CN102230394A - Secondary hole sealing system for improving coal bed gas extraction concentration - Google Patents
Secondary hole sealing system for improving coal bed gas extraction concentration Download PDFInfo
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- CN102230394A CN102230394A CN2011101348526A CN201110134852A CN102230394A CN 102230394 A CN102230394 A CN 102230394A CN 2011101348526 A CN2011101348526 A CN 2011101348526A CN 201110134852 A CN201110134852 A CN 201110134852A CN 102230394 A CN102230394 A CN 102230394A
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Abstract
The invention discloses a secondary hole sealing system for improving coal bed gas extraction concentration, and is particularly suitable for extracting borehole gas in coal roadways or stone drifts. The secondary hole sealing system is mainly composed of a compressed air tube, a control valve, a reducing valve, a secondary hole sealing device, a pressure gage, an inlet tube, a breather tube, a gas-liquid mixed flow tube, an atomizer, a transparent rubber tube, a diffuser and the like. In the gas extraction process, a drilling zone generates an air leak gap to lower gas concentration. Then, the pressure of high-pressure air in an underground compressed air system is lowered by the reducing valve to proper pressure after passing through a compressed air tube, and then, tiny expansion powder is sent to a chamber communicating with the air leak gap via a secondary hole sealing device so as to enter the air leak gap. The atomizer atomizes clear water in an underground water supply system to provide sufficient water source for powder in the air leak gap, and the powder is fully expanded so as to totally seal the air leak gap. The system has simple structure, is convenient to operate, does not contain electrical appliance elements, is safe and reliable and can drastically improve the borehole gas extraction effect.
Description
Technical field
The present invention relates to a kind of secondary hole sealing system that improves coal-bed gas extraction concentration, be particularly useful for the boring gas pumping in coal road or rock gangway place.
Background technology
The gas disaster is one of main natural calamity of China's coal-mine, has become the principal contradiction of restriction Safety of Coal Mine Production at present.By construction drill extraction coal-bed gas is the important means that the gas disaster is administered in the colliery.Yet in the gas pumping later stage, the boring zone can produce the crack of leaking out, and this has become the bottleneck of the efficient mash gas extraction of restriction boring.For this reason, the engineers and technicians in this field have done a large amount of research to the secondary hole sealing method of coal bed gas drainage boring, have proposed the leak out principle of crack passage of fine expansion powder shutoff mash gas pumping drilling zone coal (rock).And developed the secondary hole sealing device of firedamp taking-out discharging drilling, this device is when sealing of hole, function singleness, the conveying of uncontrollable powder, and powder to enter the loss of crack static pressure bigger, in addition, under the coal mine and boring zone is limited for the moisture that powder provides, therefore can not make the abundant imbibition of powder, influence the effect in powder shutoff crack, cause the powder shutoff crack technology of leaking out in the promoting the use of of mine, to be restricted.
Summary of the invention
Technical problem: the objective of the invention is to overcome the weak point in the prior art, provide a kind of system simple, easy to operate, can control powder and carry, and can make the secondary hole sealing system of the raising coal-bed gas extraction concentration of the abundant imbibition of powder.
The secondary hole sealing system of raising coal-bed gas extraction concentration of the present invention, comprise the I control valve that is located at successively on the compressed air hose, reducing valve, secondary hole sealing device, the discharging opening of secondary hole sealing device is connected with discharge nozzle, the air inlet port place of described secondary hole sealing device is connected with the II control valve, be connected with the ventilating pipe of controlling by the VI control valve through threeway on the pipeline between II control valve and the reducing valve, be provided with the I pressure meter on the discharge nozzle of secondary hole sealing device successively, III control valve and the gas-liquid mixed flow tube that is connected through threeway, be connected with the transparent hose that to resist 0.4～0.6MPa pressure on the discharging opening of described discharge nozzle, be connected with diffuser through transparent hose; Be connected with the atomizer that links to each other with water inlet pipe on the described ventilating pipe, be provided with IV control valve and II pressure meter successively on the water inlet pipe of atomizer inlet, the atomizer outlet links to each other with the gas-liquid mixed flow tube, and the gas-liquid mixed flow tube is provided with the V control valve.
Described pressure meter and pipeline junction are provided with gauze wire cloth, and gauze wire cloth mesh order number is 140～160 orders; Described diffuser is the circular cone tube that a section enlarges gradually, and the cone angle of awl tube is 6～8 °, and the outlet cross-sectional area of awl tube is 3～4 with the ratio of inlet section.
Beneficial effect: the present invention utilizes the compressed-air system and the water system of down-hole, for powder shutoff crack provides wind regime and water source; By the pressure gauge reading at secondary hole sealing device discharging opening place, reflect the resistance situation that powder is carried indirectly in the crack, and provide distinguishing rule for stopping the powder conveying; Be provided with the gauze wire cloth of certain order number by pressure meter on the secondary hole sealing device discharging opening pipeline and pipeline junction, can stop powder to enter pressure meter; By utilizing the atomization of liquid function of atomizer, for powder provides sufficient but inexcessive moisture; By control valve and reducing valve, realized that easily powder is carried and the conveying of moisture; The diffuser of sending into chamber changes the ram compression major part of air outlet into static pressure, reduces the ram compression loss of air outlet, improves effective static pressure; Transparent hose in this system can be seen the mobility status of powder intuitively; This system does not contain electric elements, and is safe and reliable in the down-hole, and can increase substantially the gas pumping effect of boring.
Description of drawings
Fig. 1 is the secondary hole sealing system schematic of raising coal-bed gas extraction concentration of the present invention.
Among the figure: compressed air hose-1, I control valve-2, reducing valve-3, II control valve 4, secondary hole sealing device-5, I pressure meter-6, III control valve-7, transparent hose-8, diffuser-9, fine expansion powder-10, the crack of leaking out-11, water inlet pipe-12, IV control valve-13, II pressure meter-14, atomizer-15, ventilating pipe-16, V control valve-17, VI control valve-18, discharge nozzle-19, gas-liquid mixed flow tube-20.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
Shown in the accompanying drawing, through connector compressed air hose 1 is connected on the air line of down-hole, the other end of compressed air hose 1 connects I control valve 2 successively by pipeline, reducing valve 3, threeway, II control valve 4, secondary hole sealing device 5 and discharge nozzle 19, connect pressure meter 6 and III control valve 7 on the discharge nozzle 19 successively, wherein pressure meter 6 is 140～160 purpose gauze wire cloths with pipeline junction pad one deck order number, the discharging opening of discharge nozzle 19 connects the another one threeway, and connect the transparent hose 8 to resist 0.4～0.6MPa pressure by pipeline, connect diffuser 9 through transparent hose 8, this diffuser 9 is the circular cone tube that a section enlarges gradually, the cone angle of awl tube is 6～8 °, the outlet cross-sectional area of awl tube is 3～4 with the ratio of inlet section, diffuser 9 is sent into linked up the boring zone and leak out in the chamber 10 in crack 11; Through connector water inlet pipe 12 is connected on the supply channel of down-hole, the other end connects IV control valve 13 and II pressure meter 14 by pipeline successively, and be connected with atomizer 15 through the water inlet of atomizer 15, atomizer 15 outlets connect gas-liquid mixed flow tube 20, connect V control valve 17 on the gas-liquid mixed flow tube 20, and finally connect the threeway at the discharging opening place of discharge nozzle 19; The threeway that ventilating pipe 16 air inlet ports connection reducing valve 3 and control valve are 4 connects VI control valve 18 on the ventilating pipe 16, ventilating pipe 16 gas outlets are connected with atomizer 15 air inlet ports.
Operating principle: closed control valve 18 and V control valve 17, open I control valve 2, II control valve 4 and III control valve 7, gases at high pressure in the compressed-air system of down-hole are by compressed air hose 1, through reducing valve 3 pressure of gas is dropped to 0.2MPa, gas is through secondary hole sealing device 5, fine expansion powder 10 is transported in the chamber 10 by transparent hose 8 and diffuser 9, and then enter in the crack 11 of leaking out, diffuser 9 can make the ram compression of the gas that carries fine expansion powder 10 reduce, its static pressure is raise, thereby make farther that fine expansion powder 10 transports in the crack 11 of leaking out, when pressure meter 6 readings in secondary hole sealing device 5 exits reach 0.4MPa, show the fine expansion powder 10 shutoff crack 11 of leaking out almost completely, the flow resistance of gas in the crack 11 of leaking out strengthens, cause gas-static to increase, close II control valve 4 this moment, III control valve 7 and IV control valve 13; Open VI control valve 18 and V control valve 17, slowly open IV control valve 13 then, observe II pressure meter 14 readings, when treating that II pressure meter 14 readings rise to 0.2 MPa, stop turn IV control valve 13, water source and source of the gas are behind atomizer 15, clear water in the water system of down-hole is atomized, be transported in the crack 11 of leaking out through transparent hose 8, leak out fine expansion powder 10 imbibitions in the crack 11, the shutoff crack 11 of leaking out, and fine expansion powder 10 fully is difficult for being sucked in the gas pumping pipeline by the negative pressure in the boring in boring gas pumping process, fine expansion powder 10 shutoff this moment crack 11 end of leaking out.
Claims (3)
1. improve the secondary hole sealing system of coal-bed gas extraction concentration, comprise the I control valve (2) that is located at successively on the compressed air hose (1), reducing valve (3), secondary hole sealing device (5), the discharging opening of secondary hole sealing device (5) is connected with discharge nozzle (19), it is characterized in that: the air inlet port place of described secondary hole sealing device (5) is connected with II control valve (4), be connected with the ventilating pipe of controlling by VI control valve (18) (16) through threeway on the pipeline between II control valve (4) and the reducing valve (3), be provided with I pressure meter (6) successively on the discharge nozzle (19) of secondary hole sealing device (5), III control valve (7) and the gas-liquid mixed flow tube (20) that is connected through threeway, be connected with the transparent hose (8) that to resist 0.4～0.6MPa pressure on the discharging opening of described discharge nozzle (19), be connected with diffuser (9) through transparent hose (8); Be connected with the atomizer (15) that links to each other with water inlet pipe (12) on the described ventilating pipe (16), be provided with IV control valve (13) and II pressure meter (14) successively on the water inlet pipe (12) of atomizer (15) inlet, atomizer (15) outlet links to each other with gas-liquid mixed flow tube (20), and gas-liquid mixed flow tube (20) is provided with V control valve (17).
2. the secondary hole sealing system of raising coal-bed gas extraction concentration according to claim 1 is characterized in that: described I pressure meter (6) is provided with gauze wire cloth with the pipeline junction, and gauze wire cloth mesh order number is 140～160 orders.
3. the secondary hole sealing system of raising coal-bed gas extraction concentration according to claim 1, it is characterized in that: described diffuser (9) is the circular cone tube that a section enlarges gradually, the cone angle of awl tube is 6～8 °, and the outlet cross-sectional area of awl tube is 3～4 with the ratio of inlet section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110134852 CN102230394B (en) | 2011-05-24 | 2011-05-24 | Secondary hole sealing system for improving coal bed gas extraction concentration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110134852 CN102230394B (en) | 2011-05-24 | 2011-05-24 | Secondary hole sealing system for improving coal bed gas extraction concentration |
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| CN102230394A true CN102230394A (en) | 2011-11-02 |
| CN102230394B CN102230394B (en) | 2013-02-13 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587889A (en) * | 2012-02-10 | 2012-07-18 | 中国矿业大学 | Experimental system for simulating solid-phase particles to plug coal (rock) cracks |
| CN102797425A (en) * | 2012-08-27 | 2012-11-28 | 王清刚 | Wind-water linked atomized dust removing and cleaning device for coal bed drilling exploration |
| CN102913273A (en) * | 2012-10-31 | 2013-02-06 | 中国矿业大学 | Autonomous dynamic sealing and gas extraction intelligent system for coal mine |
| CN103758483A (en) * | 2014-01-23 | 2014-04-30 | 中国矿业大学 | Secondary hole sealing method for treating broken area after extraction of crossing hole |
| CN104989356A (en) * | 2015-06-10 | 2015-10-21 | 太原理工大学 | Underground coal mine coal seam drilling high-pressure gas fracturing and permeability increasing method and system |
| CN107359299A (en) * | 2016-05-10 | 2017-11-17 | 宁德时代新能源科技股份有限公司 | Gas production extraction device |
| CN108825296A (en) * | 2018-07-19 | 2018-11-16 | 河南理工大学 | A kind of static anti-reflection heating promotion gas pumping method of solid matter |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587889A (en) * | 2012-02-10 | 2012-07-18 | 中国矿业大学 | Experimental system for simulating solid-phase particles to plug coal (rock) cracks |
| CN102587889B (en) * | 2012-02-10 | 2015-04-22 | 中国矿业大学 | Experimental system for simulating solid-phase particles to plug coal (rock) cracks |
| CN102797425A (en) * | 2012-08-27 | 2012-11-28 | 王清刚 | Wind-water linked atomized dust removing and cleaning device for coal bed drilling exploration |
| CN102797425B (en) * | 2012-08-27 | 2014-12-10 | 王清刚 | Wind-water linked atomized dust removing and cleaning device for coal bed drilling exploration |
| CN102913273A (en) * | 2012-10-31 | 2013-02-06 | 中国矿业大学 | Autonomous dynamic sealing and gas extraction intelligent system for coal mine |
| CN102913273B (en) * | 2012-10-31 | 2014-11-19 | 中国矿业大学 | Autonomous dynamic sealing and gas extraction intelligent system for coal mine |
| CN103758483A (en) * | 2014-01-23 | 2014-04-30 | 中国矿业大学 | Secondary hole sealing method for treating broken area after extraction of crossing hole |
| CN103758483B (en) * | 2014-01-23 | 2016-02-24 | 中国矿业大学 | A kind ofly process the secondary hole sealing method that layer-through drilling takes out rear broken region |
| CN104989356A (en) * | 2015-06-10 | 2015-10-21 | 太原理工大学 | Underground coal mine coal seam drilling high-pressure gas fracturing and permeability increasing method and system |
| CN107359299A (en) * | 2016-05-10 | 2017-11-17 | 宁德时代新能源科技股份有限公司 | Gas production extraction device |
| CN107359299B (en) * | 2016-05-10 | 2020-07-17 | 宁德时代新能源科技股份有限公司 | Gas production extraction device |
| CN108825296A (en) * | 2018-07-19 | 2018-11-16 | 河南理工大学 | A kind of static anti-reflection heating promotion gas pumping method of solid matter |
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| CN102230394B (en) | 2013-02-13 |
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