CN112832847A - Multifunctional integrated gas bag device for blocking, extracting and releasing gas in goaf - Google Patents
Multifunctional integrated gas bag device for blocking, extracting and releasing gas in goaf Download PDFInfo
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 10
- 238000000605 extraction Methods 0.000 claims abstract description 80
- 239000010985 leather Substances 0.000 claims abstract description 24
- 239000003245 coal Substances 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 132
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- 238000000576 coating method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000002269 spontaneous effect Effects 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 9
- 238000005065 mining Methods 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 210000004712 air sac Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
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- 238000012552 review Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
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- 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
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- 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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention relates to a multifunctional integrated inflatable air bag device for blocking, extracting and releasing gas in a goaf, which comprises an air bag blocking system, a catheter drainage system, an air bag inflating and pressurizing system and a gas extraction and collection system; the air bag plugging system surrounds the outer side of the catheter drainage system and is connected with the catheter drainage system through a hoop; the catheter drainage system is connected with the air bag inflation pressurization system through an external leather hose at one end, namely the tail part, far away from the goaf; the gas extraction and collection system is connected with the tail part of the guide pipe drainage system through an external leather hose in front of the port. The invention leads the upper corner gas to be more effectively and stably treated and more accurately, effectively solves the problems of easy damage of pipe burying and pipe suspending extraction pipelines, low air tightness of drilling extraction and accumulation of the upper corner gas on a stope face, solves the problem of air leakage of a goaf to a certain extent, and provides good technical guarantee and safety measures for safely and efficiently mining coal resources.
Description
Technical Field
The invention relates to a multifunctional integrated inflatable air bag device for blocking, extracting and releasing gas in a goaf, and belongs to the technical field of coal mining.
Background
With the upgrading of national economic transformation and the deep adjustment of energy structures, large (super-large) coal mines occupy the main position in the coal production of China, and under the background of high-yield and high-efficiency mining of coal mines, the high-strength production activity of fully mechanized coal mining working faces causes the increase of residual coal in goafs, the gas emission quantity of the working faces is greatly increased, the gas concentration of upper corners is abnormally increased, and the problems of low gas occurrence and large gas emission quantity of mines form great threats to the life safety of underground workers.
The gas of the coal face mainly comes from the gas emission of the goaf and accounts for about 40-60% of the gas of the face. At present, the U-shaped ventilation system is mainly adopted in China, and the gas collected in the goaf is accumulated as the gas collected by the upper corner of the goaf due to the influence of air leakage, pressure diffusion and concentration diffusion. Therefore, the control of the gas in the goaf and the prevention of the gas accumulation at the upper corner are important for the prevention and control of the mine gas disasters. For gas extraction, not only is an important measure for reducing the gas emission quantity of a mine and preventing gas explosion and coal and gas outburst, but also the extracted gas can be changed into good harm and used as an associated resource of coal for development and utilization.
The technology for upper corner gas control in the current stage mainly comprises buried pipe extraction, suspended pipe extraction, high-position roadway extraction, mining high-position drill hole extraction, high-position directional drill hole extraction, goaf windbreak arrangement, upper corner arrangement of temporary windbreak curtain, filler plugging and the like. In the aspect of upper corner gas control, a large amount of research and application are carried out at home and abroad, and the problem of upper corner gas overrun in the aspect of gas extraction technology is rapidly developed. But the treatment effect is still insufficient at present, and gas accidents still occur occasionally, and simultaneously, the cost is higher, and the technology is complicated.
Through the review and summary of the current upper corner gas control technology, the following problems can be found:
(1) when the traditional technologies such as pipe burying, pipe hanging and the like are used for gas control, as the porosity in the goaf is high and the trend is prolonged, part of gas still can be transported to the upper corner along other pore paths, and the drainage efficiency is low.
(2) When the traditional technologies such as pipe burying, pipe suspending and the like are used for gas control, extraction pipelines are easily damaged due to collapse of a top plate and the like, or coal slime blocks cracks of a sieve pipe, the expected extraction requirements can not be met, upper corner gas accumulation is over-limited, and the stability is poor.
(3) When the technology such as drilling extraction is used for gas treatment, a large number of cracks are easily formed around an extraction drill hole due to the stress effect to form a gas transfer channel, so that the gas tightness of hole sealing is insufficient, the gas extraction effect is influenced, and the stability is poor.
(4) When the traditional gas extraction technology is used for treating gas in a goaf, the problem of air leakage in the goaf cannot be managed, and spontaneous combustion of coal is easy to occur.
(5) When the air curtain, the air barrier and the filler are used for treating the gas in the goaf, the gas cannot be extracted simultaneously, the function of preventing the gas from overflowing or plugging is only achieved, the resource waste is caused to a certain extent, and meanwhile, the gas still exists, and the problem that the gas is out of limit cannot be fundamentally solved.
Disclosure of Invention
The invention solves the problems: the defects of the prior art are overcome, the multifunctional integrated gas bag device for blocking, extracting and releasing gas in the goaf is provided, the upper corner gas treatment is more effective and stable and more accurate, the problems that a buried pipe and a suspension pipe extraction pipeline are easy to damage, the air tightness of drilling extraction is low, and the upper corner gas of a stope face is accumulated are effectively solved, the problem of air leakage of the goaf is solved to a certain extent, and good technical guarantee and safety measures are provided for safely and efficiently mining coal resources.
The technical scheme of the invention is as follows: a multifunctional integrated gas-filled airbag device for blocking, extracting and releasing pressure of gas in a goaf comprises an airbag blocking system (1), a catheter drainage system (2), an airbag inflating and pressurizing system (3) and a gas extraction and collection system (4); the air bag plugging system (1) surrounds the outer side of the catheter drainage system (2) and is connected with the catheter drainage system (2) through a hoop (8); the catheter drainage system (2) is connected with the air bag inflating and pressurizing system (3) through an external leather hose at one end, namely the tail part, far away from the goaf; the gas extraction and collection system (4) is connected through an external leather hose from the side in front of the port, namely the tail part of the catheter drainage system (2), and the airbag inflation and pressurization system (3) and the gas extraction and collection system (4) are installed in a safe area;
the air bag plugging system (1) comprises three air bags, namely an outer air bag, a middle air bag and an inner air bag;
the catheter drainage system (2) consists of an outer catheter (5), an inner catheter (6), a drawing baffle (7) and a hoop (8), wherein one end of the outer catheter (5) positioned in a goaf is in a closed state, the outer catheter (5) is sleeved outside the inner catheter (6), and the inner catheter (6) penetrates through the inner part of the outer catheter (5); the inner layer conduit (6) is positioned at one end of the goaf, namely the head part of the inner layer conduit passes through the outer layer conduit (5), and is led out from the front side of the tail part of the outer layer conduit (5) at one end far away from the goaf, namely the tail part of the inner layer conduit; the drawing baffle (7) is positioned between the outer layer conduit (5) and the inner layer conduit (6) and penetrates through the outer layer conduit (5) at a section far away from the goaf, namely the tail part; the cuffs (8) are three pairs, the outermost cuff (8) is fixed on the outer layer conduit (5), and the inner two pairs of cuffs (8) are adhered to the outer layer conduit (5) under normal pressure; the surface of the hoop is covered with a glue coating, and the outer layer conduit (5) is provided with three conduit holes (14); the drawing baffle (7) is provided with three baffle holes (15) which have the same area and unequal intervals with the guide pipe holes (14); when the conduit holes (14) are communicated with the baffle holes (15), an inflation hole group (16) is formed, the conduit holes at the outermost side and the baffle holes at the outermost side form a group, and so on, the inflation hole group (16) comprises three groups;
the air bag inflation pressurization system (3) consists of an air bottle (9), a flow meter (10) and an air supply valve (11); an air supply valve (11) is arranged at the mouth part of the air bottle (9); one end of the flow meter (10) is connected with the gas cylinder (9) through an external leather hose, and the other end of the flow meter (10) is connected with the outer layer conduit (5) through an external leather hose;
the gas extraction and collection system (4) consists of an extraction pump (12) and a collection chamber (13); one end of the extraction pump (12) is connected with the inner layer conduit (6) through an external leather hose, and the other end is connected with the gas collection chamber (13) through an external leather hose; the gas extraction pump (12) adjusts the extraction pressure to control the gas extraction speed, and the gas collection chamber (13) is used for collecting the extracted gas so as to be used subsequently;
the air bag plugging system (1) occupies a gap of the goaf through air bag expansion, plays a role in plugging gas overflow of the goaf and improves the extraction efficiency; the outer part of the drainage pipe is wound on the outer side of the catheter drainage system (2), so that the drainage pipeline is protected, and the drainage stability is improved; because the three layers of air bags are arranged, when the outer air bag is stressed to reach the threshold value and damaged, the coal rock collapses, and meanwhile, the inner air bag is inflated to fill the gap, so that the pressure relief effect is realized.
The air bag plugging system (1) is made of telescopic double-resistance coating cloth and is spherical after being inflated; before not using, the gasbag is in the gassing state, and the winding is outside pipe drainage system (2) after folding, is convenient for accomodate.
The catheter drainage system (2) is formed by processing a double-layer PVC pipe; wherein the outer layer catheter (5) is provided with three catheter holes (14) which respectively correspond to the three air bags; the catheter drainage system (2) aligns the baffle hole (15) with the catheter hole (14) by controlling the drawing baffle (7) to open and close different inflation hole groups (16), so that different air bags are inflated; when one of the air bags is inflated, the air bag inflation pressurization system enables the internal air pressure of the outer layer conduit (5) to be higher than the external air pressure, so that the drawing baffle is tightly attached to the inner side of the outer layer conduit, the gap between the drawing baffle and the outer layer conduit is reduced, and air leakage in the inflation process is avoided.
When the outer layer air bag is damaged and decompressed, the air bag inflating and pressurizing system starts to work, the inner side hoop is difficult to adhere to the outer layer conduit along with the increase of inflating pressure and gradually slides to two sides, the inner layer air bag expands along with the inner side hoop, and the air bag can be expanded to the fixed hoop at the outermost side at the maximum.
The gas bottle (9) in the gas bag inflating and pressurizing system (3) is filled with inert gas, so that the coal spontaneous combustion caused by gas leakage after the gas bag is damaged is avoided; after the inflation is finished, the inflation port of the outer layer conduit (5) is plugged by an air plug.
The device can control the size of the inflatable air bag to adapt to different goaf gap characteristics, and plays a role in blocking gas overflow of the goaf and improving extraction efficiency; when the outer inflatable air bag is damaged and depressurized, the inner inflatable air bag is inflated and pressurized by sliding the drawing baffle (7) to supplement the gap of the goaf.
Compared with the prior art, the invention has the advantages that:
(1) when the air curtain, the air barrier and the filler are used for treating the gas in the goaf, the gas cannot be extracted simultaneously, the function of preventing the gas from overflowing or plugging is only achieved, the resource waste is caused to a certain extent, and meanwhile, the gas still exists, and the problem that the gas is out of limit cannot be fundamentally solved. The device has three functions of goaf gas plugging, gas extraction and pressure relief, and integrates the three functions into a whole.
(2) The device considers the air bag pressure relief way, when the outer air bag is damaged and pressure is relieved due to coal rock collapse, deformation and the like in the goaf, the inner air bag is continuously inflated and pressurized to block gaps of the goaf by adjusting the baffle, and compared with the traditional extraction technology, the damage rate of an extraction pipeline is reduced.
(3) When the traditional technologies such as pipe burying, pipe hanging and the like are used for gas control, as the porosity in the goaf is high and the trend is prolonged, part of gas still can be transported to the upper corner along other pore paths, and the drainage efficiency is low. The invention adopts the integrated air bag to fill in the gap of the goaf, extracts the gas in the goaf through the guide pipe, fills the gap of the goaf, plugs the overflow path of the gas to the working face to the maximum extent, improves the extraction efficiency, effectively solves the problem of gas accumulation at the upper corner of the stoping working face, and effectively inhibits the air leakage of the goaf.
(4) When the traditional technologies such as pipe burying, pipe suspending and the like are used for gas control, extraction pipelines are easily damaged due to collapse of a top plate and the like, or coal slime coal slag blocks cracks of a sieve pipe, the expected extraction requirements may not be met, and the stability is poor. The gas extraction pipeline and the gas pipeline are wrapped by the gas-filled bag designed by the invention, so that the pressure and deformation from the outside are buffered, and the possibility of damage or blockage of the gas extraction device is reduced. When the outer layer inflatable bag reaches the pressure limit and is damaged and depressurized, the inner layer inflatable bag can be quickly pressurized, expanded and filled in the gap by adjusting the opening and closing of the baffle plate, so that the continuation and the stability of gas treatment work are ensured, and the damage rate of an extraction pipeline is reduced to a certain extent.
(5) According to the air bag plugging system, the air bag is wrapped on the outer side of the catheter drainage system, so that the air bag plays a role in protecting the extraction pipeline, the damage rate of the extraction pipeline is reduced, and the extraction efficiency is improved.
Drawings
FIG. 1 is a view showing an operation state of an inflatable air bag according to the present invention before use;
FIG. 2 is a view showing the operation of the inflatable air bag of the present invention in a non-compressed condition after use;
FIG. 3 is a view showing an inflated and pressurized state of the outer bag of the inflatable air bag according to the present invention after breakage;
FIG. 4 is a view showing a stable state after breakage of an outer bag of the inflatable airbag of the present invention;
FIG. 5 illustrates the operation of the catheter drainage system of the present invention;
FIG. 6 is a schematic view of the apparatus of the present invention.
Wherein: 1-an air bag plugging system, 2-a conduit drainage system, 3-an air bag inflation pressurization system, 4-a gas extraction and collection system, 5-an outer conduit, 6-an inner conduit, 7-a drawing baffle, 8-a hoop, 9-a gas bottle, 10-a flow meter, 11-a gas supply valve, 12-an extraction pump, 13-a gas collection chamber, 14-a conduit hole, 15-a baffle hole and 16-an inflation hole group.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1-6, the device comprises components of an air bag plugging system 1, a catheter drainage system 2, an air bag inflation pressurization system 3 and a gas extraction and collection system 4; the air bag plugging system 1 surrounds the outer side of the catheter drainage system 2 and is connected with the catheter drainage system 2 through a hoop 8; the catheter drainage system 2 is connected with the air bag inflation pressurization system 3 through an external leather hose at one end, namely the tail part, far away from the goaf; the gas extraction and collection system 4 is connected with the tail part of the guide pipe drainage system 2 from the side through an external leather hose.
As shown in fig. 1 and 6, the air bag plugging system 1 is made of telescopic double-resistance coating cloth and takes a spherical shape after being inflated. The balloon occlusion system 1 is wrapped around the outside of the catheter drainage system 2. The catheter drainage system 2 is formed by processing a double-layer PVC pipe; the air bag material used by the air bag plugging system 1 is in a deflation state before being used, and can be folded and wound on the outer side of the catheter drainage system 2, so that the air bag plugging system is convenient to store.
As shown in fig. 2, the catheter drainage system 2 comprises an outer catheter 5, an inner catheter 6, a drawing baffle 7 and a hoop 8, wherein the outer catheter 5 is sleeved outside the inner catheter 6, and the inner catheter 6 penetrates through the inner part of the outer catheter 5; the inner layer conduit 6 is positioned at one end of the goaf, namely the head part of the inner layer conduit passes through the outer layer conduit 5, and is led out from the front side of the tail part of the outer layer conduit 5 at one end far away from the goaf, namely the tail part of the inner layer conduit; the drawing baffle 7 is positioned between the outer layer conduit 5 and the inner layer conduit 6 and penetrates through the outer layer conduit 5 at a section far away from the goaf, namely the tail part; the cuffs 8 are three pairs, the outermost pair of cuffs 8 is fixed on the outer-layer conduit 5, and the inner two pairs of cuffs 8 are adhered to the outer-layer conduit 5; the hoops 8 are in three pairs, and the surface of each hoop 8 is coated with a glue coating. The outer layer conduit 5 is provided with three conduit holes 14; three baffle holes 15 with the same area and unequal intervals as the guide pipe holes 14 are arranged on the drawing baffle 7, when the guide pipe holes 14 are communicated with the baffle holes 15, an inflation hole group 16 is formed, the guide pipe holes on the outermost side and the baffle holes on the outermost side form a group, and so on, the inflation hole group 16 comprises three groups;
the air bag inflating and pressurizing system 3 consists of an air bottle 9, a flowmeter 10, an air supply valve 11 and an external leather hose; the air bag inflation pressurization system 3 is installed in a safe area, and an air supply valve 11 is installed at the mouth of the air bottle 9; one end of the flowmeter 10 is connected with the gas cylinder 9 through an external leather hose, and the other end is connected with the outer layer conduit 5 through an external leather hose;
the gas extraction and collection system 4 consists of an extraction pump 12, a collection chamber 13 and an external leather hose. The gas extraction and collection system 4 is installed in a safe area, one end of an extraction pump 12 is connected with the inner layer conduit 6 through an external leather hose, and the other end of the extraction pump is connected with the collection chamber 13 through an external leather hose.
One end of the outer layer conduit 5 positioned in the goaf is in a closed state, and the outer layer conduit 5 in the air bag is provided with three conduit holes 14 which respectively correspond to the three air bags and are used for inflating the air bags; one end of the inner layer conduit 6 positioned in the goaf penetrates through the outer layer conduit 5, and the end part is in an open state and is used for extracting gas in the goaf.
The catheter drainage system 2 aligns the baffle hole 15 with the catheter hole 14 by controlling the drawing baffle 7, and carries out opening and closing of the inflation hole groups 16 at different positions to inflate different air bags; when one of the air bags is inflated, the air bag pressurizing system 3 enables the internal air pressure of the outer layer conduit 5 to be higher than the external air pressure, so that the drawing baffle is tightly attached to the inner side of the outer layer conduit, the holes at other positions are sealed, and air leakage of the pressurizing system is avoided.
The pipe drainage system 2 is arranged at one end far away from the goaf, the inner layer pipe 6 is led out from the side in front of the port of the outer layer pipe 5, and meanwhile, the inflation and extraction operation is carried out.
The gas cylinder 9 in the gas bag inflating and pressurizing system 3 is filled with inert gases such as nitrogen and the like, so that the spontaneous combustion of coal caused by gas leakage after the gas bag is damaged is avoided, and an external leather hose is connected with the gas cylinder 9 and the port of the outer layer conduit 5; after the inflation is finished, the inflation port of the outer layer conduit 5 is plugged by an air plug.
An extraction pump 12 in the gas extraction and collection system 4 controls the gas extraction speed by adjusting the extraction pressure, an external leather hose is connected with the port of the inner layer conduit 6 and the extraction pump 12, and a gas collection chamber 13 is used for collecting extracted gas for subsequent utilization.
The outer layer conduit 5 is respectively contacted with the three inflatable air bags through three pairs of cuffs 8, namely the cuffs and the air bags are integrated; the outside hoop is a fixed and immovable hoop, and the two pairs of inside hoops are adhered to the outer-layer conduit 5 under normal pressure; when the outer layer air bag is damaged and decompressed, the air bag inflating and pressurizing system starts to work, the inner side hoop is difficult to adhere to the outer layer conduit along with the increase of inflating pressure and gradually slides to two sides, the inner layer air bag expands along with the inner side hoop, and the air bag can be expanded to the fixed hoop at the outermost side at the maximum.
As shown in figure 1, the air sac is in a deflation state before use, and can be folded and wound on the outer side of the catheter drainage system for convenient storage.
As shown in fig. 2, the air bag is stable in the working state to the ideal working state without squeezing. The drawing baffle 7 is controlled to be communicated with the guide pipe hole 14 and the baffle hole 15 on the outermost side to form an outer side inflation hole group 16, and inflation is carried out according to the inflation route shown in the figure, so that the air bag plugging system 1 is expanded to fill the gap of the goaf and protect the outer-layer guide pipe 5 and the inner-layer guide pipe 6.
As shown in fig. 3, the outer bag of the inflatable bag is in an inflated and pressurized state after the breakage of the outer bag. After the outer layer air bag of the air bag plugging system 1 is damaged, the position of the drawing baffle 7 is adjusted to enable the inner side conduit hole 14 to be communicated with the baffle hole 15 to form an inflation hole group 16, so that the inner layer air bag is rapidly inflated and pressurized, and is inflated according to the inflation route shown in the figure to fill gaps of a goaf and protect pipelines.
As shown in FIG. 4, the outer layer of the inflatable airbag of the invention is in a stable state without compression in an ideal state after the airbag is broken. After the outer layer air bag of the air bag plugging system 1 is damaged, in the inflating process according to the inflating route shown in the figure, the inner side cuff is difficult to adhere to the outer layer conduit and gradually slides to two sides, the inner layer air bag expands along with the outer layer air bag, and the air bag can be expanded to the fixed cuff 8 at the outermost side at the maximum.
As shown in fig. 5 and 6, the dynamic working process of the device of the present invention is as follows: when gas extraction is carried out, the guide pipe drainage system 2 is extended into a goaf. The air bag inflation pressurization system 3 and the gas extraction gas collection system 4 can start to work simultaneously, firstly, the outermost air bag is inflated, the guide pipe holes 14 and the baffle holes 15 on the outermost side are communicated to form an inflation hole group 16, the gas supply valve 11 is opened, the air is inflated along the inflation route shown in figure 2, the extraction pump 12 is opened, after the working state is stable, the air bag is inflated until the maximum goaf gap is filled, the gas supply valve 11 is closed, and the inflation port of the outer guide pipe 5 is plugged by a gas plug. In the operation flow, the air bag inflation pressurization system 3 is controlled to work and stop through the air supply valve 11, and the gas extraction gas collection system 4 is controlled to work and stop through the extraction pump 12. The baffle hole 15 is aligned with the guide pipe hole 14 by controlling the movement of the drawing baffle 7 at a section far away from the goaf, and the inflation hole group 16 is opened and closed at different positions, so that different air bags are inflated, and when the outer air bag is damaged, the inner air bag can be pressurized and inflated. When the air bag is inflated, the air bag inflating and pressurizing system 3 enables the internal air pressure of the outer layer conduit 5 to be higher than the external air, the drawing baffle is made to be tightly attached to the inner side of the outer layer conduit, the gap between the drawing baffle and the outer layer conduit is reduced, and air leakage in the inflating process is avoided. On one hand, the air bag plugging system 1 effectively protects the extraction pipeline from being damaged; on the other hand, the inert gas such as nitrogen gas leaked after the breakage of the airbag also plays a role of suppressing spontaneous combustion of coal.
When the outer layer air bag is damaged and decompressed, the inner side guide pipe hole 14 and the baffle hole 15 can be communicated by sliding the drawing baffle 7 to form an inner side inflation hole group 16, and the inner layer air bag is inflated and pressurized to supplement the gap of the goaf. When the air supply valve 11 is opened, the air bag inflating and pressurizing system 3 starts to work, the air bag inflates along the inflating route shown in figure 3, the inner side hoop is difficult to adhere to the outer layer guide pipe along with the increase of the inflating pressure, the inner side hoop slides towards two sides gradually, the inner side air bag expands along with the inner side hoop, and the air bag can expand to the fixed hoop at the outermost side at the maximum, as shown in figure 4. After the working state is stable and the air bag expands to fill the maximum goaf gap, the air supply valve 11 is closed, and the inflation port of the outer layer conduit 5 is plugged by an air plug. The device can buffer the pressure and deformation from the outside, reduces the possibility of damage or blockage of the gas extraction device, ensures the continuity and stability of gas treatment work, and reduces the damage rate of the device pipeline to a certain extent.
The device can control the size of the air bag to adapt to different goaf gap characteristics, and when the outer air bag is damaged and depressurized, the inner air bag is inflated and pressurized by sliding the drawing baffle 7 to supplement the goaf gap.
The above examples are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Various equivalent substitutions and modifications can be made without departing from the spirit and principles of the invention, and are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a multi-functional integral type air bag device is aerifyd in goaf gas shutoff is taken out and is adopted and release pressure which characterized in that: comprises an air bag plugging system (1), a catheter drainage system (2), an air bag inflating and pressurizing system (3) and a gas extraction and collection system (4); the air bag plugging system (1) surrounds the outer side of the catheter drainage system (2) and is connected with the catheter drainage system (2) through a hoop (8); the catheter drainage system (2) is connected with the air bag inflating and pressurizing system (3) through an external leather hose at one end, namely the tail part, far away from the goaf; the gas extraction and collection system (4) is connected through an external leather hose from the side in front of the port, namely the tail part of the catheter drainage system (2), and the airbag inflation and pressurization system (3) and the gas extraction and collection system (4) are installed in a safe area;
the air bag plugging system (1) comprises three air bags, namely an outer air bag, a middle air bag and an inner air bag;
the catheter drainage system (2) consists of an outer catheter (5), an inner catheter (6), a drawing baffle (7) and a hoop (8), wherein one end of the outer catheter (5) positioned in a goaf is in a closed state, the outer catheter (5) is sleeved outside the inner catheter (6), and the inner catheter (6) penetrates through the inner part of the outer catheter (5); the inner layer conduit (6) is positioned at one end of the goaf, namely the head part of the inner layer conduit passes through the outer layer conduit (5), and is led out from the front side of the tail part of the outer layer conduit (5) at one end far away from the goaf, namely the tail part of the inner layer conduit; the drawing baffle (7) is positioned between the outer layer conduit (5) and the inner layer conduit (6) and penetrates through the outer layer conduit (5) at a section far away from the goaf, namely the tail part; the cuffs (8) are three pairs, the outermost cuff (8) is fixed on the outer layer conduit (5), and the inner two pairs of cuffs (8) are adhered to the outer layer conduit (5) under normal pressure; the surface of the hoop is covered with a glue coating, and the outer layer conduit (5) is provided with three conduit holes (14); the drawing baffle (7) is provided with three baffle holes (15) which have the same area and unequal intervals with the guide pipe holes (14); when the conduit holes (14) are communicated with the baffle holes (15), an inflation hole group (16) is formed, the conduit holes at the outermost side and the baffle holes at the outermost side form a group, and so on, the inflation hole group (16) comprises three groups;
the air bag inflation pressurization system (3) consists of an air bottle (9), a flow meter (10) and an air supply valve (11); an air supply valve (11) is arranged at the mouth part of the air bottle (9); one end of the flow meter (10) is connected with the gas cylinder (9) through an external leather hose, and the other end of the flow meter (10) is connected with the outer layer conduit (5) through an external leather hose;
the gas extraction and collection system (4) consists of an extraction pump (12) and a collection chamber (13); one end of the extraction pump (12) is connected with the inner layer conduit (6) through an external leather hose, and the other end is connected with the gas collection chamber (13) through an external leather hose; the gas extraction pump (12) adjusts the extraction pressure to control the gas extraction speed, and the gas collection chamber (13) is used for collecting the extracted gas so as to be used subsequently;
the air bag plugging system (1) occupies a gap of the goaf through air bag expansion, plays a role in plugging gas overflow of the goaf and improves the extraction efficiency; the outer part of the drainage pipe is wound on the outer side of the catheter drainage system (2), so that the drainage pipeline is protected, and the drainage stability is improved; because the three layers of air bags are arranged, when the outer air bag is stressed to reach the threshold value and damaged, the coal rock collapses, and meanwhile, the inner air bag is inflated to fill the gap, so that the pressure relief effect is realized.
2. The goaf gas plugging, extraction and pressure relief multifunctional integrated inflatable air bag device according to claim 1, characterized in that: the air bag plugging system (1) is made of telescopic double-resistance coating cloth and is spherical after being inflated; before not using, the gasbag is in the gassing state, and the winding is outside pipe drainage system (2) after folding, is convenient for accomodate.
3. The goaf gas plugging extraction and pressure relief multifunctional integrated inflatable air bag device according to claim 1, characterized in that: the catheter drainage system (2) is formed by processing a double-layer PVC pipe; wherein the outer layer catheter (5) is provided with three catheter holes (14) which respectively correspond to the three air bags; the catheter drainage system (2) aligns the baffle hole (15) with the catheter hole (14) by controlling the drawing baffle (7) to open and close different inflation hole groups (16), so that different air bags are inflated; when one of the air bags is inflated, the air bag inflation pressurization system enables the internal air pressure of the outer layer conduit (5) to be higher than the external air pressure, so that the drawing baffle is tightly attached to the inner side of the outer layer conduit, the gap between the drawing baffle and the outer layer conduit is reduced, and air leakage in the inflation process is avoided.
4. The goaf gas plugging, extraction and pressure relief multifunctional integrated inflatable air bag device according to claim 1, characterized in that: when the outer layer air bag is damaged and decompressed, the air bag inflating and pressurizing system starts to work, the inner side hoop is difficult to adhere to the outer layer conduit along with the increase of inflating pressure and gradually slides to two sides, the inner layer air bag expands along with the inner side hoop, and the air bag can be expanded to the fixed hoop at the outermost side at the maximum.
5. The goaf gas plugging, extraction and pressure relief multifunctional integrated inflatable air bag device according to claim 1, characterized in that: the gas bottle (9) in the gas bag inflating and pressurizing system (3) is filled with inert gas, so that the coal spontaneous combustion caused by gas leakage after the gas bag is damaged is avoided; after the inflation is finished, the inflation port of the outer layer conduit (5) is plugged by an air plug.
6. The goaf gas plugging, extraction and pressure relief multifunctional integrated inflatable air bag device according to claim 1, characterized in that: the device can control the size of the inflatable air bag to adapt to different goaf gap characteristics, and plays a role in blocking gas overflow of the goaf and improving extraction efficiency; when the outer inflatable air bag is damaged and depressurized, the inner inflatable air bag is inflated and pressurized by sliding the drawing baffle (7) to supplement the gap of the goaf.
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