CN116163730A - Method for mining and sealing carbon dioxide by bidirectional forward filling of thin coal layer drilling machine - Google Patents
Method for mining and sealing carbon dioxide by bidirectional forward filling of thin coal layer drilling machine Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 149
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 238000005553 drilling Methods 0.000 title claims abstract description 103
- 238000005065 mining Methods 0.000 title claims abstract description 80
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 69
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 69
- 238000007789 sealing Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002457 bidirectional effect Effects 0.000 title claims description 4
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 239000002912 waste gas Substances 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 7
- 238000000547 structure data Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 29
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 230000009919 sequestration Effects 0.000 claims description 11
- 230000005641 tunneling Effects 0.000 claims description 9
- 230000036571 hydration Effects 0.000 claims description 8
- 238000006703 hydration reaction Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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
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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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Abstract
The invention discloses a method for filling and mining by bi-directional forward movement of a thin coal layer drilling machine and sealing carbon dioxide, which relates to the technical field of coal mining, and comprises the following steps: (1) Surveying mine geological conditions to obtain coal seam geological structure data; (2) preparing filling slurry; (3) laying out the work surface and the arrangement device; (4) distributing carbon dioxide transportation pipelines; (5) arranging filling pipelines; (6) Drilling and mining the upper and lower upper coal beds by using a spiral drilling machine; (7) transporting coal to the ground by using a scraper conveyor; (8) advancing the spiral drilling machine; (9) The goaf is treated, coal gangue is used for filling in situ, and filling slurry and carbon dioxide waste gas are sequentially injected; (10) roadway support is carried out; and (11) repeating the steps (2) - (10). The safe and efficient exploitation of the thin coal seam with the thickness of 0.8-1.3 m is realized, the economic benefit is improved, the coal gangue is filled in situ, and the geological storage of carbon dioxide in the exploitation process is realized.
Description
Technical Field
The invention relates to the technical field of coal mining and the technical field of carbon dioxide geological sequestration, in particular to a method for mining by bidirectional forward filling of a thin coal layer drilling machine and carbon dioxide sequestration.
Background
The coal industry is an important basic industry in China. According to statistics, coal accounts for over 70% of the primary energy constitution and consumption structure in China for a long time. In recent years, energy transformation is advocated, the consumption ratio of coal is reduced to about 56%, and by 2050, the main position of 50% of coal is expected to be unchanged in the future of China for a quite long time. Therefore, the exploitation of coal is of great importance to the development of the economy in China. The coal seam in China is divided according to the thickness, the coal seam with the thickness smaller than 0.8m is called an ultrathin coal seam, and the coal seam with the thickness of 0.8-1.3 m is the thin coal seam. Among the existing thin coal seam mining amounts, the thin coal seam with the thickness of 0.8-1.3 m accounts for 86.02 percent, and the recoverable reserve accounts for 20 percent of the total reserve of the coal seam in China, so that the method has great development potential. Meanwhile, the mining of the thin coal seam can prolong the service life of a mining area, improve the recovery rate of resources, and can be used as a liberation layer for mining to prevent rock burst and coal and gas outburst of the mining of the coal seam. However, under the national goals of "carbon peak", "carbon neutralization", how to achieve both guaranteed energy supply and effective reduction of carbon emissions is a difficult problem. In the south of China, a lot of thin coal layers are mainly reserved, and the thin coal layers have huge reserves. The method fully adopts the thought of integrating the geological storage of the carbon dioxide collected by the thin coal seam, and forms a mode of resource development and environmental protection, thereby having very broad prospect.
At present, china has obtained stable mining method results in the aspect of mining medium-thickness coal seams and is in an international leading position, but the mining aspect of thin coal seams is relatively weak. Mining of thin coal seams is affected by a number of factors. In objective factors, the occurrence conditions of the thin coal seam are relatively deviated, the working space is narrow, the working environment is poor, the exploitation difficulty is high, the requirements on the size, the power and the performance of mechanical equipment are high, and the efficient mechanized exploitation is difficult to realize. The traditional spiral drilling machine coal mining method can reduce the coal seam thickness mining lower limit, mining can be performed by 0.4m at the lowest, workers do not need to enter a working face, and safety is high. However, in the actual exploitation process, an isolated coal pillar is reserved every time a hole is drilled and exploited, and the drilling and exploiting width and the isolated coal pillar width are smaller, so that a plurality of defects such as the frequency of equipment movement and the like are increased. In addition, a large amount of gangue is generated during mining of the thin coal seam, so that the gangue is discharged outside, a large amount of land is occupied, and the escape and leaching of sulfide in the gangue pollute the environment. Thus, the exploitation difficulty and inefficiency of the thin coal layer are caused, and the carbon dioxide is difficult to geological seal in the thin coal layer.
Aiming at the defects of coal pillar reserving, frequent equipment moving, environmental pollution caused by waste gangue and the like in the thin coal seam exploitation, the method for the double-forward filling exploitation and the carbon dioxide sealing of the thin coal seam drilling machine is provided, so that the safe and efficient exploitation of the thin coal seam is realized, the economic benefit is improved, and meanwhile, the in-situ filling of the coal gangue and the geological sealing of the carbon dioxide discharged by industry are realized.
Disclosure of Invention
The invention aims to solve the problem of integration of carbon dioxide geological storage by safely opening and collecting a thin coal seam, and provides a thin coal seam drilling machine filling and mining method capable of realizing safe and efficient mining of the thin coal seam, in-situ filling of coal gangue and carbon dioxide geological storage.
In order to achieve the aim, the invention provides a method for double-forward filling exploitation and carbon dioxide sealing of a thin coal seam drilling machine, which comprises the steps of using a spiral drilling machine, a scraper conveyor, a gas compression pump, a carbon dioxide conveying pipe, a high-pressure pipe, a filling pipeline, a filling pipe and a monorail crane, wherein a single roadway is arranged in the middle of a thin coal seam to be exploited.
The specific implementation steps are as follows:
(1) Preparation work before exploitation: prospecting mine geological conditions to obtain parameters of coal seam geological structure data such as coal seam inclination angle, coal seam thickness, roof lithology, roof pressure, coal seam burial depth and the like, and then selecting a machine type and a supporting mode to determine the width of an isolated coal pillar so as to ensure that roof does not collapse;
(2) The preparation step of filling slurry: crushing solid waste such as coal gangue, waste concrete and the like on the ground surface, and then adding cement and water according to a certain proportion to prepare filling slurry;
(3) Mining working face layout: selecting a thin coal seam development area in the delineated coal mining area, carrying out overall layout on a mining working face, and digging a single roadway in the middle part of the coal seam and supporting; arranging a spiral drilling machine in a single tunnel, fixedly supporting the spiral drilling machine on a coal wall by using hydraulic pressure, delaying a tunneling surface by a certain distance, and enabling the machine body direction to be parallel to the tunnel direction; the two scraper conveyors are respectively arranged on the left side and the right side of the single tunnel bottom plate, the number of the monorail cranes is two, and the two scraper conveyors are respectively arranged on the left side and the right side of the single tunnel top plate;
(4) Carbon dioxide transportation pipeline layout step: the carbon dioxide transportation pipeline consists of two gas compression pumps, two gas conveying pipes and two high-pressure pipes, wherein the gas compression pumps, the gas conveying pipes and the high-pressure pipes are respectively arranged at bottom plates at two sides of a roadway and positioned between the side wall of a single roadway and the scraper conveyor;
(5) Filling pipeline layout: arranging filling pipelines at parallel positions on two sides of a single roadway and above a drill hole, and arranging filling pipes at positions, close to the goaf, of the filling pipelines, wherein the filling pipes are used for filling the goaf;
(6) And (3) drilling and mining by an auger: when the spiral drilling machine drills, firstly, the spiral drilling machine is oriented, then, the coal seam on the upper side of a single roadway is drilled and mined in an inclined direction, a drill bit of the spiral drilling machine longitudinally pushes coal cutting, a spiral drill rod draws coal, after the completion, the direction of the spiral drilling machine is turned to the lower side, the coal seam on the lower side is drilled and mined, and namely, the coal on the two sides of the roadway is mined;
(7) Coal dropping and coal conveying steps: after the coal is drawn out by the spiral drill rod, the coal directly falls on a scraper conveyor on the same side as the drilled hole, and the coal is conveyed to a production area;
(8) Advancing the spiral drilling machine: after the steps (1) - (7) are completed, tunneling the single tunnel forwards, separating the spiral drilling machine from the spiral drilling rod, conveying the spiral drilling rod to a next drilling site by using an overhead monorail crane on the same side as the spiral drilling rod, then moving the spiral drilling machine to the next drilling site along the single tunnel, and completing assembly work of the spiral drilling machine and the spiral drilling rod at the next site;
(9) Goaf treatment steps: constructing a sealing wall body at the edge of the goaf, wherein the thickness of the sealing wall body is determined according to the gas pressure of the goaf; in addition, when the sealing wall is constructed, a filling hole and an exhaust hole are reserved on the left side and the right side above the sealing wall respectively, a carbon dioxide injection hole is reserved on the right side below the sealing wall, the carbon dioxide injection hole is closed first, the filling hole and the exhaust hole are opened, and the filling pipe penetrates through the filling hole; conveying the slurry prepared in the step (2) into goafs on two sides of a single roadway through a filling pipeline and a filling pipe, compacting, then injecting hydration liquid into the compacted filler through the filling pipeline for hydration, then closing a filling hole, opening a carbon dioxide injection hole, injecting carbon dioxide waste gas into the hydrated filler, and sequentially driving original air in the goafs through a gas conveying pipe, a gas compression pump, a high-pressure pipe and the carbon dioxide injection hole by carbon dioxide and discharging the original air out of the goafs through an exhaust hole; when the concentration of the carbon dioxide discharged from the exhaust hole reaches a preset value, stopping introducing the carbon dioxide waste gas, and sealing the filling hole and the exhaust hole to realize geological storage of the carbon dioxide and reinforcement of the goaf;
(10) Roadway support step: after the spiral drilling machine advances, a supporting structure is arranged at a drilling position on the spiral drilling machine in time;
(11) And (2) to (10) are filling drilling and mining cycles, so that the filling drilling and mining are carried out along with the tunneling forward, and an isolated coal pillar is reserved between adjacent drilling goafs until the mining of the mining area is completed.
Further, in the step (1), the thickness of the thin coal layer is 0.8-1.3 m.
Further, in the step (2), the prepared filling slurry has the characteristics of good fluidity, fast coagulation, micro expansion, fast early strength development and high strength.
Further, in the step (2), the inclination angle, that is, the inclination angle of the coal seam is ±15°, and the inclination angle of the coal seam can be enlarged to ±25° with the drilling length reduced.
Further, in the step (2), the cross-sectional area of the single roadway is not less than 9 square meters.
Further, in the step (3), a distance of the lagging heading face is 20m, and the specific value is determined by roof pressure and goaf width in actual mining engineering.
Further, in the step (9), in order to ensure the efficient performance of the coal mining operation, when the coal mining operation with the downward coal seam is completed, the filling and solidification of the paste with the upward trend are completed simultaneously, and when the paste reaches the required strength, the subsequent coal mining operation and the filling operation of the goaf are carried out;
compared with the prior art, the invention has the following advantages:
(1) According to the method for mining the thin coal seam by bi-directional forward filling and sealing carbon dioxide, the single roadway is arranged, the spiral drilling machine is used for mining the thin coal seam on the upper side and the lower side, timely filling in the goaf and timely supporting the roadway, so that the mining efficiency is improved, and the mining safety and economic benefit are improved.
(2) The invention relates to a method for filling and mining by bi-directional forward movement of a thin coal layer drilling machine and sealing and storing carbon dioxide, which utilizes filling slurry conveyed to a goaf from the ground surface and coal gangue generated on a working surface of spiral drilling machine mining to fill and drill the goaf together, thereby realizing the in-situ filling of the coal gangue.
(3) According to the method for filling exploitation and carbon dioxide sealing by the thin coal seam drilling machine in the bi-directional advancing mode, hydration liquid is added into the compacted filler for hydration and carbon dioxide waste gas is injected, and geological sealing of carbon dioxide in the exploitation process is achieved.
Drawings
FIG. 1 is a schematic top view of a mining face structure in a method for bi-directional forward filling mining and carbon dioxide sequestration of a thin seam drilling machine according to the present invention;
FIG. 2 is a schematic diagram of goaf sealing in a method of dual forward filling mining and carbon dioxide sequestration of a thin seam drilling machine according to the present invention;
FIG. 3 is a schematic top view of a layout structure of a carbon dioxide transportation pipeline of a mining face in a method of double-forward filling mining and carbon dioxide sequestration of a thin coal seam drilling machine;
FIG. 4 is a schematic top view of a mining face filling pipeline layout structure in a method for bi-directional forward filling mining and carbon dioxide sequestration of a thin seam drilling machine according to the present invention;
FIG. 5 is a schematic diagram of a method of mining with dual forward fill mining and carbon dioxide sequestration for a thin seam rig according to the present invention;
in the figure, a spiral drilling machine 1, a spiral drill rod 2, a scraper conveyor 3, a carbon dioxide injection hole 4, a sealing wall body 5, an overhead monorail 6, a tunneling surface 7, a single roadway 8, a goaf 9, an isolated coal pillar 10, a drill bit 11, a drilling and production hole 12, a gas compression pump 13, a gas conveying pipe 14, a high-pressure pipe 15, a filling pipeline 16, a filling pipe 17, a filling hole 18 and an exhaust hole 19.
Detailed Description
A method for mining and sealing carbon dioxide by bi-directional forward filling of a thin coal layer drilling machine comprises the following steps:
(1) Preparation work before exploitation: prospecting mine geological conditions to obtain parameters of coal seam geological structure data such as coal seam inclination angle, coal seam thickness, roof lithology, roof pressure, coal seam burial depth and the like, and then selecting a machine type and a supporting mode to determine the width of an isolated coal pillar so as to ensure that the roof does not collapse in a large area;
(2) The preparation step of filling slurry: crushing solid waste materials such as coal gangue, waste concrete and the like, and then adding cement and water according to a certain proportion to prepare filling slurry;
(3) Mining working face layout: selecting a thin coal seam development area in the delineated coal mining area, carrying out overall layout on a mining working face, and digging a single roadway 8 in the middle part of the coal seam and carrying out support; arranging a spiral drilling machine in a single tunnel 8, fixedly supporting the spiral drilling machine 8 on a coal wall by using hydraulic pressure, delaying a tunneling surface 7 by a distance, and enabling the machine body direction to be parallel to the tunnel direction; the number of the scraper conveyors 3 is two, the scraper conveyors are respectively arranged on the left side and the right side of the bottom plate of the single tunnel 8, the number of the monorail cranes 6 is two, and the scraper conveyors are respectively arranged on the left side and the right side of the top plate of the single tunnel 8;
(4) Carbon dioxide transportation pipeline layout step: the carbon dioxide transportation pipeline consists of two gas compression pumps 13, two gas conveying pipes 14 and two high-pressure pipes 15, wherein the gas compression pumps 13, the gas conveying pipes 14 and the high-pressure pipes 15 are respectively arranged at the bottom plates at two sides of the single roadway 8 and are positioned between the side wall of the single roadway 8 and the scraper conveyor 3, one end of each gas compression pump 13 is connected with the gas conveying pipe 14, the other end of each gas compression pump 13 is connected with the high-pressure pipe 15 communicated with the goaf 9, carbon dioxide waste gas is injected into the goaf 9, the appearance of each high-pressure pipe is an L-shaped pipeline, one end of each high-pressure pipe penetrates into the goaf 9, and the other end of each high-pressure pipe is connected with the gas compression pump 13;
(5) Filling pipeline layout: a filling pipeline 16 is arranged at the parallel positions of the two sides of the single roadway 8 and the upper part of the drill hole 12, a filling pipe 17 is arranged at the position, close to the goaf 9, of the filling pipeline 16, and the filling pipe 17 is used for filling the goaf 9;
(6) And (3) drilling and mining by an auger: when the spiral drilling machine 1 drills, firstly, the spiral drilling machine 1 is oriented, then, the coal seam on the upper side of the single roadway 8 is drilled and mined in an inclined direction, the drill bit 11 of the spiral drilling machine 1 longitudinally pushes coal cutting, the spiral drill rod 2 draws coal, after the completion, the direction of the spiral drilling machine 1 is turned to the lower side, the coal seam on the lower side is drilled and mined, namely, the coal on the two sides of the single roadway 8 is mined;
(7) Coal dropping and coal conveying steps: after the spiral drill rod 2 draws out coal, the coal directly falls on the scraper conveyor 3 on the same side as the drilled hole 12 to convey the coal to a production area;
(8) Advancing the spiral drilling machine: after the steps (1) - (7) are completed, a single roadway 8 is driven forwards, the spiral drilling machine 1 and the spiral drilling rod 2 are separated, the spiral drilling rod 2 is conveyed to a next drilling site by using the monorail crane 6 on the same side as the spiral drilling rod 2, then the spiral drilling machine 1 is moved to the next drilling site along the single roadway 8, and the assembly work of the spiral drilling machine 1 and the spiral drilling rod 2 is completed at the next site;
(9) Goaf treatment steps: constructing a sealing wall body 5 at the edge of the goaf 9, wherein the thickness of the sealing wall body 5 is determined according to the gas pressure of the goaf 9; in addition, when the sealing wall body 5 is constructed, filling holes 18 and exhaust holes 19 are reserved on the left side and the right side above the sealing wall body 5, a carbon dioxide injection hole 4 is reserved on the right side below the sealing wall body 5, the carbon dioxide injection hole 4 is closed firstly, the filling holes 18 and the exhaust holes 19 are opened, and the filling pipe 17 penetrates through the filling holes 18; conveying the slurry prepared in the step (2) to the goaf 9 on two sides of the single roadway 8 through a filling pipeline 16 and a filling pipe 17, compacting, filling hydration liquid into the compacted filler through the filling pipeline 16 for hydration, then filling carbon dioxide waste gas into the hydrated filler, and sequentially driving the original air of the goaf 9 through a gas conveying pipe 14, a gas compression pump 13, a high-pressure pipe 15 and a carbon dioxide injection hole 4 by carbon dioxide, and discharging the original air of the goaf 9 out of the goaf 9 through an exhaust hole 19; when the concentration of the carbon dioxide discharged from the exhaust hole 19 reaches a preset value, stopping introducing the carbon dioxide waste gas, and sealing the filling hole 18 and the exhaust hole 19 to realize geological storage of the carbon dioxide and reinforcement of the goaf 9;
(10) Roadway support step: after the spiral drilling machine 1 advances, a supporting structure is arranged at a drilling position on the spiral drilling machine 1 in time;
(11) And (2) to (10) are filling drilling and mining cycles, so that the filling drilling and mining are carried out along with the tunneling forward, and an isolated coal pillar is reserved between adjacent drilling goafs until the mining of the mining area is completed.
Further, in the step (1), the thickness of the thin coal layer is 0.8-1.3 m.
Further, in the step (2), the prepared filling slurry has the characteristics of good fluidity, fast coagulation, micro expansion, fast early strength development and high strength.
Further, in the step (2), the inclination angle, that is, the inclination angle of the coal seam is ±15°, and the inclination angle of the coal seam can be enlarged to ±25° with the drilling length reduced.
Further, in the step (2), the cross-sectional area of the single roadway 8 is not smaller than 9 square meters.
Further, in the step (3), a distance of the lagging heading face 7 is 20m, and the specific value is determined by the roof pressure and the goaf width in the actual mining engineering.
Further, in the step (9), in order to ensure the efficient performance of the coal mining operation, when the coal mining operation with the downward coal seam is completed, the filling and solidification of the paste with the upward trend are completed simultaneously, and when the paste reaches the required strength, the subsequent coal mining operation and the filling operation of the goaf are carried out;
the foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the principles of the present invention, and such modifications and improvements should also be considered as the scope of the present invention.
Claims (7)
1. The method for mining the thin coal seam drilling machine by bidirectional forward filling and sealing carbon dioxide is characterized by comprising the following steps of:
(1) Preparation work before exploitation: prospecting mine geological conditions to obtain parameters of coal seam geological structure data such as coal seam inclination angle, coal seam thickness, roof lithology, roof pressure, coal seam burial depth and the like, and then selecting a machine type and a supporting mode to determine the width of an isolated coal pillar so as to ensure that roof does not collapse;
(2) The preparation step of filling slurry: crushing solid waste such as coal gangue, waste concrete and the like on the ground surface, and then adding cement and water according to a certain proportion to prepare filling slurry;
(3) Mining working face layout: selecting a thin coal seam development area in the delineated coal mining area, carrying out overall layout on a mining working face, and digging a single roadway in the middle part of the coal seam and supporting; arranging a spiral drilling machine in a single tunnel, fixedly supporting the spiral drilling machine on a coal wall by using hydraulic pressure, delaying a tunneling surface by a certain distance, and enabling the machine body direction to be parallel to the tunnel direction; the two scraper conveyors are respectively arranged on the left side and the right side of the single tunnel bottom plate, the number of the monorail cranes is two, and the two scraper conveyors are respectively arranged on the left side and the right side of the single tunnel top plate;
(4) Carbon dioxide transportation pipeline layout step: the carbon dioxide transportation pipeline consists of two gas compression pumps, two gas conveying pipes and two high-pressure pipes, wherein the gas compression pumps, the gas conveying pipes and the high-pressure pipes are respectively arranged at bottom plates at two sides of a roadway and positioned between the side wall of a single roadway and the scraper conveyor;
(5) Filling pipeline layout: arranging filling pipelines at parallel positions on two sides of a single roadway and above a drill hole, and arranging filling pipes at positions, close to the goaf, of the filling pipelines, wherein the filling pipes are used for filling the goaf;
(6) And (3) drilling and mining by an auger: when the spiral drilling machine drills, firstly, the spiral drilling machine is oriented, then, the coal seam on the upper side of a single roadway is drilled and mined in an inclined direction, a drill bit of the spiral drilling machine longitudinally pushes coal cutting, a spiral drill rod draws coal, after the completion, the direction of the spiral drilling machine is turned to the lower side, the coal seam on the lower side is drilled and mined, and namely, the coal on the two sides of the roadway is mined;
(7) Coal dropping and coal conveying steps: after the coal is drawn out by the spiral drill rod, the coal directly falls on a scraper conveyor on the same side as the drilled hole, and the coal is conveyed to a production area;
(8) Advancing the spiral drilling machine: after the steps (1) - (7) are completed, tunneling the single tunnel forwards, separating the spiral drilling machine from the spiral drilling rod, conveying the spiral drilling rod to a next drilling site by using an overhead monorail crane on the same side as the spiral drilling rod, then moving the spiral drilling machine to the next drilling site along the single tunnel, and completing assembly work of the spiral drilling machine and the spiral drilling rod at the next site;
(9) Goaf treatment steps: constructing a sealing wall body at the edge of the goaf, wherein the thickness of the sealing wall body is determined according to the gas pressure of the goaf; in addition, when the sealing wall is constructed, a filling hole and an exhaust hole are reserved on the left side and the right side above the sealing wall respectively, a carbon dioxide injection hole is reserved on the right side below the sealing wall, the carbon dioxide injection hole is closed first, the filling hole and the exhaust hole are opened, and the filling pipe penetrates through the filling hole; conveying the slurry prepared in the step (2) into goafs on two sides of a single roadway through a filling pipeline and a filling pipe, compacting, then injecting hydration liquid into the compacted filler through the filling pipeline for hydration, then closing a filling hole, opening a carbon dioxide injection hole, injecting carbon dioxide waste gas into the hydrated filler, and sequentially driving original air in the goafs through a gas conveying pipe, a gas compression pump, a high-pressure pipe and the carbon dioxide injection hole by carbon dioxide and discharging the original air out of the goafs through an exhaust hole; when the concentration of the carbon dioxide discharged from the exhaust hole reaches a preset value, stopping introducing the carbon dioxide waste gas, and sealing the filling hole and the exhaust hole to realize geological storage of the carbon dioxide and reinforcement of the goaf;
(10) Roadway support step: after the spiral drilling machine advances, a supporting structure is arranged at a drilling position on the spiral drilling machine in time;
(11) And (2) to (10) are filling drilling and mining cycles, so that the filling drilling and mining are carried out along with the tunneling forward, and an isolated coal pillar is reserved between adjacent drilling goafs until the mining of the mining area is completed.
2. The method for double-forward filling mining and carbon dioxide sequestration of a thin coal seam drilling machine according to claim 1, wherein in the step (1), the thickness of the thin coal seam is 0.8-1.3 m.
3. The method for bi-directional forward filling exploitation and carbon dioxide sequestration of a thin coal seam drilling machine according to claim 1, wherein the filling slurry prepared in the step (2) has the characteristics of good fluidity, fast coagulation, micro expansion, fast early strength development and high strength.
4. The method for double-forward filling mining and carbon dioxide sequestration of a thin seam drilling machine according to claim 1, wherein in the step (2), the inclination angle, i.e. the inclination angle of the coal seam is + -15 degrees, and the inclination angle of the coal seam can be enlarged to + -25 degrees under the condition of reducing the drilling length.
5. The method for mining and sealing carbon dioxide by bi-directional forward filling of a thin coal seam drilling machine according to claim 1, wherein in the step (2), the cross-sectional area of a single roadway is not less than 9 square meters.
6. The method for double-forward filling mining and carbon dioxide sequestration of a thin seam drilling machine according to claim 1, wherein in the step (3), a distance of a lagging heading face is 20m, and the specific values are determined by roof pressure and goaf width in actual mining engineering.
7. The method for mining and sealing carbon dioxide by bi-directional forward filling of a thin seam drilling machine according to claim 1, wherein in the step (9), in order to ensure the efficient progress of the coal mining operation, the filling and solidification of the paste which tends to be upward are completed simultaneously when the coal mining operation which tends to be downward is completed, and the subsequent filling operation of the coal mining operation and goaf is performed after the paste reaches the required strength.
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