CO2 working medium combined cooling and power supply system integrated with three-outlet vortex tube and working method of CO2 working medium combined cooling and power supply system

Abstract

The invention relates to the technical field of heat energy and power engineering, and discloses a CO2 working medium combined cooling and power supply system integrated with a three-outlet vortex tube and a working method thereof.According to the system, supercritical CO2 is separated into hot gas, cold gas and liquid flow through the vortex tube, and the cold gas and part of the liquid flow are mixed and enter an evaporator for refrigeration; residual liquid flows through a booster pump, a heat regenerator, a heater and a turbine to form a power generation branch, so that the problem of CO2 condensation of a traditional CO2 power generation system in a high-temperature environment is solved; and after the compressor and turbine exhaust steam are mixed, waste heat is released in a heat regenerator to preheat liquid flow of a power generation branch, and closed-loop energy recovery is formed. According to the combined cooling and power supply system, through organic integration of supercritical CO2 energy separation, mixing and energy recovery, efficient coupling of combined cooling and power supply is achieved in single CO2 working medium circulation, and the thermal performance and economical efficiency of the system are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal energy and power engineering, and particularly relates to a CO2 working medium combined cooling and power generation system integrated with a three-outlet vortex tube and a working method thereof. Background Technique

[0002] Under the background of the intensifying trend of global warming, the problem of greenhouse gas emissions caused by the continuous consumption of fossil fuels has attracted great attention from society. To address this environmental challenge, academia and industry are actively exploring environmentally friendly working media to replace synthetic working media such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) used in traditional refrigeration and power generation systems. Among many natural working medium candidate materials, carbon dioxide (CO2) has attracted much attention due to its unique physical and chemical properties: as a Class A1 safe working medium, it not only has significant environmental protection advantages of zero ozone depletion potential (ODP) and low global warming potential (GWP = 1), but also has engineering application characteristics such as non-flammable, non-toxic, and easy availability of raw materials, and is particularly suitable for system operation under low-temperature working conditions.

[0003] In recent years, the research on energy conversion technologies based on CO2 working media has shown a significant growth trend, and CO2 working media have shown broad application prospects in the fields of power generation, refrigeration, and combined cooling and power generation. The power generation cycles using CO2 as the working medium mainly include the transcritical CO2 Rankine cycle as shown in Figure 1 and the supercritical CO2 Brayton cycle as shown in Figure 2 . The transcritical Rankine cycle as shown in Figure 1 realizes thermal-electric conversion through the expansion work of the turbine 7, but the subcritical condensation process of its condenser 11 is highly dependent on low-temperature heat sources, and it is difficult for the CO2 working medium to be effectively condensed in high-temperature environments, resulting in limited system efficiency. The supercritical Brayton cycle as shown in Figure 2 can apply to higher heat source temperatures, but a large amount of energy will be dissipated when the working medium cools down in the gas cooler 13, and the power consumption of the compressor 10 is relatively high, and there is limited room for improvement in the overall energy efficiency.

[0004] In the refrigeration field, the transcritical CO2 compression refrigeration cycle is the core technology. As shown in Figure 3 , it realizes the pressure reduction and temperature reduction of the working medium through the throttle valve 12 to obtain cooling capacity. However, the irreversible throttling process of the traditional throttle valve 12 causes significant energy loss, and the refrigeration efficiency further decreases especially under high-temperature working conditions.

[0005] As shown in Figure 4As shown in the figure, in the existing CO2-based combined cooling and power generation system, power generation and refrigeration cycles (such as supercritical Brayton cycle and transcritical refrigeration cycle) are coupled through a shared gas cooler. Although combined cooling and power output is achieved, the inlet temperature of the CO2 working fluid at the compressor 10 is relatively high in a high-temperature environment, which increases the power consumption of the compressor 10 and further reduces the efficiency of the power generation cycle; the pressure difference before and after the throttle valve 12 is relatively large, resulting in a large energy loss in the irreversible expansion process. In addition, the internal pressure energy of the system is not recovered through effective means, leading to additional energy consumption. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above problems and provide a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube and its working method, which solves the problems of difficult condensation of CO2 and large throttling losses inside the refrigeration subsystem in a high-temperature environment, and reduces the energy consumption of the system.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube, including a first cooler, a vortex tube, an evaporator, a booster pump, a recuperator, a heater, a turbine, a generator, a second cooler, and a compressor; The outlet of the first cooler is connected to the inlet of the vortex tube. The vortex tube includes a hot-end outlet, a cold-end outlet, and a middle liquid outlet. The cold-end outlet of the vortex tube is connected to the inlet of the evaporator, the hot-end outlet of the vortex tube is connected to the inlet of the second cooler, and the middle liquid outlet of the vortex tube is provided with two branch pipes. The first branch pipe is connected to the inlet of the booster pump, and the second branch pipe joins the pipeline of the cold-end outlet of the vortex tube and then accesses the inlet of the evaporator; The outlet of the booster pump is connected to the inlet of the cold-side channel of the recuperator, the outlet of the cold-side channel of the recuperator is connected to the inlet of the heater, the outlet of the heater is connected to the inlet of the turbine, and the turbine is coaxially connected to the generator; The outlet of the second cooler and the outlet pipeline of the evaporator are jointly connected to the inlet of the compressor, the outlet of the compressor and the outlet of the turbine are jointly connected to the inlet of the hot-side channel of the recuperator, and the outlet of the hot-side channel of the recuperator is connected to the inlet of the first cooler, forming a closed circulation loop.

[0008] A further improvement of the present invention is that the recuperator is provided with a cold-side channel and a hot-side channel, where the cold-side channel connects the booster pump and the heater, and the hot-side channel connects the compressor, the turbine, and the first cooler.

[0009] A further improvement of the present invention is that the exhaust pipe of the turbine and the exhaust pipe of the compressor are joined through a mixer and then access the hot-side channel of the recuperator.

[0010] A further improvement of the present invention lies in that the outlet of the booster pump is sequentially connected to the cold side channel of the regenerator, the heater and the inlet of the turbine to form a high-temperature work branch.

[0011] A further improvement of the present invention lies in that the outlet of the hot side channel of the regenerator is connected to the inlet of the first cooler to form a waste heat recovery channel.

[0012] A further improvement of the present invention lies in that flow regulating valves are provided on both of the two branch pipes at the middle liquid outlet for regulating the diversion ratio of the middle liquid flow.

[0013] Second, the present invention also provides a working method of a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube, including the following steps: S1. The supercritical CO2 at the outlet of the first cooler enters the vortex tube for energy separation to separate out hot gas, cold gas and liquid flow; S2. The hot gas is input into the second cooler, and the cold gas and part of the liquid flow are mixed and then input into the evaporator to absorb heat and evaporate. The remaining liquid flow flows through the booster pump, the regenerator and the heater in sequence to be heated into high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the turbine to expand and do work to drive the generator to generate electricity; S3. After the two-phase flow formed by mixing the cold gas and part of the liquid flow absorbs external heat and evaporates in the evaporator, it is mixed with the cooled hot gas discharged from the second cooler and pressurized by the compressor to form medium-pressure gas; S4. The exhaust steam of the turbine is mixed with the medium-pressure gas discharged from the compressor and then enters the hot side channel of the regenerator to release waste heat, and then returns to the first cooler for cooling to complete the cycle.

[0014] A further improvement of the present invention lies in that in the step S1, the hot gas is separated through the hot end outlet of the vortex tube, the cold gas is separated through the cold end outlet, and the liquid flow is separated through the middle liquid outlet.

[0015] A further improvement of the present invention lies in that in the step S1, by adjusting the diversion ratio of the middle liquid outlet of the vortex tube, the liquid flow rates entering the booster pump and the evaporator are controlled to adjust the power generation and refrigeration output ratios.

[0016] A further improvement of the present invention lies in that the high-temperature gas flow at the hot end is cooled by the second cooler and then mixed with the gas at the outlet of the evaporator, and then compressed by the compressor. The exhaust steam of the compressor is mixed with the exhaust steam of the turbine and then enters the regenerator for waste heat recovery, and finally returns to the first cooler to complete the cycle.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube. Taking the vortex tube as the core connection node, through the three-way diversion characteristics of its hot-end outlet, cold-end outlet, and middle liquid outlet, supercritical CO2 is separated into a liquid stream, cold gas, and hot gas. The cold gas at the cold-end outlet is mixed with a part of the liquid stream and directly enters the evaporator. By utilizing the phase change of liquid CO2 to enhance the heat absorption capacity, the refrigeration efficiency is significantly improved. The remaining liquid stream is pressurized by a booster pump to form a power generation branch. Combining the waste heat recovery of the regenerator and the external heat source input of the heater, the problem that it is difficult for the CO2 working medium to condense in a traditional CO2 power generation system under high-temperature conditions is solved. After the hot gas is appropriately cooled by the second cooler, it is mixed with the gas at the evaporator outlet and enters the compressor. This not only avoids the efficiency reduction caused by directly compressing high-temperature gas but also ensures the stable operation of the compressor through the control of the mixed working medium temperature. The mixed working medium of the compressor and the exhaust steam of the turbine releases waste heat in the regenerator, providing preheating for the pressurized liquid stream of the power generation branch, forming a closed-loop energy recovery. The combined cooling and power generation system of the present invention realizes the efficient coupling of combined cooling and power generation through the organic integration of the energy separation, mixing, and energy recovery of supercritical CO2, significantly improving the thermodynamic performance and economy of the system.

[0018] The present invention also provides a working method for a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube. First, the vortex tube is used to separate the energy of supercritical CO2 to obtain hot gas, cold gas, and liquid stream, providing a basis for subsequent refrigeration and power generation processes and realizing the effective hierarchical utilization of energy. Secondly, the cold gas is mixed with a part of the liquid stream and absorbs heat and evaporates in the evaporator to achieve refrigeration. The remaining liquid stream passes through a booster pump, a regenerator, and a heater to form high-temperature and high-pressure gas and enter the turbine for power generation, enabling the refrigeration and power generation processes to be organically combined and not interfere with each other, improving the comprehensive energy utilization efficiency. Then, the gas discharged from the evaporator is mixed with the cooled hot gas and pressurized by the compressor. The exhaust steam of the turbine is mixed with the gas discharged from the compressor and undergoes a heat regeneration and cooling process to complete the cycle, ensuring the stable operation of the system and the recycling of energy. This working method improves the overall performance and energy utilization efficiency of the system through the coordinated cooperation of each step, realizing the efficient operation of combined cooling and power generation. Description of the Drawings

[0019] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the figures are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention.

[0020] Figure 1 is the transcritical CO2 Rankine cycle in the prior art; Figure 2 is the supercritical CO2 Brayton cycle in the prior art; Figure 3 is a transcritical CO2 compression refrigeration cycle in the prior art; Figure 4 is a CO2 refrigerant cold and power combined supply system in the prior art; Figure 5 is a CO2 refrigerant cold and power combined supply system integrating a three - outlet vortex tube of the present invention.

[0021] Wherein: 1. First cooler; 2. Vortex tube; 3. Evaporator; 4. Booster pump; 5. Regenerator; 6. Heater; 7. Turbine; 8. Generator; 9. Second cooler; 10. Compressor; 11. Condenser; 12. Throttle valve; 13. Gas cooler. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0024] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0027] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "linked" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings: As Figure 5 shown, the present invention provides a CO2 working medium cold and power combined supply system integrating a three-outlet vortex tube, including a first cooler 1, a vortex tube 2, an evaporator 3, a booster pump 4, a recuperator 5, a heater 6, a turbine 7, a generator 8, a second cooler 9, and a compressor 10; wherein the outlet of the first cooler 1 is connected to the inlet of the vortex tube 2. The vortex tube 2 includes a hot end outlet, a cold end outlet, and a middle liquid outlet. The cold end outlet of the vortex tube 2 is connected to the inlet of the evaporator 3, the hot end outlet of the vortex tube 2 is connected to the inlet of the second cooler 9, and the middle liquid outlet of the vortex tube 2 is provided with two branch pipes. The first branch pipe is connected to the inlet of the booster pump 4, and the second branch pipe joins the cold end outlet pipe of the vortex tube 2 and then accesses the inlet of the evaporator 3. Through the connection of different outlets of the vortex tube 2 to corresponding components, the loss of the energy transfer link is effectively reduced, and the overall energy utilization efficiency of the system is improved.

[0029] It should be noted that flow regulating valves are provided on both of the two branch pipes at the middle liquid outlet, which are used to adjust the flow splitting ratio of the middle liquid flow, so as to realize the on-demand regulation and optimization of the cold energy and electric energy output of the system.

[0030] The recuperator 5 is provided with a cold side channel and a hot side channel. The outlet of the booster pump 4 is connected to the inlet of the cold side channel of the recuperator 5. The outlet of the cold side channel of the recuperator 5 is connected to the inlet of the heater 6. The outlet of the heater 6 is connected to the inlet of the turbine 7. The turbine 7 and the generator 8 are coaxially connected. The outlet of the booster pump 4 is sequentially connected to the inlet of the cold side channel of the recuperator 5, the heater 6, and the turbine 7 to form a high-temperature work branch, so that the pressurized CO2 is first preheated in the cold side channel of the recuperator 5 and then heated by the heater 6 to form a high-temperature and high-pressure gas to drive the turbine 7 to generate electricity, effectively utilizing the waste heat of the system, improving the energy utilization efficiency, and realizing the power generation function at the same time.

[0031] The outlet of the second cooler 9 and the outlet pipe of the evaporator 3 are jointly connected to the inlet of the compressor 10. The exhaust pipe outlet of the compressor 10 and the exhaust pipe outlet of the turbine 7 converge through a mixer and then are connected to the inlet of the hot side channel of the recuperator 5. The outlet of the hot side channel of the recuperator 5 is connected to the inlet of the first cooler 1, forming a closed circulation loop, realizing the recycling of the working medium among the components of the system, effectively recovering waste heat, reducing energy loss, and improving the energy utilization efficiency and operation stability of the entire combined cooling and power supply system.

[0032] The present invention also provides a working method for an integrated three-outlet vortex tube CO2 working medium combined cooling and power supply system, including the following steps: S1, The supercritical CO2 at the outlet of the first cooler 1 enters the vortex tube 2 for energy separation. The hot gas is separated from the hot end outlet of the vortex tube 2, the cold gas is separated from the cold end outlet, and the liquid flow is separated from the middle liquid outlet. S2, The hot gas is input into the second cooler 9. The cold gas and part of the liquid flow are mixed and then input into the evaporator 3 to absorb heat and evaporate. The remaining liquid flow successively flows through the booster pump 4, the recuperator 5, and the heater 6 to be heated to form a high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the turbine 7 to expand and do work to drive the generator 8 to generate electricity. S3, After the two-phase flow formed by the mixture of the cold gas and part of the liquid flow absorbs external heat and evaporates in the evaporator 3, it is mixed with the cooled hot gas discharged from the second cooler 9 and is pressurized by the compressor 10 to form a medium-pressure gas. S4, The exhaust of the turbine 7 and the medium-pressure gas discharged from the compressor 10 are mixed and then enter the hot side channel of the recuperator 5 to release waste heat, and then return to the first cooler 1 for cooling to complete the cycle.

[0033] It should be noted that by adjusting the diversion ratio of the middle liquid outlet of the vortex tube 2, the liquid flow rates entering the booster pump 4 and the evaporator 3 are controlled to adjust the power generation and refrigeration output ratios.

[0034] Working principle: The present invention relates to a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube. The vortex tube is used as the core component connecting the power generation and refrigeration subsystems. By ingeniously utilizing the ability of the vortex tube to achieve dual separation of gas-liquid and temperature, it effectively solves or alleviates the bottleneck problems in the traditional system, such as the difficulty of condensing CO2 in the power generation subsystem under high-temperature environments and the large throttling losses inside the refrigeration subsystem. At the same time, the supply ratio of cooling energy and electric energy in the system can be adjusted by regulating the branch flow rate at the liquid outlet of the vortex tube. The present invention consists of a first cooler, a vortex tube, an evaporator, a booster pump, a recuperator, a heater, a turbine, a generator, a second cooler, and a compressor. In this system, the vortex tube separates supercritical CO2 into a liquid stream, a cold gas stream, and a hot gas stream. Subsequently, the liquid stream is divided into two branches. One branch mixes with the cold gas separated by the vortex tube and then enters the evaporator for the refrigeration process, while the other branch successively passes through the booster pump, the recuperator, the heater, and the turbine for the power generation process. The hot gas separated by the vortex tube is cooled and then mixed with the gas at the outlet of the evaporator. After being pressurized by the compressor, it is mixed with the gas at the outlet of the turbine. Finally, it is cooled successively by the recuperator and the cooler to complete the entire cycle process. Compared with the traditional CO2-based combined cooling and power generation system, the design configuration of the present invention significantly improves the thermodynamic performance and economic efficiency of the system, providing new ideas and technical approaches for the efficient application of combined cooling and power generation technology.

[0035] Upon reading the above description, many embodiments and many applications other than the provided examples will be apparent to those skilled in the art. Therefore, the scope of this teaching should not be determined by reference to the above description, but should be determined by reference to the full scope of the foregoing claims and the equivalents thereof. For the sake of completeness, all articles and references, including the disclosures of patent applications and patents, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

[0036] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation of the present invention is limited thereto. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as falling within the protection scope determined by the claims submitted for the present invention.

Claims

1. An integrated cold and power co-generation system with a three-outlet vortex tube using CO2 as the working fluid, characterized in that, It includes a first cooler (1), a vortex tube (2), an evaporator (3), a booster pump (4), a recuperator (5), a heater (6), a turbine (7), a generator (8), a second cooler (9) and a compressor (10); The outlet of the first cooler (1) is connected to the inlet of the vortex tube (2). The vortex tube (2) includes a hot end outlet, a cold end outlet and a middle liquid outlet. The cold end outlet of the vortex tube (2) is connected to the inlet of the evaporator (3). The hot end outlet of the vortex tube (2) is connected to the inlet of the second cooler (9). There are two branch pipes at the middle liquid outlet of the vortex tube (2). The first branch pipe is connected to the inlet of the booster pump (4), and the second branch pipe joins the cold end outlet pipe of the vortex tube (2) and then accesses the inlet of the evaporator (3); The outlet of the booster pump (4) is connected to the inlet of the cold side channel of the recuperator (5). The outlet of the cold side channel of the recuperator (5) is connected to the inlet of the heater (6). The outlet of the heater (6) is connected to the inlet of the turbine (7). The turbine (7) is coaxially connected to the generator (8); The outlet of the second cooler (9) and the outlet pipe of the evaporator (3) are jointly connected to the inlet of the compressor (10). The outlet of the compressor (10) and the outlet of the turbine (7) are jointly connected to the inlet of the hot side channel of the recuperator (5). The outlet of the hot side channel of the recuperator (5) is connected to the inlet of the first cooler (1) to form a closed circulation loop; 2. The CO2 working medium cold and power combined supply system integrating a three-outlet vortex tube according to claim 1, characterized in that, The recuperator (5) is provided with a cold side channel and a hot side channel. The cold side channel communicates the booster pump (4) with the heater (6), and the hot side channel communicates the compressor (10), the turbine (7) with the first cooler (1); 3. The CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube according to claim 1, characterized in that, The exhaust pipe of the turbine (7) and the exhaust pipe of the compressor (10) are joined through a mixer and then access the hot side channel of the recuperator (5); 4. An integrated CO2 working medium cold and power combined supply system with a three-outlet vortex tube according to claim 1, characterized in that, The outlet of the booster pump (4) is successively connected to the cold side channel of the recuperator (5), the heater (6) and the inlet of the turbine (7) to form a high-temperature work branch; 5. The CO2-based cold and power combined supply system integrated with a three-outlet vortex tube according to claim 1, characterized in that, The outlet of the hot side channel of the recuperator (5) is connected to the inlet of the first cooler (1) to form a waste heat recovery channel; 6. The CO2 working medium cold and power combined supply system integrating a three-outlet vortex tube according to claim 1, wherein Flow regulating valves are arranged on both of the two branch pipes at the middle liquid outlet for regulating the diversion ratio of the middle liquid flow; 7. A working method of a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube, characterized in that, It includes the following steps: S1. The supercritical CO2 at the outlet of the first cooler (1) enters the vortex tube (2) for energy separation, separating out hot gas, cold gas and liquid flow; S2. Input the hot gas into the second cooler (9). The cold gas and part of the liquid flow are mixed and then input into the evaporator (3) to absorb heat and evaporate. The remaining liquid flow successively flows through the booster pump (4), the recuperator (5) and the heater (6) to be heated to form high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the turbine (7) to expand and do work to drive the generator (8) to generate electricity; S3. After the two-phase flow formed by mixing the cold gas and part of the liquid flow absorbs external heat and evaporates in the evaporator (3), it is mixed with the cooled hot gas discharged from the second cooler (9) and is pressurized by the compressor (10) to form medium-pressure gas; In S4, the exhaust steam of the turbine (7) is mixed with the medium-pressure gas discharged from the compressor (10) and then enters the hot-side channel of the recuperator (5) to release the waste heat, and then returns to the first cooler (1) for cooling to complete the cycle.

8. The working method of a CO2-based combined cooling and power supply system integrated with a three-outlet vortex tube according to claim 7, characterized in that In the above-mentioned S1, the vortex tube (2) separates hot gas through the hot-end outlet, cold gas through the cold-end outlet, and liquid flow through the middle liquid outlet.

9. The working method of a CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube according to claim 7, characterized in that, In the above-mentioned S1, by adjusting the diversion ratio of the middle liquid outlet of the vortex tube (2), the liquid flow rates entering the booster pump (4) and the evaporator (3) are controlled to adjust the power generation and refrigeration output ratios.

10. The CO2-based combined cooling and power generation system integrated with a three-outlet vortex tube according to claim 7, characterized in that, The hot gas at the hot end is cooled by the second cooler (9) and then mixed with the gas at the outlet of the evaporator (3), and then compressed by the compressor (10). The exhaust steam of the compressor (10) is mixed with the exhaust steam of the turbine (7) and then enters the recuperator (5) for waste heat recovery, and finally returns to the first cooler (1) to complete the cycle.

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