Supercritical CO2 soaking experiment device capable of being combined with Hopkinson bar

Abstract

The utility model belongs to the technical field of rock soaking equipment, and particularly relates to a supercritical CO2 soaking experiment device capable of being combined with a Hopkinson bar, which comprises a soaking tank, two ends of the soaking tank are in an open state, a containing cavity is arranged in the soaking tank, a heating plate is fixedly arranged on the inner wall of the containing cavity of the soaking tank, and the heating plate is connected with the Hopkinson bar. An air inlet and an air outlet are respectively formed in the side end of the soaking tank; the open end of the soaking tank is fixedly connected with an incident rod, and the end, away from the soaking tank, of the incident rod is provided with a loading driving system. The other open end of the soaking tank is fixedly connected with a transmission rod, an absorption rod is fixedly mounted at one end, far away from the soaking tank, of the transmission rod, and an axial pressure system is mounted at one end, far away from the transmission rod, of the absorption rod; the end, away from the soaking tank, of the air inlet pipe is connected with a pressurization system in a sealed mode. Strain gauges are mounted at the side ends of the incident rod and the transmission rod; and the strain gauges at the side ends of the incident rod and the transmission rod are electrically connected with a strain data acquisition system through wires.

Description

Technical Field

[0001] The utility model belongs to the technical field of rock soaking equipment, in particular to a supercritical CO2 soaking experimental device which can be combined with a Hopkinson bar. Background Art

[0002] In existing research, most of them are to soak the coal and rock in the Sc-CO2 state and then take it out, and then conduct relevant dynamic experiments to study its dynamic characteristics, which is inconsistent with the actual engineering site background, and in the experimental process, it is difficult to capture the dynamic destruction process of the coal and rock under the action of supercritical CO2. Therefore, it is urgent to study a visual supercritical CO2 immersion experimental device that can be combined with a Hopkinson bar. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a supercritical CO2 immersion experimental device that can be combined with a Hopkinson bar.

[0004] The purpose of this disclosure can be achieved through the following technical solutions:

[0005] A supercritical CO2 immersion experimental device capable of being combined with a Hopkinson bar comprises: an immersion tank, both ends of which are open, a receiving cavity is provided inside the immersion tank, a heating plate is fixedly installed on the inner wall of the receiving cavity of the immersion tank, and an air inlet and an air outlet are respectively provided at the side ends of the immersion tank;

[0006] An incident rod is fixedly connected to one end of the soaking tank in an open state, and a loading drive system is installed at one end of the incident rod away from the soaking tank;

[0007] The other end of the immersion tank in an open state is fixedly connected to a transmission rod, an end of the transmission rod away from the immersion tank is fixedly installed with an absorption rod, and an end of the absorption rod away from the transmission rod is installed with an axial pressure system;

[0008] An air inlet of the soaking tank is sealedly connected to an air inlet pipe, and an end of the air inlet pipe away from the soaking tank is sealedly connected to a pressurization system;

[0009] The side ends of the incident rod and the transmission rod are both installed with strain gauges, and the strain gauges at the side ends of the incident rod and the transmission rod are both electrically connected to the strain data acquisition system through wires.

[0010] Furthermore, the loading drive system includes a first high-pressure CO2 gas cylinder, a first connecting pipe, a high-pressure gas cavity, a gun barrel, a bullet, an infrared emitting device and a timer. The high-pressure gas cavity is sealed and connected to the first high-pressure CO2 gas cylinder through the first connecting pipe. The gun barrel is installed at the end of the high-pressure gas cavity away from the first connecting pipe. The bullet is installed at the end of the gun barrel away from the high-pressure gas cavity. The infrared emitting device is installed at the end of the bullet away from the gun barrel. The infrared emitting device is installed at the side end of the incident rod, and the infrared emitting device is aligned with the incident rod. The timer is electrically connected to the infrared emitting device. A first valve is installed on the first connecting pipe near the first high-pressure CO2 gas cylinder.

[0011] Furthermore, the axial pressure system comprises a damper and an axial pressure loading and unloading device, wherein the damper is fixedly connected to the side end of the absorption rod, and the axial pressure loading and unloading device is fixedly connected to an end of the damper away from the absorption rod.

[0012] Furthermore, the boosting system includes a second high-pressure CO2 gas cylinder, a second connecting pipe, a gas booster pump and a pressure gauge. The second high-pressure CO2 gas cylinder is sealed and connected to the gas booster pump through the second connecting pipe. The gas booster pump is sealed and connected to the air inlet pipe at the side end of the immersion tank. The second connecting pipe is provided with a second valve near the second high-pressure CO2 gas cylinder. The pressure gauge is installed at one end of the air inlet pipe near the gas booster pump.

[0013] Furthermore, the strain data acquisition system electrically connects an ultra-dynamic strain gauge, an oscilloscope recorder and a data processor, the ultra-dynamic strain gauge is electrically connected to two strain gauges, the oscilloscope recorder is electrically connected to the ultra-dynamic strain gauge, and the data processor is electrically connected to the oscilloscope recorder.

[0014] Furthermore, two ends of the immersion tank are respectively connected to the interior of the incident rod and the transmission rod.

[0015] Furthermore, an air outlet pipe is installed at the air outlet of the soaking tank, and a third valve is installed at one end of the air inlet pipe and the air outlet pipe close to the soaking tank.

[0016] Furthermore, a visual observation window is provided at the side end of the soaking tank between the air outlet and the air inlet.

[0017] The nouns, conjunctions or adjectives involved in the above technical solution are explained as follows:

[0018] Fixed connection: refers to a connection in which parts or components are fixed without any relative movement. It is divided into detachable connection and non-detachable connection.

[0019] (1) Removable connection: The parts are fixed together by screws, splines, wedge pins, etc. This connection method can be disassembled for maintenance without damaging the parts. However, the specifications of the connectors used must be correct (such as the length of the bolts, keys, and wedge pins) and they must be properly tightened.

[0020] (2) Non-detachable connection: mainly refers to welding, riveting and tenoning. Since forging, sawing or oxygen cutting are required for disassembly during maintenance or replacement, spare parts generally cannot be reused. At the same time, attention should be paid to process quality, technical inspection and remedial measures (such as calibration, polishing, etc.) during connection.

[0021] The beneficial effects of the present invention are as follows: the supercritical CO2 immersion experimental device proposed in the utility model can be combined with the Hopkinson bar to study the dynamic properties of coal under the action of supercritical CO2, and a booster pump and a heating plate are used to make the room temperature CO2 gas reach a supercritical state in a visual immersion tank. After the coal is fully immersed in the immersion tank, a dynamic impact test is performed on it through a Hopkinson pressure bar; and the airtightness, safety and corrosion resistance of the visual immersion tank to Sc-CO2 meet the experimental requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a front view of the overall device of the embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the overall structure of the soaking tank in the embodiment of the utility model;

[0025] Figure 3 It is a front view of the soaking tank according to the embodiment of the utility model;

[0026] Figure 4 It is a cross-sectional view of the soaking tank according to the embodiment of the utility model.

[0027] Figure numerals: 1. immersion tank; 2. accommodating chamber; 3. heating plate; 4. air inlet; 5. air outlet; 6. incident rod; 7. transmission rod; 8. absorption rod; 9. air inlet pipe; 10. strain gauge; 11. wire; 12. first high-pressure CO2 cylinder; 13. first connecting pipe; 14. high-pressure gas cavity; 15. gun barrel; 16. bullet; 17. infrared emitting device; 18. first valve; 19. damper; 20. axial pressure loading device; 21. second high-pressure CO2 cylinder; 22. second connecting pipe; 23. gas booster pump; 24. pressure gauge; 25. second valve; 26. ultra-dynamic strain gauge; 27. oscilloscope recorder; 28. data processor; 29. ​​air outlet pipe; 30. third valve; 31. timer; 32. visual observation window. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] A supercritical CO2 immersion experimental device that can be combined with a Hopkinson bar, such as Figures 1 to 4 As shown, it comprises: a soaking tank 1, both ends of the soaking tank 1 are in an open state, a receiving chamber 2 is provided inside the soaking tank 1, a heating plate 3 is fixedly installed on the inner wall of the receiving chamber 2 of the soaking tank 1, and an air inlet 4 and an air outlet 5 are respectively opened at the side ends of the soaking tank 1;

[0030] The end of the immersion tank 1 in an open state is fixedly connected with an incident rod 6, and the end of the incident rod 6 away from the immersion tank 1 is installed with a loading drive system; the loading system is configured to enable the loading system to be launched at a speed according to the experimental requirements.

[0031] The other end of the immersion tank 1 in an open state is fixedly connected to a transmission rod 7, and the end of the transmission rod 7 away from the immersion tank 1 is fixedly installed with an absorption rod 8, and the end of the absorption rod 8 away from the transmission rod 7 is installed with an axial pressure system; the axial pressure system is set to apply axial pressure to the incident rod 6, the transmission rod 7 and the absorption rod 8, so that the sample obtains a certain preload; at the same time, it can also make each rod tightly connected.

[0032] The air inlet 4 of the soaking tank 1 is sealed with an air inlet pipe 9, and the end of the air inlet pipe 9 away from the soaking tank 1 is sealed with a boosting system; the boosting system is configured to pressurize the soaking tank 1 to increase the internal pressure of the soaking tank 1, thereby allowing the carbon dioxide gas in the soaking tank 1 to reach a supercritical state.

[0033] The side ends of the incident rod 6 and the transmission rod 7 are both installed with strain gauges 10, and the strain gauges 10 at the side ends of the incident rod 6 and the transmission rod 7 are electrically connected to the strain data acquisition system through wires 11; the strain data acquisition system is configured to be able to collect strain data generated by the impact pattern after the impact, and transmit the strain data to the oscilloscope recorder 27; the results are obtained after processing and analysis by the data processor 28.

[0034] As a preferred embodiment of the present invention, Figure 1 As shown, the loading drive system includes a first high-pressure CO2 gas cylinder 12, a first connecting pipe 13, a high-pressure gas cavity 14, a gun barrel 15, a bullet 16, an infrared emitting device 17 and a timer 31. The high-pressure gas cavity 14 is sealed and connected to the first high-pressure CO2 gas cylinder 12 through the first connecting pipe 13. The gun barrel 15 is installed at the end of the high-pressure gas cavity 14 away from the first connecting pipe 13. The bullet 16 is installed at the end of the gun barrel 15 away from the high-pressure gas cavity 14. The infrared emitting device 17 is installed at the end of the bullet 16 away from the gun barrel 15. The infrared emitting device 17 is installed at the side end of the incident rod 6, and the infrared emitting device 17 is aligned with the incident rod 6. The timer 31 is electrically connected to the infrared emitting device 17; the first connecting pipe 13 is provided with a first valve 18 near the first high-pressure CO2 gas cylinder 12.

[0035] As a preferred embodiment of the present invention, Figure 1 As shown, the axial pressure system includes a damper 19 and an axial pressure loading and unloading device. The damper 19 is fixedly connected to the side end of the absorption rod 8, and the axial pressure loading and unloading device is fixedly connected to one end of the damper 19 away from the absorption rod 8.

[0036] As a preferred embodiment of the present invention, Figure 1 As shown, the boosting system includes a second high-pressure CO2 gas cylinder 21, a second connecting pipe 22, a gas booster pump 23 and a pressure gauge 24. The second high-pressure CO2 gas cylinder 21 is sealedly connected to the gas booster pump 23 through the second connecting pipe 22. The gas booster pump 23 is sealedly connected to the air inlet pipe 9 at the side end of the immersion tank 1. The second connecting pipe 22 is provided with a second valve 25 near the second high-pressure CO2 gas cylinder 21. The pressure gauge 24 is installed at one end of the air inlet pipe 9 near the gas booster pump 23.

[0037] As a preferred embodiment of the present invention, Figure 1 As shown, the strain data acquisition system electrically connects an ultra-dynamic strain gauge 26, an oscilloscope recorder 27 and a data processor 28. The ultra-dynamic strain gauge 26 is electrically connected to the two strain gauges 10, the oscilloscope recorder 27 is electrically connected to the ultra-dynamic strain gauge 26, and the data processor 28 is electrically connected to the oscilloscope recorder 27.

[0038] As a preferred embodiment of the present invention, Figure 1 As shown, the two ends of the immersion tank 1 are respectively connected to the interior of the incident rod 6 and the transmission rod 7.

[0039] As a preferred embodiment of the present invention, Figure 1 As shown, an air outlet pipe 29 is installed at the air outlet 5 of the soaking tank 1, and a third valve 30 is installed at one end of the air inlet pipe 9 and the air outlet pipe 29 close to the soaking tank 1.

[0040] As a preferred embodiment of the present invention, Figure 2 As shown, a visual observation window 32 is also provided at the side end of the soaking tank 1 between the air outlet 5 and the air inlet 4 .

[0041] The working principle and use process of this utility model:

[0042] S1, Experimental preparation stage: Sandpaper polish the contact surfaces of the incident rod 6, the transmission rod 7 and the absorption rod 8 to ensure smooth and flat surfaces, and apply a proper amount of vaseline to ensure that the contact surfaces between each rod are in close contact with other contacts, and set the output file of the oscilloscope recorder 27 to the path where the data processor 28 is located, so as to facilitate the subsequent export and processing of data. Install the immersion tank 1 between the incident rod 6 and the transmission rod 7, and the two ends of the immersion tank 1 are fixedly connected to the incident rod 6 and the transmission rod 7 respectively, and ensure that the connection between the immersion tank 1 and the incident rod 6 and the transmission rod 7 is well sealed, place the absorption rod 8 on the contact surface of the other end of the transmission rod 7, and use the axial pressure loading device 20 to pressurize the absorption rod 8, so that the incident rod 6, the transmission rod 7 and the absorption rod 8 are in close contact; when the damper 19 is in contact with the absorption rod 8, appropriately slow down the pressurization rate. Open the first high-pressure CO2 gas cylinder 12, the second valve 25 and the third valve 30 at the end of the air inlet pipe 9, and at the same time turn on the gas booster pump 23 and the heating plate 3 inside the immersion tank 1, adjust and control the air pressure in the immersion tank 1 to reach 7.3MPa and the temperature to be above 31.1℃. After meeting the experimental requirements, close the first high-pressure CO2 gas cylinder 12, the second valve 25 and the third valve 30 at the end of the air inlet pipe 9, soak the experimental samples according to the experimental requirements, and start the experiment after soaking.

[0043] S2, the beginning of the experiment: check again whether the incident rod 6, the transmission rod 7, the absorption rod 8 and the immersion tank 1 are in good contact. After confirming that the contact is good, start the ultra-dynamic strain gauge 26 to start the experiment; fill the cylindrical bullet 16 in the high-pressure air cavity 14. The specific filling depth depends on different experimental schemes. The commonly used filling depth is 1.5m. After filling, reset the timer 31; open the first high-pressure CO2 gas cylinder 12 to make it reach the air pressure value required by the experiment, unscrew the air valve at the high-pressure air cavity 14, open the first valve 18 and wait for a while. After the inflation is completed, close the air valve; check the oscilloscope recorder 27 to confirm whether it is in the ready state, whether the bridge shows 0, and whether the timer 31 is waiting for a signal. After the inspection is completed, inform the surrounding personnel to take protective measures. Pull the trigger and quickly reset it, wait for the impact, record the waveform displayed by the oscilloscope recorder 27 and the time displayed on the timer 31; check whether the surrounding experimental environment is safe. Under the premise of ensuring safety, disconnect the power supply of the gas booster pump 23 and the heating plate 3, open the third valve 30 at the outlet pipe 29, release the CO2 gas in the immersion tank 1, and after the pressure gauge 24 drops to 0, open the CO2 immersion tank 1 and take out the experimental sample.

[0044] S3, the end of the experiment: collect the residues of the broken samples in time, clean the residual samples on the contact surface between the experimental incident rod 6 and the transmission rod 7, organize the experimental equipment, and clean the experimental site.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The above shows and describes the basic principles, main features and advantages of the present disclosure. Those skilled in the art should understand that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure may have various changes and improvements, and these changes and improvements fall within the scope of the present disclosure to be protected.

Claims

1. A supercritical CO2 immersion experimental device that can be combined with a Hopkinson bar, characterized in that: include: A soaking tank (1), both ends of the soaking tank (1) are in an open state, a receiving chamber (2) is provided inside the soaking tank (1), a heating plate (3) is fixedly mounted on the inner wall of the receiving chamber (2) of the soaking tank (1), and an air inlet (4) and an air outlet (5) are respectively provided at the side ends of the soaking tank (1); An incident rod (6) is fixedly connected to one end of the soaking tank (1) in an open state, and a loading drive system is installed at one end of the incident rod (6) away from the soaking tank (1); The other end of the immersion tank (1) in an open state is fixedly connected to a transmission rod (7), an end of the transmission rod (7) away from the immersion tank (1) is fixedly installed with an absorption rod (8), and an end of the absorption rod (8) away from the transmission rod (7) is installed with an axial pressure system; An air inlet (4) of the soaking tank (1) is sealedly connected to an air inlet pipe (9), and an end of the air inlet pipe (9) away from the soaking tank (1) is sealedly connected to a pressurization system; Strain gauges (10) are installed at the side ends of the incident rod (6) and the transmission rod (7), and the strain gauges (10) at the side ends of the incident rod (6) and the transmission rod (7) are electrically connected to a strain data acquisition system via a wire (11).

2. A supercritical CO2 immersion experimental device capable of combining a Hopkinson bar according to claim 1, characterized in that: The loading drive system comprises a first high-pressure CO2 gas cylinder (12), a first connecting pipe (13), a high-pressure gas chamber (14), a gun barrel (15), a bullet (16), an infrared emitting device (17) and a timer (31); the high-pressure gas chamber (14) is sealed and connected to the first high-pressure CO2 gas cylinder (12) through the first connecting pipe (13); the gun barrel (15) is installed at one end of the high-pressure gas chamber (14) away from the first connecting pipe (13); the bullet (16) is installed at one end of the gun barrel (15) away from the high-pressure gas chamber (14); the infrared emitting device (17) is installed at one end of the bullet (16) away from the gun barrel (15); the infrared emitting device (17) is installed at the side end of the incident rod (6), and the infrared emitting device (17) is aligned with the incident rod (6); the timer (31) is electrically connected to the infrared emitting device (17); and a first valve (18) is installed at the first connecting pipe (13) near the first high-pressure CO2 gas cylinder (12).

3. The supercritical CO2 immersion experimental device capable of combining with a Hopkinson bar according to claim 1, characterized in that: The axial pressure system comprises a damper (19) and an axial pressure loading and unloading device, wherein the damper (19) is fixedly connected to the side end of the absorption rod (8), and the axial pressure loading and unloading device is fixedly connected to an end of the damper (19) away from the absorption rod (8).

4. The supercritical CO2 immersion experimental device capable of combining with a Hopkinson bar according to claim 1, characterized in that: The boosting system comprises a second high-pressure CO2 gas cylinder (21), a second connecting pipe (22), a gas booster pump (23) and a pressure gauge (24); the second high-pressure CO2 gas cylinder (21) is sealedly connected to the gas booster pump (23) via the second connecting pipe (22); the gas booster pump (23) is sealedly connected to an air inlet pipe (9) at a side end of the soaking tank (1); a second valve (25) is installed on the second connecting pipe (22) near the second high-pressure CO2 gas cylinder (21); and the pressure gauge (24) is installed on one end of the air inlet pipe (9) near the gas booster pump (23).

5. The supercritical CO2 immersion experimental device capable of combining with a Hopkinson bar according to claim 1, characterized in that: The strain data acquisition system is electrically connected to include an ultra-dynamic strain gauge (26), an oscilloscope recorder (27) and a data processor (28); the ultra-dynamic strain gauge (26) is electrically connected to the two strain gauges (10); the oscilloscope recorder (27) is electrically connected to the ultra-dynamic strain gauge (26); and the data processor (28) is electrically connected to the oscilloscope recorder (27).

6. The supercritical CO2 immersion experimental device capable of combining with a Hopkinson bar according to claim 1, characterized in that: The two ends of the immersion tank (1) are respectively connected to the interior of the incident rod (6) and the transmission rod (7).

7. The supercritical CO2 immersion experimental device capable of combining with a Hopkinson bar according to claim 1, characterized in that: An air outlet pipe (29) is installed at the air outlet (5) of the soaking tank (1), and a third valve (30) is installed at one end of the air inlet pipe (9) and the air outlet pipe (29) close to the soaking tank (1).

8. The supercritical CO2 immersion experimental device capable of combining with a Hopkinson bar according to claim 1, characterized in that: A visual observation window (32) is also provided at the side end of the soaking tank (1) between the air inlet (4) and the air outlet (5).

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