CN113250733B - Goaf gas recycling fire prevention and extinguishing system and control method - Google Patents
Goaf gas recycling fire prevention and extinguishing system and control method Download PDFInfo
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- CN113250733B CN113250733B CN202110632293.5A CN202110632293A CN113250733B CN 113250733 B CN113250733 B CN 113250733B CN 202110632293 A CN202110632293 A CN 202110632293A CN 113250733 B CN113250733 B CN 113250733B
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- 238000004064 recycling Methods 0.000 title claims abstract description 21
- 230000002265 prevention Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 117
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 86
- 230000005540 biological transmission Effects 0.000 claims abstract description 61
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 43
- 239000003245 coal Substances 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 35
- 239000007924 injection Substances 0.000 claims abstract description 35
- 239000003063 flame retardant Substances 0.000 claims abstract description 33
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005065 mining Methods 0.000 claims description 17
- 239000008259 solid foam Substances 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 230000002269 spontaneous effect Effects 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 2
- 239000006260 foam Substances 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000014075 nitrogen utilization Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002699 waste material Substances 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention discloses a goaf gas recycling fire prevention and extinguishing system and a control method, and the goaf gas recycling fire prevention and extinguishing system comprises a gas transmission pipeline, a gas return pipeline, a flame retardant system, an air flow blocking system and a gas generating device, wherein the gas transmission pipeline comprises a gas transmission main pipe and a gas transmission branch pipe, the gas return pipeline comprises a gas suction main pipe and an upright post branch pipe, and the gas transmission main pipe and the gas suction main pipe are formed by connecting multiple sections of straight pipes through a three-way valve; the flame retardant system comprises a flame retardant box, a flame retardant pipeline, a water injection pipe and an injection head, wherein a section of the water injection pipe, which is parallel to the flame retardant pipeline, is connected with a plurality of injection heads; the wind flow blocking system consists of a hydraulic support and a coal gangue pile, wherein gaps of the hydraulic support are blocked by foam; the gas generating device comprises a nitrogen production unit, a nitrogen workstation and a gas recovery device, and the part is arranged in the roadway. The whole system is simple in structure, continuous in working process and high in efficiency, and the occurrence rate of spontaneous combustion fire in the goaf can be greatly reduced.
Description
Technical Field
The invention relates to a fire preventing and extinguishing system suitable for preventing spontaneous combustion of a goaf under a coal mine.
Background
Spontaneous combustion fire of coal mines is one of major disasters of coal mines in China and even the world, and prevention and control of underground spontaneous combustion fire is a key problem concerned by coal industries in China. The coal mine spontaneous combustion fire hazard is extremely large, the extinguishing difficulty is high, not only can cause huge coal resource waste, but also can cause underground equipment damage, so that an underground system is paralyzed, and further the life safety of underground workers is endangered.
At present, nitrogen injection fire prevention and extinguishing in a goaf is one of the main measures for preventing spontaneous combustion of the goaf in China, nitrogen is sent into an oxidation zone of the goaf, air in the fire zone is exhausted, and the oxygen concentration is reduced, so that the effect of inhibiting spontaneous combustion of coal in the oxidation zone is achieved. The most common nitrogen injection method at present is a buried pipe nitrogen injection method, and specifically, after a nitrogen injection pipeline is buried into a goaf for a certain length, nitrogen injection is started, a second nitrogen injection pipeline is prepared to be laid, when the second nitrogen injection pipeline is laid at a contact part of a goaf heat dissipation zone and an oxidation zone, nitrogen injection to the goaf is started, nitrogen injection to the first pipeline is stopped, a third nitrogen injection pipeline is prepared to be laid, and the process is circulated until the working face is completely mined. Because the traditional method is small in nitrogen injection area, nitrogen is injected by adopting a single pipeline, and nitrogen is slowly diffused, the oxygen concentration of the goaf cannot be quickly reduced, and air enters the goaf when the working face is normally supplied with air, so that the possibility of spontaneous combustion fire in the goaf is increased, and in addition, the traditional method also has the problem of low nitrogen utilization rate.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the prior art, the goaf gas recycling fire prevention and extinguishing system and the control method are provided, and the occurrence rate of spontaneous combustion fire in the goaf is reduced.
The technical scheme is as follows: a goaf gas recycling fire prevention and extinguishing system comprises a gas transmission pipeline, a gas return pipeline, a flame retardant system, a wind flow blocking system and a gas generating device;
the gas transmission pipeline comprises a gas transmission main pipe and gas transmission branch pipes, the gas transmission main pipe is respectively arranged in an air inlet main lane and an air return main lane of the fully mechanized face, the gas transmission main pipe is formed by connecting a plurality of sections of gas transmission straight pipes through first three-way valves, a third interface of each first three-way valve is connected with the gas transmission branch pipes through first L-shaped short pipes and right-angle joints, the gas transmission branch pipes are arranged along the width direction of the goaf, and the gas transmission branch pipes are distributed at intervals;
the air return pipeline comprises an air suction main pipe and upright post branch pipes, the air suction main pipe is respectively arranged in an air inlet main lane and an air return main lane of the fully mechanized mining surface, the air suction main pipe is formed by connecting a plurality of sections of air return straight pipes through a second three-way valve, a third interface of each second three-way valve is connected with a second L-shaped short pipe, a plurality of upright post branch pipes distributed at intervals are connected onto the second L-shaped short pipes, the top of each upright post branch pipe is connected with a conical top, a plurality of air suction holes are formed in the bottom end surface of the conical top, and the total height of the upright post branch pipes and the conical top is close to the mining height;
the flame retardant system comprises a flame retardant box, a flame retardant pipeline and a water injection pipe, wherein the output end of the flame retardant box is connected with the flame retardant pipeline, the flame retardant pipeline is arranged along the width direction of the goaf, the position of the water injection pipe, which is parallel to the flame retardant pipeline, is connected with a plurality of injection heads, and the injection heads are vertically upward;
the wind flow blocking system comprises coal gangue piles stacked at the upper corner and the lower corner of the fully mechanized mining surface, and the coal gangue piles fill gaps by spraying solid foam to form a tuyere isolation wall;
the gas generating device comprises a nitrogen production unit and a gas recovery device, the gas transmission main pipe is connected with the nitrogen production unit, and the gas suction main pipe is connected with the gas recovery device.
Further, the horizontal distance between a first three-way valve in the main gas transmission pipe and a gas transmission branch pipe connected with the first three-way valve is 50 m; the interval between the air conveying branch pipes of the air inlet main roadway and the air return main roadway of the same mining and goaf area is 20-22 m.
Furthermore, a plurality of filter screens are arranged in the stand column branch pipes, and the middle positions of the stand column branch pipes on each second L-shaped short pipe are opposite to the gas transmission branch pipe on the other side of the fully mechanized face.
Furthermore, the height of the coal gangue pile is close to the mining height, and the coal gangue piles positioned at the upper corner and the lower corner are arranged oppositely.
Furthermore, a plurality of gas injection holes are arranged on the gas transmission branch pipe at intervals, and the gas injection holes are back to the coal face.
Furthermore, solid foam is adopted to block gaps of hydraulic supports of an air inlet main roadway and an air return main roadway of the fully mechanized mining face.
A control method of a goaf gas recycling fire prevention and extinguishing system is adopted, wherein the gas transmission branch pipe and an upright post branch pipe are arranged in a goaf area formed after a coal face moves, a gangue pile and a flame retardant system are arranged, then nitrogen input to the goaf area formed after the previous coal face moves through the gas transmission branch pipe is stopped, and nitrogen in the goaf area formed after the previous coal face moves is recovered through the upright post branch pipe and used in a new goaf area formed at present, so that recycling of the nitrogen is formed.
Has the advantages that: according to the goaf gas recycling fire prevention and extinguishing system and the control method, the gas transmission pipeline and the gas return pipeline are used in combination with the nitrogen production unit and the gas recovery device to realize recycling of nitrogen; the gas transmission branch pipes are arranged in a staggered manner through the air inlet main lane and the air return main lane of the fully mechanized mining surface, so that the diffusion range of nitrogen is expanded, and the possibility of fire in a goaf is reduced; the quantity of the upright post branch pipes is increased, so that the recovery speed of nitrogen is improved, and the gas circulation speed is accelerated.
1. The nitrogen can be recycled, the utilization rate of the nitrogen is improved, and the cost is saved;
2. by adopting a plurality of branches and injecting nitrogen into a plurality of air holes, the diffusion speed of the nitrogen is accelerated, and the oxygen concentration in the area can be quickly reduced;
3. the gas environment of the goaf can be monitored in real time, and spontaneous combustion fire can be effectively prevented;
4. and the possibility of spontaneous combustion of the goaf is greatly reduced by adopting the combined action of the inert gas and the flame retardant.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the structure of a column manifold in the system of the present invention;
FIG. 3 is a schematic view of the bottom surface configuration of the conical tip in the system of the present invention;
FIG. 4 is a schematic structural view of a filter net arranged in a pillar branch pipe;
FIG. 5 is a schematic structural view of a gas delivery branch pipe with gas injection holes.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in figure 1, the goaf gas recycling fire prevention and extinguishing system comprises a gas transmission pipeline, a gas return pipeline, a flame retardant system, a wind flow blocking system and a gas generating device.
The gas transmission pipeline comprises a gas transmission main pipe 1 and gas transmission branch pipes 3, the gas transmission main pipe 1 is respectively arranged in an air inlet main lane 11 and an air return main lane 12 of the fully mechanized face, the gas transmission main pipe 1 is formed by connecting multiple sections of gas transmission straight pipes through first three-way valves 10-1, a third interface of each first three-way valve 10-1 is connected with the gas transmission branch pipes 3 through first L-shaped short pipes 17-1 and right-angle joints 18, the gas transmission branch pipes 3 are arranged along the width direction of the goaf, and the gas transmission branch pipes 3 are distributed at intervals. The horizontal distance between the first three-way valve 10-1 in the gas transmission main pipe 1 and the gas transmission branch pipe 3 connected with the first three-way valve is 50 m; the length of the gas transmission branch pipe 3 is about three fifths of the width of the goaf; the interval between the air conveying branch pipes 3 of the air inlet main lane 11 and the air return main lane 12 in the same mining area is 20-22 m. As shown in FIG. 5, a plurality of gas injection holes 16 are arranged on the gas transmission branch pipe 3 at intervals, and in order to prevent rock fall from damaging the gas holes, when the gas transmission branch pipe 3 is installed, the gas injection holes 16 face away from the coal face.
The air return pipeline comprises an air suction main pipe 2 and upright post branch pipes 4, the air suction main pipe 2 is respectively arranged in an air inlet main roadway 11 and an air return main roadway 12 of the fully mechanized face, the air suction main pipe 2 is formed by connecting multiple sections of air return straight pipes through second three-way valves 10-2, a third interface of each second three-way valve 10-2 is connected with a second L-shaped short pipe 17-2, and the second L-shaped short pipe 17-2 is connected with six upright post branch pipes 4 which are distributed at intervals. As shown in fig. 2 to 4, the top of each pillar branch pipe 4 is connected with a conical top 13, four air suction holes 14 are uniformly formed in the bottom end face of the conical top 13, the total height of the pillar branch pipes 4 and the conical top 13 is close to the mining height, and one side, close to the wall, of the conical top 13 is tightly attached to the wall of the fully mechanized mining face to protect the pillar branch pipes 4 from being damaged by falling rocks. In order to prevent dust or rock powder from entering the air return pipeline, a plurality of filter screens 15 are arranged in the upright post branch pipes 4, and the middle positions of the six upright post branch pipes 4 on each second L-shaped short pipe 17-2 are opposite to the air conveying branch pipe 3 on the other side of the fully mechanized face.
The flame retardant system comprises a flame retardant box 6, a flame retardant pipeline 7 and a water injection pipe 8, wherein the output end of the flame retardant box 6 is connected with the flame retardant pipeline 7, the flame retardant pipeline 7 is arranged along the width direction of a goaf, the position of the water injection pipe 8, which is parallel to the flame retardant pipeline 7, is connected with a plurality of injection heads 9, the injection heads 9 are vertically upward, and a water wall is formed during working.
The wind flow blocking system comprises coal gangue piles 5 stacked at the upper corner and the lower corner of the fully mechanized mining surface, the height of each coal gangue pile 5 is close to the mining height, the coal gangue piles 5 positioned at the upper corner and the lower corner are arranged oppositely, and the coal gangue piles 5 are sprayed with solid foam to fill gaps to form a wind gap isolation wall. Meanwhile, solid foam is adopted to block gaps of the hydraulic supports of the air inlet main lane 11 and the air return main lane 12 of the fully mechanized mining face. The air current blocking system mainly has the functions of blocking air blown from the roadway and reducing the possibility of fire in the goaf.
The gas generating device comprises a nitrogen production unit, a gas recovery device and a nitrogen workstation, a gas transmission main pipe 1 is connected with the nitrogen production unit, a gas suction main pipe 2 is connected with the gas recovery device, and the nitrogen production unit and the gas recovery device are only connected with the nitrogen workstation.
A control method of a goaf gas recycling fire prevention and extinguishing system is adopted, wherein a gas transmission branch pipe 3 and an upright post branch pipe 4 are arranged in a goaf area formed after a coal face moves, a coal gangue pile 5 and a flame retardant system are arranged, then nitrogen input to the goaf area formed after the previous coal face moves through the gas transmission branch pipe 3 is stopped, and nitrogen in the goaf area formed after the previous coal face moves is recovered through the upright post branch pipe 4 and used for a new goaf area formed at present, the oxygen concentration of the goaf is reduced, and the nitrogen recycling is formed.
In the system, the gas transmission branch pipe 3 and the upright post branch pipe 4 are connected through the L-shaped short pipe and the three-way valve, so that the opening and closing of corresponding pipelines in a goaf area formed after the previous coal face moves can be controlled conveniently on the current coal face, and the accurate control of nitrogen injection and absorption in the goaf is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A goaf gas recycling fire prevention and extinguishing system is characterized by comprising a gas transmission pipeline, a gas return pipeline, a flame retardant system, a wind flow blocking system and a gas generating device;
the gas transmission pipeline comprises a gas transmission main pipe (1) and gas transmission branch pipes (3), the gas transmission main pipe (1) is respectively arranged on an air inlet main lane (11) and an air return main lane (12) of a fully mechanized mining surface, the gas transmission main pipe (1) is formed by connecting a plurality of sections of gas transmission straight pipes through first three-way valves (10-1), a third interface of each first three-way valve (10-1) is connected with the gas transmission branch pipes (3) through first L-shaped short pipes (17-1) and right-angle joints (18), the gas transmission branch pipes (3) are arranged along the width direction of a goaf, and the gas transmission branch pipes (3) are distributed at intervals;
the air return pipeline comprises an air suction main pipe (2) and upright post branch pipes (4), the air suction main pipe (2) is respectively arranged on an air inlet main roadway (11) and an air return main roadway (12) of the fully mechanized face, the air suction main pipe (2) is formed by connecting a plurality of sections of air return straight pipes through second three-way valves (10-2), a third interface of each second three-way valve (10-2) is connected with a second L-shaped short pipe (17-2), the second L-shaped short pipe (17-2) is connected with a plurality of upright post branch pipes (4) distributed at intervals, the top of each upright post branch pipe (4) is connected with a conical top (13), a plurality of air suction holes (14) are formed in the bottom end face of the conical top (13), and the total height of the upright post branch pipes (4) and the conical tops (13) is close to the mining height;
the flame retardant system comprises a flame retardant box (6), a flame retardant pipeline (7) and a water injection pipe (8), wherein the output end of the flame retardant box (6) is connected with the flame retardant pipeline (7), the flame retardant pipeline (7) is arranged along the width direction of a goaf, the position of the water injection pipe (8) parallel to the flame retardant pipeline (7) is connected with a plurality of injection heads (9), and the injection heads (9) are vertically upward;
the wind flow blocking system comprises coal gangue piles (5) stacked at the upper corner and the lower corner of the fully mechanized coal mining surface, and the coal gangue piles (5) fill gaps by spraying solid foam to form a wind gap isolation wall;
the gas generating device comprises a nitrogen production unit and a gas recovery device, the gas transmission main pipe (1) is connected with the nitrogen production unit, and the gas suction main pipe (2) is connected with the gas recovery device.
2. The goaf gas recycling fire prevention and extinguishing system according to claim 1, wherein the horizontal distance between a first three-way valve (10-1) in the main gas transmission pipe (1) and the gas transmission branch pipe (3) connected thereto is 50 m; the interval between the gas transmission branch pipes (3) of the air inlet main lane (11) and the air return main lane (12) in the same mining area is 20-22 m.
3. The goaf gas recycling fire prevention and extinguishing system according to claim 1, wherein a plurality of filter screens (15) are arranged in the upright branch pipes (4), and the middle positions of a plurality of upright branch pipes (4) on each second L-shaped short pipe (17-2) are opposite to the gas transmission branch pipe (3) on the other side of the fully mechanized face.
4. A goaf gas recycling fire prevention and extinguishing system according to claim 1, wherein the height of the coal gangue piles (5) is close to the goaf height, and the coal gangue piles (5) at the upper and lower corners are arranged facing each other.
5. The goaf gas recycling fire prevention and extinguishing system according to claim 1, wherein a plurality of gas injection holes (16) are arranged on the gas transmission branch pipes (3) at intervals, and the gas injection holes (16) face away from a coal face.
6. The goaf gas recycling fire prevention and extinguishing system according to claim 1, wherein gaps between hydraulic supports of the air intake main lane (11) and the air return main lane (12) of the fully mechanized face are blocked by solid foam.
7. A control method of a goaf gas recycling fire prevention and extinguishing system is characterized in that the goaf gas recycling fire prevention and extinguishing system according to any one of claims 1 to 6 is adopted, wherein the gas transmission branch pipes (3) and the stand pipe pipes (4) are arranged in a goaf area formed after the coal face moves, the coal gangue pile (5) and the fire retardant system are arranged, then the input of nitrogen into a goaf area formed after the previous coal face moves through the gas transmission branch pipes (3) is stopped, and the recovery of nitrogen in the goaf area formed after the previous coal face moves through the stand pipe pipes (4) is started, so that the nitrogen can be recycled in a new goaf area formed at present.
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