CN115266465A - Industrial CT gas adsorption experiment system and use method - Google Patents
Industrial CT gas adsorption experiment system and use method Download PDFInfo
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Abstract
The invention discloses an industrial CT gas adsorption experiment system and a using method thereof, and is characterized in that: comprises a gas supply system, which is used for outputting gas into a pipeline at a constant pressure; the loading system is communicated with the gas supply system and is used for inputting water to apply axial pressure and confining pressure on the sample, transmitting the coal sample in an all-dimensional scanning mode and collecting attenuated ray information; the method is suitable for measuring the adsorption capacity of the coal to the gas and the real-time degradation degree of the gas to the coal body, can measure parameters such as the fracture evolution rule, the mechanical property, the permeability coefficient, the gas adsorption capacity and the like of the coal sample under the conditions of different axial pressures, different confining pressures and different gas supply pressures, is suitable for the test of the coal gas adsorption rule, can accurately simulate the underground reservoir environment, and has high test efficiency.
Description
Technical Field
The invention relates to the technical field of gas control, in particular to an industrial CT gas adsorption experiment system and a using method thereof.
Background
The gradual exhaustion of shallow resources, deep coal mining apparently tend to the normality, and along with the increase of the mining depth, gas pressure and gas content also rise gradually, and the frequency that coal mine dynamic disaster takes place is increasingly high. The gas promotes the germination and development of new fractures of the coal body and the expansion and communication of original fractures, and the mechanical properties of the coal body are degraded, so that the coal and gas outburst disasters are increasingly serious.
To reveal the mechanism of coal and gas outburst, the processes of gas adsorption, desorption, diffusion and permeation during outburst and the mechanism of action during outburst must be studied. At present, most researches on gas adsorption are carried out under a macroscopic angle, only the mechanical properties of a gas-containing coal body can be explored, and industrial CT experimental equipment can realize the dynamic evolution process of the internal fracture of the coal body under microscopic and microscopic angles. Because CT test equipment is more precise, the requirement on the test is higher, the matching difficulty with a gas adsorption test device is higher, and although a test system combining two systems together exists at present, the defects exist that firstly, the microstructure of a coal body is influenced during gas adsorption, the mechanical property of the coal body is deteriorated, and the existing device and system can only scan the state before and after the coal body is adsorbed, but cannot realize the real-time observation of the dynamic evolution of a coal sample crack in the gas adsorption process; secondly, when the coal body breaks and the like, the gas adsorption reaches the peak value, however, the existing device cannot detect the gas adsorption quantity, and cannot carry out quantitative analysis on the experimental result.
Disclosure of Invention
The invention mainly aims to provide an industrial CT gas adsorption experiment system and a using method thereof, and aims to solve the technical problems in the prior art.
In order to achieve the above object, the present invention provides an industrial CT gas adsorption experimental system, comprising,
the gas supply system adjusts the gas flow rate by controlling the pressure difference and transmits gas into the pipeline;
and the loading system is communicated with the gas supply system, applies axial pressure and confining pressure to the sample by taking water as a pressurizing medium, and transmits the coal sample in an all-dimensional real-time scanning mode to obtain the internal fracture evolution rule of the coal sample in the adsorption process.
Further, the gas supply system includes the gas cylinder that has inlet port and venthole, the barometer of being connected with the inlet port, the pneumatic valve of being connected with the venthole and the pipeline that is used for carrying gas, be equipped with the partial pressure monitoring table that is used for regulating and control the decompression valve of atmospheric pressure and detects pressure difference with the barometer cooperation on the pipeline.
Furthermore, the loading system comprises an X-ray source for transmitting the coal sample in an omnibearing scanning mode, a receiving plate for collecting attenuated ray information, a clamp, an axial pressure loading device and a confining pressure loading device which are arranged in the clamp and used for applying axial pressure and confining pressure to the sample through inputting water and adjusting the water flow rate to control the axial pressure and the lateral pressure, a gas seepage device and a computer for processing the image of the detected layer.
Furthermore, the loading system also comprises a rubber sleeve which is arranged in the clamp holder and used for wrapping the coal sample entering the system.
Further, the gas flow real-time detection system is used for monitoring the gas flow rate and the total gas flow in real time and comprises a first gas detector and a second gas detector.
Further, still include tail gas collecting system, communicate with the loading system, tail gas collecting system is including the main barrel that is used for collecting tail gas, the outer air feed pipe of being connected with the main barrel and locate the check valve in the outer air feed pipe.
The device further comprises a degassing system, wherein the degassing system comprises a vacuum pump with an air inlet and an air outlet, a liquid tank with the air inlet connected with the air outlet of the vacuum pump, a water collecting bottle and a guide pipe with one end extending to the position below the liquid level of the liquid tank and the other end connected with the water collecting bottle, the air inlet of the vacuum pump is connected with a loading system, and a digital display vacuum gauge is arranged on one side of the vacuum pump.
Further, the gas flow control device further comprises a first valve, a second valve, a third valve, a fourth valve and a fifth valve which are used for controlling the gas flow.
A using method of an industrial CT gas adsorption experiment system comprises the following steps,
the method comprises the following steps: preparation before experiment, gas in the whole system pipeline is extracted by a degassing system, treated and the volume V of the gas is recorded1。
Step two: unscrewing a gas valve, controlling a gas tank to provide constant-pressure gas into the experimental device by adjusting a pressure-reducing valve, carrying out real-time microscopic observation on a coal sample in a loading system by utilizing observation equipment, recording readings of two gas detectors when the coal sample has obvious pores for the first time, and calculating a difference value V of the readings2。
Step three: continuously filling gas into the loading system, observing the first occurrence of obvious cracks penetrating through the upper and lower surfaces of the coal sample, and recording the gas flow difference V3。
Step four: when the difference value between the inflow air pressure and the output air pressure fluctuates slightly and tends to be stable, the coal body reaches the adsorption peak value, and the gas adsorption limit quantity V of the coal sample can be recorded4. Therefore, the real-time degradation degree of the gas to the coal body and the real-time monitoring data of the gas adsorption amount of the coal body can be observed from a microscopic angle.
Step five: after the test is finished, residual gas in the pipeline and the device is extracted and collected by the degassing system, so that the gas is prevented from causing harm to the environment.
The invention has the beneficial effects that:
the method is suitable for measuring the gas adsorption quantity of the coal and the real-time deterioration degree of the gas to the coal body, can measure parameters such as the deterioration mechanism, the mechanical property, the permeability coefficient, the gas adsorption quantity and the like of the coal sample under the conditions of different axial pressures, different confining pressures and different gas supply pressures, is suitable for the test of the coal gas adsorption rule, can accurately simulate the underground reservoir environment, and has high test efficiency.
The gas flow of the invention is automatically collected by the gas detector, thereby reducing the error of manual reading, having high collection precision and improving the accuracy and efficiency of the experiment.
The gas is collected, so that the harm of residual gas and other gases to human bodies and the environment is prevented, the safety of testers is ensured, and the safety coefficient of an experimental system is increased.
Drawings
FIG. 1 is a schematic diagram of an experimental system according to the present invention;
FIG. 2 is a schematic diagram of a loading system according to the present invention.
Description of reference numerals:
1. a gas cylinder; 2. an air valve; 3. a barometer; 4. a first valve; 5. a pressure reducing valve; 6. a partial pressure monitoring meter; 7. a first gas detector; 8. a second valve; 9. a holder; 10. a second gas detector; 11. a third valve; 12. an outer gas supply pipe; 13. a one-way valve; 14. a main cylinder; 15. a fourth valve; 16. a digital display vacuum gauge; 17. a vacuum pump; 18. a fifth valve; 19. a liquid tank; 20. a conduit; 21. a water collecting bottle; 22. a computer; 23. a gas infiltration device; 24. a shaft pressure loading device; 25. a confining pressure loading device; 26. a rubber sleeve; 27. an X-ray source; 28. and receiving the board.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, "a plurality" means two or more. In addition, technical solutions between the various embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, the technical solutions should be considered to be absent.
Referring to fig. 1 and 2, an industrial CT gas adsorption experiment system of the present invention includes,
the gas supply system adjusts the gas flow rate by controlling the pressure difference and transmits gas into the pipeline;
and the loading system is communicated with the gas supply system, applies axial pressure and confining pressure to the sample by taking water as a pressurizing medium, and transmits the coal sample in an all-dimensional real-time scanning mode to obtain an internal fracture evolution rule in the adsorption process.
The gas supply system outputs gas at constant gas pressure, the loading system applies axial pressure and confining pressure to the sample through input water, the water flow rate is adjusted to control the axial pressure and the lateral pressure, attenuated ray information is collected, a detected layer image is visually displayed in a two-dimensional gray image mode through a specific algorithm, and real-time dynamic monitoring of the loaded sample in the gas adsorption damage process can be achieved through observation and analysis of the image.
The device is suitable for measuring the adsorption quantity of coal to gas and the real-time degradation degree of gas to coal, can measure parameters such as degradation mechanism, mechanical property, permeability coefficient, gas adsorption quantity and the like of coal samples under the conditions of different axial pressures, different confining pressures and different gas supply pressures, is suitable for testing the adsorption rule of granular coal gas, can accurately simulate the underground reservoir environment, and is high in experimental efficiency.
In an embodiment, referring to fig. 1, the gas supply system includes a gas cylinder 1 having an inlet hole and an outlet hole, a barometer 3 connected to the inlet hole, a gas valve 2 connected to the outlet hole, and a pipeline for conveying gas, and the pipeline is provided with a pressure reducing valve 5 for regulating and controlling the gas pressure and a partial pressure monitoring meter 6 cooperating with the barometer 3 to detect a pressure difference. The gas cylinder 1 has gas outlet hole for outputting gas to the pipeline, the gas is regulated via the pressure reducing valve 5 to produce pressure difference with the gas valve 2, and the pressure difference is calculated via the barometer 3 and the partial pressure monitor 6.
In one embodiment, referring to fig. 2, the loading system includes an X-ray source 27 for transmitting the coal sample in an omni-directional scanning manner, a receiving plate 28 for collecting attenuated ray information, a holder 9, an axial pressure loading device 24 and a confining pressure loading device 25 which are arranged in the holder 9 and used for applying axial pressure and confining pressure to the sample through input water and adjusting the water flow rate to control the magnitude of the axial pressure and the lateral pressure, a gas infiltration device 23, and a computer for processing the image of the detected bedding plane. The sample enters the holder 9 through the gas seepage device 23, the axial pressure loading device 24 and the confining pressure loading device 25 in the holder 9 apply axial pressure and confining pressure to the sample through input water, the water flow rate is adjusted to control the axial pressure and the lateral pressure, the X-ray source 27 transmits the coal sample in an all-dimensional scanning mode, attenuated ray information is collected through the receiving plate 28, a detected layer image is visually displayed in a two-dimensional gray image mode by applying a specific algorithm in the computer 22, and real-time dynamic monitoring of the loaded sample in the gas adsorption destruction process can be realized through observation and analysis of the image.
In one embodiment, referring to fig. 1, the loading system further includes a rubber sleeve 26 disposed within the holder for wrapping the coal sample entering the system. The coal sample outside is prevented the moisture invasion by rubber sleeve 26 parcel, avoids causing the interference in the testing process.
In an embodiment, please refer to fig. 1, further comprising a real-time gas flow detection system for monitoring the gas flow rate and the total gas flow rate in real time, wherein the real-time gas flow detection system comprises a first gas detector 7 and a second gas detector 10. The first gas detector 7 is used for detecting the flow of gas introduced at the beginning of an experiment, and the second gas detector 10 is used for detecting the total flow of residual gas after part of gas is adsorbed by a coal sample during the experiment.
In an embodiment, please refer to fig. 1, further comprising an exhaust gas collecting system, which is communicated with the loading system, wherein the exhaust gas collecting system comprises a main cylinder 14 for collecting exhaust gas, an external air supply pipe 12 connected to the main cylinder 14, and a one-way valve 13 disposed in the external air supply pipe 12. After the experiment, the residual gas enters the main cylinder 14, the gas enters the main cylinder 14 through the one-way valve 13 arranged at the top end of the pipeline, and the one-way valve 13 only allows the gas to enter the main cylinder 14 from the pipeline and does not allow the gas to flow backwards into the second gas detector 10.
In one embodiment, please refer to fig. 1, further comprising a degassing system, wherein the degassing system comprises a vacuum pump 17 having an air inlet and an air outlet, a liquid tank 19 having an air inlet connected to the air outlet of the vacuum pump 17, a water collecting bottle 21, and a conduit 20 having one end extending to a position below the liquid level of the liquid tank 19 and the other end connected to the water collecting bottle 21, the air inlet of the vacuum pump 17 is connected to the loading system, and a digital display vacuum gauge 16 is disposed on one side of the vacuum pump 17. The air tightness detection is carried out before the experiment, so that the problems of experiment quality reduction and surrounding environment pollution caused by insufficient air tightness are avoided; the gas in the connected pipeline is subjected to vacuum pumping treatment by a vacuum pump 17, the gas enters a liquid tank 19, the pressure principle shows that under the action of pressure, liquid with the same volume as the sucked gas enters a water collecting bottle 21 along with a conduit 20 to be collected, the volume of the liquid can be calculated, and the negative pressure index of the gas sucked by the vacuum pump 17 can be regulated and observed by a digital display vacuum gauge 16.
In one embodiment, referring to fig. 1, the gas flow control device further includes a first valve 4, a second valve 8, a third valve 11, a fourth valve 15, and a fifth valve 18 for controlling the gas flow. Respectively used for controlling the opening and the closing of a gas flow channel in the pipeline.
A using method of an industrial CT gas adsorption experiment system comprises the following steps,
the method comprises the following steps: preparation before experiment, gas in the whole system pipeline is extracted by a degassing system, treated and the volume V of the gas is recorded1。
Step two: unscrewing a gas valve, controlling a gas tank to provide constant-pressure gas into the experimental device by adjusting a pressure reducing valve 5, carrying out real-time microscopic observation on a coal sample in a loading system by utilizing observation equipment, recording readings of two gas detectors when the coal sample has obvious pores for the first time, and calculating a difference value V of the readings2。
Step three: continuously filling gas into the loading system, observing the first occurrence of obvious cracks penetrating through the upper and lower surfaces of the coal sample, and recording the gas flow difference V3。
Step four: when the difference value between the inflow air pressure and the output air pressure fluctuates slightly and tends to be stable, the coal body reaches the adsorption peak value, and the coal sample gas adsorption limit quantity V can be recorded4. Therefore, the real-time degradation degree of the gas to the coal body and the real-time monitoring data of the gas adsorption amount of the coal body can be observed from a microscopic angle.
Step five: after the test is finished, residual gas in the pipeline and the device is extracted and collected by the degassing system, so that the gas is prevented from causing damage to the environment.
During the experiment preparation stage, firstly, the airtightness detection is carried out, nitrogen is introduced at an inlet, the third valve 11 and the fourth valve 15 are in a closed state, after a proper amount of gas is injected, the first valve 4 and the second valve 8 are respectively closed, whether the gas pressure in each closed stage reaches balance is observed to measure the airtightness of the pipeline, after the detection is finished, the gas is discharged and stands still, when the pressure in the trachea is equal to the atmospheric pressure, the experiment is started, the first valve 4 and the third valve 11 are closed, the second valve 8, the fourth valve 15 and the fifth valve 18 are opened, the gas in the connected pipeline is subjected to vacuum pumping treatment by the vacuum pump 17, the gas enters the liquid tank 19, the liquid which absorbs the gas and enters the water collecting bottle 21 along with the catheter 20 under the pressure action according to the principle of equal volume of pressure, the liquid volume can be calculated, and the negative pressure index of the gas absorbed by the vacuum pump 17 can be regulated and observed by the digital display vacuum meter 16.
After the preparation stage is finished, the fifth valve 18 is closed, the hydraulic steam is prevented from being poured into the vacuum pump 17 to damage experimental equipment, meanwhile, the third valve 11 is closed, the first valve 4, the second valve 8, the third valve 11 and the gas valve 2 are opened, gas is output into a pipeline from a gas outlet hole of the gas cylinder 1 at constant gas pressure, the gas is subjected to pressure regulation and control through the pressure reducing valve 5, pressure difference is generated between the gas and the gas valve 2, the pressure difference is calculated through the gas pressure meter 3 and the partial pressure monitoring meter 6, the gas flows are monitored through the first gas detector 7 and enter the holder 9 through the gas seepage device 23, axial pressure and confining pressure are applied to a sample through water input by the axial pressure loading device 24 and the confining pressure loading device 25 in the holder 9, the water flow rate is regulated to control the axial pressure and the lateral pressure, the outer side of the coal sample is wrapped by the rubber sleeve 26 to prevent water intrusion, the X-ray source 22 transmits the coal sample in an omnibearing scanning mode, attenuated ray information is collected through the receiving plate 28, a specific algorithm is applied in the computer 22 to display a two-dimensional gray scale image, the damage image is visually observed, and the gas sample can be monitored in a dynamic process of the gas-borne sample under the real-time observation. After a part of gas is adsorbed by the coal sample, the gas flows to the second gas detector 10 through the clamper 9, the total flow of the residual gas is recorded, and the real-time gas flow difference of the two gas detectors is displayed by the computer 22.
Therefore, gas enters the main cylinder 14, one side of the main cylinder 14 is connected with the external gas supply pipe 12, the one-way valve 13 is arranged on the inner side of the pipeline, the gas enters the main cylinder 14 through the one-way valve 13 arranged at the top end of the pipeline, and the one-way valve 413 only allows the gas to enter the main cylinder 14 from the pipeline and does not allow the gas to flow backwards into the second gas detector 10.
After the test is finished, the gas valve 2, the first valve 4 and the third valve 11 are closed, the fourth valve 15 and the fifth valve 18 are opened, and residual gas in the pipeline and the device is sucked by the vacuum pump 17, so that the gas is prevented from causing harm to the environment.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an industry CT gas adsorption experiment system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the gas supply system adjusts the gas flow rate by controlling the pressure difference and transmits gas into the pipeline;
and the loading system is communicated with the gas supply system, applies axial pressure and confining pressure to the sample by taking water as a pressurizing medium, and transmits the coal sample in an all-dimensional real-time scanning mode to obtain the internal fracture evolution rule of the coal sample in the adsorption process.
2. The industrial CT gas adsorption experimental system of claim 1, wherein: the gas supply system comprises a gas cylinder (1) with an air inlet hole and an air outlet hole, a barometer (3) connected with the air inlet hole, an air valve (2) connected with the air outlet hole and a pipeline for conveying gas, wherein a pressure reducing valve (5) used for regulating and controlling air pressure and a partial pressure monitoring meter (6) matched with the barometer (3) to detect a pressure difference value are arranged on the pipeline.
3. The industrial CT gas adsorption experimental system of claim 2, wherein: the loading system comprises an X-ray source (27) for transmitting a coal sample in an omnibearing scanning mode, a receiving plate (28) for acquiring attenuated ray information, a clamp holder (9), an axial pressure loading device (24) and a confining pressure loading device (25) which are arranged in the clamp holder (9) and used for applying axial pressure and confining pressure to the sample through input water and adjusting the water flow rate to control the axial pressure and the lateral pressure, a gas seepage device (23) and a computer (22) for processing an image of a detected bedding surface.
4. The industrial CT gas adsorption experimental system of claim 3, wherein: the loading system also comprises a rubber sleeve (26) which is arranged in the clamp holder (9) and is used for wrapping the coal sample entering the system.
5. The industrial CT gas adsorption experiment system of claim 4, wherein: the gas flow real-time detection system is used for monitoring the gas flow rate and the total gas flow in real time and comprises a first gas detector (7) and a second gas detector (10).
6. The industrial CT gas adsorption experimental system of claim 5, wherein: still include tail gas collection system, communicate with the loading system, tail gas collection system is including main barrel (14) that are used for collecting tail gas, outer air feed pipe (12) be connected with main barrel (14) and locate check valve (13) in outer air feed pipe (12).
7. The industrial CT gas adsorption experimental system of claim 6, wherein: the device is characterized by further comprising a degassing system, the degassing system comprises a vacuum pump (17) with an air inlet and an air outlet, a liquid tank (19) with the air inlet connected with the air outlet of the vacuum pump (17), a water collecting bottle (21) and a conduit (20) with one end extending to the position below the liquid level of the liquid tank (19) and the other end connected with the water collecting bottle (21), the air inlet of the vacuum pump (17) is connected with a loading system, and a digital display vacuum gauge (16) is arranged on one side of the vacuum pump (17).
8. The industrial CT gas adsorption experimental system of claim 1, wherein: also included are a first valve (4), a second valve (8), a third valve (11), a fourth valve (15), and a fifth valve (18) for controlling the flow of gas.
9. The method of any one of claims 1 to 8, wherein the industrial CT gas adsorption experiment system comprises: comprises the following steps of (a) preparing a solution,
the method comprises the following steps: preparation before experiment, gas in the whole system pipeline is extracted by a degassing system, treated and the volume V of the gas is recorded1。
Step two: unscrewing a gas valve, controlling a gas tank to provide constant-pressure gas into the experimental device by adjusting a screwing decompression valve (5), carrying out real-time microscopic observation on a coal sample in a loading system by utilizing observation equipment, recording readings of two gas detectors when the coal sample has obvious pores for the first time, and calculating a difference value V of the readings2。
Step three: continuously filling gas into the loading system, observing the first occurrence of obvious cracks penetrating through the upper and lower surfaces of the coal sample, and recording the gas flow difference V3。
Step four: when the difference value between the inflow air pressure and the output air pressure fluctuates slightly and tends to be stable, the coal body reaches the adsorption peak value, and the gas adsorption limit quantity V of the coal sample can be recorded4. Therefore, the real-time degradation degree of the gas to the coal body and the real-time monitoring data of the gas adsorption amount of the coal body can be observed from a microscopic angle.
Step five: after the test is finished, residual gas in the pipeline and the device is extracted and collected by the degassing system, so that the gas is prevented from causing harm to the environment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116148036A (en) * | 2023-01-04 | 2023-05-23 | 安徽理工大学 | Experimental device and method capable of measuring strain field of loading process of gas-containing coal rock mass |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116148036A (en) * | 2023-01-04 | 2023-05-23 | 安徽理工大学 | Experimental device and method capable of measuring strain field of loading process of gas-containing coal rock mass |
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Application publication date: 20221101 |