CN111379585A - Method for managing gas buried pipe on upper corner of fully mechanized coal mining face - Google Patents
Method for managing gas buried pipe on upper corner of fully mechanized coal mining face Download PDFInfo
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- CN111379585A CN111379585A CN201911360638.5A CN201911360638A CN111379585A CN 111379585 A CN111379585 A CN 111379585A CN 201911360638 A CN201911360638 A CN 201911360638A CN 111379585 A CN111379585 A CN 111379585A
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- extraction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The invention provides a method for managing corner gas buried pipes on a fully mechanized mining face, which comprises the following steps: 1. arranging an extraction pipe, hanging 4 times of steel gas pipelines on a top plate in a front shed along a rail, arranging extraction tee joints on the 4 times of steel gas pipelines at equal intervals, arranging the extraction tee joints on the four times of steel gas pipelines at equal intervals in a staggered manner, 2, arranging a wood buttress, arranging the wood buttress at the upper corner position of the machine tail of a working face, arranging the extraction pipe in the wood buttress, and detaching a lifting appliance; 3. when the extraction tee joint is positioned at the tail of the backward sliding machine, the extraction tee joint starts to work; 4. arranging a flexible spraying wall, erecting a wind tube cloth from the top to the bottom, and then hardening and spraying the wind tube cloth by using a spraying material; and 5, sequentially carrying out the steps 1-4 according to the stoping condition of the fully mechanized coal mining face. The aim of effectively treating gas accumulation at the upper corner while reducing the engineering quantity of the roadway is fulfilled.
Description
Technical Field
The invention belongs to the field of underground coal mine gas treatment, and particularly relates to a method for treating gas buried pipes at corners of a fully mechanized coal mining face.
Background
According to the requirements of coal mine safety regulations, the fully-mechanized mining face is forbidden to use a gas drainage roadway to control gas, but the arrangement of a high-pumping roadway has the problems of low rock roadway tunneling speed, tension in connection, high extraction system capacity requirement and the like, and the safe and efficient production of the single-U-shaped arrangement working face faces the restriction of upper corner gas accumulation, so that technical personnel in the field need to find effective measures for controlling the upper corner urgently to achieve the purposes of reducing roadway engineering quantity and realizing intensive and efficient production.
Disclosure of Invention
The invention provides a method for managing gas buried pipes at upper corners of a fully mechanized coal mining face, which achieves the purpose of effectively managing gas accumulation at the upper corners while reducing the engineering quantity of roadways.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for managing gas buried pipes at corners of a fully mechanized mining face comprises the following steps:
the method comprises the following steps that 1, extraction pipes are arranged, 4 steel gas pipelines are hung on a top plate in a rail-mounted front shed, the 4 steel gas pipelines are arranged in a matrix mode, one ends of the steel gas pipelines extend to upper corners of the rail-mounted front shed, one ends of the steel gas pipelines are connected with gas branch pipes in a rail-mounted roadway through flexible stainless steel pipelines, extraction tee joints are arranged on the 4 steel gas pipelines at equal intervals, the extraction tee joints on the four steel gas pipelines are arranged in an equal-interval staggered mode, the tee joints are alternately and circularly arranged towards a goaf and a bottom surface, and a blocking disc is arranged when the extraction tee joints are not started;
step 3, replacing a plugging disc of the extraction tee joint with an extraction cover when the extraction tee joint is positioned at the tail of the backward sliding machine, and starting the extraction tee joint;
step 4, constructing a flexible spraying wall, erecting air duct cloth from the top to the bottom when the extraction tee joint is positioned in a mining empty area at the rear side of the rear chute, wherein the air duct cloth is perpendicular to the axis of the steel gas pipeline, and then hardening and spraying the air duct cloth by using a spraying material;
and 5, sequentially carrying out the steps 1-4 according to the stoping condition of the fully mechanized coal mining face.
Preferably, the corner gas pipe burying treatment method on the fully mechanized mining face is performed simultaneously in cooperation with the goaf pipe burying pressure relief extraction method.
The method for managing the gas buried pipe at the upper corner of the fully mechanized mining face changes the gas flow field direction of the goaf, forms an open type extraction mode, greatly reduces the gas emission quantity of the goaf to the upper corner, and solves the problem that the gas accumulation of the upper corner restricts production.
Drawings
FIG. 1 is a schematic view of pipe laying according to the method of the present invention.
FIG. 2 is a schematic diagram of the arrangement of a three-way drainage pipe, a wood crib and a spraying wall in the method.
Detailed Description
Application scenarios
Working face of Lu' anwucun coal mine 2206 at 470 horizontal 22 mining area with original gas content of 5-7m3T, the running length of the working surface is 690.4m, the inclined length is 300m, and the optional length is 576.2 m. The average thickness of the coal seam is 5.73m, and the recoverable reserve is about 128.9 ten thousand tons.
The air supply rate of the working face is 3300m3Min, absolute gas emission 34.5m3Permin, extraction quantity 14.3m3Min, according to the statistics and analysis of gas data, the gas emission of the goaf of the working face is 10.58m3Min, gas emission from coal wall is 3m3Min, coal gas falling is 6.91m3/min。
The belt pumping station and the system are equipped with: 470 horizontal 22 mining area mobile pump station is provided with two 2BEC-72 type water ring vacuum pumps with rated energyForce 525m3Min, distance of 2206 working face 1300m, and when a single pump is expected to independently pump the corner buried pipe, the equipped pumping capacity can reach 300m3/min。
The method of the invention is implemented by the following steps,
2206 the track is laid four times in the front shed by D325mm steel gas pipeline, suspended on the roof in matrix form by sling, one end is extended to the upper corner, and the other end is connected with No. 1 return airway D710mm stainless steel pipeline of 22 mining area by flexible stainless steel pipeline, and is pumped by the moving pump station of 22 mining area.
According to the consideration of the extraction radius of the bedding pre-extraction coal hole, an extraction tee joint is arranged every 10 meters in each pipeline, and the four pipeline extraction tee joints are arranged in a staggered mode, namely the distance between the extraction tee joints of the pipelines is 2.5 meters. The three-way pipe is alternately and circularly arranged towards the goaf and the bottom surface due to the limitation of the middle space of the wood crib. And a plugging disc is arranged before the tee extraction port is not started.
and 3, when the first extraction tee joint of the first pipeline is positioned at the tail of the back-sliding machine, replacing the blocking disc with an extraction cover, starting the extraction tee joint, then throwing one tee joint to the opposite side of the tail of the back-sliding machine along with the advance of the working face for 2.5 meters, and correspondingly replacing the blocking disc with the extraction cover at that time to start the extraction tee joint.
And 4, constructing a flexible spraying wall, erecting air duct cloth from the top to the bottom when the extraction tee joint is positioned in a mining empty area at the rear side of the rear sliding machine tail, wherein the air duct cloth is perpendicular to the axis of the steel gas pipeline, and then hardening and spraying the air duct cloth by using a spraying material, so that an extraction space with relatively sealed upper corners is manufactured artificially, and low-concentration air flow is prevented from being pumped.
And 5, sequentially carrying out the steps 1-4 according to the stoping condition of the fully mechanized coal mining face.
The monitoring of the use effect is carried out,
an online monitoring system of an extraction system is installed on the 2206 track along four gas extraction pipelines, so that the gas concentration, flow, temperature and CO concentration parameters of the pipelines can be monitored in real time, and the temperature and CO concentration rise alarm function can be realized; and meanwhile, the fully mechanized mining team is provided with an infrared thermometer, and the temperature of the upper corner buried pipe is measured every hour.
The result is obtained after 45 days of trial, the gas concentration of the upper corner is reduced from about 0.75% to about 0.4%, and the gas concentration tends to be stable, so that the problem of the gas concentration of the upper corner is thoroughly solved.
Claims (2)
1. A method for managing gas buried pipes at corners of a fully mechanized coal mining face is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps that 1, extraction pipes are arranged, 4 steel gas pipelines are hung on a top plate in a rail-mounted front shed, the 4 steel gas pipelines are arranged in a matrix mode, one ends of the steel gas pipelines extend to upper corners of the rail-mounted front shed, one ends of the steel gas pipelines are connected with gas branch pipes in a rail-mounted roadway through flexible stainless steel pipelines, extraction tee joints are arranged on the 4 steel gas pipelines at equal intervals, the extraction tee joints on the four steel gas pipelines are arranged in an equal-interval staggered mode, the tee joints are alternately and circularly arranged towards a goaf and a bottom surface, and a blocking disc is arranged when the extraction tee joints are not started;
step 2, arranging a wood buttress, arranging the wood buttress at the upper corner position of the machine tail of the working face, arranging the extraction pipe in the wood buttress, and removing the lifting appliance after the steel gas pipeline is effectively supported by the wood buttress; laying metal nets and nylon nets on two sides of the wood pile along the axis direction of the steel gas pipeline;
step 3, replacing a plugging disc of the extraction tee joint with an extraction cover when the extraction tee joint is positioned at the tail of the backward sliding machine, and starting the extraction tee joint;
step 4, constructing a flexible spraying wall, erecting air duct cloth from the top to the bottom when the extraction tee joint is positioned in a mining empty area at the rear side of the rear chute, wherein the air duct cloth is perpendicular to the axis of the steel gas pipeline, and then hardening and spraying the air duct cloth by using a spraying material;
and 5, sequentially carrying out the steps 1-4 according to the stoping condition of the fully mechanized coal mining face.
2. The method for managing corner gas buried pipes on the fully mechanized mining face according to claim 1, wherein: the method for managing the gas buried pipe at the upper corner of the fully mechanized mining face is performed simultaneously in cooperation with the method for pressure relief and extraction of the buried pipe in the goaf.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112302706A (en) * | 2020-11-27 | 2021-02-02 | 陕西旬邑青岗坪矿业有限公司 | Method for freely regulating and controlling depth of upper corner buried pipe to extract gas in goaf |
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| CN207485466U (en) * | 2017-11-30 | 2018-06-12 | 梁福和 | Gas at upper corner drainage device during high methane coal working face is just adopted |
| CN109252884A (en) * | 2018-09-13 | 2019-01-22 | 辽宁工程技术大学 | A kind of gob side entry retaining working face Y type ventilation anti-disaster method of pressure regulation |
| CN110219694A (en) * | 2019-07-23 | 2019-09-10 | 中国矿业大学(北京) | A kind of goaf gas collects band subregion pumping method |
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2019
- 2019-12-25 CN CN201911360638.5A patent/CN111379585A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2373399C1 (en) * | 2008-04-24 | 2009-11-20 | Общество с ограниченной ответственностью фирма "РОСТ-Л" | Method of coal layer degasification |
| CN205089360U (en) * | 2015-11-13 | 2016-03-16 | 山西潞安集团余吾煤业有限责任公司 | Large aperture collecting space area pipe laying gas drainage device |
| CN106337695A (en) * | 2016-09-23 | 2017-01-18 | 河南理工大学 | Comprehensive treatment method for spontaneous combustion of residual coal in goaf and transfinite gas at upper corner |
| CN207485466U (en) * | 2017-11-30 | 2018-06-12 | 梁福和 | Gas at upper corner drainage device during high methane coal working face is just adopted |
| CN109252884A (en) * | 2018-09-13 | 2019-01-22 | 辽宁工程技术大学 | A kind of gob side entry retaining working face Y type ventilation anti-disaster method of pressure regulation |
| CN110219694A (en) * | 2019-07-23 | 2019-09-10 | 中国矿业大学(北京) | A kind of goaf gas collects band subregion pumping method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112302706A (en) * | 2020-11-27 | 2021-02-02 | 陕西旬邑青岗坪矿业有限公司 | Method for freely regulating and controlling depth of upper corner buried pipe to extract gas in goaf |
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