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CN-122014321-A - Goaf nitrogen injection fire prevention and extinguishing device

CN122014321ACN 122014321 ACN122014321 ACN 122014321ACN-122014321-A

Abstract

The invention relates to the technical field of goaf fire prevention and extinguishment, and discloses a goaf nitrogen injection fire prevention and extinguishment device which comprises a nitrogen injection pipeline, a plurality of high-pressure rubber pipes, a plurality of pre-buried pipe bodies and a movable gas injection group, wherein the input ends of the high-pressure rubber pipes are fixedly connected with the nitrogen injection pipeline, the pre-buried pipe bodies are respectively and fixedly connected with the output ends of the high-pressure rubber pipes, channels are formed in the pre-buried pipe bodies, through hole groups are arranged outside the channels at equal intervals, a protection group is arranged outside the through hole groups, and the movable gas injection group is arranged inside the through hole groups. According to the invention, high-pressure and low-temperature nitrogen is injected into the embedded pipe body, so that the arc protection plates and the side arc protection plates can be opened and the piston column is pushed out, thereby realizing nitrogen injection, and when gangue collapses in the nitrogen injection process, the top arc protection plate and the two side arc protection plates can form a protection effect on the outer side of the movable gas injection group, and the inclined gas injection hole is prevented from being directly extruded by the gangue collapses, and particles invade or impact load, so that the ventilation of nitrogen gas can be ensured.

Inventors

  • YU XUELEI
  • Niu Youzhi
  • QIN RUXIANG
  • YANG HU
  • CHEN YAO
  • SHI QIANKUN
  • YI ZHIGANG
  • WANG YUAN
  • Cai Lianze
  • LU SIYUAN

Assignees

  • 淮北矿业股份有限公司

Dates

Publication Date
20260512
Application Date
20250917

Claims (9)

  1. 1. The nitrogen injection fire prevention and extinguishing device for the goaf comprises a nitrogen injection pipeline (100) positioned outside the goaf, and is characterized by further comprising: The high-pressure rubber pipes (200) are fixedly connected with the nitrogen injection pipeline (100), and one end, close to the nitrogen injection pipeline (100), is an input end, and one end, far away from the nitrogen injection pipeline (100), is an output end; The high-pressure hose comprises a plurality of embedded pipes (300), wherein the embedded pipes are respectively and fixedly connected to the output ends of the high-pressure hoses (200) and are located in goafs, channels (310) are formed in the embedded pipes (300), through hole groups (320) are formed in the channels (310) at equal intervals, a protection group (330) is arranged outside the through hole groups (320), and movable gas injection groups (340) are arranged in the through hole groups (320).
  2. 2. The goaf nitrogen injection fire prevention and extinguishing device according to claim 1, wherein a flow sensor and a flow controller are installed at one end of the nitrogen injection pipeline (100) close to the plurality of high-pressure rubber pipes (200), and high-pressure nitrogen equipment is arranged at one end of the nitrogen injection pipeline (100) far away from the plurality of high-pressure rubber pipes (200).
  3. 3. The goaf nitrogen injection fire prevention and extinguishing device according to claim 2, wherein each pre-buried pipe body (300) is composed of a sealing section (350) and an air injection section (360) which are communicated with each other, and a channel (310) inside the sealing section (350) is in an outward expansion shape at one end far away from the air injection section (360).
  4. 4. A goaf nitrogen injection fire prevention and extinguishing device according to claim 3, characterized in that the through hole group (320) comprises a top through hole (321) vertical to the ground surface direction and two side through holes (322) parallel to the ground surface direction, the top through hole (321) and the two side through holes (322) are vertically communicated with the channel (310), and the two side through holes (322) are symmetrically distributed with the channel (310) as the center.
  5. 5. The nitrogen injection fire prevention and extinguishing device for goafs according to claim 4, wherein the protection group (330) comprises a top arc protection plate (331) rotatably connected to the outside of the top through hole (321), and two side arc protection plates (332) rotatably connected to the outside of the two side through holes (322), respectively, and the two side arc protection plates (332) are symmetrically distributed around the channel (310).
  6. 6. The goaf nitrogen injection fire prevention and extinguishing device according to claim 5, wherein the protection group (330) comprises three U-shaped frames (333) fixedly connected to the outside of the gas injection section (360), and the top arc protection plate (331) and the two side arc protection plates (332) are respectively connected to the outside of the gas injection section (330) through the three U-shaped frames (333) in a rotating mode.
  7. 7. The goaf nitrogen injection fire prevention and extinguishing device according to claim 6, wherein limiting grooves (334) are formed in inner sides of the top arc protection plate (331) and the two side arc protection plates (332), built-in grooves (335) are formed in outer sides of each U-shaped frame (333), a trapezoid limiting block (336) matched with the limiting grooves (334) is connected inside the built-in grooves (335) in a sliding mode, and a pushing spring (337) is fixedly connected between the trapezoid limiting block (336) and the built-in grooves (335).
  8. 8. The goaf nitrogen injection fire prevention and extinguishing device according to claim 7, wherein the movable gas injection group (340) comprises a piston column (341) located inside a top through hole (321) and two side through holes (322), and a semi-arc ventilation slot (342) communicated with the top through hole (321) and the two side through holes (322), one end, far away from the channel (310), of the piston column (341) is arc-shaped, an L-shaped ventilation slot (343) is formed in one side, close to the semi-arc ventilation slot (342), of the piston column (341), and an oblique gas injection hole (344) communicated with the L-shaped ventilation slot (343) is formed in one side, far away from the semi-arc ventilation slot (342), of the piston column (341).
  9. 9. The nitrogen injection fire prevention and extinguishing device for goafs according to claim 8, wherein the gas injection directions of the inclined gas injection holes (344) adjacent to the inner side of the top arc protection plate (331) are opposite, and the gas injection directions of the inclined gas injection holes (344) adjacent to the inner side of the side arc protection plate (332) are the same.

Description

Goaf nitrogen injection fire prevention and extinguishing device Technical Field The invention relates to the technical field of goaf fire prevention and extinguishment, in particular to a goaf nitrogen injection fire prevention and extinguishment device. Background Safe and efficient coal mining is a key for guaranteeing stable coal supply, underground conditions are complex, and various disasters can occur in the coal mining process. The mine fire disaster is most frequently happened, and the mine fire disaster caused by spontaneous combustion of coal accounts for 85% -90% of the total fire disaster. Along with the continuous improvement of the advancing speed of the coal face, the amount of residual coal in the goaf is increased, so that the possibility of spontaneous combustion of coal is increased rapidly. At present, the goaf nitrogen injection fire prevention and extinguishing technology is one of main measures for preventing spontaneous combustion of the goaf. The most commonly used nitrogen injection method in the nitrogen injection fire prevention technology is a buried pipe nitrogen injection method, and nitrogen injection can be realized by arranging nitrogen production equipment in a roadway and conveying high-pressure low-temperature nitrogen into a buried flower pipe through a nitrogen injection pipeline. The high-pressure and low-temperature nitrogen injected into the goaf can quickly reduce the temperature and the oxygen concentration in the local space, and the necessary condition of spontaneous combustion of coal is cut off from the source. In the process of realizing nitrogen injection and fire prevention and extinguishment of the goaf through the buried pipe nitrogen injection method, the gas injection holes on the embedded flower pipes are directly exposed in the goaf, so that the gas injection holes are very easy to become weak points for gangue collapse and impact, further the problems of bending deformation of the embedded flower pipes and blocking of the holes of the gas injection holes are caused, namely, the gas injection holes are very easy to damage the structural integrity of the embedded flower pipes or block the flow path of nitrogen when being directly extruded, particles invade or impact load caused by gangue collapse. Disclosure of Invention The invention provides a goaf nitrogen injection fire prevention and extinguishing device, which solves the technical problems that in the prior art, when a gas injection hole on a pre-buried flower pipe is collapsed by gangue, the structural integrity of the pre-buried flower pipe is easily damaged or a nitrogen flow path can be blocked. The invention provides a goaf nitrogen injection fire prevention and extinguishing device which comprises a nitrogen injection pipeline positioned outside a goaf, a plurality of high-pressure rubber pipes, a plurality of embedded pipe bodies, a plurality of through hole groups, a protection group and a movable gas injection group, wherein one end, close to the nitrogen injection pipeline, is an input end, and one end, far away from the nitrogen injection pipeline, is an output end, the input ends of the high-pressure rubber pipes are fixedly connected with the nitrogen injection pipeline, the embedded pipe bodies are respectively and fixedly connected with the output ends of the high-pressure rubber pipes and positioned in the goaf, the embedded pipe bodies are respectively provided with channels, the through hole groups are arranged outside the channels at equal intervals, and the movable gas injection group is arranged inside the through hole groups. Preferably, the one end that annotates the nitrogen pipeline and be close to a plurality of high-pressure rubber pipes all installs flow sensor and flow controller, the one end that annotates the nitrogen pipeline and keep away from a plurality of high-pressure rubber pipes is provided with high-pressure nitrogen equipment. Preferably, each embedded pipe body is composed of a sealing section and an air injection section which are mutually communicated, and one end, far away from the air injection section, of a channel inside the sealing section is in an outward expansion shape. Preferably, the through hole group comprises a top through hole vertical to the earth surface direction and two side through holes parallel to the earth surface direction, wherein the top through hole and the two side through holes are vertically communicated with the channel, and the two side through holes are symmetrically distributed with the channel as the center. Preferably, the protection group comprises a top arc protection plate which is rotationally connected to the outside of the top through hole, and two side arc protection plates which are respectively rotationally connected to the outside of the two side through holes, wherein the two side arc protection plates are symmetrically distributed by taking the channel as the center. Preferably, the protection group compri