CN113863989B - Coal spontaneous combustion monitoring and early warning method for closed goaf of extremely close coal seam group mining - Google Patents
Coal spontaneous combustion monitoring and early warning method for closed goaf of extremely close coal seam group mining Download PDFInfo
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- CN113863989B CN113863989B CN202111272101.0A CN202111272101A CN113863989B CN 113863989 B CN113863989 B CN 113863989B CN 202111272101 A CN202111272101 A CN 202111272101A CN 113863989 B CN113863989 B CN 113863989B
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- 239000003245 coal Substances 0.000 title claims abstract description 100
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 86
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 79
- 238000012544 monitoring process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005065 mining Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000005336 cracking Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000004044 response Effects 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 44
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000000700 radioactive tracer Substances 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000004587 chromatography analysis Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910020314 ClBr Inorganic materials 0.000 claims description 2
- 230000036760 body temperature Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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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)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a method for monitoring and early warning spontaneous combustion of coal in a closed goaf in extremely close coal seam group exploitation, and relates to the technical field of coal mine fire control. Detecting air leakage conditions of a closed goaf group in the exploitation of a very close coal seam, and dividing a common spontaneous combustion hidden danger area and a serious spontaneous combustion hidden danger area according to the air leakage conditions; carrying out coal spontaneous combustion parameter test in an air leakage area, optimizing index gas, and dividing coal spontaneous combustion into four early warning grades according to a coal self-heating stage, a spontaneous combustion critical stage, a cracking stage and a combustion stage according to coal temperature and the index gas; and monitoring the temperature and the gas composition of the coal in the air leakage area, and determining the early warning grade of the area. And adopting corresponding response measures according to different early warning grades. According to the invention, the safety of coal mining is improved by monitoring and early warning the mined area in the process of mining the extremely-short-distance coal seam group.
Description
Technical Field
The invention belongs to the technical field of coal mine fire prevention and control, and particularly relates to a method for monitoring and early warning spontaneous combustion of coal in a closed goaf mined by a very close coal seam group.
Background
In the process of mining the extremely-short-distance coal seam, because the intervals between the coal seam layers are close, the coal seam layers are mutually influenced, a crack channel is easily formed between the upper coal seam and the lower coal seam, and air leakage from the main coal seam to the sealed goaf of the coal seam is caused, so that a plurality of coal-missing spontaneous combustion dangerous areas are formed. The safety recovery of the coal seam working face is seriously threatened. The existing coal spontaneous combustion early warning method is mainly aimed at the working face of the coal seam being mined, and at present, researches on the closed goaf coal spontaneous combustion monitoring and early warning technology in the extremely-short-distance coal seam group mining process are not available. CN201610065635.9 relates to a method for judging and early warning the spontaneous combustion risk degree of goaf coal based on index gas, which carries out early warning on spontaneous combustion of goaf coal on the working face under exploitation by arranging measuring points in the goaf.
Disclosure of Invention
The invention aims to provide a method for monitoring and early warning spontaneous combustion of coal in a closed goaf of extremely-short-distance coal seam group mining, which is used for monitoring and early warning an already-mined area in the extremely-short-distance coal seam group mining process, so that the safety of coal mine mining is improved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for monitoring and early warning spontaneous combustion of coal in a closed goaf in extremely close coal seam mining, which comprises the following steps of monitoring air leakage of the closed goaf in extremely close coal seam mining; dividing a common spontaneous combustion hidden danger area and a serious spontaneous combustion hidden danger area according to the air leakage condition; carrying out coal spontaneous combustion parameter test in the air leakage area, and dividing coal spontaneous combustion into four early warning grades according to the coal body temperature and index gas and the coal body self-heating stage, the spontaneous combustion critical stage, the cracking stage and the combustion stage;
and a single-point monitoring mode is adopted for a general natural hidden danger area, a dense monitoring mode is adopted for a severe spontaneous combustion hidden danger area, the temperature and gas components of the coal body in the air leakage area are monitored, and the early warning grade of the area is determined.
Monitoring the temperature and gas composition of the coal in the air leakage area, and determining the early warning grade according to the temperature of the coal and the index gas.
According to the difference of the early warning grades, adopting corresponding response measures:
during the self-heating stage of the coal body: nitrogen is injected into the area with the hidden danger of spontaneous combustion;
at the spontaneous combustion critical stage: injecting nitrogen into the spontaneous combustion hidden danger area, injecting nitrogen into the spontaneous combustion danger area, and injecting liquid carbon dioxide into the local abnormal point in the spontaneous combustion danger area;
during the cracking stage: plugging the end, injecting water and injecting liquid carbon dioxide to quickly perform pressure equalizing and fire extinguishing;
combustion stage: closing the panel.
The common spontaneous combustion hidden trouble area is monitored by adopting a single-point monitoring mode:
and embedding a beam tube in a general spontaneous combustion hidden danger area through a sealing wall and a goaf, collecting a gas sample by adopting a negative pressure sampler, and analyzing the gas component by using a chromatograph.
Monitoring the severe spontaneous combustion hidden danger area by adopting a dense monitoring mode:
and (3) constructing an observation drilling hole near the severe spontaneous combustion hidden danger area, arranging a drilling hole at the end position of the drilling hole in the severe spontaneous combustion hidden danger area every 20 multiplied by 20m < 2 > -50 multiplied by 50m < 2 >, taking gas from the drilling hole by adopting a negative pressure sampler, analyzing gas components by using chromatography, and simultaneously arranging a temperature probe in the drilling hole to monitor the temperature of the coal in the severe spontaneous combustion hidden danger area.
And detecting the closed goaf in the exploitation process of the extremely close coal seam group by using a tracer gas method to monitor air leakage.
The tracer gas method adopts a double tracer gas method, and the gases are SF6 and CF2ClBr respectively.
The invention has the following beneficial effects:
the invention is that
Detecting a closed goaf in the exploitation process of the extremely close coal seam group by a tracer gas method to perform air leakage monitoring, dividing different hidden danger areas, and determining the spontaneous combustion early warning level of the coal by adopting different monitoring modes and monitoring the gas and the temperature of the hidden danger areas; the method can accurately and timely judge the spontaneous combustion condition of the coal in the sealed goaf, is provided with corresponding solutions aiming at different early warning grades, has a good spontaneous combustion prevention and control effect of the coal, and further improves the safety during coal exploitation.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of spontaneous combustion monitoring and early warning of coal in a closed goaf of extremely close coal seam group mining;
FIG. 2 is a schematic diagram of trace gas release points and partial sample point position distribution;
FIG. 3 is a schematic diagram of trace gas release points and partial sample point position distribution;
fig. 4 is a schematic diagram of the location distribution of dense monitoring points.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Please refer to fig. 1-4:
taking mining of a mining area 1 coal group of a mine 2201 as an example. The distance thickness between 1 coal and 1 upper coal seam is 1.1m, which belongs to the exploitation of the extremely short distance coal seam group, and when the 1 coal is exploited, the spontaneous combustion of the residual coal in the goaf with the 1 upper coal sealed is easily caused. Aiming at the situation, the method for monitoring and early warning the spontaneous combustion of the coal in the closed goaf mined by the extremely close coal seam group is used.
S10: detecting the air leakage condition of the closed goaf group in the exploitation process of the extremely close coal seam group by using a tracer gas method;
detecting a closed goaf in the exploitation process of the extremely-close coal seam group by using a tracer gas method to monitor air leakage;
preferably, the tracer gas method adopts a double tracer gas method, and the gases are SF respectively 6 And CF (compact F) 2 ClBr。
And selecting 2 release sites, uniformly releasing two trace gases, specifically selecting goaf group sealing walls and positions of drilling measuring points of the sealing goaf to collect gas samples, and arranging release points and sampling points in the mining area as shown in figures 2 and 3.
And analyzing the gas components by using a gas chromatograph, and determining the air leakage channel and the air leakage quantity of the goaf group according to the concentration of the trace gas and the detection time.
S20: according to the air leakage condition of the goaf and the distribution condition of the residual coal, determining a general spontaneous combustion hidden danger area and a serious spontaneous combustion hidden danger area;
the air leakage condition includes whether air leakage and the magnitude of the air leakage intensity.
Wherein, generally spontaneous combustion hidden danger area: the air leakage intensity is less than 0.1m 3 /(min·m 3 ) The goaf with less coal pillar or coal is a common spontaneous combustion hidden trouble area.
Severe autoignition hazard zone: the air leakage intensity is 0.1-0.24 m 3 /(min·m 3 ) Is a goaf region where a large amount of residual coal exists.
The general spontaneous combustion hidden danger areas of the mining area are judged to be 220112 and 220108 goafs, and the serious spontaneous combustion hidden danger area is judged to be 220116 goafs.
S40, taking a coal sample, testing the spontaneous combustion parameters of the coal, optimizing the spontaneous combustion index gas of the coal, and determining a spontaneous combustion early warning mechanism of the coal;
the method comprises the steps of adopting a single-point monitoring mode for a general natural hidden danger area, and adopting a dense monitoring mode for a serious spontaneous combustion hidden danger area.
Further, the intensive monitoring mode monitors the coal spontaneous combustion dangerous area:
constructing observation drilling holes near the spontaneous combustion dangerous area, wherein the terminal positions of the drilling holes are in the spontaneous combustion dangerous area of coal, and each 20 multiplied by 20m 2 ～50×50m 2 A drill hole is arranged, a negative pressure sampler is adopted to take gas from the drill hole, gas components are analyzed by chromatography, and meanwhile, a temperature probe is arranged in the drill hole to monitor the temperature of coal in the spontaneous combustion dangerous area.
The dense monitoring points are arranged, and are particularly 220116 goaf dense monitoring points shown in fig. 4. Further, the single point monitoring mode monitors the general spontaneous combustion hidden trouble area:
and embedding a beam tube in a general spontaneous combustion hidden danger area through a sealing wall and a goaf, collecting a gas sample by adopting a negative pressure sampler, and analyzing the gas component by using a chromatograph.
S50, determining early warning grades according to the monitoring data, and adopting different response measures aiming at different early warning grades.
Specifically, according to coal material parameters of the air leakage area, an early warning mechanism of the air leakage area is selected;
monitoring the temperature of the coal body in the air leakage area, and determining the early warning grade according to the temperature of the coal body, wherein the coal body is in a self-heating stage, a spontaneous combustion critical stage, a cracking stage and a combustion stage.
Further, according to the difference of the early warning grades, adopting corresponding response measures:
during the self-heating stage of the coal body: nitrogen is injected into the area with the hidden danger of spontaneous combustion;
at the spontaneous combustion critical stage: injecting nitrogen into the spontaneous combustion hidden danger area, injecting nitrogen into the spontaneous combustion danger area, and injecting liquid carbon dioxide into the local abnormal point in the spontaneous combustion danger area;
during the cracking stage: plugging the end, injecting water and injecting liquid carbon dioxide to quickly perform pressure equalizing and fire extinguishing;
combustion stage: closing the panel.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (3)
1. The method for monitoring and early warning spontaneous combustion of the coal in the closed goaf of the extremely close coal seam group exploitation is characterized by comprising the following steps of:
in the exploitation of the extremely close coal seam, monitoring the air leakage condition of the closed goaf group; dividing a common spontaneous combustion hidden danger area and a serious spontaneous combustion hidden danger area according to the air leakage condition; carrying out coal spontaneous combustion parameter test in the air leakage area, and dividing coal spontaneous combustion into four early warning grades according to the coal body temperature and index gas and the coal body self-heating stage, the spontaneous combustion critical stage, the cracking stage and the combustion stage;
according to the difference of the early warning grades, adopting corresponding response measures:
during the self-heating stage of the coal body: nitrogen is injected into the area with the hidden danger of spontaneous combustion;
at the spontaneous combustion critical stage: injecting nitrogen into the spontaneous combustion hidden danger area, injecting nitrogen into the spontaneous combustion danger area, and injecting liquid carbon dioxide into the local abnormal point in the spontaneous combustion danger area;
during the cracking stage: plugging the end, injecting water and injecting liquid carbon dioxide to quickly perform pressure equalizing and fire extinguishing;
combustion stage: closing the mining area;
a single-point monitoring mode is adopted for a general natural hidden danger area, a dense monitoring mode is adopted for a severe spontaneous combustion hidden danger area, the temperature and gas components of coal in an air leakage area are monitored, and the early warning grade of the area is determined;
embedding a beam tube in a general spontaneous combustion hidden danger area through a sealing wall and a goaf, collecting a gas sample by adopting a negative pressure sampler, and analyzing gas components by using chromatography;
constructing observation drilling holes near the severe spontaneous combustion hidden danger area, wherein the terminal positions of the drilling holes are positioned in the severe spontaneous combustion hidden danger area, and each 20 multiplied by 20m 2 ～50×50m 2 Arranging a drill hole, taking gas from the drill hole by adopting a negative pressure sampler, analyzing gas components by using chromatography, and simultaneously arranging a temperature probe in the drill hole to monitor the temperature of the coal in the region with serious spontaneous combustion hidden danger;
and detecting the closed goaf in the exploitation process of the extremely close coal seam group by using a tracer gas method to monitor air leakage.
2. The method for monitoring and early warning the spontaneous combustion of coal in a closed goaf of extremely close coal seam group mining according to claim 1, wherein the temperature and the gas composition of the coal body in the air leakage area are monitored, and the early warning level is determined according to the temperature of the coal body and the index gas.
3. The method for monitoring and early warning spontaneous combustion of coal in closed goaf in extremely close coal seam mining according to claim 2, wherein the tracer gas method adopts a double tracer gas method, and the gases are SF respectively 6 And CF (compact F) 2 ClBr。
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