CN109991149A - A kind of three axis seepage apparatus and operating method changing mixed gas density - Google Patents
A kind of three axis seepage apparatus and operating method changing mixed gas density Download PDFInfo
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- CN109991149A CN109991149A CN201910381791.XA CN201910381791A CN109991149A CN 109991149 A CN109991149 A CN 109991149A CN 201910381791 A CN201910381791 A CN 201910381791A CN 109991149 A CN109991149 A CN 109991149A
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- 238000011017 operating method Methods 0.000 title claims abstract description 6
- 239000003245 coal Substances 0.000 claims abstract description 34
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 13
- 238000002474 experimental method Methods 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 85
- 238000000034 method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of three axis seepage apparatus of changeable mixed gas density and operating methods, it includes mixed gas feed system, and mixed gas feed system and gas mixing system pass through piping connection；Gas mixing system and triaxial pressure system pass through piping connection；Triaxial pressure system and vacuum degassing system pass through piping connection；Vacuum degassing system and flow measuring systems pass through piping connection；The gas mixing system includes gas mixing chamber (10), is equipped with Gas Density Sensor (25) in gas mixing chamber (10), Gas Density Sensor (25) is connect with manoscope (9) by conducting wire；Solve the technical problems such as the variation of three axis seepage apparatus simulation coal mining scene mixed gas density of the not changeable mixed gas density of the prior art.
Description
Technical field
The invention belongs to three axis seepage flow seepage flow technical fields more particularly to a kind of three axis seepage flow for changing mixed gas density
Device and operating method.
Background technique
The coal resources of the rich reserves in China contain a large amount of coal bed gas resources in coal seam, under complicated reservoir conditions,
Gas in gas porous flow channel has different density.During Methane Transport in Coal Seam, permeability is reflection coal seam Neva
One of this seepage flow complexity important parameter, meanwhile, permeability is also a crucial research side of gas porous flow mechanics and engineering
To.Therefore, the measuring method research of coal-bed gas permeability is most important to gas porous flow Mechanics Development, while coal and gas are prominent
A series of mine safety problems demands are solved out etc..And gas is that one kind contains CH4And CO2Etc. various mixed gases composition
Gas studies influence of the density of mixed gas to coal permeability and is of great significance, and there are no changeable mixing so far
Three axis seepage apparatus of gas density, it is therefore necessary to which certain improvement is carried out to simulate coal mine to existing three axis seepage apparatus
Exploit the variation of live mixed gas density.
Summary of the invention
The technical problem to be solved by the present invention is provide it is a kind of change mixed gas density three axis seepage apparatus and operation
Method simulates coal mining scene gaseous mixture to solve three axis seepage apparatus of the not changeable mixed gas density of the prior art
The technical problems such as the variation of volume density.
Technical solution of the present invention:
A kind of three axis seepage apparatus changing mixed gas density, it includes mixed gas feed system, mixed gas supply system
System passes through piping connection with gas mixing system；Gas mixing system and triaxial pressure system pass through piping connection；Triaxial pressure
System and vacuum degassing system pass through piping connection；Vacuum degassing system and flow measuring systems pass through piping connection；The gas
Body hybrid system includes gas mixing chamber, and gas mixing is intracavitary to be equipped with Gas Density Sensor, Gas Density Sensor and gas
Volume density analyzer is connected by conducting wire.
The mixed gas feed system includes the first air accumulator and the second air accumulator；First air accumulator and gas mixing system
The first pressure reducing valve, first pressure gauge and first switch valve are sequentially installed on the pipeline of system connection；Second air accumulator and gas are mixed
The second pressure reducing valve, second pressure gauge and second switch valve are sequentially installed on the pipeline of collaboration system connection.
Triaxial pressure system includes triaxial cell, and the mistress of triaxial cell passes through axis pressure pipe and confining pressure pipe connecting shaft pressure
Pump and confining pressure pump；Third pressure gauge is sequentially installed on gas mixing system and the connecting line of triaxial pressure system and third subtracts
Pressure valve.
Vacuum degassing system includes vacuum pump, and vacuum pump and the outlet end of triaxial pressure system pass through piping connection；In pipe
Road is sequentially installed with pressure gauge, the 4th pressure reducing valve and flanged valve.
Flow measuring systems include flowmeter, and flowmeter and vacuum degassing system pass through piping connection；Pacify on connecting line
Equipped with check-valves.
A kind of operating method of three axis seepage apparatus of change mixed gas density, it includes:
Step 1, the confining pressure that standard-sized coal body test specimen is mounted on triaxial cell are intracavitary, open vacuum pump later for coal sample
Flanged valve is closed after being de-gassed six hours with experimental provision；
Step 2 is pressed with confining pressure value to set axis is tested to simulate coal on ground by adjustment axis pressure oil pump and confining pressure oil pump
Stress state suffered by bottom；
Step 3 opens the first pressure reducing valve, first switch valve, the second pressure reducing valve and second switch valve, and two different gases is allowed to exist
Mixing in mixing arrangement observes the gas density in gas mixer by manoscope；
Step 4, by opening the first pressure reducing valve and first switch valve or the second pressure reducing valve and second switch valve come regulating gas
The density of mixed gas in mixing chamber；
By adjusting third pressure reducing valve and according to third pressure gauge when step 5, the mixed gas density value needed for reaching experiment
Reading, which makes gas reach authorized pressure, makes experiment coal sample adsorb twenty four hours under mixed gas effect；
Step 6 adjusts the variation that third pressure reducing valve simulates coal pore pressure in coal petrography recovery process to test desirable value, wait flow
Flow value is recorded after meter stable reading；
Step 7 finally calculates mixed gas and acts on coal permeability value under lower different densities, axis pressure and confining pressure coupling.
The invention has the advantages that:
The present invention, by the gas mixing of two gas tanks, connects manoscope in gas mixing chamber by gas mixing system
Observe the gas density in gas mixer；And by open the first pressure reducing valve and first switch valve or the second pressure reducing valve and
Second switch valve carrys out the density of mixed gas in regulating gas mixing chamber；Pass through the outlet connected in triaxial cell's end port
The 4th pressure reducing valve valve that is successively arranged on pipe, precision pressure gauge are so as to control the size of outlet pressure, furthermore in three axis pressures
Power connects vacuum pump outside room, it is ensured that the intrusion for preventing foreign gas prevents foreign gas from causing error to experiment；The present invention
Raw coal can be made to carry out Seepage Experiment under different mixed gas density conditions, and be able to carry out not that coaxially pressure and confining pressure are more
Seepage Experiment under factor coupling condition, can in real simulation process of coal mining mixed gas Seepage Experiment, experiment dress
Set simple to operation, using effect is good, easy to spread；Three axis for solving the not changeable mixed gas density of the prior art seep
Flow the technical problems such as the variation of unit simulation coal mining scene mixed gas density.
Detailed description of the invention
Fig. 1 is the whole structural schematic diagram of the present invention；
Fig. 2 is the structural schematic diagram of gas mixer of the present invention；
In figure: the first air accumulator of 1-, the second air accumulator of 2-, 3- first pressure gauge, the first pressure reducing valve of 4-, the second pressure reducing valve of 5-, 6-
Second pressure gauge, 7- first switch valve, 8- second switch valve, 9- manoscope, 10- gas mixing chamber, 11- third pressure
Power table, 12- third pressure reducing valve, the triaxial cell 13-, 14- axis press pump, 15- confining pressure pump, 16- precision pressure gauge, 17- the 4th subtract
Pressure valve, 18- flanged valve, 19- vacuum pump, 20- check-valves, 21- flowmeter, the first gas storage of 22- pipeline, the second gas storage of 23- pipeline,
24- display, 25- Gas Density Sensor, 26- outlet pipe, 27- mixed gas case.
Specific embodiment
A kind of three axis seepage apparatus of changeable mixed gas pH value, please refer to Fig. 1-2.
The device includes that mixed gas feed system, mixed gas feed system and gas mixing system are connected by pipeline
It connects；Gas mixing system and triaxial pressure system pass through piping connection；Triaxial pressure system and vacuum degassing system pass through pipeline
Connection；Vacuum degassing system and flow measuring systems pass through piping connection；The gas mixing system includes gas mixing chamber 10,
Gas Density Sensor 25 is installed, Gas Density Sensor 25 is with manoscope 9 by leading in gas mixing chamber 10
Line connection.
Mixed gas feed system includes the first air accumulator 1 and the second air accumulator 2；First air accumulator 1 and gas mixing system
The first pressure reducing valve 4, first pressure gauge 3 and first switch valve 7 are sequentially installed on the pipeline of system connection；Second air accumulator 2 and gas
The second pressure reducing valve 5, second pressure gauge 6 and second switch valve 8 are sequentially installed on the pipeline of body hybrid system connection.Triaxial pressure
System includes triaxial cell 18, and mistress passes through axis pressure pipe and confining pressure pipe connecting shaft press pump 17 and confining pressure pump 19；Gas mixing system
The 5th pressure gauge 15 and the 4th pressure reducing valve 16 are sequentially installed on system and the connecting line of triaxial pressure system.
Vacuum degassing system includes vacuum pump 19, and vacuum pump 19 and the outlet end of triaxial pressure system pass through piping connection；
Pressure gauge 16, the 4th pressure reducing valve 17 and flanged valve 18 are sequentially installed on pipeline.
Flow measuring systems include flowmeter 21, are equipped with non-return on flowmeter 21 and the connecting line of vacuum degassing system
Valve 20.
In use, the confining pressure that standard-sized coal body test specimen is mounted on as required in triaxial cell 13 first is intracavitary,
It is opened after coal sample and experimental provision are de-gassed six hours by vacuum pump 19 later and closes flanged valve 18, then pass through adjustment axis
Pressure oil pump 14 and confining pressure oil pump 15 to the set axis pressure of experiment simulate coal stress state suffered by ground end with confining pressure value, beat
The first pressure reducing valve 4, first switch valve 7, the second pressure reducing valve 5, second switch valve 8 are opened, when two different gases are in mixing arrangement
Mixing in 10 observes the gas density in gas mixer 10 by manoscope 9；And by opening the first decompression
Valve 4 and first switch valve 7 or the second pressure reducing valve 5 and second switch valve 8 carry out the density of mixed gas in regulating gas mixing chamber,
By adjusting third pressure reducing valve 12 and being made according to the reading of third pressure gauge 11 when the mixed gas density value needed for reaching experiment
Gas reaches authorized pressure and experiment coal sample is made to adsorb twenty four hours under mixed gas effect, adjusts third pressure reducing valve later
12 simulate the variation of coal pore pressure in coal petrography recovery process to test desirable value, and stream is recorded after 21 stable reading of flowmeter
Magnitude calculates mixed gas finally by formula and acts on coal permeability under the couplings such as lower different humidity, axis pressure, confining pressure
Value.
Claims (6)
1. a kind of three axis seepage apparatus for changing mixed gas density, it includes mixed gas feed system, it is characterised in that: mixed
It closes gas supply system and gas mixing system passes through piping connection；Gas mixing system and triaxial pressure system are connected by pipeline
It connects；Triaxial pressure system and vacuum degassing system pass through piping connection；Vacuum degassing system and flow measuring systems pass through pipeline
Connection；The gas mixing system includes gas mixing chamber (10), is equipped with Gas Density Sensor in gas mixing chamber (10)
(25), Gas Density Sensor (25) is connect with manoscope (9) by conducting wire.
2. a kind of three axis seepage apparatus for changing mixed gas density according to claim 1, it is characterised in that: described mixed
Closing gas supply system includes the first air accumulator (1) and the second air accumulator (2)；First air accumulator (1) and gas mixing system connect
The first pressure reducing valve (4), first pressure gauge (3) and first switch valve (7) are sequentially installed on the pipeline connect；Second air accumulator (2)
The second pressure reducing valve (5), second pressure gauge (6) and second switch valve are sequentially installed on the pipeline connecting with gas mixing system
(8).
3. a kind of three axis seepage apparatus for changing mixed gas density according to claim 1, it is characterised in that: three axis pressures
Force system includes triaxial cell (13), and the mistress of triaxial cell (13) passes through axis pressure pipe and confining pressure pipe connecting shaft press pump (14)
(15) are pumped with confining pressure；Be sequentially installed on the connecting line of gas mixing system and triaxial pressure system third pressure gauge (11) and
Third pressure reducing valve (12).
4. a kind of three axis seepage apparatus for changing mixed gas density according to claim 1, it is characterised in that: vacuum is de-
Gas system includes vacuum pump (19), and vacuum pump (19) and the outlet end of triaxial pressure system pass through piping connection；On pipeline according to
It is secondary that pressure gauge (16), the 4th pressure reducing valve (17) and flanged valve (18) are installed.
5. a kind of three axis seepage apparatus for changing mixed gas density according to claim 1, it is characterised in that: flow is surveyed
Determining system includes flowmeter (21), and flowmeter (21) and vacuum degassing system pass through piping connection；It is equipped with only on connecting line
It returns valve (20).
6. a kind of operating method of three axis seepage apparatus for changing mixed gas density as described in claim 1, it includes:
Step 1, the confining pressure that standard-sized coal body test specimen is mounted on triaxial cell (13) are intracavitary, open vacuum pump later
(19) flanged valve (18) are closed after being de-gassed coal sample and experimental provision six hours；
Step 2 extremely tests set axis pressure by adjustment axis pressure oil pump (14) and confining pressure oil pump (15) with confining pressure value thus mould
Quasi- coal stress state suffered by ground end；
Step 3 opens the first pressure reducing valve (4), first switch valve (7), the second pressure reducing valve (5) and second switch valve (8), allows two kinds
Different gas mixing in mixing arrangement (10), by manoscope (9) observation gas mixer (10)
Gas density；
Step 4 passes through opening the first pressure reducing valve (4) and first switch valve (7) or the second pressure reducing valve (5) and second switch valve
(8) carry out the density of mixed gas in regulating gas mixing chamber；
By adjusting third pressure reducing valve (12) and according to third pressure when step 5, the mixed gas density value needed for reaching experiment
Power table (11) reading make gas reach authorized pressure make test coal sample mixed gas effect under adsorb twenty four hours；
Step 6 adjusts the variation that third pressure reducing valve (12) simulate coal pore pressure in coal petrography recovery process to test desirable value,
Flow value is recorded after flowmeter (21) stable reading；
Step 7 finally calculates mixed gas and acts on coal permeability value under lower different densities, axis pressure and confining pressure coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910381791.XA CN109991149A (en) | 2019-05-08 | 2019-05-08 | A kind of three axis seepage apparatus and operating method changing mixed gas density |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910381791.XA CN109991149A (en) | 2019-05-08 | 2019-05-08 | A kind of three axis seepage apparatus and operating method changing mixed gas density |
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| CN109991149A true CN109991149A (en) | 2019-07-09 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884328A (en) * | 2017-12-01 | 2018-04-06 | 贵州大学 | A kind of three axle seepage apparatus for measuring mixed gas content change |
| CN107884309A (en) * | 2017-12-01 | 2018-04-06 | 贵州大学 | A kind of three axle seepage apparatus of mixed gas condition lower outlet end malleation |
| CN107907466A (en) * | 2017-12-01 | 2018-04-13 | 贵州大学 | It is a kind of to change gas humidity and three axis seepage apparatus of port of export positive pressure |
| CN108037059A (en) * | 2017-12-28 | 2018-05-15 | 贵州大学 | A kind of three axis seepage apparatus for changing gas temperature port of export positive pressure |
| CN211402060U (en) * | 2019-05-08 | 2020-09-01 | 贵州大学 | Triaxial seepage device for changing density of mixed gas |
-
2019
- 2019-05-08 CN CN201910381791.XA patent/CN109991149A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884328A (en) * | 2017-12-01 | 2018-04-06 | 贵州大学 | A kind of three axle seepage apparatus for measuring mixed gas content change |
| CN107884309A (en) * | 2017-12-01 | 2018-04-06 | 贵州大学 | A kind of three axle seepage apparatus of mixed gas condition lower outlet end malleation |
| CN107907466A (en) * | 2017-12-01 | 2018-04-13 | 贵州大学 | It is a kind of to change gas humidity and three axis seepage apparatus of port of export positive pressure |
| CN108037059A (en) * | 2017-12-28 | 2018-05-15 | 贵州大学 | A kind of three axis seepage apparatus for changing gas temperature port of export positive pressure |
| CN211402060U (en) * | 2019-05-08 | 2020-09-01 | 贵州大学 | Triaxial seepage device for changing density of mixed gas |
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