WO2022262261A1 - Coalbed methane and coal gas mine - Google Patents

Abstract

A coalbed methane coal gas mine is disclosed. In the mine, a plurality of coalbed methane and coal gas stoping working faces alternately take over production. Each work face first extracts coalbed methane from a working face coal seam by using an isobaric coalbed methane extraction hole (11). Then, in a ventilation and gas injection coal tunnel (8) for extracting the coalbed methane, a gasification agent oxygen pipeline and a gasification agent water vapor pipeline are installed. A working face coal gas coal channel (9) in the working face coal seam connects a plurality of gasification coal channels (10, 28). A plurality of mine gasification furnaces are arranged on the two sides of each gasification coal channel. An air injection pipe (30) of each mine gasification furnace is connected to an oxygen pipeline and a water vapor pipeline in the ventilation coal channel. After an electric furnace in each mine gasification furnace is ignited, oxygen and water vapor are injected by means of the gas injection pipeline to produce coal gas, and the coal gas sequentially flows into the gasification coal channel, the working face coal gas coal channel, and a coal gas wellbore to reach a ground pipeline. The present mine is suitable for various coal seam geological conditions.

Description

Coalbed Gas Mine technical field

The invention relates to the production of coal bed gas and coal gas in a coal seam in a mine, which belongs to the mining technology.

Background technique

Existing mines built in coal fields produce coal, which pollutes the environment during utilization.

The existing technology for exploiting coalbed methane in the coal seam is to drill holes from the ground to the coal seam, which has the problems of low output, high investment and high cost, and all countries in the world have stopped testing.

The existing technology for producing coal gas from coal seams is called "underground coal gasification". The coal seam is drilled from the ground, which has the problems of low output, high investment, and cost quotient. Countries around the world have stopped testing.

Contents of the invention

The purpose of the coalbed methane gas mine of the present invention is to expand the production capacity of coalbed methane and coal gas, thereby reducing investment and cost.

Implement the present invention, limit the central part of the minefield mining coal seam range along the coal guide direction, there is a pair of central ventilation shafts close to each other, each central ventilation shaft is respectively connected to a central ventilation coal lane inclined along the coal seam in a coal seam, and the mine field is divided into On the two wings of the mine, the two wings of the mine take turns to produce gas and construct the project to take over the production of gas; on both sides of the coal seam along the minefield boundary line inclined by the coal seam, there is a boundary ventilation coal lane connecting the boundary ventilation shaft; at the bottom of the above four coal lanes, connecting A mine ventilation coal lane along the direction of the coal seam in the coal seam constitutes independent ventilation systems for the two wings of the mine. In the shaft and roadway of this system, there are coalbed methane extraction pipelines connected to the vacuum pump on the ground, and gasification agent oxygen and water vapor transportation pipelines , people work in the system in the center; each wing of the mine is close to the central air intake shaft, and there is a gas shaft for gas flow and transportation along its full section. Mine gas rock roadway transported; coalbed methane gas mines with coalbed methane and coal gas as mining products are composed of shafts on both sides of the mine field, coal roadways, rock roadways and production systems.

Implement the present invention, the mine coal seam is divided into a plurality of coalbed methane coal gas mining areas (hereinafter referred to as mining areas in this application document) along the coal seam inclination; The two ends of the coal lane connect the central ventilation coal lane and the boundary ventilation coal lane. Personnel monitor the coalbed methane and gas production process in the coal lane; in the mining area ventilation and gas injection coal lane, there is a coalbed methane extraction along its entire length. Production pipelines, coalbed methane gas injection pipelines, gasification agent oxygen pipelines, gasification agent water vapor pipelines, compressed air pipelines, carbon dioxide pipelines, water pipelines and power cables constitute the pipeline combination in the mining area; gasification agent water vapor pipelines pass through the rock The hole enters the mine gas rock roadway, and is laid along the mine gas rock roadway and gas shaft; the mining area ventilation gas injection coal roadway on each wing of the mining area, and the coal seam of the working face between each dividing line on both sides constitute a coalbed gas The gas recovery working face (hereinafter referred to as the working face in this application), there are multiple working faces on the two wings of the mining area. When the working face of one wing is producing gas, the working face of the other wing will be constructed; 1. The central ventilation well shaft leads to the ground, which is connected to the coalbed methane extraction vacuum pump and the coalbed methane user pipe network in turn; the underground coalbed methane gas injection pipeline parallel to the coalbed methane extraction pipeline is connected to the user's coalbed methane pipe network on the ground; Both sides of the gas coal roadway are connected to multiple coal bed roadways in the drilling site; each drilling site coal roadway is connected to the coalbed methane extraction coal hole in the coal seam of the working face, and the coalbed methane extraction pipe inserted in the coal hole is connected to the coalbed methane extraction Pipeline, the gap between the pipe and the hole wall is filled with fillers to seal the coalbed methane extraction coal hole; there is a closed wall in the coal roadway of each drilling site, and the closed wall and the end of the coal roadway in the drilling site form an isobaric coal roadway; The coalbed methane gas injection pipe of the coal roadway is connected to the coalbed methane gas injection pipeline; the connection between the coalbed methane extraction pipe and the coalbed methane extraction pipeline is opened, and the coalbed methane in the coal seam of the working faces on both sides of the gas injection coal roadway in the mining area is pumped in turn. After entering the coalbed methane extraction coal hole, coalbed methane extraction pipe, coalbed methane extraction pipeline, and coalbed methane extraction vacuum pump, it is discharged into the user's coalbed methane pipeline network pipeline; at the same time, the coalbed methane gas injection pipe and coalbed methane gas injection pipeline are opened Inject coalbed methane into the coal roadway with equal pressure, increase or decrease the gas injection flow rate, keep the air pressure in the coal roadway on both sides of the closed wall constant, and stop the gas exchange.

Implement the present invention, in the coal seams of each working face on both sides of the ventilation gas injection coal roadway in the mining area, there is respectively a gas coal roadway on the working face that is close to, parallel to, and equal in length to the gas injection coal roadway in the mining area, and one end of the gas coal roadway is connected to the gas inlet in turn. Xiangyan roadway, mine gas rock roadway, gas shaft; the gasification coal roadway of the working face connects multiple ends in the coal seam of the working face to the mining boundary line, and connects multiple gasification coal roadways on both sides of each gasification coal roadway Mine gasifier coal lane or mine gasifier coal hole, the coal in the mine gasifier coal lane or the coal seam on both sides of the mine gasifier coal hole is gasified to produce coal gas, and the gas flows into the gasification coal lane and working face gas coal in sequence Alleys, coal gas upward rock alleys, mine gas rock alleys, and gas shafts are transported along the entire section of the above-mentioned shafts and roadways to the surface pipelines; along the entire length of the gasification coal roadway, they are divided into multiple furnace groups; within each furnace group, the The gas injection pipes in the coal lanes of adjacent mine gasifiers or coal holes of mine gasifiers are connected to the same main gas injection pipe. The main gas injection pipe passes through the coal pillars along the gasification coal lanes and reaches the ventilation gas injection coal lanes in the mining area. , and connect the pipes in the pipeline combination in the mining area; the gasification coal roadway and the mine gasifier and main gas injection pipe on both sides constitute the gasification coal roadway combination; the furnace group at the end of the gasification coal roadway The adjacent furnace groups take over the production of gas in sequence; at the opening of each gasification coal roadway, there are monitoring pipes passing through the coal pillar to the ventilation gas injection coal roadway in the mining area, and there are devices in the monitoring pipe for collecting gas samples and collecting gas temperature, pressure and other parameters ; During the construction of gasification coal lanes on the working face, the gasification coal lanes are connected to the boundary ventilation coal lanes to form a ventilation system with the gas shaft; One end is connected successively with sandbag explosion-proof airtight wall, explosion-proof airtight wall, carbon dioxide coal lane, airtight wall, compressed air coal lane, airtight wall, working face gas coal lane, and boundary ventilation coal lane; the gas injection pipe inserted into the carbon dioxide coal lane And the gas injection pipe inserted into the compressed air coal lane, inject carbon dioxide and compressed air into the coal lane respectively, and adjust the gas injection flow rate, so that the air pressure in the compressed air coal lane and the carbon dioxide coal lane is always equal to the air pressure in the gas coal lane of the working face. The above constitutes a combination of isobaric explosion-proof and leak-proof airtight walls, which are used for the coal hole joints between each ventilation roadway and gas roadway in this application document; Refractory brick support ring; there is a steel plate support ring close to the refractory brick support ring; there is an electric furnace heating in the coal hole coalbed methane shaft; there is an upright metal gas combustion cylinder in the mine gas rock tunnel, and there are combustion pipes and The electric furnace, the combustion tube and the asbestos insulated cable of the electric furnace lead to the central ventilation coal lane; the electric furnace heats the gas in the combustion tube to above its ignition point, the combustion tube injects oxygen and carbon dioxide into the combustion tube, the gas in the barrel ignites spontaneously, and the mine gas rocks the tunnel The gas inside burns to form a torch, keeping the temperature of the gas above the condensation point.

Implement the present invention, the coal gas coal roadway of the working face is successively connected to the horizontal coal roadway of the test mine gasifier in the coal seam of the working face, and the vertical coal roadway of the mine gasifier to reach the upper rock layer of the coal seam; it is close to the end of the horizontal coal roadway of the mine gasifier There are refractory brick walls on the coal wall of the upper part and the vertical coal roadway connected to it; along the entire length of the horizontal coal roadway of the test mine gasifier, there is a lower gas injection pipe; along the entire length of the horizontal coal roadway and the vertical coal roadway of the mine gasifier , with an upper gas injection pipe; the above two gas injection pipes pass through the coal pillar to reach the ventilation gas injection coal roadway in the mining area, and connect each pipeline in the pipeline combination of the mining area; the nozzle of the upper gas injection pipe is closed with a cover plate, and the lower pipe There are gas injection holes in the wall; there is a wooden barrier at the end of the horizontal coal lane of the test mine gasifier, and there is an electric furnace under the wooden barrier, and the asbestos insulated cable connected to the electric furnace can reach the ventilation and gas injection coal lane in the mining area; The electric furnace heats the temperature of the coal wall of the coal roadway to above the ignition point of coke; the gas injection pipe injects oxygen and water vapor, and the coal on the wall of the coal roadway of the log and mine gasifier is ignited by oxygen spontaneous combustion, and the gas produced by the mine gasifier is tested. Enter the gas coal lane, gas rock lane, gas shaft in the working face in turn, and flow to the pipeline on the ground; in the mine gasifier coal lane, the gas flow inside and outside the gas injection pipe is opposite; the mine gasifier coal lane, gas injection pipe and The ignition device constitutes a coal lane mine gasifier that is ignited by a reverse gas injection electric furnace; at the opening of the mine gasifier coal lane, there is a monitoring pipe leading to the ventilation gas injection coal lane in the mining area; in the monitoring pipe, there are gas sampling, gas temperature, and pressure monitoring Device; the coal in the coal seams on both sides of the mine gasifier coal roadway is continuously gasified and consumed, forming a continuously expanding pear-shaped goaf; when the gas quality declines, the gas injection pipe is first changed to water injection to generate a large amount of water vapor to replace the goaf After the continuous injection of carbon dioxide to keep the gas from entering the mining area.

Implement the present invention, test the end of the coal mine coal seam gasification furnace coal roadway in the coal roadway, there is a gasification coal hole perpendicular to it on both sides, there is a gas injection branch pipe connected to the horizontal gas injection pipe in each gasification coal hole, each injection The nozzle of the gas branch pipe is the gas injection point; after the temperature of the coal roadway wall of the test coal roadway mine gasifier is heated by the electric furnace to reach the ignition point of coke, the water vapor and oxygen injected into the horizontal gas injection pipe exit the nozzle of each gas injection branch pipe. , flow along the gasification coal hole to the gasification coal roadway, and the coal on the wall of the wooden wall and the coal roadway spontaneously ignites with oxygen; the flame moves to the nozzle of the gas injection branch pipe along the gasification coal hole wall, against the flow direction of oxygen, and the coal The gasification reaction is carried out on the convex gasification reaction coal wall formed by the gasification coal hole wall and the coal roadway wall to produce coal gas.

To implement the present invention, the coal gas lane of the working face is connected to the gasification coal hole of the test coal hole in the coal seam of the working face and the gasification coal hole of the mine gasifier. There is a gas injection pipe along the full length of the coal hole. Gas-coal roadway, and connect the pipelines in the mining area pipeline combination; there are asbestos insulated armored cables in the gas injection pipe; there are wooden blocks at the end of the coal hole, and there are armored cables in the spiral grooves on the wooden blocks. The electric furnace unit system; the other end of the armored cable passes through the coal pillar to the ventilated gas injection coal lane in the mining area, and connects the cables inside; the electric furnace is turned on to heat the coal on the wall of the gasification coal hole to the temperature of coke Above the ignition point; the gas injection pipe first injects water vapor to replace the gas in the gasification coal hole, and then injects oxygen and water vapor, and the coal on the wall of the gasification coal hole spontaneously ignites to produce gas; the gas flows into the gas coal lane and gas rock lane of the working face , gas shaft to the ground; gasification coal hole, gas injection pipe, and electric furnace, forming a coal hole mine gasifier for ignition by reverse gas injection electric furnace; test coal lane near the gasification coal hole, connected to the gas coal lane of the working face; test coal lane There are multiple test coal holes leading to the gasification coal hole; the test coal hole has a test tube along the test coal roadway and passes through the coal pillar to the ventilation gas injection coal roadway in the mining area. The gas sample is collected and the gas temperature and pressure are monitored in the tube. and transmit the device.

To implement the present invention, a pair of central ventilation shafts pass through the coal seam and connect a pair of central ventilation rock roadways inclined along the coal seam in the rock layer below the coal seam; two boundary ventilation shafts pass through the coal seam and connect to the boundary ventilation rock roadway in the rock layer below the boundary line ; Mine ventilation horizontal rock roadway connects the bottom of the above four ventilated rock roadways to form independent ventilation systems in the rock formations of the two wings; both ends of the ventilation gas injection coal roadway in each mining area, downward to the rock roadway, connect the boundary ventilation rock roadway and the central ventilation Rock roadway; in the rock formation directly below the ventilation and gas injection coal roadway in each mining area, there are two ends respectively connecting the boundary ventilation rock roadway and the central ventilation rock roadway in the mining area ventilation horizontal rock roadway; the mining area ventilation horizontal rock roadway and the mining area ventilation gas injection The coal roadway is connected by multiple upward rock roadways to form two sets of ventilation systems on the working face, and personnel work in the system; each wing of each mining area has a mining area gas shaft close to the central ventilation rock roadway; The above shafts, rock roadways, and coal rocks constitute the rock roadway type coalbed methane gas mine below the coal seam; there are multiple coalbed methane extraction coal holes in the coal seam of the two working faces on both sides of the ventilation and gas injection coal roadway in the mining area. , Drain the coalbed methane in the coal seam of the working face.

Implement the present invention, each working face of each wing of mining area is divided into a plurality of gasification sections along the full length of coal seam trend, and each gasification section of each wing produces coal gas in turn; From the center to the boundary of the mine field, the production of gas is successively replaced in sequence; the gas coal lanes of the working faces of each working face are divided into multiple gasification section working face gas coal lanes, and there are coal pillars between the adjacent gasification section working face gas coal lanes. Open; in the rock formation directly below the gas coal roadway in the working face of each gasification section, there is a gas rock roadway in the working face parallel to it; the gas rock roadway in each working face is connected with the gasification section working face gas There are gas water gates in the coal roadway and gas horizontal rock roadway; the gas rock roadway in each gasification section is connected with the ventilated rock roadway and the ventilated horizontal rock roadway in the mining area, and there are ventilation water gates in the ventilated horizontal rock roadway; The coal gas rock roadway in the first mining gasification section of the two working faces in each wing of the mining area is connected to the gas shaft in the mining area; the coal gas rock roadway in the working face of the adjacent gasification section is connected to the first gasification section when producing gas Coal gas and rock lanes at the working face; the gas produced by the mine gasifiers in each gasification coal lane in each gasification section flows through the gasification coal lanes, the gas coal lanes at the working face of the gasification section, the gas upward rock lanes, the working Face gas rock roadway, gas well shaft on the working face to the ground pipeline; when the gas production of each gasification section ends, the gas water gate connected to it is closed, and the gas goes up to the rock roadway and is always filled with water, closing and scrapping the gasification section; gasification When the section starts to produce gas, all the ventilation water gates are closed, and the filling is filled into the rock roadway under the ventilation; the gas rock roadway on the working face has drainage rock holes to connect the ventilation rock roadway in the mining area.

In the implementation of the present invention, the gas well shaft in each mining area is connected to the air extractor on the ground; before the gasification section of each wing of the mining area produces gas, the air extractor is turned on to exhaust the gas shaft in the mining area, the gas rock roadway of the working face, and the working face of the gasification section. The air in the gas system composed of gas coal lanes, gasification coal lanes and coal seam mine gasifier coal lanes; at the same time, the gas injection pipes of each coalbed gasifier in the gasification section inject carbon dioxide with the same total flow rate, Air replacement; when the gasification section ends the gas production, the induced draft fan exhausts the remaining gas in the gas system, and the gas injection pipes of each mine gasifier in the gasification section inject equal flow of carbon dioxide to replace the gas.

Implement the present invention, 2 mining area gas well shafts close to each other in each mining area pass through the coal seam and the elevation of the central ventilated rock roadway, and the bottom of the shaft is connected with the ventilated rock roadway to form a ventilated mine; Connect and construct the ventilation rock roadway and the central ventilation rock roadway in the mining area of the wing at the elevation; connect and construct the gas rock roadway in the first gasification section working face of the wing at the elevation of the gas rock roadway in the first gasification section; Before the mining area is put into production, there are sluice walls in the rock alleys of each mining area, and there are water discharge pipes on the sluice walls to connect the gas shafts in the mining area; there are sluice walls in the ventilated rock alleys; The face gas rock roadway is filled with water and sediment below the elevation, and the height of the water surface is regulated by regulating the discharge flow of the discharge pipe.

Implement the present invention, there are two mining area ventilation gas injection coal lanes along the coal seam direction in the two wing coal seams of the mining area. The coal seam on both sides of the gas injection coal roadway is a working face; each working face and the gas injection coal roadway in the mining area are close to the parallel and equal-length gas coal roadway of the working face, which are successively connected to the gas downward rock roadway, gas horizontal rock roadway, There are coal gas rock roadways and gas shafts in the mining area parallel to it in the strata directly above the ventilated rock roadways in the mining area; each gas horizontal rock roadway has an airtight wall to seal the scrapped working face gas coal roadways.

Implement the present invention, the working face gas coal roadway is located on the boundary of the mining area along the direction of the coal seam, and one end is connected to the mine gas rock roadway and the gas shaft; the mining area ventilation gas injection coal roadway, the working face coal seam, and the working face gas coal roadway are connected sequentially It constitutes the coalbed methane coal gas working face in the middle working face; there are coalbed methane extraction pipelines and coalbed methane gas injection pipelines in the gas coal lane, which are respectively connected to the vacuum pump on the ground and the coalbed methane user pipe network pipeline; The gas extraction coal holes are respectively connected to the nearby ventilation and gas injection coal lanes in the mining area and the gas coal lanes in the working face; Ventilation and gas injection coal roadway close to the mining area; each main gas injection pipe in the gasification coal roadway passes through the coal pillar at the end to reach the ventilation and gas injection coal roadway in the mining area, and connects the pipelines in the pipeline combination of the mining area; each gasification coal roadway The furnace group at the end is the first mining furnace group, and each adjacent furnace group takes over to produce gas in sequence; there is a party normally closed damper at the connection between the mining area ventilation gas injection coal lane and the central ventilation coal lane; the mining area ventilation gas injection coal lane connects Ventilated inclined coal lane, central ventilated coal lane, there is a blower in the central ventilated coal lane connected to the ventilated inclined lane to supply air to the ventilation and gas injection coal lane in the mining area; adjust the air supply flow and air supply pressure to maintain the ventilation and gas injection coal in the mining area The air pressure in the lane is equal to the air pressure at the end of the gasification coal lane.

Advantages of the present invention. Coal mines have changed from producing coal that pollutes the environment to producing clean energy such as coal bed methane and coal gas.

detailed description. Existing mines are converted from coal production to coal bed methane and coal gas production. At first will according to claim 4 and 5, 6, set up the test engineering coal roadway, test the various technical parameters of mine gasifier, for mine technical transformation.

Description of drawings

Figure 1: Coal bed methane gas mine map of rock roadway above the coal seam

In the figure 0 is the working face; 1 is the central ventilation shaft; 2 is the central ventilation shaft; 3 is the boundary ventilation shaft; 4 is the boundary ventilation coal road; 5 is the boundary line of the mining area; 6 is the mine gas shaft; 7 is the gas rock 8 is the ventilation and gas injection coal lane of the mining area; 9 is the gas coal lane of the working face; 10 is the gasification coal lane; 11 is the coalbed methane extraction coal hole; 19 is the mine ventilation coal lane.

Figure 2: Sectional view of the mining area along the gas coal roadway of the working face

In the figure, 2 is the central ventilation coal lane; 4 is the boundary ventilation coal lane; 7 is the gas rock lane; 9 is the gas coal lane of the working face; wall; 14 is a carbon dioxide airtight wall; 15 is a compressed air airtight wall; 47 is a coal seam.

Figure 3: Coalbed methane extraction device diagram of the working face

In the figure, 8 is the ventilation and gas injection coal roadway in the mining area; 11 is the coalbed methane extraction coal hole; 19 is the coalbed methane drainage pipe; 20 is the coalbed methane extraction pipe; 21 is the airtight wall; 24 is a coalbed methane extraction pipeline; 25 is a coalbed methane gas injection pipeline; 26 is a filler.

Figure 4: Combination diagram of gas and coal lanes

In the figure, 8 is the ventilation gas injection coal roadway in the mining area; 27 is the pipeline combination in the mining area; 28 is the gasification coal roadway; 29 is the mine gasifier coal roadway; 30 is the gas injection pipe; 31 is the main gas injection pipe; 32 is the mine Gasifier coal hole; 33 is the boundary line of the mine gasifier goaf.

Figure 5: Plane view of coal bed gasifier test device

In the figure, 4 is the boundary ventilation coal roadway; 7 is the gas rock roadway; 8 is the mining area ventilation gas injection coal roadway; 9 is the working face gas coal roadway; 12 is the sandbag airtight wall; Airtight wall; 15 is the outer airtight wall; 16 is carbon dioxide equal pressure coal lane; 17 is compressed air equal pressure coal lane; 34 is carbon dioxide gas injection pipe; 35 is compressed air gas injection pipe; 29 is test mine gasifier coal lane; 30 32 is the coal hole for testing the mine gasifier; 33 is the boundary line of the mine gasifier goaf; 36 is the monitoring coal roadway; 37 is the monitoring coal hole, and 38 is the monitoring pipe.

Figure 6: Structural diagram of reverse gas injection electric furnace ignition coal roadway mine gasifier

In the figure, 28 is the gasification coal lane; 29 is the mine gasification coal lane; 30-1 is the lower gas injection pipe; 30-2 is the upper gas injection pipe; 31 is the main gas injection pipe; 39 is the upward mine gasifier coal lane 40 is a vertical gas injection pipe; 41 is a refractory brick wall; 42 is an inverted wedge metal anchor; 43 is a vertical gas injection pipe cover plate.

Figure 7: Convex gasification reaction surface coal roadway mine gasifier

In the figure, 28 is a gasification coal lane; 29 is a mine gasification coal lane; 30 is a gas injection pipe; 44 is a gasification coal hole; 45 is a gas injection branch pipe; 46 is a mine gasification furnace gasification reaction coal wall.

Figure 8: Plane view of coalbed methane mining area of rock roadway type under the coal seam

In the figure, 9 is the coal roadway of the working face; 28 is the gasification coal roadway; 51 is the central ventilation rock roadway; 52 is the boundary ventilation rock roadway; 53 is the ventilation rock roadway in the mining area; District gas wells.

Figure 9: Diagram of coalbed methane extraction device in rock roadway type coalbed methane gas production area under the coal seam

In the figure, 8 is the ventilation gas injection coal roadway in the mining area; 11 is the coalbed methane extraction coal hole; 47 is the coal seam; 48 is the coal seam boundary line in the mining area; 49 is the ventilation rock roadway in the mining area, and 50 is the upward ventilation rock roadway.

Figure 10: Section A-A of Figure 8

In the figure, 8 is the ventilation gas injection coal roadway in the mining area; 9 is the gas coal roadway in the working face; 27 is the pipeline combination in the mining area; 28 is the gasification coal roadway; 31 is the main gas injection pipe; 47 is the coal seam; 48 is the boundary of the mining area 49 is the ventilation roadway in the mining area; 50 is the upward ventilation rock roadway; 54 is the gas rock roadway in the working face; 56 is the downward rock roadway; water gate.

Figure 11: Section of gas coal roadway in B-B working face in Figure 8

In the figure, 9 is the gas coal roadway in the working face of the gasification section; 28 is the gasification coal roadway; 47 is the coal seam; 48 is the boundary line of the mining area; 49 is the ventilation rock roadway in the mining area; 51 is the central ventilation rock roadway; Boundary ventilated rock alley; 54 is the coal gas rock alley of the working face; 55 is the gas shaft in the mining area; 56 is the gas downward rock alley; 58 is the ventilated upward rock alley; 59 is the water gate; 60 is the isolated coal pillar.

Figure 12: Sectional view of the rock roadway mining area under the coal seam of the ventilation and gas injection coal roadway in the double mining area

In the figure, 8 is the ventilation gas injection coal roadway in the mining area; 9 is the gas coal roadway in the working face; 28 is the gasification coal roadway; 47 is the coal seam; 49 is the ventilation rock roadway in the mining area; 50 is the ventilation upward rock roadway; 56 is the gas downward rock alley; 57 is the horizontal gas Shimenyan alley; 59 is the water gate; 60 is the isolated coal pillar; 61 is the ventilated horizontal Shimenyan alley.

Figure 13: Sectional view of coal seam type CBM gas recovery working face in the middle working face

In the figure, 8 is the ventilation coal roadway in the mining area; 9 is the gas coal roadway in the working face; 28 is the gasification coal roadway; 31 is the main gas injection pipe; 47 is the coal seam; 48 is the boundary line of the mining area; 49 is the ventilation rock roadway in the mining area ; 50 is the ventilation upward rock alley; 56 is the gas downward rock alley; 57 is the gas horizontal Shimenyan alley; 59 is the water gate; 60 is the coal pillar; 61 is the horizontal ventilation Shimenyan alley;

Claims (12)

Coalbed methane coal gas mine, in which the coal seam produces the contained coal seam gas first, and then produces the coal gas in the coal seam. It is characterized in that: in the center of the mine field that defines the range of the coal seam exploited by the mine along the coal conduction direction, there is a pair of central ventilation shafts that are close to each other. The ventilation shafts are each connected to a central ventilation coal roadway in the coal seam that is inclined along the coal seam, and the mine field is divided into two wings of the mine. , each has a boundary ventilation coal lane connected to the boundary ventilation shaft; the bottom of the above four coal lanes is connected to a mine ventilation coal lane in the coal seam along the coal seam, forming independent ventilation systems for the two wings of the mine. There are coalbed methane extraction pipelines connected to vacuum pumps on the ground, and gasification agent oxygen and water vapor transportation pipelines, which work in the central system; each wing of the mine is close to the central air intake shaft, and each has a gas flow transport along its entire section Gas well shaft, the well shaft is connected to the rock formation above the coal seam, and the coal gas inclined along the coal seam flows and transports along its entire cross-section; the well shaft on both sides of the mine field, the coal road, the rock road and the production system constitute the mining of coal bed methane and coal gas. Products of CBM gas mines. Coalbed methane coal gas mine as claimed in claim 1, wherein the coalbed gas contained in the coalbed is produced first, and then the coalbed gas is produced in the coalbed, and it is characterized in that: the mine coalbed is divided into a plurality of coalbed methane coal gas mining areas along the coal seam slope and the mining boundary line (This application document is hereinafter referred to as the mining area); each wing of each mining area has a mining area ventilation gas injection coal lane along the inclined center of the coal seam, and its two ends are connected to the central ventilation coal lane and the boundary ventilation coal lane. The production process of coalbed methane and coal gas is monitored in the roadway; in the mining area ventilation gas injection coal roadway, there are coalbed methane extraction pipelines, coalbed methane gas injection pipelines, gasification agent oxygen pipelines, gasification agent water vapor pipelines, Compressed air pipelines, carbon dioxide pipelines, water pipelines and power cables constitute the pipeline combination in the mining area; gasification agent water vapor pipelines enter the mine gas rock roadway through the rock hole, and are laid along the mine gas rock roadway and gas shaft; each wing of the mining area The ventilation and gas injection coal roadway in the mining area and the coal seam of the working face between each boundary line on both sides constitute a coalbed methane recovery working face (hereinafter referred to as the working face in this application), and there are multiple working faces on the two wings of the mining area , when the working face of one wing is producing gas, the working face of the other wing will be constructed; the coalbed methane extraction pipeline will lead to the ground along the central ventilation coal lane and the central ventilation shaft, and will be connected to the coalbed methane extraction vacuum pump and the coalbed methane user pipeline in turn; The coalbed methane gas injection pipeline parallel to the coalbed methane extraction pipeline in the underground is connected to the user's coalbed methane pipeline network on the ground; both sides of the ventilation and gas injection coalway in the mining area are connected to multiple coalbeds in the drilling site; each coalbed in the drilling site is connected to the local The coalbed methane extraction coal hole in the coal seam of the working face, the coalbed methane extraction pipe inserted in the coal hole is connected to the coalbed methane extraction pipeline, and the gap between the pipe and the hole wall is filled with fillers to seal the coalbed methane extraction coal hole; There is an airtight wall in the coal roadway of each drilling site, and the airtight wall and the end of the coal roadway in the drilling site form an isobaric coal roadway; insert the coalbed methane gas injection pipe in the isobaric coal roadway to connect the coalbed methane gas injection pipeline; open the coalbed methane extraction pipe and The connection of the coalbed methane extraction pipeline, the coalbed methane in the coal seam of the working face on both sides of the ventilation and gas injection coal roadway in the mining area is sequentially pumped into the coalbed methane extraction coal hole, the coalbed methane extraction pipe, the coalbed methane extraction pipeline, the coalbed methane After the vacuum pump is extracted, it is discharged into the user's coalbed methane pipe network; at the same time, the connection between the coalbed methane gas injection pipe and the coalbed methane gas injection pipeline is opened, and the coalbed methane is injected into the isobaric coal roadway to increase or decrease the gas injection flow rate to make the airtight The air pressure in the coal lanes on both sides of the wall is kept constant, and the gas exchange is stopped. The coalbed methane coal gas mine as claimed in claim 1, the coalbed gas contained in the coalbed is first produced in the coalbed, and then the coalbed gas is produced in the coalbed. There is a working face gas coal roadway that is close to, parallel to, and equal in length to the ventilation and gas injection coal roadway in the mining area. A plurality of gasification coal lanes whose ends reach the mining boundary line, and each gasification coal lane is connected with multiple mine gasifier coal lanes or mine gasifier coal holes perpendicular to it, mine gasifier coal lanes or mine gasifier coal lanes The coal in the coal seams on both sides of the coal hole of the mine gasifier is gasified to produce gas, and the gas flows into the gasification coal roadway, the gas coal roadway at the working face, the gas upward rock roadway, the mine gas rock roadway, and the gas shaft. Full-section flow transportation to the ground pipeline; along the entire length of the gasification coal roadway, it is divided into multiple furnace groups; in each furnace group, the gas injection pipes in the adjacent multiple mine gasifier coal roadways or mine gasifier coal holes , connected to the same main gas injection pipe, the main gas injection pipe passes through the coal pillar along the gasification coal roadway, reaches the ventilation gas injection coal roadway in the mining area, and connects each pipeline in the pipeline combination of the mining area; the gasification coal roadway and the mines on both sides The gasification furnace and the main gas injection pipe constitute the gasification coal roadway combination; the furnace group at the end of the gasification coal roadway is the first mining, and each adjacent furnace group takes over in sequence to produce gas; at the opening of each gasification coal roadway, there is a monitoring pipe Pass through the coal pillars to reach the ventilation and gas injection coal lanes in the mining area. There are devices in the monitoring pipe for collecting gas samples and gas temperature, pressure and other parameters; It forms a ventilation system with the gas shaft; before the gasification coal lane is combined to produce gas, the gas coal lane on the working face is connected to the boundary ventilation coal lane, followed by sandbag explosion-proof airtight wall, explosion-proof airtight wall, carbon dioxide coal lane, and airtight wall , compressed air coal lane, closed wall, working face gas coal lane, and boundary ventilation coal lane are connected in sequence; the gas injection pipe inserted into the carbon dioxide coal lane and the gas injection pipe inserted into the compressed air coal lane inject carbon dioxide and compressed air into the coal lane respectively, and control The gas injection flow rate makes the air pressure in the compressed air coal lane and the carbon dioxide coal lane always equal to the air pressure in the gas coal lane of the working face. The above constitutes an equal-pressure explosion-proof and leak-proof airtight wall combination, which is used in each of the application documents. The connection between the ventilation roadway and the gas roadway and the coal hole between them; the entire circumference of the section of the mine gas rock roadway and the gas shaft, there is a heat-insulating refractory brick support ring; there is a steel plate support ring close to the refractory brick support ring; There is an electric furnace heating in the hole coalbed methane shaft; there is an upright metal gas burning cylinder in the mine gas rock roadway, and there are combustion pipes and electric furnaces in the cylinder. The gas is heated above its ignition point, the combustion tube injects oxygen and carbon dioxide into the combustion cylinder, the gas in the barrel ignites spontaneously, and the gas in the mine gas rock lane burns to form a torch to keep the temperature of the gas higher than the condensation point. The coalbed methane coal gas mine as claimed in claim 1, wherein the inner coal seam first produces the contained coal seam gas, and then produces coal gas in the coal seam, and is characterized in that: the coal gas coalway of the working face is connected to the test mine gasifier in the coal seam of the working face in sequence Horizontal coal roadway, vertical coal roadway of mine gasifier leading to the upper rock formation of coal seam; close to the end of mine gasifier horizontal coal roadway and the coal wall of the vertical coal roadway connected to it, with refractory brick wall; along the test mine gasifier There is a lower gas injection pipe along the entire length of the horizontal coal roadway of the gasifier; along the entire length of the horizontal coal roadway and the vertical coal roadway of the mine gasifier, there are upper gas injection pipes; the above two gas injection pipes pass through the coal pillar to reach the ventilation gas injection coal and connect the pipes in the pipeline combination in the mining area; the nozzle of the upper gas injection pipe is closed with a cover plate, and there are gas injection holes in the pipe wall below the cover plate; there is a wooden wall at the end of the horizontal coal roadway of the test mine gasifier, and the bottom of the wooden wall is There is an electric furnace, and the asbestos insulated cable connected to the electric furnace is connected to the ventilation and gas injection coal lane in the mining area; the electric furnace in the horizontal coal lane of the mine gasifier is turned on to heat the coal wall temperature of the coal lane to above the ignition point of coke; the gas injection pipe injects oxygen and water vapor, The coal on the wall of the coal lane of the Mulong and mine gasifiers is ignited with oxygen and spontaneously ignited, and the gas produced by the mine gasifier is tested. The gas enters the gas coal lane of the working face, the gas rock lane, the gas well shaft, and flows to the pipeline on the ground; In the mine gasifier coal lane, the gas flow inside and outside the gas injection pipe is opposite; the mine gasifier coal lane, gas injection pipe and ignition device constitute a coal lane mine gasifier with reverse gas injection electric furnace ignition; mine gasifier coal At the opening of the roadway, there is a monitoring pipe leading to the ventilation and gas injection coal roadway in the mining area; inside the monitoring pipe, there are gas sampling, gas temperature, and pressure monitoring devices; the coal in the coal seams on both sides of the mine gasifier coal roadway is continuously gasified and consumed, forming a continuous Expanded pear-shaped goaf; when gas quality declines, the gas injection pipe is first changed to water injection to generate a large amount of water vapor to replace the gas in the goaf, and then continuously inject carbon dioxide to keep the gas from entering the mining area. The coalbed methane coal gas mine as claimed in claims 1 and 4, wherein the inner coal seam produces the contained coal bed gas first, and then produces the coal gas in the coal seam, which is characterized in that: the end of the coal bed gasifier coal roadway in the test coal roadway, the two sides Each gasification coal hole has a vertical gasification coal hole, and each gasification coal hole has a gas injection branch pipe connected to a horizontal gas injection pipe. The nozzle of each gas injection branch pipe is the gas injection point; test the coal roadway wall After the temperature is heated by the electric furnace to reach the ignition point of coke, the water vapor and oxygen injected into the horizontal gas injection pipe, after exiting the nozzles of each gas injection branch pipe, flow along the gasification coal hole to the gasification coal roadway, wood wall and coal roadway wall The coal is spontaneously ignited by oxygen; the flame moves along the wall of the gasification coal hole, against the flow direction of oxygen, and moves to the nozzle of the gas injection branch pipe. The chemical reaction is carried out on the coal wall to produce gas. The coalbed methane coal gas mine as claimed in claim 1, wherein the inner coal seam produces the contained coal bed gas first, and then produces the coal gas in the coal seam, which is characterized in that: the coal gas coalway of the working face is connected to the test coal hole mine gasification in the coal seam of the working face The gasification coal hole of the furnace has a gas injection pipe along the entire length of the coal hole. The gas injection pipe passes through the coal pillar to reach the ventilation and gas injection coal lane of the mining area, and connects the pipelines in the mining area pipeline combination; there is asbestos in the gas injection pipe Insulated armored cable; there is a wooden block at the end of the coal hole, and in the spiral groove on the wooden block, there is an electric furnace electric system connected to the armored cable; the other end of the armored cable passes through the coal pillar to reach the mining area for ventilation and gas injection Coal lane, and connect the cables in it; turn on the electric furnace, heat the temperature of the coal on the gasification coal hole wall to above the ignition point of coke; inject water vapor into the gas injection pipe first, replace the gas in the gasification coal hole, and then inject oxygen Add water vapor, the coal on the wall of the gasification coal hole spontaneously ignites and ignites to produce gas; the gas flow flows into the gas coal lane, gas rock lane, and gas shaft of the working face to the ground; the gasification coal hole, gas injection pipe, and electric furnace form a reverse gas injection electric furnace ignition The coal hole mine gasifier; the test coal lane near the gasification coal hole is connected to the gas coal lane of the working face; the test coal lane is connected to the vicinity of the gasification coal hole by a plurality of test coal holes; there is a test coal lane along the test coal hole The test pipe passing through the coal pillar leading to the ventilation and gas injection coal roadway in the mining area has a device for collecting gas samples, monitoring the gas temperature and pressure, and transmitting them. The coalbed methane gas mine as claimed in claim 1, wherein the inner coal seam produces the contained coal bed gas first, and then produces the coal gas in the coal seam, which is characterized in that: a pair of central ventilation shafts pass through the coal seam, and connect a pair of along the bottom of the coal seam. The central ventilated rock alley with inclined coal seam; two boundary ventilated shafts pass through the coal seam and connect the border ventilated rock alley in the rock below the boundary line; the mine ventilation horizontal rock alley connects the bottom of the above four ventilated rock alleys to form independent Ventilation system; both ends of the ventilation and gas injection coal roadway in each mining area, and the downward rock roadway, connecting the boundary ventilation rock roadway and the central ventilation rock roadway; in the rock formation directly below the ventilation and gas injection coal roadway in each mining area, there are two ends respectively connected to the boundary Ventilated rock alley and central ventilated rock alley are ventilated horizontal rock alleys in the mining area; mining area ventilated horizontal rock alleys and mining area ventilated gas injection coal alleys are connected by multiple upward rock alleys to form two sets of ventilation systems on the working face. Work in the system; each wing of each mining area has a mining area gas shaft near the central ventilated rock roadway; the above-mentioned shafts, rock roadways, and coal rocks constitute a rock roadway type coalbed methane gas mine below the coal seam; the mining area In the coal seam of the two working faces on both sides of the ventilation and gas injection coal roadway, there are multiple coalbed methane extraction coal holes, and the coalbed methane in the coal seam of the working face is extracted. As claimed in claim 1 and 7, the coalbed methane coal gas mine, wherein the inner coal seam produces contained coal bed gas first, and then produces coal gas in the coal seam, it is characterized in that: the full length of each working face of each wing of the mining area along the direction of the coal seam, Divided into multiple gasification sections, one gasification section in each wing produces gas in turn; multiple gasification sections in each wing, from the center to the boundary of the mine field, successively produce gas; , divided into multiple gasification section working face gas coal lanes, adjacent gasification section working face gas coal lanes are separated by coal pillars; each gasification section working face directly below the gas coal lane, there is a parallel The gas rock roadway in the working face; the gas rock roadway in each working face is connected with the gasification section working face gas coal roadway with the gas horizontal rock roadway and the gas upward rock roadway, and there is a gas water gate in the gas horizontal rock roadway; the gas water gate in the gasification section working face The rock roadway connects the ventilated rock roadway in the mining area with the ventilated downward rock roadway and the ventilated horizontal rock roadway. There are ventilation water gates in the ventilated horizontal rock roadway; , connecting the gas shaft in the mining area; the coal gas rock roadway in the working face of the adjacent gasification section, when producing gas, connect the coal gas rock roadway in the working face of the first mining gasification section; the mine gasification of each gasification coal roadway in each gasification section The gas produced by the furnace flows through the gasification coal lane, the gas coal lane of the working face of the gasification section, the gas upward rock lane, the gas rock lane of the working face, the gas shaft of the working face to the surface pipeline; During production, the gas water gates connected to it are closed, and the gas is always filled with water in the upward rock tunnel, and the waste gasification section is closed; when the gasification section starts to produce gas, all the ventilation water gates are closed, and the downward ventilation is filled with water in the rock tunnel There are drainage rock holes in the gas rock roadway of the working face to connect the ventilated rock roadway in the mining area. The coalbed methane coal gas mine as claimed in claim 1, wherein the inner coal seam first produces the contained coalbed methane, and then produces coal gas in the coal seam, and is characterized in that: the coal gas well shaft of each mining area is connected to the air extractor on the ground; each wing of the mining area is gasified Before producing gas in the section, turn on the gas extractor to exhaust the gas system composed of the gas well shaft in the mining area, the gas rock roadway in the working face, the gas coal roadway in the working face of the gasification section, each gasification coal roadway and the gasifier coal roadway in each coal seam mine At the same time, the gas injection pipes of each coalbed gasifier in the gasification section inject carbon dioxide with the same total flow rate to replace the air; when the gasification section ends the gas production, the induced draft fan exhausts the remaining gas in the gas system , The gas injection pipes of each mine gasifier in the gasification section are injected with equal flow of carbon dioxide to replace the coal gas. Coal bed methane gas mine as claimed in claims 1 and 7, wherein the inner coal seam produces contained coal bed methane first, and then produces coal gas in the coal seam, it is characterized in that: 2 mining area gas shafts close to each other in each mining area, passing through After passing through the coal seam and the elevation of the central ventilated rock roadway, the bottom of the well is connected with the ventilated rock roadway to form a ventilated mine; the shaft of each mining area is connected at the elevation of the central rock roadway and the mining area ventilated rock roadway and the central ventilated rock roadway of the wing are constructed; At the elevation of the coal gas rock roadway in the working face of the first mining gasification section, connect and construct the gas rock roadway in the working face of the first gasification section of this wing; There is a water discharge pipe connected to the gas well shaft in the mining area; there is a sluice wall in the ventilated rock roadway; the gas shaft in the mining area on the side of the gas production wing is filled with water and sediment below the elevation of the gas rock roadway on the working face, and the water flow rate of the water discharge pipe is adjusted , to regulate the height of the water level. Coal bed methane gas mine as claimed in claims 1 and 7, wherein the inner coal seam produces contained coal bed gas first, and then produces coal gas in the coal seam, and is characterized in that: there are two mining area ventilation along the direction of the coal seam in the two wing coal seams of the mining area Gas-injection coal roadway, the coal roadway is connected with ventilation downward rock roadway, horizontal ventilation rock roadway, mining area ventilated rock roadway; the coal seam on both sides of ventilation gas injection coal roadway in each mining area is a working face; each working face and The gas injection coal roadway in the mining area is close to the gas coal roadway of the working face parallel and equal in length, and successively connects the gas downward rock roadway, the gas horizontal rock roadway, the gas rock roadway in the mining area directly above the ventilated rock roadway in the mining area, The gas well shaft in the mining area; there is a closed wall in each gas horizontal rock roadway, and the gas coal roadway of the scrapped working face is closed. The coalbed methane gas mine as claimed in claims 1 and 3, wherein the inner coal seam produces the contained coal bed gas first, and then produces the coal gas in the coal seam, which is characterized in that: the coal gas lane of the working face is located on the boundary of the mining area along the direction of the coal seam, and One end is connected to the mine gas rock roadway and the gas shaft; the ventilation gas injection coal roadway in the mining area, the coal seam of the working face, and the gas coal roadway of the working face are connected in sequence to form a coal seam type coal bed gas coal gas working face in the middle working face; The mining pipeline and CBM gas injection pipeline are respectively connected to the vacuum pump on the ground and the CBM user pipe network pipeline; the multiple coalbed methane extraction coal holes in the coal seam of the working face are respectively connected to the ventilation and gas injection coal lane in the mining area and the coal gas injection of the working face. Coal roadway; the gas coal roadway in the working face connects multiple gasification coal roadway combinations in the coal seam of the working face, and the end of each gasification coal roadway is close to the ventilation and gas injection coal roadway in the mining area; each main gas injection pipe in the gasification coal roadway is The end passes through the coal pillar to reach the ventilation and gas injection coal roadway in the mining area, and connects the pipelines in the pipeline combination in the mining area; the furnace group at the end of each gasification coal roadway is the first mining furnace group, and each adjacent furnace group takes over the production in sequence Coal gas; There is a party normally closed damper at the connection between the ventilation and gas injection coal lane of the mining area and the central ventilation coal lane; Air supply to the ventilation and gas injection coal lane in the mining area; adjust the air supply flow and air supply pressure to keep the air pressure in the ventilation and gas injection coal lane in the mining area constant equal to the air pressure at the end of the gasification coal lane.

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