CN111350547B - Natural ignition monitoring method for coal in rock-gate airtight area for coal mining by layers - Google Patents
Natural ignition monitoring method for coal in rock-gate airtight area for coal mining by layers Download PDFInfo
- Publication number
- CN111350547B CN111350547B CN202010158407.2A CN202010158407A CN111350547B CN 111350547 B CN111350547 B CN 111350547B CN 202010158407 A CN202010158407 A CN 202010158407A CN 111350547 B CN111350547 B CN 111350547B
- Authority
- CN
- China
- Prior art keywords
- coal
- monitoring
- area
- compound
- rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 124
- 239000003245 coal Substances 0.000 title claims abstract description 117
- 238000005065 mining Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 150000001875 compounds Chemical class 0.000 claims abstract description 91
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims description 57
- 239000004575 stone Substances 0.000 claims description 44
- 239000002826 coolant Substances 0.000 claims description 40
- 239000000835 fiber Substances 0.000 claims description 38
- 229910052572 stoneware Inorganic materials 0.000 claims description 28
- 230000009970 fire resistant effect Effects 0.000 claims description 19
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 13
- 239000001099 ammonium carbonate Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 12
- 239000003063 flame retardant Substances 0.000 claims description 12
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 9
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 8
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 6
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 5
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 5
- 238000012806 monitoring device Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 230000002269 spontaneous effect Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 37
- 230000006872 improvement Effects 0.000 description 11
- 239000011435 rock Substances 0.000 description 9
- 238000007789 sealing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Special Wing (AREA)
Abstract
The invention discloses a natural ignition monitoring method for coal in a rock-gate airtight area for coal stratified mining, which belongs to the technical field of coal mine security and protection and comprises the steps of measuring the critical temperature of CO generated by coal bodies in the rock-gate airtight area and the pH value of the environment in the rock-gate airtight area, selecting a monitoring compound, arranging a monitoring area, monitoring the natural ignition of the coal in the rock-gate airtight area and the like. The monitoring compound which can be decomposed to generate non-air component gas is arranged in the goaf sealed area in the low-temperature oxidation period of the coal bed, the gas generated by decomposition of the monitoring compound is used as index gas for oxidation of the coal in the low-temperature oxidation period, whether the natural fire risk exists in the goaf coal body outside the goaf sealed area is judged according to the decomposition amount of the index gas, early warning is achieved, tiny fire can be timely controlled and extinguished, natural fire of the coal is restrained, spontaneous combustion accidents are avoided, potential safety hazards are reduced, and the monitoring compound is particularly suitable for fire monitoring of unattended goaf sealed areas for layered mining of extremely thick inclined coal beds.
Description
Technical Field
The invention relates to a natural coal ignition monitoring method, in particular to a natural coal ignition monitoring method for a rock-gate closed area during layered mining of an ultra-thick inclined coal seam, and belongs to the technical field of coal mine security.
Background
The underground stone gate of the coal mine is that two sides of a main transportation main roadway are provided with communication roadways to mining areas, tracks, mountains and mountains, transportation vehicle yards and the like, and the communication roadways are usually rock level roadways which are excavated in rock stratums, do not go through the ground and run perpendicular to or oblique to the trend of coal beds.
Because the inclined coal seam usually has the characteristics of complex structure and more faults and folds, and the pressure of the top plate of the inclined coal seam has component force vertically acting on the support or the coal pillar and component force along the inclined direction due to the inclination angle of the coal seam, after the coal seam is mined, the top and the bottom plates of the coal seam are likely to slide and collapse along the inclined direction, the support is poor in stability and easy to twist, and the supporting work difficulty of a working face is high, so that a layered mining mode is usually adopted for mining the extremely thick inclined coal seam. In the process of layered mining, when a working face crosses a rock door, generally, roof caving mining is not carried out on the rock door and a rock door coal seam 8 within a certain span mining range, meanwhile, as shown in figure 1, a rock door sealing area is formed on a rock door construction sealing wall 6 of the layered section, a false roof is constructed in the rock door sealing area for supporting, and a wood buttress 7 is generally adopted for supporting when the false roof is constructed. Due to the particularity of the process, when the second-level mining is carried out, mining stress changes can generate large disturbance on the upper-level rock-gate coal seam 8, the upper-level rock-gate coal seam 8 is prone to crack, air leakage of a rock-gate sealed area is caused, and natural ignition of coal and further spontaneous combustion accidents are easily caused under the condition that the coal seam heat is accumulated. The situation that the natural fire of the coal in the airtight area of the goalpost cannot be found visually due to the construction of the airtight wall 6 is usually found after a spontaneous combustion accident occurs and is extinguished through the pre-buried grouting pipeline, and the mode of post-processing not only causes resource waste, but also has great potential safety hazard.
Disclosure of Invention
Aiming at the problems, the invention provides a natural ignition monitoring method for the coal in the goalkeeper sealed area in coal layered mining, which can monitor the condition of heat accumulation of the coal layer in real time, restrain the natural ignition of the coal in time, avoid the occurrence of spontaneous combustion accidents and reduce the potential safety hazard, and is particularly suitable for carrying out fire monitoring on the unattended goalkeeper sealed area in the layered mining of the ultra-thick inclined coal layer.
In order to achieve the purpose, the natural ignition monitoring method for the coal in the goaf sealed area of coal stratified mining specifically comprises the following steps:
a) determining the critical temperature of CO generated by the coal body in the stoneware closed area and the pH value of the environment in the stoneware closed area:
sampling coal in the rock-gate sealed area before constructing the rock-gate sealed wall, measuring the coal sampling sample by using a programmed temperature rise experimental device to obtain the critical temperature of CO generated by the coal in the rock-gate sealed area, and measuring the inside of the rock-gate sealed area by using a pH value detection device to obtain the pH value corresponding to the environment of the rock-gate sealed area;
b) selecting a monitoring compound:
according to the measured value in the step a), selecting a compound which can decompose the generated gas and has a theoretical decomposition temperature lower than the critical temperature of CO generated by the coal body in the rock-gate sealed area, performing a temperature rise test on the compound in an environment simulating the pH value of the environment in the rock-gate sealed area to obtain the specific decomposition temperature of the compound in the environment in the rock-gate sealed area, and selecting the compound with the specific decomposition temperature lower than the critical temperature of CO generated by the coal body in the rock-gate sealed area as a monitoring compound;
c) arranging a monitoring area:
arranging a stone door sealed area by using a stone door sealed area monitoring system, wherein the stone door sealed area monitoring system comprises a monitoring compound applying part, a gas proportion detecting part and an active cooling control part, applying the monitoring compound in the stone door sealed area through the monitoring compound applying part, placing a detecting end of the gas proportion detecting part in the stone door sealed area, uniformly distributing cooling medium input pipes of the active cooling control part in the stone door sealed area, and finally constructing a sealed wall;
d) and (3) monitoring natural ignition of coal in the stonewall closed area:
after the airtight wall is built, detecting the gas proportion in the stonewall airtight area through a gas proportion detection part to obtain the initial proportion of the gas generated after the monitoring compound is decomposed; the monitoring compound applying part continuously applies the monitoring compound to the stonewall closed area according to a set period, and the gas proportion detecting part continuously detects according to the set period; and when the real-time ratio of the gas generated after the decomposition of the monitoring compound reaches the set multiple of the initial ratio, starting the active cooling control part to carry out active cooling treatment on the coal bed in the rock-gate sealed area.
As a further improvement scheme of the invention, in the step d), when the real-time ratio of the gas generated after the decomposition of the monitoring compound reaches 1.1-1.5 times of the initial ratio, the active cooling control part is started to carry out active cooling treatment on the coal bed in the goalkeeper sealed area.
As a further development of the invention, in step c) the monitoring compound is applied uniformly to the inner surface of the stonewall enclosed area.
In one embodiment of the present invention, in step b), the compound which can decompose the generated gas and has a theoretical decomposition temperature lower than the critical temperature of the coal body in the closed rock gate region to generate CO is one or more of ammonium bicarbonate, ammonium carbonate and ammonium sulfite.
As one embodiment of the present invention, the gas proportion detecting portion of the stoneware enclosed area monitoring system is a beam tube monitoring device.
As an implementation mode of the invention, the active cooling control part of the monitoring system of the stoneware closed area comprises a grouting pipeline pre-embedded in the stoneware closed area, and the active cooling is implemented in a grouting mode.
As a further improvement scheme of the invention, the stonewall closed area monitoring system also comprises flame-retardant cloth which is positioned and attached to the inner surface of the stonewall closed area; the active cooling control part comprises a plurality of heat-conducting fibers, the heat-conducting fibers stretch into the stoneware sealed area and are uniformly distributed and attached to the inner surface of the stoneware sealed area, the heat-conducting fibers are positioned through flame-retardant cloth and led out of the stoneware sealed area through a sleeve arranged on the sealed wall, the heat-conducting fibers are immersed into a cooling medium, and the cooling control of the temperature in the stoneware sealed area is realized through the cooling medium on the heat-conducting fibers.
As a further improvement scheme of the invention, the monitoring system for the stone door closed area also comprises a stuffing box and a pump set, wherein the flame retardant cloth is uniformly distributed and attached on the inner surface of the stone door closed area, the stuffing box is arranged outside the stone door closed area and comprises a monitoring compound applying box and a cooling medium applying box, the pump set is arranged outside the stone door closed area and comprises a monitoring compound applying pump and a cooling medium applying pump, the monitoring compound applying pump is connected with the monitoring compound applying box, and the cooling medium applying pump is connected with the cooling medium applying box; the cooling medium input pipe of the active cooling control part is a fire-resistant hose matched with the quantity of the heat-conducting fibers, the fire-resistant hose is sleeved at the end part of the heat-conducting fibers, the fire-resistant hose is led out to the outside of the stone door sealed area through a sleeve arranged on the sealed wall, the fire-resistant hose is respectively connected with a monitoring compound applying pump and a cooling medium applying pump through a valve group, and the monitoring compound or the cooling medium is conveyed to the inside of the stone door sealed area through the fire-resistant hose.
As a further improvement scheme of the invention, the active cooling control part comprises an active cooling controller, the heat conducting fiber is provided with a temperature sensor, the active cooling controller is respectively and electrically connected with the temperature sensor, and the active cooling controller is respectively and electrically connected with the monitoring compound applying pump and the cooling medium applying pump; when the temperature fed back by the temperature sensor on one heat-conducting fiber exceeds the set temperature, the active cooling controller controls the corresponding cooling medium to apply the pump to start, and the cooling medium carries out local cooling on the position where the heat-conducting fiber is located through the fire-resistant hose where the heat-conducting fiber is located.
As a further improvement scheme of the invention, the stoneware closed area monitoring system further comprises a centralized electric control part, wherein the centralized electric control part comprises a central processing unit, the central processing unit is respectively and electrically connected with the monitoring compound application part, the gas proportion detection part and the active cooling control part, and the central processing unit is used for carrying out automatic control.
Compared with the prior art, the natural coal ignition monitoring method for the goalkeeper sealed area in coal stratified mining can decompose the monitoring compound which is arranged in the goalkeeper sealed area in the low-temperature oxidation period of the coal bed to generate non-air component gas, the gas generated by decomposition of the monitoring compound is used as the index gas of the coal in the low-temperature oxidation period, the index gas quantity is continuously increased to indicate that the coal accumulates heat, whether the coal in the goalkeeper sealed area has the risk of natural ignition can be judged according to the decomposition quantity of the index gas, early warning is realized, the tiny fire can be timely controlled and extinguished, the natural coal ignition is restrained, the occurrence of spontaneous combustion accidents is avoided, and the potential safety hazard is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a rock-gate closed area for the layered mining of an inclined coal seam;
fig. 2 is a schematic structural diagram of one embodiment of the monitoring system for the stoneware enclosed area according to the present invention.
In the figure: 1. flame-retardant cloth, 2, heat-conducting fibers, 3, a fire-resistant hose, 4, a stuffing box, 5, a pump set, 6, a sealing wall, 7, a wood crib, 8 and a rock-door coal seam.
Detailed Description
The invention provides a natural ignition monitoring method for coal in a goaf closed area for coal stratified mining, which aims to add a monitoring compound capable of generating gas at a proper temperature into the goaf closed area, pre-warn the condition that CO is generated by coal in the goaf closed area by detecting the amount of the gas generated by the decomposition of the monitoring compound, judge whether heat is accumulated in the coal in a goaf outside the goaf closed area or not and judge whether the risk of natural ignition exists or not, and timely control and put out a tiny fire.
The invention is further described below with reference to the accompanying drawings.
The natural ignition monitoring method for the coal in the rock-gate airtight area for coal mining by layers specifically comprises the following steps:
a) determining the critical temperature of CO generated by the coal body in the stoneware closed area and the pH value of the environment in the stoneware closed area:
sampling the coal in the rock-gate sealed area before constructing the rock-gate sealed wall 6, measuring the coal sampling sample by a temperature programming experimental device to obtain the critical temperature of CO generated by the coal in the rock-gate sealed area, and measuring the pH value in the rock-gate sealed area by a pH value detection device to obtain the pH value corresponding to the environment of the rock-gate sealed area in order to obtain the accurate decomposition temperature of the compound corresponding to the environment of the rock-gate sealed area because the pH value of the external environment has influence on the decomposition of the compound.
b) Selecting a monitoring compound:
according to the measured value in the step a), selecting a compound which can decompose the generated gas and has a theoretical decomposition temperature lower than the critical temperature of CO generated by the coal body in the rock-gate sealed area, performing a temperature rise test on the compound in an environment simulating the pH value of the environment in the rock-gate sealed area to obtain the specific decomposition temperature of the compound in the environment in the rock-gate sealed area, and selecting the compound with the specific decomposition temperature lower than the critical temperature of CO generated by the coal body in the rock-gate sealed area as a monitoring compound. The critical temperature of CO generated by different coal bodies with different oxygen concentrations is different, the oxidation temperature of the coal sample is before 180 ℃, and the generation rule of CO and the oxidation temperature of the coal are in approximate exponential relationship. The compound whose decomposition critical temperature of the decomposed gas is lower than that of the coal body to generate CO can be one or more of ammonium bicarbonate, ammonium carbonate, ammonium sulfite and other compounds directly or a compound whose decomposition temperature is reduced by a catalyst or a modification means. Taking ammonium bicarbonate as an example, the theoretical value of the decomposition temperature of the ammonium bicarbonate is 58 ℃, and if the temperature of CO generated by the coal sample in the region is detected to be 80 ℃, the ammonium bicarbonate can be used for early warning.
c) Arranging a monitoring area:
the stoneware closed area monitoring system is used for arranging the stoneware closed area, the stoneware closed area monitoring system comprises a monitoring compound applying part, a gas proportion detecting part and an active cooling control part, the monitoring compound is applied in the stoneware closed area through the monitoring compound applying part, the detecting end of the gas proportion detecting part is arranged in the stoneware closed area, cooling medium input pipes of the active cooling control part are uniformly distributed in the stoneware closed area, and finally, the closed wall 6 is constructed. The beam tube monitoring device is a common gas detection device under the coal mine at present, and a beam tube monitoring device can be directly adopted in a gas proportion detection part. The active cooling control part can comprise a grouting pipeline pre-embedded in a stone door sealed area, and active cooling is implemented in a grouting mode.
d) And (3) monitoring natural ignition of coal in the stonewall closed area:
after the airtight wall 6 is built, detecting the gas proportion in the stonewall airtight area through a gas proportion detection part to obtain the initial proportion of the gas generated after the monitoring compound is decomposed; the monitoring compound applying part continuously applies the monitoring compound to the stonewall closed area according to a set period, and the gas proportion detecting part continuously detects according to the set period; and when the real-time ratio of the gas generated after the decomposition of the monitoring compound reaches the set multiple of the initial ratio, starting the active cooling control part to carry out active cooling treatment on the coal bed in the rock-gate sealed area.
Although the gas in the goalkeeper sealed area can not flow normally, a certain fluctuation exists under the condition of air leakage of cracks, and in order to ensure timely and effective implementation of temperature reduction control and suppression of natural ignition of coal, as a further improvement scheme of the invention, in the step d), when the real-time ratio of the gas generated after the decomposition of the monitoring compound reaches 1.1-1.5 times of the initial ratio, the active temperature reduction control part is started to carry out active temperature reduction treatment on the coal bed in the goalkeeper sealed area. Aiming at the condition that the monitoring compound is ammonium bicarbonate, starting an active cooling control part when the real-time ratio of gas generated after the decomposition of the ammonium bicarbonate reaches 1.3 times of the initial ratio; aiming at the condition that the monitoring compound is ammonium carbonate, starting an active cooling control part after the real-time ratio of gas generated after the decomposition of the ammonium carbonate reaches 1.1 times of the initial ratio; and aiming at the condition that the monitoring compound is ammonium sulfite, starting the active cooling control part after the real-time ratio of the gas generated after the decomposition of the ammonium sulfite reaches 1.5 times of the initial ratio.
In order to realize normal and smooth decomposition of the monitoring compound in the stonewall closed area and avoid slow decomposition caused by aggregation, as a further improvement of the invention, in the step c), the monitoring compound is uniformly applied on the inner surface of the stonewall closed area.
In order to reduce the temperature in the stoneware closed area, as a further improvement of the present invention, as shown in fig. 2, the stoneware closed area monitoring system further includes a flame retardant cloth 1, and the flame retardant cloth 1 is positioned and attached to the inner surface of the stoneware closed area; the initiative cooling control part includes many heat conduction fiber 2, and many heat conduction fiber 2 stretch into in the airtight district of stone door to the equipartition laminating is arranged on the internal surface in airtight district of stone door, and heat conduction fiber 2 passes through flame retardant coating 1 location, and heat conduction fiber 2 draws forth to the airtight district of stone door outside through the sleeve pipe that sets up on the airtight wall 6, and heat conduction fiber 2 submerges in the cooling medium. Through the cooling of cooling medium to heat conduction fiber 2, not only can realize losing, realizing the cooling control to the temperature in the airtight district of stone door with the heat conduction in coal seam, can realize promoting under the condition that will monitor compound arranges around heat conduction fiber 2 moreover that monitoring compound decomposes more rapidly and carries out the early warning.
In order to apply a monitoring compound and a cooling medium conveniently, as a further improvement scheme of the invention, the monitoring system of the stone door closed area further comprises a filler box 4 and a pump group 5, the flame retardant cloth 1 is uniformly distributed and attached on the inner surface of the stone door closed area, the filler box 4 is arranged outside the stone door closed area and comprises a monitoring compound applying box and a cooling medium applying box, the pump group 5 is arranged outside the stone door closed area and comprises a monitoring compound applying pump and a cooling medium applying pump, the monitoring compound applying pump is connected with the monitoring compound applying box, and the cooling medium applying pump is connected with the cooling medium applying box; the cooling medium input tube of initiative cooling control part is the fire-resistant hose 3 with the 2 quantity complex of heat conduction fiber, fire-resistant hose 3 cup joints the tip at heat conduction fiber 2, fire-resistant hose 3 is drawn forth to the outer portion of stone door airtight zone through the sleeve pipe that sets up on sealed wall 6, fire-resistant hose 3 applies the pump with monitoring compound respectively through the valves and is connected with cooling medium application pump, fire-resistant hose 3's internal diameter should not be less than 10 times of 2 diameters of heat conduction fiber, can be through fire-resistant hose 3 to the inside transport monitoring compound of stone door airtight zone or cooling medium.
In order to realize local cooling in the stone door sealed area, as a further improvement scheme of the invention, the active cooling control part comprises an active cooling controller, the heat conducting fiber 2 is provided with a temperature sensor, the active cooling controller is respectively and electrically connected with the temperature sensor, and the active cooling controller is respectively and electrically connected with a monitoring compound applying pump and a cooling medium applying pump; when the temperature fed back by the temperature sensor on a certain heat-conducting fiber 2 exceeds the set temperature, the active cooling controller controls the corresponding cooling medium to apply the pump to start, and the cooling medium can locally cool the position of the heat-conducting fiber 2 through the refractory hose 3 where the heat-conducting fiber 2 is located.
In order to realize automatic monitoring operation, as a further improvement scheme of the invention, the stonewall closed area monitoring system further comprises a centralized electric control part, wherein the centralized electric control part comprises a central processing unit, the central processing unit is respectively and electrically connected with the monitoring compound application part, the gas proportion detection part and the active cooling control part, and automatic control is carried out through the central processing unit.
The natural coal ignition monitoring method for the goalkeeper sealed area in coal stratified mining can judge whether the coal body in the goalkeeper sealed area has the risk of natural ignition according to the decomposition amount of the index gas, realize early warning, timely control and extinguish the tiny fire, restrain natural coal ignition, avoid spontaneous combustion accidents and reduce potential safety hazards, and is particularly suitable for carrying out fire monitoring on unattended goalkeeper sealed areas in stratified mining of ultra-thick inclined coal beds.
Claims (10)
1. A natural ignition monitoring method for coal in a rock-gate closed area for coal mining by layers is characterized by comprising the following steps:
a) determining the critical temperature of CO generated by the coal body in the stoneware closed area and the pH value of the environment in the stoneware closed area:
sampling coal in the rock-gate sealed area before constructing the rock-gate sealed wall (6), measuring the coal sampling sample by a programmed temperature rise experimental device to obtain the critical temperature of CO generated by the coal in the rock-gate sealed area, and measuring the inside of the rock-gate sealed area by a pH value detection device to obtain the pH value corresponding to the environment of the rock-gate sealed area;
b) selecting a monitoring compound:
according to the measured value in the step a), selecting a compound which can decompose the generated gas and has a theoretical decomposition temperature lower than the critical temperature of CO generated by the coal body in the rock-gate sealed area, performing a temperature rise test on the compound in an environment simulating the pH value of the environment in the rock-gate sealed area to obtain the specific decomposition temperature of the compound in the environment in the rock-gate sealed area, and selecting the compound with the specific decomposition temperature lower than the critical temperature of CO generated by the coal body in the rock-gate sealed area as a monitoring compound;
c) arranging a monitoring area:
arranging a stone door closed area by using a stone door closed area monitoring system, wherein the stone door closed area monitoring system comprises a monitoring compound applying part, a gas proportion detecting part and an active cooling control part, applying the monitoring compound in the stone door closed area through the monitoring compound applying part, placing a detecting end of the gas proportion detecting part in the stone door closed area, uniformly distributing cooling medium input pipes of the active cooling control part in the stone door closed area, and finally constructing a closed wall (6);
d) and (3) monitoring natural ignition of coal in the stonewall closed area:
after the airtight wall (6) is constructed, detecting the gas proportion in the stoneware airtight area through a gas proportion detection part to obtain the initial proportion of the gas generated after the monitoring compound is decomposed; the monitoring compound applying part continuously applies the monitoring compound to the stonewall closed area according to a set period, and the gas proportion detecting part continuously detects according to the set period; and when the real-time ratio of the gas generated after the decomposition of the monitoring compound reaches the set multiple of the initial ratio, starting the active cooling control part to carry out active cooling treatment on the coal bed in the rock-gate sealed area.
2. The natural ignition monitoring method for the coal in the goalpost closed area for coal stratified mining according to claim 1, wherein in step d), when the real-time ratio of the gas generated after the decomposition of the monitoring compound reaches 1.1-1.5 times of the initial ratio, the active cooling control part is started to carry out active cooling treatment on the coal bed in the goalpost closed area.
3. The method for monitoring natural ignition of coal in a goaf-tight area in stratified coal mining as claimed in claim 1, wherein in step c) the monitoring compound is uniformly applied to the inner surface of the goaf-tight area.
4. The method for monitoring natural ignition of the coal in the closed stone door zone for layered coal mining as claimed in claim 1, wherein in the step b), the compound which can decompose the produced gas and has the theoretical decomposition temperature lower than the critical temperature of CO produced by the coal in the closed stone door zone is one or more of ammonium bicarbonate, ammonium carbonate and ammonium sulfite.
5. The method for monitoring natural ignition of the coal in the goaf-sealed area in the coal stratified mining as claimed in claim 1, wherein the gas proportion detection part of the goaf-sealed area monitoring system is a beam tube monitoring device.
6. The method for monitoring natural ignition of the coal in the goaf sealed area for coal stratified mining as claimed in claim 1, wherein the active cooling control part of the goaf sealed area monitoring system comprises a grouting pipeline pre-embedded in the goaf sealed area, and active cooling is implemented by grouting.
7. The natural ignition monitoring method for the stoneware airtight area coal in the coal stratified mining as claimed in claim 1, wherein the stoneware airtight area monitoring system further comprises a flame retardant cloth (1), the flame retardant cloth (1) is positioned against the inner surface of the stoneware airtight area; initiative cooling control part includes many heat conduction fiber (2), many heat conduction fiber (2) stretch into to the airtight district of stone door in, and the equipartition laminating is arranged on the internal surface of airtight district of stone door, and heat conduction fiber (2) are fixed a position through fire-retardant cloth (1), heat conduction fiber (2) are drawn forth to the airtight district of stone door outside through the sleeve pipe that sets up on airtight wall (6), heat conduction fiber (2) immerse in the cooling medium, realize the cooling control to the temperature in the airtight district of stone door through the cooling medium to the cooling of heat conduction fiber (2).
8. The natural coal ignition monitoring method for the stone door closed area in the coal stratified mining is characterized in that the stone door closed area monitoring system further comprises a stuffing box (4) and a pump group (5), flame retardant cloths (1) are uniformly distributed and attached to the inner surface of the stone door closed area, the stuffing box (4) is arranged outside the stone door closed area and comprises a monitoring compound applying box and a cooling medium applying box, the pump group (5) is arranged outside the stone door closed area and comprises a monitoring compound applying pump and a cooling medium applying pump, the monitoring compound applying pump is connected with the monitoring compound applying box, and the cooling medium applying pump is connected with the cooling medium applying box; the cooling medium input tube of initiative cooling control part is with heat conduction fiber (2) quantity complex fire-resistant hose (3), the tip at heat conduction fiber (2) is cup jointed in fire-resistant hose (3), fire-resistant hose (3) are drawn forth to the airtight district outside of stone door through the sleeve pipe that sets up on sealed wall (6), fire-resistant hose (3) are applyed the pump with monitoring compound respectively through the valves and are applied the pump with the cooling medium and be connected, through fire-resistant hose (3) to the inside monitoring compound or the cooling medium of carrying of stone door airtight district.
9. The method for monitoring natural ignition of coal in the goalpost closed area for coal stratified mining as claimed in claim 8, wherein the active cooling control part comprises an active cooling controller, the heat conducting fiber (2) is provided with a temperature sensor, the active cooling controller is electrically connected with the temperature sensor, and the active cooling controller is electrically connected with the monitoring compound applying pump and the cooling medium applying pump respectively; when the temperature fed back by the temperature sensor on one heat-conducting fiber (2) exceeds the set temperature, the active cooling controller controls the corresponding cooling medium to apply the pump to start, and the cooling medium carries out local cooling on the position where the heat-conducting fiber (2) is located through the fire-resistant hose (3) where the heat-conducting fiber (2) is located.
10. The natural ignition monitoring method for the stonewall closed area coal in the coal stratified mining as claimed in claim 1, wherein the stonewall closed area monitoring system further comprises a centralized electric control part, the centralized electric control part comprises a central processing unit, the central processing unit is electrically connected with the monitoring compound application part, the gas proportion detection part and the active cooling control part respectively, and automatic control is performed through the central processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010158407.2A CN111350547B (en) | 2020-03-09 | 2020-03-09 | Natural ignition monitoring method for coal in rock-gate airtight area for coal mining by layers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010158407.2A CN111350547B (en) | 2020-03-09 | 2020-03-09 | Natural ignition monitoring method for coal in rock-gate airtight area for coal mining by layers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111350547A CN111350547A (en) | 2020-06-30 |
| CN111350547B true CN111350547B (en) | 2021-05-04 |
Family
ID=71194419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010158407.2A Active CN111350547B (en) | 2020-03-09 | 2020-03-09 | Natural ignition monitoring method for coal in rock-gate airtight area for coal mining by layers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111350547B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828767A (en) * | 2012-07-19 | 2012-12-19 | 大同煤矿集团有限责任公司 | Gob natural fire control method |
| CN203515658U (en) * | 2013-10-16 | 2014-04-02 | 陈传新 | Automatic closed remote-control fire protection device for coal mining area |
| WO2017013634A2 (en) * | 2015-07-22 | 2017-01-26 | David Lechtman | Terminating expansion of underground coal fires and protecting the environment |
| CN110145365A (en) * | 2018-02-11 | 2019-08-20 | 辽宁工程技术大学 | A kind of mine goaf fire monitoring prior-warning device |
| CN110735660A (en) * | 2019-11-08 | 2020-01-31 | 贵州盘江精煤股份有限公司 | device for preventing spontaneous combustion of goaf in coal mine and using method thereof |
-
2020
- 2020-03-09 CN CN202010158407.2A patent/CN111350547B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828767A (en) * | 2012-07-19 | 2012-12-19 | 大同煤矿集团有限责任公司 | Gob natural fire control method |
| CN203515658U (en) * | 2013-10-16 | 2014-04-02 | 陈传新 | Automatic closed remote-control fire protection device for coal mining area |
| WO2017013634A2 (en) * | 2015-07-22 | 2017-01-26 | David Lechtman | Terminating expansion of underground coal fires and protecting the environment |
| CN110145365A (en) * | 2018-02-11 | 2019-08-20 | 辽宁工程技术大学 | A kind of mine goaf fire monitoring prior-warning device |
| CN110735660A (en) * | 2019-11-08 | 2020-01-31 | 贵州盘江精煤股份有限公司 | device for preventing spontaneous combustion of goaf in coal mine and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111350547A (en) | 2020-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2015361774B2 (en) | Method for efficiently treating spontaneous ignition of remaining coal in large area goaf of shallow-buried coal bed | |
| CN112943343B (en) | Efficient and rapid fire extinguishing method for ground drilling of different types of fires in coal mine goaf | |
| CN109236350B (en) | Fire disaster treatment method for large dip angle super-thick coal seam | |
| CN108678798A (en) | The control method of spontaneous combustion in goaf during being withdrawn for fully mechanized coal face | |
| CN110552677B (en) | Mine type coal underground gasification furnace and gasification method | |
| CN1766287A (en) | Apparatus for preventing and controlling coal dust and gas explosion on working face | |
| CN112546487B (en) | Treatment process for fire zone of coal seam around coal mine collapse column | |
| CN110735660A (en) | device for preventing spontaneous combustion of goaf in coal mine and using method thereof | |
| CN109162751A (en) | Coal seam group near interval fire hazard treating method | |
| CN105134281A (en) | Fire preventing and extinguishing method for multi-face air-adjacent island fully mechanized mining face mining period of coal mine | |
| CN111350547B (en) | Natural ignition monitoring method for coal in rock-gate airtight area for coal mining by layers | |
| CN106499431A (en) | Adjacent nitrogen injection in goaf method of fire protection during gob side entry driving | |
| Cao et al. | Mechanism of Fire Prevention with Liquid Carbon Dioxide and Application of Long‐Distance Pressure‐Holding Transportation Technology Based on Shallow Buried and Near‐Horizontal Goaf Geological Conditions | |
| CN210858689U (en) | Mine type coal underground gasification furnace | |
| CN112963137B (en) | Underground gasification method for steeply inclined coal seam with inclination angle of more than 70 degrees and coal thickness of less than 5m | |
| CN115711152A (en) | Tunnel exit work area low-gas section gas comprehensive management construction method | |
| Yao et al. | Construction risks of Huaying mount tunnel and countermeasures | |
| CN112682086B (en) | Nitrogen injection fire prevention method for small coal pillar mining near goaf | |
| CN106609677A (en) | A gas extraction and discharge construction method | |
| CN114814080A (en) | Raw coal occurrence CO gas determination device and method capable of eliminating oxidation interference | |
| CN115081194A (en) | Method for calculating CO real critical value and application thereof | |
| Yu et al. | Integrated Approaches forExtinguishing the Fire of Coal Pillars in Contiguous Coal Seams | |
| CN113818833A (en) | Small coal pillar drilling grouting plugging and fire preventing and extinguishing method | |
| Zhongpeng | Research on working face of residual coal self-ignition characteristics and early warning technology | |
| CN110792466A (en) | Fire prevention and extinguishing method for mining in coal mine fire area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |