Supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measuring system and method

Abstract

The invention provides a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measuring system and method.The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measuring system comprises an experimental device body and a testing device.The experimental device body comprises a gas supply system, a liquid storage system, a feeding stirring system and a control system, the gas supply system is used for supplying CO2, the liquid storage system is used for storing liquefied CO2, and the feeding stirring system is used for feeding the liquefied CO2; the feeding and stirring system is used for feeding and stirring the liquid storage system, and the control system is used for controlling the flow and emission of CO2; the test system comprises a pressure sensor, a temperature sensor and a wire mesh probe system, the pressure sensor is used for testing the pressure along the line in the test section, the temperature sensor is used for testing the local temperature of the flow field in the test section, and the wire mesh probe system is used for measuring the phase state distribution and the speed evolution of bubbles in the test section according to the electrical principle. Therefore, transient synchronous measurement of a phase field, a temperature field, a pressure field and the like in the flash evaporation process in the supercritical carbon dioxide tube can be realized, and the purpose of quantitative testing is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of multiphase flow parameter measurement and nuclear reactor thermal hydraulics, and in particular to a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system and method. Background Art

[0002] The SCO2 Brayton cycle has become an important development direction of the fourth generation of advanced reactors due to its high thermal efficiency, compact structure, simple system and environmental friendliness. It has broad development prospects in many fields such as "dual carbon" zero-carbon energy supply, "deep sea" underwater power, and "deep space" Mars exploration. However, the pipelines or equipment in the Brayton cycle system may leak or have small rupture accidents due to corrosion, crack initiation or sealing failure. Once a rupture accident occurs, the high-pressure SCO2 in the tube quickly loses pressure and flashes, and a gas-liquid two-phase critical flow (choked flow) phenomenon occurs at the rupture. The SCO2 leakage rate in the accident is of great significance for evaluating the energy loss rate of the system, determining the development process and hazards of the accident, and designing the accident mitigation system. The critical mass flow rate at the rupture is the most critical parameter for accurately predicting the leakage rate. It is generally believed that the critical flow is formed when the fluid flow velocity reaches the local sound velocity, and the appearance of flash evaporation causes the working fluid in the tube to change from a single phase to a gas-liquid two-phase. Due to the different local sound velocities of the gas phase and the liquid phase, the phase distribution in the tube will affect the local sound velocity, thereby affecting the formation process and flow characteristics of the critical flow. In order to deeply study the gas-liquid two-phase flow characteristics during the decompression flash process of the SCO2 pipeline, it is necessary to develop relevant measurement technologies and carry out response experimental research.

[0003] The SCO2 pipeline leakage involves the gas-liquid two-phase flow and heat transfer behavior in the transcritical flash process. The fluid flow time scale is short, the density variation is large, and the light refraction is strong. It is difficult to obtain a clear flow field distribution with common measurement technology, making both experimental and theoretical research challenging. The high-pressure characteristics of SCO2 limit traditional measurement technology. The schlieren density field measurement technology commonly used in low-pressure flash conditions cannot obtain effective data due to the existence of the transcritical process. Some scholars have also tried to use high-speed camera technology to visualize the bubble growth characteristics, but can only obtain conventional information such as the bubble generation location or bubble density number, and cannot quantitatively obtain key parameters such as the transition boundary of different phase types and the gas phase gas content. The lack of basic experimental data on SCO2 expansion flash is the main reason why the SCO2 flash mechanism and critical flow characteristics cannot be revealed at present, and it also limits the development of theoretical models and numerical simulations. Summary of the invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide a system and method for measuring the gas-liquid two-phase flow pattern of a supercritical carbon dioxide pipeline.

[0005] In a first aspect, an embodiment of the present application provides a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system, including: an experimental device body and a test device, wherein:

[0006] The experimental device body includes: a gas supply system, a liquid storage system, a feeding and stirring system and a control system, wherein the gas supply system is used to provide a supply of CO2, the liquid storage system is used to store liquefied CO2, the feeding and stirring system is used to feed and stir the liquid storage system, and the control system is used to control the flow and emission of CO2;

[0007] The test system includes: a pressure sensor, a temperature sensor and a wire mesh probe system. The pressure sensor is used to test the pressure along the test section, the temperature sensor is used to test the local temperature of the flow field in the test section, and the wire mesh probe system is used to measure the phase distribution and bubble velocity evolution in the test section based on electrical principles.

[0008] Optionally, the gas supply system includes: a Dewar flask and a low-pressure gas cylinder, which are respectively used to supply CO2 in different experimental stages.

[0009] Optionally, the liquid storage system comprises: a liquid storage tank, which is connected to the gas supply system via a liquid phase branch, and is used to store liquefied CO2 and supply liquefied CO2 during the experiment;

[0010] A pressure difference sensor is also installed on the side of the liquid storage tank, and the pressure difference sensor is used to measure the liquid level of the liquid storage tank.

[0011] Optionally, the feeding and stirring system includes: a mechanical stirring device and a feeding box, the feeding box is connected to the liquid storage tank, the feeding box stores electrolyte provided to the liquid storage tank, and after the feeding of the feeding box is completed, the liquid storage tank is stirred by the mechanical stirring device to make the liquid in the liquid storage tank evenly mixed.

[0012] Optionally, the control system includes: a temperature control system and a flow control system, wherein:

[0013] The temperature control system comprises: a heater and a plurality of temperature sensors, wherein the heater is arranged at the periphery of the liquid storage tank for heating the liquid storage tank, and the plurality of temperature sensors are arranged along the loop pipeline for collecting the temperature of each section of the loop pipeline;

[0014] The flow control system includes: multiple solenoid valves, which are located on the liquid phase branch, the gas phase branch, the feeding branch of the feeding box, the outlet of the liquid storage tank, the outlet of the low-pressure bottle, and the downstream pipeline of the wire mesh probe system. They are used to adjust the flow of the entire experimental process by controlling the opening and closing of different solenoid valves at different experimental stages.

[0015] Optionally, the solenoid valve located on the gas phase branch is opened at the beginning of the experiment to perform gas washing and cooling treatment on the experimental device body.

[0016] Optionally, the wire mesh probe system comprises: an excitation end electrode, a receiving end electrode, a sealing gasket and a butt welding flange,

[0017] The excitation end electrode and the receiving end electrode constitute the wire mesh probe body, the butt welding flange is installed on both sides of the excitation end electrode and the electrode receiving end electrode, and the sealing gasket is used to seal between the butt welding flange and the electrode, wherein:

[0018] The material of the butt-weld flange is the same as that of the main pipe of the experimental device. The wire mesh probe system is arranged upstream of the solenoid valve and is used to measure the phase distribution and bubble velocity evolution in the test section under a high-pressure environment.

[0019] In a second aspect, an embodiment of the present application provides a method for measuring a gas-liquid two-phase flow pattern in a supercritical carbon dioxide pipeline, which is applied in a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system described in any one of the first aspects, and the method comprises:

[0020] Open the solenoid valve located in the gas phase branch, control CO2 to enter the liquid storage tank and the connected pipeline through the gas phase outlet of the Dewar flask, and perform gas washing and cooling. After the gas washing is completed, close the solenoid valve located in the downstream pipeline of the wire mesh probe system and the solenoid valve located at the outlet of the liquid storage tank;

[0021] Open the solenoid valve of the feeding branch of the feeding box to control the electrolyte in the feeding box to flow into the liquid storage tank along the pipeline, and close the solenoid valve of the feeding branch of the feeding box after the feeding is completed;

[0022] Open the solenoid valve at the outlet of the low-pressure gas bottle, control the low-pressure gas bottle to pass CO2 into the pipeline, monitor the pressure in the pipeline through the pressure sensor, and close the solenoid valve at the outlet of the low-pressure gas bottle when the pressure reaches a preset threshold;

[0023] Control the Dewar flask to pass CO2 into the liquid storage tank through the gas phase branch, and when the pressure in the liquid storage tank also reaches the preset threshold, close the solenoid valve located in the gas phase branch;

[0024] Open the solenoid valve located in the liquid phase branch, control the Dewar flask to inject liquid CO2 into the liquid storage tank, and turn on the mechanical stirring device at the same time to fully mix the liquid CO2 and electrolyte in the liquid storage tank. When the liquid level scale line indicated by the differential pressure sensor reaches the specified position, close the solenoid valve located in the liquid phase branch, and then continue stirring. When the stirring time is greater than the preset time, turn off the mechanical stirring device;

[0025] Open the solenoid valve at the outlet of the liquid storage tank, and after standing for a preset period of time, heat the liquid storage tank through the heater. According to the readings of the pressure sensor and the temperature sensor, when the temperature and pressure rise to the specified level, open the solenoid valve on the downstream pipeline of the wire mesh probe system to start the carbon dioxide emission experiment;

[0026] The flow rate during the experiment was recorded by a mass flow meter;

[0027] The temperature field and pressure field are measured synchronously by installing temperature sensors and pressure sensors along the process;

[0028] By taking images of gas-liquid-solid multiphase jets with a high-speed camera, visualization results can be obtained;

[0029] Transient synchronous measurement of two-phase mobile phase field data in flash evaporation process using a wire mesh probe.

[0030] In a third aspect, an embodiment of the present application provides a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measuring device, comprising: a processor and a memory, wherein the memory stores executable program instructions, and when the processor calls the program instructions in the memory, the processor is used to:

[0031] Execute the steps of the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement method as described in any one of the first aspects.

[0032] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium for storing a program, which, when executed, implements the steps of the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement method as described in any one of the first aspects.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] In this application, an experimental device body and a test device are set, wherein: the experimental device body includes: a gas supply system, a liquid storage system, a feeding and stirring system and a control system, the gas supply system is used to provide a supply of CO2, the liquid storage system is used to store liquefied CO2, the feeding and stirring system is used to feed and stir the liquid storage system, and the control system is used to control the flow and emission of CO2; the test system includes: a pressure sensor, a temperature sensor and a wire mesh probe system, the pressure sensor is used to test the pressure along the test section, the temperature sensor is used to test the local temperature of the flow field in the test section, and the wire mesh probe system is used to measure the phase distribution and the velocity evolution of the bubble in the test section according to the electrical principle. Thus, the method of adding electrolyte (water / ionic liquid) to liquid carbon dioxide is adopted to overcome the problem of extremely low conductivity of polar carbon dioxide substances and small difference in gas-liquid dielectric constants. By combining the wire mesh probe technology, temperature sensor and pressure sensor suitable for high-pressure environments, the transient synchronous measurement of the phase field, temperature field, pressure field, etc. of the flash evaporation process in the supercritical carbon dioxide tube is realized, and the purpose of quantitative testing is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious:

[0036] Figure 1 A structural schematic diagram of a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system provided in an embodiment of the present application.

[0037] In the figure: 1-Dewar flask; 2-low-pressure gas cylinder; 3-liquid storage tank; 4-feeding box; 5-differential pressure sensor; 6-mechanical stirring device; 7-heater; 8-mass flow meter; 9-pressure sensor; 10-temperature sensor; 11-wire mesh probe; 12-high-speed camera; V1~V6-solenoid valves. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] The following specific embodiments are used to describe in detail the technical solution of the present invention and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0043] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] Exemplarily, the present application provides a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system, comprising: an experimental device body and a test device, wherein: the experimental device body comprises: a gas supply system, a liquid storage system, a feeding and stirring system and a control system, the gas supply system is used to provide CO2 supply, the liquid storage system is used to store liquefied CO2, the feeding and stirring system is used to feed and stir the liquid storage system, and the control system is used to control the flow and emission of CO2; the test system comprises: a pressure sensor, a temperature sensor and a wire mesh probe system, the pressure sensor is used to test the pressure along the test section, the temperature sensor is used to test the local temperature of the flow field in the test section, and the wire mesh probe system is used to measure the phase distribution and bubble velocity evolution in the test section according to electrical principles.

[0045] In the embodiment of the present application, the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system is divided into two parts, the experimental device body and the test system. The experimental device body is used to realize the supply, storage, regulation and emission of CO2. The test system measures the pressure along the test section, the local temperature of the flow field in the test section, the phase distribution in the test section and the velocity evolution of the bubbles in different test stages.

[0046] In some embodiments, the gas supply system includes: a Dewar flask and a low-pressure gas cylinder, which are respectively used to supply CO2 at different experimental stages.

[0047] In this embodiment, the Dewar flask is used to supply gas to the liquid storage tank, and can perform gas washing and cooling at the beginning. After the gas washing is completed, the solenoid valve located on the downstream pipeline of the wire mesh probe system and the solenoid valve located at the outlet of the liquid storage tank are closed. The low-pressure gas cylinder is used to open the solenoid valve located at the outlet of the low-pressure gas cylinder after the addition is completed, and control the low-pressure gas cylinder to pass CO2 into the pipeline.

[0048] In some embodiments, the liquid storage system includes: a liquid storage tank, which is connected to the gas supply system through a liquid phase branch, and is used to store liquefied CO2 and supply liquefied CO2 during the experiment; a pressure differential sensor is also installed on the side of the liquid storage tank, and the pressure differential sensor is used to measure the liquid level of the liquid storage tank.

[0049] In this embodiment, the differential pressure sensor is used to measure the liquid level of the liquid storage tank. When the pressure in the liquid storage tank reaches a preset threshold, the solenoid valve located in the gas phase branch is closed.

[0050] In some embodiments, the feeding and stirring system includes: a mechanical stirring device and a feeding box, wherein the feeding box is connected to the liquid storage tank, and the feeding box stores electrolyte provided to the liquid storage tank. After the feeding of the feeding box is completed, the liquid storage tank is stirred by the mechanical stirring device to make the liquid in the liquid storage tank evenly mixed.

[0051] In some embodiments, the control system includes: a temperature control system and a flow control system, wherein: the temperature control system includes: a heater and a plurality of temperature sensors, the heater is arranged on the periphery of the liquid storage tank for heating the liquid storage tank, and the plurality of temperature sensors are arranged along the loop pipeline for collecting temperature of each section of the loop pipeline; the flow control system includes: a plurality of solenoid valves, the solenoid valves are located on the liquid phase branch, the gas phase branch, the feeding branch of the feeding box, the outlet of the liquid storage tank, the outlet of the low-pressure bottle, and the downstream pipeline of the wire mesh probe system, and are used to adjust the flow of the entire experimental process by controlling the opening and closing of different solenoid valves at different experimental stages.

[0052] In some embodiments, the solenoid valve located on the gas phase branch is opened at the beginning of the experiment to perform gas washing and cooling treatment on the experimental device body.

[0053] In some embodiments, the wire mesh probe system includes: an excitation end electrode, a receiving end electrode, a sealing gasket and a butt-welding flange. The excitation end electrode and the receiving end electrode constitute the wire mesh probe body. The butt-welding flanges are installed on both sides of the excitation end electrode and the receiving end electrode. The sealing gasket is used to seal the butt-welding flange and the electrode, wherein: the material of the butt-welding flange is the same as the material of the main body pipeline of the experimental device. The wire mesh probe system is arranged upstream of the solenoid valve, and is used to measure the phase distribution and bubble velocity evolution in the test section under a high-pressure environment.

[0054] This embodiment can realize the transient synchronous measurement of the phase field, temperature field, pressure field, etc. during the flash evaporation process of supercritical carbon dioxide in the tube.

[0055] Exemplarily, the present application also provides a method for measuring a gas-liquid two-phase flow pattern in a supercritical carbon dioxide pipeline, which is applied to the above-mentioned supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system, and the method includes:

[0056] Step S1, open the solenoid valve located in the gas phase branch, control CO2 to enter the liquid storage tank and the connected pipeline through the gas phase outlet of the Dewar flask, perform gas washing and cooling, and after the gas washing is completed, close the solenoid valve located in the downstream pipeline of the wire mesh probe system and the solenoid valve located at the outlet of the liquid storage tank;

[0057] Step S1, open the solenoid valve of the feeding branch located in the feeding box, control the electrolyte in the feeding box to enter the liquid storage tank along the pipeline, and close the solenoid valve of the feeding branch located in the feeding box after the feeding is completed.

[0058] Step S2, open the solenoid valve at the outlet of the low-pressure bottle, control the low-pressure bottle to introduce CO2 into the pipeline, monitor the pressure in the pipeline through the pressure sensor, and close the solenoid valve at the outlet of the low-pressure bottle when the pressure reaches a preset threshold.

[0059] Step S3, controlling the Dewar flask to introduce CO2 into the liquid storage tank through the gas phase branch, and when the pressure in the liquid storage tank also reaches a preset threshold, closing the solenoid valve located in the gas phase branch.

[0060] Step S4, open the solenoid valve located in the liquid phase branch, control the Dewar flask to inject liquid CO2 into the liquid storage tank, and turn on the mechanical stirring device at the same time to fully mix the liquid CO2 and electrolyte in the liquid storage tank. When the liquid level scale line indicated by the pressure difference sensor reaches the specified position, close the solenoid valve located in the liquid phase branch, and then continue stirring. When the stirring time is greater than the preset time, turn off the mechanical stirring device.

[0061] Step S5, open the solenoid valve at the outlet of the liquid storage tank, and after standing for a preset period of time, heat the liquid storage tank through a heater. According to the readings of the pressure sensor and the temperature sensor, when the temperature and pressure rise to the specified level, open the solenoid valve on the downstream pipeline of the wire mesh probe system to start the carbon dioxide emission experiment.

[0062] Step S6, recording the flow rate during the experiment using a mass flow meter.

[0063] Step S7, synchronously measuring the temperature field and the pressure field by using the temperature sensors and pressure sensors installed along the process.

[0064] Step S8, obtaining a visualization result by taking a gas-liquid-solid multiphase jet image with a high-speed camera.

[0065] Step S9, performing transient synchronous measurement of two-phase mobile phase field data during the flash evaporation process by using a wire mesh probe.

[0066] It should be noted that the execution order of steps S6 to S9 is not limited in this embodiment, and these steps may also be executed simultaneously.

[0067] For example, Figure 1 A schematic diagram of a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the system in this embodiment may include: a Dewar flask 1, a low-pressure gas cylinder 2, a liquid storage tank 3, a feeding box 4, a differential pressure sensor 5, a mechanical stirring device 6, a heater 7, a mass flow meter 8, a pressure sensor 9, a temperature sensor 10, a wire mesh probe 11, a high-speed camera 12 and solenoid valves V1 to V6.

[0068] Exemplarily, when conducting a carbon dioxide pipeline leakage flash experiment, first open the solenoid valve V2 located in the gas phase branch, and CO2 enters the liquid storage tank 3 and the connected pipeline through the gas phase outlet of the Dewar flask 1 for gas washing and cooling. After the gas washing is completed, close the solenoid valve V6 and the solenoid valve V4. Preferably, the gas washing time should be greater than 3 minutes. Then open the solenoid valve V3, and the electrolyte in the feeding box 4 enters the liquid storage tank 2 along the pipeline, and then close the solenoid valve V3. Open the solenoid valve V5, and the low-pressure gas cylinder 2 passes CO2 into the pipeline. The pressure in the pipeline is observed through the pressure sensor 9. Preferably, when the pressure reaches 0.5MPa, close the solenoid valve V5. Use the Dewar flask 1 to pass CO2 into the liquid storage tank 2 through the gas phase branch. When the pressure in the liquid storage tank 2 also reaches 0.5MPa, close the solenoid valve V2. Open the solenoid valve V1, use the Dewar flask 1 to inject liquid CO2 into the liquid storage tank 2, preferably, the injection pressure is 2.0MPa, and at the same time, turn on the mechanical stirring device 6 to fully mix the liquid CO2 and electrolyte in the liquid storage tank 2. When the liquid level scale indicated by the pressure difference sensor 5 reaches the specified position, close the solenoid valve V1, and then continue stirring. Preferably, the stirring time should be greater than 20 minutes. After the stirring is completed, turn off the mechanical stirring device 6. Open the solenoid valve V4, let it stand for 10 minutes, and heat the liquid storage tank 2 through the heater 7. The type of heater 7 is a jacketed oil bath device. According to the readings of the pressure sensor 9 and the temperature sensor 10, when it rises to the specified temperature and pressure, open the solenoid valve V6 to start the carbon dioxide emission experiment. The flow rate during the experiment is recorded by a mass flow meter 8, the temperature field and pressure field are synchronously measured by temperature sensors 10 and pressure sensors 9 installed along the process, the high-speed camera 12 captures the gas-liquid-solid multiphase jet image to obtain the visualization result, and the wire mesh probe 11 is used to perform transient synchronous measurement of the two-phase flow phase field data of the flash evaporation process.

[0069] This embodiment can realize the coordinated measurement of basic data such as phase field, temperature field, flow field, etc., and can post-process the collected data to obtain key information such as phase content distribution and flow pattern transition boundary.

[0070] An embodiment of the present application also provides a supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement device, including: a processor and a memory, wherein the memory stores executable program instructions, and when the processor calls the program instructions in the memory, the processor is used to: execute the steps of the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement method in the above embodiment.

[0071] It should be noted that those skilled in the art will appreciate that various aspects of the present invention may be implemented as systems, methods or program products. Therefore, various aspects of the present invention may be specifically implemented in the following forms, namely: complete hardware implementation, complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to as "circuit", "module" or "platform" herein.

[0072] In addition, an embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When at least one processor of a user device executes the computer-executable instructions, the user device executes the above-mentioned various possible methods. Among them, the computer-readable medium includes a computer storage medium and a communication medium, wherein the communication medium includes any medium that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer. An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a user device. Of course, the processor and the storage medium can also exist in a communication device as discrete components.

[0073] The present application also provides a program product, which includes a computer program. The computer program is stored in a readable storage medium. At least one processor of the server can read the computer program from the readable storage medium. At least one processor executes the computer program so that the server implements any method of the above-mentioned embodiments of the present invention.

[0074] The program product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0075] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A supercritical carbon dioxide pipeline gas-liquid two-phase flow measurement system, characterized in that: include: Experimental device and test device, including: The experimental device body includes: a gas supply system, a liquid storage system, a feeding and stirring system and a control system, wherein the gas supply system is used to provide a supply of CO2, the liquid storage system is used to store liquefied CO2, the feeding and stirring system is used to feed and stir the liquid storage system, and the control system is used to control the flow and emission of CO2; The test system includes: a pressure sensor, a temperature sensor and a wire mesh probe system. The pressure sensor is used to test the pressure along the test section, the temperature sensor is used to test the local temperature of the flow field in the test section, and the wire mesh probe system is used to measure the phase distribution and bubble velocity evolution in the test section based on electrical principles.

2. The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to claim 1 is characterized in that: The gas supply system includes: a Dewar flask and a low-pressure gas cylinder, which are respectively used to supply CO2 in different experimental stages.

3. The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to claim 2, characterized in that: The liquid storage system comprises: a liquid storage tank, which is connected to the gas supply system through a liquid phase branch and is used to store liquefied CO2 and supply liquefied CO2 during the experiment; A pressure difference sensor is also installed on the side of the liquid storage tank, and the pressure difference sensor is used to measure the liquid level of the liquid storage tank.

4. The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to claim 3 is characterized in that: The feeding and stirring system includes: a mechanical stirring device and a feeding box, wherein the feeding box is connected to the liquid storage tank, and the feeding box stores electrolyte provided to the liquid storage tank. After the feeding of the feeding box is completed, the liquid storage tank is stirred by the mechanical stirring device so that the liquid in the liquid storage tank is evenly mixed.

5. The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to claim 3, characterized in that: The control system includes: a temperature control system and a flow control system, wherein: The temperature control system comprises: a heater and a plurality of temperature sensors, wherein the heater is arranged at the periphery of the liquid storage tank for heating the liquid storage tank, and the plurality of temperature sensors are arranged along the loop pipeline for collecting the temperature of each section of the loop pipeline; The flow control system includes: multiple solenoid valves, which are located on the liquid phase branch, the gas phase branch, the feeding branch of the feeding box, the outlet of the liquid storage tank, the outlet of the low-pressure bottle, and the downstream pipeline of the wire mesh probe system. They are used to adjust the flow of the entire experimental process by controlling the opening and closing of different solenoid valves at different experimental stages.

6. The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to claim 5, characterized in that: The solenoid valve located on the gas phase branch is opened at the beginning of the experiment to perform gas washing and cooling treatment on the experimental device body.

7. The supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to any one of claims 1 to 6, characterized in that: The wire mesh probe system includes: an excitation end electrode, a receiving end electrode, a sealing gasket and a butt welding flange. The excitation end electrode and the receiving end electrode constitute the wire mesh probe body, the butt welding flange is installed on both sides of the excitation end electrode and the electrode receiving end electrode, and the sealing gasket is used to seal between the butt welding flange and the electrode, wherein: The material of the butt-weld flange is the same as that of the main pipe of the experimental device. The wire mesh probe system is arranged upstream of the solenoid valve and is used to measure the phase distribution and bubble velocity evolution in the test section under a high-pressure environment.

8. A method for measuring gas-liquid two-phase flow pattern in a supercritical carbon dioxide pipeline, characterized in that: Applied in the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement system according to any one of claims 1 to 7, the method comprises: Open the solenoid valve located in the gas phase branch, control CO2 to enter the liquid storage tank and the connected pipeline through the gas phase outlet of the Dewar flask, and perform gas washing and cooling. After the gas washing is completed, close the solenoid valve located in the downstream pipeline of the wire mesh probe system and the solenoid valve located at the outlet of the liquid storage tank; Open the solenoid valve of the feeding branch of the feeding box to control the electrolyte in the feeding box to flow into the liquid storage tank along the pipeline, and close the solenoid valve of the feeding branch of the feeding box after the feeding is completed; Open the solenoid valve at the outlet of the low-pressure gas bottle, control the low-pressure gas bottle to pass CO2 into the pipeline, monitor the pressure in the pipeline through the pressure sensor, and close the solenoid valve at the outlet of the low-pressure gas bottle when the pressure reaches a preset threshold; Control the Dewar flask to pass CO2 into the liquid storage tank through the gas phase branch, and when the pressure in the liquid storage tank also reaches the preset threshold, close the solenoid valve located in the gas phase branch; Open the solenoid valve located in the liquid phase branch, control the Dewar flask to inject liquid CO2 into the liquid storage tank, and turn on the mechanical stirring device at the same time to fully mix the liquid CO2 and electrolyte in the liquid storage tank. When the liquid level scale line indicated by the differential pressure sensor reaches the specified position, close the solenoid valve located in the liquid phase branch, and then continue stirring. When the stirring time is greater than the preset time, turn off the mechanical stirring device; Open the solenoid valve at the outlet of the liquid storage tank, and after standing for a preset period of time, heat the liquid storage tank through the heater. According to the readings of the pressure sensor and the temperature sensor, when the temperature and pressure rise to the specified level, open the solenoid valve on the downstream pipeline of the wire mesh probe system to start the carbon dioxide emission experiment; The flow rate during the experiment was recorded by a mass flow meter; The temperature field and pressure field are measured synchronously by installing temperature sensors and pressure sensors along the process; By taking images of gas-liquid-solid multiphase jets with a high-speed camera, visualization results can be obtained; Transient synchronous measurement of two-phase mobile phase field data in flash evaporation process using a wire mesh probe.

9. A supercritical carbon dioxide pipeline gas-liquid two-phase flow measurement device, characterized in that: include: A processor and a memory, wherein the memory stores executable program instructions, and when the processor calls the program instructions in the memory, the processor is used to: Execute the steps of the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement method as described in claim 8.

10. A computer-readable storage medium for storing a program, characterized in that: When the program is executed, the steps of the supercritical carbon dioxide pipeline gas-liquid two-phase flow pattern measurement method described in claim 8 are implemented.

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