Temperature control system for displacement experiment device, displacement experiment system and temperature control method

Abstract

The invention relates to the technical field of oil and gas field development, and discloses a temperature control system for a displacement experiment device, a displacement experiment system and a temperature control method. The temperature control system comprises a heat exchange assembly arranged in the displacement experiment device, cooling equipment communicated with the heat exchange assembly, an energy conversion module connected between the heat exchange assembly and the cooling equipment, and gas-liquid separation equipment arranged at the downstream of the cooling equipment. According to the technical scheme, liquid carbon dioxide exchanges heat with the heat-conducting medium in the displacement experiment device in the heat exchange assembly, and is converted into supercritical carbon dioxide; after the supercritical carbon dioxide enters the energy conversion module, at least part of heat energy can be converted into mechanical energy so as to drive the carbon dioxide to circularly flow in the temperature control system; and then the carbon dioxide enters cooling equipment to be further cooled, and carbon dioxide in a gas-liquid mixed state is formed. According to the invention, the unique property of the transcritical state of carbon dioxide is utilized, so that the refrigeration efficiency is higher, and the energy-saving effect can be improved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, specifically to a temperature control system for a displacement experimental apparatus. Furthermore, it relates to a displacement experimental system and a temperature control method. Background Technology

[0002] Physical displacement simulation experiments are a primary method for evaluating the seepage characteristics of oil and gas in formations. To simulate the high-temperature and high-pressure conditions of oil reservoirs, a heat transfer medium, such as heat transfer oil, is typically injected into the experimental device and heated to the formation temperature. After the physical displacement simulation experiment concludes, the heat transfer oil needs to be drained to release pressure. However, at the end of the physical displacement simulation experiment, the heat transfer oil in the experimental device remains at a high temperature. Especially in large-scale physical simulation experiments, due to the large volume and high specific heat coefficient of the heat transfer oil, directly opening the experimental device to release pressure would cause the high-temperature heat transfer oil to rapidly heat the air in the laboratory and increase the temperature, potentially scalding experimental personnel and posing a significant safety hazard. Therefore, it is urgent to configure a corresponding cooling system to achieve rapid cooling of the heat transfer oil.

[0003] Currently, the common method for cooling in laboratories is through ventilation equipment, which uses electricity to accelerate airflow and expel hot air from the laboratory. However, this method has several drawbacks. First, the cooling effect is very limited and the cooling speed is slow. Second, the cooling process consumes a large amount of electricity. Moreover, directly expelling hot air from the laboratory poses safety hazards, and the lack of heat recovery during the experiment also results in a certain degree of resource waste. Summary of the Invention

[0004] The purpose of this invention is to overcome the technical problem that the cooling effect and efficiency of the prior art are relatively limited, and to provide a temperature control system, a displacement experiment system and a temperature control method for a displacement experiment device. This temperature control system can improve the cooling effect and efficiency.

[0005] To achieve the above objectives, a first aspect of the present invention provides a temperature control system for a displacement experimental apparatus, comprising: a heat exchange component disposed within the displacement experimental apparatus and configured to convert liquid carbon dioxide in the heat exchange component into a supercritical state by exchanging heat with a heat-conducting medium in the displacement experimental apparatus; a cooling device connected to the heat exchange component for cooling carbon dioxide from the heat exchange component to form a gas-liquid mixture of carbon dioxide; an energy conversion module connected between the heat exchange component and the cooling device and configured to convert at least a portion of the thermal energy of the carbon dioxide from the heat exchange component into mechanical energy to drive the carbon dioxide to flow between the heat exchange component and the cooling device; and a gas-liquid separation device disposed downstream of the cooling device for separating the gas-liquid mixture of carbon dioxide from the cooling device to form liquid carbon dioxide for flowing into the heat exchange component and gaseous carbon dioxide for flowing back to the cooling device.

[0006] The temperature control system for a displacement experimental apparatus provided by this invention utilizes the cooperation of heat exchange components, cooling equipment, an energy conversion module, and a gas-liquid separation device to allow carbon dioxide to circulate within the system. Liquid carbon dioxide exchanges heat with the heat-conducting medium in the displacement experimental apparatus within the heat exchange components, causing the medium's temperature to decrease while the carbon dioxide's temperature increases. When the carbon dioxide temperature exceeds its critical temperature, the liquid carbon dioxide transforms into supercritical carbon dioxide. After entering the energy conversion module, at least a portion of the supercritical carbon dioxide's thermal energy is converted into mechanical energy, which drives the carbon dioxide to circulate within the temperature control system. Subsequently, the carbon dioxide enters the cooling equipment for further cooling, forming a gas-liquid mixture. Therefore, the temperature control system provided by this invention utilizes the unique transcritical properties of carbon dioxide, resulting in higher refrigeration efficiency. Furthermore, by converting a portion of the carbon dioxide's thermal energy into mechanical energy through the energy conversion module, and using this mechanical energy to drive the carbon dioxide's circulation within the temperature control system, the system's energy consumption can be reduced, improving energy efficiency. Simultaneously, carbon dioxide is an environmentally friendly and harmless cooling medium that will not have a negative impact on the environment. Furthermore, a gas-liquid separation device is installed downstream of the cooling equipment to separate the gas-liquid mixture of carbon dioxide into liquid carbon dioxide and gaseous carbon dioxide. The gaseous carbon dioxide flows back to the cooling equipment for further cooling and liquefaction, while the liquid carbon dioxide flows into the heat exchange components for heat exchange. Compared with the heat absorbed by carbon dioxide when it is converted from a gaseous state or a gas-liquid mixture to a supercritical state, carbon dioxide absorbs more heat when it is converted from a liquid state to a supercritical state. Therefore, by installing a gas-liquid separation device, the refrigeration efficiency of carbon dioxide can be further improved.

[0007] Optionally, the energy conversion module includes a booster turbine for receiving at least a portion of the carbon dioxide from the heat exchange assembly and converting at least a portion of the thermal energy of the carbon dioxide into mechanical energy, and a first booster device for compressing the carbon dioxide, which is drivenly connected to the booster turbine, wherein the carbon dioxide in the first booster device is configured to flow toward the cooling device or the heat exchange assembly.

[0008] Optionally, the booster turbine, the first booster device, the cooling device, and the gas-liquid separation device are connected in sequence, so that carbon dioxide is compressed in the first booster device and then enters the cooling device for cooling.

[0009] Optionally, the booster turbine, the cooling device, the gas-liquid separation device, and the first booster device are connected in sequence, so that the carbon dioxide is cooled in the cooling device and then enters the first booster device for compression.

[0010] Optionally, the energy conversion module further includes a second booster device connected to the booster turbine drive. The second booster device is connected to the cooling device and the gas-liquid separation device respectively, for compressing gaseous carbon dioxide from the gas-liquid separation device and delivering it to the cooling device.

[0011] Optionally, the energy conversion module further includes a power generation turbine for receiving another portion of the carbon dioxide from the heat exchange assembly and converting at least a portion of the thermal energy of the carbon dioxide into mechanical energy, a generator connected to the power generation turbine for converting the mechanical energy generated by the power generation turbine into electrical energy, and a battery pack electrically connected to the generator.

[0012] Optionally, the energy conversion module further includes a flow distributor disposed upstream of the booster turbine and the power generation turbine, the flow distributor being configured to regulate the flow rate of carbon dioxide delivered to the booster turbine and the power generation turbine, respectively.

[0013] A second aspect of the present invention provides a displacement experimental system, including a displacement experimental apparatus and the temperature control system described above, wherein the displacement experimental apparatus includes an experimental apparatus housing, a cover sealed to the experimental apparatus housing, and a heating device disposed within the experimental apparatus housing for heating the heat-conducting medium, and the heat exchange component is disposed within the experimental apparatus housing.

[0014] Optionally, the displacement experimental system provided by the present invention further includes a protective cover, wherein the displacement experimental device is disposed inside the protective cover and the cooling device is disposed outside the protective cover.

[0015] A third aspect of the present invention provides a temperature control method for a displacement experimental system, the temperature control method using the above-described displacement experimental system, comprising the following steps, but not necessarily in the following order: In the displacement experimental apparatus, a heat-conducting medium at a first predetermined temperature exchanges heat with liquid carbon dioxide, and the carbon dioxide is converted from a gaseous state to a supercritical state. The carbon dioxide is allowed to flow into the cooling device to lower its temperature and form a gas-liquid mixture of carbon dioxide. The gas-liquid mixture of carbon dioxide is separated into liquid and gaseous states, with the liquid carbon dioxide flowing into the heat exchange component and the gaseous carbon dioxide flowing into the cooling device.

[0016] Optionally, the temperature control method provided by the present invention further includes the following steps: The heat-conducting medium is injected into the displacement experimental device; The heat-conducting medium is heated to the first predetermined temperature at a predetermined rate; Maintain the temperature of the heat-conducting medium at the first predetermined temperature. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one embodiment of the temperature control system provided by the present invention; Figure 2 It is carbon dioxide in Figure 1 The diagram shows the state transitions in the temperature control system. Figure 3 yes Figure 1 The TS diagram of the temperature control system is shown below; Figure 4 This is a schematic diagram of another embodiment of the temperature control system provided by the present invention; Figure 5 It is carbon dioxide in Figure 4 The diagram shows the state transitions in the temperature control system. Figure 6 yes Figure 4 The TS diagram of the temperature control system is shown.

[0018] Explanation of reference numerals in the attached figures 1-Experimental apparatus shell; 2-Cover; 3-Temperature sensor; 4-Heating equipment; 5-Heat exchange assembly; 6-Flow distributor; 7-Power generation turbine; 8-Generator; 9-Battery pack; 10-Pressure booster turbine; 11-First pressure booster; 12-Second pressure booster; 13-Cooling equipment; 14-Gas-liquid separation equipment; 15-Protective cover. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] In this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The embodiments of the temperature control system, displacement experimental system, and temperature control method for the displacement experimental apparatus provided by the present invention are described in detail below with reference to the accompanying drawings.

[0025] The first aspect of the present invention provides a temperature control system for a displacement experimental apparatus, referring to... Figure 1 and Figure 4 As shown, the temperature control system includes: a heat exchange component 5 disposed within the displacement experimental apparatus, wherein carbon dioxide flows through the heat exchange component 5, and the heat exchange component 5 is configured to allow the liquid carbon dioxide within it to exchange heat with a heat-conducting medium, such as heat transfer oil, in the displacement experimental apparatus, thereby causing the carbon dioxide to transform from a liquid state to a supercritical state; a cooling device 13 connected to the heat exchange component 5, which can be used to cool the carbon dioxide from the heat exchange component 5 and form a gas-liquid mixture of carbon dioxide; and an energy conversion module connected between the heat exchange component 5 and the cooling device 13, which is configured to convert the carbon dioxide from the heat exchange component 5 into a supercritical state. At least a portion of the thermal energy of the carbon dioxide is converted into mechanical energy to drive the carbon dioxide to flow between the heat exchange assembly 5 and the cooling device 13; and a gas-liquid separation device 14 is disposed downstream of the cooling device 13, which can be used to separate the gas-liquid mixed carbon dioxide from the cooling device 13 and form liquid carbon dioxide and gaseous carbon dioxide respectively. The liquid carbon dioxide is used to flow into the heat exchange assembly 5 and exchange heat with the heat-conducting medium in the displacement experimental device. The gaseous carbon dioxide is used to flow back to the cooling device 13 for further cooling and liquefaction, and then enter the gas-liquid separation device 14 again for gas-liquid separation.

[0026] Through the above technical solution, carbon dioxide can circulate among the heat exchange component 5, the energy conversion module, the cooling device 13, and the gas-liquid separation device 14. Furthermore, the liquid carbon dioxide exchanges heat with the heat-conducting medium in the displacement experimental device within the heat exchange component 5, causing the temperature of the heat-conducting medium to decrease while the temperature of the carbon dioxide increases. When the temperature of the carbon dioxide exceeds its critical temperature, the liquid carbon dioxide transforms into supercritical carbon dioxide. After entering the energy conversion module, at least a portion of the thermal energy of the supercritical carbon dioxide can be converted into mechanical energy, which drives the carbon dioxide to circulate within the temperature control system. Subsequently, the carbon dioxide enters the cooling device 13 for further cooling, forming a gas-liquid mixture of carbon dioxide. Therefore, the temperature control system provided by this invention utilizes the unique properties of carbon dioxide in its transcritical state, resulting in higher refrigeration efficiency. Furthermore, by converting a portion of the thermal energy of the carbon dioxide into mechanical energy through the energy conversion module, and using this mechanical energy to drive the circulation of carbon dioxide within the temperature control system, the energy consumption of the temperature control system can be reduced, improving energy efficiency. Simultaneously, carbon dioxide is an environmentally friendly and harmless cooling medium that will not have a negative impact on the environment. Furthermore, a gas-liquid separation device 14 is installed downstream of the cooling device 13 to separate the gas-liquid mixture of carbon dioxide into liquid carbon dioxide and gaseous carbon dioxide. The gaseous carbon dioxide flows back to the cooling device 13 for further cooling and liquefaction, while the liquid carbon dioxide flows into the heat exchange component 5 for heat exchange. Compared to the heat absorbed by carbon dioxide when it transforms from a gaseous or gas-liquid mixture into a supercritical state, carbon dioxide absorbs more heat when it transforms from a liquid to a supercritical state. Therefore, by installing the gas-liquid separation device 14, the cooling efficiency of carbon dioxide can be further improved. The temperature control system of the present invention, by circulating carbon dioxide, allows the carbon dioxide to exchange heat with the heat transfer medium in the displacement experimental device multiple times, which can quickly reduce the temperature of the heat transfer medium to a predetermined temperature, thereby safely opening the displacement experimental device.

[0027] Optionally, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the energy conversion module includes a booster turbine 10 for receiving at least a portion of carbon dioxide from the heat exchange assembly 5 and converting at least a portion of the thermal energy of the carbon dioxide into mechanical energy, and a first booster device 11 for compressing the carbon dioxide, which is driven to the booster turbine 10. The carbon dioxide in the first booster device 11 is configured to flow toward the cooling device 13 or the heat exchange assembly 5. Thus, supercritical carbon dioxide flows out of the heat exchange assembly 5 and into the booster turbine 10. The supercritical carbon dioxide expands and does work within the booster turbine 10, converting into gaseous carbon dioxide, which drives the booster turbine 10 to operate. The first booster device 11 (e.g., a compressor or booster pump) is driven to the booster turbine 10, so when the booster turbine 10 operates, it drives the first booster device 11 to work, thereby compressing the carbon dioxide and providing power for the circulation of carbon dioxide in the temperature control system of the present invention. Thus, while the carbon dioxide is converted from a supercritical state to a gaseous state within the booster turbine 10, at least a portion of the thermal energy is converted into mechanical energy.

[0028] Optionally, refer to Figure 1 and Figure 4 As shown, the energy conversion module also includes a second pressurizing device 12 (e.g., a compressor or a booster pump) connected to the booster turbine 10. The second pressurizing device 12 is connected to both the cooling device 13 and the gas-liquid separation device 14 to compress gaseous carbon dioxide from the gas-liquid separation device 14 and then deliver it to the cooling device 13. Using the second pressurizing device 12 to pressurize the gaseous carbon dioxide before delivering it to the cooling device 13 facilitates carbon dioxide liquefaction, thereby further reducing cooling energy consumption.

[0029] Specifically, the booster turbine 10 has a central drive shaft, which is connected to the first booster device 11 and the second booster device 12 respectively. Supercritical carbon dioxide enters the booster turbine 10, expands and does work, driving the central drive shaft to rotate, thereby driving the first booster device 11 and the second booster device 12 to operate.

[0030] Optionally, refer to Figures 1 to 6As shown, according to an embodiment of the temperature control system of the present invention, gaseous carbon dioxide flowing out of the booster turbine 10 can first enter the cooling device 13 for cooling and cooling to form a gas-liquid mixture of carbon dioxide. This gas-liquid mixture of carbon dioxide is then separated into liquid carbon dioxide and gaseous carbon dioxide by the gas-liquid separator 14. The liquid carbon dioxide is then compressed by the first booster device 11 and enters the heat exchange assembly 5 to exchange heat with the heat transfer medium. Alternatively, the gaseous carbon dioxide flowing out of the booster turbine 10 can first enter the first booster device 11 for compression into supercritical carbon dioxide, and then enter the cooling device 13 for cooling and cooling to form a gas-liquid mixture of carbon dioxide. This gas-liquid mixture of carbon dioxide is then separated into liquid carbon dioxide and gaseous carbon dioxide by the gas-liquid separator 14, and the liquid carbon dioxide flows into the heat exchange assembly 5.

[0031] Specifically, according to one embodiment of the present invention, in combination with Figures 1 to 3 As shown, the liquid carbon dioxide in heat exchange component 5 exchanges heat with the heat-conducting medium in the displacement experimental device, causing the temperature of the liquid carbon dioxide to rise. When the temperature exceeds the critical temperature (31.2℃), the carbon dioxide transforms from a liquid state to a supercritical state, combining... Figure 3 As shown, Figure 3 Curve A1 represents the process of carbon dioxide exchanging heat with the heat transfer medium and transforming from a liquid state to a supercritical state. After flowing out of heat exchange component 5, the supercritical carbon dioxide enters the pressurized turbine 10, expanding and driving the central drive shaft of the pressurized turbine 10 to rotate. As the carbon dioxide continuously performs work within the pressurized turbine 10, its thermal energy is continuously converted into mechanical energy, causing its temperature to decrease and transforming it from a supercritical state to a gaseous state. Figure 3 As shown, Figure 3 Curve A2 represents the process of carbon dioxide driving the booster turbine 10 and converting it from a supercritical state to a gaseous state. The gaseous carbon dioxide flowing out of the booster turbine 10 enters the cooling device 13 for cooling and cooling, forming a gas-liquid mixture of carbon dioxide. This gas-liquid mixture is separated into liquid and gaseous carbon dioxide by the gas-liquid separator 14. The liquid carbon dioxide is compressed by the first booster device 11 and then enters the heat exchange assembly 5 to exchange heat with the heat transfer medium. The gaseous carbon dioxide can be compressed by the second booster device 12 and then flow back to the cooling device 13 for further cooling and liquefaction. Figure 3 As shown, Figure 3Curve A3 represents the process by which carbon dioxide from the booster turbine 10 enters the cooling device 13, transforms from a gaseous state to a gas-liquid mixture, and is then separated by the gas-liquid separator 14 to form liquid carbon dioxide. Curve A4' represents the process by which the gaseous carbon dioxide separated by the gas-liquid separator 14 enters the second booster device 12 for compression. Curve A3' represents the process by which the carbon dioxide flows back from the second booster device to the cooling device 13 for further liquefaction. Curve A4 represents the process by which the liquid carbon dioxide flowing out of the gas-liquid separator 14 enters the first booster device 11 for pressurization.

[0032] According to another embodiment of the present invention, combined with Figures 4 to 6 As shown, the liquid carbon dioxide in heat exchange component 5 exchanges heat with the heat-conducting medium in the displacement experimental device, causing the temperature of the liquid carbon dioxide to rise. When the temperature exceeds the critical temperature (31.2℃), the carbon dioxide transforms from a liquid state to a supercritical state, combining... Figure 6 As shown, Figure 6 Curve B1 represents the process of carbon dioxide exchanging heat with the heat transfer medium and transforming from a liquid state to a supercritical state. After flowing out of heat exchange component 5, the supercritical carbon dioxide enters the pressurized turbine 10, expanding and driving the central drive shaft of the pressurized turbine 10 to rotate. As the carbon dioxide continuously performs work within the pressurized turbine 10, its thermal energy is continuously converted into mechanical energy, causing its temperature to decrease and transforming it from a supercritical state to a gaseous state. Figure 3 As shown, Figure 3 Curve B2 represents the process of carbon dioxide driving the booster turbine 10 and transforming it from a supercritical state to a gaseous state; this process involves isentropic work. Gaseous carbon dioxide flowing from the booster turbine 10 enters the first booster unit 11 for pressurization and compression, forming supercritical carbon dioxide. Since supercritical carbon dioxide has a much better flow capacity than gaseous and liquid carbon dioxide, first compressing the gaseous carbon dioxide into supercritical carbon dioxide through the first booster unit 11 can improve the heat dissipation efficiency of the cooling device 13 and accelerate the cooling of the carbon dioxide; combined with... Figure 3 As shown, Figure 3 Curve B3 represents the process by which carbon dioxide from the booster turbine 10 is compressed in the first booster unit 11 and transformed from a gaseous state to a supercritical state. The supercritical carbon dioxide flowing out of the first booster unit 11 enters the cooling unit 13 for cooling and temperature reduction, forming a gas-liquid mixture of carbon dioxide. This carbon dioxide undergoes gas-liquid separation in the gas-liquid separator 14, forming liquid carbon dioxide and gaseous carbon dioxide. The liquid carbon dioxide enters the heat exchange assembly 5 for heat exchange with the heat transfer medium. The gaseous carbon dioxide can be compressed by the second booster unit 12 and then returned to the cooling unit 13 for further cooling and liquefaction. Figure 3 As shown, Figure 3 Curve B4 represents the process by which carbon dioxide from the first booster 11 enters the cooling device 13 and is transformed from a supercritical state into a gas-liquid mixture.

[0033] In addition, combined Figure 3 and Figure 6 As shown, Figure 3 The area enclosed by curves A1, A2, A3, and A4 is greater than Figure 6 The area enclosed by curves B1 to B4 represents the energy conversion efficiency of sequentially connecting the booster turbine 10, cooling device 13, gas-liquid separator 14, and first booster device 11 in the two aforementioned embodiments. This energy conversion efficiency is greater than that of sequentially connecting the booster turbine 10, first booster device 11, cooling device 13, and gas-liquid separator 14. As mentioned earlier, carbon dioxide is first pressurized by the first booster device 11, changing from a gaseous state to a supercritical state, and then enters the cooling device 13 for cooling. This is beneficial for improving the cooling rate. Therefore, the connection relationship between the booster turbine 10, first booster device 11, cooling device 13, and gas-liquid separator 14 can be adjusted according to the actual cooling and energy conversion requirements to obtain the embodiment with the best cooling effect or energy conversion efficiency.

[0034] Optionally, refer to Figure 1 and Figure 4 As shown, the energy conversion module also includes a power generation turbine 7 for receiving another portion of carbon dioxide from the heat exchange component 5 and converting at least a portion of the thermal energy of the carbon dioxide into mechanical energy; a generator 8, driven by the power generation turbine 7 and used to convert the mechanical energy generated by the power generation turbine 7 into electrical energy; and a battery pack 9 electrically connected to the generator 8. Specifically, supercritical carbon dioxide flows out of the heat exchange component 5 and splits into at least two branches. One branch enters the booster turbine 10, and the other branch enters the power generation turbine 7. The supercritical carbon dioxide entering the power generation turbine 7 expands rapidly and drives the power generation turbine 7 to operate, while simultaneously converting from a supercritical state to a gaseous state. The generator 8 is driven by the power generation turbine 7, so when the power generation turbine 7 operates, it drives the generator 8 to work, converting the mechanical energy generated by the power generation turbine 7 into electrical energy. The generator 8 is electrically connected to the battery pack 9, which can store the electrical energy generated by the generator 8, thereby further recovering the thermal energy generated during the displacement experiment.

[0035] Furthermore, referring to Figure 1 and Figure 4As shown, the energy conversion module also includes a flow distributor 6 located upstream of the booster turbine 10 and the power generation turbine 7. The flow distributor 6 is configured to regulate the flow rate of carbon dioxide delivered to the booster turbine 10 and the power generation turbine 7, respectively. In one embodiment, the flow distributor 6 may include two branch pipes, each equipped with a regulating valve. The outlets of the two branch pipes are respectively connected to the booster turbine 10 and the power generation turbine 7, and pressure sensors are installed at each of the two outlets. By detecting the pressure data from the pressure sensors, the regulating valves are controlled to adjust the flow rate of carbon dioxide delivered to the booster turbine 10 and the power generation turbine 7, respectively. Therefore, by setting the flow distributor 6, it is ensured that the carbon dioxide flowing out of the heat exchange component 5 is preferentially delivered to the booster turbine 10, so that the carbon dioxide can be rapidly cooled and circulated. After ensuring that the booster turbine 10 can operate normally, a portion of the carbon dioxide is diverted and delivered to the power generation turbine 7, thereby converting the excess heat energy of the carbon dioxide into electrical energy for further energy recovery.

[0036] A second aspect of the present invention provides a displacement experimental system, referring to Figure 1 and Figure 4 As shown, the displacement experimental system includes a displacement experimental device and the aforementioned temperature control system. The displacement experimental device includes an experimental device housing 1, a cover 2 sealed to the experimental device housing 1, and a heating device 4 for heating the heat-conducting medium disposed inside the experimental device housing 1. The heat exchange component 5 is disposed inside the experimental device housing 1.

[0037] Specifically, in combination Figure 1 and Figure 4 As shown, the experimental device housing 1 and cover 2 are connected by an O-ring seal. The cover 2 is equipped with a watertight connector and a perforation hole. A temperature sensor 3 is also installed inside the experimental device housing 1. The signal line of the temperature sensor 3 can be connected to a control mechanism outside the experimental device housing 1 via the watertight connector. The heat exchange assembly 5 may include heat sinks and a coil surrounded by metal pipes. Carbon dioxide flows inside the coil. The coil inlet is located at the lower part of the coil, and the coil outlet is located at the upper part of the coil. The coil outlet is connected to a first pipeline, which passes through the perforation hole on the cover 2 and connects to the inlet of the flow distributor 6. A first valve is installed on this first pipeline. The coil inlet is connected to a second pipeline, which passes through the perforation hole on the cover 2 and connects to the outlet of the gas-liquid separator 14 or the outlet of the first pressurizing device 11. A second valve and a check valve are installed on this second pipeline.

[0038] Optionally, the heating device 4 is an electric heating wire, and the power supply wire of the electric heating wire is connected to the control mechanism outside the experimental device housing 1 through a water-sealed connector.

[0039] Optionally, refer to Figure 1 and Figure 3As shown, according to one embodiment of the displacement experimental system provided by the present invention, the displacement experimental system further includes a protective cover 15, the displacement experimental device is disposed inside the protective cover 15, and the cooling device 13 is disposed outside the protective cover 15, thereby preventing experimental personnel from being burned, while preventing heat dissipation and loss, and saving energy.

[0040] The displacement experiment system of the present invention heats the heat-conducting medium through the heating device 4. When the temperature sensor 3 detects that the temperature of the heat-conducting medium reaches a first predetermined temperature, the heating device 4 stops heating and conducts a displacement experiment. After the displacement experiment is completed, the temperature control system starts to operate. When the temperature sensor 3 detects that the temperature of the heat-conducting medium reaches a second predetermined temperature, the temperature control system stops operating. The second predetermined temperature is lower than the first predetermined temperature.

[0041] A third aspect of the present invention provides a temperature control method for a displacement experimental system, the temperature control method using the above-described displacement experimental system, comprising the following steps: In the displacement experimental apparatus, a heat-conducting medium at a first predetermined temperature exchanges heat with liquid carbon dioxide, and the carbon dioxide is converted from a gaseous state to a supercritical state. Carbon dioxide is allowed to flow into cooling device 13 to lower the temperature of the carbon dioxide and form a gas-liquid mixture of carbon dioxide; The gas-liquid mixture of carbon dioxide is separated into liquid and liquid phases, with the liquid carbon dioxide flowing into the heat exchange component 5 and the gaseous carbon dioxide flowing into the cooling device 13.

[0042] Optionally, the temperature control method provided by the present invention further includes the following steps: Inject the heat-conducting medium into the displacement experimental device and expel the air from the displacement experimental device until the heat-conducting medium fills the displacement experimental device. A first predetermined temperature is set. When the temperature inside the displacement experimental device is lower than the first predetermined temperature, the heating device 4 is used to start heating the heat transfer medium and the heat transfer medium is heated to the first predetermined temperature at a predetermined rate. The temperature of the heat-conducting medium is maintained at a first predetermined temperature. When the temperature inside the displacement experimental device is lower than the first predetermined temperature, the heating device 4 is used to start heating the heat-conducting medium. When the temperature inside the displacement experimental device is higher than the first predetermined temperature, the heating is stopped, so as to keep the temperature of the heat-conducting medium basically maintained at the first predetermined temperature.

[0043] The specific steps for raising the heat transfer medium to a first predetermined temperature at a predetermined rate, such as 0.1℃ / min, are as follows: the control mechanism supplies power to the heating device 4, the heating device 4 starts heating the heat transfer medium, and a timer starts for 1 minute after the temperature increases by 0.1℃. If the time taken for the temperature to increase by another 0.1℃ exceeds 1 minute, heating continues; if the time taken for the temperature to increase by 0.1℃ does not exceed 1 minute, heating continues after the timer reaches 1 minute, until the temperature reaches the first predetermined temperature, at which point heating stops.

[0044] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A temperature control system for a displacement experimental apparatus, characterized in that, include: Heat exchange component (5), the heat exchange component (5) is disposed in the displacement experimental device and configured to enable the carbon dioxide to be converted from liquid state to supercritical state by exchanging heat between the liquid carbon dioxide in the heat exchange component (5) and the heat-conducting medium in the displacement experimental device. Cooling device (13), the cooling device (13) being connected to the heat exchange assembly (5) for cooling carbon dioxide from the heat exchange assembly (5) and forming a gas-liquid mixture of carbon dioxide; An energy conversion module is connected between the heat exchange assembly (5) and the cooling device (13) and is configured to convert at least a portion of the thermal energy of carbon dioxide from the heat exchange assembly (5) into mechanical energy to drive the carbon dioxide to flow between the heat exchange assembly (5) and the cooling device (13). as well as, A gas-liquid separation device (14) is provided downstream of the cooling device (13) to separate the gas-liquid mixture of carbon dioxide from the cooling device (13) and form liquid carbon dioxide for flowing into the heat exchange assembly (5) and gaseous carbon dioxide for flowing back to the cooling device (13).

2. The temperature control system for the displacement experimental apparatus according to claim 1, characterized in that, The energy conversion module includes a booster turbine (10) for receiving at least a portion of the carbon dioxide from the heat exchange assembly (5) and converting at least a portion of the thermal energy of the carbon dioxide into mechanical energy, and a first booster device (11) drivenly connected to the booster turbine (10) for compressing the carbon dioxide, wherein the carbon dioxide in the first booster device (11) is configured to flow toward the cooling device (13) or the heat exchange assembly (5).

3. The temperature control system for the displacement experimental apparatus according to claim 2, characterized in that, The pressurizing turbine (10), the first pressurizing device (11), the cooling device (13) and the gas-liquid separation device (14) are connected in sequence so that carbon dioxide is compressed in the first pressurizing device (11) and then enters the cooling device (13) for cooling.

4. The temperature control system for the displacement experimental apparatus according to claim 2, characterized in that, The booster turbine (10), the cooling device (13), the gas-liquid separation device (14) and the first booster device (11) are connected in sequence so that carbon dioxide is cooled in the cooling device (13) and then enters the first booster device (11) for compression.

5. The temperature control system for a displacement experimental apparatus according to any one of claims 2-4, characterized in that, The energy conversion module also includes a second booster device (12) that is connected to the booster turbine (10). The second booster device (12) is connected to the cooling device (13) and the gas-liquid separation device (14) respectively, so as to compress the gaseous carbon dioxide from the gas-liquid separation device (14) and deliver it to the cooling device (13).

6. The temperature control system for the displacement experimental apparatus according to claim 2, characterized in that, The energy conversion module further includes a power generation turbine (7) for receiving another portion of the carbon dioxide from the heat exchange component (5) and converting at least a portion of the thermal energy of the carbon dioxide into mechanical energy, a generator (8) connected to the power generation turbine (7) and for converting the mechanical energy generated by the power generation turbine (7) into electrical energy, and a battery pack (9) electrically connected to the generator (8).

7. The temperature control system for the displacement experimental apparatus according to claim 6, characterized in that, The energy conversion module also includes a flow distributor (6) located upstream of the booster turbine (10) and the power generation turbine (7), the flow distributor (6) being configured to regulate the flow rate of carbon dioxide delivered to the booster turbine (10) and the power generation turbine (7), respectively.

8. A displacement experimental system, characterized in that, The device includes a displacement experimental apparatus and a temperature control system according to any one of claims 1-7, wherein the displacement experimental apparatus includes an experimental apparatus housing (1), a cover (2) sealed to the experimental apparatus housing (1), and a heating device (4) disposed in the experimental apparatus housing (1) for heating the heat-conducting medium, and the heat exchange component (5) is disposed in the experimental apparatus housing (1).

9. The displacement experimental system according to claim 8, characterized in that, It also includes a protective cover (15), the displacement experimental device is disposed inside the protective cover (15), and the cooling device (13) is disposed outside the protective cover (15).

10. A temperature control method for a displacement experimental system, characterized in that, Using the displacement experimental system according to claim 8 or 9 includes the following steps: In the displacement experimental apparatus, a heat-conducting medium at a first predetermined temperature exchanges heat with liquid carbon dioxide, and the carbon dioxide is converted from liquid to supercritical state. The carbon dioxide is allowed to flow into the cooling device (13) to lower the temperature of the carbon dioxide and form a gas-liquid mixture of carbon dioxide; The gas-liquid mixture of carbon dioxide is separated into liquid and liquid forms, with the liquid carbon dioxide flowing into the heat exchange assembly (5) and the gaseous carbon dioxide flowing into the cooling device (13).

11. The temperature control method for the displacement experimental system according to claim 10, characterized in that, It also includes the following steps: The heat-conducting medium is injected into the displacement experimental device; The heat-conducting medium is heated to the first predetermined temperature at a predetermined rate; Maintain the temperature of the heat-conducting medium at the first predetermined temperature.

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