CN109083677B - Coal seam goaf gas extraction spontaneous combustion simulation experiment device - Google Patents
Coal seam goaf gas extraction spontaneous combustion simulation experiment device Download PDFInfo
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- CN109083677B CN109083677B CN201811305196.XA CN201811305196A CN109083677B CN 109083677 B CN109083677 B CN 109083677B CN 201811305196 A CN201811305196 A CN 201811305196A CN 109083677 B CN109083677 B CN 109083677B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
Abstract
The invention relates to a coal seam goaf gas extraction spontaneous combustion simulation experiment device which comprises a U-shaped channel formed by two side wall channels and a bottom channel connected between the two side wall channels, wherein one side wall channel forms an air inlet channel, the other side wall channel forms an air return channel, inner holes of the bottom channel form a goaf, coal storage interlayers for placing coal blocks are arranged on the top and bottom channel walls of the U-shaped channel, air holes are formed in interlayer walls, adjacent to one side of the inner cavity of the U-shaped channel, of the coal storage interlayers, and a plurality of layers of coal storage plates which are arranged at intervals along the up-down direction and used for placing the coal blocks are arranged on the side channel walls of the U-shaped channel. The invention solves the problem that spontaneous combustion cannot be formed due to large difference between the quantity of coal blocks and the quantity of actual recovery construction in the prior art because the coal blocks are only placed at the bottom of a goaf.
Description
Technical Field
The invention relates to a coal seam goaf gas extraction spontaneous combustion simulation experiment device in the field of coal seam exploitation.
Background
During the coal seam exploitation, gas can flow out from the coal and rock. In recent years, with the increase of mining depth, high gas mines, coal and gas outburst mines are more and more, and gas accidents are continuous. At present, the main measure adopted for gas control is gas drainage, wherein the gas drainage comprises goaf gas drainage, but some coal mines have the danger of spontaneous combustion of coal when the goaf gas drainage controls upper corner gas overrun, and the spontaneous combustion of coal is caused by oxidation generated after the coal contacts with air, so that the heat is released by oxidation, and when the heat reaches a certain value, the coal is spontaneous combustion.
If the negative pressure of gas drainage is too small, less air enters the goaf, the risk of spontaneous combustion of coal is reduced, but the gas flowing out of the goaf to the still corners is increased, so that the gas overrun alarm affects the production and the coal mine safety. Therefore, finding a suitable relationship between gas drainage and spontaneous combustion of coal is important for controlling upper corner gas overrun and spontaneous combustion of coal. The Chinese patent CN103775122B discloses a 'gas extraction and coal spontaneous combustion simulation experiment device for a goaf of a coal seam with easy spontaneous combustion' which comprises a U-shaped working face coal mining system, a ventilation system, a gas system, an extraction system, a data test acquisition system, wherein the U-shaped working face consists of an air inlet roadway, an air return roadway, a working face, a goaf and the like, the ventilation system comprises a extraction ventilator and an accessory device, the gas system comprises a gas bottle, a valve, a pressure gauge and a pipeline, the extraction system comprises a gas extraction pump, an extraction pipe, a valve, a flowmeter and a negative pressure gauge, and the data test acquisition system comprises a custom sensor, a temperature sensor, a co sensor, a connecting wire, a data acquisition module, a power supply, an industrial personal computer, data processing software and the like.
The air inlet roadway simulates an air inlet roadway in real stoping construction, the air return roadway simulates an air return roadway in real stoping construction, and the goaf simulates a goaf in real working conditions. In the document, during the test, firstly, broken coal and rocks with different sizes are scattered to a goaf, a data test acquisition system, a ventilation system, a gas system and a drainage system are sequentially opened, the test is started, and finally, when monitoring data shows that co is generated and the temperature is raised, the test is ended when the spontaneous combustion of coal can be judged. The existing coal spontaneous combustion simulation test device has the following problems: the coal distribution situation is seriously different from the real underground coal distribution situation, the coal distribution is too little, so that spontaneous combustion of coal is basically impossible to realize, a large amount of coal reacts with air to possibly generate spontaneous combustion phenomenon, in a real underground coal mining environment, coal is arranged at the bottom, the top and the side wall of a goaf, in addition, coal is arranged at the top, the bottom and the side wall of an air inlet roadway and an air return roadway, so that air flow entering the goaf through the air inlet roadway has longer temperature and higher temperature, and the coal in the goaf is greatly added to finally cause spontaneous combustion phenomenon, but in the experiment, only some crushed coal is scattered at the bottom of the goaf, in the practical experiment, the spontaneous combustion phenomenon is difficult to generate on coal blocks, and the concentration of co is basically not increased in data; in addition, in the prior art, the entity belt is utilized to simulate the coal bed, so that not only can the waste of materials be caused, but also other equipment can be caused to be placed in no position, and finally, the whole coal spontaneous combustion simulation experiment device occupies a large space.
Disclosure of Invention
The invention aims to provide a coal seam goaf gas extraction spontaneous combustion simulation experiment device, which is used for solving the problem that spontaneous combustion cannot be formed due to large difference between the quantity of coal blocks and the quantity of actual stoping construction in the prior art because the coal blocks are only placed at the bottom of a goaf.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a coal seam goaf gas drainage spontaneous combustion simulation experiment device, include by two lateral wall passageway and connect the U-shaped passageway that the bottom passageway constitutes between two lateral wall passageways, one of them lateral wall passageway forms the air inlet tunnel, another one lateral wall passageway forms the return air tunnel, the hole in bottom passageway forms the goaf, be provided with the coal intermediate layer that is used for placing the coal cinder on the top of U-shaped passageway and the bottom passageway wall, be provided with the bleeder vent on the intermediate layer wall that the coal intermediate layer is adjacent U-shaped passageway inner chamber one side, be provided with the multilayer on the lateral part passageway wall of U-shaped passageway along the coal board that is used for placing the coal cinder of upper and lower direction interval arrangement.
The lateral channel wall of the U-shaped channel comprises a lateral wall outer layer plate and a lateral wall inner layer plate positioned on the inner side of the lateral wall outer layer plate, each coal storage plate is rotationally assembled on the corresponding lateral wall inner layer plate, a coal storage plate driving mechanism for driving the coal storage plates to rotate is arranged between the lateral wall outer layer plate and the lateral wall inner layer plate, and the coal storage plates are provided with coal storage positions which are positioned at horizontal positions and are used for storing coal and coal discharge positions which are inclined towards the inner side so as to enable coal blocks to slide down in the rotation process.
The coal storage plate driving mechanism comprises a transmission rod which is assembled on the outer side of the inner layer plate of the side wall along the vertical guide movement, coal storage plate hook rods corresponding to the coal storage plates of all layers are arranged on the transmission rod at intervals, the coal storage plate hook rods are perpendicular to the transmission rod, the coal storage plate driving mechanism further comprises a gear motor arranged between the outer layer plate of the side wall and the inner layer plate of the side wall, a transmission gear is arranged at the power output end of the gear motor, and racks meshed with the transmission gear are arranged at the bottoms of the transmission rod.
The side wall inner layer plate is provided with strip-shaped mounting grooves which are arranged in one-to-one correspondence with the coal storage plates and extend along the horizontal direction, two ends of each coal storage plate are respectively and rotatably assembled on two side walls of the corresponding strip-shaped mounting grooves, the coal storage plates are provided with limit baffles which are used for being matched with upper grooves of the corresponding strip-shaped mounting grooves along the stop so as to stop the coal storage plates at coal storage positions and prevent coal blocks from entering the side wall outer layer plate and between the side wall inner layer plates, and the limit baffles are vertically arranged with the coal storage plates.
An empty placement area is formed between the two side wall channels, a gas tank for supplying gas to the goaf is arranged in the placement area, and a gas drainage pump is also arranged in the placement area.
The upper interlayer wall of the coal storage interlayer at the top of the U-shaped channel is a turnover opening interlayer wall.
The upper interlayer wall of the coal storage interlayer at the bottom of the U-shaped channel is a turnover opening interlayer wall.
The beneficial effects of the invention are as follows: according to the invention, the coal storage interlayers used for placing the coal blocks are arranged on the top and bottom channel walls of the whole U-shaped channel, namely, the coal blocks can be placed in the coal storage interlayers no matter the top and the bottom of the air inlet channel, the air return channel and the goaf, on one hand, the coal storage quantity of the coal storage interlayers can be ensured, on the other hand, the normal walking of the bottom of the U-shaped channel can be not influenced, the experimenter can walk in the U-shaped channel conveniently, and in addition, the coal blocks are placed on the side walls of the air inlet channel, the air return channel and the goaf through the coal storage plates, so that the distribution state of each coal block in the underground stoping process is truly simulated, and the true spontaneous combustion formation is facilitated.
Drawings
FIG. 1 is a schematic diagram of the structure of one embodiment of the present invention;
FIG. 2 is a schematic view of the air intake tunnel of FIG. 1;
FIG. 3 is a schematic view of the sidewall of the goaf of FIG. 1;
FIG. 4 is a schematic view of the structure of the sidewall inner panel of FIG. 2;
FIG. 5 is a schematic view of the structure of the coal storage plate in FIG. 2;
fig. 6 is an enlarged view at a in fig. 2;
FIG. 7 is a schematic view showing the coal storage plate of FIG. 6 in a coal unloading position;
fig. 8 is a schematic view of the structure of the driving rod in fig. 2.
Detailed Description
An embodiment of a coal seam goaf gas extraction spontaneous combustion simulation test device is shown in fig. 1-8: the air intake system comprises a U-shaped channel formed by two side wall channels and a bottom channel connected between the two side wall channels, wherein an inner hole of one side wall channel forms an air intake channel 7, an inner hole of the other side wall channel forms an air return channel 6, an inner hole of the bottom channel forms a goaf 2, a channel opening sealing plate 9 is arranged at a channel opening of the air return channel, and a draw-out ventilator 8 is arranged on the channel opening sealing plate. An empty placement area 5 is formed between the two side wall channels, a gas tank 4 for supplying gas to the goaf is arranged in the placement area, a gas drainage pump 3 is also arranged in the placement area, and the gas drainage pump is connected with the goaf through a gas pipe. The top and the bottom passageway wall of U-shaped passageway are provided with the coal intermediate layer that is used for placing the coal piece, that is to say air inlet roadway, return air roadway and goaf's top and bottom all are provided with the coal intermediate layer that deposits, the upside intermediate layer wall of the coal intermediate layer of the top of U-shaped passageway is can overturn and open the type intermediate layer wall, the upside intermediate layer wall of the coal intermediate layer of the bottom of U-shaped passageway is can overturn and open the type intermediate layer wall, can overturn and open the type intermediate layer wall and include by the apron 1 that can overturn, can open the coal intermediate layer through the upset apron, then put into the coal piece in the coal intermediate layer, cover the upset apron again, it is provided with bleeder vent 13 on the intermediate layer wall 14 of coal intermediate layer one side of being close to U-shaped passageway inner chamber.
The side channel walls of the U-shaped channel comprise side wall outer laminates 20 and side wall inner laminates 17 positioned on the inner sides of the side wall outer laminates, each coal storage plate 16 is rotationally assembled on the corresponding side wall inner laminate 17, a coal storage plate driving mechanism for driving the coal storage plates 16 to rotate is arranged between the side wall outer laminates 20 and the side wall inner laminates 17, and the coal storage plates are provided with coal storage positions which are positioned at horizontal positions for storing coal and coal discharge positions which are inclined towards the inner sides so as to enable coal blocks to slide down in the rotating process. The coal storage plate driving mechanism comprises a transmission rod 18 which is assembled on the outer side of the inner layer plate of the side wall along the vertical guiding movement, a guide sleeve 19 for guiding and assembling the transmission rod along the up-down direction is arranged on the inner layer plate of the side wall, the transmission rod is of a square rod structure, an inner hole of the guide sleeve 19 is a square hole matched with the square rod, coal storage plate hook rods 28 which correspond to each layer of coal storage plates respectively are arranged on the transmission rod 18 at intervals, the coal storage plate hook rods 28 are vertically arranged with the transmission rod 18, the coal storage plate driving mechanism further comprises a speed reducing motor 23 arranged between the outer layer plate 20 of the side wall and the inner layer plate 17 of the side wall, a transmission gear 22 is arranged at the power output end of the speed reducing motor 23, a motor in the speed reducing motor is a self-locking motor, and a rack 21 which is meshed and driven by the transmission gear is arranged at the bottom of the transmission rod 18. The side wall inner layer plate is provided with strip-shaped mounting grooves 27 which are arranged in one-to-one correspondence with the coal storage plates and extend along the horizontal direction, two ends of each coal storage plate are respectively and rotatably assembled on two side walls of the corresponding strip-shaped mounting grooves, the coal storage plate 16 is provided with limit baffles 15 which are used for being matched with the upper groove edges of the corresponding strip-shaped mounting grooves in a blocking mode so as to stop the coal storage plates at a coal storage position and prevent coal blocks from entering the side wall outer layer plate and between the side wall inner layer plates, and the limit baffles are vertically arranged with the coal storage plates.
And a temperature sensor and a CO sensor are also arranged in the goaf. The side wall structure of the goaf is shown in fig. 3, and the difference between the side wall structure of the goaf and the air inlet roadway and the air return roadway is that a layer of shell 24 is covered on the outer side of the goaf, a gas buffer space 26 is formed between the shell and the side wall of the goaf, a gas tank is connected with the gas buffer space, and after gas enters the gas buffer space, the gas enters the goaf through a gas hole 25 on an outer layer plate of the side wall of the goaf.
When the coal storage device is used, the corresponding coal storage interlayer is opened through the overturning cover plate, coal blocks can be arranged at the top and the bottom of the U-shaped channel, the reducing motor of the coal storage plate driving mechanism drives the transmission rod 18 to move downwards, each coal storage plate hook rod 28 on the transmission rod is respectively hooked with the corresponding coal storage plate to overturn and stop rotation, the limiting baffle 15 is matched with the upper groove edge of the corresponding strip-shaped mounting groove in a stop mode, at the moment, the coal storage plates are positioned at coal storage positions, coal blocks can be placed on the coal storage plates of each layer to simulate the real environment of coal blocks distributed on the side wall of a roadway wall and the side wall of a goaf in the underground recovery process, the coal blocks in the coal storage interlayer simulate the real environment of coal blocks distributed at the top and bottom of the roadway in the underground recovery process, gas is released into the goaf, the gas drainage pump is used for conducting gas drainage simulation in the real working condition, the roadway wind in the extraction simulation real environment is pumped, the air and the coal blocks are in contact with the coal blocks to oxidize and heat, a large amount of the coal blocks are subjected to spontaneous combustion, the coal blocks can be monitored, the spontaneous combustion is carried out, and the spontaneous combustion time is judged by the coal combustion is detected, and the spontaneous combustion relation of the gas drainage is found.
Claims (6)
1. The utility model provides a coal seam goaf gas drainage spontaneous combustion simulation experiment device, includes by two lateral wall passageway and the U-shaped passageway that constitutes of the bottom passageway of connecting between two lateral wall passageways, one of them lateral wall passageway forms the air inlet tunnel, and another one of them lateral wall passageway forms the return air tunnel, and the hole of bottom passageway forms the goaf, its characterized in that: the coal storage device comprises a U-shaped channel, wherein coal storage interlayers used for storing coal blocks are arranged on the top and bottom channel walls of the U-shaped channel, air holes are formed in interlayer walls, adjacent to one side of an inner cavity of the U-shaped channel, of the coal storage interlayers, multiple layers of coal storage plates used for storing the coal blocks are arranged on the side channel walls of the U-shaped channel at intervals along the up-down direction, an empty arrangement area is formed between two side wall channels, a gas tank used for supplying gas to the goaf is arranged in the arrangement area, a gas drainage pump is further arranged in the arrangement area, a roadway opening sealing plate is arranged at a roadway opening of an air return roadway, and a drawing ventilator is arranged on the roadway opening sealing plate.
2. The simulation experiment device for spontaneous combustion of gas extraction in a goaf of a coal seam according to claim 1, wherein the simulation experiment device comprises: the lateral channel wall of the U-shaped channel comprises a lateral wall outer layer plate and a lateral wall inner layer plate positioned on the inner side of the lateral wall outer layer plate, each coal storage plate is rotationally assembled on the corresponding lateral wall inner layer plate, a coal storage plate driving mechanism for driving the coal storage plates to rotate is arranged between the lateral wall outer layer plate and the lateral wall inner layer plate, and the coal storage plates are provided with coal storage positions which are positioned at horizontal positions and are used for storing coal and coal discharge positions which are inclined towards the inner side so as to enable coal blocks to slide down in the rotation process.
3. The simulation experiment device for spontaneous combustion of gas extraction in a goaf of a coal seam according to claim 2, wherein the simulation experiment device is characterized in that: the coal storage plate driving mechanism comprises a transmission rod which is assembled on the outer side of the inner layer plate of the side wall along the vertical guide movement, coal storage plate hook rods corresponding to the coal storage plates of all layers are arranged on the transmission rod at intervals, the coal storage plate hook rods are perpendicular to the transmission rod, the coal storage plate driving mechanism further comprises a gear motor arranged between the outer layer plate of the side wall and the inner layer plate of the side wall, a transmission gear is arranged at the power output end of the gear motor, and racks meshed with the transmission gear are arranged at the bottoms of the transmission rod.
4. The simulation experiment device for spontaneous combustion of gas extraction in a goaf of a coal seam according to claim 2, wherein the simulation experiment device is characterized in that: the side wall inner layer plate is provided with strip-shaped mounting grooves which are arranged in one-to-one correspondence with the coal storage plates and extend along the horizontal direction, two ends of each coal storage plate are respectively and rotatably assembled on two side walls of the corresponding strip-shaped mounting grooves, the coal storage plates are provided with limit baffles which are used for being matched with upper grooves of the corresponding strip-shaped mounting grooves along the stop so as to stop the coal storage plates at coal storage positions and prevent coal blocks from entering the side wall outer layer plate and between the side wall inner layer plates, and the limit baffles are vertically arranged with the coal storage plates.
5. The simulation experiment device for spontaneous combustion of gas extraction in a coal seam goaf according to any one of claims 1-4, wherein the simulation experiment device is characterized in that: the upper interlayer wall of the coal storage interlayer at the top of the U-shaped channel is a turnover opening interlayer wall.
6. The simulation experiment device for spontaneous combustion of gas extraction in a coal seam goaf according to any one of claims 1-4, wherein the simulation experiment device is characterized in that: the upper interlayer wall of the coal storage interlayer at the bottom of the U-shaped channel is a turnover opening interlayer wall.
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