Dense-phase supercritical CO2 leakage diffusion similar model experiment system
By designing a dense phase supercritical CO2 leakage diffusion similar model experimental system, using similar theory and dimension analysis methods, the CO2 leakage diffusion simulation with good indoor safety, economical and operationality is achieved, solving the problem of large errors in the experimental results in the existing technology, and providing a basis for CO2 monitoring and probe arrangement.
Patent Information
- Application Number
- CN202422273070.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The prior art is difficult to realize the real simulation of dense phase supercritical CO2 leakage diffusion in terms of indoor safety, operability and economy, and the experimental results are relatively errors, which cannot effectively guide CO2 monitoring and probe arrangement.
A dense phase supercritical CO2 leakage diffusion similar model experimental system was designed, using gas supply, air supply, reaction and data acquisition systems to scale experimental parameters through similar theory and dimension analysis methods to simulate the CO2 leakage process on offshore platforms.
A CO2 leakage diffusion experiment with good indoor safety, operability and economicality was achieved. The experimental results error is within an acceptable range and can truly reflect the CO2 leakage on the offshore platform, guiding the safety distance and monitoring plan.
Smart Images
Figure CN223139538U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of offshore CCS / CCUS engineering, and specifically relates to a dense-phase supercritical CO2 leakage and diffusion similarity model experimental system. Background Technique
[0002] At present, injecting dense-phase supercritical CO2 into the submarine brine layer through an offshore platform for storage is a relatively economical and efficient way to achieve the dual-carbon goal. The CO2 reinjected through the offshore platform is in a supercritical state, with the characteristics of high pressure and high purity. After the supercritical CO2 leaks, it will change from the supercritical state to the saturated gaseous state in the inner space of the leakage port, and high-pressure gas will be released at the leakage port. High-concentration CO2 is extremely dangerous and can cause suffocation of operating personnel.
[0003] In view of this situation, generally, research on CO2 leakage and diffusion is carried out to master the CO2 concentration distribution characteristics under typical working conditions, clarify the dangerous concentration range of CO2, determine the safe range and distance of operating personnel, and at the same time provide a basis for the CO2 monitoring and probe layout plan.
[0004] Currently, for CO2 leakage and diffusion, mainly methods such as mathematical models, numerical simulations, and experimental simulations are used. Mathematical models have good theoretical properties, but the calculation process is complex and the amount of calculation is large. They cannot consider the influence of obstacles on diffusion. Therefore, the calculated CO2 concentration is quite different from the actual situation. The numerical simulation method has good economy and repeatability. At the same time, through geometric modeling, the leakage scenario can be restored 1:1, with good authenticity. However, the disadvantage is that a large number of parameter settings are required, and the quality requirements for simulation personnel are very high. In addition, its major disadvantage is the lack of experimental comparison and verification. The experimental method is the way that can most truly reflect the CO2 leakage and diffusion situation. However, it is very difficult to carry out the leakage and diffusion experiment of the original-scale supercritical CO2. First, a physical model of the offshore platform needs to be built, and at the same time, CO2 under the same working conditions and states also needs to be set up. There are relatively large safety hazards in the experimental process, and the operability and repeatability are very poor. Completing the entire experiment is time-consuming and laborious.
[0005] Therefore, there is an urgent need for a dense-phase supercritical CO2 leakage and diffusion similarity model experimental system that improves the original-scale test. Content of the Utility Model
[0006] Aiming at the above problems, the purpose of the utility model is to provide a dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, which can support an experimental method for synchronously and reasonably scaling the size of the offshore platform and the key parameters of CO2 leakage, so that it can meet the conditions for indoor operation in terms of operability, safety, etc., and at the same time the experimental results are not distorted and the error is within an acceptable range.
[0007] To achieve the above object, the present utility model adopts the following technical solutions:
[0008] The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system of the present utility model includes: a gas supply system for providing a CO2 leakage gas source in the experiment; a wind supply system for providing an ambient wind speed and measuring the ambient average wind speed; a reaction system and a heating system, the reaction system is connected to the gas supply system, and the reaction system is used to react the CO2 leakage gas source into supercritical CO2 under the heating of the heating system; a leakage system connected to the reaction system for leaking and releasing supercritical CO2; a data acquisition system arranged at the tail end of the leakage system for collecting the temperature and concentration data of the released supercritical CO2.
[0009] In the dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, preferably, the gas supply system includes: a liquid CO2 Dewar flask and a liquid CO2 pump; the liquid CO2 Dewar flask and the liquid CO2 pump are connected through a first pipeline; a liquid outlet valve is arranged on the first pipeline; the outlet of the liquid CO2 pump is used to be connected to the storage tank of the reaction system through a second pipeline; a first ball valve is also connected to the outlet of the liquid CO2 pump; a second ball valve is arranged on the second pipeline.
[0010] In the dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, preferably, the wind supply system includes an industrial fan and an anemometer; the industrial fan and the anemometer are respectively arranged on the outer periphery of the reaction system, the industrial fan is used to provide an ambient wind speed, and the anemometer is used to measure the average wind speed in the environment.
[0011] In the dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, preferably, the reaction system includes: a storage tank, a pressure gauge and a safety valve; the inlet of the storage tank is used to be connected to the liquid CO2 pump of the gas supply system through a second pipeline; the pressure gauge and the safety valve are respectively plugged on the storage tank; the outlet of the storage tank is used to be connected to the leakage system through a third pipeline; a third ball valve is arranged on the third pipeline; a fourth ball valve is also connected to the bottom of the storage tank.
[0012] In the dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, preferably, the heating system includes a heating blanket and a heat tracing tape; the two heating blankets are respectively arranged at both ends of the storage tank, the heat tracing tape is arranged on the outer periphery of the third pipeline, and the heating blanket and the heat tracing tape are respectively used to heat the CO2 in the storage tank or in the third pipeline.
[0013] The described dense-phase supercritical CO2 leakage and diffusion similarity model experimental system. Preferably, the leakage system includes a flange, a fourth pipeline, and a leakage nozzle; one end of the fourth pipeline is used to connect to the third pipeline of the reaction system; the other end of the fourth pipeline is connected to the leakage nozzle; the fourth pipeline is in multiple sections, and the multiple sections of the fourth pipeline are connected by flanges; a fifth ball valve is provided on the fourth pipeline.
[0014] The described dense-phase supercritical CO2 leakage and diffusion similarity model experimental system. Preferably, the data acquisition system includes a data recorder, a concentration sensor, and a temperature sensor; the concentration sensor is used to detect the concentration of CO2 ejected from the leakage nozzle; the temperature sensor is used to detect the temperature of CO2 ejected from the leakage nozzle; the data recorder is used to record the concentration and temperature of CO2 ejected from the leakage nozzle.
[0015] Due to the adoption of the above technical solutions, the present utility model has the following advantages:
[0016] (1) The present utility model provides an experimental system that matches the experimental method of the dense-phase supercritical CO2 leakage and diffusion similarity model. The experimental method is based on the similarity theory. By using the dimensional analysis method, the dimensions of the offshore platform and the key parameters of CO2 leakage are synchronously and reasonably scaled. The experimental system meets the conditions for indoor operation and safety, and at the same time, the experimental results are not distorted, and the error is within an acceptable range.
[0017] (2) The present utility model enables the concentration distribution of CO2 after leakage to be determined by key factors such as its initial discharge pressure, ambient wind speed, distance, and time. Description of the Drawings
[0018] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0019] Figure 1 is a schematic structural diagram of the dense-phase supercritical CO2 leakage and diffusion similarity model experimental system described in the present utility model.
[0020] The reference numerals in the drawings are as follows:
[0021] 1 - Liquid CO2 Dewar flask; 2 - Liquid CO2 pump; 3 - First pipeline; 4 - Liquid outlet valve; 5 - Second pipeline; 6 - First ball valve; 7 - Second ball valve; 8 - Storage tank; 9 - Pressure gauge; 10 - Safety valve; 11 - Third pipeline; 12 - Third ball valve; 13 - Fourth ball valve; 14 - Heating blanket; 15 - Heat tracing tape; 18 - Flange; 17 - Fourth pipeline; 18 - Leakage nozzle; 19 - Fifth ball valve; 20 - Data recorder; 21 - Concentration sensor; 22 - Temperature sensor. Specific embodiments
[0022] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.
[0023] The present invention provides an experimental system for a dense-phase supercritical CO2 leakage and diffusion similarity model experiment method. The experimental method is based on similarity theory. By using the dimensional analysis method, the dimensions of the offshore platform and the key parameters of CO2 leakage are synchronously and reasonably scaled. The experimental system meets the conditions for indoor operation and safety, and at the same time, the experimental results are not distorted and the error is within an acceptable range, realizing the verification of numerical simulation. The present invention has practicality, operability and economy, and is applicable to the experimental research on the leakage and diffusion of heavy gases.
[0024] As Figure 1 shown, the present invention provides a dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, including: a gas supply system for providing a CO2 leakage gas source in the experiment; a wind supply system for providing an environmental wind speed and measuring the environmental average wind speed; a reaction system and a heating system, the reaction system is connected to the gas supply system, and the reaction system is used to react the CO2 leakage gas source into supercritical CO2 under the heating of the heating system; a leakage system connected to the reaction system for leaking and releasing supercritical CO2; a data acquisition system arranged at the end of the leakage system for collecting the temperature and concentration data of the released supercritical CO2.
[0025] In the above embodiment, preferably, the gas supply system includes: a liquid CO2 Dewar flask 1 and a liquid CO2 pump 2; the liquid CO2 Dewar flask 1 and the liquid CO2 pump 2 are connected through a first pipeline 3; a liquid outlet valve 4 is arranged on the first pipeline 3; the outlet of the liquid CO2 pump 2 is used to be connected to the storage tank 8 of the reaction system through a second pipeline 5; the outlet of the liquid CO2 pump 2 is also connected with a first ball valve 6; a second ball valve 7 is arranged on the second pipeline 5.
[0026] In the above embodiments, preferably, the air supply system includes an industrial fan and an anemometer (not shown in the figure); the industrial fan and the anemometer are respectively arranged on the outer periphery of the reaction system, the industrial fan is used to provide the ambient wind speed, and the anemometer is used to measure the average wind speed in the environment.
[0027] In the above embodiments, preferably, the reaction system includes a storage tank 8, a pressure gauge 9 and a safety valve 10; the inlet of the storage tank 8 is used to be connected to the liquid CO2 pump 2 of the gas supply system through a second pipeline 5; the pressure gauge 9 and the safety valve 10 are respectively inserted on the storage tank 8, the pressure gauge 9 is used to measure the pressure in the storage tank, and when the pressure exceeds the set value, the safety valve opens for pressure relief; the outlet of the storage tank 8 is used to be connected to the leakage system through a third pipeline 11; a third ball valve 12 is arranged on the third pipeline 11; a fourth ball valve 13 is also connected to the bottom of the storage tank 8.
[0028] In the above embodiments, preferably, the heating system includes a heating blanket 14 and a heat tracing tape 15; two heating blankets 14 are respectively arranged at both ends of the storage tank 8, the heat tracing tape 15 is arranged on the outer periphery of the third pipeline 11, and the heating blanket 14 and the heat tracing tape 15 are respectively used to heat the CO2 in the storage tank 8 or in the third pipeline 11.
[0029] In the above embodiments, preferably, the leakage system includes a flange 16, a fourth pipeline 17 and a leakage nozzle 18; one end of the fourth pipeline 17 is used to be connected to the third pipeline 11 of the reaction system; the other end of the fourth pipeline 17 is connected to the leakage nozzle 18; the fourth pipeline 17 is in multiple sections, and the multiple sections of the fourth pipeline are connected through a flange 16; a fifth ball valve 19 is arranged on the fourth pipeline 17.
[0030] In the above embodiments, preferably, the data acquisition system includes a data recorder 20, a concentration sensor 21 and a temperature sensor 22; the concentration sensor 21 is used to detect the concentration of the CO2 ejected from the leakage nozzle 18; the temperature sensor 22 is used to detect the temperature of the CO2 ejected from the leakage nozzle 18; the data recorder 20 is used to record the concentration and temperature of the CO2 ejected from the leakage nozzle 18.
[0031] The experimental process of the present utility model is as follows:
[0032] (1) Connect the experimental equipment according to the experimental system diagram;
[0033] (2) Arrange a CO2 concentration sensor at the target position, measure the CO2 concentration, and connect it to the data acquisition system, and the power supply voltage of the concentration sensor is 12v;
[0034] (3) Open the liquid outlet valve, the second ball valve, the third ball valve and the fifth ball valve of the liquid CO2 dewar, conduct pipeline purging, and at the same time check for air leakage;
[0035] (4) Liquid CO2 filling, specifically including:
[0036] a) Close the liquid outlet valve, the first ball valve 1 and the fourth ball valve, and open the second ball valve, the third ball valve and the fifth ball valve;
[0037] b) Open the liquid outlet valve and cool the liquid CO2 pump for 8 - 10 minutes;
[0038] c) After the pump is cooled, turn on the motor of the liquid CO2 pump, close the fifth ball valve, start the liquid CO2 pump and adjust the pump speed to inject liquid CO2 into the storage tank. When the pressure gauge of the storage tank is greater than 4 MPa, sequentially close the liquid CO2 pump, the second ball valve and the liquid outlet valve;
[0039] d) Open the first ball valve to empty the CO2 in the pump and the CO2 in the first pipe 1;
[0040] (5) Supercritical CO2 preparation, specifically including:
[0041] a) After the filling is completed, the temperature in the storage tank is lower than -20 °C. Turn on the heating blanket and the tracing heater to heat the reaction system;
[0042] b) Monitor the pressure in the reaction system during the heating process. When the pressure exceeds 11 MPa, open the fourth ball valve for pressure relief. When the pressure drops to 9 MPa, close the fourth ball valve;
[0043] c) When the pressure in the reaction system exceeds 7.38 MPa and the temperature exceeds 31.1 °C, the supercritical CO2 preparation is completed;
[0044] (6) According to the selected leakage diameter and leakage direction, install the corresponding leakage nozzle, and connect the leakage system to the reaction system using a flange;
[0045] (7) Supercritical CO2 leakage experiment, specifically including:
[0046] a) Arrange the camera device to record the supercritical CO2 leakage process;
[0047] b) Open the fifth ball valve and start the supercritical CO2 leakage experiment. When the leakage time is reached, close the fifth ball valve and record the concentration and temperature data;
[0048] c) After a set of experiments are completed, the pressure and temperature of the reaction system will drop. Continue heating until the pressure reaches the requirements for the next set of experiments, and repeat (7).
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A dense-phase supercritical CO2 leakage and diffusion similarity model experimental system, characterized in that, Including: A gas supply system for providing a CO2 leakage gas source in the experiment; A ventilation system for providing ambient wind and measuring the average ambient wind speed; A reaction system and a heating system, the reaction system being connected to the gas supply system, and the reaction system being used to react the CO2 leakage gas source into supercritical CO2 under the heating of the heating system; A leakage system, connected to the reaction system, for leaking and releasing supercritical CO2; A data acquisition system, arranged at the end of the leakage system, for acquiring the temperature and concentration data of the released supercritical CO2.
2. The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system according to claim 1, characterized in that The gas supply system includes: a liquid CO2 Dewar flask and a liquid CO2 pump; The liquid CO2 Dewar flask and the liquid CO2 pump are connected by a first pipeline; An outlet valve is arranged on the first pipeline; The outlet of the liquid CO2 pump is used to be connected to the storage tank of the reaction system through a second pipeline; A first ball valve is also connected to the outlet of the liquid CO2 pump; A second ball valve is arranged on the second pipeline.
3. The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system according to claim 1, wherein The ventilation system includes an industrial fan and an anemometer; The industrial fan and the anemometer are respectively arranged on the outer periphery of the reaction system, the industrial fan is used to provide the ambient wind speed, and the anemometer is used to measure the average wind speed in the environment.
4. The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system according to claim 1, characterized in that The reaction system includes: a storage tank, a pressure gauge and a safety valve; The inlet of the storage tank is used to be connected to the liquid CO2 pump of the gas supply system through a second pipeline; The pressure gauge and the safety valve are respectively plugged on the storage tank; The outlet of the storage tank is used to be connected to the leakage system through a third pipeline; A third ball valve is arranged on the third pipeline; A fourth ball valve is also connected to the bottom of the storage tank.
5. The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system according to claim 4, characterized in that, The heating system includes a heating blanket and a heat tracing tape; Two of the heating blankets are respectively arranged at both ends of the storage tank, the heat tracing tape is arranged on the outer periphery of the third pipeline, and the heating blanket and the heat tracing tape are respectively used to heat the CO2 in the storage tank or in the third pipeline.
6. The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system according to claim 1, characterized in that, The leakage system includes a flange, a fourth pipeline and a leakage nozzle; One end of the fourth pipeline is used to be connected to the third pipeline of the reaction system; The other end of the fourth pipeline is connected to the leakage nozzle; The fourth pipeline is in multiple sections, and multiple sections of the fourth pipeline are connected by flanges; A fifth ball valve is arranged on the fourth pipeline.
7. The dense-phase supercritical CO2 leakage and diffusion similarity model experimental system according to claim 6, characterized in that, The data acquisition system includes a data recorder, a concentration sensor and a temperature sensor; The concentration sensor is used to detect the concentration of the CO2 ejected from the leakage nozzle; The temperature sensor is used to detect the temperature of the CO2 ejected from the leakage nozzle; The data recorder is used to record the concentration and temperature of the CO2 ejected from the leakage nozzle.