CN105201546A - Device and method for improving gas extraction concentration - Google Patents
Device and method for improving gas extraction concentration Download PDFInfo
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- CN105201546A CN105201546A CN201510601895.9A CN201510601895A CN105201546A CN 105201546 A CN105201546 A CN 105201546A CN 201510601895 A CN201510601895 A CN 201510601895A CN 105201546 A CN105201546 A CN 105201546A
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- gas
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- pumping pipe
- gas pumping
- concentration sensor
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- 238000000605 extraction Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000005086 pumping Methods 0.000 claims description 82
- 239000002184 metal Substances 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 21
- 239000003245 coal Substances 0.000 claims description 15
- 229920000742 Cotton Polymers 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 7
- 238000007596 consolidation process Methods 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000003795 desorption Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000011799 hole material Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a device and a method for improving gas extraction concentration. The device comprises a gas extraction pipe, a metallic net cage, activated carbon blocks, a gas concentration sensor, an electromagnetic valve and the like, wherein the activated carbon blocks fill up the metallic net cage; the metallic net cage is contained in the gas extraction pipe and is lowered into an extraction borehole together with the extraction pipe; the gas concentration sensor is tied on the outer wall of the extraction pipe in the borehole; the external portion of the borehole is connected with the electromagnetic valve, and a control console on the electromagnetic valve can automatically control the opening and closing of the electromagnetic valve by reading gas concentration change on the gas concentration sensor. By using the huge adsorption difference of the activated carbon to methane molecules under a variable-pressure effect, gas which is stored in advance is desorbed intensively by the activated carbon when the valve is opened, the extraction concentration of borehole gas is effectively improved and the problems of slow gas desorption speed and low extraction concentration during traditional gas extraction are solved.
Description
Technical field
The present invention relates to a kind of device and method improving gas extraction concentration, belong to drilling gas extraction field.
Background technology
The a large amount of gas produced in adjoint progress of coal mining constitute great threat for the safety in production in colliery.The disaster such as coal and gas prominent, gas explosion is once occur namely to cause great casualties and huge economic loss.All the time, technology personnel are at the gas amount being devoted to produce in exploitation reducig process by various means, and wherein, a kind of the most frequently used method sets up gas drainage system exactly, by construction extraction borehole pre-mining drainage coal-bed gas.But, poor for most of gas permeability of coal seam, ature of coal is soft, the mine that geostatic stress is large, often effect is better in earlier stage in extraction for gas drainage system, but to during the extraction later stage because the extraction borehole of down-hole is subject to tunnel initating, the mining influences such as the advance of the face cause stress to concentrate, this maintains the hollow PVC gas pumping pipe of the hard thin-wall of its basic configuration and more easily causes at present still supporting boring by self anti-pressure ability and boring self-stable ability the shrinkage strain accelerating extraction borehole, local collapse hole, gas pumping pipe is out of shape, blocking, even just be fully densified within a short period of time, boring is scrapped completely, be difficult to for Gas Flow and extraction provide express passway, the gas density that extraction goes out is extremely low, the gas overwhelming majority of extracting out is air, so, extraction is also that futile effort is had no result for a long time again.Especially, the gas density that extraction goes out once run into naked light gas explosion will occur, not only cannot as the utilization of resources, and bring serious threat safely can to methane gas extraction pipeline 5%-16% time.All the time, the too low gas pumping of concentration does not out reach the standard of industrial utilization afterwards, is forced to enter in air, not only increases greenhouse effect, and is a kind of wasting of resources greatly.
At present, improving the method major part of gas extraction concentration is improve sealing quality, and the angle that reduces gas leakage is starting point.Although existing hole sealing technology is of a great variety, adopt the methods such as the direct shutoff of organic material, inorganic material or hole packer shutoff to carry out sealing of hole nothing more than, none can accomplish absolute air tight, and the undesirable gas density that extraction is gone out of sealing of hole effect is not high.Some mines are by closing indivedual extraction borehole to obtain higher gas extraction concentration, but owing to can not accurately locate, sometimes usually a boring is leaked gas and has to close large stretch of extraction borehole, greatly have impact on normal gas pumping work, not only inefficiency, but also hide some dangers for for safety in production.
Therefore, create a kind of method that can improve gas extraction concentration, the high concentration extraction realizing gas not only can provide safeguard for safety in production, improves extraction efficiency, and the pollution decreased air, achieve the industrial utilization of gas as a kind of clean energy resource.
Summary of the invention
The present invention, in order to solve weak point of the prior art, provides that a kind of extraction efficiency is high, safe and reliable, the device of the raising gas extraction concentration of clean environment firendly,
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of device improving gas extraction concentration, comprise console, operating desk and gas pumping pipe, the part of gas pumping pipe in boring offers sieve aperture on tube wall, console and operating desk are all located on the gas pumping pipe outside boring, gas pumping pipe inside in boring is provided with several metal cylinder moulds along its length, metal cylinder mould inside is filled with activated carbon block, gas pumping pipe outer wall side is provided with gas concentration sensor, gas concentration sensor is connected with data signal line, the gauge tap that the sieve aperture of data signal line on drainage tube enters on gas pumping Guan Houyu console connects, operating desk is provided with the electromagnetic valve for folding gas pumping pipe, gauge tap is connected with electromagnetic valve by control signal wire.
Metal cylinder mould is column structure, the diameter of metal cylinder mould is slightly less than the internal diameter of gas pumping pipe, the length of metal cylinder mould is equal with the single long length of gas pumping pipe, and the mesh diameter of metal cylinder mould is 0.5-1cm, has the gap of 3-5mm between metal cylinder mould and gas pumping inside pipe wall.
The size dimension of activated carbon block is greater than the mesh size of metal cylinder mould.
Improve a method for gas extraction concentration, comprise the steps:
(1) comprehensive drillable length and coal seam physical property design following parameter: gas pumping length of tube, sealing of hole segment length, the position of gas concentration sensor on gas pumping pipe;
(2), after gas concentration sensor is connected with data signal line, with adhesive tape, gas concentration sensor is strapped on gas pumping pipe outer wall relevant position, the wire lath cage mounted that activated carbon block is housed is entered in gas pumping pipe, enters in sieve aperture by under gas pumping pipe;
(3) adopt " two stifled notes " method of pore sealing in the sealing of hole section of drilling orifice shutoff one segment length 5-8m;
(4) be connected with gauge tap by the data signal line of gas concentration sensor, the gauge tap other end is connected with electromagnetic valve by control signal wire, and console can realize the automatic open-close of electromagnetic valve by the variation ofgas density read on gas concentration sensor;
(5) open the gas pumping pump be connected on gas pumping pipe, carry out the operation of negative pressure mash gas extraction.
(6) when gas density in extraction borehole lower than 16% time, gas concentration sensor exports signal to console, console exports the closed electromagnetic valve on electromagnetic signal control operation platform, and the activated carbon block now in metal cylinder mould starts to adsorb the gas that a large amount of coal seam parses; When gas density in extraction borehole is more than 30%, gas concentration sensor exports signal to console, the electromagnetic valve that console exports on electromagnetic signal control operation platform is opened, proceed negative pressure extraction, now activated carbon block starts to resolve gas, and the gas that activated carbon block is resolved by gas pumping pump is extracted out;
(7) repeat step (6), until the gas density in extraction borehole is lower than after 16% lasting 24-48h, after being less than 8m3/t to the gas pressure in coal seam lower than 0.74MPa and relative gas bearing capacity outburst amount after testing, closing extraction pump, complete extraction operation.
Gas concentration sensor is at the setting position distance drilling orifice 15-20m of gas pumping pipe outer wall.
" two stifled notes " method of pore sealing particular content in step (3) is: a certain amount of polyurethane A mixed of uniform application on first paragraph cotton strap, B expects, first paragraph cotton strap is wrapped in rapidly the inner of drainage tube and sealing of hole section, gas pumping pipe is filled in boring fast, then with a certain amount of polyurethane A mixed of same uniform application, boring is filled in fast together with Grouting Pipe is wrapped in gas pumping pipe by the second segment cotton strap that B expects, after treating second segment cotton strap expansion consolidation, in enclosure space, cement mortar is injected by reserved Grouting Pipe with grouting pump, slurry consolidation forms sealing of hole section later.
Adopt technique scheme, the present invention has following beneficial effect:
1. when in holing, gas density is lower, shut electromagnetic valve, stop extraction, in boring, gas pressure raises gradually, now activated carbon block adsorbs a large amount of methane molecules, when absorption reaches capacity, when in gas pumping pipe, gas density raises gradually, open electromagnetic valve, start gas pumping, in gas pumping pipe, gas increasing pressure is low, now activated carbon block start resolve before absorption gas, utilize " the interim storage room " of the superpower activated carbon block of methane adsorption ability as gas pumping, the gas previously adsorbed is concentrated and resolves, the gas of high concentration is directly obtained by pressure change during negative pressure extraction, decrease ground Purification during industrial utilization in the past, improve operating efficiency, improve the economic benefit of enterprise.
2. electromagnetic valve controls the start-stop of extraction automatically according to variation ofgas density in boring, avoid a boring in the past leak gas and have to close the blindness of large stretch of extraction borehole, the present invention can accomplish that accurately location also closes the extraction of low concentration gas boring automatically, drastically increases operating efficiency.
3. between the activated carbon block in gas pumping pipe and tube wall, leave gap, during permission sieve aperture collapse hole there is the distortion of small scale in gas pumping pipe, now the elasticity of gas pumping pipe surrounding medium inner accumulated can effectively be discharged, after the gas pumping tube wall after distortion contacts with activated carbon block, activated carbon block effectively can improve the radial crushing strength of gas pumping pipe as the inner support point of hollow thin-wall gas pumping pipe, stop gas pumping pipe to continue distortion, the support pattern of this " initiatively allow pressure " drastically increases the ability that collapse hole resisted by gas pumping pipe.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device improving gas extraction concentration;
Fig. 2 is A-A sectional drawing in Fig. 1.
Detailed description of the invention
By a kind of device improving gas extraction concentration shown in Fig. 1 and Fig. 2, comprise console 1, operating desk 2 and gas pumping pipe 3, the part of gas pumping pipe 3 in boring offers sieve aperture 6 on tube wall, console 1 and operating desk 2 are all located on the gas pumping pipe 3 outside boring 11, gas pumping pipe 3 inside in boring 11 is provided with several metal cylinder moulds 4 along its length, metal cylinder mould 4 inside is filled with activated carbon block 5, gas pumping pipe 3 outer wall side is provided with gas concentration sensor 7, gas concentration sensor 7 is connected with data signal line 8, data signal line 8 enters after gas pumping pipe 3 through sieve aperture 6 and is connected with the gauge tap 9 on console 1, operating desk 2 is provided with the electromagnetic valve 10 for folding gas pumping pipe 3, gauge tap 9 is connected with electromagnetic valve 10 by control signal wire.
Metal cylinder mould 4 is in column structure, the diameter of metal cylinder mould 4 is slightly less than the internal diameter of gas pumping pipe 3, the length of metal cylinder mould 4 is equal with the single long length of gas pumping pipe 3, and the mesh diameter of metal cylinder mould 4 is 0.5-1cm, has the gap of 3-5mm between metal cylinder mould 4 and gas pumping pipe 3 inwall.
The size dimension of activated carbon block 5 must be greater than metal cylinder mould 4 place mesh diameter, avoids activated carbon block 5 from the mesh of metal cylinder mould 4 out like this.
Improve a method for gas extraction concentration, comprise the steps:
(1) the comprehensive parameter such as drillable length and coal seam physical property is (along coal bed gas extraction boring 11 dark 88m, aperture 94mm; Coal Quality is soft, and geostatic stress is large, and extraction borehole 11 is collapse hole easily.) design following parameter: need gas pumping pipe 3 totally 40, gas pumping pipe 3 length 2m, gas pumping pipe 3 external diameter 50mm, internal diameter 42mm, the position of gas concentration sensor 7 on gas pumping pipe 3 is apart from hell 18m;
(2) after gas concentration sensor 7 is connected with data signal line 8, with adhesive tape, gas concentration sensor 7 is strapped on gas pumping pipe 3 outer wall relevant position, the metal cylinder mould 4 that activated carbon block 5 is housed is put in gas pumping pipe 3, there is 3-5mm gap between metal cylinder mould 4 and gas pumping pipe 3 inwall, gas pumping pipe is entered for 3 times in sieve aperture 6;
(3) the sealing of hole section 12 of " two stifled notes " method of pore sealing shutoff one segment length 5-8m is adopted;
(4) data signal line 8 of gas concentration sensor 7 is connected with gauge tap 9, gauge tap 9 other end is connected with electromagnetic valve 10 by control signal wire, and console 1 can realize the automatic open-close of electromagnetic valve 10 by the variation ofgas density read on gas concentration sensor 7;
(5) open the gas pumping pump be connected on gas pumping pipe 3, carry out the operation of negative pressure mash gas extraction.
(6) when gas density in extraction borehole 11 lower than 16% time, gas concentration sensor 7 exports signal to console 1, the electromagnetic valve 10 that console 1 exports on electromagnetic signal control operation platform 2 cuts out, and the activated carbon block 5 now in metal cylinder mould 4 starts to adsorb the gas that a large amount of coal seam parses; When in extraction borehole 11, gas density is more than 30%, gas concentration sensor 7 exports signal to console 1, the electromagnetic valve 10 that console 1 exports on electromagnetic signal control operation platform 2 is opened, proceed negative pressure extraction, now activated carbon block 5 starts to resolve gas, and the gas that activated carbon block 5 is resolved by gas pumping pump is extracted out;
(7) repeat step (6), until the gas density in extraction borehole is lower than after 16% lasting 24-48h, after being less than 8m3/t to the gas pressure in coal seam lower than 0.74MPa and relative gas bearing capacity outburst amount after testing, closing extraction pump, complete extraction operation.
Gas concentration sensor 7 is at the setting position distance drilling orifice 15-20m of gas pumping pipe 3 outer wall.
" two stifled notes " method of pore sealing particular content in step (3) is: a certain amount of polyurethane A mixed of uniform application on first paragraph cotton strap, B expects, first paragraph cotton strap is wrapped in rapidly the inner of drainage tube and sealing of hole section, gas pumping pipe 3 is filled in boring fast, then with a certain amount of polyurethane A mixed of same uniform application, boring is filled in fast together with Grouting Pipe is wrapped in gas pumping pipe 3 by the second segment cotton strap that B expects, after treating second segment cotton strap expansion consolidation, in enclosure space, cement mortar is injected by reserved Grouting Pipe with grouting pump, slurry consolidation forms sealing of hole section later.
The present embodiment not does any pro forma restriction to shape of the present invention, material, structure etc.; every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (6)
1. one kind is improved the device of gas extraction concentration, it is characterized in that: comprise console, operating desk and gas pumping pipe, the part of gas pumping pipe in boring offers sieve aperture on tube wall, console and operating desk are all located on the gas pumping pipe outside boring, gas pumping pipe inside in boring is provided with several metal cylinder moulds along its length, metal cylinder mould inside is filled with activated carbon block, gas pumping pipe outer wall side is provided with gas concentration sensor, gas concentration sensor is connected with data signal line, the gauge tap that the sieve aperture of data signal line on drainage tube enters on gas pumping Guan Houyu console connects, operating desk is provided with the electromagnetic valve for folding gas pumping pipe, gauge tap is connected with electromagnetic valve by control signal wire.
2. a kind of device improving gas extraction concentration according to claim 1, it is characterized in that: metal cylinder mould is column structure, the diameter of metal cylinder mould is slightly less than the internal diameter of gas pumping pipe, the length of metal cylinder mould is equal with the single long length of gas pumping pipe, the mesh diameter of metal cylinder mould is 0.5-1cm, has the gap of 3-5mm between metal cylinder mould and gas pumping inside pipe wall.
3. a kind of device improving drilling gas extraction concentration according to claim 2, is characterized in that: the size dimension of activated carbon block is greater than the mesh size of metal cylinder mould.
4. a kind of method improving gas extraction concentration according to claim 3, is characterized in that: comprise the steps:
(1) comprehensive drillable length and coal seam physical property design following parameter: gas pumping length of tube, sealing of hole segment length, the position of gas concentration sensor on gas pumping pipe;
(2), after gas concentration sensor is connected with data signal line, with adhesive tape, gas concentration sensor is strapped on gas pumping pipe outer wall relevant position, the wire lath cage mounted that activated carbon block is housed is entered in gas pumping pipe, enters in sieve aperture by under gas pumping pipe;
(3) adopt " two stifled notes " method of pore sealing in the sealing of hole section of drilling orifice shutoff one segment length 5-8m;
(4) be connected with gauge tap by the data signal line of gas concentration sensor, the gauge tap other end is connected with electromagnetic valve by control signal wire, and console can realize the automatic open-close of electromagnetic valve by the variation ofgas density read on gas concentration sensor;
(5) open the gas pumping pump be connected on gas pumping pipe, carry out the operation of negative pressure mash gas extraction;
(6) when gas density in extraction borehole lower than 16% time, gas concentration sensor exports signal to console, console exports the closed electromagnetic valve on electromagnetic signal control operation platform, and the activated carbon block now in metal cylinder mould starts to adsorb the gas that a large amount of coal seam parses; When gas density in extraction borehole is more than 30%, gas concentration sensor exports signal to console, the electromagnetic valve that console exports on electromagnetic signal control operation platform is opened, proceed negative pressure extraction, now activated carbon block starts to resolve gas, and the gas that activated carbon block is resolved by gas pumping pump is extracted out;
(7) repeat step (6), until the gas density in extraction borehole is lower than after 16% lasting 24-48h, after being less than 8m3/t to the gas pressure in coal seam lower than 0.74MPa and relative gas bearing capacity outburst amount after testing, closing extraction pump, complete extraction operation.
5. a kind of method improving gas extraction concentration according to claim 4, is characterized in that: gas concentration sensor is at the setting position distance drilling orifice 15-20m of gas pumping pipe outer wall.
6. a kind of method improving gas extraction concentration according to claim 4 or 5, it is characterized in that: " two stifled notes " the method for pore sealing particular content in step (3) is: a certain amount of polyurethane A mixed of uniform application on first paragraph cotton strap, B expects, first paragraph cotton strap is wrapped in rapidly the inner of drainage tube and sealing of hole section, gas pumping pipe is filled in boring fast, then with a certain amount of polyurethane A mixed of same uniform application, boring is filled in fast together with Grouting Pipe is wrapped in gas pumping pipe by the second segment cotton strap that B expects, after treating second segment cotton strap expansion consolidation, in enclosure space, cement mortar is injected by reserved Grouting Pipe with grouting pump, slurry consolidation forms sealing of hole section later.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510601895.9A CN105201546B (en) | 2015-09-21 | 2015-09-21 | Device and method for improving gas extraction concentration |
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| CN201510601895.9A CN105201546B (en) | 2015-09-21 | 2015-09-21 | Device and method for improving gas extraction concentration |
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|---|---|---|---|---|
| CN108468850A (en) * | 2018-03-16 | 2018-08-31 | 田野 | The closed gas pumping control device of underground coal mine |
| CN110425002A (en) * | 2019-07-09 | 2019-11-08 | 中国矿业大学 | A kind of magnet controlled current-collecting device and its operating method improving gas extraction concentration |
| CN113216934A (en) * | 2021-05-17 | 2021-08-06 | 吕梁学院 | Coal seam gas content measuring device of directional drilling machine |
| CN113405603A (en) * | 2021-06-23 | 2021-09-17 | 中国地质大学（武汉） | Sliding body deep integrated sensor laying device and monitoring method |
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| CN110425002B (en) * | 2019-07-09 | 2020-06-19 | 中国矿业大学 | Magnetic control type flow collecting device for improving gas extraction concentration and operation method thereof |
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| CN113405603A (en) * | 2021-06-23 | 2021-09-17 | 中国地质大学（武汉） | Sliding body deep integrated sensor laying device and monitoring method |
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| Publication number | Publication date |
|---|---|
| CN105201546B (en) | 2017-05-17 |
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