AU2020102243A4 - A system and method for preventing and controlling a coal goaf fire - Google Patents
A system and method for preventing and controlling a coal goaf fire Download PDFInfo
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- AU2020102243A4 AU2020102243A4 AU2020102243A AU2020102243A AU2020102243A4 AU 2020102243 A4 AU2020102243 A4 AU 2020102243A4 AU 2020102243 A AU2020102243 A AU 2020102243A AU 2020102243 A AU2020102243 A AU 2020102243A AU 2020102243 A4 AU2020102243 A4 AU 2020102243A4
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- goaf
- pipe
- gas
- air intake
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- 239000003245 coal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 179
- 238000002347 injection Methods 0.000 claims abstract description 146
- 239000007924 injection Substances 0.000 claims abstract description 146
- 239000011261 inert gas Substances 0.000 claims abstract description 66
- 238000012545 processing Methods 0.000 claims abstract description 46
- 239000007787 solid Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 20
- 230000002265 prevention Effects 0.000 abstract description 13
- 238000005065 mining Methods 0.000 abstract description 8
- 238000011160 research Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000013000 chemical inhibitor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- E21F17/18—Special adaptations of signalling or alarm devices
-
- 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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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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)
- Earth Drilling (AREA)
- Traffic Control Systems (AREA)
Abstract
The embodiments of the present invention disclose a system and method for preventing and
controlling a coal goaf fire, and relate to the technical field of coal mining research. The present
invention improves the fire prevention and control effect in the entire goaf area. The system
includes a drag pipe inert injection device, used to inject an inert gas into a goaf on an air intake
side; a surface borehole inert injection device, used to inject an inert gas into a goaf on a return air
side; an air intake side data acquisition device, used to acquire a first temperature and a first index
gas concentration in the air intake side goaf; a return air side data acquisition device, used to
acquire a second temperature and a second index gas concentration in the return air side goaf; and
a data processing device, connected to the above devices respectively, and used to control an inert
injection speed of the drag pipe inert injection device according to the first temperature and the
first index gas concentration, and to control an inert injection speed of the surface borehole inert
injection device according to the second temperature and the second index gas concentration. The
invention is mainly used to prevent and control a coal goaf fire.
DRAWINGS
device 8
Ground
-7
Return air
roda o7 Ot
Wokig O o0QQ%2 eturn air
side goaf
Working
face
ir O
Side vaf 0
Air intake 0 1
roaway 6 0 0
FIG. 1
Description
8 device
Ground
-7 Return air roda o7 Ot
Wokig eturn air O o0QQ%2 side goaf Working face
ir O Side vaf 0 Air intake 0 1 roaway 6 0 0
FIG. 1
SYSTEM AND METHOD FOR PREVENTING AND CONTROLLING COAL GOAF FIRE TECHNICAL FIELD The present invention relates to the technical field of coal mining research, in particular to a system and method for preventing and controlling a coal goaf fire. BACKGROUND With the increasing mechanization of mining, the coal mining industry has seen increasing development and intensity, followed with increasingly large formed goafs. Gas usually accumulates in the goaf. When the return air flow and the gas on the working face (upper corner) exceed the limit, it is easy to cause spontaneous combustion of coal in the goaf, and even to cause a gas explosion accident in severe cases. This affects the economic benefits of the coal mine, and seriously affects the safety production of the mine. At present, measures such as inert injection, grouting, and spraying of chemical inhibitors are often used to deal with spontaneous combustion of coal in the goaf. Among them, the inert injection measure has a simple process and a good inerting effect, and has been widely used in field practice. The current drag pipe inert injection process system is mainly disposed on the air intake side of the goaf. However, due to the "0" ring effect, it is difficult for the inert gas injected by the drag pipe to diffuse to the return air side, resulting in a poor inerting effect in the goaf on the return air side and a poorfire prevention and control effect in the entire goaf area. SUMMARY In view of this, the embodiments of the present invention provide a system and method for preventing and controlling a coal goaf fire. The present invention improves thefire prevention and control effect in the entire goaf area. One embodiment of the present invention provides a system for preventing and controlling a coal goaf fire, including: a drag pipe inert injection device, connected with a data processing device, and used to inject an inert gas into a goaf on an air intake side; a surface borehole inert injection device, connected to the data processing device, and used to inject an inert gas into a goaf on a return air side; an air intake side data acquisition device, connected to the data processing device, and used to acquire a first temperature and a first index gas concentration in the air intake side goaf, and send the first temperature and the first index gas concentration to the data processing device; a return air side data acquisition device, connected to the data processing device, and used to acquire a second temperature and a second index gas concentration in the return air side goaf, and send the second temperature and the second index gas concentration to the data processing device; and the data processing device, used to receive the first temperature and the first index gas concentration, and control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration, and also used to receive the second temperature and the second index gas concentration, and control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration. Optionally, the drag pipe inert injection device includes a first inert generation device, a first control valve and a first inert gas pipe; a first end of the first control valve is connected to the inert generation device, a second end of the first control valve is connected to the first inert gas pipe, and a control end of the first control valve is connected to the data processing device; the surface borehole inert injection device includes a second inert generation device, a second control valve and a second inert gas pipe connected in sequence; a first end of the second control valve is connected to the inert generation device, a second end of the second control valve is connected to the second inert gas pipe, and a control end of the second control valve is connected to the data processing device. Optionally, the air intake side data acquisition device includes more than one first temperature acquisition device and more than one first index gas acquisition device; the return air side data acquisition device includes more than one second temperature acquisition device and more than one second index gas acquisition device. Optionally, the system further includes a gas drainage device and a casing; the casing includes an outer pipe and an inner pipe located in the outer pipe; one end of the inner pipe is connected with an inert outlet of the surface borehole inert injection device; one end of the outer pipe facing away from an inert outlet of the inner pipe is connected with the gas drainage device. Optionally, the system further includes a gas concentration monitor and a lifting device; the gas concentration monitor is connected to a gas drainage port of the gas drainage device or the outer pipe; the lifting device is connected with the inner pipe. Optionally, one end of the outer pipe connected to the gas drainage device is a solid pipe, and the other end thereof is a hollow pipe. Optionally, more than one through hole is evenly spaced in a circumferential direction of the hollow pipe, and an opening rate of the hollow pipe gradually increases from top to bottom. Optionally, the opening rate of the hollow pipe close to the solid pipe is 0.3% to 0.4%, and the opening rate of the hollow pipe far away from the solid pipe is 0.7% to 0.8%. Another embodiment of the present invention provides a method for preventing and controlling a coal goaf fire, based on the system for preventing and controlling a coal goaf fire as described in Embodiment 1, including: disposing a drag pipe inert injection device in an air intake roadway, disposing an inert outlet of the drag pipe inert injection device close to a side wall of a goaf on an air intake side, and using the drag pipe inert injection device to inject an inert gas into the air intake side goaf; extending an inert outlet of a surface borehole inert injection device into a surface borehole of a goaf on a return air side, and using the surface borehole inert injection device to inject an inert gas into the return air side goaf; disposing an air intake side data acquisition device in the air intake roadway in the air intake side goaf, and using the air intake side data acquisition device to acquire a first temperature and a first index gas concentration in the air intake side goaf; disposing a return air side data acquisition device in a return air roadway in the return air side goaf, and using the return air side data acquisition device to acquire a second temperature and a second index gas concentration in the return air side goaf; and using a data processing device to control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration, and to control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration. Optionally, the drag pipe inert injection device includes a first inert gas pipe and the surface borehole inert injection device includes a second inert gas pipe; in this case, the method further includes: enabling one end of the first inert gas pipe away from a first control valve to pass through the air intake roadway and extend into the air intake side of the air intake side goaf; and enabling one end of the second inert gas pipe away from a second control valve to extend into the surface borehole of the return air side goaf. Optionally, the air intake side data acquisition device includes more than one first temperature acquisition device and more than one first index gas acquisition device; the return air side data acquisition device includes more than one second temperature acquisition device and more than one second index gas acquisition device; in this case, the method further includes: evenly spacing the more than one first temperature acquisition device in a length direction of the air intake roadway in the air intake side goaf, and evenly spacing the more than one first index gas acquisition device in the length direction of the air intake roadway in the air intake side goaf; evenly spacing the more than one second temperature acquisition device in a length direction of the return air roadway in the return air side goaf, and evenly spacing the more than one second index gas acquisition device in the length direction of the return air roadway in the return air side goaf. Optionally, a distance between adjacent first temperature acquisition devices, a distance between adjacent first index gas acquisition devices, a distance between adjacent second temperature acquisition devices and a distance between adjacent second index gas acquisition devices are all 10-20 m. Optionally, the first temperature acquisition device and the first index gas acquisition device are disposed in the air intake roadway and are at a distance of 20-100 m from a working face; the second temperature acquisition device and the second index gas acquisition device are disposed in the return air roadway and are at a distance of 20-100 m from the working face. Optionally, the system includes a gas drainage device and a casing; the casing includes an outer pipe and an inner pipe located in the outer pipe; one end of the inner pipe is connected with an inert outlet of the surface borehole inert injection device; one end of the outer pipe facing away from an inert outlet of the inner pipe is connected with the gas drainage device; in this case, the method further includes: disposing the casing in the surface borehole of the return air side goaf, and extending both the outer pipe and the inner pipe into the return air side goaf. Optionally, the method further includes: draining a gas in the goaf by a space between the outer pipe and the inner pipe when injecting an inert gas into the goaf through the inner pipe. Optionally, in the case of normal operation of the coal goaf, the surface borehole is an abandoned borehole which was used for pre-mining gas drainage, an inert injection speed of the surface borehole inert injection device is 3-20 m3/min, and a gas drainage speed of the gas drainage device is 20-80 m3/min; in the case of a fire in the coal goaf, the surface borehole is newly constructed based on a location of the fire in the coal goaf, an inert injection speed of the surface borehole inert injection device is 15-30 m3/min, and a gas drainage speed of the gas drainage device is 50-100 m 3/min. Optionally, one end of the inner pipe located in the return air side goaf is disposed at a distance of 0.5-1 m from a floor of the return air side goaf. Optionally, one end of the outer pipe extending into the return air side goaf is disposed at a distance of 3-5 m below an interface between a fracture zone and a caving zone among three zones in a longitudinal direction of the goaf, where the three longitudinal zones include a subsidence zone, the fracture zone and the caving zone from top to bottom. Optionally, one end of the outer pipe connected to the gas drainage device is a solid pipe, and the other end thereof is a hollow pipe; in this case, the method further includes: disposing the solid pipe part of the outer pipe above the interface, and disposing the hollow pipe part of the outer pipe below the interface. Optionally, the system includes a gas concentration monitor and a lifting device; the gas concentration monitor is connected to a gas drainage port of the gas drainage device or the outer pipe; the lifting device is connected with the inner pipe; in this case, the method includes: monitoring a gas concentration at the gas drainage port by using the gas concentration monitor; and lifting the inner pipe upward by 1-2 m by using the lifting device, when the gas concentration monitored by the gas concentration monitor drops by 1% to 3%. Optionally, the using a data processing device to control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration includes: controlling the inert injection speed of the drag pipe inert injection device to increase by a first speed increment, when the first temperature rises by 0.5-1°C or the first index gas concentration increases by 1% to 2%; the using the data processing device to control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration includes: controlling the inert injection speed of the surface borehole inert injection device to increase by a second speed increment, when the second temperature rises by 0.5-1°C or the second index gas concentration increases by 1% to 2%. In the system and method for preventing and controlling a coal goaf fire provided by the embodiments of the present invention, the drag pipe inert injection device injects an inert gas into the air intake side goaf, and the surface borehole inert injection device injects an inert gas into the return air side goaf. In this way, the present invention solves the problem that due to the "0"ring effect, the inert gas injected into the air intake side goaf by the drag pipe inertia injection device is difficult to diffuse to the return air side goaf, resulting in a poor inerting effect on the return air side goaf. Therefore, the present invention improves the fire prevention and control effect in the entire coal goaf area. The air intake side data acquisition device and the return air side data acquisition device respectively monitor the temperature and index gas concentration in the air intake side goaf and the return air side goaf in real time. The data processing device controls the inert injection speed of the drag pipe inert injection device and the surface borehole inert injection device according to the temperature and the index gas concentration in the air intake side goaf and the return air side goaf, respectively. In this way, the present invention realizes the real-time dynamic allocation of the inert injection amount in different areas of the goaf, and realizes the rapid and accurate fire prevention and control in the entire goaf area, thus providing favorable technical guarantee for the safe and efficient production of the mine. BRIEF DESCRIPTION OF DRAWINGS To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the accompanying drawings required for describing the embodiments or the prior art are briefly described below. Apparently, the accompanying drawings in the following description show some examples of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is a schematic diagram showing an operation state of a system for preventing and controlling a coal goaf fire according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing an operation state of a casing according to Embodiment 1 of the present invention. FIG. 3 is a sectional view A-A of FIG. 2. DETAILED DESCRIPTION The embodiments of the present invention are described in detail below with reference to the accompanying drawing. It should be pointed out that the described embodiments are only a part, rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts should fall within the protection scope of the present invention. FIG. 1 shows a system for preventing and controlling a coal goaf fire according to Embodiment 1 of the present invention. As shown in FIG. 1, the system includes: a drag pipe inert injection device 6, connected with a data processing device 4, and used to inject an inert gas into a goaf on an air intake side; a surface borehole inert injection device 8, connected to the data processing device 4, and used to inject an inert gas into a goaf on a return air side; an air intake side data acquisition device 1, connected to the data processing device 4, and used to acquire a first temperature and a first index gas concentration in the air intake side goaf, and send the first temperature and the first index gas concentration to the data processing device 4; a return air side data acquisition device 2, connected to the data processing device 4, and used to acquire a second temperature and a second index gas concentration in the return air side goaf, and send the second temperature and the second index gas concentration to the data processing device 4; and the data processing device 4, used to receive the first temperature and the first index gas concentration, and control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration, and also used to receive the second temperature and the second index gas concentration, and control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration. In this embodiment, a first index gas and a second index gas may include methane, carbon monoxide and carbon dioxide, etc. The drag pipe inert injection device may be disposed in an air intake roadway, and an inert outlet of the drag pipe inert injection device may be disposed close to a side wall of the air intake side goaf. Thus, the drag pipe inert injection device is used to inject an inert gas into the air intake side goaf. The drag pipe inert injection device is mainly used for fire prevention and control in the air intake side goaf, and the inert gas injected by the drag pipe inert injection device has a good inerting effect in the air intake side goaf. As shown in FIG. 1, an inert outlet of the surface borehole inert injection device 8 may extend into a surface borehole in the goaf area on the return air side, so that the surface borehole inert injection device 6 injects an inert gas into the return air side goaf. In this way, the inert gas can be accurately injected into the return air side goaf. This design solves the problem that due to the "0" ring effect, the inert gas injected into the air intake side goaf by the drag pipe inertia injection device is difficult to diffuse to the return air side goaf, resulting in a poor inerting effect on the return air side goaf. Therefore, the present invention improves the fire prevention and control effect in the entire coal goaf area. In the case of normal operation of the coal goaf, the surface borehole is an abandoned borehole which was used for pre-mining gas drainage. After mining starts, the borehole is generally sealed and abandoned. In this embodiment, the surface borehole inert injection device 8 reuses the abandoned borehole, which realizes the secondary utilization of the waste resource and saves the cost of drilling. In the case of a fire in the coal goaf, the surface borehole is newly constructed based on a location of the fire in the coal goaf. Thus, the surface borehole inert injection device 8 can realize the accurate and quick control of the fire. As shown in FIG. 1, the air intake side data acquisition device 1 may be disposed in the air intake roadway in the air intake side goaf, so that the air intake side data acquisition device 1 acquires the first temperature and the first index gas concentration in the air intake side goaf. The return air side data acquisition device 2 may be disposed in a return air roadway in the return air side goaf, so that the return air side data acquisition device 2 acquires the second temperature and the second index gas concentration in the return air side goaf. In the system for preventing and controlling a coal goaf fire provided by the embodiment, the drag pipe inert injection device injects an inert gas into the air intake side goaf, and the surface borehole inert injection device injects an inert gas into the return air side goaf. In this way, the present invention solves the problem that due to the "0" ring effect, the inert gas injected into the air intake side goaf by the drag pipe inertia injection device is difficult to diffuse to the return air side goaf, resulting in a poor inerting effect on the return air side goaf. Therefore, the present invention improves the fire prevention and control effect in the entire coal goaf area. In addition, the air intake side data acquisition device and the return air side data acquisition device respectively monitor the temperature and index gas concentration in the air intake side goaf and the return air side goaf in real time. The data processing device controls the inert injection speed of the drag pipe inert injection device and the surface borehole inert injection device according to the temperature and the index gas concentration in the air intake side goaf and the return air side goaf, respectively. In this way, the present invention realizes the real-time dynamic allocation of the inert injection amount in different areas of the goaf, and realizes the rapid and accurate fire prevention and control in the entire goaf area, thus providing favorable technical guarantee for the safe and efficient production of the mine. System operators only need to stay on the ground, which ensures the safety of personnel. Optionally, the drag pipe inert injection device may include a first inert generation device, a first control valve and a first inert gas pipe. A first end of the first control valve is connected to the inert generation device, a second end of the first control valve is connected to the first inert gas pipe, and a control end of the first control valve is connected to the data processing device. The surface borehole inert injection device includes a second inert generation device, a second control valve and a second inert gas pipe connected in sequence. A first end of the second control valve is connected to the inert generation device, a second end of the second control valve is connected to the second inert gas pipe, and a control end of the second control valve is connected to the data processing device. In this embodiment, the data processing device may control the inert injection speed of the drag pipe inert injection device by controlling the first control valve, and control the inert injection speed of the surface borehole inert injection device by controlling the second control valve. As shown in FIG. 1, it can be understood that the first inert generation device and the second inert generation device may be the same inert generation device, and the first control valve and the second control valve may form a three-way control valve 5. A first end of the three-way control valve 5 is connected to the inert generation device, a second end of the three-way control valve is connected to the first inert gas pipe, a third end of the three-way control valve is connected to the second inert gas pipe, and a control end of the three-way control valve is connected to the data processing device 4. The data processing device 4 can dynamically adjust the three-way control valve 5 according to the fire conditions in different areas of the goaf, so as to realize the real-time dynamic allocation of the inert injection amount to different areas of the goaf. As shown in FIG. 1, optionally, one end of the first inert gas pipe away from a first control valve may pass through the air intake roadway and extend into the air intake side of the air intake side goaf to inject an inert gas. One end of the second inert gas pipe away from a second control valve may extend into a surface borehole of the return air side goaf to inject an inert gas. As shown in FIG. 1, optionally, the air intake side data acquisition device 1 may include more than one first temperature acquisition device and more than one first index gas acquisition device. The return air side data acquisition device 2 includes more than one second temperature acquisition device and more than one second index gas acquisition device. In this embodiment, when the data acquisition device on the air intake side includes more than one first temperature acquisition device, the data acquisition device on the air intake side is further used to send a plurality of first temperatures acquired by each of the first temperature acquisition devices to the data processing device. Similarly, when the data acquisition device on the air intake side includes more than one first index gas acquisition device, the data acquisition device on the air intake side is further used to send a plurality of first index gas concentrations acquired by each of the first index gas acquisition devices to the data processing device. The data processing device comprehensively analyzes the received plurality of first temperatures and the received plurality of first index gas concentrations to control the inert injection speed of the drag pipe inert injection device. The working principle of the data acquisition device on the return air side is the same as above. As shown in FIG. 1, optionally, the first temperature acquisition device and the first index gas acquisition device are disposed in the air intake roadway and are at a distance of 20-100 m from a working face. The more than one first temperature acquisition device is evenly spaced in a length direction of the air intake roadway in the air intake side goaf. The more than one first index gas acquisition device is evenly spaced in the length direction of the air intake roadway in the air intake side goaf. A distance between adjacent first temperature acquisition devices and a distance between adjacent first index gas acquisition devices are both 10-20 m. As shown in FIG. 1, similarly, the second temperature acquisition device and the second index gas acquisition device are disposed in the return air roadway and are at a distance of 20-100 m from the working face. The more than one second temperature acquisition device is evenly spaced in a length direction of the return air roadway in the return air side goaf. The more than one second index gas acquisition device is evenly spaced in the length direction of the return air roadway in the return air side goaf. A distance between adjacent second temperature acquisition devices and a distance between adjacent second index gas acquisition devices are both 10-20 m. As shown in FIGS. 1 and 2, optionally, the system may further include a gas drainage device (not shown in the figure) and a casing 7. The casing 7 includes an outer pipe 7-1 and an inner pipe 7-2 located in the outer pipe 7-1. One end of the inner pipe 7-2 is connected with an inert outlet of the surface borehole inert injection device 8. One end of the outer pipe 7-1 facing away from an inert outlet of the inner pipe 7-2 is connected with the gas drainage device. In this embodiment, the gas drainage device is an existing device. Those skilled in the art can easily connect the gas drainage device with the outer pipe according to the above description, and thus it will not be repeated here. In this embodiment, gas drainage is performed on the basis of fire prevention and control in the goaf. This embodiment requires a small amount of work and low investment, and realizes good drainage of the gas in the goaf and quick control of the fire in the goaf. As shown in FIGS. 1 and 2, the casing 7 may be disposed in the surface borehole of the goaf area on the return air side, and the outer pipe 7-1 and the inner pipe 7-2 both extend into the return air side goaf. When an inert gas is injected into the goaf through the inner pipe 7-2, the gas in the goaf is drained by a space between the outer pipe 7-1 and the inner pipe 7-2. In this way, the inert gas injected by the inner pipe 7-2 can replace the gas in the goaf. Compared with the method of only gas drainage, the present invention improves the gas drainage efficiency. Optionally, a diameter of the outer pipe is 150-400 mm, and a diameter of the inner pipe is -160 mm. The present invention makes full use of the cross-sectional space of the surface borehole, and uses the inert gas injected by the inner pipe to replace the gas in the goaf. In this way, the present invention improves the gas drainage effect of the goaf and realizes the rapid prevention and control of the fire in the goaf. Optionally, in the case of normal operation of the coal goaf, an inert injection speed of the surface borehole inert injection device is 3-20 m3/min, and a gas drainage speed of the gas drainage device is 20-80 m 3/min. In the case of a fire in the coal goaf, an inert injection speed of the surface borehole inert injection device is 15-30 m3/min, and a gas drainage speed of the gas drainage device is 50-100 m 3/min. In this way, the present invention can realize the rapid control of an emergency fire. As shown in FIG. 2, optionally, one end of the outer pipe 7-1 extending into the return air side goaf may be disposed at a distance of 3-5 m below an interface between a fracture zone and a caving zone among three zones in a longitudinal direction of the goaf. This is beneficial for gas drainage. The three longitudinal zones include a subsidence zone, the fracture zone and the caving zone from top to bottom. One end of the inner pipe 7-2 located in the return air side goaf is disposed at a distance of 0.5-1 m from a floor of the return air side goaf. As shown in FIG. 2, as an optional implementation of the above embodiment, a part of the outer pipe 7-1 above the interface is a solid pipe, and a part thereof below the interface is a hollow pipe. More than one through hole is evenly defined in a circumferential direction of the hollow pipe. In this way, the hollow pipe increases the gas drainage area, which is beneficial to the gas drainage in the goaf. Optionally, an opening rate of the hollow pipe gradually increases from top to bottom. The opening rate of the hollow pipe close to the solid pipe is 0.3% to 0.4%, and the opening rate of the hollow pipe far away from the solid pipe is 0.7% to 0.8%. The gas is drawn from the bottom to the top through the outer pipe, and the gas is distributed on the hollow pipe with high concentration at the bottom and low concentration at the top. Therefore, the through holes on the hollow pipe are gradually reduced from bottom to top, so as to improve the efficiency of gas drainage and achieve the purpose of quickly controlling the fire in the goaf. As shown in FIG. 2, optionally, the system further includes a gas concentration monitor 9 and a lifting device 10. The gas concentration monitor 9 is connected to a gas drainage port of the gas drainage device or the outer pipe 7-1. The lifting device 10 is connected with the inner pipe 7-2. In this embodiment, a gas concentration at the gas drainage port may be monitored in real time by the gas concentration monitor. When the gas concentration monitored by the gas concentration monitor drops by 1% to 3%, the inner pipe is lifted upward by 1-2 m by using the lifting device. In this way, the present invention avoids the spatial accumulation of the inert gas in the vertical height of the goaf, and quickly fills the entire goaf with the inert gas, so as to realize the purpose of quickly controlling a fire in the goaf.
As shown in FIGS. 2 and 3, as an optional implementation of the above embodiment, a pipe sliding device 11 may further be disposed between the outer pipe and the inner pipe. The pipe sliding device 11 includes guide rails 11-1 and limiting clamps 11-2 located between the outer pipe 7-1 and the inner pipe 7-2. The guide rail 11-1 is located in the limiting clamp 11-2. The guide rail 11-1 is fixed on the outer pipe 7-1 / inner pipe 7-2. The limiting clamp 11-2 is fixed on the inner pipe 7-2 / outer pipe 7-1. In this embodiment, the pipe sliding device plays a guiding role for the movement of the inner pipe. Optionally, the using a data processing device to control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration includes: controlling the inert injection speed of the drag pipe inert injection device to increase by a first speed increment, when the first temperature rises by 0.5-1°C or the first index gas concentration increases by 1% to 2%; the using the data processing device to control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration includes: controlling the inert injection speed of the surface borehole inert injection device to increase by a second speed increment, when the second temperature rises by 0.5-1°C or the second index gas concentration increases by 1% to 2%. In this embodiment, those skilled in the art can set the original inert injection speed and the first and second speed increments as needed. Embodiment 2 of the present invention provides a method for preventing and controlling a coal goaf fire based on the system for preventing and controlling a coal goaf fire as described in Embodiment 1, including: dispose a drag pipe inert injection device in an air intake roadway, dispose an inert outlet of the drag pipe inert injection device close to a side wall of a goaf on an air intake side, and use the drag pipe inert injection device to inject an inert gas into the air intake side goaf; extend an inert outlet of a surface borehole inert injection device into a surface borehole of a goaf on a return air side, and use the surface borehole inert injection device to inject an inert gas into the return air side goaf; dispose an air intake side data acquisition device in the air intake roadway in the air intake side goaf, and use the air intake side data acquisition device to acquire a first temperature and a first index gas concentration in the air intake side goaf; dispose a return air side data acquisition device in a return air roadway in the return air side goaf, and use the return air side data acquisition device to acquire a second temperature and a second index gas concentration in the return air side goaf; and use a data processing device to control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration, and to control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration. In the method for preventing and controlling a coal goaf fire provided by the embodiment, the drag pipe inert injection device injects an inert gas into the air intake side goaf, and the surface borehole inert injection device injects an inert gas into the return air side goaf. In this way, the present invention solves the problem that due to the "0" ring effect, the inert gas injected into the air intake side goaf by the drag pipe inertia injection device is difficult to diffuse to the return air side goaf, resulting in a poor inerting effect on the return air side goaf. Therefore, the present invention improves the fire prevention and control effect in the entire coal goaf area. In addition, the air intake side data acquisition device and the return air side data acquisition device respectively monitor the temperature and index gas concentration in the air intake side goaf and the return air side goaf in real time. The data processing device controls the inert injection speed of the drag pipe inert injection device and the surface borehole inert injection device according to the temperature and the index gas concentration in the air intake side goaf and the return air side goaf, respectively. In this way, the present invention realizes the real-time dynamic allocation of the inert injection amount in different areas of the goaf, and realizes the rapid and accurate fire prevention and control in the entire goaf area, thus providing favorable technical guarantee for the safe and efficient production of the mine. Optionally, the drag pipe inert injection device includes a first inert gas pipe and the surface borehole inert injection device includes a second inert gas pipe; in this case, the method further includes: enable one end of the first inert gas pipe away from a first control valve to pass through the air intake roadway and extend into the air intake side of the air intake side goaf; and enable one end of the second inert gas pipe away from a second control valve to extend into the surface borehole of the return air side goaf. Optionally, the air intake side data acquisition device includes more than one first temperature acquisition device and more than one first index gas acquisition device; the return air side data acquisition device includes more than one second temperature acquisition device and more than one second index gas acquisition device; in this case, the method further includes: evenly space the more than one first temperature acquisition device in a length direction of the air intake roadway in the air intake side goaf, and evenly space the more than one first index gas acquisition device in the length direction of the air intake roadway in the air intake side goaf; evenly space the more than one second temperature acquisition device in a length direction of the return air roadway in the return air side goaf, and evenly space the more than one second index gas acquisition device in the length direction of the return air roadway in the return air side goaf. Optionally, a distance between adjacent first temperature acquisition devices, a distance between adjacent first index gas acquisition devices, a distance between adjacent second temperature acquisition devices and a distance between adjacent second index gas acquisition devices are all 10-20 m.
Optionally, the first temperature acquisition device and the first index gas acquisition device are disposed in the air intake roadway and are at a distance of 20-100 m from a working face; the second temperature acquisition device and the second index gas acquisition device are disposed in the return air roadway and are at a distance of 20-100 m from the working face. Optionally, the system includes a gas drainage device and a casing; the casing includes an outer pipe and an inner pipe located in the outer pipe; one end of the inner pipe is connected with an inert outlet of the surface borehole inert injection device; one end of the outer pipe facing away from an inert outlet of the inner pipe is connected with the gas drainage device; in this case, the method further includes: dispose the casing in the surface borehole of the return air side goaf, and extend both the outer pipe and the inner pipe into the return air side goaf. Optionally, the method further includes: drain a gas in the goaf by a space between the outer pipe and the inner pipe when injecting an inert gas into the goaf through the inner pipe. Optionally, in the case of normal operation of the coal goaf, the surface borehole is an abandoned borehole which was used for pre-mining gas drainage, an inert injection speed of the surface borehole inert injection device is 3-20 m3/min, and a gas drainage speed of the gas drainage device is 20-80 m3/min; in the case of a fire in the coal goaf, the surface borehole is newly constructed based on a location of the fire in the coal goaf, an inert injection speed of the surface borehole inert injection device is 15-30 m3/min, and a gas drainage speed of the gas drainage device is 50-100 m3/min. Optionally, one end of the inner pipe located in the return air side goaf is disposed at a distance of 0.5-1 m from a floor of the return air side goaf. Optionally, one end of the outer pipe extending into the return air side goaf is disposed at a distance of 3-5 m below an interface between a fracture zone and a caving zone among three zones in a longitudinal direction of the goaf, where the three longitudinal zones include a subsidence zone, the fracture zone and the caving zone from top to bottom. Optionally, one end of the outer pipe connected to the gas drainage device is a solid pipe, and the other end thereof is a hollow pipe; in this case, the method further includes: dispose the solid pipe part of the outer pipe above the interface, and dispose the hollow pipe part of the outer pipe below the interface. Optionally, the system includes a gas concentration monitor and a lifting device; the gas concentration monitor is connected to a gas drainage port of the gas drainage device or the outer pipe; the lifting device is connected with the inner pipe; in this case, the method includes: monitor a gas concentration at the gas drainage port by using the gas concentration monitor; and lift the inner pipe upward by 1-2 m by using the lifting device, when the gas concentration monitored by the gas concentration monitor drops by 1% to 3%.
Optionally, the using a data processing device to control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration includes: control the inert injection speed of the drag pipe inert injection device to increase by a first speed increment, when the first temperature rises by 0.5-1C or the first index gas concentration increases by 1% to 2%; the using the data processing device to control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration includes: control the inert injection speed of the surface borehole inert injection device to increase by a second speed increment, when the second temperature rises by 0.5-1°C or the second index gas concentration increases by 1% to 2%. It should be noted that, in this specification, relationship terms such as "first" and "second" are only used to distinguish an entity or operation from another entity or operation, but do not necessarily require or imply that there is any actual relationship or order between these entities or operations. In addition, terms "include", "comprise", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, a method, an article, or a device including a series of elements not only includes those elements, but also includes other elements that are not explicitly listed, or also includes inherent elements of the process, the method, the article, or the device. Without more restrictions, the elements defined by the sentence "including a ... " do not exclude the existence of other identical elements in the process, method, article, or device including the elements. The above described are merely specific implementations of the present invention, and the protection scope of the present invention is not limited thereto. Any modification or replacement easily conceived by those skilled in the art within the technical scope of the present invention should fall within the protection scope of the present invention. Therefore, the protection scope of the disclosure should be subject to the protection scope of the claims.
Claims (10)
- What is claimed is: 1. A system for preventing and controlling a coal goaf fire, comprising: a drag pipe inert injection device, connected with a data processing device, and used to inject an inert gas into a goaf on an air intake side; a surface borehole inert injection device, connected to the data processing device, and used to inject an inert gas into a goaf on a return air side; an air intake side data acquisition device, connected to the data processing device, and used to acquire a first temperature and a first index gas concentration in the air intake side goaf, and send the first temperature and the first index gas concentration to the data processing device; a return air side data acquisition device, connected to the data processing device, and used to acquire a second temperature and a second index gas concentration in the return air side goaf, and send the second temperature and the second index gas concentration to the data processing device; and the data processing device, used to receive the first temperature and the first index gas concentration, and control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration, and also used to receive the second temperature and the second index gas concentration, and control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration.
- 2. The system according to claim 1, wherein the drag pipe inert injection device comprises a first inert generation device, a first control valve and a first inert gas pipe; a first end of the first control valve is connected to the inert generation device, a second end of the first control valve is connected to the first inert gas pipe, and a control end of the first control valve is connected to the data processing device; the surface borehole inert injection device comprises a second inert generation device, a second control valve and a second inert gas pipe connected in sequence; a first end of the second control valve is connected to the inert generation device, a second end of the second control valve is connected to the second inert gas pipe, and a control end of the second control valve is connected to the data processing device.
- 3. The system according to claim 1, wherein the air intake side data acquisition device comprises more than one first temperature acquisition device and more than one first index gas acquisition device; the return air side data acquisition device comprises more than one second temperature acquisition device and more than one second index gas acquisition device.
- 4. The system according to claim 1, wherein the system further comprises a gas drainage device and a casing; the casing comprises an outer pipe and an inner pipe located in the outer pipe; one end of the inner pipe is connected with an inert outlet of the surface borehole inert injection device; one end of the outer pipe facing away from an inert outlet of the inner pipe is connected with the gas drainage device.
- 5. The system according to claim 4, wherein the system further comprises a gas concentration monitor and a lifting device; the gas concentration monitor is connected to a gas drainage port of the gas drainage device or the outer pipe; the lifting device is connected with the inner pipe.
- 6. The system according to claim 4, wherein one end of the outer pipe connected to the gas drainage device is a solid pipe, and the other end thereof is a hollow pipe.
- 7. The system according to claim 6, wherein more than one through hole is evenly spaced in a circumferential direction of the hollow pipe, and an opening rate of the hollow pipe gradually increases from top to bottom.
- 8. The system according to claim 7, wherein the opening rate of the hollow pipe close to the solid pipe is 0.3% to 0.4%, and the opening rate of the hollow pipe far away from the solid pipe is 0. 7 %to 0. 8 %.
- 9. A method for preventing and controlling a coal goaf fire, based on the system for preventing and controlling a coal goaf fire according to any one of claims 1 to 8, and comprising: disposing a drag pipe inert injection device in an air intake roadway, disposing an inert outlet of the drag pipe inert injection device close to a side wall of a goaf on an air intake side, and using the drag pipe inert injection device to inject an inert gas into the air intake side goaf; extending an inert outlet of a surface borehole inert injection device into a surface borehole of a goaf on a return air side, and using the surface borehole inert injection device to inject an inert gas into the return air side goaf; disposing an air intake side data acquisition device in the air intake roadway in the air intake side goaf, and using the air intake side data acquisition device to acquire a first temperature and a first index gas concentration in the air intake side goaf; disposing a return air side data acquisition device in a return air roadway in the return air side goaf, and using the return air side data acquisition device to acquire a second temperature and a second index gas concentration in the return air side goaf; and using a data processing device to control an inert injection speed of the drag pipe inert injection device according to the first temperature and the first index gas concentration, and to control an inert injection speed of the surface borehole inert injection device according to the second temperature and the second index gas concentration.
- 10. The method according to claim 9, wherein the drag pipe inert injection device comprises a first inert gas pipe and the surface borehole inert injection device comprises a second inert gas pipe; in this case, the method further comprises: enabling one end of the first inert gas pipe away from a first control valve to pass through the air intake roadway and extend into the air intake side of the air intake side goaf; and enabling one end of the second inert gas pipe away from a second control valve to extend into the surface borehole of the return air side goaf.
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| CN201910916209.5 | 2019-09-25 | ||
| CN201910916209.5A CN110714797B (en) | 2019-09-25 | 2019-09-25 | System and method for preventing and controlling fire in coal goaf |
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| CN112879074A (en) * | 2021-04-07 | 2021-06-01 | 安徽理工大学 | Positive and negative pressure inert injection method and system for rapid fire prevention and extinguishing in goaf |
| CN113863989A (en) * | 2021-10-29 | 2021-12-31 | 安徽理工大学 | Extremely-close coal seam group mining closed goaf coal spontaneous combustion monitoring and early warning method |
| CN113931682A (en) * | 2021-10-27 | 2022-01-14 | 彬县水帘洞煤炭有限责任公司 | Multi-disaster combined prevention and control system used before coal seam mining on high-gas low-lying island working face |
| CN114320455A (en) * | 2021-12-28 | 2022-04-12 | 中国矿业大学(北京) | Intelligent inert injection cooling fire prevention system for goaf under coal mining condition and implementation method |
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| JPH084364Y2 (en) * | 1989-09-12 | 1996-02-07 | 株式会社東海理化電機製作所 | Airbag safety device |
| RU2293184C1 (en) * | 2005-08-19 | 2007-02-10 | Открытое акционерное общество "Ольжерасское Шахтопроходческое Управление" | Method for inertization of face space |
| CN102809394B (en) * | 2012-07-30 | 2013-12-25 | 辽宁工程技术大学 | Method for determining air-leakage rate of oxidized zone of goaf |
| CN106194171B (en) * | 2016-08-11 | 2018-04-03 | 安徽宏昌机电装备制造有限公司 | A kind of adaptivity digging all-in-one |
| CN106247168B (en) * | 2016-09-08 | 2018-07-17 | 西安科技大学 | The conveying device and carrying method of surface drilling fire extinguishing liquid carbon dioxide |
| CN207960662U (en) * | 2018-02-27 | 2018-10-12 | 中国神华能源股份有限公司 | A kind of carbon dioxide injection mine goaf system |
| CN208172542U (en) * | 2018-05-14 | 2018-11-30 | 山西潞安环保能源开发股份有限公司 | Goaf linkage note nitrogen energy-saving control system |
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- 2019-09-25 CN CN201910916209.5A patent/CN110714797B/en active Active
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| CN112879074A (en) * | 2021-04-07 | 2021-06-01 | 安徽理工大学 | Positive and negative pressure inert injection method and system for rapid fire prevention and extinguishing in goaf |
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| CN113931682B (en) * | 2021-10-27 | 2024-03-22 | 彬县水帘洞煤炭有限责任公司 | High-gas low-lying island working face coal seam pre-mining multi-disaster combined control system |
| CN113863989A (en) * | 2021-10-29 | 2021-12-31 | 安徽理工大学 | Extremely-close coal seam group mining closed goaf coal spontaneous combustion monitoring and early warning method |
| CN113863989B (en) * | 2021-10-29 | 2024-03-01 | 安徽理工大学 | Coal spontaneous combustion monitoring and early warning method for closed goaf of extremely close coal seam group mining |
| CN114320455A (en) * | 2021-12-28 | 2022-04-12 | 中国矿业大学(北京) | Intelligent inert injection cooling fire prevention system for goaf under coal mining condition and implementation method |
| CN114575914A (en) * | 2022-03-30 | 2022-06-03 | 西安科技大学 | Nitrogen injection method for underground fire prevention and extinguishment |
Also Published As
| Publication number | Publication date |
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| CN110714797B (en) | 2021-04-13 |
| CN110714797A (en) | 2020-01-21 |
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