CN102147348B - Device and method for measuring gas permeation in coal - Google Patents
Device and method for measuring gas permeation in coal Download PDFInfo
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- CN102147348B CN102147348B CN2011100320059A CN201110032005A CN102147348B CN 102147348 B CN102147348 B CN 102147348B CN 2011100320059 A CN2011100320059 A CN 2011100320059A CN 201110032005 A CN201110032005 A CN 201110032005A CN 102147348 B CN102147348 B CN 102147348B
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Abstract
The invention discloses a device for measuring gas permeation in coal. The device comprises a sample container body (1), a front container cover (2) and a rear container cover (3); one end of the sample container body (1) is a sample placing hole (26), the other end of the sample container body (1) is a gas channel (27), the diameter of the sample placing hole (26) is larger than that of the gas channel (27), the sample placing hole (26) is communicated with the gas channel (27) and is internally provided with inner threads, the front container cover (2) comprises a front container cover body (28), a sample end (29) and a connection end (30), a channel is arranged among the front container cover body (28), the sample end (29) and the connection end (30), the sample end (29) is provided with outer threads and being used for connection with the inner threads of the sample placing hole (26), a channel is arranged in the middle of the rear container cover (3), and the sample container body (1) is respectively connected with the front container cover (2) and the rear container cover (3) in a sealing way. The device disclosed by the invention has the advantages of simple structure, easiness for operation, reliability and safety in sealing, high measuring precision and automation in measurement.
Description
Technical field
The present invention relates to a kind of measurement gas device for measuring permeability and measuring method in coal, specifically a kind of measurement mechanism and measuring method of estimating the penetration property of certain gas in the coal sample of having adsorbed another kind of gas.
Background technology
CO2 is injected can not working seam, strengthens coal bed methane (CH4) exploitation (CO2-ECBM) scheme simultaneously, obtains cleaning low-carbon (LC) fuel C H4 when being intended to control greenhouse gas emission, is to be expected to one of important channel of realizing the industrialization GHG emissions mitigation.The coal seam has crack and matrix of coal structure usually, and the crack is the main thoroughfare of fluid migration, and the matrix of coal of porous is the main place of CH4 with the ADSORPTION STATE storage.After CO2 injected the coal seam, infiltration and the adsorption property of CO2 in the matrix of coal that has adsorbed CH4 determined the effect of CO2 displacement CH4, and then influenced the effect of increasing production with CH4 of sealing up for safekeeping of CO2.The temperature and pressure condition in simulation coal seam in the laboratory, the Penetration Signature of research CO2 in having adsorbed the matrix of coal appearance of CH4 can provide important evidence for the effect of prediction CO2 displacement CH4, and be that CO2-ECBM technology and theoretical developments provide basic data.
The common equipment of investigating the coal sample penetration property at present is the three-axis penetration appearance, and this equipment must radially apply certain confined pressure to coal sample, to guarantee the sealing of coal sample and equipment room.Confined pressure in radial compression coal sample, may destroy the pore texture of coal sample, so this equipment can not be measured the permeability of coal sample in the raw.In addition, the size of the available coal sample of present three-axis penetration device regulation is big (the coal sample diameter is greater than 2cm), so can not measure the Penetration Signature of undersized matrix of coal appearance.And present three-axis penetration equipment mainly concentrates on measures the permeability of single kind gas in coal sample, and seldom has equipment can measure the penetration property of certain gas in the coal sample of having adsorbed another gas.The present invention does not find report through retrieval.
Summary of the invention
The purpose of this invention is to provide measurement mechanism and measuring method that a kind of measurement gas is permeated in coal.This measurement mechanism and method both can have been measured dynamically the penetrate process (unstable state) of certain gas (A) in the coal sample of having adsorbed another gas (B), again can the steady-state permeation rate of measurement gas A in the coal sample of having adsorbed gas B.
The invention provides a kind of sampling receptacle of measuring the coal sample penetration property, it is by the sampling receptacle body, and container protecgulum and container bonnet are formed, and sampling receptacle body one end is for putting sample port; The other end is a gas passage, puts the sample port diameter greater than gas passage, puts sample port and communicates with gas passage; Putting sample port has internal thread, and the container protecgulum is by the container front cover body, and sample end and link are formed; In the middle of container front cover body, link and the sample end is passage, and the sample end has external thread, is used for and puts the sample port internal thread and be connected; In the middle of the container bonnet passage is arranged, the sampling receptacle body, container protecgulum and container bonnet are tightly connected.
Aforesaid sampling receptacle is a column type.
With the sealing of O type circle, seal through the teflon pad between sampling receptacle body and the container bonnet between sampling receptacle body and container protecgulum.
The measuring method step of gas-dynamic breakthrough curve according to the invention and steady-state permeation rate is following:
The cylindric coal sample that (1) will prepare is sealed in the sampling receptacle with the sample port of putting of cementing agent from the sampling receptacle body;
(2) sampling receptacle, container protecgulum and container bonnet are connected through screw thread and seal;
(3) container protecgulum and two-way pipeline are connected, the one tunnel connects needle valve and pressure transducer; Another road is divided into three branches again, and branch one links to each other with vacuum pump with needle valve, and branch two connects retaining valve, decompression pressure regulator valve and A gas gas cylinder; Branch three links to each other with B gas gas cylinder through needle valve, decompression pressure regulator valve; Container bonnet and two-way pipeline connect, and lead up to retaining valve, needle valve to link to each other with branch three circuits, between the retaining valve and needle valve of link position in branch's three circuits; Another road connects T-valve through behind the needle valve; T-valve one branch links to each other with soap bubble flowmeter, and another branch links to each other with mass flowmeter, T-valve and detecting device, and T-valve links to each other with soap bubble flowmeter in another branch;
(3) sampling receptacle is put into calibration cell, add heating medium, and configure probe temperature, heating medium is heated to probe temperature through thermal resistance;
(4) sampling receptacle and connecting line system thereof are vacuumized;
(5) be adjusted to setting pressure from gas gas cylinder effluent air B through the decompression pressure regulator valve, lead to sampling receptacle through needle valve then, measure the flow of the B gas that penetrates coal sample with soap bubble flowmeter;
(6) treat stability of flow through sampling receptacle gas B after; Stop to feed gas B; Continue to feed the B gas of constant pressure through B gas gas cylinder, decompression pressure regulator valve, needle valve, retaining valve to the container bonnet, and make the B gas that feeds through needle valve, T-valve and mass flowmeter flow out; The flow of B gas is controlled to be definite value through mass flowmeter, and this definite value is demarcated with soap bubble flowmeter;
(7) open the detecting device power supply;
(8) the A gas that flows out from A gas gas cylinder is adjusted to setting pressure through the decompression pressure regulator valve; Lead to sampling receptacle through retaining valve then; The A gas that penetrates coal sample is continued the B gas purging that flows and is brought into detecting device; Continue detected signal in the record detecting device, then obtained the dynamic breakthrough curve of A gas in the coal column that has adsorbed B gas;
(9) after signal to be write down tended towards stability, the infiltration of A gas in coal column reached stable state basically;
The steady-state permeation rate of A gas in coal column calculated with Darcy's law, and formula is following:
In the formula:
The permeability of k---gas, m2,1mDarcy=9.87 * 10-10m2;
η---gas viscosity, Pas;
Q---the total volume flow rate of container bonnet gas, m
3/ s;
P1---container protecgulum gaseous tension, Pa;
P2---container bonnet gaseous tension, Pa;
The thickness of L---coal column, m;
The cross-sectional area of A---coal column, m2;
X---the concentration of container bonnet A gas;
(10) pressure of change A gas, repetitive operation 5-11 time can obtain the Changing Pattern of permeability along with pressure.
Described calibration cell is made up of thermostatic box, thermostatic box loam cake and thermal resistance, and thermostatic box and thermostatic box loam cake are to flexibly connect, and thermal resistance is positioned at thermostatic box.
Said thermal resistance is a type commonly used in this area, like the Pt100 RTD.
Described detecting device is connected with computing machine through lead.
Cementing agent described in the present invention is the cementing agent of can bond simultaneously coal sample and stainless steel sampling receptacle, for example polyurethanes, esters of acrylic acid or epoxy resin cementing agent.
Any range that the top hole pressure of the decompression pressure regulator valve described in the present invention can bear pressure for fixing cementing agent.
The flow range of the mass flowmeter described in the present invention depends on size, permeability and the gas property of coal sample.
The maximal value that pressure transducer range described in the present invention can bear pressure for fixing cementing agent, measuring accuracy is 0.05%FS.
Vacuum pump described in the present invention can make the absolute pressure of reactive system reduce to 0-0.02MPa.
The heating medium of calibration cell described in the present invention is this area various heating mediums commonly used, and like water or various suitable heat-conducting liquid, the operating temperature range of this calibration cell is shown selected heating medium and decide that temperature-controlled precision is ± 0.1 ℃.
Detecting device described in the present invention is can the detected gas variable signal or any detecting device of concentration, for example thermal conductivity detector (TCD) and mass spectrum etc.
The advantage of the device for measuring permeability of a kind of coal provided by the invention and measuring method apparatus of the present invention and method is following:
1, this device can be measured coal sample and be in the permeability that is close under the state of nature through cementing agent sealing coal sample.
2, this equipment can adopt the small scale coal sample, to guarantee that the coal sample of being surveyed is the matrix of coal part.
3, this device is employed in line detector, both can measure dynamically the penetrate process of certain gas in the coal sample of having adsorbed another kind of gas, can measure the steady-state permeation rate of certain gas in the coal sample of having adsorbed another gas again; And utilize computer-automatic collection to come the signal data of self-detector, and the data that collect to be handled calculating and preservation, and on computer screen, show time dependent detection signal in the experimentation in real time, the realization intellectuality is controlled and measurement automatically.
4, have simple in structure, easy operating, advantages such as sealing is reliable and secure, measuring accuracy is high, automatic measurement.
Description of drawings
Accompanying drawing 2 is the structural representation of the sampling receptacle of permeability apparatus
The dynamic breakthrough curve of gas A when accompanying drawing 3 is 1.5MPa for pressure in the coal column that has adsorbed gas B.
Accompanying drawing 4 is the change curve of the steady-state permeation rate of gas A in the coal sample of having adsorbed gas B along with pressure.
As shown in the figure: 1-sampling receptacle body; 2-container protecgulum; 3-container bonnet; The 4-cementing agent; The 5-coal sample; 6-CH4 gas gas cylinder; The 7-pressure regulator valve that reduces pressure; The 8-needle valve; 9-CO2 gas gas cylinder; The 10-pressure regulator valve that reduces pressure; The 11-retaining valve; The 12-needle valve; The 13-vacuum pump; The 14-needle valve; The 15-pressure transducer; The 16-needle valve; The 17-retaining valve; The 18-needle valve; The 19-T-valve; The 20-soap bubble flowmeter; The 21-mass flowmeter; The 22-T-valve; The 23-detecting device; The 24-thermostatic box; 25-thermostatic box loam cake; 26-is put sample port; The 27-gas passage; 28-container front cover body; 29-sample end; The 30-link; 31-O type circle; 32-teflon pad; The 33-thermal resistance; The 34-pressure transducer.
Embodiment
Do further below in conjunction with the embodiment specific embodiments of the invention and to be described in detail.
Calibration cell is made up of thermostatic box 24, thermostatic box loam cake 25 and thermal resistance 33, and thermostatic box 24 is to flexibly connect with thermostatic box loam cake 25, and thermal resistance 33 is positioned at thermostatic box 24.
Coal sample is made into diameter 6mm, and the cylindrical shape about high 13mm is sealed in the coal column sample 5 for preparing in the sampling receptacle body 1 with cementing agent 4.2 of sampling receptacle body 1 and container protecgulums be with O type circle sealing 31, between sampling receptacle body 1 and the container bonnet 2 through the sealing 32 of teflon pad through being threaded.Container protecgulum 1 is connected with the two-way pipeline, and one the tunnel is connected with needle valve 14 and pressure transducer 15; Another road is divided into three branches again, and branch one links to each other with vacuum pump 13 with needle valve 12, and branch two is connected with retaining valve 11, decompression pressure regulator valve 10 and CO2 gas cylinder 9, and branch three links to each other with CH4 gas cylinder 6 behind needle valve 8 and the pressure regulator valve 7 that reduces pressure.CH4 gas cylinder 6, decompression pressure regulator valve 7, needle valve 16, retaining valve 17 connect to form kind admission line of container bonnet 3 through pipeline; Container bonnet 3 give vent to anger pipeline behind needle valve 18; Be divided into two-way through T-valve 19; One the tunnel links to each other with soap bubble flowmeter 20, and another road links to each other with mass flowmeter 21, T-valve 22 and thermal conductance (TCD) detecting device 23.The whole sample container is placed in the thermostatic box 24, and thermostatic box 24 adds heating medium water.
(1) open the power supply of calibration cell, the temperature of setting calibration cell is heated to 45 ℃ of probe temperatures to the temperature (45 ℃) that needs through 33 pairs of heating medium water of thermal resistance.
(2) close needle valve 8,14 and 18, open needle valve 12,13 pairs of systems vacuumize 20min with vacuum pump.
(3) close needle valve 12 and 16, open needle valve 8,14 and 18, and connect needle valve 18 and soap bubble flowmeter 20, through T-valve 22 quality of connection flowmeters 21 and thermal conductance (TCD) detecting device 23 through T-valve 19.The setting pressure of setting decompression pressure regulator valve 7 is 1.0MPa; Continuing to feed pressure to sampling receptacle is the CH4 gas of 1.0MPa; And measure the CH4 gas flow that penetrates sample cell with soap bubble flowmeter 20, till the CH4 of appearance soap bubble flowmeter 20 gas flow is stable.
(4) valve-off 8, open valve 16, connect needle valve 18 and mass flowmeter 21 through T-valve 19, through T-valve 22 quality of connection flowmeters 21 and soap bubble flowmeter 20.Continuing to feed pressure P 2 to container bonnet 3 places of sample cell through decompression pressure regulator valve 7, needle valve 16 and retaining valve 17 through CH4 gas cylinder 6 is the CH4 gas of 1MPa; The flow of CH4 gas is controlled to be definite value through mass flowmeter 21; This definite value can use soap bubble flowmeter 20 to demarcate, and flow velocity is 30ml/min.
(5) open the power supply of thermal conductance (TCD) detecting device 23, start computing machine and also move testing software;
(6) through T-valve 22 quality of connection flowmeters 21 and detecting device 23; The pressure of setting decompression pressure regulator valve 10 adjusting container protecgulum gaseous tension P1 is 1.5MPa; CO2 gas leads to container protecgulum 2 by CO2 gas cylinder 9 through decompression pressure regulator valve 10, retaining valve 11, after CO2 penetrates coal column, is continued the CH4 gas purging that flows and brings thermal conductance (TCD) detecting device 23 into; Detecting device 23 continue record signal indications the process that dynamically penetrates of CO2, the result is as shown in Figure 3.
(7) after the signal of device 23 records to be detected tends towards stability (Fig. 3), the concentration of CO2 gas is 0.03, and the infiltration of CO2 in coal column reaches stable state basically.Calculate the steady-state permeation rate of CO2 gas in the coal column that has adsorbed CH4 according to formula 1.CO2 is 0.0000161Pas 45 ℃ viscosities il value; The cross-sectional area A of coal column is 0.00002826m2; The thickness L of coal column is 0.013m; Container protecgulum gaseous tension P1 value is 1500000Pa, and container bonnet gaseous tension P2 value is 1000000Pa, and the total volume flow rate of container bonnet gas is 0.0000005m
3/ s, the concentration value of CO2 gas are 0.03, and the infiltration of CO2 in coal column can calculate and be 1.78mDarcy.
(8) change CO2 pressure, repetitive operation 2-7 can obtain the Changing Pattern of steady-state permeation rate along with pressure, and is as shown in Figure 4.
Claims (10)
1. the measuring method of the measurement mechanism that in coal, permeates of a measurement gas is characterized in that comprising the steps:
The cylindric coal sample that (1) will prepare is sealed in the sampling receptacle with the sample port (26) of putting of cementing agent from sampling receptacle body (1);
(2) sampling receptacle body (1), container protecgulum (2) and container bonnet (3) are connected through screw thread and seal;
(3) container protecgulum (2) and two-way pipeline are connected, the one tunnel connects needle valve one (14) and pressure transducer one (15); Another road is divided into three branches again; Branch one links to each other with vacuum pump (13) with needle valve two (12); Branch two connects retaining valve one (11), decompression pressure regulator valve one (10) and A gas gas cylinder (9), and branch three links to each other the container bonnet through needle valve three (8), decompression pressure regulator valve two (7) with B gas gas cylinder (6)
(3) connect with other two-way pipeline; Leading up to retaining valve two (17), needle valve four (16) links to each other with said branch three circuits; Link position is arranged between the needle valve three (8) and decompression pressure regulator valve two (7) of said branch three circuits; Another road connects pressure transducer two (34) and T-valve one (19) through needle valve five (18) backs; Pressure transducer two (34) link positions are positioned between needle valve five (18) and the T-valve one (19); One branch of T-valve one (19) links to each other with soap bubble flowmeter (20), and another branch of T-valve one (19) links to each other with mass flowmeter (21), T-valve two (22) and detecting device (23), and T-valve two (22) links to each other with soap bubble flowmeter (20) in another branch of said T-valve one (19);
(4) sampling receptacle is put into calibration cell (24), add heating medium, and configure probe temperature, heating medium is heated to probe temperature through thermal resistance (33);
(5) sampling receptacle and connecting line system thereof are vacuumized;
(6) be adjusted to setting pressure from B gas gas cylinder (6) effluent air B through decompression pressure regulator valve two (7), lead to sampling receptacle through needle valve three (8) then, measure the flow of the B gas that penetrates coal sample with soap bubble flowmeter (20);
(7) treat stability of flow through sampling receptacle gas B after; Stop to feed gas B; Continue to feed the B gas of constant pressure through B gas gas cylinder (6), decompression pressure regulator valve two (7), needle valve four (16), retaining valve two (17) to container bonnet (3), and make the B gas that feeds through needle valve five (18), T-valve one (19) and mass flowmeter (21) flow out; The flow of B gas is controlled to be definite value through mass flowmeter (21), and this definite value is demarcated with soap bubble flowmeter (20);
(8) open the detecting device power supply;
(9) the A gas that flows out from A gas gas cylinder (9) is adjusted to setting pressure through decompression pressure regulator valve one (10); Lead to sampling receptacle through retaining valve one (11) then; The A gas that penetrates coal sample is continued the B gas purging that flows and is brought into detecting device (23); Continue detected signal in the record detecting device, then obtained the dynamic breakthrough curve of A gas in the coal column that has adsorbed B gas;
(10) after signal to be write down tended towards stability, the infiltration of A gas in coal column reached stable state basically;
The steady-state permeation rate of A gas in coal column calculated with Darcy's law, and formula is following:
In the formula:
The permeability of k---gas, m
2, 1mDarcy=9.87 * 10-10m
2
η---gas viscosity, Pas;
Q---the total volume flow rate of container bonnet gas, m
3/ s;
P
1---container protecgulum gaseous tension, Pa;
P
2---container bonnet gaseous tension, Pa;
The thickness of L---coal column, m;
The cross-sectional area of A---coal column, m
2
X---the concentration of container bonnet A gas;
(11) pressure of change A gas, repetitive operation 5-11 time can obtain the Changing Pattern of permeability along with pressure;
It is by sampling receptacle body (1) for described sampling receptacle, and container protecgulum (2) and container bonnet (3) are formed, and it is characterized in that sampling receptacle body (1) one end is for putting sample port (26); The other end is gas passage (27), puts sample port (26) diameter greater than gas passage (27), puts sample port (26) and communicates with gas passage (27); Put sample port (26) internal thread is arranged; Container protecgulum (2) is by container front cover body (28), and sample end (29) and link (30) are formed, and is passage in the middle of container front cover body (28), sample end (29) and the link (30); Sample end (29) has external thread; Be used for and put sample port (26) internal thread and be connected, passage is arranged in the middle of the container bonnet (3), sampling receptacle body (1) is tightly connected respectively with container protecgulum (2) and container bonnet (3);
Described calibration cell is made up of thermostatic box (24), thermostatic box loam cake (25) and thermal resistance (33), and thermostatic box (24) is to flexibly connect with thermostatic box loam cake (25), and thermal resistance (33) is positioned at thermostatic box.
2. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that described sampling receptacle body (1), and container protecgulum (2) and container bonnet (3) are column type.
3. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal; It is characterized in that sealing with O type circle between described sampling receptacle body (1) and container protecgulum (2), seal through the teflon pad between sampling receptacle body (1) and the container bonnet (3).
4. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that described thermal resistance (33) is the Pt100 RTD.
5. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that described cementing agent is polyurethanes, esters of acrylic acid or epoxy resin cementing agent.
6. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that the measuring accuracy of described pressure transducer one (15) and pressure transducer two (34) is 0.05%FS.
7. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that described vacuum pump (13) makes the absolute pressure of reactive system reduce to 0-0.02MPa.
8. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal, the heating medium that it is characterized in that described calibration cell is a water.
9. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that the temperature temperature-controlled precision of described calibration cell is ± 0.1 ℃.
10. the measuring method of the measurement mechanism that a kind of measurement gas as claimed in claim 1 is permeated in coal is characterized in that described detecting device (23) is thermal conductivity detector (TCD) or mass spectrum.
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| CN2011100320059A CN102147348B (en) | 2011-01-25 | 2011-01-25 | Device and method for measuring gas permeation in coal |
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| CN103245588B (en) * | 2013-05-17 | 2015-01-21 | 国家地质实验测试中心 | Gas content measurement and gas collection device |
| CN103257101B (en) * | 2013-05-24 | 2014-11-12 | 中国石油大学(北京) | Coating-containing core as well as core holder anti-corrosion method and core displacement experiment method |
| CN103616317B (en) * | 2013-12-16 | 2016-03-30 | 南京工业大学 | A kind of fully-automatic equipment of assaying reaction heap material helium diffuse coefficient and method |
| CN104964905A (en) * | 2015-07-07 | 2015-10-07 | 中国矿业大学 | Tectonic coal permeability tester |
| CN105527209B (en) * | 2015-12-07 | 2018-04-20 | 河海大学 | A kind of constant pressure type field soil ventilative speed analyzer |
| CN106124380B (en) * | 2016-06-22 | 2019-01-15 | 太原理工大学 | The device and method of coal column gas permeability is measured in a kind of similarity simulation experiment |
| CN107976395A (en) * | 2017-12-21 | 2018-05-01 | 西安科技大学 | CO in loose coal2Osmosis system measurement device and its method |
| CN109991144A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Epoxy sealing type measuring device for gas permeability |
| CN109630100B (en) * | 2018-10-31 | 2021-09-24 | 中国矿业大学 | Automatic coal seam permeability testing device and method |
| CN109655391B (en) * | 2018-11-19 | 2022-01-11 | 中国矿业大学 | Rock-soil body material gas breakthrough/permeability characteristic double-module control test system |
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|---|---|---|---|---|
| CN2788175Y (en) * | 2005-04-22 | 2006-06-14 | 辽宁工程技术大学 | Auto pressure type tri-axial permeameter |
| CN1815175A (en) * | 2006-02-07 | 2006-08-09 | 同济大学 | Detecting instrument for concrete gas seepage coefficient under single-shaft-pressure stress and detecting method |
| CN202075200U (en) * | 2011-01-25 | 2011-12-14 | 中国科学院山西煤炭化学研究所 | Device for testing permeation of gas in coal |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2788175Y (en) * | 2005-04-22 | 2006-06-14 | 辽宁工程技术大学 | Auto pressure type tri-axial permeameter |
| CN1815175A (en) * | 2006-02-07 | 2006-08-09 | 同济大学 | Detecting instrument for concrete gas seepage coefficient under single-shaft-pressure stress and detecting method |
| CN202075200U (en) * | 2011-01-25 | 2011-12-14 | 中国科学院山西煤炭化学研究所 | Device for testing permeation of gas in coal |
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