelines.

[0028] The control method of the multi-generation system of the present invention is as follows:

[0029] The multi-generation system first uses a carbon dioxide capture and utilization subsystem to capture, separate, and pre-treat carbon dioxide from waste gas containing carbon dioxide, obtaining pure initial refrigerant which is then delivered to an open-jet-compressor combined heat pump refrigeration subsystem. The open-jet-compressor combined heat pump refrigeration subsystem uses the pure initial refrigerant for heating and heat exchange to obtain liquid refrigerant and hot water. The liquid refrigerant is stored and input into a cooling capacity reuse subsystem, while the hot water is supplied to the user side for use. The cooling capacity reuse subsystem stores the input refrigerant and generates cold air, which is then delivered to the user building / warehouse 19 for utilization.

[0030] The waste gas storage tank 1 in the carbon dioxide capture and utilization subsystem stores waste gas containing carbon dioxide. The waste gas containing carbon dioxide is first fed into the cyclone separator 2 and the electrostatic precipitator 3 for pretreatment to remove impurities that affect the separation efficiency and may damage the equipment. Then it is fed into the absorption tower 4 to contact the absorbent and absorb carbon dioxide. The absorbent that has absorbed carbon dioxide is sent to the regeneration tower 5 for heating and to completely release the high-temperature, low-pressure carbon dioxide from the absorbent as pure initial refrigerant. The pure initial refrigerant is then fed into the open-jet compressor combined heat pump refrigeration subsystem.

[0031] The open-jet compressor-compressor combined heat pump refrigeration subsystem first inputs pure initial refrigerant into the first variable frequency compressor 6 for compression, then inputs it into the first condenser 7 for the first heat exchange with chilled water. The carbon dioxide fluid after the first heat exchange is then injected into the ejector 9 by the high-pressure, low-speed carbon dioxide fluid after subsequent heat pump cycles. The two carbon dioxide fluids are mixed at isobaric pressure in the mixing chamber of ejector 9 and then enter the gas-liquid separator 10 for gas-liquid separation. The gas-liquid separator 10 inputs the separated gas into the second variable frequency compressor 11 for compression, and then inputs it into the second condenser 12 for the second heat exchange with chilled water to obtain high-pressure, low-speed carbon dioxide after the heat pump cycle. Carbon fluid is ejected from the carbon dioxide fluid after the first heat exchange; the liquid separated by the gas-liquid separator 10 is used as saturated liquid refrigerant and fed into the second circulating water pump 13 and the third circulating water pump 14 respectively. The second circulating water pump 13 transports the processed liquid refrigerant to the storage tank 17 for heat preservation and storage, and the third circulating water pump 14 transports the processed liquid refrigerant to the cold energy reuse subsystem while keeping it at a temperature; the first circulating water pump 8 inputs cold water from the external water storage tank into the first condenser 7 for countercurrent heat exchange, and then inputs it into the second condenser 12 for countercurrent heat exchange again to obtain hot water, which is then transported to the external user side for domestic and industrial use to complete the cold water heat exchange.

[0032] Carbon dioxide is pressurized and heated by the first variable frequency compressor to a relatively low pressure, such as around 2 MPa. After passing through the first condenser, the pressure remains constant while the temperature decreases. After passing through the ejector, the pressure and temperature increase. After passing through the gas-liquid separator, the pressure and temperature remain constant, reaching a medium pressure, such as 5 MPa. After passing through the second compressor, both temperature and pressure increase, reaching the target pressure, such as 10 MPa, at which point the carbon dioxide temperature can reach as high as 80–100°C. After passing through the second condenser, the temperature decreases while the pressure remains constant. After passing through the second circulating water pump, the temperature and pressure rise, reaching an intermediate pressure, such as 7–8 MPa, at which point the critical pressure of carbon dioxide is reached. After passing through the third circulating water pump, the temperature and pressure rise, reaching an intermediate pressure, such as 7–8 MPa, at which point the critical pressure of carbon dioxide is reached, but the refrigerant temperature is relatively low, around 10°C.

[0033] The second storage tank 18 of the cold energy reuse subsystem, equipped with heat pipe 15, receives the input liquid refrigerant. The fan 16 blows outside air onto the surface of the heat pipe 15. The liquid refrigerant undergoes forced convection heat exchange through the heat pipe 15 and the fan 16 to reach room temperature and is stored, completing the carbon dioxide heat exchange. During the forced heat exchange process, a cold airflow is generated and transported through pipelines to the user building / warehouse 19 for utilization.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly, and any connection method suitable for the system can be used, including but not limited to direct connection and indirect connection. The specific meaning of the above terms in the invention can be understood according to the specific circumstances. Furthermore, it should be noted that the primary purpose of the descriptions in the specification and embodiments is to provide clarity, and specific implementation examples should be applied according to the specific field and scenario.

[0035] The foregoing general description of the invention and its specific embodiments should not be construed as a limitation on the technical solution of the invention. Those skilled in the art or related fields, based on the disclosure of this application, may add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the invention, thereby forming other technical solutions within the scope of protection of this application.

Claims

1. An open-type carbon dioxide capture heat pump refrigeration multi-generation system, characterized in that, include: The carbon dioxide capture and utilization subsystem is used to capture, treat, utilize, and transport carbon dioxide from waste gas containing carbon dioxide. An open-jet compressor combined heat pump refrigeration subsystem is used to capture and utilize carbon dioxide delivered by the subsystem for heating cycles, heat exchange, storage, and transportation. The cold energy reuse subsystem is used to store the carbon dioxide delivered by the heat pump refrigeration subsystem that combines open jet compressor and heat pump and reuse the cold energy generated by heat exchange during the storage process. The carbon dioxide capture and utilization subsystem includes a waste gas storage tank (1), a cyclone separator (2), an electrostatic precipitator (3), an absorption tower (4), and a regeneration tower (5) connected in sequence. The outlet of the regeneration tower (5) is connected to a heat pump refrigeration subsystem that combines open jet and compressor. The open-type jet-compressor combined heat pump refrigeration subsystem includes a first variable frequency compressor (6), a first condenser (7), a first circulating water pump (8), an ejector (9), a gas-liquid separator (10), a second variable frequency compressor (11), a second condenser (12), a second circulating water pump (13), a third circulating water pump (14), and a first storage tank (17). The inlet of the first variable frequency compressor (6) is connected to the carbon dioxide capture and utilization subsystem, the outlet of the first variable frequency compressor (6) is connected to the first inlet of the first condenser (7), the first outlet of the first condenser (7) is connected to the ejector fluid inlet of the ejector (9), the outlet of the ejector (9) is connected to the inlet of the gas-liquid separator (10), and the gas end outlet of the gas-liquid separator (10) is connected to the inlet of the second variable frequency compressor (11). The outlet of the second variable frequency compressor (11) is connected to the first inlet of the second condenser (12), and the first outlet of the second condenser (12) is connected to the working fluid inlet of the ejector (9); the liquid end outlet of the gas-liquid separator (10) is connected to the inlets of the second circulating water pump (13) and the third circulating water pump (14), respectively; the outlet of the second circulating water pump (13) is connected to the first storage tank (17), and the outlet of the third circulating water pump (14) is connected to the cold energy reuse subsystem; the inlet of the first circulating water pump (8) is connected to the external water storage tank, the outlet of the first circulating water pump (8) is connected to the second inlet of the first condenser (7), the second outlet of the first condenser (7) is connected to the second inlet of the second condenser (12), and the second outlet of the second condenser (12) is connected to the external user side.

2. The open-type carbon dioxide capture heat pump cooling multi-generation system according to claim 1, characterized in that: The cold energy reuse subsystem includes a heat pipe (15), a fan (16), and a second storage tank (18). The heat pipe (15) is installed on the second storage tank (18). The inlet of the second storage tank (18) is connected to the heat pump refrigeration subsystem of the open jet compressor. The fan (16) is installed near the heat pipe (15) and directly facing the surface of the heat pipe (15). The fan (16) is connected to the user building / warehouse (19) through a pipeline.

3. The control method for a multi-generation system according to any one of claims 1-2, characterized in that, include: The aforementioned multi-generation system first captures, separates, and pre-treats carbon dioxide in the exhaust gas containing carbon dioxide through a carbon dioxide capture and utilization subsystem to obtain initial refrigerant, which is then delivered to the heat pump refrigeration subsystem that combines open-jet and compressor functions. The open-jet compressor combined heat pump refrigeration subsystem obtains liquid refrigerant and hot water after the initial refrigerant undergoes heating cycle and heat exchange. The liquid refrigerant is stored and input into the cold energy reuse subsystem, and the hot water is input into the user side for use. The cold energy reuse subsystem stores the input refrigerant and generates cold air, which is then delivered to the user's building / warehouse (19) for use.

4. The control method for a multi-generation system according to claim 3, characterized in that: The waste gas storage tank (1) in the carbon dioxide capture and utilization subsystem stores waste gas containing carbon dioxide. The waste gas containing carbon dioxide is first fed into the cyclone separator (2) and the electrostatic precipitator (3) for pretreatment to remove impurities. Then it is fed into the absorption tower (4) to contact the absorbent and absorb carbon dioxide. The absorbent that has absorbed carbon dioxide is sent into the regeneration tower (5) for heating and the carbon dioxide is completely released from the absorbent as the initial refrigerant. The initial refrigerant is fed into the heat pump refrigeration subsystem of open jet-compressor combination.

5. The control method for a multi-generation system according to claim 3, characterized in that: The open-jet compressor combined heat pump refrigeration subsystem first inputs the initial refrigerant into the first variable frequency compressor (6) for compression, and then inputs it into the first condenser (7) for the first heat exchange with cold water. The carbon dioxide fluid after the first heat exchange is then injected into the ejector (9) by the carbon dioxide fluid after the subsequent heat pump cycle. The two carbon dioxide fluids are mixed at the same pressure in the mixing chamber of the ejector (9) and then enter the gas-liquid separator (10) for gas-liquid separation. The gas-liquid separator (10) inputs the separated gas into the second variable frequency compressor (11) for compression, and then inputs it into the second condenser (12) for the second heat exchange with cold water to obtain the carbon dioxide fluid after the heat pump cycle. The carbon dioxide fluid after the first heat exchange is ejected; the liquid separated by the gas-liquid separator (10) is used as saturated liquid refrigerant and fed into the second circulating water pump (13) and the third circulating water pump (14) respectively. The second circulating water pump (13) transports the processed liquid refrigerant to the storage tank (17) for heat preservation and storage, and the third circulating water pump (14) transports the processed liquid refrigerant to the cold energy reuse subsystem for heat preservation and storage. The first circulating water pump (8) inputs the cold water input from the external water storage tank into the first condenser (7) for countercurrent heat exchange, and then inputs it into the second condenser (12) for countercurrent heat exchange again to obtain hot water, which is then transported to the external user side for use to complete the cold water heat exchange.

6. The control method for a multi-generation system according to claim 3, characterized in that: The second storage tank (18) of the cold energy reuse subsystem, which is equipped with heat pipe (15), receives the input liquid refrigerant. The fan (16) blows outside air onto the surface of the heat pipe (15). The liquid refrigerant is forced to convect and exchange heat through the heat pipe (15) and the fan (16) to room temperature and is stored, thus completing the carbon dioxide heat exchange. During the forced heat exchange process, a cold airflow is generated and transported through pipelines to the user building / warehouse (19) for use.

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