CN110566265A - Coal mine underground gas circulating pumping and draining system - Google Patents

Coal mine underground gas circulating pumping and draining system Download PDF

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Publication number
CN110566265A
CN110566265A CN201910893500.5A CN201910893500A CN110566265A CN 110566265 A CN110566265 A CN 110566265A CN 201910893500 A CN201910893500 A CN 201910893500A CN 110566265 A CN110566265 A CN 110566265A
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China
Prior art keywords
exhaust
air
pipe
air inlet
mine
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CN201910893500.5A
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Chinese (zh)
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CN110566265B (en
Inventor
贾炳
万祥云
黄战峰
田好敏
王洪义
娄全
曹树蒙
王宇航
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Henan University of Urban Construction
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Henan University of Urban Construction
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20Combinations of devices covered by groups B01D45/00 and B01D46/00
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/16Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/166Combinations of two or more pumps ; Producing two or more separate gas flows using fans

Abstract

The invention discloses a coal mine underground gas circulating pumping system which comprises an exhaust pipe fixedly inserted in an earth and rockfill layer and extending into a mine, wherein an air inlet pipe is fixedly inserted in the exhaust pipe, and one end of the exhaust pipe positioned in the mine is symmetrically inserted and communicated with two exhaust branch pipes. The invention provides air circulation power through the exhaust fan and the blower, is positioned on the ground outside a mine, is convenient to maintain, cannot influence the interior of the mine when a fault occurs, and the like, forms circulation airflow in the mine through the exhaust pipe, the exhaust branch pipe, the air inlet pipe and the air inlet branch pipe, increases the exhaust speed of gas, forms circulation airflow in each area through the air inlet mechanism, the air suction mechanism and the air pipe, further enhances the exhaust speed of the gas, reduces the possibility of carbon monoxide poisoning of constructors due to the air inlet height of the air inlet mechanism, and filters impurities in the gas through the dust filter box to avoid blocking pipelines and the exhaust fan.

Description

coal mine underground gas circulating pumping and draining system
Technical Field
The invention relates to the field of coal mining safety, in particular to a coal mine underground gas circulating pumping system.
Background
The mine needs to be opened underground in coal mining, when the coal mine is mined in the mine, gas can penetrate through a coal mine layer to enter the mine, the gas contains carbon monoxide gas and is toxic, life threat to mining personnel is easy to cause, and the methane and the like in the gas are easy to combust and explode after the concentration reaches a certain degree, so that mine mining accidents are caused, therefore, in the coal mining process, the gas in the mine needs to be pumped and discharged, and the concentration of the internal gas is prevented from rising.
In the patent document with the patent application number of 201811484832.X, "a coal mine underground gas fire-proof rapid pumping and discharging device" is proposed, which comprises an air inlet pipe and a pumping and discharging pipe, wherein an air inlet machine is arranged on the inner side of the air inlet pipe, a first movable wind shield is arranged at the rear end of the air inlet pipe, a dust falling bin is arranged at the tail end of the air inlet pipe, a second movable wind shield is arranged on the outer side of an air pumping hole, a spray pipe is arranged on the inner side of the dust falling bin, a water return pipe is arranged below the dust falling bin, and the pumping and discharging pipe is arranged at the rear end of the dust falling bin. The side wall of the dust falling bin is provided with a water pump which is driven by electric power, the electric power driven equipment is easy to generate motor faults, short circuits and the like when used under severe conditions in a long-term mine, and the temperature of the motor of the water pump is suddenly increased due to the fact that the motor is burnt by large current caused by the short circuit, gas is easy to ignite and explode, so that the increase of electrical equipment in the mine is avoided as far as possible when the gas is pumped and discharged.
disclosure of Invention
The invention aims to solve the defects that in the prior art, power equipment such as a water pump and a motor needs to be placed at a gas extraction point, and the fault of the power equipment is easy to cause explosion and increase danger, and provides a coal mine underground gas circulation pumping and draining system.
In order to achieve the purpose, the invention adopts the following technical scheme:
A coal mine underground gas circulation pumping and discharging system comprises an exhaust pipe which is fixedly inserted in an earth and rockfill layer and extends into a mine, wherein an exhaust fan and an air blower are fixedly installed above the earth and rockfill layer, the exhaust pipe is fixedly connected to the exhaust fan, an air inlet pipe is fixedly inserted in the exhaust pipe, the upper end of the air inlet pipe penetrates through the side wall of the exhaust pipe and is connected to the air blower, one end, located in the mine, of the exhaust pipe is symmetrically inserted and communicated with two exhaust branch pipes, one end, located in the mine, of the air inlet pipe is symmetrically inserted and communicated with two air inlet branch pipes, the two air inlet branch pipes are respectively located in the two exhaust branch pipes, a plurality of fixing sleeves are fixedly sleeved on the two exhaust branch pipes, and the fixing sleeves are fixed on;
Install a plurality of dirt box fixed establishment, every jointly between exhaust branch and the branch pipe that admits air all insert on the branch pipe that admits air and establish the intercommunication and have a plurality of air hoses, and the equal vertical exhaust branch that passes downwards of every air hose is located the pit, every it inhales the mechanism, every all to install jointly between air hose and the exhaust branch all the mechanism that admits air is installed to the lower extreme of air hose, the lower extreme fixed mounting that the blast pipe is located the pit has the dust collecting pipe, the lower extreme screw thread of dust collecting pipe is installed out the dirt stopper, can make the dust impurity in the gas fall into in the dust collecting pipe promptly, accomplishes dust impurity's collection processing.
preferably, the dust filtering box fixing mechanism comprises an arc-shaped clamping groove formed in the exhaust branch pipe and a connecting plate fixedly installed on the exhaust branch pipe, the dust filtering box is installed in the arc-shaped clamping groove in a sliding mode, an installation groove is formed in the dust filtering box, the installation groove is sleeved on the air inlet branch pipe and the connecting plate in a sliding mode, sealing rubber strips are symmetrically installed on the side face of the dust filtering box, and therefore negative pressure in the exhaust branch pipe is stable;
Through the operation of exhaust fan, then the exhaust fan produces negative pressure suction in the exhaust pipe, then all produces negative pressure suction in two exhaust branch pipes, is convenient for absorb the gas in the mine, and contains impurity such as dust in the gas of inhaling, is adsorbed when straining the dirt box through in the exhaust branch pipe, and a plurality of dirt box one-tenth multiple filtration, and strain the dirt box and can directly slide and pull down the washing, facilitate the use.
preferably, the suction mechanism includes that the intercommunication is installed the toper exhaust kuppe on the exhaust branch lateral wall, the lower extreme of air pipe extends to in the toper exhaust kuppe and fixed cover is equipped with toper exhaust guide plate, forms circular air inlet between toper exhaust kuppe and the toper exhaust guide plate, can make gas all around inhale along the space between toper exhaust kuppe and the toper exhaust guide plate, and the density of gas is less than air density, then gas is located the air upper strata, has increased the absorptive speed of upper gas.
Preferably, the mounting height of the air inlet mechanism is 1.5m-2.0m away from the bottom surface of a mine, the air inlet mechanism comprises a conical air inlet diffusion cover fixedly mounted at the lower end of an air pipe, a plurality of connecting pieces are fixedly mounted at the lower end of the conical air inlet diffusion cover, an arc-shaped diffusion plate is fixedly mounted at the lower ends of the connecting pieces jointly, an air blower blows outside air into the two air inlet branch pipes through air inlet pipes, the air in the two air inlet branch pipes is discharged onto the arc-shaped diffusion plate through the air pipe, the air collides with the arc-shaped diffusion plate to diffuse the air all around, and the air moves downwards in the mine due to the fact that the air density is smaller than that of gas, the height of the air inlet mechanism is about the height of a common worker and the height of bending work, namely, the worker can be guaranteed to breathe fresh air.
The invention has the following beneficial effects:
1. Two electrical equipment of exhaust fan and air-blower all set up outside the mine, even break down also can not produce the safety influence in the mine in the use, and arrange exhaust fan and air-blower outside the mine in and more make things convenient for maintenance personal to overhaul.
2. the exhaust pipe is inserted into the mine from the ground above the earth stone layer, and the exhaust pipe is communicated with the exhaust pipe by fixing the two exhaust branch pipes on the top wall of the mine along the direction of the mine, so that the exhaust fan can extract gas in the mine through the exhaust pipe and the exhaust branch pipes, and the concentration of the gas is reduced.
3. The air suction mechanism is positioned on the upper layer of the mine, and under the same condition, the density of the gas is smaller than that of the air, so that the gas is positioned above the air, and the gap formed by the conical exhaust guide cover and the conical exhaust guide plate can absorb the gas from the peripheral horizontal direction on the upper layer of the mine, thereby increasing the speed of exhausting the gas.
4. the air inlet mechanism is located 1.5m-2.0m away from the bottom of the mine in the mine, pressure air blown out by the air blower is enabled to impact the arc-shaped diffusion plate to be diffused all around through the conical air inlet diffusion cover and the arc-shaped diffusion plate, the diffusion height is the height of a constructor or the working height of bending down, the constructor can conveniently breathe fresh air, and the possibility of carbon monoxide poisoning is reduced.
5. the gas inlet mechanism is located below the gas suction mechanism, so that gas pressure of the gas inlet mechanism is increased in the mine, the gas suction mechanism absorbs gas above the interior of the mine to form negative pressure, flowing circulation of the gas is formed, the gas in the upper layer is quickly discharged, and the gas in the mine is replaced by fresh air.
6. strain the dirt box and set up between exhaust branch and inlet branch, exhaust branch is when absorbing the gas of upper strata in the mine through the suction mechanism, can inhale the dust impurity in the mine in the lump, the gas who thoughtlessly has dust impurity flows in exhaust branch and filters dust impurity through filtering the dirt box, and a plurality of dirt box one-tenth multi-stage filtration, further reduce the impurity content in the exhaust gas, make it can not cause the influence to the exhaust fan, and dirt box accessible plug is changed and is washd, the convenience that dirt box used has been increased.
7. The dust collecting pipe sets up under the blast pipe, and some in a small amount of unfiltered dust impurity falls into the dust collecting pipe by the blast pipe under the effect of gravity, can carry out the deashing, simple operation to it through opening out the dirt stopper.
8. The intake pipe is located the exhaust pipe, air intake branch is located the exhaust branch, the space that the pipeline occupy the mine has been reduced, reduce the influence degree to the interior construction of mine promptly, and can set up suction mechanism and air inlet mechanism in same vertical region through the connection of air hose, form independent intake circulation of breathing in each region promptly, increase the gaseous exhaust speed of gas, reduce the gaseous concentration of gas fast, and can use for a long time and make the air circumstance in the mine more be fit for constructor work personnel work
In conclusion, the air circulation power is provided by the exhaust fan and the blower, the exhaust fan and the blower are both positioned on the ground outside the mine, the maintenance is convenient, the fault and the like do not influence the interior of the mine, the circulating airflow is formed in the mine through the exhaust pipe, the exhaust branch pipe, the air inlet pipe and the air inlet branch pipe, the gas exhaust speed is increased, the circulating airflow is formed in each area through the air inlet mechanism, the air suction mechanism and the air pipe, the gas exhaust speed is further increased, the possibility of carbon monoxide poisoning of constructors is reduced due to the air inlet height of the air inlet mechanism, and the dust filter box is used for filtering impurities in the gas, so that pipelines and the exhaust fan are prevented from being blocked.
drawings
FIG. 1 is a schematic structural diagram of a coal mine underground gas circulation pumping system according to the present invention;
FIG. 2 is a partially enlarged view of a dust filter box fixing mechanism of the coal mine underground gas circulating pumping system according to the present invention;
FIG. 3 is an enlarged view of a dust filtering box of the coal mine underground gas circulating and pumping system according to the present invention;
FIG. 4 is an enlarged view of a part of an air suction mechanism of the coal mine underground gas circulation pumping system provided by the invention;
FIG. 5 is a partially enlarged view of an air intake mechanism of the coal mine underground gas circulation pumping system provided by the invention.
in the figure: 1 mine, 2 terrane layers, 3 blowers, 4 air inlet pipes, 5 exhaust pipes, 6 exhaust fans, 7 air inlet branch pipes, 8 air suction mechanisms, 9 air inlet mechanisms, 10 exhaust branch pipes, 11 dust collecting pipes, 12 dust outlet plugs, 13 dust filtering box fixing mechanisms, 14 air pipes, 15 fixing sleeves, 801 conical exhaust guide covers, 802 conical exhaust guide plates, 901 conical air inlet diffusion covers, 902 connecting plates, 903 arc-shaped diffusion plates, 1301 connecting plates, 1302 dust filtering boxes and 1303 installation grooves.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a circular gas pumping system for a coal mine comprises an exhaust pipe 5 fixedly inserted in an earth stone layer 2 and extending into a mine 1, an exhaust fan 6 and an air blower 3 are fixedly installed above the earth stone layer 2, the exhaust pipe 5 is fixedly connected to the exhaust fan 6, an air inlet pipe 4 is fixedly inserted in the exhaust pipe 5, the upper end of the air inlet pipe 4 penetrates through the side wall of the exhaust pipe 5 and is connected to the air blower 3, two exhaust branch pipes 10 are symmetrically inserted and communicated at one end of the exhaust pipe 5 located in the mine 1, two air inlet branch pipes 7 are symmetrically inserted and communicated at one end of the air inlet pipe 4 located in the mine 1, the two air inlet branch pipes 7 are respectively located in the two exhaust branch pipes 10, a plurality of fixing sleeves 15 are fixedly sleeved on the two exhaust branch pipes 10, and the plurality of fixing sleeves 15 are fixed on the inner top wall;
install a plurality of dust filter box fixed establishment 13 between exhaust branch pipe 10 and the air intake branch pipe 7 jointly, it has a plurality of air hoses 14 all to insert and establish the intercommunication on every air intake branch pipe 7, and every air hose 14 is equal vertical to pass exhaust branch pipe 10 downwards and is located mine 1, all install air suction mechanism 8 jointly between every air hose 14 and the exhaust branch pipe 10, air inlet mechanism 9 is all installed to the lower extreme of every air hose 14, the lower extreme fixed mounting that blast pipe 5 is located mine 1 has dust collecting pipe 11, dust plug 12 is installed to the lower extreme screw thread of dust collecting pipe 11, can make in the dust impurity collecting pipe 11 in the gas promptly, accomplish the collection processing of dust impurity.
The dust filtering box fixing mechanism 13 comprises an arc-shaped clamping groove formed in the exhaust branch pipe 10 and a connecting plate 1301 fixedly installed on the exhaust branch pipe 10, a dust filtering box 1302 is installed in the arc-shaped clamping groove in a sliding mode, an installation groove 1303 is formed in the dust filtering box 1302, the installation groove 1303 is slidably sleeved on the air inlet branch pipe 7 and the connecting plate 1301, and sealing rubber strips are symmetrically installed on the side face of the dust filtering box 1302, so that negative pressure in the exhaust branch pipe 10 is stable;
Through the operation of exhaust fan 6, then exhaust fan 6 produces negative pressure suction in blast pipe 5, then all produces negative pressure suction in two exhaust branch pipes 10, is convenient for absorb the gas in mine 1, and contains impurity such as dust in the gas of inhaling, is adsorbed when passing through the dust filter box 1302 in exhaust branch pipe 10, and a plurality of dust filter boxes 1302 form multistage filtration, and dust filter box 1302 can directly slide and pull down the washing, facilitates the use.
The air suction mechanism 8 comprises a conical exhaust guide cover 801 communicated with and installed on the outer side wall of the exhaust branch pipe 10, the lower end of the air pipe 14 extends into the conical exhaust guide cover 801 and is fixedly sleeved with a conical exhaust guide plate 802, a circular air inlet is formed between the conical exhaust guide cover 801 and the conical exhaust guide plate 802, surrounding gas can be sucked along a gap between the conical exhaust guide cover 801 and the conical exhaust guide plate 802, the density of the gas is smaller than that of the air, the gas is located on the upper layer of the air, and the gas absorption speed of the upper layer is increased.
The mounting height of the air inlet mechanism 9 is 1.5m-2.0m from the bottom surface of the mine 1, the air inlet mechanism 9 comprises a conical air inlet diffusion cover 901 fixedly mounted at the lower end of an air pipe 14, a plurality of connecting pieces 902 are fixedly mounted at the lower end of the conical air inlet diffusion cover 901, an arc-shaped diffusion plate 903 is fixedly mounted at the lower ends of the connecting pieces 902 together, an air blower 3 blows outside air into the two air inlet branch pipes 7 through an air inlet pipe 4, the air in the two air inlet branch pipes 7 is discharged onto the arc-shaped diffusion plate 903 through the air pipe 14, the air collides with the arc-shaped diffusion plate 903 to diffuse the periphery, and the air moves downwards in the mine 1 because the air density is less than that of, and the height of the air intake mechanism 9 is about the height of a general worker and the height of a stooping work, namely, the air purifier can ensure that workers breathe fresh air and reduce the possibility of carbon monoxide poisoning.
When the gas suction device is used, the device is installed, the exhaust fan 6 and the blower 3 are opened, the exhaust fan 6 forms negative pressure suction in the exhaust pipe 5, the two exhaust branch pipes 10 connected to the exhaust pipe 5 form negative pressure suction, the plurality of gas suction mechanisms 8 are communicated with the exhaust branch pipes 10 through the conical exhaust guide covers 801, the negative pressure suction is formed in the plurality of conical exhaust guide covers 801, and the gas suction mechanisms 8 horizontally absorb gas floating above the upper layer in a mine from the periphery with smaller density through the circular gaps because the conical exhaust guide plates 802 fixedly sleeved on the air pipe 14 and the conical exhaust guide covers 801 form circular gaps to generate negative pressure suction;
The blower 3 sends air into the air inlet pipe 4 to increase the pressure in the air inlet pipe 4, the air flows to two air inlet branch pipes 7 connected to the air inlet pipe 4 along with the air inlet pipe 4, then the air flows to the air inlet mechanism 9 along a plurality of air pipes connected to the two air inlet branch pipes 7, in the air inlet mechanism 9, the air is diffused and discharged downwards along the conical air inlet diffusion cover 901, then the air diffused downwards impacts on the arc diffusion plate 903 below, the air is discharged around along the arc diffusion plate 903, the height of the air inlet mechanism 9 is about 1.7m, namely the fed fresh air can be just breathed by constructors, carbon monoxide poisoning is avoided, and the fed air generates air pressure at the air inlet mechanism 9;
The higher air pressure at the air inlet mechanism 9 and the negative pressure at the air suction mechanism 8 form a pressure difference to form an air flow, that is, the air blower 3 sends air into the air inlet mechanism 9 along the air inlet pipe 4, the air inlet branch pipe 7 and the air pipe 14 and enters the interior of the mine 1 to be diffused downwards and around, so that the gas continuously flows upwards and flows into the air suction mechanism 8 at the negative pressure to be discharged by the exhaust fan 6 along the exhaust branch pipe 10 and the exhaust pipe 5, the air inlet mechanisms 9 and the air suction mechanisms 8 at the air pipes 14 form a circulating air flow to increase the discharge speed of the gas, so that the air environment inside the mine 1 is more suitable for working, and in the process of discharging the gas, dust impurities contained in the gas are filtered by the dust filter box 1302 in the exhaust branch pipe 10, the possibility of blocking of the pipeline is reduced, and the dust removing capacity of the device is increased.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (4)

1. A coal mine underground gas circulation pumping and discharging system comprises an exhaust pipe (5) fixedly inserted in an earth stone layer (2) and extending into a mine (1), and is characterized in that an air inlet pipe (4) is fixedly inserted in the exhaust pipe (5), one end of the exhaust pipe (5) positioned in the mine (1) is symmetrically inserted and communicated with two exhaust branch pipes (10), one end of the air inlet pipe (4) positioned in the mine (1) is symmetrically inserted and communicated with two air inlet branch pipes (7), and the two air inlet branch pipes (7) are respectively positioned in the two exhaust branch pipes (10);
Install jointly between exhaust branch (10) and air intake branch (7) and strain dirt box fixed establishment (13), every it has a plurality of air ducts (14) all to insert the intercommunication on air intake branch (7), and every air duct (14) is equal vertically to pass exhaust branch (10) downwards and is located mine (1), every it inhales mechanism (8), every all to install jointly between air duct (14) and exhaust branch (10) air intake mechanism (9) are all installed to the lower extreme of air duct (14).
2. The coal mine underground gas circulating and pumping system as claimed in claim 1, wherein the dust filtering box fixing mechanism (13) comprises an arc-shaped clamping groove formed in the exhaust branch pipe (10) and a connecting plate (1301) fixedly installed on the exhaust branch pipe (10), and the dust filtering box (1302) is installed in the arc-shaped clamping groove in a sliding mode.
3. The coal mine underground gas circulation pumping system as claimed in claim 1, wherein the air suction mechanism (8) comprises a conical exhaust guide cover (801) which is communicated and installed on the outer side wall of the exhaust branch pipe (10), and the lower end of the air pipe (14) extends into the conical exhaust guide cover (801) and is fixedly sleeved with a conical exhaust guide plate (802).
4. The coal mine underground gas circulation pumping and discharging system as claimed in claim 1, wherein the air intake mechanism (9) comprises a conical air intake diffusion cover (901) fixedly installed at the lower end of the air pipe (14), a plurality of connecting pieces (902) are fixedly installed at the lower end of the conical air intake diffusion cover (901), and an arc-shaped diffusion plate (903) is fixedly installed at the lower ends of the connecting pieces (902) together.
CN201910893500.5A 2019-09-20 2019-09-20 Coal mine underground gas circulating pumping and draining system Active CN110566265B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112012784A (en) * 2020-09-09 2020-12-01 陇东学院 Coal mine underground gas pumping and exhausting purification system
CN112361506A (en) * 2020-11-10 2021-02-12 芜湖慧宇商贸有限公司 Municipal administration pipeline ventilation detection device that takes a breath
CN112483164A (en) * 2020-12-17 2021-03-12 贵州豫能投资有限公司 Coal mine coal face upper corner gas extraction device
CN113863971A (en) * 2021-10-31 2021-12-31 太原理工大学 Safety ventilation device for coal mine and working method
CN117685039A (en) * 2024-02-03 2024-03-12 山西山煤国源煤矿安全技术有限公司 Coal seam gas extraction device and extraction method

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Publication number Priority date Publication date Assignee Title
CN112012784A (en) * 2020-09-09 2020-12-01 陇东学院 Coal mine underground gas pumping and exhausting purification system
CN112361506A (en) * 2020-11-10 2021-02-12 芜湖慧宇商贸有限公司 Municipal administration pipeline ventilation detection device that takes a breath
CN112483164A (en) * 2020-12-17 2021-03-12 贵州豫能投资有限公司 Coal mine coal face upper corner gas extraction device
CN113863971A (en) * 2021-10-31 2021-12-31 太原理工大学 Safety ventilation device for coal mine and working method
CN117685039A (en) * 2024-02-03 2024-03-12 山西山煤国源煤矿安全技术有限公司 Coal seam gas extraction device and extraction method
CN117685039B (en) * 2024-02-03 2024-04-12 山西山煤国源煤矿安全技术有限公司 Coal seam gas extraction device and extraction method

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