CN108952719B - Method for coal loss in coal seam gasification re-mining under fully mechanized caving mining condition - Google Patents
Method for coal loss in coal seam gasification re-mining under fully mechanized caving mining condition Download PDFInfo
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- CN108952719B CN108952719B CN201810745237.0A CN201810745237A CN108952719B CN 108952719 B CN108952719 B CN 108952719B CN 201810745237 A CN201810745237 A CN 201810745237A CN 108952719 B CN108952719 B CN 108952719B
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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
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
Abstract
The invention discloses a method for coal seam gasification re-mining lost coal under the condition of fully mechanized caving mining, which comprises the following steps: step 1, designing a working surface and defining the position of a partition wall; step 2, in the fully mechanized caving face extraction process, draining and draining the working face, embedding explosives in the coal pillars within the range of the designed isolation wall, backfilling the laneway of the working face and laying related pipelines at the same time; step 3, performing fireproof sealing on a track roadway and a transportation roadway of a working face of the mining area, and arranging a partition wall; connecting an external pipeline and a fan with a mining area re-mining system; and 4, igniting and recovering.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a method for losing coal under the condition of coal bed gasification combined mining and fully mechanized caving mining.
Background
In recent years, the development and utilization efficiency of coal resources is higher and higher, and the limitation of resources and the unlimited demand of resources require that the recovery rate of coal resources is improved as much as possible. Lost coal caused by mining technology and mining technology forms stagnant reserves in a plurality of old mines and coal mines with poor mining conditions, the reserves of the coal have considerable economic effect, and the re-mining has important significance for the sustainable development of mines and the improvement of the economic benefit of the mines.
The fully-mechanized top coal caving mining technology is widely applied to the coal industry in China, has the advantages of high unit yield, high efficiency, low cost, small roadway excavation amount, few moving times, strong adaptability to coal seam thickness variation and geological structure and the like, and has the defects of high coal loss, easy ignition, large coal dust and easy accumulation of gas. The resource recovery rate of the fully mechanized top coal caving mining is generally 65-85%, the recovery rate of a few can reach 90%, and therefore, a large amount of coal resources are lost in a goaf, and huge resource waste is caused. Therefore, the re-mining of the existing fully-mechanized top coal caving has important practical significance for prolonging the production period of a mine, improving the recovery rate of resources, improving the economic efficiency and the like.
At present, the research on the residual coal of the fully mechanized top coal caving is less, and CN201410029095 discloses a method for fully mechanized top coal caving and re-mining residual bottom coal, which mainly comprises the steps of tunneling an upper roadway and a lower roadway of a re-mining working face along the width of 1-2 roadways outside a residual bottom coal bottom plate, reasonably setting sections to protect coal pillars, cutting holes, reinforcing a top plate, controlling a coal bed, and performing fully mechanized top coal caving and re-mining on the residual bottom coal; CN201710687657 discloses a method for re-mining a coal pillar of a stoping line of an extra-thick coal seam, which is to dig a tunnel along the advancing direction of a coal pillar re-mining working face at the upper part of the extra-thick coal seam, fill the tunnel beside the tunnel, dig a coal pillar re-mining working face stoping tunnel and an auxiliary inclined tunnel to form a complete production system, and arrange the coal pillar re-mining working face.
The existing fully-mechanized top coal caving and residual coal re-mining method mainly adopts secondary mining of residual coal pillars, corner coal or bottom coal with larger thickness, and the re-mining method also mainly adopts a special coal mining method by rearranging a working face. For the re-mining of the fully mechanized top coal caving residual coal, because of the technical problems, no report of the related re-mining method can be obtained in the prior published documents.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a method for coal seam gasification re-mining lost coal under the fully mechanized caving mining condition, so as to solve the problems in the background technology.
The technical scheme adopted by the invention is as follows,
the method for coal layer gasification re-mining lost coal under the fully mechanized caving mining condition is suitable for the condition that a re-mining system is not designed in advance and re-mining facilities are laid, but a working face roadway and a separation wall cannot be arranged in a superposition manner on the working face which is mined by the fully mechanized caving method; the method comprises the following steps of (a) carrying out,
step 1, after the fully mechanized mining face is mined, dividing the position of a partition wall on the periphery of the face by combining original geological data, technical data and production data of a mining area;
step 3, tunneling an upper layered roadway according to the defined position of the partition wall, and filling the upper layered roadway with filling bodies to form an upper layered partition wall;
and 5, igniting and re-mining, feeding back to the control system according to the monitoring data of the sensor, and timely adjusting parameters such as temperature, air steam content, oxygen concentration, air pressure and the like by the control system to ensure that the coal bed gasification is normally carried out.
The invention also provides another method for coal seam gasification re-mining lost coal under the fully mechanized caving mining condition, which is suitable for the conditions that the coal seam is thick and re-mining facilities such as a re-mining air inlet pipe, an air return pipe, a drain pipe, explosives, a sensor and the like are arranged in advance during fully mechanized caving mining; the method comprises the following steps:
step 1, combining geological data and technical data of a mining area, designing a fully mechanized caving face, and marking the position of a partition wall;
3, in the process of fully mechanized caving face mining, along with the advance of the face, distributing an air supply pipe, an air return pipe, a drain pipe and a sensor at the edge of a roadway, and embedding explosives by using drill holes for part of coal pillars with the width larger than or equal to 30 m; the roadway at the left and right boundaries of the re-mining area is pushed along with the working face to delay filling the roadway to form a lower layered partition wall;
and 6, igniting and re-mining, feeding back to the control system according to the monitoring data of the sensor, and timely adjusting parameters such as temperature, air steam content, oxygen concentration, air pressure and the like by the control system to ensure that the coal bed gasification is normally carried out.
Further, in the two technical solutions, the relevant parameters in step 4 include temperature, air water vapor content, oxygen concentration, and air pressure.
Furthermore, in the two technical schemes, the lower layered partition wall is tunneled in a bottom-lying mode, and the upper layered partition wall is tunneled in a top-raising mode, so that the coal body on the outer side of the partition wall is not contacted with the residual coal on the working face.
Furthermore, in the two above technical solutions, the filling body of the partition wall may be made of a material having a certain supporting strength and flame retardant property, such as a concrete material, a high water material, and the like.
Further, in the two technical schemes, the explosive utilizes the energy generated by explosive explosion to loosen and crack the gasified coal bed, so as to create the condition of seepage combustion.
Compared with the prior art, the invention has the beneficial effects that:
the technology can improve the utilization rate of coal resources and the economic benefit of coal production, and is a new economic growth point of the coal industry; the underground coal gasification technology can reduce the pollution to the environment in the coal resource utilization process, is a green mining technology which accords with the sustainable development strategy, improves the working efficiency and is suitable for large-scale popularization.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a sectional view of a longitudinal structure in example 1 of the present invention;
FIG. 2 is a schematic view of a lateral structure in example 1 of the present invention;
FIG. 3 is a sectional view of a longitudinal structure in example 2 of the present invention;
FIG. 4 is a schematic view of the lateral structure in example 2 of the present invention;
FIG. 5 is a schematic diagram of the structure of combustible gas generated in the underground coal gasification process of the present invention;
in the figure: 1. the coal body, 2, the partition wall, 21, the upper layered partition wall, 22, the lower layered partition wall 23, the staggered filling partition wall, 31, the lower layered roadway 32, the upper layered roadway 4, the air inlet pipe, 5, the working face residual coal, 6, the roadway upper coal body, 7, the coal pillar, 8, the working face roadway, 9, the return air pipe, 10, the explosive, 11, the drain pipe, 12, the combustion zone, 13, the residue after gasification, 14, the mining area gas collecting pipe, 15, the air supply pump, 16, the mining area air supply pipe, 17, the mining area collecting and draining pipe, 18, the drain pump, 19, the air collecting pump, 20, the sensor, 201, the temperature sensor, 202, the humidity sensor, 203, the oxygen concentration sensor, 204, the air pressure sensor, 21, and the open-cut hole.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
the invention relates to underground coal gasification, which is a process for directly obtaining combustible gas at a coal seam occurrence place, namely solid minerals are changed into gaseous fuel through a thermochemical process underground, and then the gaseous fuel is discharged to the ground through a drill hole and supplied to users. Underground coal gasification is a chemical coal mining method in which high molecular coal mainly containing carbon elements is combusted underground to be converted into low molecular fuel gas which is directly conveyed to the ground. The generation of combustible gas in the underground coal gasification process is realized in three reaction zones in a gasification channel, namely an oxidation zone, a reduction zone and a dry distillation drying zone, as shown in figure 5.
After passing through the three reaction zones, the combustible gas components mainly comprising CO and CH are formed4、H2The coal gas of (1). Underground coal gas is clean energy and chemical raw material, can be used for generating power, industrial combustion, reducing gas for urban civil and metallurgical industry, and can also be used for synthesizing gasoline and the like; the lost coal is repeatedly mined by utilizing the principle, namely, the lost coal 5 and the coal pillars 7 on the working face in the drawing are mined, and the specific combustion area is shown as the combustion area 12 in the drawing; FIGS. 1 and 3 show the combustion from left to right in sequence; the gray part of the figure shows the collected residue 13 after gasification, and the rest is the remaining coal 5 of the working face without collection.
Example 1
As shown in fig. 1 and fig. 2, the method is suitable for the condition that the roadway and the partition wall of the working face cannot be arranged in a superposed manner when the working face is mined by a fully mechanized caving method without designing a re-mining system and laying a re-mining facility in advance. The method comprises the following steps:
step 1, after the fully mechanized mining face is mined, dividing the position of a partition wall on the periphery of the face by combining original geological data, technical data and production data of a mining area;
step 3, tunneling an upper layered roadway according to the defined position of the partition wall, and filling the upper layered roadway with filling bodies to form an upper layered partition wall;
and 5, igniting and re-mining, feeding back to the control system according to the monitoring data of the sensor, and timely adjusting parameters such as temperature, air steam content, oxygen concentration, air pressure and the like by the control system to ensure that the coal bed gasification is normally carried out.
After the fully mechanized caving face is mined, a roadway is excavated on the periphery of the mining area face by combining geological data, technical data and production data, and then the roadway is filled by grouting to form the partition wall 2 shown in figure 2.
The fully-mechanized coal mining body is thick, and can be used for excavating a roadway layer by layer according to the actual situation, firstly excavating a layered roadway 31 and filling the layered roadway 31 to form a lower layered partition wall 22; and then, an upper layered roadway 32 is excavated and filled, so that the upper layered partition wall 21 is formed.
When the width of the coal pillar 7 exceeds 30m during the excavation of the roadway, in order to improve the gasification effect, the roadway excavated before can be filled by the partition wall 2, and the explosive 10 is buried in the drilled hole by drilling. When the partition wall is tunneled and constructed, large-diameter drilling is conducted on the goaf, the air inlet pipe 4, the air return pipe 9, the water discharge pipe 11, the sensor 20 and other devices are arranged, abandoned roadways of the mined working face are preferentially adopted, and the drilling engineering quantity is reduced.
And draining water accumulated in the gob in time after the drainage pipe 11 is arranged.
The lower layered partition wall 22 is tunneled in a bottom-lying mode, and the upper layered partition wall 21 is tunneled in a top-raising mode, so that the coal body 1 outside the partition wall is not contacted with the residual coal 5 on the working face.
And (4) igniting, namely adjusting indexes such as the concentration, the steam content, the temperature, the air pressure and the like of oxygen in the air inlet pipeline in due time according to the detection data to start coal bed gasification.
The partition wall 2 is composed of an upper layered partition wall 21 and a lower layered partition wall 22.
Example 2
As shown in fig. 3 and 4, the method is suitable for the conditions of a complex mining facility such as a complex mining air inlet pipe 4, an air return pipe 9, a water drain pipe 11, explosives 10 and a sensor 20 which are arranged in advance during the fully mechanized caving mining when the coal seam is thick. The method comprises the following steps:
step 1, combining geological data and technical data of a mining area, designing a fully mechanized caving face, and marking the position of a partition wall;
3, in the process of fully mechanized caving face mining, along with the advance of the face, distributing an air supply pipe, an air return pipe, a drain pipe, a sensor and the like at the edge of a roadway, and embedding explosives into a part of coal pillars with the width of more than or equal to 30m by utilizing drill holes; the roadway at the left and right boundaries of the re-mining area is pushed along with the working face to delay filling the roadway to form a lower layered partition wall;
and 6, igniting and re-mining, feeding back to the control system according to the monitoring data of the sensor, and timely adjusting parameters such as temperature, air steam content, oxygen concentration, air pressure and the like by the control system to ensure that the coal bed gasification is normally carried out.
According to original geological data, technical data and production data of a mining area, a re-mining design is combined with a mining design, a boundary roadway of a working face and the partition wall 2 are arranged in a superposition mode, and then the roadway is filled with grouting to form the partition wall 2 shown in the figure 4.
The boundary working face roadway in the stoping area is filled in the stoping process of the working face and then used as a lower layered partition wall 22, water is drained in time to drain the water accumulated on the working face in the stoping process of the fully mechanized caving face, and when the width of the coal pillar 7 exceeds 30m, the explosive 10 is buried in the roadway 8 by drilling for improving the gasification effect. An air inlet pipe 4, an air return pipe 9, a drain pipe 11 and a sensor 20 are paved in the roadway 8 by being pushed along with the fully mechanized caving face.
After the mining of the fully mechanized caving face is finished, the upper layered roadway 32 is tunneled on the upper portion of the lower layered partition wall 22, and as the inner side of the upper layered roadway 32 is close to a goaf, the roadway is tunneled by 0.5-0.8 roadway width by mistake to ensure the safety of avoiding rock caving, and the upper layered roadway 32 is filled to form the staggered filling partition wall 23.
And (4) performing fire-proof sealing on the fully mechanized coal mining face roadway 8.
The lower layered isolation wall 22 is tunneled in a bottom-lying mode, and the staggered filling isolation wall 23 is tunneled in a top-raising mode, so that the coal body 1 outside the isolation wall is not contacted with the residual coal 5 on the working face.
And (4) igniting, namely adjusting indexes such as the concentration, the steam content, the temperature, the air pressure and the like of oxygen in the air inlet pipeline in due time according to the detection data to start coal bed gasification.
The partition wall 2 is composed of a lower layered partition wall 22 and a staggered filling partition wall 23.
In the two embodiments above, wherein:
an air inlet pipe 4, an air supply pump 15 and a mining area air supply pipe 16 which are led out after the partition wall 2 is filled are sequentially connected from inside to outside; the return air pipe 9, the gas collection pump 19 and the gas collection pipe 14 of the mining area are sequentially connected from inside to outside; the drain pipe 11, the drainage pump 18 and the mining area collecting and draining pipe are sequentially connected from inside to outside; various sensors 20 monitoring the combustion parameters can be laid simultaneously with the return air duct 9 or the inlet air duct 4 or the drain duct 11.
The filling material of the isolation wall 2 has certain supporting strength and flame retardant property, such as concrete, high-water filling body and the like;
the buried explosive 10 has ignition leads, and the ignition leads are used for controlling explosion and breaking a coal bed.
The air inlet pipe 4, the air supply pump 15 and the mining area air supply pipe 16 are sequentially connected from inside to outside and are used for feeding required oxygen or oxygen and other combustion-supporting gas into the coal seam;
the drainage pipe 11, the drainage pump 18 and the mining area collecting and drainage pipe are sequentially connected from inside to outside and are used for draining accumulated water in the mining area;
the return air pipe 9, the gas collection pump 19 and the mining area gas collection pipe 14 are connected in sequence from inside to outside, and the function of the return air pipe is to enable CO and CH contained in the coal seam4、H2The combustible gas is collected.
The sensor 20 is composed of a temperature sensor 201, a humidity sensor 202, an oxygen concentration sensor 203 and an air pressure sensor 204, and is used for respectively monitoring the temperature, the air water vapor content, the oxygen concentration and the air pressure parameters in the re-mining area, and feeding the monitoring parameters back to the control system to timely adjust the parameters including the temperature, the air water vapor content, the oxygen concentration, the air pressure and the like so as to ensure that the coal bed gasification is normally carried out.
The sensor 20 is conditionally selected to be laid along with the air inlet pipe 4, the return air pipe 9 and the water outlet pipe 11.
The isolation wall 2 can be defined according to the actual geological conditions of the working face, and the fault boundary rock mass is preferentially used as the isolation wall 2, so that the grouting filling engineering amount is reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (5)
1. A method for coal seam gasification re-mining lost coal under the condition of fully mechanized caving mining is characterized by comprising the following steps:
step 1, combining geological data and technical data of a mining area, designing a fully mechanized caving face, and marking the position of a partition wall;
step 2, before the fully mechanized caving face is stoped, filling the cut holes of the working face by using a filling body to form a lower layered isolation wall;
3, in the fully mechanized caving face extraction process, along with the advance of the working face, distributing an air supply pipe, an air return pipe, a drain pipe and a sensor at the edge of the roadway; the roadway at the left and right boundaries of the re-mining area is pushed along with the working face to delay filling the roadway to form a lower layered partition wall;
step 4, after the fully mechanized caving face is completely mined, tunneling an upper layered roadway of the partition wall roadway, and filling the upper layered roadway with a filling body to form an upper layered partition wall;
step 5, performing fireproof sealing on the roadway of the working face of the mining area; connecting an external air supply pipe, an air return pipe, a drain pipe and a sensor with a mining area re-mining system;
and 6, igniting and re-mining, feeding back to the control system according to the monitoring data of the sensor, and timely adjusting related parameters by the control system to ensure normal coal bed gasification.
2. The method for coal seam gasification re-mining lost coal under the fully mechanized caving mining condition according to claim 1, wherein in step 2, drilling is utilized for a part of coal pillar with width larger than or equal to 30m, and explosives are buried in the drill hole.
3. The method for the coal seam gasification re-mining of the lost coal under the fully mechanized caving mining conditions as claimed in claim 1, wherein the relevant parameters comprise temperature, air-water vapor content, oxygen concentration and air pressure parameters.
4. The method for the coal seam gasification re-mining of the lost coal under the fully mechanized caving mining condition as claimed in claim 1, wherein the filling body of the partition wall is made of a material with certain supporting strength and flame retardant property.
5. The method for the coal seam gasification re-mining lost coal under the fully mechanized caving mining condition as claimed in claim 1, wherein the lower layered partition wall is tunneled in a bottom-lying mode, and the upper layered partition wall is tunneled in a top-raising mode, so that the coal body outside the partition wall is ensured not to be in contact with the residual coal on the working face.
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| CN110552677B (en) * | 2019-09-05 | 2024-03-15 | 中国矿业大学(北京) | Mine type coal underground gasification furnace and gasification method |
| CN111855902B (en) * | 2020-06-28 | 2021-05-14 | 北京科技大学 | Experimental device and method for simulating in-situ fluidized mining of deep metal ore |
| CN113982586B (en) * | 2021-10-27 | 2023-11-10 | 湖南柿竹园有色金属有限责任公司 | Extraction method for blasting extraction ore column by means of geometric dislocation draw groove and nonlinear directional control |
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| CN102287177A (en) * | 2011-08-19 | 2011-12-21 | 秦勇 | Method for gasifying underground coal |
| CN102418476A (en) * | 2011-10-24 | 2012-04-18 | 国鼎(大连)投资有限公司 | Deep coal and coal bed gas combined mining method |
| CN102900438B (en) * | 2012-10-12 | 2014-11-19 | 山西焦煤集团有限责任公司 | Residual coal full-mechanized repeated mining method of near-distance inflammable seam gob |
| CN103742149B (en) * | 2014-01-22 | 2015-10-28 | 太原理工大学 | A kind of combining puts the method that second mining remains ground coal |
| CN104963687B (en) * | 2015-07-09 | 2017-02-22 | 太原理工大学 | Method for recycling upper part residual coal and backfilling goaf by utilizing full-mechanized caving mining in extremely thick coal seam |
| CN106194147B (en) * | 2016-08-01 | 2018-11-02 | 中嵘能源科技集团有限公司 | The method of straight well horizontal well joint igniting in a kind of underground coal gasification(UCG) exploitation |
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| CN107339105B (en) * | 2017-08-11 | 2019-10-11 | 太原理工大学 | A method of stop adopting line coal column in the layering residual exploiting field of paste body filling second mining super high seam |
| CN107313778B (en) * | 2017-08-11 | 2019-07-26 | 太原理工大学 | A kind of second mining super high seam stops the method for adopting line coal column |
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