CN110821544A - Self-ignition coal hole coal bed gasification furnace type mining area in mine - Google Patents
Self-ignition coal hole coal bed gasification furnace type mining area in mine Download PDFInfo
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- CN110821544A CN110821544A CN201810920391.7A CN201810920391A CN110821544A CN 110821544 A CN110821544 A CN 110821544A CN 201810920391 A CN201810920391 A CN 201810920391A CN 110821544 A CN110821544 A CN 110821544A
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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
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/20—Apparatus; Plants
- C10J3/22—Arrangements or dispositions of valves or flues
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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
- E21F16/00—Drainage
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
Abstract
The invention relates to a self-ignition coal hole coal seam gasification furnace type mining area in a mine, which aims to produce heat value coal gas in coal seam production in the mine. The invention is formed by connecting a gas injection ventilation roadway, a gas injection roadway, upward inclined rock holes, a gasified coal roadway in the coal seam at the lowest part of the coal seam group, vertical gas injection rock holes penetrating through the gasified coal roadways in the coal seams of the coal seam group, the gasified coal roadway in the coal seam at the uppermost part of the coal seam group and the gasified coal holes in the coal seams at the two sides of the coal seam group in sequence. Along the whole length of the roadway and the drill hole, a gas injection pipe combination consisting of a gas injection pipe, a flame spray pipe, a gas sampling pipe and a flame injector and a self-ignition coal hole coal bed gasification furnace together with a gasification coal hole are arranged, and coal in a coal bed around the gasification coal hole is gasified to produce coal gas. The coal gas enters a gasified coal roadway, a mining area coal gas transportation coal roadway, a mine coal gas transportation roadway and a mine coal gas transportation shaft in sequence and flows to the ground along the full section. The invention is suitable for coal mine coal gas production under various coal bed conditions.
Description
The invention relates to the technical field of direct coal gas production in coal seams, and belongs to the coal chemical technology.
The background technology is the prior art for producing coal gas by coal beds, and is a coal bed gasification furnace with a vertical hole drilled on the ground in the former Soviet Union. The technology comprises the steps of constructing a gas injection ground drilling hole and a gas transportation ground drilling hole from the ground to a coal seam, wherein the two drilling holes are connected through original fractures of the coal seam in the coal seam to form the coal seam gasification furnace. And gasifying coal of the coal bed around the primary fracture to produce coal gas. The problem with this technique is that a water pump cannot be installed to drain the groundwater that floods into both ground boreholes.
The invention relates to a self-ignition coal hole coal bed gasification furnace type mining area, aiming at solving the problems in the prior art by using a drainage water pump of a mine.
According to the invention, a gas injection ventilation roadway, a gas injection roadway, upward inclined gas injection rock holes, a gasified coal roadway in a coal seam group at the bottom of the coal seam group, vertical gas injection rock holes penetrating through the gasified coal roadways in the coal seams of the coal seam group, the gasified coal roadway in the coal seam group at the top of the coal seam group and the gasified coal holes in the coal seams at two sides thereof are sequentially connected to form a gas injection roadway drilling combination of the coal seam gasification furnace. The gasified coal roadways in each coal layer of the coal layer group are sequentially connected with a coal mining area gas transportation coal roadway, a mine gas transportation shaft and the ground in the coal layer to form a coal mining area gas transportation system, and the coal roadway in the system adopts a U-shaped steel telescopic metal support. And the coal gas transportation coal roadway of the mining area in each coal layer of the coal layer group is positioned right above and parallel to the gas injection ventilation roadway of the mining area. The gasification coal roadways of the coal beds of the coal bed group are on a vertical plane, have equal length and are parallel to each other above. And a gasification agent oxygen pipeline, a gasification agent steam pipeline, a compressed air pipeline, a carbon dioxide pipeline and a water pipe are arranged in the gas injection ventilation roadway of the mining area to form a gas injection pipeline combination of the mining area.
In the invention, the uppermost coal seam in the coal seam group is combined into a whole length along the gas injection roadway of the coal seam gasification furnace, a gas injection pipe is arranged, one end of the gas injection pipe is connected with a gasifying agent oxygen pipeline and a gasifying agent water vapor pipeline in the gas injection ventilation roadway of the mining area, and the other end of the gas injection pipe is provided with a gas injection pipe orifice positioned at the end part of a gasification coal hole. The gas injection pipe is internally provided with a flaming agent pipe in the whole length, one end of the flaming agent pipe is connected with a flaming agent container in a gas injection ventilation roadway of a mining area, and the other end of the flaming agent pipe is connected with a flame ejector at the position of a gas injection pipe orifice. The gas injection pipe is internally provided with a gas sampling pipe, one end of the gas sampling pipe is connected with a monitoring platform in a gas injection ventilation roadway of a mining area, and the other end of the gas sampling pipe extends out of the gas injection pipe at the position where a gasification coal hole is connected with the gasification coal roadway. The gas injection pipe assembly of the coal bed gasification furnace is formed by a gas injection pipe, a fire spraying agent pipe, a gas sampling pipe, a flame ejector and fire spraying agent gas containing. The gasification coal hole and the gas injection pipe connected with the gasification coal hole are combined to form the self-ignition coal hole coal bed gasification furnace. Personnel operate in the gas injection ventilation roadway of the mining area, and simultaneously inject oxygen and water vapor into the gas injection pipe and inject fire spraying agent into the fire spraying agent pipe. After the flame spraying agent is sprayed out from the flame sprayer, the circuitous oxygen is natural to form flame, the coal on the wall of the gasified coal hole is ignited, and the coal-hole coal-bed gasification furnace produces coal gas. The coal gas flows into a coal gas transportation system of a mining area and flows to the ground along the full sections of a coal roadway, a roadway and a shaft of the system. Coal in the coal seam around the gasified coal hole is continuously gasified and consumed to form a goaf.
In the invention, a plurality of gasified coal holes are respectively arranged in coal seams at two sides of a gasified coal roadway of a coal seam at the uppermost part of a coal seam group, and each gasified coal hole is connected with 1 gas injection roadway drilling combination and a gas injection pipe combination in the gas injection roadway drilling combination to form 1 self-ignition coal hole coal seam gasification furnace. Multiple coal-hole coal-bed gasifiers in one gasified coal roadway produce coal gas simultaneously. And after the production of the coal gas is finished, the coal of the coal seams at two sides of the gasified coal roadway is gasified and consumed, and a goaf of the gasified coal roadway is formed.
The coal seam in the mining area is divided into a plurality of coal gas production units which are connected with each other in equal length along the whole length of the gas injection ventilation roadway of the mining area and the coal gas transportation roadway of the mining area in each coal seam of the coal seam group. Each coal gas production unit is composed of a mining area gas injection ventilation roadway in the length of the coal gas production unit, a mining area gas transportation roadway in each coal seam group, 1 gasification coal roadway in each coal seam in each side of the coal seam group, and a plurality of gasification coal holes in the coal seams on the two sides of each gasification coal roadway. The coal gas transportation coal road in each coal gas production unit is in the same vertical plane. Therefore, in the coal gas production unit, each 1 in the coal seam at the top of the coal seam group ignites the coal seam gasification furnace, and the vertical gas injection pipe combination part in the gas injection pipe combination connected with the coal seam gasification furnaces penetrates through the gasification coal road of each coal seam.
The coal mining method is implemented, coal of each layer of the coal seam group in the mining area is used for producing coal gas layer by layer in sequence from top to bottom, and the coal seam at the top of the coal seam group is the first mining coal seam. 2 gasification coal roadways of each coal gas production unit in the same coal seam sequentially take over to produce coal gas according to the direction opposite to the flowing direction of the coal gas in the coal gas transportation roadway of the mining area. And an isolating coal pillar for preventing the coal of the coal bed from being gasified is reserved between the gasified coal roadway goafs of the adjacent coal gas production units in the coal bed so as to support the hard rock stratum above the gasified coal roadway goafs on the two sides of the coal bed not to deform and seal each coal bed gasification furnace. And stopping gas production in the mining area after 1 coal seam in the coal seam group finishes producing gas. And (3) enabling personnel to enter each gasification coal roadway of the next adjacent coal seam, constructing a plurality of new gasification coal holes in the coal seams at two sides of the coal roadway, cutting off each pipeline exposed in the vertical gas injection pipe combination in the roadway, completing the project that the gas injection pipe combination extends to the gasification coal holes, and constructing the coal seam gasification furnace for the self-ignition coal holes in the successive production coal seams.
The invention is implemented by the gasification mine for producing coal gas, the mine air inlet ventilation shaft and the mine air return ventilation shaft which are close to each other are respectively connected with the mine central air inlet roadway and the mine central air return roadway which are close to each other and parallel, and the mine is divided into two sides. Two sides of the mine are respectively provided with a mine gas transportation shaft which is connected with 1 mine gas transportation roadway, and the upper 2 shafts are close to each other so as to jointly produce facilities on the ground. There are multiple sectors on each side of the mine. The gas injection ventilation laneway of the mining area at each side has a uniform end connected with the central air inlet laneway of the mine and the other end connected with the boundary mine air return laneway and the boundary mine air return shaft in sequence, thus forming independent ventilation systems at two sides of the mine. The mine air inlet ventilation shaft adopts a ventilation mode that ground air is pressed into the shaft. And the coal gas transportation coal roadways of the mining areas are respectively connected with the mine coal gas transportation roadway and the mine coal gas transportation shaft to form independent coal gas transportation systems on two sides of the mine. In the period of producing coal gas in the mining area at one side of the mine, the engineering of replacing the production mining area is constructed at the other side of the mine, and the mining areas at the two sides of the mine alternately produce coal gas, so that no human construction engineering is carried out at one side of the coal gas production.
On one side of the coal gas produced by the mine, an air injection ventilation roadway of an inner mining area is connected with an upward roadway of a coal gas transportation roadway of the mine and a coal gas transportation roadway of the mining area, and a sealing wall, a sand bag sealing wall and a water column are sequentially arranged from bottom to top.
In the implementation of the invention, two mine gas transportation shafts are respectively connected with 1 ground exhaust fan. Before coal gas production begins in the mining area of the inner 1 coal seam, an exhaust fan is started to pump out air in a shaft and a roadway of a coal gas transportation system connected with the coal seam, and simultaneously carbon dioxide is injected into a gas injection pipe of each gasification coal roadway to replace the air. When the gasified coal roadway in the mining area finishes the production of the coal bed gas, each self-ignition coal bed gasification furnace stops injecting oxygen and water vapor, and water is injected through a gas injection pipe, so that the water is changed into water vapor in the mining area of the coal bed gasification furnace, and therefore, firstly, the fire is extinguished and the temperature is reduced, and secondly, the water vapor replaces the residual high-temperature coal gas in the mining area of the gasified coal roadway, so that pollutants in the coal gas are prevented from being attached to the solid surface after being cooled and polluting underground water. And after no coal gas exists in the gas sample collected by the gas sampling pipes of the coal-bed gasification furnaces in the goafs of the gasification coal roadways, stopping water injection, injecting carbon dioxide through the gas injection pipes of the coal-bed gasification furnaces, and keeping the gas pressure in the goafs of the gasification coal roadways equal to the gas pressure in the coal transportation roadways of the mining areas.
The invention can regulate and control the air inlet pressure of the atmospheric air fan connected with the mine air inlet shaft, so that the air pressure in the gas injection ventilation roadway of the coal gas production mining area is equal to the air pressure of the coal gas in the gasification coal roadway of the coal gas production. And the gap between the hole wall and the wall of the gas injection pipe in each upward gas injection rock hole and each vertical gas injection rock hole is filled with a filling material for sealing. The gas injection rock channel is internally provided with a sealing wall for sealing upward gas injection rock holes, and the sealing wall is provided with a carbon dioxide gas injection pipe for regulating and controlling the amount of injected carbon dioxide so that the air pressure at two sides of the sealing wall is equal to the air pressure in the gasification coal roadway.
The invention is implemented by connecting a gasification agent vapor pipeline of a ground boiler, laying along a mine gas transportation shaft, a mine gas transportation roadway, a mining area gas transportation pipeline, rock holes reaching the end parts of all gas injection roadways, all gas injection roadways and a mine gas injection ventilation roadway, and respectively connecting the gasification agent vapor pipeline in the mine gas injection ventilation roadway, wherein the pipeline is provided with a normally closed valve corresponding to each gas production unit.
The invention is implemented by constructing a plurality of upward inclined gas injection rock holes on a gas injection roadway, and combining the gas injection roadway of the self-ignition coal bed gasification furnace of the gasified coal roadway in the coal bed at the top of each coal bed group of each gas production unit by drilling. In the whole length of the gas injection roadway drilling combination of the self-ignition coal bed gasification furnace, a gas injection pipe combination of the self-ignition coal bed gasification furnace and the gasification coal holes connected with the gas injection pipe combination form the self-ignition coal bed gasification furnace. A plurality of gasification coal holes are formed in a gasification coal roadway in a coal layer at the top of the coal layer group, a plurality of self-ignition coal hole coal layer gasification furnaces are constructed, and a plurality of gas injection pipes connected with the coal layer gasification furnaces are combined and penetrate through the vertical gas injection pipes. Gaps between the inner wall of the vertical gas injection sub-well and each gas injection pipe and between the gas injection pipes are filled with filling materials for sealing.
The invention has the advantage of solving the problem that the existing coal seam gas production technology cannot be provided with a water pump to discharge underground water.
Drawings
FIG. 1 is a plan view of a conventional coal bed gasifier with vertical ground drilling
In the figure, 1 is a coal seam; 2, drilling a coal gas ground; 3, drilling a gas injection ground; 4 is the ground; and 5, primary fractures are formed in the coal seam, and coal around the fractures is continuously gasified and consumed.
FIG. 2 is a diagram of a tunnel drilling combined gas injection pipe combination, a mining area gas injection pipeline combination and a mining area gas transportation system of a coal bed gasification furnace
In the figure, 4 is the ground; 7 is the outline line of the coal seam around the goaf after the coal seam gasification furnace stops producing; 8 is a mine ventilation roadway; 9 is a mine ventilation shaft; 10 is a gas injection ventilation roadway of a mining area; 23 is a gas injection roadway; 11 is an upward inclined rock hole; 12 is the coal seam at the lowest part of the coal seam group; 13 is a gasification coal roadway of the coal seam at the lowest part of the coal seam group; 14 is a vertical gas injection rock hole; 15 is the uppermost coal seam of the coal seam group; 16 is a gasification coal roadway in the coal seam at the top of the coal seam group; 17 is a gasification coal hole; 18 is a coal gas transportation coal road of a mining area; 19 is a mine gas transportation coal road; 20 is a mine transportation shaft; 21 is a mining area gas injection pipeline combination; 22 is a gas injection pipe combination of the coal seam self-ignition coal seam gasification furnace, and consists of a gas injection pipe, a fire spraying agent pipe and a flame ejector, wherein the fire spraying agent pipe and the gas sampling pipe are arranged in the gas injection pipe and have the same length as the gas injection pipe, and the flame ejector is positioned at the end part of a gasification coal hole and is connected with the fire spraying agent pipe; and 24 is a sealing wall.
FIG. 3 is a cross-sectional view of an upward inclined gas injection rock hole and a vertical gas injection rock hole
In the figure, 11 is an upward inclined gas injection rock hole; 25 is a flaming agent pipe, 26 is a gas sampling pipe, and 27 is filling.
FIG. 4 is a combined view of an inner gas injection pipe in a gasification coal hole
In the figure, 7 is a contour line of a coal seam around a gasification goaf after the coal seam gasification furnace stops production; 14 is a vertical gas injection pipe combination; 16 is a gasification coal roadway; 17 is a gasification coal hole; 22 is a gas injection pipe; 26 is a flame agent spraying pipe; 27 is a gas sampling pipe extending out of the gas injection pipe; 28 is a flame jet; 29 is the gas flow direction
FIG. 5 gasification coal hole cross-sectional view
In the figure, 17 is a gasification coal hole; 22 is a gas injection pipe; and 26 is a gunning agent pipe.
FIG. 6 is a schematic diagram of a coal gas production unit in a mining area
In the figure, 10 is a gas injection ventilation roadway of a mining area; 11 is an upward inclined gas injection rock hole; 12 is the coal bed at the lowest part of the coal gas group; 13 is a gasification coal roadway in the coal seam at the lowest part of the coal seam group; 14 is a vertical gas injection rock hole; 15 is the uppermost coal seam of the coal seam group; 16 is a gasification coal roadway in the coal seam at the top of the coal seam group; 17 is a gasification coal hole; 18 is a coal gas transportation coal road of a mining area; and 23 is a gas injection roadway.
FIG. 7 is a diagram of adjacent gasification coal roadway goaf areas in the same coal seam of adjacent gas production units
In the figure, 1 is a coal seam, and 16 is a raw gasification coal roadway; 17 is a raw gasified coal hole; 30 is a gasification coal roadway goaf; 31 is an isolation coal pillar; 32 is a soft rock layer above the coal seam; 33 is a hard formation above the coal seam.
FIG. 8 is a diagram of the gas injection ventilation roadway and the coal gas transportation roadway in the mining area
In the figure, 1 is a coal seam; 10 is a gas injection ventilation roadway of a mining area; 18 is a coal gas transportation coal road of a mining area; 24 is a sealing wall; 41 is an upward rock roadway; 42 is water; 43 is a horizontal plane; 44 is a sandbag wall.
FIG. 9 is a plan view of a gasification chamber for producing gas from a coal seam
In the figure, 10 is a gas injection roadway of a mining area; 18 is a coal gas transportation coal road of a mining area; 34 is a mine air inlet ventilation shaft which is a vertical shaft; 35 is a mine return air ventilation shaft which is a vertical shaft; 36 is a mine air inlet ventilation roadway and is positioned below the coal seam at the lowest part of the coal seam group; 37 is a mine return air ventilation roadway and is positioned below the coal seam group at the lowest part of the coal seam group; 38 is a connecting roadway; 39 is a boundary return air shaft; 40 is a mine gas transportation shaft which is a vertical shaft; 41 is a mine boundary return air roadway; and 42 is a mine gas transportation roadway.
FIG. 10 is a diagram of a self-ignition coal-hole coal-bed gasification furnace with a vertical tube mine
In the figure, 4 is the ground; 6, a vertical pipe mine; 7 is the outline line of the coal seam around the goaf of the self-ignition coal hole and coal hole gasification furnace; 8 is a mine ventilation roadway; 9 is a mine ventilation shaft; 10 is a gas injection ventilation roadway of a mining area; 12 is the coal seam at the lowest part of the coal seam group; 13 is a gasification coal roadway in the coal seam at the lowest part of the coal seam group; 14 is a vertical gas injection rock hole; 15 is the uppermost coal seam of the coal seam group; 16 is a gasification coal roadway in the coal seam at the top of the coal seam group; 17 is a gasification coal hole; 18 is a coal gas transportation coal road of a mining area; 19 is a mine gas transportation coal road; 20 is a mine gas transportation shaft; 21 is a mining area gas injection pipeline combination; 22 is a gas injection pipe combination of the self-ignition coal-hole coal bed gasification furnace; 23 is a gas injection roadway; and 24 is a sealing wall.
The specific implementation mode is that a mine ventilation shaft of the existing coal mine is used for constructing a central ventilation tunnel of the mine and a mining area gas injection ventilation tunnel, and the mining area gas injection ventilation tunnel is connected with a mine boundary air return tunnel and a mine boundary air return shaft to form a mining area ventilation system. And simultaneously, constructing a mine gas transportation shaft at two sides of the mine and a mine gas transportation roadway connected with the mine gas transportation shaft. And constructing a mining area gas transportation coal roadway and a gasification coal roadway in each coal layer of the coal seam group from the mining area gas injection ventilation roadway, wherein each mining area gas transportation roadway is connected with a mine gas transportation roadway to form a mining area gas transportation system. And finally, constructing a gas injection roadway drilling combination of gasification coal holes in the coal seam at the top of each coal seam group of the coal gas production units and a gas injection pipe combination in the gas injection roadway drilling combination to finish the project of the first mining area and start to produce the coal gas.
Claims (10)
1. In the mine, the self-ignition coal hole coal bed gasification furnace type mining area produces coal gas in the coal bed, and is characterized in that: the lower two ends of a coal seam group in a mine are sequentially connected with a mine ventilation roadway and a gas injection roadway of a mining area of a mine ventilation shaft, upward inclined gas injection rock holes, a gasified coal roadway in the coal seam group at the lowest part, vertical gas injection rock holes penetrating through the gasified coal roadways in the coal seams of the coal seam group, the gasified coal roadway in the coal seam group at the uppermost part and the gasified coal holes in the coal seams at the two sides of the gasified coal roadway are sequentially connected to form a gas injection roadway drilling combination of the coal seam gasification furnace; the gasified coal roadways in each coal layer of the coal layer group are equal in length, and are respectively and sequentially connected with a coal gas transportation coal roadway of a mining area, a coal gas transportation roadway of a mine, a coal gas transportation shaft of the mine and the ground in a coal layer on a vertical plane to form a coal gas transportation system of the mining area, wherein the roadway and the coal roadway in the system are supported by U-shaped steel telescopic metal brackets; coal conveying coal roadway of mining area in each coal layer of the coal seam group is positioned above and parallel to the gas injection ventilation roadway of the mining area; the gas injection ventilation roadway of the mining area is internally provided with a gasifying agent oxygen pipeline, a gasifying agent steam pipeline, a compressed air pipeline, a carbon dioxide pipeline and a water pipe which are provided with a plurality of switch valves, so that a mining area gas injection pipeline combination is formed.
2. The in-mine self-igniting coal bore gasifier-type mining area of claim 1 producing coal gas from a coal seam, characterized by: the coal bed gasification furnace is characterized in that the coal bed gasification furnace is drilled along a gas injection roadway of the coal bed gasification furnace to form a whole length, a gas injection pipe is arranged, one end of the gas injection pipe is connected with each pipeline of a mining area gas injection pipeline combination in a mining area gas injection ventilation roadway, and the other end of the gas injection pipe is a gas injection pipe orifice positioned at the end part of a gasification coal hole; a flame spray pipe is arranged in the whole length of the gas injection pipe, one end of the flame spray pipe is connected with a flame spray container in a gas injection ventilation roadway of a mining area, and the other end of the flame spray pipe is connected with a flame sprayer at a gas injection pipe orifice at the end part of a gasified coal hole; a gas sampling pipe is arranged in the gas injection pipe, one end of the gas sampling pipe is positioned on a monitoring table in a gas injection ventilation roadway of a mining area, and the other end of the gas sampling pipe penetrates through the wall of the gas injection pipe and extends out of the gas injection pipe at the position where a gasified coal hole is connected with the gasified coal roadway; the gas injection pipe, the flaming agent pipe, the gas sampling pipe, the flame injector and the flaming agent container form a gas injection pipe combination of the coal bed gasification furnace; the gasification coal hole and the gas injection pipe connected with the gasification coal hole are combined to form a self-ignition coal hole coal bed gasification furnace; personnel operate in a gas injection ventilation roadway of a mining area, simultaneously inject oxygen and water vapor into a gas injection pipe, inject a flame spraying agent into a flame spraying agent pipe, wherein the flame spraying agent is naturally sprayed by a flame sprayer and then detours with the oxygen to form flame, the flame ignites coal on the wall of a gasified coal hole, a coal hole coal bed gasification furnace produces coal gas, and the coal gas flows into a coal gas transportation system of the mining area and flows to the ground along the full sections of the coal roadway, the roadway and a shaft of the system; the coal around the gasified coal hole is continuously gasified and consumed to form a goaf with continuously enlarged area.
3. The in-mine self-igniting coal bore gasifier-type mining area of claim 1 producing coal gas from a coal seam, characterized by: the coal seams at two sides of a gasified coal roadway in the coal seam group at the top are respectively provided with a plurality of gasified coal holes, and each gasified coal hole is connected with 1 gas injection roadway hole combination and a gas injection pipe combination in the gas injection roadway hole combination to form 1 self-ignition coal seam gasification furnace; a plurality of self-ignition coal bed gasification furnaces in 1 gasification coal roadway produce coal gas simultaneously; and finishing the gasified coal roadway after the coal gas is produced, and gasifying and consuming the coal of the coal beds on the two sides to form a gasified coal roadway goaf.
4. The in-mine self-igniting coal seam gasifier-type mining area of claim 1, producing coal gas in a coal seam, characterized by: dividing the coal seam group in the mining area into a plurality of coal gas production units which are equal in length and are connected with each other along the whole length of a gas injection ventilation roadway of the mining area and a coal transportation roadway of the mining area in each coal seam of the coal seam group; in each coal gas production unit, a gas injection ventilation roadway of a mining area is connected with 1 gas injection roadway on each of two sides of the mining area, a coal gas transportation coal roadway in each coal seam of a coal seam group is connected with one gasification coal roadway with equal length on each of two sides of the coal seam group, and a plurality of gasification coal holes are formed in the coal seams on two sides of each gasification coal roadway; in each coal gas production unit, a plurality of coal-hole coal-bed gasification furnaces are arranged in a gasification coal roadway in a coal bed at the uppermost part of a coal bed group, and a vertical pipe fitting in a gas injection pipe combination connected with each 1 coal-hole gasification furnace penetrates through the gasification coal roadway in each coal bed.
5. The in-mine self-igniting coal bore gasifier-type mining area of claim 1 producing coal gas from a coal seam, characterized by: coal seams in the mining area are sequentially produced from top to bottom layer by layer, and the uppermost coal seam of the coal seam group is a first mining coal seam; 2 gasification coal roadways of each coal gas production unit in the same coal seam sequentially take over to produce coal gas according to the same direction as the flowing direction of the coal gas in the coal gas transportation coal roadway of the mining area; an isolating coal pillar of which the coal of the coal seam is not gasified is reserved between the gasified coal roadway goafs of the adjacent coal gas production units in the same coal seam to support the hard rock stratum above the gasified coal roadway goafs on the two sides of the isolating coal roadway not to deform and seal each coal seam gasification furnace and the gasified coal roadway goafs; after the coal gas production of 1 coal seam in the coal seam group is finished, stopping the coal gas production of the mining area, the mine coal gas transportation roadway and the mine coal gas transportation shaft which are communicated with the mining area, enabling personnel to enter each gasification coal roadway of the lower coal seam adjacent to the production stop coal seam, constructing a plurality of gasification coal holes in the coal seams at two sides of the mining area, cutting off each pipe fitting in each gas injection pipe combination exposed in the gasification roadways, completing the project that each gas injection pipe combination extends to the gasification coal holes, and constructing a self-ignition coal seam gasification furnace in the coal seam successive production.
6. The self-igniting coal seam gasifier-type mining area of claim 1, producing coal gas from a coal seam, characterized by: the gasification mine for producing coal gas, the mine air inlet ventilation shaft and the mine air return ventilation shaft which are close to each other are respectively connected with the mine central air inlet ventilation roadway and the mine central air return ventilation roadway which are close to each other and parallel, and the mine is divided into two sides; 1 mine gas transportation shaft at each side of the mine is connected with the mine gas transportation roadway at the side, and the upper 2 mine gas transportation shafts are close to each other to share a ground gas production facility; each side of the mine is respectively provided with a plurality of mining areas for replacing construction engineering and producing coal gas, the mining areas of each side are provided with gas injection ventilation tunnels, the uniform end of each mining area is connected with a central air inlet ventilation tunnel of the mine, and the other end of each mining area is sequentially connected with a mine boundary air return tunnel and a mine boundary air return shaft of the side to form independent ventilation systems at two sides of the mine; the mine air inlet ventilation shaft adopts a ventilation mode that ground air is pressed into the shaft; each coal gas transportation roadway of the mining area on each side of the mine is connected with the coal gas transportation roadway of the mine on the side to form independent coal gas transportation systems on two sides of the mine; during the coal gas production period of the mining area at one side of the mine, stopping producing the coal gas at the other side of the mine, and converting into the engineering of replacing the coal gas production by construction; on one side of a mine for producing gas, an air injection ventilation tunnel of an inner mining area is communicated with a mine gas transportation tunnel and an upward tunnel of a mining area gas transportation coal tunnel, and a sealing wall, a sand bag sealing wall and a water column from bottom to top are sequentially connected.
7. The in-mine self-igniting coal bore gasifier-type mining of claim 1 producing coal gas from a coal seam, characterized by; each mine gas transportation shaft is respectively connected with 1 ground exhaust fan. Before each coal seam in a mining area starts to produce coal gas, a ground exhaust fan communicated with the coal seam is started to pump air in each gasified coal roadway, the coal gas transportation coal roadway of the mining area and a mine gas transportation roadway and a mine gas transportation shaft connected with the coal gas transportation coal roadway in the coal seam, and simultaneously, carbon dioxide is injected into a gas injection pipe of a coal seam gasification furnace of each gasified coal roadway of the coal seam to synchronously replace the air. When 2 gasification coal roadways of 1 coal gas production unit in the coal seam for producing coal gas finish the coal gas production, each coal seam gasification furnace stops injecting oxygen and water vapor, and each gas injection pipe is changed to inject water, the water is evaporated into water vapor in the goaf of the coal seam gasification furnace, and high-heat coal gas remained in the goaf of the gasification coal roadways is replaced; and when no gas exists in the gas sample collected by the gas sampling pipe of each coal-bed gasification furnace, stopping injecting water into the gas injection pipe of each coal-bed gasification furnace, injecting carbon dioxide, replacing water vapor in the goaf of the gasified coal roadway, and keeping the air pressure in the goaf of the gasified coal roadway equal to the air pressure in the coal gas transportation coal roadway of the mining area.
8. The in-mine self-igniting coal seam gasifier-type mining area of claim 1, producing coal gas in a coal seam, characterized by: regulating and controlling the air inlet pressure of an atmospheric air pressing type fan connected with a mine air inlet shaft to ensure that the air pressure in a gas injection ventilation roadway of a coal mining area for producing coal gas is equal to the air pressure of coal gas in a gasification coal roadway for producing coal gas; filling materials are filled in and sealed in the upward inclined gas injection rock hole and the vertical gas injection rock hole, and the hole between the hole wall and the wall of the gas injection pipe; in the gas injection rock roadway, a closed wall is arranged to seal the upward inclined gas injection rock holes, and a carbon dioxide gas injection pipe is arranged on the closed wall to regulate and control the amount of carbon dioxide injected into the end part of the gas injection rock roadway, so that the gas pressure on two sides of the closed wall is equal to that in the gasification coal roadway.
9. The in-mine self-igniting coal seam gasifier-type mining area of claim 1, producing coal gas in a coal seam, characterized by: a gasifying agent vapor pipeline connected with a ground boiler is laid along a mine gas transportation shaft, a mine gas transportation roadway, a mining area gas transportation coal roadway, rock holes reaching the end parts of all gas injection pipelines, all gas injection roadways and a mining area gas injection ventilation roadway and is connected with the gasifying agent vapor pipeline in the mining area gas injection ventilation roadway, and the vapor pipeline is provided with 1 normally-closed valve corresponding to each gas production unit; in the initial stage of producing coal gas in 2 gasified coal roadways of the first coal gas production unit of each coal seam of the mining area, compressed air and oxygen are injected into the coal seam gasification furnace with each coal hole to produce oxygen-enriched coal gas so as to heat the coal roadways, the roadways and the mineshafts of the coal gas transportation system of the mining area, and after the temperature of the coal roadways, the roadways and the mineshafts of the coal gas transportation system of the mining area is increased, water vapor is used for replacing the compressed air.
10. The in-mine self-ignition coal-hole coal seam gasifier-type mining area as claimed in claims 1 and 2, producing coal gas in a coal seam, characterized by: the gas injection roadway drilling combination of the self-ignition coal hole coal seam gasification furnace of the uppermost coal seam in the gas production unit is formed by sequentially connecting a gas injection ventilation roadway of a mining area, a gas injection roadway, a vertical gas injection pipe well at the end part of the gas injection roadway, a coal transportation roadway and a gasification coal roadway of the mining area in the lowermost coal seam of a coal seam group, a vertical gas injection rock hole penetrating through the gasification coal roadway in each coal seam of the coal seam group, the gasification coal roadway in the coal seam group at the upper part of the coal seam group and the gasification coal holes in the coal seams at two sides of the coal seam group; a gas injection pipe combination is arranged in the whole length of the gas injection roadway drilling combination of the self-ignition coal-hole coal bed gasification furnace; the gasified coal hole and the gas injection pipe connected with the gasified coal hole are combined to form a self-ignition coal hole coal bed gasification furnace; the gasification coal roadway in the coal seam on the top of the coal seam group is provided with a plurality of gasification coal holes to form a plurality of self-ignition coal hole coal seam gasification furnaces, a plurality of gas injection pipes are combined and pass through a vertical gas injection pipe sub-well, and gaps between the well wall of the vertical gas injection pipe sub-well and each gas injection pipe and gaps between each gas injection pipe are filled with fillers for plugging.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305809A (en) * | 2020-03-11 | 2020-06-19 | 中国矿业大学(北京) | Underground gasification method for coal mine section protection coal pillar |
| CN112963137A (en) * | 2021-03-15 | 2021-06-15 | 中国矿业大学(北京) | Underground gasification method for steeply inclined coal seam with inclination angle of more than 70 degrees and coal thickness of less than 5m |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305809A (en) * | 2020-03-11 | 2020-06-19 | 中国矿业大学(北京) | Underground gasification method for coal mine section protection coal pillar |
| CN111305809B (en) * | 2020-03-11 | 2021-02-02 | 中国矿业大学(北京) | Underground gasification method for coal mine section protection coal pillar |
| CN112963137A (en) * | 2021-03-15 | 2021-06-15 | 中国矿业大学(北京) | Underground gasification method for steeply inclined coal seam with inclination angle of more than 70 degrees and coal thickness of less than 5m |
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