CN211402060U - Triaxial seepage device for changing density of mixed gas - Google Patents
Triaxial seepage device for changing density of mixed gas Download PDFInfo
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- CN211402060U CN211402060U CN201920653161.9U CN201920653161U CN211402060U CN 211402060 U CN211402060 U CN 211402060U CN 201920653161 U CN201920653161 U CN 201920653161U CN 211402060 U CN211402060 U CN 211402060U
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Abstract
The utility model discloses a triaxial seepage device capable of changing the density of mixed gas, which comprises a mixed gas supply system, wherein the mixed gas supply system is connected with a gas mixing system through a pipeline; the gas mixing system is connected with the triaxial pressure system through a pipeline; the three-axis pressure system is connected with the vacuum degassing system through a pipeline; the vacuum degassing system is connected with the flow measuring system through a pipeline; the gas mixing system comprises a gas mixing cavity (10), a gas density sensor (25) is arranged in the gas mixing cavity (10), and the gas density sensor (25) is connected with a gas density tester (9) through a lead; the technical problem that the prior art does not have a triaxial seepage device capable of changing the density of the mixed gas to simulate the density change of the mixed gas in a coal mining field is solved.
Description
Technical Field
The utility model belongs to the technical field of triaxial seepage flow, especially, relate to a change triaxial seepage flow device of mist density.
Background
The coal resources rich in reserves in China, a large amount of coal bed gas resources are contained in coal beds, and the coal beds are arranged in complicated reservoir stripsUnder the member, the gas in the gas seepage passage has different densities. In the process of coal seam gas migration, the permeability is one of important parameters for reflecting the difficulty degree of gas seepage in a coal seam, and meanwhile, the permeability is also a key research direction of gas seepage mechanics and engineering. Therefore, research on a measuring and calculating method of coal seam gas permeability is crucial to the development of gas seepage mechanics, and meanwhile, a series of mine safety problems such as coal and gas outburst need to be solved urgently. And the gas is a gas containing CH4And CO2The research on the influence of the density of the mixed gas on the coal permeability is of great significance when the gas is composed of various mixed gases, and no triaxial seepage device capable of changing the density of the mixed gas exists so far, so that certain improvement needs to be carried out on the existing triaxial seepage device to simulate the change of the density of the mixed gas in a coal mining site.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the utility model provides a change triaxial seepage flow device of mist density to solve prior art and do not have the triaxial seepage flow device that can change mist density and simulate the technical problem such as change of on-the-spot mist density of coal mining.
The utility model discloses technical scheme:
a triaxial seepage device for changing the density of mixed gas comprises a mixed gas supply system, wherein the mixed gas supply system is connected with a gas mixing system through a pipeline; the gas mixing system is connected with the triaxial pressure system through a pipeline; the three-axis pressure system is connected with the vacuum degassing system through a pipeline; the vacuum degassing system is connected with the flow measuring system through a pipeline; the gas mixing system comprises a gas mixing cavity, a gas density sensor is arranged in the gas mixing cavity, and the gas density sensor is connected with a gas density determinator through a lead.
The mixed gas supply system comprises a first gas storage tank and a second gas storage tank; a first pressure reducing valve, a first pressure gauge and a first switch valve are sequentially arranged on a pipeline for connecting the first gas storage tank and the gas mixing system; and a second pressure reducing valve, a second pressure gauge and a second switch valve are sequentially arranged on a pipeline for connecting the second gas storage tank and the gas mixing system.
The triaxial pressure system comprises a triaxial pressure chamber, and an outer chamber of the triaxial pressure chamber is connected with a pressure pump and a confining pressure pump through an axial pressure pipe and a confining pressure pipe; and a third pressure gauge and a third pressure reducing valve are sequentially arranged on a connecting pipeline of the gas mixing system and the triaxial pressure system.
The vacuum degassing system comprises a vacuum pump, and the vacuum pump is connected with the outlet end of the triaxial pressure system through a pipeline; and a pressure gauge, a fourth pressure reducing valve and a flange valve are sequentially arranged on the pipeline.
The flow measuring system comprises a flow meter, and the flow meter is connected with the vacuum degassing system through a pipeline; and a check valve is arranged on the connecting pipeline.
The operation method of the triaxial seepage device for changing the density of the mixed gas comprises the following steps:
step 1, mounting a coal body test piece with a standard size in a confining pressure cavity of a triaxial pressure chamber, then starting a vacuum pump to degas a coal sample and an experimental device for six hours, and then closing a flange valve;
step 2, simulating the stress state of the coal on the ground bottom by adjusting the axial pressure oil pump and the confining pressure oil pump to the axial pressure and confining pressure values set in the experiment;
step 3, opening the first pressure reducing valve, the first switch valve, the second pressure reducing valve and the second switch valve, mixing two different gases in the mixing device, and observing the gas density in the gas mixing device through a gas density measuring instrument;
step 4, adjusting the density of the mixed gas in the gas mixing cavity by opening the first pressure reducing valve and the first switch valve or opening the second pressure reducing valve and the second switch valve;
step 5, when the density value of the mixed gas required by the experiment is reached, adjusting a third pressure reducing valve and enabling the gas to reach the specified pressure according to the reading of a third pressure gauge so that the experimental coal sample is adsorbed for twenty-four hours under the action of the mixed gas;
and 7, finally, calculating the coal permeability values under the coupling action of different densities, axial pressures and confining pressures under the action of the mixed gas.
The utility model discloses beneficial effect:
the utility model mixes the gas of the two gas tanks by the gas mixing system, and the gas mixing cavity is connected with the gas density measuring instrument to observe the gas density in the gas mixing device; the density of the mixed gas in the gas mixing cavity is adjusted by opening the first pressure reducing valve and the first switch valve or the second pressure reducing valve and the second switch valve; the fourth pressure reducing valve and the precision pressure gauge are sequentially arranged on the gas outlet pipe connected with the tail end port of the three-shaft pressure chamber, so that the outlet pressure can be controlled, and in addition, the vacuum pump is connected with the three-shaft pressure chamber, so that the invasion of impurity gas can be prevented, and the error of the impurity gas on the experiment can be prevented; the utility model discloses can make the raw coal carry out the seepage flow experiment under the different mixed gas density condition to can carry out the seepage flow experiment under different axle load and confined pressure multifactor coupling condition, can really simulate the seepage flow experiment of mixed gas in the coal mining process, the experimental apparatus of this is simple and easy to operate, excellent in use effect, easily promotes; the technical problem that the prior art does not have a triaxial seepage device capable of changing the density of the mixed gas to simulate the density change of the mixed gas in a coal mining field is solved.
Drawings
Fig. 1 is a schematic overall structure diagram of the present invention;
FIG. 2 is a schematic structural view of the gas mixing device of the present invention;
in the figure: 1-a first gas storage tank, 2-a second gas storage tank, 3-a first pressure gauge, 4-a first pressure reducing valve, 5-a second pressure reducing valve, 6-a second pressure gauge, 7-a first switch valve, 8-a second switch valve, 9-a gas density tester, 10-a gas mixing cavity, 11-a third pressure gauge, 12-a third pressure reducing valve, 13-a triaxial pressure chamber and 14-an axial pressure pump, 15-confining pressure pump, 16-precision pressure gauge, 17-fourth pressure reducing valve, 18-flange valve, 19-vacuum pump, 20-check valve, 21-flowmeter, 22-first gas storage pipeline, 23-second gas storage pipeline, 24-display, 25-gas density sensor, 26-gas outlet pipeline and 27-mixed gas box.
Detailed Description
A triaxial seepage apparatus capable of changing the pH value of a mixed gas, please refer to FIGS. 1-2.
The device comprises a mixed gas supply system, wherein the mixed gas supply system is connected with a gas mixing system through a pipeline; the gas mixing system is connected with the triaxial pressure system through a pipeline; the three-axis pressure system is connected with the vacuum degassing system through a pipeline; the vacuum degassing system is connected with the flow measuring system through a pipeline; the gas mixing system comprises a gas mixing cavity 10, a gas density sensor 25 is arranged in the gas mixing cavity 10, and the gas density sensor 25 is connected with a gas density determinator 9 through a lead.
The mixed gas supply system comprises a first gas storage tank 1 and a second gas storage tank 2; a first pressure reducing valve 4, a first pressure gauge 3 and a first switch valve 7 are sequentially arranged on a pipeline connecting the first gas storage tank 1 and the gas mixing system; and a second pressure reducing valve 5, a second pressure gauge 6 and a second switch valve 8 are sequentially arranged on a pipeline for connecting the second gas storage tank 2 and the gas mixing system. The triaxial pressure system comprises a triaxial pressure chamber 18, and an outer chamber is connected with a pressure pump 17 and a confining pressure pump 19 through an axial pressure pipe and a confining pressure pipe; and a fifth pressure gauge 15 and a fourth pressure reducing valve 16 are sequentially arranged on a connecting pipeline of the gas mixing system and the triaxial pressure system.
The vacuum degassing system comprises a vacuum pump 19, and the vacuum pump 19 is connected with the outlet end of the triaxial pressure system through a pipeline; a pressure gauge 16, a fourth pressure reducing valve 17 and a flange valve 18 are sequentially installed on the pipeline.
The flow rate measuring system includes a flow meter 21, and a check valve 20 is installed on a connection line between the flow meter 21 and the vacuum degassing system.
When the device is used, firstly, a coal body test piece with a standard size is installed in a confining pressure cavity in a triaxial pressure chamber 13 as required, then a vacuum pump 19 is started to degas a coal sample and an experimental device for six hours, then a flange valve 18 is closed, then the axial pressure and confining pressure values set in the experiment are adjusted through an axial pressure oil pump 14 and a confining pressure oil pump 15, so that the stress state of the coal on the ground bottom is simulated, a first pressure reducing valve 4, a first switch valve 7, a second pressure reducing valve 5 and a second switch valve 8 are opened, when two different gases are mixed in a mixing device 10, and the gas density in the gas mixing device 10 is observed through a gas density measuring instrument 9; and the density of the mixed gas in the gas mixing cavity is adjusted by opening the first pressure reducing valve 4 and the first switch valve 7 or the second pressure reducing valve 5 and the second switch valve 8, when the density value of the mixed gas required by the experiment is reached, the third pressure reducing valve 12 is adjusted, the gas reaches the specified pressure according to the reading of the third pressure gauge 11, so that the experimental coal sample is adsorbed for twenty-four hours under the action of the mixed gas, then the third pressure reducing valve 12 is adjusted to the value required by the experiment to simulate the change of the pore pressure of the coal in the coal rock mining process, the flow value is recorded after the reading of the flowmeter 21 is stabilized, and finally the coal permeability values under the coupling action of different humidity, axial pressure, surrounding pressure and the like under the action of the mixed gas are calculated through.
Claims (4)
1. A triaxial seepage device for changing the density of mixed gas comprises a mixed gas supply system, and is characterized in that: the mixed gas supply system is connected with the gas mixing system through a pipeline; the gas mixing system is connected with the triaxial pressure system through a pipeline; the three-axis pressure system is connected with the vacuum degassing system through a pipeline; the vacuum degassing system is connected with the flow measuring system through a pipeline; the gas mixing system comprises a gas mixing cavity (10), a gas density sensor (25) is arranged in the gas mixing cavity (10), and the gas density sensor (25) is connected with a gas density tester (9) through a lead; the mixed gas supply system comprises a first gas storage tank (1) and a second gas storage tank (2); a first pressure reducing valve (4), a first pressure gauge (3) and a first switch valve (7) are sequentially arranged on a pipeline connecting the first gas storage tank (1) and the gas mixing system; a second pressure reducing valve (5), a second pressure gauge (6) and a second switch valve (8) are sequentially arranged on a pipeline for connecting the second gas storage tank (2) and the gas mixing system.
2. The triaxial apparatus for changing the density of a mixed gas according to claim 1, wherein: the triaxial pressure system comprises a triaxial pressure chamber (13), and an outer chamber of the triaxial pressure chamber (13) is connected with a pressure pump (14) and a confining pressure pump (15) through an axial pressure pipe and a confining pressure pipe; and a third pressure gauge (11) and a third pressure reducing valve (12) are sequentially arranged on a connecting pipeline of the gas mixing system and the triaxial pressure system.
3. The triaxial apparatus for changing the density of a mixed gas according to claim 1, wherein: the vacuum degassing system comprises a vacuum pump (19), and the vacuum pump (19) is connected with the outlet end of the three-axis pressure system through a pipeline; a pressure gauge (16), a fourth pressure reducing valve (17) and a flange valve (18) are sequentially arranged on the pipeline.
4. The triaxial apparatus for changing the density of a mixed gas according to claim 1, wherein: the flow measuring system comprises a flow meter (21), and the flow meter (21) is connected with the vacuum degassing system through a pipeline; a check valve (20) is arranged on the connecting pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920653161.9U CN211402060U (en) | 2019-05-08 | 2019-05-08 | Triaxial seepage device for changing density of mixed gas |
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| CN201920653161.9U CN211402060U (en) | 2019-05-08 | 2019-05-08 | Triaxial seepage device for changing density of mixed gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991149A (en) * | 2019-05-08 | 2019-07-09 | 贵州大学 | A kind of three axis seepage apparatus and operating method changing mixed gas density |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991149A (en) * | 2019-05-08 | 2019-07-09 | 贵州大学 | A kind of three axis seepage apparatus and operating method changing mixed gas density |
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