A gas-liquid solubility change pressurization heat exchange method

Abstract

A gas-liquid solubility change pressurization heat exchange method, comprising a mixer, a pressurizer, a heat exchanger, a heater and a pressure relief device, which constitute a liquid working medium circulation loop; the method uses the characteristics that the solubility of gas dissolved into liquid decreases with the increase of temperature and the heat transfer rate of liquid is higher than that of gas, and separates to form a heat exchange cycle at high temperature through rapid heat exchange by gas dissolution into liquid, so as to reduce the equipment volume and improve the heat exchange efficiency. In addition, the low-pressure gas working medium is dissolved in the low-pressure liquid working medium to form a liquid mixture; the pressurizer pressurizes the liquid mixture instead of directly pressurizing the gas working medium, and forms a high-pressure liquid mixture; the liquid working medium has the characteristics of small compression ratio and high compression efficiency compared with the gas working medium, so that the compression of the gas working medium is converted into the compression of the liquid working medium, and a new pressurization method is provided.

Description

Technical Field

[0001] This invention relates to the field of new energy, and in particular to a method for pressurized heat exchange based on changes in gas-liquid solubility. Background Technology

[0002] Renewable energy replacing fossil fuels has become an inevitable trend, with solar thermal systems, which possess energy storage capabilities, becoming a major force in renewable energy. Regarding the heat-to-electricity conversion process in solar thermal systems, based on common sense in thermodynamics, the heat absorbed during isothermal expansion is completely converted into mechanical energy. Using a closed-loop Brayton cycle two-dimensional engine system disclosed in Chinese Patent 2021101411788 and a near-isothermal double-expansion heat engine system disclosed in Chinese Patent 2022101333321, novel engine systems were established. However, two problems exist in the implementation of the Brayton cycle: First, the Brayton cycle does not involve a phase change and has no phase change temperature, resulting in a dispersed heat release that enables cascaded heat exchange and facilitates waste heat reuse. However, the gaseous working fluid has a large volume and lower heat transfer efficiency compared to liquids, which is not conducive to equipment miniaturization. Second, the Brayton cycle consumes a large proportion of the total power during compression, requiring stringent conditions for compressor manufacturing and operation, and demanding high precision in equipment manufacturing. For example, in a gas turbine, the compressor consumes 60% of the total power, and the compressor impeller requires high precision, is complex to manufacture, and has high maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas-liquid solubility change pressurization heat exchange method that facilitates equipment miniaturization, has low operating requirements and low maintenance costs, can achieve efficient pressurization of gas-liquid mixtures, reuse waste heat, and effectively improve energy conversion efficiency.

[0004] A method for pressurized heat exchange based on changes in gas-liquid solubility includes the following steps: 1. The mixer, pressurizer, heat exchanger, heater, and pressure relief device are connected sequentially through pipelines to form a liquid working fluid circulation loop; 2. The low-pressure gaseous working fluid dissolves in the low-pressure liquid working fluid in the mixer to form a low-pressure liquid mixture.

[0005] 3. The pressurizer pressurizes the liquid mixture and forms a high-pressure liquid mixture.

[0006] 4. The high-pressure liquid mixture enters the heat exchanger and heater successively to absorb heat, and the temperature gradually rises. It reaches the highest temperature in the heater, and the gas and liquid are separated.

[0007] 5. The high-pressure mixed working fluid undergoes gas-liquid separation in the heater. The high-temperature, high-pressure gaseous working fluid enters other cycles to perform work. The separated liquid working fluid transfers heat to the mixed working fluid through a heat exchanger, then enters a pressure relief device to release pressure, becoming a low-pressure state. It then re-enters the mixer to remix with the gaseous working fluid, completing the liquid working fluid pressurization and heat exchange cycle.

[0008] Furthermore, the gaseous working fluid dissolves in the liquid working fluid without releasing heat and exists in the liquid working fluid in a molecular state; The pressure relief device consists of a pressure relief valve, a pressure relief pipeline, and a buffer container; the pressurizer consists of a pressurizing pump and a liquid-driven pump; and the mixer consists of hydraulic cylinders. There are at least two hydraulic cylinders, each with a sliding piston inside. Inlet and outlet pipes are located at opposite ends of the cylinder. A pressure relief pipeline is located in the middle of the cylinder, and an air inlet pipeline is located in the lower middle part of the cylinder. The pressure relief pipeline is connected to the buffer container, allowing the depressurized liquid working medium to be temporarily stored within it. The buffer container is connected to the pressurizing pump via a pipeline, and the pressurizing pump is connected to a low-temperature, high-pressure liquid working medium pipeline. The liquid-driven pump provides assistance for the circulation of the liquid working medium.

[0009] Furthermore, the gaseous working fluid dissolves in the liquid working fluid exothermically and exists in a compound state; The pressure relief unit consists of a liquid water turbine, and the mixers are arranged in stages on the mixing heat exchanger. The pressurizer consists of a high-pressure liquid working fluid pump. The liquid water turbine coaxially drives the heat pump, which in turn drives the evaporator and condenser located before the liquid working fluid pump and heater to circulate the fluid through a refrigerant.

[0010] Furthermore, the heater is heated by an external heat source and has an internal heating device consisting of upper and lower layers of fins. The lower heating device provides the required temperature for gas-liquid separation, while the upper heating device further increases the temperature of the separated gaseous working fluid.

[0011] Furthermore, the heat exchanger is composed of a plate heat exchanger, which is installed before the heater to preheat the mixed working fluid and recover heat from the liquid working fluid after gas-liquid separation.

[0012] Furthermore, the pressurizer is positioned at the lowest temperature throughout the cycle, and the pressurization creates a temperature rise that does not exceed gas saturation.

[0013] The objective and beneficial effects of this invention are: This invention improves compression and heat exchange efficiency and reduces equipment size by dissolving the gaseous working fluid into the liquid working fluid. Its design is reasonable, simple, and ingenious, enabling pressurization and heat exchange of the gaseous working fluid and effectively improving energy conversion efficiency. This method utilizes the characteristic that the solubility of a gas in a liquid decreases with increasing temperature and that the heat transfer rate of a liquid is higher than that of a gas. Through rapid heat exchange by dissolving the gas into the liquid, separation occurs at high temperatures, forming a heat exchange cycle, thus reducing equipment size while improving heat exchange efficiency. Furthermore, by leveraging the lower compression ratio of the liquid working fluid compared to the gaseous working fluid and the higher compression efficiency of the liquid, the direct pressurization of the gaseous working fluid is converted into pressurization of the liquid gas-liquid mixture. This provides a new compression method that facilitates equipment miniaturization, has low operating requirements and low maintenance costs, enables efficient pressurization of gas-liquid mixtures, and allows for the reuse of waste heat from the gaseous working fluid, effectively improving energy conversion efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the basic operating principle of the pressurized heat exchange method based on gas-liquid solubility changes described in this invention. Figure 2 This is a schematic diagram of the principle of a gas-liquid solubility change pressurized heat exchange method according to the present invention (Example 1); Figure 3 This is a schematic diagram of the principle of the gas-liquid solubility change pressurized heat exchange method described in this invention, Example 2; Figure 4 This is a schematic diagram of the hydraulic cylinder in an embodiment of the gas-liquid solubility change pressurized heat exchange method described in this invention; Figure 5 This is a schematic diagram of the pressurizer structure in an embodiment of the gas-liquid solubility change pressurized heat exchange method described in this invention; Figure Labels Figure Labels 1-Mixer 2-Pressure Pressurizer 3-Heat Exchanger 4-Heater 5-Pressure Relief Device 6-Buffer Container 7-Hydraulic Cylinder 71-Hydraulic Cylinder A 72-Hydraulic Cylinder B 8-Pressure Pump 9-Liquid Drive Pump 10-Sliding Piston 11-Liquid Turbine 12-Heat Pump 13-Mixing Heat Exchanger 14-Liquid Working Fluid Pump 15-Evaporator 16-Condenser 17-Lower Heating Device 18-Upper Heating Device 19-High Temperature and High Pressure Gas Outlet 20-Liquid Working Fluid Inlet 21-Liquid Working Fluid Outlet 22-Mixing Heat Exchanger The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0015] Implementation Method 1 Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 The gas-liquid pressurized heat exchange method of the present invention includes the following steps: 1. Mixer 1, pressurizer 2, heat exchanger 3, heater 4 and pressure relief device 5 are connected sequentially through pipelines to form a liquid working medium circulation loop, so as to realize the continuous transport of the liquid working medium to the gas working medium; the gas working medium dissolves in the liquid working medium and its solubility decreases continuously as the temperature rises, which facilitates the dissolution of the gas working medium in the liquid at low temperature and the separation of the gas working medium from the liquid working medium at high temperature.

[0016] 2. The low-pressure gaseous working fluid dissolves in the low-pressure liquid working fluid in mixer 1, forming a low-pressure liquid mixture. This dissolution of the low-pressure gaseous working fluid in the low-pressure liquid working fluid allows the exhaust gas, after completing its work, to dissolve directly in the liquid working fluid without requiring additional mechanical work.

[0017] 3. The pressurizer 2 pressurizes the liquid mixture instead of directly pressurizing the gaseous working fluid, and forms a high-pressure liquid mixture.

[0018] 4. The high-pressure liquid mixture enters the heat exchanger 3 and heater 4 in succession to absorb heat and its temperature rises. It reaches the highest temperature in heater 4, where the gaseous working fluid that exceeds the saturation point separates from the liquid working fluid.

[0019] 5. The high-pressure mixed working fluid undergoes gas-liquid separation in heater 4. The gaseous working fluid has relatively low solubility in the liquid working fluid at high temperatures. Meanwhile, the liquid working fluid remains at a high temperature. Therefore, the separated liquid working fluid transfers heat to the mixed working fluid via heat exchanger 3. It then enters pressure relief device 5 to release pressure, becoming low-pressure, before re-entering mixer 1 to remix with the gaseous working fluid. This completes the cycle of pressurization and heat exchange, with the liquid working fluid carrying the gaseous working fluid, ultimately completing the pressurization and heat exchange of the gaseous working fluid.

[0020] The gaseous working medium dissolves in the liquid working medium without exothermic reaction and exists in a molecular state; the gaseous working medium mentioned here is such as ethane, and the liquid working medium is such as water. The pressure relief device 5 consists of a pressure relief valve, a pressure relief pipeline, and a buffer container 6; the pressure booster 2 consists of a pressure boosting pump 8 and a liquid-driven pump 9; and the mixer 1 consists of a hydraulic cylinder 7. The pressure relief valve, upon opening, releases pressure from the high-pressure liquid working medium, transforming it into a low-pressure liquid working medium. The pressure relief pipeline connects the pressure relief valve and the buffer container 6; the buffer container 6 temporarily stores the released liquid working medium. A sliding piston 10 is installed in the middle of the cylinder body of the hydraulic cylinder 7. The function of the sliding piston 10 is to separate the high-concentration liquid working medium and the low-concentration liquid working medium, and to facilitate pressure transmission. Inlet and outlet pipes are respectively installed at both ends of the cylinder body to facilitate the reciprocating transmission of liquid. The high-pressure liquid working medium enters from one end through the inlet pipe, pressurizing the low-pressure, high-concentration liquid working medium inside the hydraulic cylinder 7, turning it into a high-pressure liquid working medium, and then enters the system from the other end through the outlet pipe. A pressure relief valve is installed in the middle of the cylinder body to facilitate the release of pressure from the high-pressure, low-concentration liquid working medium inside the hydraulic cylinder 7. The air inlet pipe is located in the lower middle part of the cylinder body because gas has a lower density than liquid, facilitating the dissolution of the gaseous working medium in the liquid working medium from the bottom. The pressure relief pipe is connected to a buffer container 6, into which the depressurized liquid working medium is temporarily stored. The buffer container 6 is connected to a pressurization pump 8 through a pipe, and the pressurization pump 8 is connected to a low-temperature, high-pressure liquid working medium pipeline. The liquid-driven pump 9 provides assistance for the circulation of the liquid working medium. Among them, the booster pump 8 is a high-pressure pump, which mainly raises the pressure of the depressurized liquid working medium from low pressure to high pressure; the liquid drive pump 9 mainly provides assistance for circulation and is not a high-pressure pump.

[0021] A low-pressure gaseous working medium is introduced into the hydraulic cylinder 7 through an inlet pipe located at the bottom of the cylinder. It dissolves in the low-temperature liquid working medium within the cylinder, forming a liquid mixture. After the liquid mixture is formed, an inlet valve located at the other end of the hydraulic cylinder 7 opens. The high-pressure liquid working medium pushes the sliding piston 10, which in turn pushes the liquid mixture, first increasing the pressure. Then, the sliding piston 10 continues to push the liquid mixture into the circulation system. The sliding piston 10 moves to the end of the hydraulic cylinder 7 to complete the pushing action.

[0022] More specifically, the high-pressure mixed liquid working fluid entering the system first enters heat exchanger 3 to absorb heat. Heat exchanger 3 uses plate heat exchangers connected in series to gradually heat the mixed liquid working fluid, realizing the utilization of waste heat; then it enters heater 4 for further heating, reaching the highest temperature. Within the temperature range of heater 4, the solubility of the gas in the liquid is reduced to the minimum. Gas-liquid separation occurs, and the high-temperature, high-pressure gaseous working fluid is discharged from the outlet located at the top of heater 4 to enter other circulations to perform work. After gas-liquid separation, the concentration of the gaseous working fluid in the high-temperature, high-pressure liquid working fluid decreases, and then it enters heat exchanger 3 for cooling, transferring heat to the liquid working fluid with a high concentration of gaseous working fluid. The liquid working fluid is driven by liquid-liquid driven pump 9, entering hydraulic cylinder 7 to push sliding piston 10. Sliding piston 10 pushes the liquid working fluid on the other side of the piston, which has completed the gas-liquid mixing, pressurizing the mixed liquid working fluid; then it continues to push sliding piston 10, pushing the mixed liquid working fluid into the circulation system. At this time, sliding piston 10 has completely moved to the other end of hydraulic cylinder 7, and this process ends. At this point, the hydraulic cylinder 7 contains only a high-pressure liquid working medium, and the amount of dissolved gas in this liquid working medium is very low. The pressure relief valve then opens, releasing the pressure of the liquid working medium inside the cylinder, reducing its pressure to the same level as the low-pressure gas working medium. At this time, gas working medium is introduced into the hydraulic cylinder 7, where it mixes with the low-temperature liquid working medium to form a mixed liquid working medium. After the gas-liquid mixture is complete, the inlet valve on the other side of the hydraulic cylinder 7 opens, and the high-pressure liquid working medium pushes the sliding piston 10 in the reverse direction. The sliding piston 10 repeats this process, pressurizing the mixed liquid working medium and propelling it into the system.

[0023] Furthermore, after the high-pressure liquid working medium pushes the sliding piston 10, the pressure relief valve connected to the hydraulic cylinder 7 opens, releasing the pressure from the high-pressure liquid working medium inside the hydraulic cylinder 7. This depressurized portion of the liquid working medium enters the buffer container 6 for temporary storage, and then is repressurized by the high-pressure booster pump 8 before entering the pipeline before the liquid drive pump 9, becoming a high-pressure liquid working medium. This process replaces the original direct pressurization of the gaseous working medium with pressurization of the liquid working medium. Since the compressibility of the liquid working medium is much lower than that of the gaseous working medium, the pressurization efficiency of the liquid is higher than that of the gaseous working medium. This significantly reduces the amount of pressurization required and improves the conversion efficiency.

[0024] In addition, there are at least two hydraulic cylinders 7. When hydraulic cylinder A71 depressurizes and the gas and liquid mix, hydraulic cylinder B72 pushes the mixed liquid working medium into the system; similarly, when hydraulic cylinder B72 depressurizes and the gas and liquid mix, hydraulic cylinder A71 pushes the mixed liquid working medium into the system. These two hydraulic cylinders interact to complete the above process, continuously pushing the mixed liquid working medium into the system, achieving a continuous cycle.

[0025] Furthermore, the heater 4 is heated by an external heat source and has an internal heating device consisting of upper and lower layers of fins. The lower heating device 17 provides the required temperature for gas-liquid separation, and the upper heating device 18 further increases the temperature of the separated gas working fluid.

[0026] Furthermore, the heat exchanger 3 is composed of a plate heat exchanger and is installed before the heater 4 to preheat the mixed working fluid and recover heat from the liquid working fluid after gas-liquid separation.

[0027] Furthermore, the pressurizer 2 is positioned at the lowest temperature throughout the entire cycle, and the temperature rise caused by pressurization does not exceed the saturation state of the gas.

[0028] Example 2: Reference Figure 1 , Figure 3 , Figure 4 and Figure 5 The gas-liquid pressurized heat exchange method of the present invention includes the following steps: 1. Mixer 1, pressurizer 2, heat exchanger 3, heater 4 and pressure relief device 5 are connected sequentially through pipelines to form a liquid working medium circulation loop, so as to realize the continuous transport of the liquid working medium to the gas working medium; the gas working medium dissolves in the liquid working medium and its solubility decreases continuously as the temperature rises, which facilitates the dissolution of the gas working medium in the liquid at low temperature and the separation of the gas working medium from the liquid working medium at high temperature.

[0029] 2. The low-pressure gaseous working fluid dissolves in the low-pressure liquid working fluid in mixer 1, forming a low-pressure liquid mixture. This dissolution of the low-pressure gaseous working fluid in the low-pressure liquid working fluid allows the exhaust gas, after completing its work, to dissolve directly in the liquid working fluid without requiring additional mechanical work.

[0030] 3. The pressurizer 2 pressurizes the liquid mixture instead of directly pressurizing the gaseous working fluid, and forms a high-pressure liquid mixture.

[0031] 4. The high-pressure liquid mixture enters the heat exchanger 3 and heater 4 in succession to absorb heat and its temperature rises. It reaches the highest temperature in heater 4, where the gaseous working fluid that exceeds the saturation point separates from the liquid working fluid.

[0032] 5. The high-pressure mixed working fluid undergoes gas-liquid separation in heater 4. The gaseous working fluid has relatively low solubility in the liquid working fluid at high temperatures. Meanwhile, the liquid working fluid remains at a high temperature. Therefore, the separated liquid working fluid transfers heat to the mixed working fluid via heat exchanger 3. It then enters pressure relief device 5 to release pressure, becoming low-pressure, before re-entering mixer 1 to remix with the gaseous working fluid. This completes the cycle of pressurization and heat exchange, with the liquid working fluid carrying the gaseous working fluid, ultimately completing the pressurization and heat exchange of the gaseous working fluid.

[0033] The gaseous working medium dissolves in the liquid, releasing heat, and exists in a compound state. Examples of gaseous working media include carbon dioxide, and examples of liquid working media include water. The pressure relief device 5 consists of a liquid turbine 11. Since the pressure released is relatively stable at both high and low pressures, and the working fluid is liquid, a water turbine offers the highest conversion efficiency. The mixer 1 is installed in stages on the mixing heat exchanger 13, which consists of multiple plate heat exchangers connected in series. Each plate heat exchanger has a pipeline for introducing the gaseous working fluid, allowing the gaseous and liquid working fluids to dissolve in the liquid in stages. The heat released during the gas-liquid mixing process is also easily recovered stage by stage. The pressurizer 2 consists of a high-pressure liquid working fluid pump 14, which directly boosts the pressure of the low-pressure, high-concentration liquid working fluid to high pressure. The liquid turbine 11 coaxially drives the heat pump 12. The heat pump 12 drives the evaporator 15 and the condenser 16 located before the liquid working fluid pump 14 and the heater 4 through the refrigerant to recover heat. The heat pump 12 drives the refrigerant, which vaporizes and absorbs heat in the evaporator 15 and liquefies and releases heat in the condenser 16, transferring heat from the low temperature to the high temperature.

[0034] More specifically, in this embodiment, carbon dioxide is used as the gaseous working medium, and water is used as the liquid working medium. The minimum operating pressure of the gas is selected above the supercritical state of the gaseous working medium. The gas-liquid mixture is pressurized to a high-pressure state by the high-pressure liquid working medium pump 14. The high-pressure liquid working medium first passes through the mixing heat exchanger 13, absorbing the heat released when the gaseous and liquid working media are mixed. Then it enters the heat exchanger 3 to absorb the heat released by the high-temperature liquid working medium, gradually increasing its temperature. Finally, it enters the heater 4 to reach the highest temperature, where the concentration of the gaseous working medium in the liquid is the lowest, and most of the gas separates from the liquid. Then, the high-temperature liquid working medium re-enters the heat exchanger 3 to release heat, and is converted from high pressure to low pressure by the hydraulic turbine, converting the pressure potential energy into the mechanical energy of the hydraulic turbine. Then, the low-pressure liquid working medium enters the mixing heat exchanger 13 and mixes with the gaseous working medium in stages to form a new liquid mixture, which then enters the evaporator 15 for further cooling. The cooled mixture is pressurized by the high-pressure liquid working medium pump 14 to form a high-pressure mixed liquid working medium.

[0035] The high-pressure liquid working fluid drives the liquid turbine to do work. The heat pump 12, which is coaxially connected to the liquid turbine, drives the refrigerant to evaporate and absorb heat in the evaporator 15, and liquefy and release heat in the condenser 16, realizing the transfer of heat from low temperature to high temperature, mainly to complete the reuse of waste heat.

[0036] This specific embodiment clearly illustrates the principles and methods of the present invention. Based on the principle that the solubility of gas in liquid decreases with increasing temperature and that the heat exchange rate of liquid is higher than that of gas, the present invention is invented by using liquid to carry gas and separating it at high temperature. The present invention replaces the current method of directly pressurizing the gas working medium by using liquid, which has much lower compressibility than gas, to mix gas and liquid under low pressure, and then pressurizing the depressurized liquid by pressurizing pump 89. This reduces the amount of compression, improves the compression efficiency, and has a novel compression method.

[0037] Furthermore, the heater 4 is heated by an external heat source and has an internal heating device consisting of upper and lower layers of fins. The lower heating device 17 provides the required temperature for gas-liquid separation, and the upper heating device 18 further increases the temperature of the separated gas working fluid.

[0038] Furthermore, the heat exchanger 3 is composed of a plate heat exchanger and is installed before the heater 4 to preheat the mixed working fluid and recover heat from the liquid working fluid after gas-liquid separation.

[0039] Furthermore, the pressurizer 2 is positioned at the lowest temperature throughout the entire cycle, and the temperature rise caused by pressurization does not exceed the saturation state of the gas.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for pressurized heat exchange based on changes in gas-liquid solubility, comprising the following steps: S1. The mixer, pressurizer, heat exchanger, heater, and pressure relief device are connected sequentially through pipelines to form a liquid working fluid circulation loop; S2. The low-pressure gaseous working fluid dissolves in the low-pressure liquid working fluid in the mixer to form a low-pressure liquid mixture; S3. The pressurizer pressurizes the liquid mixture and forms a high-pressure liquid mixture; S4. The high-pressure liquid mixture enters the heat exchanger and heater successively to absorb heat, and the temperature gradually rises. It reaches the highest temperature in the heater, and the gas and liquid are separated. S5. The high-pressure mixed working fluid undergoes gas-liquid separation in the heater. The high-temperature, high-pressure gaseous working fluid enters other cycles to perform work. The separated liquid working fluid transfers heat to the mixed working fluid through a heat exchanger, then enters a pressure relief device to release pressure, becoming a low-pressure state. It then re-enters the mixer to remix with the gaseous working fluid, completing the liquid working fluid pressurization and heat exchange cycle.

2. The gas-liquid solubility change pressurized heat exchange method according to claim 1, characterized in that, The gaseous working fluid dissolves in the liquid working fluid without releasing heat and exists in the liquid working fluid in a molecular state; The pressure relief device consists of a pressure relief valve, a pressure relief pipeline, and a buffer container; the pressurizer consists of a pressurizing pump and a liquid-driven pump; and the mixer consists of a hydraulic cylinder. The hydraulic cylinder comprises at least two cylinders, each with a sliding piston inside. An inlet pipe and an outlet pipe are located at opposite ends of the cylinder. A pressure relief pipe is positioned in the middle of the cylinder, and an air inlet pipe is located in the lower middle section of the cylinder. The pressure relief pipe is connected to a buffer container, into which the depressurized liquid working fluid is temporarily stored. The buffer container is connected to a pressurizing pump via a pipe, and the pressurizing pump is connected to a low-temperature, high-pressure liquid working fluid pipeline. The liquid-driven pump provides assistance for the circulation of the liquid working fluid.

3. The gas-liquid solubility change pressurized heat exchange method according to claim 1, characterized in that, The gaseous working medium dissolves in the liquid, releasing heat, and exists in a compound state. The pressure relief device consists of a liquid water turbine, the mixer is arranged in stages on the mixing heat exchanger, and the pressurizer consists of a high-pressure liquid working fluid pump; the liquid water turbine coaxially drives the heat pump, and the heat pump drives the evaporator and the condenser arranged in front of the liquid working fluid pump and the heater to circulate through the refrigerant.

4. The gas-liquid solubility change pressurized heat exchange method according to claim 1, characterized in that, The heater is heated by an external heat source and has an internal heating device consisting of upper and lower layers of fins. The lower heating device provides the required temperature for gas-liquid separation, while the upper heating device further increases the temperature of the separated gas working fluid.

5. The gas-liquid solubility change pressurized heat exchange method according to claim 1, characterized in that, The heat exchanger consists of a plate heat exchanger, which is installed before the heater to preheat the mixed working fluid and recover heat from the liquid working fluid after gas-liquid separation.

6. The gas-liquid solubility change pressurized heat exchange method according to claim 1, characterized in that, The pressurizer is positioned at the lowest temperature throughout the cycle, and the temperature rise caused by pressurization does not exceed the saturation state of the gas.

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