A method for collaborative treatment of gas and coal spontaneous combustion in overlying fault of fully mechanized caving face
By implementing measures such as high-level drilling, pipe laying, sealing, and inert gas injection pipelines during fault crossings in fully mechanized longwall mining faces, the problem of coordinated management of gas and coal spontaneous combustion hazards during fault crossings in fully mechanized longwall mining faces was solved, achieving safe production and environmental improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-02-17
- Publication Date
- 2026-03-20
AI Technical Summary
Existing technologies lack a coordinated approach to managing gas and coal spontaneous combustion disasters in goaf areas during fault crossings in fully mechanized mining faces, resulting in complex causes and severe consequences of these disasters.
During the fault crossing of the fully mechanized longwall face, high-level boreholes, goaf-buried pipes, intake and return airway sealing, grouting pipelines, inert gas injection pipelines, and gas monitoring pipelines are deployed. Gas is extracted through high-level boreholes, air leakage is reduced by using sealing materials, grout and inert gas are injected, gas concentration is monitored, and corresponding measures are taken to coordinate the control of gas and coal spontaneous combustion.
Effectively prevent gas and coal spontaneous combustion coupling disasters during fault crossings in fully mechanized longwall mining faces, ensure safe mine production, improve the underground working environment, and avoid production interruptions.
Smart Images
Figure CN114635741B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of gas and coal self-ignition collaborative control, and discloses a method for collaborative control of gas and coal self-ignition in a fully-mechanized caving face passing through a fault. BACKGROUND
[0002] At present, there are many mine main coal seams goaf in China, and gas disaster and coal self-ignition disaster exist simultaneously. The coupling effect of the two disasters makes the disaster cause complex, and once the disaster occurs, the consequences are extremely serious. In order to effectively prevent and control the gas and coal coupling disaster, domestic and foreign scholars have carried out a lot of research. However, the existing research methods are mainly aimed at normal mining of fully-mechanized mining face, and no research on the control of goaf gas and coal self-ignition during the fully-mechanized mining face passing through the fault has been found.
[0003] When the fully-mechanized mining face passes through the fault, the mining advancing speed slows down, the air leakage increases, a large amount of residual coal is left, the oxidation zone of the goaf is exposed for a long time, and coal self-ignition is extremely easy to occur. In addition, due to the particularity of the fault structure, a large amount of gas may be present in the fault itself. Therefore, compared with normal mining, the goaf during the fully-mechanized mining face passing through the fault is more prone to gas and coal self-ignition coupling disasters. The present application proposes a method for collaborative control of gas and coal self-ignition in the goaf during the fully-mechanized mining face passing through the fault. The method has great economic value and very important social significance for preventing and controlling the gas and coal self-ignition coupling disasters during the fully-mechanized mining face passing through the fault, ensuring the safety of mine production, and improving the underground working environment. SUMMARY
[0004] Therefore, the purpose of the present application is to construct a collaborative control system for gas and coal self-ignition during the fully-mechanized mining face passing through the fault, and to solve the problem of lack of collaborative control of gas and coal self-ignition in the prior art.
[0005] To achieve the above purpose, the present application provides a method for collaborative control of gas and coal self-ignition in a fully-mechanized caving face passing through a fault, which specifically comprises the following steps:
[0006] S1: arranging high-position drill holes, goaf buried pipes, air inlet and return airway plugging, grouting pipelines, inert gas injection pipelines and gas monitoring pipelines;
[0007] S2: using the high-position drill holes and the goaf buried pipes to extract the gas gushing from the residual coal in the fault area, using a plugging material to plug the air inlet and return airways to reduce air leakage in the goaf, and using the grouting pipelines to inject slurry into the goaf;
[0008] S3: collecting gas through the gas monitoring pipelines to analyze the gas concentration in the upper corner, stopping work and evacuating workers when the gas concentration is greater than 1%, and increasing the gas extraction negative pressure when the gas concentration is less than 0.8% to resume production;
[0009] S4: collecting gas through the gas monitoring pipeline to analyze the CO concentration, when the CO concentration in the goaf fault coal area continuously increases and the CO concentration in the air corner is less than 24 ppm, nitrogen is injected into the goaf fault coal area through the inert injection pipeline; when the CO concentration in the goaf fault coal area continuously increases and the CO concentration in the air corner is greater than 24 ppm, under the condition that the gas concentration is less than 0.8%, liquid CO2 is injected through the high-pressure borehole and the inert injection pipeline; when the CO concentration in the goaf fault coal area continuously increases and C2H4 gas appears, the workers are evacuated and a closed wall is built at a suitable position to close the working face.
[0010] In particular, step S1 specifically comprises: constructing a high-position drilling site near the fault, constructing a high-position borehole from the high-position drilling site, embedding an extraction pipeline to the goaf through a pre-buried manner in the air return roadway, blocking in the air inlet and return roadways using blocking materials, embedding a grouting pipeline and a gas monitoring pipeline in the goaf of the air return roadway, constructing an inert injection pipeline in the air inlet roadway, and constructing an inert injection pipeline and a gas monitoring pipeline in the inter-rack fault coal area.
[0011] In particular, the gas monitoring pipeline is a 25mm-diameter high-pressure hose with a bundle tube inside; the gas monitoring pipeline is arranged as follows: two pipelines are embedded in the goaf on the air return roadway side, with a step interval of 20m, and one pipeline is embedded between every four racks in the working face, embedded in the fault coal area, and connected as the working face mining progresses.
[0012] In particular, the inert injection pipeline arranged in the machine lane is a 2-4 inch steel pipe, which forms two pipelines in the goaf, with a step interval of 20m; the inert injection pipeline arranged in the working face inter-rack is a 25mm high-pressure hose, with one pipeline embedded between every four racks, embedded in the fault coal area, and connected as the working face mining progresses.
[0013] In particular, the final hole position of the high-position borehole is in the fault coal area, and the distance between the final hole positions is 10m; the high-position borehole is a long borehole with a diameter of 100-120mm; after the borehole enters the goaf, it is located in the fracture zone; after the borehole construction is completed, a whole protective hole screen pipe is used; the high-position borehole and the goaf embedded pipeline are used to extract the gushing gas from the fault area; the extraction parameters are set according to the gushing gas in the upper corner of the goaf; the borehole orifice negative pressure of the high-position borehole is not less than 13KPa.
[0014] In particular, the goaf embedded pipeline is arranged in an alternating step manner, with an alternating distance of 15m-20m.
[0015] In particular, the air inlet corner of the air inlet roadway and the air return corner of the air return roadway are blocked using blocking materials to reduce the air leakage in the goaf; an isolation pier is constructed every 10m in the air inlet roadway and the air return roadway according to the requirements; the isolation pier is constructed using bagged crushed gangue, adding quick laying materials in proportion and mixing with water for laying.
[0016] In particular, the slurry is injected into the goaf through a grouting pipe in the return airway; the grouting pipe is a steel pipe with a diameter of 2-4 inches, and two pipes are formed in the goaf, with a spacing of 20m.
[0017] The present application has the following technical effects:
[0018] During the period of passing through the fault, the goaf buried pipe is arranged on the return airway side, and the high-position borehole is arranged in the fault area for gas extraction; the air leakage plugging system is formed by plugging the entry and return airways of the working face, the grouting pipe is arranged on the return airway side, the inert gas injection pipe is arranged in the fault area of the machine lane and the working face frame, and the gas monitoring pipe is arranged in the upper corner of the working face, the goaf and the frame; the gas is collected from the gas monitoring pipe for analysis, and according to the analysis result, measures such as extraction, nitrogen injection, grouting and liquid CO2 injection are taken to cooperatively control the gas and coal spontaneous combustion disasters in the fully mechanized caving face passing through the fault, which can ensure the safety production of the mining face without affecting the normal production of the coal mine.
[0019] Other advantages, objects, and features of the present application will be in part apparent and in part pointed out below in the specification, and will be learned from a reading of the following specification and by practice of the application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is an overall schematic diagram of the present application.
[0021] 1-air lane; 2-grouting pipe; 3-gas monitoring pipe in the goaf on the return airway side; 4-plugging material; 5-goaf; 6-fault; 7-gas monitoring pipe between the working face frames; 8-nitrogen injection pipe; 9-high-position borehole; 10-high-position drilling field; 11-machine lane; 12-goaf buried pipe. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0023] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application will be further described below in combination with specific embodiments.
[0024] As shown in the drawings, Figure 1 The method for cooperatively controlling gas and coal spontaneous combustion in a fully mechanized caving face passing through a fault according to the present application specifically comprises the following steps:
[0025] S1. Arranging high-position boreholes, goaf buried pipes, air return roadway plugging, grouting pipes, inert gas injection pipes and gas monitoring pipes.
[0026] A high-position drilling field 10 is constructed near the roadway 11, high-position boreholes 9 are constructed from the high-position drilling field, a gas extraction pipe 12 is buried in the goaf 5 in the air return roadway 1 by a pre-buried mode, a plugging material 4 is used to plug in the air return roadway, a grouting pipe 2 and a gas monitoring pipe 3 are buried in the goaf in the air return roadway 1, an inert gas injection pipe 8 is constructed in the air inlet roadway, and an inert gas injection pipe 8 and a gas monitoring pipe 7 are constructed in the inter-rack fault coal area.
[0027] The gas monitoring pipe is a 25mm-diameter high-pressure hose with a bundle pipe. The gas monitoring pipe is arranged as follows: two pipes are buried in the goaf on the air return roadway side, with a step interval of 20m, and one pipe is buried between every four racks in the working face, in the fault coal area, and is extended with the working face mining.
[0028] The inert gas injection pipe arranged in the machine roadway is a 2-4-inch-diameter steel pipe, which forms two pipes in the goaf, with a step interval of 20m; the inert gas injection pipe arranged in the working face inter-rack is a 25mm-diameter high-pressure hose, with one pipe buried between every four racks, in the fault coal area, and is extended with the working face mining.
[0029] S2. Using high-position boreholes and goaf buried pipes to extract the gas gushing from the fault area coal, using a plugging material to plug the air inlet and return roadways to reduce the goaf air leakage, and using a grouting pipe to inject slurry into the goaf.
[0030] The terminal hole position of the high-position borehole 9 is in the fault coal area, with a distance of 10m, the high-position borehole is a long borehole with a diameter of 100-120mm, after entering the goaf, the borehole is located in the fissure zone, and a protective hole screen pipe is arranged in the whole borehole after the borehole construction is completed; the high-position borehole 9 and the goaf buried pipe 12 are used to extract the gas gushing from the fault area coal, the extraction parameters are set according to the gas gushing condition in the upper corner of the goaf, and the borehole opening negative pressure of the high-position borehole is not less than 13KPa. The goaf buried pipe mode is an alternating step, with an alternating distance of 15m-20m.
[0031] The air inlet and return corners of the air inlet roadway 11 and the air return roadway 1 are plugged by using a plugging material 4 to reduce the goaf air leakage, and a partitioned pile is constructed every 10m according to the requirements, the partitioned pile is made of bagged crushed gangue, with a proportion of quick laying material added and mixed with water for laying.
[0032] The grouting pipe 2 in the air return roadway 1 is used to inject slurry into the goaf. The grouting pipe 2 is a 2-4-inch-diameter steel pipe, which forms two pipes in the goaf, with a step interval of 20m.
[0033] S3. Collecting gas to analyze the upper corner gas concentration through the gas monitoring pipeline 3, when the gas concentration is more than 1%, stopping the operation, evacuating the staff, increasing the gas extraction negative pressure, and when the gas concentration is less than 0.8%, resuming production.
[0034] S4. Collecting gas to analyze the CO concentration through the gas monitoring pipeline, when the CO concentration in the goaf fault coal area continuously increases and the return air corner CO is less than 24 ppm, injecting nitrogen into the goaf fault coal area through the inert injection pipeline; when the CO concentration in the goaf fault coal area continuously increases and the return air corner CO is more than 24 ppm, injecting liquid CO2 through the high-pressure borehole and the inert injection pipeline under the condition that the gas concentration is less than 0.8%; when the CO concentration in the goaf fault coal area continuously increases and C2H4 gas appears, evacuating the staff and building a closed wall to close the working face at a suitable position.
[0035] The method is suitable for the cooperative control of the goaf gas and coal spontaneous combustion disasters in the process of passing through the fault of the fully-mechanized caving face with the tendency of spontaneous combustion and large gas emission. During the passing through the fault, the goaf buried pipe is arranged on the return air roadway side, the high-position borehole is arranged in the fault area for gas extraction; the plugging air system is formed by plugging the entry and return air roadways of the working face, the grouting pipeline is arranged on the return air roadway side, and the inert gas injection pipeline is arranged in the fault coal area between the machine roadway and the working face frame; the gas monitoring pipeline is arranged in the upper corner of the working face, the goaf and the frame, the gas is collected and analyzed from the gas monitoring pipeline, according to the analysis result, the measures such as extraction, nitrogen injection, grouting and liquid CO2 injection are taken, and the goaf gas and coal spontaneous combustion disasters in the process of passing through the fault of the fully-mechanized caving face are cooperatively controlled. The method for cooperatively controlling the goaf gas and coal spontaneous combustion in the process of passing through the fault of the fully-mechanized caving face is scientific and reasonable, does not affect the production, and can ensure the safe mining of the working face.
[0036] The above-mentioned is only an embodiment of the present application, and the well-known specific structures and characteristics in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, and these will not affect the effect and practicability of the present application.
Claims
1. A method for the coordinated control of cross-fault gas and spontaneous combustion of coal in a fully mechanized longwall mining face, characterized in that, Includes the following steps: S1: Arrange high-level boreholes, buried pipes in goaf areas, sealing of intake and return airways, grouting pipelines, inert gas injection pipelines, and gas monitoring pipelines; S2: High-level drilling and buried pipes in the goaf are used to extract gas from residual coal in the fault area. Sealing materials are used to seal the intake and return airways to reduce air leakage in the goaf. Grouting pipes are used to inject grout into the goaf. S3: Collect and analyze the gas concentration in the upper corner through the gas monitoring pipeline. If the gas concentration exceeds 1%, stop the operation, evacuate the staff, increase the negative pressure of gas extraction, and resume production when the gas concentration is less than 0.8%. S4: Collect and analyze CO concentration through gas monitoring pipelines. When the CO concentration in the goaf fault coal remnant area continues to increase and the CO concentration in the return air corner is less than 24 ppm, inject nitrogen into the goaf fault coal remnant area using inert gas injection pipelines. When the CO concentration in the goaf fault coal remnant area continues to increase and the CO concentration in the return air corner is greater than 24 ppm, inject liquid CO2 using high-pressure drilling and inert gas injection pipelines, provided that the gas concentration is less than 0.8%. When the CO concentration in the goaf fault coal remnant area continues to increase and C2H4 gas appears, evacuate the workers and construct a sealing wall at a suitable location to seal the working face. Step S1 specifically includes: constructing a high-level drilling site in the roadway near the fault, drilling high-level boreholes from the high-level drilling site, burying extraction pipelines into the goaf area in the return airway through pre-embedding, sealing the goaf area in the intake and return airways with sealing materials, burying grouting pipelines and gas monitoring pipelines in the goaf area of the return airway, constructing inert injection pipelines in the intake airway, and constructing inert injection pipelines and gas monitoring pipelines in the coal remnant area of the fault between supports. The gas monitoring pipeline is a 25mm diameter high-pressure hose with a bundled tube inside; the gas monitoring pipeline is arranged as follows: two pipelines are buried in the goaf area on the side of the return air roadway, with a step spacing of 20m, and one pipeline is buried between every 4 frames of the working face, buried in the fault residual coal area, and extended as the working face is mined.
2. The collaborative governance method according to claim 1, characterized in that, The inert injection pipelines arranged in the machine roadway are steel pipes with a diameter of 2-4 inches, forming two pipelines in the goaf area, with a pipeline interval of 20m steps; the inert injection pipelines arranged between the working face frames are 25mm high-pressure hoses, with one line buried between every 4 frames, buried in the fault residual coal area, and extended as the working face is mined.
3. The collaborative governance method according to claim 1, characterized in that, The final borehole location of the high-level borehole is in the fault-affected coal seam area, with a distance of 10m between the final borehole locations. The high-level borehole is a long borehole with a diameter of 100-120mm. After entering the goaf, the borehole is located in the fracture zone. After the borehole construction is completed, a protective screen pipe is installed throughout the entire process. Gas emanating from the fault-affected coal seam is extracted using the high-level borehole and the buried pipe in the goaf. The extraction parameters are set according to the gas emission situation in the upper corner of the goaf. The negative pressure at the borehole opening of the high-level borehole is not less than 13KPa.
4. The collaborative governance method according to claim 1 or 3, characterized in that, The method of burying pipes in the goaf is to alternate steps, with an alternating distance of 15m-20m.
5. The collaborative governance method according to claim 1, characterized in that, In the intake and return airways, sealing materials are used to seal the corners of the intake and return airways to reduce air leakage in the goaf. An isolation stack is constructed every 10m in the intake and return airways as required. The isolation stack is constructed by mixing bagged crushed gangue with quick-laying material and water.
6. The collaborative governance method according to claim 1, characterized in that, Grout is injected into the goaf using the grouting pipe in the return airway; the grouting pipe is a steel pipe with a diameter of 2-4 inches, forming two pipelines in the goaf, with the pipelines spaced 20m apart.