CN113914931A - Method for performing goaf sealing and combustion inhibition by utilizing gangue isolation belt in coal mining process - Google Patents
Method for performing goaf sealing and combustion inhibition by utilizing gangue isolation belt in coal mining process Download PDFInfo
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- CN113914931A CN113914931A CN202111157065.3A CN202111157065A CN113914931A CN 113914931 A CN113914931 A CN 113914931A CN 202111157065 A CN202111157065 A CN 202111157065A CN 113914931 A CN113914931 A CN 113914931A
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- coal
- gangue
- mining
- isolation belt
- sealing
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- 239000003245 coal Substances 0.000 title claims abstract description 95
- 238000005065 mining Methods 0.000 title claims abstract description 68
- 238000002955 isolation Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007789 sealing Methods 0.000 title claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 14
- 230000005764 inhibitory process Effects 0.000 title claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003566 sealing material Substances 0.000 claims abstract description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 21
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 230000005484 gravity Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 9
- 239000002910 solid waste Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 239000011381 foam concrete Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000010883 coal ash Substances 0.000 claims 1
- 230000002269 spontaneous effect Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 230000008093 supporting effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010878 waste rock Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009919 sequestration 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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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
-
- 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a method for sealing and storing a goaf and inhibiting combustion by utilizing a gangue isolation belt in a coal mining process, which utilizes coal mining equipment to carry out coal seam mining on a working face in a subsection mode so as to discharge top coal behind the gangue belt as much as possible; horizontally laying a sealing material filling pipeline and a carbon dioxide gas injection pipeline at intervals from front to back on the ground of the working surface through roadways on two sides of the working surface; when the coal-pushing hydraulic mechanism reaches the designed position of the gangue isolation belt, the baffle plate is closed, the gangue integrally collapses to the rear of the coal mining equipment under the action of gravity, and a complete gangue isolation belt is formed in the goaf; firstly, injecting a fluid-shaped sealing material into a newly formed gangue isolation belt sealing unit, and then injecting gaseous carbon dioxide; the construction is circularly and continuously pushed forward, and the construction is carried out along with mining and filling. The timely filling can prevent spontaneous combustion in the goaf in time, support the roof, reduce the possibility of roof stress concentration and dynamic disaster, and reduce coal loss.
Description
Technical Field
The invention relates to the technical field of coal seam safety mining, in particular to a method for sealing and storing carbon dioxide in a goaf by utilizing a gangue isolation belt in a coal mining process, and avoiding fire disasters caused by spontaneous combustion of the goaf.
Background
The existing coal mining equipment mainly comprises a coal mining machine, a front conveyor, a rear conveyor and a top coal caving hydraulic mechanism. The coal mining machine is arranged at the forefront of the whole coal mining equipment, can mine a front coal bed and is transported away by a front conveyor; the top coal caving hydraulic mechanism is arranged at the top of the middle rear part of the whole coal mining equipment and is used for caving top coal. The hydraulic mechanism for caving the top coal is provided with a baffle plate, and in the normal starting process, the baffle plate is opened, so that the top coal automatically collapses under the action of gravity and is transported away on the rear conveyor. In the mining process, in order to prevent the top gangue from caving, the top coal should not be placed too much, so that more top coal is left, and resources are wasted.
In addition, a goaf formed by coal seam mining is sequentially divided into a choking zone, a heat dissipation zone and an oxidation zone along the mining direction. At present, in order to prevent spontaneous combustion of a goaf, a hole needs to be drilled in the top of the goaf, and sealing materials are filled into the goaf through the drilled hole, so that carbon dioxide gas is absorbed, cured and sealed. On one hand, the top drilling hole cannot be suitable for an upward mining mode of multiple coal seams, and when the coal seam at the lowest layer is mined, the drilling hole can damage the stability of the upper coal seam; on the other hand, the sealing material is injected after the coal seam is mined, the sealing material cannot be sealed along with mining and filling, and the roof is easy to collapse when the support strength of the roof in the goaf is not enough.
Disclosure of Invention
The invention aims to provide a mining mode which can carry out mining and filling along with mining in the coal mining process, timely filling can timely prevent a goaf from spontaneous combustion, support a roof plate, reduce the possibility of roof plate stress concentration and dynamic disaster and reduce coal loss.
Therefore, the technical scheme adopted by the invention is as follows: a method for performing goaf sealing and combustion inhibition by utilizing a gangue isolation belt in a coal mining process comprises the following steps:
the method comprises the following steps that firstly, coal mining equipment is utilized to mine a coal bed on a working face in a segmented mode, when a top coal hydraulic mechanism is close to a designed position of a gangue isolation belt, forward mining is continued, a baffle of a top coal caving hydraulic mechanism is kept open, top coal behind the gangue belt can still collapse to a rear conveying mechanism under the action of gravity to be conveyed away, and therefore the top coal behind the gangue belt can be discharged as much as possible; meanwhile, a working face formed behind the coal mining equipment is utilized, pre-buried pipelines are horizontally laid on the ground of the working face at intervals from front to back through roadways on two sides of the working face, the pre-buried pipelines comprise a sealing material filling pipeline and a carbon dioxide gas injection pipeline, and openings are uniformly distributed on the side walls of the sealing material filling pipeline and the carbon dioxide gas injection pipeline;
secondly, when the top coal hydraulic mechanism reaches the designed position of the gangue isolation belt, closing the baffle plate, enabling the gangue to integrally collapse to the rear of the coal mining equipment under the action of gravity, forming a complete gangue isolation belt in a goaf, and forming a closed sealing unit by using the gangue isolation belt;
thirdly, the coal mining equipment continues to carry out coal seam mining on the next section of working face forwards, and in a sealing unit of the gangue isolation belt which is just formed, a fluid sealing material is injected into the sealing unit by using a sealing material filling pipeline, and then gaseous carbon dioxide is injected into the sealing unit formed by using a carbon dioxide gas injection pipeline;
and fourthly, taking the first step to the third step as a cycle, continuing to advance to construct, and carrying out mining and filling along with the coal seam until the coal seam mining is finished, thereby forming a plurality of gangue isolation and storage units in the whole coal seam mining working face.
Preferably, the filling material is foam concrete made of solid waste base materials, and the solid waste base materials are fly ash or carbide slag.
More preferably, the sealing material filling pipeline and the carbon dioxide gas injection pipeline are two or more and are arranged in a staggered manner from front to back, and the spacing distance is 50-100 m.
The invention has the beneficial effects that:
(1) after the working face is formed, pre-buried pipelines are laid on the working face by using the roadways on the two sides, after a sealing unit is formed, the pre-buried pipelines are used for injecting sealing materials and gaseous carbon dioxide in time, the sealing materials can be used for supporting the goaf in time, the supporting effect on the roof is enhanced, the time is saved, and the mining efficiency is improved;
(2) the method has the advantages that the method is particularly suitable for multi-coal-seam up mining by utilizing the embedded pipeline which is horizontally laid in the transverse direction to inject the sealing material, the upper coal seam cannot be damaged by punching the top of the coal seam, and the sealing material can timely play a certain supporting role on the top plate after being injected, so that the method has obvious advantages and higher universality;
(3) in the traditional coal seam mining process, in order to prevent the top gangue from collapsing, the top coal is not required to be placed too much, and the whole coal seam mining working face field causes more top coal loss; in order to discharge the gangue, the top coal behind the gangue belt needs to be discharged as much as possible, and the top coal can be discharged more due to the timely formation of the sealing and storing unit, so that the mining amount is increased;
(4) the sealing and storing unit is formed by utilizing a waste rock zone formed naturally in a coal bed and combining with a waste rock isolation zone formed by automatic collapse in the mining process, the sealing and storing unit can be sealed and stored along with mining, the conception is novel and unique, and the construction operation is convenient, rapid and efficient;
(5) the timely formed individual sealing units greatly increase the length of the extinguishing zone in the goaf, obviously reduce the lengths of the oxidation zone and the heat dissipation zone, and have obvious combustion inhibiting effect on sealing.
Drawings
FIG. 1 is a coal mining state diagram (with the damper open) of the coal mining equipment in a non-gangue isolation belt design position.
FIG. 2 is a coal mining state diagram of the coal mining equipment at a designed position of a gangue isolation belt (the state that a baffle is closed and gangue slides to the rear of the coal mining equipment).
FIG. 3 is a schematic diagram of a bottom embedded pipeline after a coal seam mining face is formed.
Figure 4 is a comparison of the length of three zones of the goaf in comparison to a conventional mining mode.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
with reference to fig. 1-4, the method for goaf sealing and combustion inhibition by using the gangue isolation belt in the coal mining process is suitable for a fully mechanized caving face to use the gangue isolation belt to seal off carbon dioxide in the goaf and inhibit spontaneous combustion of residual coal, plays a supporting role for a top plate, reduces the possibility of stress concentration and power disaster of the top plate, and reduces the residual coal. The method specifically comprises the following steps:
in the first step, the coal mining equipment is used to mine the coal seam on the working face in sections, for example 200m as a length of a sequestration unit. When the top coal hydraulic mechanism approaches the designed position of the gangue isolation belt, the mining continues to be carried forward, the baffle of the top coal hydraulic mechanism is kept open, the top coal behind the gangue belt can still collapse to the rear conveying mechanism under the action of gravity to be conveyed away, so that the top coal behind the gangue belt is discharged as much as possible, but a small amount of top coal still can be avoided; meanwhile, pre-buried pipelines are horizontally laid on a working face formed behind the coal mining equipment at intervals from front to back to the ground of the working face through roadways on two sides of the working face. The pre-buried pipeline comprises a sealing material filling pipeline and a carbon dioxide gas injection pipeline, and openings are uniformly distributed in the side walls of the sealing material filling pipeline and the carbon dioxide gas injection pipeline.
And secondly, when the top coal hydraulic mechanism reaches the designed position of the gangue isolation belt, closing the baffle, enabling the gangue to integrally collapse to the rear of the coal mining equipment under the action of gravity, forming a complete gangue isolation belt in the goaf, and forming a closed sealing unit by using the gangue isolation belt.
And thirdly, continuing to mine the coal bed on the next section of working face by the coal mining equipment, firstly injecting fluid sealing materials into the sealing units by using sealing material filling pipelines in the sealing units of the gangue isolation belts just formed, and then injecting gaseous carbon dioxide into the sealing units formed by using carbon dioxide gas injection pipelines.
And fourthly, taking the first step to the third step as a cycle, continuing to advance to construct, and carrying out mining and filling along with the coal seam until the coal seam mining is finished, thereby forming a plurality of gangue isolation and storage units in the whole coal seam mining working face.
The filling material is foam concrete made of solid waste base materials, and the solid waste base materials are fly ash or carbide slag.
The sealing material filling pipelines and the carbon dioxide gas injection pipelines are two or more and are arranged in a staggered manner from front to back, and the spacing distance is 50 +/-110 m.
Claims (3)
1. A method for performing goaf sealing and combustion inhibition by utilizing a gangue isolation belt in a coal mining process is characterized by comprising the following steps:
the method comprises the following steps that firstly, coal mining equipment is utilized to mine a coal bed on a working face in a segmented mode, when a top coal hydraulic mechanism is close to a designed position of a gangue isolation belt, forward mining is continued, a baffle of a top coal caving hydraulic mechanism is kept open, top coal behind the gangue belt can still collapse to a rear conveying mechanism under the action of gravity to be conveyed away, and therefore the top coal behind the gangue belt can be discharged as much as possible; meanwhile, a working face formed behind the coal mining equipment is utilized, pre-buried pipelines are horizontally laid on the ground of the working face at intervals from front to back through roadways on two sides of the working face, the pre-buried pipelines comprise a sealing material filling pipeline and a carbon dioxide gas injection pipeline, and openings are uniformly distributed on the side walls of the sealing material filling pipeline and the carbon dioxide gas injection pipeline;
secondly, when the top coal hydraulic mechanism reaches the designed position of the gangue isolation belt, closing the baffle plate, enabling the gangue to integrally collapse to the rear of the coal mining equipment under the action of gravity, forming a complete gangue isolation belt in a goaf, and forming a closed sealing unit by using the gangue isolation belt;
thirdly, the coal mining equipment continues to carry out coal seam mining on the next section of working face forwards, and in a sealing unit of the gangue isolation belt which is just formed, a fluid sealing material is injected into the sealing unit by using a sealing material filling pipeline, and then gaseous carbon dioxide is injected into the sealing unit formed by using a carbon dioxide gas injection pipeline;
and fourthly, taking the first step to the third step as a cycle, continuing to advance to construct, and carrying out mining and filling along with the coal seam until the coal seam mining is finished, thereby forming a plurality of gangue isolation and storage units in the whole coal seam mining working face.
2. The method for goaf sealing and combustion inhibition by utilizing the gangue isolation belt in the coal mining process according to claim 1, characterized by comprising the following steps: the filling material is foam concrete made of solid waste base materials, and the solid waste base materials are coal ash or carbide slag.
3. The method for goaf sealing and combustion inhibition by utilizing the gangue isolation belt in the coal mining process according to claim 1, characterized by comprising the following steps: the sealing material filling pipeline and the carbon dioxide gas injection pipeline are two or more, are arranged in a staggered mode from front to back, and are spaced at a distance of 50-110 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111157065.3A CN113914931B (en) | 2021-09-30 | 2021-09-30 | Method for goaf sealing and burning inhibition by gangue isolation belt in coal mining process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111157065.3A CN113914931B (en) | 2021-09-30 | 2021-09-30 | Method for goaf sealing and burning inhibition by gangue isolation belt in coal mining process |
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| CN113914931A true CN113914931A (en) | 2022-01-11 |
| CN113914931B CN113914931B (en) | 2023-11-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961845A (en) * | 2022-06-17 | 2022-08-30 | 中国矿业大学 | Goaf carbon sealing method based on stratified approach tailing cemented filling mining |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799738A (en) * | 1981-11-03 | 1989-01-24 | Tatabanyai Szenbanyak | Mining method for working large-scale mineral deposits by the caving system |
| CN105317459A (en) * | 2015-11-19 | 2016-02-10 | 中国矿业大学(北京) | Subarea filling method used for controlling large-area falling disaster of hard roof |
| CN108204244A (en) * | 2016-12-20 | 2018-06-26 | 中国矿业大学(北京) | The spoil interval method of collecting coal by the means of filling |
| CN113389589A (en) * | 2021-07-30 | 2021-09-14 | 西安科技大学 | Goaf coal spontaneous combustion partition isolation prevention method based on coal face pushing progress |
| CN113404538A (en) * | 2021-06-30 | 2021-09-17 | 苗春光 | System and method for sealing and storing carbon dioxide based on coal mine goaf |
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2021
- 2021-09-30 CN CN202111157065.3A patent/CN113914931B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799738A (en) * | 1981-11-03 | 1989-01-24 | Tatabanyai Szenbanyak | Mining method for working large-scale mineral deposits by the caving system |
| CN105317459A (en) * | 2015-11-19 | 2016-02-10 | 中国矿业大学(北京) | Subarea filling method used for controlling large-area falling disaster of hard roof |
| CN108204244A (en) * | 2016-12-20 | 2018-06-26 | 中国矿业大学(北京) | The spoil interval method of collecting coal by the means of filling |
| CN113404538A (en) * | 2021-06-30 | 2021-09-17 | 苗春光 | System and method for sealing and storing carbon dioxide based on coal mine goaf |
| CN113389589A (en) * | 2021-07-30 | 2021-09-14 | 西安科技大学 | Goaf coal spontaneous combustion partition isolation prevention method based on coal face pushing progress |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961845A (en) * | 2022-06-17 | 2022-08-30 | 中国矿业大学 | Goaf carbon sealing method based on stratified approach tailing cemented filling mining |
| CN114961845B (en) * | 2022-06-17 | 2023-02-24 | 中国矿业大学 | Gob carbon sequestration method based on stratified approach tailing cemented filling mining |
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| CN113914931B (en) | 2023-11-28 |
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Application publication date: 20220111 Assignee: SHANDONG DINGAN TESTING CO.,LTD. Assignor: SHANDONG University OF SCIENCE AND TECHNOLOGY Contract record no.: X2024980000808 Denomination of invention: A method for sealing and suppressing combustion in goaf using gangue isolation belts during coal mining Granted publication date: 20231128 License type: Common License Record date: 20240116 |
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