CN102901803A - Water-gas two-phase adsorption-desorption-seepage experimental system and method for loaded coal containing methane - Google Patents
Water-gas two-phase adsorption-desorption-seepage experimental system and method for loaded coal containing methane Download PDFInfo
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Abstract
The invention discloses a water-gas two-phase adsorption-desorption-seepage experimental system and method for loaded coal containing methane. The water-gas two-phase adsorption-desorption-seepage experimental system for loaded coal containing methane comprises a pressure loading part, wherein the pressure loading part comprises a tank body for containing a constant-temperature water bath, a reference pot and a coal sample holder are arranged in the tank body, the gas inlet of the reference pot is connected with a high-pressure methane delivery pipeline, the gas outlet of the reference pot is connected with the gas inlet of the coal sample holder through a connecting pipeline, and the gas outlet of the coal sample holder is connected with a water-gas separation device. The water-gas two-phase seepage experimental method for loaded coal containing methane is carried out on the basis of the experimental system. By changing different loading conditions, loading paths and experimental temperatures, adsorption-desorption experiments and methane seepage experiments for the loaded coal containing methane under the conditions of different solid-gas thermal coupling can be realized, and water-gas two-phase seepage experiments and methane adsorption-desorption experiments under the condition of different moisture contents also can be realized.
Description
Technical field
The present invention relates to a kind ofly for the coal containing methane gas absorption-desorption under different loads, different temperatures, different water cut and the aqueous vapor two-phase medium condition-Seepage Experiment investigative technique, is a kind of stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system and method.
Background technology
Absorption-desorption-the seepage characteristic of methane gas is subjected to the impact of the factors such as gas pressure, terrestrial stress, underground water, ground temperature, Coal Pore Structure, stress in the coal seam, especially along with China's coal-mine enters deep mining day by day, this multifactor coupled relation shows more obviously.Absorption-desorption experimental system in the past and seepage flow experiment system basically divide and come, and consider to such an extent that be not very comprehensive to influence factor.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing experimental technique, a kind of stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system and method is provided, by changing different loading environments, load path and experimental temperature, can realize adsorption and desorption experiment and the gas Seepage Experiment of stand under load coal containing methane gas under different solid and gas thermal coupling conditions, also can realize the Seepage Experiment of aqueous vapor two-phase and the system and method for the gas adsorption desorption experiment under the different water cut condition.
For achieving the above object, the present invention adopts following technical scheme: a kind of stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, comprise the pressure-loaded part, pressure-loaded partly comprises the pond body for the splendid attire water bath with thermostatic control, establish in the body of pond with reference to tank and coal sample clamper, connect the high pressure gas transfer pipeline with reference to the air intake opening of tank, connect the air intake opening of coal sample clamper with reference to the gas outlet of tank by connecting line, the gas outlet of coal sample clamper connects moisture separator.
Stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system also comprises the coal sample producing device, and the coal sample producing device comprises that the top is provided with the coal sample tank of bleeding point, and the bleeding point of coal sample tank connects vacuum-pumping pipeline.
Described moisture separator is moisture separator, and the gas outlet of moisture separator connects the gas measuring apparatus, and the leakage fluid dram of moisture separator connects liquid metering device.
Be provided with successively high pressure gas tank, the first reduction valve, the first tensimeter and switch valve on the described high pressure gas transfer pipeline; With reference to also being provided with successively the second tensimeter, switch valve, the second reduction valve, the 3rd tensimeter and switch valve on the gas outlet of tank and the connecting line between the coal sample clamper air intake opening.
Adopt above-mentioned experimental system to carry out the method for stand under load coal containing methane gas aqueous vapor two phase fluid flow experiment, comprise the steps: that (one) prepares first stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, (2) get an initial coal sample, initial coal sample is put into the coal sample tank, pack in the coal sample tank and do not have at least the water of initial coal sample, the water surface is lower than bleeding point, then by vacuum-pumping pipeline the coal sample tank is vacuumized, initial coal sample is made the moisture coal sample that contains saturation water, (3) from the coal sample tank, take out moisture coal sample and the coal sample clamper of packing into, methane gas by high pressure gas transfer pipeline input certain pressure in the reference tank, to be full of water bath with thermostatic control in the body of pond, place together the water bath with thermostatic control that arranges in the body of pond with reference to tank and coal sample clamper, make with reference to the methane gas temperature in the tank and moisture coal sample temperature and all reach experimental temperature, (4) by the coal sample clamper moisture coal sample is loaded confined pressure and/or axial compression and voltage stabilizing, (5) be filled with the methane gas of certain pressure size to moisture coal sample inside by connecting line with reference to tank, begin to carry out coal containing methane gas aqueous vapor two phase fluid flow process, (6) from moisture coal sample inside out water and methane gas by behind the moisture separator, respectively by gas measuring apparatus and liquid metering device metering gas flow and discharge.
Before moisture coal sample is packed the coal sample clamper into, calculate first the factor of porosity of moisture coal sample.
Adopt above-mentioned experimental system to carry out the method for stand under load coal containing methane gas different water cut absorption-desorption experiment, it is characterized in that: comprise the steps: that (one) prepares first stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, (2) get an initial coal sample, get an initial coal sample, initial coal sample is put into the coal sample tank, pack in the coal sample tank and do not have at least the water of initial coal sample, the water surface is lower than bleeding point, then by vacuum-pumping pipeline the coal sample tank is vacuumized, initial coal sample is made the moisture coal sample that contains saturation water, (3) moisture coal sample is packed into coal sample clamper and moisture coal sample applied a certain size confined pressure, recycling is removed moisture in the moisture coal sample of displacement with reference to the methane gas in the tank by connecting line, then lay down confined pressure, from the coal sample clamper, take out moisture coal sample, and calculate the water percentage of moisture coal sample, the coal sample clamper of again moisture coal sample being packed into, methane gas by high pressure gas transfer pipeline input certain pressure in the reference tank, to be full of water bath with thermostatic control in the body of pond, place together the water bath with thermostatic control that arranges in the body of pond with reference to tank and coal sample clamper like this, make with reference to the methane gas temperature in the tank and moisture coal sample temperature and all reach experimental temperature, (4) by the coal sample clamper moisture coal sample is loaded confined pressure and/or axial compression and voltage stabilizing, (5) in moisture coal sample, be filled with methane gas by connecting line with reference to tank, the adsorption process of beginning stand under load coal containing methane gas, moisture coal sample adsorption gas is not less than 12 hours, (6) treat after the coal sample adsorption equilibrium, pass through moisture separator from moisture coal sample inside gas and distilled water out, begin to carry out the parsing experimentation of stand under load coal containing methane gas, the desorption of mash gas amount is measured by recorder jar.
Stand under load coal containing methane gas aqueous vapor two-phase absorption-desorption-seepage flow experiment system of the present invention and method, both considered the adsorption-desorption effect of methane gas, considered again the flow event of gas, can consider simultaneously the combined influence under the conditions such as different temperatures, different stress, different loading paths, single-phase medium, aqueous vapor two-phase medium and different water cut, process the empirical curve that can obtain under the various combination experiment conditions by data.And, can provide invariable experimental temperature environment by water bath with thermostatic control with reference to tank; By adding distilled water, can realize aqueous vapor two-phase absorption-desorption-Seepage Experiment, also can realize the absorption-desorption experiment under the different water cut condition, increased the experiential function of system; Pass through axial loading device, realized coal sample is applied axial load, along with the increase of axle pressure, can be used for investigating the micro-crack extension and the impact that destroys gas adsorption-desorption properties of coal sample inside, this is the experiential function that other most experiments systems and equipment can't possess; Measuring apparatus can accurately detect and measure various experiment parameter sizes, to guarantee the reliability of raw data.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of coal sample producing device.
Embodiment
Embodiment 1:
By stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption illustrated in figures 1 and 2-desorption and seepage experimental system, comprise pressure-loaded part and coal sample producing device.
Pressure-loaded partly comprises the pond body 4 for splendid attire water bath with thermostatic control 4A, establish in the pond body 4 with reference to tank 5 and coal sample clamper 6, be airtight setting and be provided with air intake opening and the gas outlet with reference to tank 5, air intake opening with reference to tank 5 connects high pressure gas transfer pipeline 7, be provided with successively high pressure gas tank 1 on the high pressure gas transfer pipeline 7, the first reduction valve 2, the first tensimeter 14 and switch valve 20, the high pressure gas gas of high pressure gas tank 1 can be inputted with reference in the tank 5, and respectively by the first reduction valve 2, the first tensimeter 14 and switch valve 20 are realized 7 decompressions of high pressure gas transfer pipeline, pressure measurement and switch, wherein the exit of high pressure gas tank 1 also carries switch valve 19; The air intake opening that connects coal sample clamper 6 with reference to the gas outlet of tank 5 by connecting line 8, be provided with successively the second tensimeter 15 on from reference tank 5 to the connecting line 8 between the coal sample clamper 6, switch valve 21, the second reduction valve 3, the 3rd tensimeter 16 and switch valve 22, the second tensimeter 15, the 3rd tensimeter 16 is in order to measure from the gas pressure value of reference tank 5 methane gas step-down front and back out, switch valve 21,22 switches in order to the whole connecting line 8 of switch, the gas outlet of coal sample clamper 6 connects moisture separator by pipeline 11, and pipeline 11 is provided with switch valve 25 with the switch of control pipeline 11.Moisture separator is moisture separator 9, the gas outlet 18 of moisture separator 9 connects the gas measuring apparatus by the first connecting pipe 23, the gas measuring apparatus is soap-foam flowmeter 10, the leakage fluid dram 17 of moisture separator 9 connects liquid metering device by the second connecting pipe 24, liquid metering device is recorder jar 12, the top mouth of recorder jar 12 connects the second connecting pipe 24, and the end mouth of recorder jar 12 is by pipe access liquid collecting cup 13.But wherein 6 clampings of coal sample clamper, fixing seal coal sample and connect the confined pressure volume pump or the axial compression volume pump, can implement confined pressure or axial compression to coal sample, also can be described as coal seam core holding unit, triaxial stress cinder heart clamp holder or directly use the patent No. to be ZL201020128142.3, name is called " multi-functional true triaxial stress cinder heart clamp holder " and also can, be prior art, so be not described in detail herein.
The coal sample producing device comprises that the top is provided with the coal sample tank 26 of bleeding point 32, coal sample tank 26 is made of tank body and the gland bonnet that is sealed in tank body top mouth, coal sample tank 26 materials are organic glass, bleeding point 32 is arranged at the top of gland bonnet, the bleeding point 32 of coal sample tank 26 connects vacuum-pumping pipeline 33, and vacuum-pumping pipeline 33 is provided with vacuum pump 31, switch valve 30 and buffer container 29 successively, and vacuum pump 31 is used for vacuumizing, switch valve 30 is with the switch of control vacuum-pumping pipeline 33, and buffer container 29 plays the buffer memory effect.
With coal sample tank 26 built-in coal sample and distilled water, the coal sample producing device can vacuumize saturation water to coal sample, namely is used for coal sample is vacuumized and saturated distilled water, makes in the coal sample not only adsorption moisture but also exists without gas; Moisture separator is used for coal sample distilled water out from coal sample clamper 6 is separated with methane gas; Pond body 4 be used for splendid attire water bath with thermostatic control 4A and with other supporting temperature control configuration of instrument attemperating units, for experiment provides the stationary temperature environment, guarantee the accuracy of experimental data.
Stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption of the present invention-desorption and seepage experimental system, can be by gas pressure size, the experimental datas such as confined pressure is big or small, axial compression is big or small, temperature level, discharge size, methane gas uninterrupted in the metering experimentation, significant data in record and the monitoring experiment process is for experimental analysis provides accurately real raw data.
Experimental system provided by the invention can be achieved as follows main experiential function:
(1) stand under load coal containing methane gas absorption-desorption experiment;
(2) stand under load coal containing methane gas absorption-desorption-Seepage Experiment;
(3) stand under load coal containing methane gas aqueous vapor two phase fluid flow experiment;
(4) absorption-desorption of different water cut stand under load coal containing methane gas experiment.
Embodiment 2:
Stand under load coal containing methane gas aqueous vapor two phase fluid flow experimental technique by illustrated in figures 1 and 2 comprises the steps:
(1) prepares first as described in Example 1 stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, connect all pipelines and close all switch valves.
(2) get an initial coal sample, the coal sample size places on the precise electronic balance and weighs about Φ 50 * 100mm, and the initial weight of counting initial coal sample is m
0Initial coal sample is put into coal sample tank 26, pack in the coal sample tank 26 and do not have at least the distilled water 28 of initial coal sample end face, distilled water 28 waters surface are lower than bleeding point 32, then the bleeding point 32 that vacuum-pumping pipeline 33 is connected coal sample tank 26, after checking the impermeability of coal sample tank 26 and vacuum-pumping pipeline 33, vacuumize by 33 pairs of coal sample tanks 26 of vacuum-pumping pipeline, vacuumize the saturation water process and this process is continued three hours, initial coal sample is made the moisture coal sample 27 that contains saturation water but do not contain gas, after vacuumizing the saturation water process and finishing, the distilled water in the coal sample tank 26 is poured out, careful take out moisture coal sample 27, and moisture coal sample 27 weighed count m
1, then calculate the volume of voids of moisture coal sample 27 according to following formula:
In the formula: v
sVolume of voids for moisture coal sample 27; ρ
wDensity for distilled water.
After knowing the volume of voids of moisture coal sample 27, the factor of porosity of moisture coal sample 27 calculates with following formula.
In the formula:
vCumulative volume for moisture coal sample 27.
(3) from coal sample tank 26, take out moisture coal sample 27 and the coal sample clamper 6 of packing into, open switch valve 19,20, by the methane gas of high pressure gas transfer pipeline 7 from high pressure gas tank 1 to reference tank 5 interior input certain pressures, the gas pressure size is adjusted by the first reduction valve 2, water bath with thermostatic control 4A will be full of in the pond body 4, place together the water bath with thermostatic control 4A of pond body 4 interior settings with reference to tank 5 and coal sample clamper 6, make with reference to methane gas temperature and moisture coal sample 27 temperature in the tank 5 all to reach the experimental temperature that water bath with thermostatic control sets.
(4) closing switch valve 19,20 loads a certain size confined pressure and voltage stabilizing by the moisture coal samples 27 of 6 pairs of coal sample clampers, behind confined pressure steady, more moisture coal sample 27 is loaded a certain size axial compression and voltage stabilizing.Certainly, the present invention is not limited to above-mentioned form, also can apply separately confined pressure or axial compression according to experiment method and purpose, and the size of pressure all can be set and shown by coal sample clamper 6, and confined pressure, axial compression to apply sequencing fixed according to situation.
(5) behind the Axial Compression Stability of moisture coal sample 27, open switch valve 21,22,25, be filled with the methane gas of certain pressure size to moisture coal sample 27 inside by connecting line 8 with reference to tank 5, begin to carry out coal containing methane gas aqueous vapor two phase fluid flow process, the large I of gas pressure is adjusted by the second reduction valve 3.
(6) from moisture coal sample 27 inside out distilled water and methane gas by behind the moisture separator 9, recorder jar 12 metering gas flow and the discharges of soap-foam flowmeter 10 and the liquid metering device by the gas measuring apparatus respectively.
(7) after the aqueous vapor two phase fluid flow under a kind of experiment condition finishes, can change experiment condition by changing experimental temperature, confined pressure, axial compression and gas pressure size, thereby can draw aqueous vapor two phase fluid flow characteristic and the rule thereof of stand under load coal containing methane gas under various different experimental conditions.
Embodiment 3:
By stand under load coal containing methane gas different water cut absorption-desorption experimental technique illustrated in figures 1 and 2, comprise the steps: that (one) prepares first as described in Example 1 stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, connects all pipelines and closes all switch valves.
(2) place on the precise electronic balance and weigh, the initial weight of counting initial coal sample is m
0Initial coal sample is put into coal sample tank 26, pack in the coal sample tank 26 and do not have at least the distilled water 28 of initial coal sample end face, distilled water 28 waters surface are lower than bleeding point 32, then the bleeding point 32 that vacuum-pumping pipeline 33 is connected coal sample tank 26, after checking the impermeability of coal sample tank 26 and vacuum-pumping pipeline 33, vacuumize by 33 pairs of coal sample tanks 26 of vacuum-pumping pipeline, vacuumize the saturation water process and this process is continued three hours, initial coal sample is made the moisture coal sample 27 that contains saturation water but do not contain gas, after vacuumizing the saturation water process and finishing, the distilled water in the coal sample tank 26 is poured out, carefully taken out moisture coal sample 27.Moisture coal sample 27 can be made into the different polylith of water percentage.
(3) moisture coal sample 27 is packed into coal sample clamper 6 and moisture coal sample 27 applied a certain size confined pressure, recycling is removed moisture in the moisture coal sample 27 of displacement with reference to the methane gas in the tank 5 by connecting line 8, then lay down confined pressure, from coal sample clamper 6, take out moisture coal sample 27 and the m that weighs
1,The water percentage of moisture coal sample 27 just can calculate by following formula:
The water percentage size can be determined by the water yield of displacement.
The coal sample clamper 6 of more moisture coal sample 27 being packed into, open switch valve 19,20, by the methane gas of high pressure gas transfer pipeline 7 from high pressure gas tank 1 to reference tank 5 interior input certain pressures, the gas pressure size is adjusted by the first reduction valve 2, water bath with thermostatic control 4A will be full of in the pond body 4, make with reference to tank 5 and coal sample clamper 6 and place together the water bath with thermostatic control 4A of pond body 4 interior settings, make with reference to the methane gas temperature in the tank 5 and moisture coal sample 27 temperature all to reach experimental temperature.
(4) closing switch valve 19,20 loads a certain size confined pressure and voltage stabilizing by the moisture coal samples 27 of 6 pairs of coal sample clampers, behind confined pressure steady, more moisture coal sample 27 is loaded a certain size axial compression and voltage stabilizing.Certainly, the present invention is not limited to above-mentioned form, also can apply separately confined pressure or axial compression according to experiment method and purpose, and the size of pressure all can be set and shown by coal sample clamper 6, and confined pressure, axial compression to apply sequencing fixed according to situation.
(5) behind the Axial Compression Stability of moisture coal sample 27, open switch valve 21,22, utilization is filled with the methane gas of certain pressure size to moisture coal sample 27 inside by connecting line 8 with reference to tank 5, the adsorption process of beginning stand under load coal containing methane gas, moisture coal sample 27 adsorption gas are not less than 12 hours, adsorbance calculates by the gas pressure reduction value of reference tank 5, and namely the difference of the second tensimeter 15 and the 3rd tensimeter 16 obtains.
(6) treat after the coal sample adsorption equilibrium, closing switch valve 22 is opened switch valve 25, from moisture coal sample 27 inside out gas and distilled water by moisture separator 9, begin to carry out the parsing experimentation of stand under load coal containing methane gas, the desorption of mash gas amount is measured by recorder jar 12.
(7) after a kind of adsorption and desorption experiment of stand under load coal containing methane gas of water percentage is finished, can change experiment condition by the size that changes experimental temperature, confined pressure, axial compression and gas pressure, thereby can draw adsorption-desorption characteristics and the rule thereof of different water cut stand under load coal containing methane gas under various different experimental conditions.
Claims (7)
1. stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, it is characterized in that: comprise the pressure-loaded part, pressure-loaded partly comprises the pond body for the splendid attire water bath with thermostatic control, establish in the body of pond with reference to tank and coal sample clamper, air intake opening with reference to tank connects the high pressure gas transfer pipeline, connect the air intake opening of coal sample clamper with reference to the gas outlet of tank by connecting line, the gas outlet of coal sample clamper connects moisture separator.
2. stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption as claimed in claim 1-desorption and seepage experimental system, it is characterized in that: stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system also comprises the coal sample producing device, the coal sample producing device comprises that the top is provided with the coal sample tank of bleeding point, and the bleeding point of coal sample tank connects vacuum-pumping pipeline.
3. stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption as claimed in claim 2-desorption and seepage experimental system, it is characterized in that: described moisture separator is moisture separator, the gas outlet of moisture separator connects the gas measuring apparatus, and the leakage fluid dram of moisture separator connects liquid metering device.
4. stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption as claimed in claim 3-desorption and seepage experimental system is characterized in that: be provided with successively high pressure gas tank, the first reduction valve, the first tensimeter and switch valve on the described high pressure gas transfer pipeline; With reference to also being provided with successively the second tensimeter, switch valve, the second reduction valve, the 3rd tensimeter and switch valve on the gas outlet of tank and the connecting line between the coal sample clamper air intake opening.
5. adopt the described experimental system of claim 1-4 to carry out the method for stand under load coal containing methane gas aqueous vapor two phase fluid flow experiment, it is characterized in that: comprise the steps: that (one) prepares first stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, (2) get an initial coal sample, initial coal sample is put into the coal sample tank, pack in the coal sample tank and do not have at least the water of initial coal sample, the water surface is lower than bleeding point, then by vacuum-pumping pipeline the coal sample tank is vacuumized, initial coal sample is made the moisture coal sample that contains saturation water, (3) from the coal sample tank, take out moisture coal sample and the coal sample clamper of packing into, methane gas by high pressure gas transfer pipeline input certain pressure in the reference tank, to be full of water bath with thermostatic control in the body of pond, place together the water bath with thermostatic control that arranges in the body of pond with reference to tank and coal sample clamper, make with reference to the methane gas temperature in the tank and moisture coal sample temperature and all reach experimental temperature, (4) by the coal sample clamper moisture coal sample is loaded confined pressure and/or axial compression and voltage stabilizing, (5) be filled with the methane gas of certain pressure size to moisture coal sample inside by connecting line with reference to tank, begin to carry out coal containing methane gas aqueous vapor two phase fluid flow process, (6) from moisture coal sample inside out water and methane gas by behind the moisture separator, respectively by gas measuring apparatus and liquid metering device metering gas flow and discharge.
6. the method for stand under load coal containing methane gas aqueous vapor two phase fluid flow experiment as claimed in claim 5 is characterized in that: before moisture coal sample is packed the coal sample clamper into, calculate first the factor of porosity of moisture coal sample.
7. adopt the described experimental system of claim 1-4 to carry out the method for stand under load coal containing methane gas different water cut absorption-desorption experiment, it is characterized in that: comprise the steps: that (one) prepares first stand under load coal containing methane gas aqueous vapor two-phase Temp .-changing adsorption-desorption and seepage experimental system, (2) get an initial coal sample, get an initial coal sample, initial coal sample is put into the coal sample tank, pack in the coal sample tank and do not have at least the water of initial coal sample, the water surface is lower than bleeding point, then by vacuum-pumping pipeline the coal sample tank is vacuumized, initial coal sample is made the moisture coal sample that contains saturation water, (3) moisture coal sample is packed into coal sample clamper and moisture coal sample applied a certain size confined pressure, recycling is removed moisture in the moisture coal sample of displacement with reference to the methane gas in the tank by connecting line, then lay down confined pressure, from the coal sample clamper, take out moisture coal sample, and calculate the water percentage of moisture coal sample, the coal sample clamper of again moisture coal sample being packed into, methane gas by high pressure gas transfer pipeline input certain pressure in the reference tank, to be full of water bath with thermostatic control in the body of pond, place together the water bath with thermostatic control that arranges in the body of pond with reference to tank and coal sample clamper like this, make with reference to the methane gas temperature in the tank and moisture coal sample temperature and all reach experimental temperature, (4) by the coal sample clamper moisture coal sample is loaded confined pressure and/or axial compression and voltage stabilizing, (5) in moisture coal sample, be filled with methane gas by connecting line with reference to tank, the adsorption process of beginning stand under load coal containing methane gas, moisture coal sample adsorption gas is not less than 12 hours, (6) treat after the coal sample adsorption equilibrium, pass through moisture separator from moisture coal sample inside gas and distilled water out, begin to carry out the parsing experimentation of stand under load coal containing methane gas, the desorption of mash gas amount is measured by recorder jar.
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