CN111504368A - Three-zone partitioning and experimental method for spontaneous combustion of coal in goaf under high stress condition - Google Patents
Three-zone partitioning and experimental method for spontaneous combustion of coal in goaf under high stress condition Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 70
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 38
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 35
- 238000002474 experimental method Methods 0.000 title claims description 34
- 238000000638 solvent extraction Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000011156 evaluation Methods 0.000 claims abstract description 14
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 54
- 230000007246 mechanism Effects 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 230000036284 oxygen consumption Effects 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 238000009417 prefabrication Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000005253 cladding Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 abstract description 3
- 238000012795 verification Methods 0.000 abstract description 3
- 206010003497 Asphyxia Diseases 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention discloses a goaf coal spontaneous combustion three-zone division method under a high stress condition, which comprises the three steps of basic information acquisition, checking evaluation, experimental evaluation and the like. On one hand, the flexibility and the universality of spontaneous combustion partition evaluation of the goaf meeting different geological condition types can be effectively realized; on the other hand, the accuracy and the efficiency of the spontaneous combustion state judgment and evaluation operation of the coal seam goaf in the high-stress environment are effectively realized, and the simulation verification can be realized under the laboratory condition, so that the labor intensity and the working cost are effectively reduced.
Description
Technical Field
The invention belongs to the technical field of coal mine fire prevention, and particularly relates to a coal spontaneous combustion three-zone division method for a coal mine goaf.
Background
For the goaf of the U-shaped ventilation system, the goaf can be divided into a heat dissipation zone, a spontaneous combustion zone and a suffocation zone according to the possibility of spontaneous combustion of the residual coal. The three-zone division of spontaneous combustion in the goaf is one of the important contents of mine fire prevention and extinguishing foundation work, and when the working face is in normal production, the three-zone spontaneous combustion in the goaf is objective and is in a dynamic stable state. The main content of the spontaneous combustion three-zone observation of the goaf is to detect the change condition of the oxygen concentration in the goaf along with the advance of a working surface, and determine the ranges of a heat dissipation zone, a spontaneous combustion zone and a suffocation zone according to the critical oxygen concentration of coal oxidation. The method taking the oxygen concentration of the goaf as the division standard is the most widely applied and effective division method in engineering practice at present.
Spontaneous combustion ignition of residual coal in the mined-out area is caused by the existence of air leakage, so that how the air leakage flows in coal rock gaps in the mined-out area, namely, the research on the air leakage permeation law of the mined-out area is the primary task of solving spontaneous combustion of the residual coal in the mined-out area. The goaf is a porous medium formed by the left coal and the caving rock, and the determination of the porosity and the permeability of the goaf becomes important parameters influencing the simulation result of the whole goaf air leakage flow field. The stress field is the root cause of dynamic change of caving form, porosity and permeability of the goaf.
The research has proved that the oxygen consumption intensity in the reaction system is increased along with the increase of the axial loading intensity under the same temperature point, so that the traditional standard of dividing the three-zone range by the oxygen concentration of the goaf has certain limitation under the high stress environment of deep mining.
Therefore, in order to meet the current situation, a brand-new goaf spontaneous combustion assessment and division method needs to be developed urgently to meet the needs of actual work.
Disclosure of Invention
The invention provides a goaf coal spontaneous combustion three-zone dividing method under a high stress condition, and aims to solve the problems in the background art.
In order to achieve the technical purpose, the invention provides the following technical scheme:
a goaf coal spontaneous combustion three-zone dividing method under a high stress condition comprises the following steps:
s1, collecting basic information, and continuously detecting the temperature, the ventilation volume and the oxygen content concentration of the goaf;
s2, checking and evaluating, and establishing a functional relation between oxygen concentration and oxygen consumption and air leakage speed according to the spontaneous combustion rule that spontaneous combustion of coal in the goaf is mainly caused by air leakage, oxygen supply, automatic oxidation, heat release and temperature rise of coal, oxidation acceleration and even combustion, wherein the specific functional expression is as follows:
unpressurized oxygen concentration = a + unpressurized oxygen consumption + b + unpressurized air leakage speed;
oxygen consumption = unpressurized oxygen consumption × e axial stress
Air leakage speed = unpressurized air leakage speed × e axial stress
Oxygen concentration = a oxygen consumption + b wind leakage velocity
Wherein: a. b and e are fitting coefficients;
then, the field data collected in the step S1 is substituted into the function, and the three-zone range of the goaf under the action of high stress is judged according to the value of the oxygen concentration by calculating the value of the oxygen consumption under the condition of the same oxygen consumption and air leakage speed;
and S3, performing experimental evaluation, namely preparing a coal sample according to the structural characteristics of the goaf coal seam in the step S1, then placing the coal sample in experimental equipment, acquiring the detection result of the coal sample through the experimental equipment, then comparing and checking the acquired result with the calculation result in the step S2, and finishing evaluation and judgment when the deviation of the settlement result is within the error range.
Further, in the step S3, the experimental apparatus includes a gas bomb, a booster pump, an experimental cavity, an upper sealing plug, a lower sealing plug, a pressure regulating piston, a lifting driving mechanism, a heating jacket, a gas chromatograph, a temperature and humidity sensor, a pressure sensor, a driving circuit, and a bearing frame, the bearing frame is a frame structure with an axis perpendicular to a horizontal plane, the experimental cavity and the lifting driving mechanism are embedded in the bearing frame and coaxially distributed with the bearing frame, the experimental cavity is located right above the lifting driving mechanism, the experimental cavity is a cylindrical cavity structure with a rectangular axial cross section, an upper end surface and a lower end surface of the experimental cavity are respectively connected with the upper sealing plug and the lower sealing plug to form a sealed cavity structure, the pressure regulating piston is located in the experimental cavity, coaxially distributed with the experimental cavity and slidably connected with a side wall of the experimental cavity, and a lower end surface of the pressure regulating piston is connected with the lifting driving mechanism through a guide, and the lower sealed end cap that the guide post corresponds establishes the thru hole, the heating jacket cladding is in the experiment chamber outside and with the coaxial distribution in experiment chamber, temperature and humidity sensor, pressure sensor are all at least one, encircle the experiment chamber axis and inlay in experiment chamber lateral wall internal surface, at least one air inlet and at least one gas vent are established to experiment chamber lateral surface, just air inlet and gas vent encircle experiment chamber axis equipartition, and wherein the air inlet passes through honeycomb duct and booster pump intercommunication, and the gas vent passes through honeycomb duct and gas chromatograph intercommunication, and the booster pump passes through honeycomb duct and gas bomb intercommunication, gas bomb, booster pump, gas chromatograph, drive circuit all with bear frame surface connection, just drive circuit respectively with temperature and humidity sensor, pressure sensor, booster pump, lift actuating mechanism, heating jacket, gas chromatograph electrical connection.
Furthermore, the lifting driving mechanism is any one of an electric telescopic rod, a hydraulic telescopic rod and a pneumatic telescopic rod.
Furthermore, at least one refrigerating mechanism is arranged on the outer surface of the side wall of the experimental cavity and is electrically connected with the driving circuit.
Furthermore, the driving circuit is a circuit system based on any one or two of an industrial single chip microcomputer and an industrial computer.
Further, the coal sample is placed in experimental equipment for experimental operation, and the experimental method comprises the following steps:
s1, prefabricating equipment, namely firstly preparing a corresponding coal sample according to the inner layer structural characteristics of an actual goaf, then driving a pressure regulating piston to the bottom of an experiment cavity by a lifting driving mechanism, then placing the coal sample in the experiment cavity, enabling the lower end face of the coal sample to be abutted against the upper end face of the pressure regulating piston and sealing the experiment cavity, thereby completing prefabrication of the equipment, then driving a heating sleeve to operate, adjusting the temperature in the experiment cavity to be consistent with the temperature of the actual goaf, preserving the heat for at least 30 minutes, finally opening a GC-4000A type gas chromatograph, setting parameters according to experiment requirements, keeping the temperature for 8-24 hours, calibrating the chromatogram by using standard gas after a spectrum baseline is stable, and completing prefabrication operation of the equipment;
s2, simulation experiment, after the step S1 is completed, the pressure regulating piston is driven to move upwards by the lifting driving mechanism, the axial pressure borne by each sample is increased, the axial pressure borne by the coal sample is consistent with the actual goaf formation pressure, the pressure value is ensured to be constant, and meanwhile, the regulating displacement of the pressure regulating piston is counted; then, pressurizing the gas in the gas storage cylinder by a booster pump, enabling the pressure of the pressurized gas to be consistent with the gas pressure and flow in the coal seam pore of the actual goaf, and recording the current gas pressure and flow; and finally, driving the heating sleeve to operate, raising the temperature of the experimental cavity at a constant speed at the speed of 1-5 ℃/min, detecting the pressure and the temperature of gas discharged from an exhaust port of the experimental cavity according to the temperature rise of 10 ℃, detecting gas components by using a GC-4000A type gas chromatograph, and counting and summarizing detection results.
Further, when the simulation experiment is performed in the step S2, the same coal sample is detected under axial pressure environments of 3MPa, 6MPa, 9MPa, 12MPa and 15MPa, respectively; meanwhile, during temperature rise detection, the highest temperature of the coal sample is not more than 500 ℃, and during detection in different axial pressure environments, the coal sample is naturally cooled to be consistent with the actual goaf stratum temperature, and then detection is performed in the next axial pressure environment.
On one hand, the flexibility and the universality of spontaneous combustion partition evaluation of the goaf meeting different geological condition types can be effectively realized; on the other hand, the accuracy and the efficiency of the spontaneous combustion state judgment and evaluation operation of the coal seam goaf in the high-stress environment are effectively realized, and the simulation verification can be realized under the laboratory condition, so that the labor intensity and the working cost are effectively reduced.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the experimental apparatus;
FIG. 3 is a schematic flow chart of the experimental method.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in FIG. 1, a goaf coal spontaneous combustion three-zone division method under high stress conditions comprises the following steps:
s1, collecting basic information, and continuously detecting the temperature, the ventilation volume and the oxygen content concentration of the goaf;
s2, checking and evaluating, and establishing a functional relation between oxygen concentration and oxygen consumption and air leakage speed according to the spontaneous combustion rule that spontaneous combustion of coal in the goaf is mainly caused by air leakage, oxygen supply, automatic oxidation, heat release and temperature rise of coal, oxidation acceleration and even combustion, wherein the specific functional expression is as follows:
unpressurized oxygen concentration = a + unpressurized oxygen consumption + b + unpressurized air leakage speed;
oxygen consumption = unpressurized oxygen consumption × e axial stress
Air leakage speed = unpressurized air leakage speed × e axial stress
Oxygen concentration = a oxygen consumption + b wind leakage velocity
Wherein: a. b and e are fitting coefficients;
then, the field data collected in the step S1 is substituted into the function, and the three-zone range of the goaf under the action of high stress is judged according to the value of the oxygen concentration by calculating the value of the oxygen consumption under the condition of the same oxygen consumption and air leakage speed;
and S3, performing experimental evaluation, namely preparing a coal sample according to the structural characteristics of the goaf coal seam in the step S1, then placing the coal sample in experimental equipment, acquiring the detection result of the coal sample through the experimental equipment, then comparing and checking the acquired result with the calculation result in the step S2, and finishing evaluation and judgment when the deviation of the settlement result is within the error range.
As shown in fig. 2, in the step S3, the experimental apparatus includes a gas bomb 1, a booster pump 2, an experimental cavity 3, an upper sealing plug 4, a lower sealing plug 5, a pressure regulating piston 6, a lifting driving mechanism 7, a heating jacket 8, a gas chromatograph 9, a temperature and humidity sensor 10, a pressure sensor 11, a driving circuit 12, and a bearing frame 13, the bearing frame 13 is a frame structure whose axis is perpendicular to a horizontal plane, the experimental cavity 3 and the lifting driving mechanism 7 are both embedded in the bearing frame 13 and coaxially distributed with the bearing frame 13, the experimental cavity 3 is located right above the lifting driving mechanism 7, the experimental cavity 3 is a columnar cavity structure whose axial cross section is rectangular, an upper end surface and a lower end surface of the experimental cavity are respectively connected with the upper sealing plug 4 and the lower sealing plug 5 to form a sealed cavity structure, the pressure regulating piston 6 is located in the experimental cavity 3, coaxially distributed with the experimental cavity 3 and slidably connected with a sidewall of the experimental cavity 3, the lower end face of the pressure regulating piston 6 is connected with the lifting driving mechanism 7 through the guide post 14, the lower sealing plug 5 corresponding to the guide post 14 is provided with a through hole 15, the heating sleeve 8 is coated on the outer side of the experimental cavity 3 and coaxially distributed with the experimental cavity 3, at least one of the temperature and humidity sensor 10 and the pressure sensor 11 is embedded in the inner surface of the side wall of the experimental cavity 3 around the axis of the experimental cavity 3, at least one air inlet 31 and at least one air outlet 32 are arranged on the side surface of the experimental cavity 3, the air inlet 31 and the air outlet 32 are uniformly distributed around the axis of the experimental cavity 3, wherein the air inlet 31 is communicated with the booster pump 2 through a guide pipe, the air outlet 32 is communicated with the gas chromatograph 9 through a guide pipe, the booster pump 2 is communicated with the gas bomb 1 through a guide pipe, and the bomb 1, the, and the driving circuit 12 is respectively and electrically connected with the temperature and humidity sensor 10, the pressure sensor 11, the booster pump 2, the lifting driving mechanism 7, the heating jacket 8 and the gas chromatograph 9.
The lifting driving mechanism 7 is any one of an electric telescopic rod, a hydraulic telescopic rod and a pneumatic telescopic rod.
In addition, at least one refrigerating mechanism 33 is arranged on the outer surface of the side wall of the experiment cavity 3, and the refrigerating mechanism 33 is electrically connected with the driving circuit 12.
Meanwhile, the driving circuit 12 is a circuit system based on any one or two of an industrial single chip microcomputer and an industrial computer.
As shown in fig. 3, the experimental operation of placing the coal sample in the experimental facility includes the following steps:
s1, prefabricating equipment, namely firstly preparing a corresponding coal sample according to the inner layer structural characteristics of an actual goaf, then driving a pressure regulating piston to the bottom of an experiment cavity by a lifting driving mechanism, then placing the coal sample in the experiment cavity, enabling the lower end face of the coal sample to be abutted against the upper end face of the pressure regulating piston and sealing the experiment cavity, thereby completing prefabrication of the equipment, then driving a heating sleeve to operate, adjusting the temperature in the experiment cavity to be consistent with the temperature of the actual goaf, preserving the heat for at least 30 minutes, finally opening a GC-4000A type gas chromatograph, setting parameters according to experiment requirements, keeping the temperature for 8-24 hours, calibrating the chromatogram by using standard gas after a spectrum baseline is stable, and completing prefabrication operation of the equipment;
s2, simulation experiment, after the step S1 is completed, the pressure regulating piston is driven to move upwards by the lifting driving mechanism, the axial pressure borne by each sample is increased, the axial pressure borne by the coal sample is consistent with the actual goaf formation pressure, the pressure value is ensured to be constant, and meanwhile, the regulating displacement of the pressure regulating piston is counted; then, pressurizing the gas in the gas storage cylinder by a booster pump, enabling the pressure of the pressurized gas to be consistent with the gas pressure and flow in the coal seam pore of the actual goaf, and recording the current gas pressure and flow; and finally, driving the heating sleeve to operate, raising the temperature of the experimental cavity at a constant speed at the speed of 1-5 ℃/min, detecting the pressure and the temperature of gas discharged from an exhaust port of the experimental cavity according to the temperature rise of 10 ℃, detecting gas components by using a GC-4000A type gas chromatograph, and counting and summarizing detection results.
In this embodiment, when the simulation experiment is performed in the step S2, the same coal sample is detected under axial pressure environments of 3MPa, 6MPa, 9MPa, 12MPa, and 15MPa, respectively; meanwhile, during temperature rise detection, the highest temperature of the coal sample is not more than 500 ℃, and during detection in different axial pressure environments, the coal sample is naturally cooled to be consistent with the actual goaf stratum temperature, and then detection is performed in the next axial pressure environment.
On one hand, the flexibility and the universality of spontaneous combustion partition evaluation of the goaf meeting different geological condition types can be effectively realized; on the other hand, the accuracy and the efficiency of the spontaneous combustion state judgment and evaluation operation of the coal seam goaf in the high-stress environment are effectively realized, and the simulation verification can be realized under the laboratory condition, so that the labor intensity and the working cost are effectively reduced.
The foregoing is a more detailed description of the present invention and is not to be construed as limiting the invention. To those skilled in the art to which the invention relates, numerous changes, substitutions and alterations can be made without departing from the spirit of the invention, and these changes are deemed to be within the scope of the invention as defined by the appended claims.
Claims (7)
1. The goaf coal spontaneous combustion three-zone dividing method under the high stress condition is characterized by comprising the following steps of:
s1, collecting basic information, and continuously detecting the temperature, the ventilation volume and the oxygen content concentration of the goaf;
s2, checking and evaluating, and establishing a functional relation between oxygen concentration and oxygen consumption and air leakage speed according to the spontaneous combustion rule that spontaneous combustion of coal in the goaf is mainly caused by air leakage, oxygen supply, automatic oxidation, heat release and temperature rise of coal, oxidation acceleration and even combustion, wherein the specific functional expression is as follows:
unpressurized oxygen concentration = a + unpressurized oxygen consumption + b + unpressurized air leakage speed;
oxygen consumption = unpressurized oxygen consumption × e axial stress
Air leakage speed = unpressurized air leakage speed × e axial stress
Oxygen concentration = a oxygen consumption + b wind leakage velocity
Wherein: a. b and e are fitting coefficients;
then, the field data collected in the step S1 is substituted into the function, and the three-zone range of the goaf under the action of high stress is judged according to the value of the oxygen concentration by calculating the value of the oxygen consumption under the condition of the same oxygen consumption and air leakage speed;
and S3, performing experimental evaluation, namely preparing a coal sample according to the structural characteristics of the goaf coal seam in the step S1, then placing the coal sample in experimental equipment, acquiring the detection result of the coal sample through the experimental equipment, then comparing and checking the acquired result with the calculation result in the step S2, and finishing evaluation and judgment when the deviation of the settlement result is within the error range.
2. The method for dividing the spontaneous combustion three zones of the goaf coal under the high stress condition according to claim 1, wherein in the step S3, the experimental equipment comprises a gas bomb, a booster pump, an experimental cavity, an upper sealing plug, a lower sealing plug, a pressure regulating piston, a lifting driving mechanism, a heating jacket, a gas chromatograph, a temperature and humidity sensor, a pressure sensor, a driving circuit and a bearing rack, the bearing rack is a frame structure with an axis vertical to the horizontal plane, the experimental cavity and the lifting driving mechanism are all embedded in the bearing rack and coaxially distributed with the bearing rack, the experimental cavity is located right above the lifting driving mechanism, the experimental cavity is a columnar cavity structure with a rectangular axial section, the upper end surface and the lower end surface of the experimental cavity are respectively connected with the upper sealing plug and the lower sealing plug to form a sealed cavity structure, the pressure regulating piston is located in the experimental cavity, with experiment chamber coaxial distribution and with experiment chamber lateral wall sliding connection, pressure regulating piston lower extreme surface passes through the guide post and is connected with lift actuating mechanism, and the lower sealed end cap that the guide post corresponds establishes the thru hole, the heating jacket cladding is in the experiment chamber outside and with experiment chamber coaxial distribution, humiture sensor, pressure sensor all at least one encircles experiment chamber axis and inlays in experiment chamber lateral wall internal surface, experiment chamber lateral surface establishes at least one air inlet and at least one gas vent, just air inlet and gas vent encircle experiment chamber axis equipartition, and wherein the air inlet passes through the honeycomb duct and communicates with the booster pump, and the gas vent passes through the honeycomb duct and communicates with gas chromatograph, and the booster pump passes through the honeycomb duct and communicates with the gas bomb, booster pump, gas chromatograph, drive circuit all are connected with bearing frame surface, just drive circuit respectively with humiture sensor, pressure sensor, The pressure sensor, the booster pump, the lifting driving mechanism, the heating sleeve and the gas chromatograph are electrically connected.
3. The method for dividing the three zones of spontaneous combustion of coal in the goaf under the high stress condition as claimed in claim 2, wherein the lifting driving mechanism is any one of an electric telescopic rod, a hydraulic telescopic rod and a pneumatic telescopic rod.
4. The method for dividing the spontaneous combustion three zones of the goaf coal under the high stress condition as claimed in claim 2, wherein at least one refrigerating mechanism is arranged on the outer surface of the side wall of the experimental chamber, and the refrigerating mechanism is electrically connected with a driving circuit.
5. The goaf coal spontaneous combustion three-zone division method under the high stress condition as claimed in claim 2, wherein the driving circuit is a circuit system based on one or two of industrial single chip microcomputer and industrial computer.
6. The method for dividing the goaf coal spontaneous combustion three zones under the high stress condition as claimed in claim 1, wherein the coal sample is placed in experimental equipment for experimental operation, comprising the following steps:
s1, prefabricating equipment, namely firstly preparing a corresponding coal sample according to the inner layer structural characteristics of an actual goaf, then driving a pressure regulating piston to the bottom of an experiment cavity by a lifting driving mechanism, then placing the coal sample in the experiment cavity, enabling the lower end face of the coal sample to be abutted against the upper end face of the pressure regulating piston and sealing the experiment cavity, thereby completing prefabrication of the equipment, then driving a heating sleeve to operate, adjusting the temperature in the experiment cavity to be consistent with the temperature of the actual goaf, preserving the heat for at least 30 minutes, finally opening a GC-4000A type gas chromatograph, setting parameters according to experiment requirements, keeping the temperature for 8-24 hours, calibrating the chromatogram by using standard gas after a spectrum baseline is stable, and completing prefabrication operation of the equipment;
s2, simulation experiment, after the step S1 is completed, the pressure regulating piston is driven to move upwards by the lifting driving mechanism, the axial pressure borne by each sample is increased, the axial pressure borne by the coal sample is consistent with the actual goaf formation pressure, the pressure value is ensured to be constant, and meanwhile, the regulating displacement of the pressure regulating piston is counted; then, pressurizing the gas in the gas storage cylinder by a booster pump, enabling the pressure of the pressurized gas to be consistent with the gas pressure and flow in the coal seam pore of the actual goaf, and recording the current gas pressure and flow; and finally, driving the heating sleeve to operate, raising the temperature of the experimental cavity at a constant speed at the speed of 1-5 ℃/min, detecting the pressure and the temperature of gas discharged from an exhaust port of the experimental cavity according to the temperature rise of 10 ℃, detecting gas components by using a GC-4000A type gas chromatograph, and counting and summarizing detection results.
7. The goaf coal spontaneous combustion three-zone partitioning method under the high stress condition as claimed in claim 3, wherein: when the simulation experiment is carried out in the step S2, the same coal sample is respectively detected under the axial pressure environments of 3MPa, 6MPa, 9MPa, 12MPa and 15 MPa; meanwhile, during temperature rise detection, the highest temperature of the coal sample is not more than 500 ℃, and during detection in different axial pressure environments, the coal sample is naturally cooled to be consistent with the actual goaf stratum temperature, and then detection is performed in the next axial pressure environment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112114082A (en) * | 2020-09-03 | 2020-12-22 | 河南理工大学 | Intelligent coal spontaneous combustion process heat insulation test method and device thereof |
| CN114496104A (en) * | 2022-04-02 | 2022-05-13 | 中国矿业大学(北京) | Method and system for evaluating spontaneous combustion degree of residual coal in goaf under coal mining condition |
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