CN102053141B - Method for testing desorption characteristic of externally added water on gas-containing coal body - Google Patents

Method for testing desorption characteristic of externally added water on gas-containing coal body Download PDF

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Publication number
CN102053141B
CN102053141B CN 201010580065 CN201010580065A CN102053141B CN 102053141 B CN102053141 B CN 102053141B CN 201010580065 CN201010580065 CN 201010580065 CN 201010580065 A CN201010580065 A CN 201010580065A CN 102053141 B CN102053141 B CN 102053141B
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valve
pressure
water
tensimeter
coal
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CN102053141A (en
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程远平
吴冬梅
汪磊
刘海波
蒋静宇
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention relates to a device and method for testing the influence of externally added water to a desorption characteristic of a gas-containing coal body. The device comprises a vacuum-pumping system, a pressurization and gas injection system, a constant temperature system, a high-pressure water injection system and a desorption measuring system. The method comprises the following steps: carrying out high-pressure water injection after adsorption balance is carried out on the coal body; stirring to cause the water to be uniformly mixed in the coal body; and testing the desorption characteristic of the coal body. According to the invention, the actual situation after a coal seam is subjected to water injection is fully simulated, and the change of the desorption characteristic of the gas-containing coal body influenced by the externally added water can be tested, thus a gas desorption dynamic process after hydraulic measures are used for outburst prevention of an outburst coal seam can be further researched, the gap that no device for researching the desorption characteristic under the condition of externally adding water exists in China is filled, and the influence of externally added water on the desorption characteristic of the gas-containing coal body is tested; and meanwhile, the structure is simple, the test method is simple and convenient, and the use effect is good.

Description

Add moisture to the method for testing of coal containing methane gas body desorption properties
Technical field
The present invention relates to pressure water injection gas injection adsorbent equipment and the method for surface chemistry, kinetics of adsorption characteristic, and especially a kind of being applicable to simulated the coal containing methane gas layer adds the desorption of mash gas characteristic under the moisture condition in difference device and method in the laboratory.
Background technology
Coal in China output reached 30.3 hundred million t in 2009, had effectively ensured rapid growth of economy, also caused the colliery to be extended to the deep with the speed of 10~20m every year simultaneously, and many mines have entered deep mining.Along with the increase of mining depth, the coal seam terrestrial stress increases, gas pressure increases, and it is low to add gas permeability of coal seam, and gas is adopted preceding extraction difficulty, and coal and gas are given prominence to (hereinafter to be referred as giving prominence to) and explosion disaster is on the rise.For gas penetration potential, the minimizing extraction borehole quantities that increases the coal seam, about scientific research institution research with to have tested multiple waterpowerization anti-reflection and eliminate technology and the method for outburst hazard, comprise that coal seam water infusion, hydraulic flushing in hole, sluicing, hydraulic slotted liner technique, waterfrac treatment and waterpower extrudes etc.
The reason that coal seam outburst hazard effect is eliminated in the waterpower measure is summarized as follows: (1) increases the crack of coal body, the gas penetration potential in raising coal seam, improves the gas pumping effect; (2) expulsion gas, water under high pressure will speed up the discharging of free gas and part adsorption gas; (3) water enters crack and hole, has sealed the passage of adsorption gas desorb, reduces desorption of mash gas speed, reduces the energy that produces when gas discharges; (4) moistening coal body improves the mechanical property of coal body, makes in the area of stress concentration and moves, and the release guard band length increases.
Various waterpower measure essence all are the moisture that adds that has increased coal body to some extent, original coal body will change coal body pore texture and cranny development situation on the one hand under the effect that adds moisture, add moisture on the other hand and enter coal body hole and crack in the free gas of expulsion and part adsorption gas, also can seal the passage of adsorption gas desorb between crack and hole, hinder the desorption of mash gas process.Therefore, after coal body adds the moisture increase, its desorption of mash gas performance will change, and projecting coal bed desorption of mash gas speed, residual gas content, regional eliminating are produced significant impact except outburst danger index and gas pumping index etc.
At present, both at home and abroad the desorption of mash gas kinetic procedure research that the waterpower measure is used for after the projecting coal bed protrusion-dispelling rests on site test more, and on-the-spot phenomenon is described, and lacks to add moisture to the theoretical research of desorption of mash gas dynamic process influence.Former studies adds moisture and the experiment of desorption of mash gas dynamic process influence is adopted more is injected moisture earlier, carries out the experiment flow of high pressure adsorption gas and desorb gas again, though utilize existing high pressure adsorption experiment device more easily to experimentize, but be not inconsistent with the engineering actual conditions after the water filling of on-the-spot coal containing methane gas layer, and under this experiment flow, earlier the moisture that injects has been seized the adsorption potential of gas, and result of study can not reflect and adds moisture to the sealing process of gas in the coal body pore texture.The water filling coal body desorption of mash gas performance study that The former Russian scholar is carried out, owing to be subjected to the restriction of experiment condition, just in the laboratory, in the tank body of absorption high pressure gas, inject water under high pressure, coal sample is immersed in the water, the desorption performance of research coal sample, this and actual conditions differ greatly.Carrying out the projecting coal bed technological difficulties that add desorption of mash gas dynamic process experimental study under the moisture condition is, must at first in special-purpose tank body, adsorb high pressure gas with the dry coal sample, after reaching adsorption equilibrium, in the high pressure tank body, inject moisture again, by stirring, make moisture enter the coal containing methane gas body and also can evenly distribute, last test coal containing methane gas sample is at the desorption of mash gas dynamic process that adds under the moisture condition.
Summary of the invention
Technical matters: the purpose of this invention is to provide a kind of simple in structure, coal containing methane gas body that method of testing is easy, effective in the desorption properties proving installation and the method that add under the moisture condition.
Technical scheme: the moisture that adds of the present invention is to the proving installation of the desorption properties of coal containing methane gas body, comprise that pumped vacuum systems, pressurization gas injection system, constant temperature system, high pressure water injection system and desorb measure system, wherein: pump drainage tracheae and the 2nd valve that pumped vacuum systems comprises vacuum pump, link to each other with vacuum pump, be located at the pressure vacuum gauge on the pump drainage tracheae and be connected the 3rd valve on this pipeline; The pressurization gas injection system comprises gas cylinder, the high-pressure buffering pot that links to each other with gas cylinder and is located at the 1st valve on the two connecting line, reaches the 4th valve that is connected with the 1st tensimeter with tank connected the 1st tensimeter of high-pressure buffer; Constant temperature system comprises the pressure vessel that links to each other with high-pressure buffering pot and the 5th valve on the two connecting line, the 2nd tensimeter that links to each other with pressure vessel, the constant water bath box that pressure vessel is housed; The high pressure water injection system comprise dosing container, the stirring apparatus that links to each other with pressure vessel and be located at retaining valve and the 6th valve on the two connecting line, link to each other with dosing container increase liquid pump and be connected the two connecting line on the 3rd tensimeter and the two connecting line on the 7th valve, with increase the water tank that liquid pump links to each other and be located at the 8th valve on the two connecting line; Desorb mensuration system comprises the desorb graduated cylinder that is connected with the 6th valve.
The moisture that adds of the present invention is to the method for testing of the desorption properties of coal containing methane gas body, and step is as follows:
(a) the to be tested dry coal sample that takes by weighing the 1-3mm particle diameter of about 60g is packed in the pressure vessel, open pressure vessel be connected with vacuum pump the 2nd valve, the 3rd valve, the 5th valve on the pipeline, pressure vessel is vacuumized, simultaneously the constant water bath box of filling with water is heated to 60 ℃;
(b) observe the pressure vacuum gauge that is connected with vacuum pump, when the pneumatics power of taking seriously is down to 0.4Pa, after continuing to vacuumize 4~6h, closing presure container be connected with vacuum pump the 2nd valve, the 3rd valve, the 5th valve on the pipeline, open the 1st valve, the 4th valve, observe and tank connected the 1st tensimeter of high-pressure buffer, when showing that pressure reaches predetermined pressure, close the 1st valve;
(c) constant water bath box that will fill with water is adjusted to about 30 ℃, opens the 5th valve, observes the 2nd tensimeter that is connected with pressure vessel, when demonstration pressure no longer rises, closes the 5th valve;
(d) after pressure vessel carries out balance 48h, the 2nd tensimeter that is connected with pressure vessel shows when pressure no longer changes, the record equalized pressure that this moment, the 2nd tensimeter showed;
(e) open the 8th valve, the 7th valve, startup increases liquid pump water in the water tank is forced in the dosing container, observe the 3rd tensimeter be connected with dosing container, when it showed pressure greater than the equalized pressure of the 2nd tensimeter demonstration, dosing container mesohigh water entered in the pressure vessel by retaining valve;
(f) observe water level in the water tank, when water level reduces 1mm, close and increase all valves between liquid pump and water tank and the pressure vessel;
(g) start the stirring apparatus link to each other with pressure vessel, move about 2h after, leave standstill 6h;
(h) open the 6th valve, when the 3rd tensimeter pressure that is connected with dosing container is shown as normal pressure, open the valve that is connected with the desorb graduated cylinder, pick up counting and measure the desorption process of coal sample.
Beneficial effect: the present invention at coal body to the laggard horizontal high voltage water filling of gas adsorption equilibrium, and by stirring moisture is evenly mixed in coal body, afterwards its desorption properties is tested, the actual conditions after the water filling of on-the-spot coal containing methane gas layer have fully been simulated, can test the coal containing methane gas body in the variation that adds its desorption properties under the moisture effects, make the waterpower measure can access more deep research for the desorption of mash gas dynamic process after the projecting coal bed protrusion-dispelling, fill up domestic to the coal containing methane gas body in the blank that adds desorption properties research device under the moisture condition, test coal containing methane gas body its desorption properties institute after adding moisture is influenced, it is simple in structure, method of testing is easy, result of use is good, has practicality widely.
Description of drawings
Fig. 1 is installation drawing of the present invention.
Among the figure: 1-gas cylinder, 2-vacuum pump, 3-pressure vacuum gauge, 4-high-pressure buffering pot, 5-a ~ 5-c tensimeter, the 6-pressure vessel, 7-stirring apparatus, 8-constant water bath box, 9-retaining valve, 10-dosing container, 11-increases liquid pump, 12-water tank, 13-desorb graduated cylinder, F-1 ~ F-8 valve.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
Shown in the accompanying drawing, device of the present invention mainly is made up of pumped vacuum systems, pressurization gas injection system, constant temperature system, high pressure water injection system and desorb mensuration system, and wherein: pumped vacuum systems comprises vacuum pump 2, the pump drainage tracheae that links to each other with vacuum pump 2 and the 2nd valve F-2, be located at the pressure vacuum gauge 3 on the pump drainage tracheae and be connected the 3rd valve F-3 on this pipeline; The pressurization gas injection system comprises gas cylinder 1, the high-pressure buffering pot 4 that links to each other with gas cylinder 1 and the valve F-4 that is located at the 1st valve F-1 on the two connecting line, the tensimeter 5-a that is connected with high-pressure buffering pot 4 and is connected with tensimeter 5-a; Constant temperature system comprises the pressure vessel 6 that links to each other with high-pressure buffering pot 4 and the valve F-5 on the two connecting line, the tensimeter 5-b that links to each other with pressure vessel 6, the constant water bath box 8 that pressure vessel 6 is housed; The high pressure water injection system comprise dosing container 10, the stirring apparatus 7 that links to each other with pressure vessel 6 and be located at retaining valve 9 and valve F-6 on the two connecting line, link to each other with dosing container 10 increase liquid pump 11 and be connected the two connecting line on tensimeter 5-c and the two connecting line on valve F-7, with increase the water tank 12 that liquid pump 11 links to each other and be located at valve F-8 on the two connecting line; Desorb mensuration system comprises the desorb graduated cylinder 13 that is connected with valve F-6.
Method of testing of the present invention is as follows:
(a) the to be tested dry coal sample that takes by weighing 60g, 1-3mm particle diameter is packed in the pressure vessel 6, sealed pressure vessel 6, open all valves on pressure vessel 6 and vacuum pump 2 connecting lines, pressure vessel 6 is vacuumized, the water bath with thermostatic control 8 of filling with water is heated to 60 ℃;
(b) observe the pressure vacuum gauge 3 that is connected with vacuum pump 2, the pneumatics power of taking seriously is down to below the 0.4Pa, continue to vacuumize 4~6h, after removing the foreign gas of adsorbing in the coal sample, all valves on closing presure container 6 and vacuum pump 2 connecting lines are opened the 1st valve F-1, the 4th valve F-4, observe the 1st tensimeter 5-a that is connected with high-pressure buffering pot 4, when showing that pressure reaches 4MPa, close the 1st valve F-1;
(c) constant water bath box 8 that will fill with water is adjusted to about 30 ℃, opens the 5th valve F-5, observes the 2nd tensimeter 5-b that is connected with pressure vessel 6, closes the 5th valve F-5 when demonstration pressure no longer rises;
(d) after pressure vessel 6 carries out the about 48h of balance, the 2nd tensimeter 5-b that is connected with pressure vessel 6 shows when pressure no longer changes, the record equalized pressure that this moment, the 2nd tensimeter 5-b showed;
(e) open the 8th valve F-8, the 7th valve F-7, startup increases liquid pump 11 water in the water tank 12 is forced in the dosing container 10, observe the 3rd tensimeter 5-c that is connected with dosing container 10, when it showed the equalized pressure that pressure shows greater than the 2nd tensimeter 5-b, dosing container 10 mesohigh water can enter in the pressure vessel 6 by retaining valve 9;
(f) observe water tank 12 middle water levels, when water level reduces 1mm, close and increase all valves between liquid pump 11 and water tank (12) and the pressure vessel 6;
(g) start the stirring apparatus 7 link to each other with pressure vessel 6, move about 2h after, leave standstill about 6h;
(h) open the 6th valve F-6, when the 3rd tensimeter 5-c pressure that is connected with dosing container 10 is shown as normal pressure, desorb graduated cylinder 13 is connected with the 6th valve F-6, and the desorption process of the mensuration coal sample that picks up counting, the desorption data that record desorb buret is surveyed.

Claims (1)

1. one kind adds moisture to the method for testing of coal containing methane gas body desorption properties, the proving installation of this method of testing comprises and adopts pumped vacuum systems, pressurization gas injection system, constant temperature system, high pressure water injection system and desorb to measure system, and wherein: pumped vacuum systems comprises vacuum pump (2), the pump drainage tracheae that links to each other with vacuum pump (2) and the 2nd valve (F-2), be located at the pressure vacuum gauge (3) on the pump drainage tracheae and be connected the 3rd valve (F-3) on this pipeline; The pressurization gas injection system comprises gas cylinder (1), the high-pressure buffering pot (4) that links to each other with gas cylinder (1) and the 4th valve (F-4) that is located at the 1st valve (F-1) on the two connecting line, the 1st tensimeter (5-a) that is connected with high-pressure buffering pot (4) and is connected with the 1st tensimeter (5-a); Constant temperature system comprises the pressure vessel (6) that links to each other with high-pressure buffering pot (4) and the 5th valve (F-5) on the two connecting line, the 2nd tensimeter (5-b) that links to each other with pressure vessel (6), the constant water bath box (8) that pressure vessel (6) are housed; The high pressure water injection system comprise dosing container (10), the stirring apparatus (7) that links to each other with pressure vessel (6) and be located at retaining valve (9) and the 6th valve (F-6) on the two connecting line, link to each other with dosing container (10) increase liquid pump (11) and be connected the two connecting line on the 3rd tensimeter (5-c) and the two connecting line on the 7th valve (F-7), with increase the water tank (12) that liquid pump (11) links to each other and be located at the 8th valve (F-8) on the two connecting line; Desorb mensuration system comprises the desorb graduated cylinder (13) that is connected with the 6th valve (F-6), it is characterized in that comprising the steps:
(a) the to be tested dry coal sample that takes by weighing the 60g1-3mm particle diameter is packed in the pressure vessel (6), sealed pressure vessel (6), open pressure vessel (6) be connected with vacuum pump (2) the 2nd valve (F-2), the 3rd valve (F-3), the 5th valve (F-5) on the pipeline, pressure vessel (6) is vacuumized, simultaneously the constant water bath box (8) of filling with water is heated to 60 ℃;
(b) observe the pressure vacuum gauge (3) that is connected with vacuum pump (2), when the pneumatics power of taking seriously is down to 0.4Pa, after continuing to vacuumize 4~6h, closing presure container (6) be connected with vacuum pump (2) the 2nd valve (F-2), the 3rd valve (F-3), the 5th valve (F-5) on the pipeline, open the 1st valve (F-1), the 4th valve (F-4), observe the 1st tensimeter (5-a) that is connected with high-pressure buffering pot (4), when showing that pressure reaches predetermined pressure, close the 1st valve (F-1);
(c) constant water bath box (8) that will fill with water is adjusted to 30 ℃, opens the 5th valve (F-5), observes the 2nd tensimeter (5-b) that is connected with pressure vessel (6), when demonstration pressure no longer rises, closes the 5th valve (F-5);
(d) after pressure vessel (6) carries out balance 48h, the 2nd tensimeter (5-b) that is connected with pressure vessel (6) shows when pressure no longer changes, the equalized pressure that record the 2nd tensimeter this moment (5-b) shows;
(e) open the 8th valve (F-8), the 7th valve (F-7), startup increases liquid pump (11) water in the water tank (12) is forced in the dosing container (10), observe the 3rd tensimeter (5-c) that is connected with dosing container (10), when it showed the equalized pressure that pressure shows greater than the 2nd tensimeter (5-b), dosing container (10) mesohigh water entered in the pressure vessel (6) by retaining valve (9);
(f) observe water level in the water tank (12), when water level reduces 1mm, close and increase all valves between liquid pump (11) and water tank (12) and the pressure vessel (6);
(g) start the stirring apparatus (7) that links to each other with pressure vessel (6), behind the operation 2h, leave standstill 6h;
(h) open the 6th valve (F-6), when the 3rd tensimeter (5-c) that is connected with dosing container (10) when pressure is shown as normal pressure, open the valve (F-6) that is connected with desorb graduated cylinder (13), pick up counting and measure the desorption process of coal sample.
CN 201010580065 2010-12-09 2010-12-09 Method for testing desorption characteristic of externally added water on gas-containing coal body Expired - Fee Related CN102053141B (en)

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