Method and system for building fireproof separation wall at air return corner of spontaneous combustion coal seam of deep high-ground-temperature mine
By building temporary grouting stations in deep high ground temperature mines and using rapidly forming bags to build fire-proof isolation walls, combined with BIM software and rule engine technical means, the problems of poor leakage air plugging and harsh operating environment in traditional construction methods are solved, and efficient and safe fire-proof isolation effects are achieved.
Patent Information
- Application Number
- CN202510375745.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2025-05-02
AI Technical Summary
The construction method of the traditional self-ignition coal seam return corner fireproof isolation wall in the deep high-ground mine has problems such as poor leakage plugging effect, waste of raw coal, harsh operating environment, and limited construction, making it difficult to effectively ensure the safety and production of the mine.
A temporary grouting station and fast-formable bag are used to build a fire-proof isolation wall, and the raw materials are filled through the slurry pipeline to form an isolation wall. The BIM software and rule engine are used to determine the appropriate ventilation surface and isolation wall construction location, and fire protection evaluation and simulation analysis are carried out.
It has achieved accurate sealing surface, strong stability and good fire resistance, reducing the risk of coal loss and the risk of spontaneous combustion of coal in goaf, improving safety benefits and operating environment safety, and reducing construction difficulty.
Smart Images
Figure CN119914345A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of mine fire prevention, and in particular, relates to a method and system for constructing a fireproof isolation wall at a return air corner of a spontaneous combustion coal seam in a deep high geothermal mine. Background Art
[0002] Coal is an important basic energy and raw material in my country, and it plays an important strategic role in the national economy. For the self-igniting coal seam fully mechanized caving working face in deep high-geothermal mines, in order to effectively control the oxidation and spontaneous combustion disaster of the residual coal in the goaf behind the working face, it is generally adopted to build a separation wall at a certain distance between the inlet and return air corners to block the air leakage in the goaf. The traditional isolation wall construction method is: at least 2 workers enter the return air corner, fill the woven bags with coal powder, and build the bag wall as a fireproof isolation wall. This method has four disadvantages: first, there are gaps between the bag walls, and due to the limitation of the working space, the blocked section is limited. After the production team support moves forward, the bag wall is easy to collapse, so the overall plugging effect is poor; second, the bag wall is made of raw coal from the working face, which not only causes the waste of raw coal, but also increases the coal left in the goaf, increasing the risk of spontaneous combustion; third, in mines with high temperature and heat damage, the return air corner temperature is generally above 30°C, high temperature and high humidity, and at the same time faces the risk of toxic and harmful gas outflow and low oxygen content, which is extremely detrimental to the physical and mental health of the workers; fourth, in mines with impact ground pressure disasters, the construction of the isolation wall is often restricted by closed limited personnel management and support conditions. Therefore, it is necessary to further optimize the construction method of the fire isolation wall of the return air corner of the self-igniting coal seam fully mechanized caving working face in deep high geothermal mines, and on the premise of ensuring that fire prevention measures are implemented in place, further improve the working environment of employees and improve the effectiveness of measures, so as to ensure the safety and green production of mines. Summary of the invention
[0003] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a method and system for building a fire-proof isolation wall in the return air corner of a self-igniting coal seam in a deep high geothermal mine, which can improve the economic benefits while ensuring the safety of the mine construction process, improve the fire protection performance, and effectively solve the problems existing in traditional construction methods.
[0004] In order to solve the above problems, the technical solution adopted by the present invention is as follows: A method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high-geothermal mine, comprising the following steps: (1) A temporary grouting station is built in the return air chute yard of the coal mining face, equipped with a loader and a large-flow grouting pump, and a slurry delivery pipeline is laid along the return air chute to the return air corner; (2) The temporary grouting station shall be equipped with at least three times the amount of filling materials; (3) Use quick-molding bags as the raw material for fireproof isolation walls. After the production of the previous shift of the isolation wall is completed, put the bags into the appropriate position in the return air corner of the working surface in advance and connect the pipe joints; (4) On the day of construction of the isolation wall, the filling material is continuously poured into the bag at the temporary grouting station until the bag is completely filled to form a fire isolation wall.
[0005] Furthermore, in step (3), the suitable position is a fully enclosed ventilation surface that blocks the return air corner; The bags are stacked to form the fireproof isolation wall.
[0006] Furthermore, the process of determining the ventilation surface of the return air corner is as follows: (3.1) Obtaining basic data of the return air corner, including the depth of the return air corner , shape, bending angle and length ; (3.2) Based on the pre-built rule engine, identify and mark the fire high-risk area of the return air corner, obtain the isolation parameters between the adjacent fire high-risk areas, build a fire isolation status assessment model, and generate the isolation status assessment coefficient based on the pre-processed isolation parameters , the isolation state evaluation coefficient Does not exceed the preset status threshold Send out early warning signals to the adjacent high-risk fire areas; (3.3) Establish the return air corner channel model based on BIM software, and in the return air corner channel model, predetermine the ventilation surface and establish the construction position of the fire isolation wall until the isolation status evaluation coefficient is Exceeding the status threshold until; (3.4) Use software simulation to simulate and analyze the fire isolation effect, and obtain the density of flames bursting out of the ventilation surface after a fire occurs during each simulation. H and duration T , combined with the isolation status evaluation coefficient , build a data calculation model to generate the fire protection assessment value of the return air corner ; (3.5) The fire assessment value generated Compared with the preset standard threshold Compare and if the fire rating value Below the standard threshold , then the predetermined ventilation surface meets the requirements of the appropriate position; otherwise it does not.
[0007] Furthermore, in step (3.2), the isolation status evaluation coefficient is calculated The formula is:
[0008] In the above formula, , , are the lengths of the return air corners ,depth And the bending angle The proportionality coefficient of .
[0009] Further, the fire protection assessment value is generated The formula is:
[0010] In the above formula, and The density means , mean duration The preset scaling factor of .
[0011] A fireproof isolation wall construction system for the return air corner of a self-igniting coal seam in a deep high-geothermal mine. The system includes a temporary grouting station built in the return air chute yard of a coal mining face, and a loader and a large-flow grouting pump equipped with the temporary grouting station. The grouting pipeline of the temporary grouting station is laid along the return air chute to the return air corner; The temporary grouting station is also equipped with at least three times of filling materials; At a suitable position in the return air corner, a fireproof isolation wall with a rapidly moldable bag as a base is constructed. The fireproof isolation wall is formed by pouring filling material into the bag on the day of construction of the isolation wall.
[0012] Furthermore, the suitable position is a fully enclosed ventilation surface that blocks the return air corner, and the bags are stacked to form the fireproof isolation wall.
[0013] Furthermore, the process of determining the ventilation surface of the return air corner is as follows: (1) Obtaining basic data of the return air corner, including the depth of the return air corner , shape, bending angle and length ; (2) Based on the pre-built rule engine, identify and mark the fire high-risk area of the return air corner, obtain the isolation parameters between the adjacent fire high-risk areas, build a fire isolation status assessment model, and generate the isolation status assessment coefficient based on the pre-processed isolation parameters , the isolation state evaluation coefficient Does not exceed the preset status threshold Send out early warning signals to the adjacent high-risk fire areas; (3) Establish the return air corner channel model based on BIM software, and in the return air corner channel model, predetermine the ventilation surface and establish the construction position of the fire isolation wall until the isolation status evaluation coefficient is Exceeding the status threshold until; (4) Use software simulation to simulate and analyze the fire isolation effect, and obtain the density of flames bursting out of the ventilation surface after a fire occurs during each simulation. H and duration T , combined with the isolation status evaluation coefficient , build a data calculation model to generate the fire protection assessment value of the return air corner ; (5) The generated fire assessment value Compared with the preset standard threshold Compare and if the fire rating value Below the standard threshold , then the predetermined ventilation surface meets the requirements of the appropriate position; otherwise it does not.
[0014] Furthermore, in step (3.2), the isolation status evaluation coefficient is calculated The formula is:
[0015] In the above formula, , , are the lengths of the return air corners ,depth And the bending angle The proportionality coefficient of .
[0016] Further, the fire protection assessment value is generated The formula is:
[0017] In the above formula, and The density means , mean duration The preset scaling factor of .
[0018] Compared with the prior art, the present invention has the following beneficial effects: The fireproof isolation wall constructed by this method and system has a precise sealing surface, strong stability, good fireproof performance, and tight top and side joints. In addition, it can reduce the phenomenon of coal loss on the working face, and while achieving economic benefits, it reduces the risk of spontaneous combustion of coal residue in the goaf and improves safety benefits. Due to the harsh working environment of the return air corner, this method can reduce the workload of manual construction and ensure the physical and mental health of the staff. For rock burst mines, during the construction period of the fireproof isolation wall, only a dedicated person is needed to be responsible for loading at the grouting station, eliminating the construction constraints caused by factors such as closed limited personnel management and support conditions, and effectively solving the problems existing in traditional construction methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the steps of the construction method described in the present invention. DETAILED DESCRIPTION
[0020] The present invention is further described below in conjunction with specific embodiments.
[0021] A mine owner in Shandong Province mined 3 (3 上 ) coal seam, with an average coal thickness of 7.03m, mainly fat coal and 1 / 3 coking coal, which is a Class II self-igniting coal seam, with the shortest natural combustion period of 64-68 days. The mine is a high-temperature heat-damaged mine, and the fully mechanized caving mining area is in the secondary high-temperature zone. The mine is a rock burst disaster mine, with a limit of 40 people in the coal mining face area, 16 people in the production shift in the mining impact area, and 40 people in the maintenance shift. During the production period of the production shift working face and within 30 minutes after the end of production, personnel are strictly prohibited from entering the air return chute. The 1304 fully mechanized caving working face in normal production is currently 420m long, with an ambient temperature of more than 32°C and a humidity of 100% at the return air corner. According to the fire protection design, a separation wall is constructed every 2 days at the return air corner of the working face (which can only be constructed in the morning maintenance shift) to block air leakage in the goaf and reduce the risk of oxidation and spontaneous combustion of coal in the goaf.
[0022] In view of the above situation, if Figure 1 As shown, the method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high geothermal mine according to the present invention comprises the following steps: (1) A temporary grouting station is built in the return air chute yard of the coal mining face, equipped with a loader and a large-flow grouting pump, and a slurry delivery pipeline is laid along the return air chute to the return air corner; (2) A temporary grouting station is provided with at least three times the amount of filling material. In this embodiment, the filling material is a high-water cementitious filling material; (3) Use quick-molding bags as the raw material for fireproof isolation walls. After the production of the previous shift of the isolation wall is completed, put the bags into the appropriate position in the return air corner of the working surface in advance and connect the pipe joints; Among them, the suitable position is the ventilation surface of the fully enclosed corner that blocks the return air; The bags are stacked to form a fireproof isolation wall.
[0023] Furthermore, the process of determining the ventilation surface of the return air corner is as follows: (3.1) Obtain basic data of the return air corner, including the depth of the return air corner , shape, bending angle and length ; (3.2) Based on the pre-built rule engine, identify and mark the fire high-risk areas in the return air corners, obtain the isolation parameters between adjacent fire high-risk areas, build a fire isolation status assessment model, and generate the isolation status assessment coefficient based on the pre-processed isolation parameters , the isolation status evaluation coefficient Does not exceed the preset status threshold Send out early warning signals to adjacent high-risk fire areas; Calculate the isolation status assessment coefficient The formula is:
[0024] In the above formula, , , are the lengths of the return air corners ,depth And the bending angle The proportionality coefficient of ; (3.3) Establish a return air corner channel model based on BIM software, and in the return air corner channel model, predetermine the ventilation surface and establish the location of the fire isolation wall until the isolation status assessment coefficient is Exceeding status threshold until; (3.4) Use software simulation to simulate and analyze the fire isolation effect, and obtain the density of flames bursting out of the ventilation surface after a fire occurs during each simulation. H and duration T , combined with the isolation status assessment coefficient , build a data calculation model to generate fire protection assessment values for return air corners ; Generate fire rating values The formula is:
[0025] In the above formula, and The density means , mean duration The preset scaling factor of ; (3.5) The generated fire assessment value Compared with the preset standard threshold Compare, if the fire assessment value Below standard threshold , then the predetermined ventilation surface meets the requirements of the appropriate position; otherwise it does not.
[0026] (4) On the day of construction of the isolation wall, the filling material is continuously poured into the bag at the temporary grouting station until the bag is completely filled to form a fire isolation wall.
[0027] The fireproof isolation wall constructed by the above method can be used for the construction of fireproof isolation walls at the air inlet corners of the self-igniting coal seam fully mechanized caving working face in deep high geothermal mines. For other types of mines such as shallow mining and no high-temperature heat damage, this method is also applicable if there are other factors that restrict the workers from entering the coal mining face to construct isolation walls at the air inlet and return corners.
[0028] The fireproof isolation wall construction system for the return air corner of the self-igniting coal seam in a deep high geothermal mine described in the present invention comprises a temporary grouting station built in the return air chute yard of the coal mining working face, and a loader and a large-flow grouting pump equipped with the temporary grouting station. The grouting pipeline of the temporary grouting station is laid along the return air chute to the return air corner; The temporary grouting station is also equipped with at least three times of filling materials; At a suitable position in the return air corner, a fireproof isolation wall with a rapidly moldable bag as the base is built. The fireproof isolation wall is formed by pouring filling materials into the bag on the day of the isolation wall construction.
[0029] The fireproof isolation wall constructed by this method and system has a precise sealing surface, strong stability, good fireproof performance, and tight top and side joints. In addition, it can reduce the phenomenon of coal loss on the working face, and while achieving economic benefits, it reduces the risk of spontaneous combustion of coal residue in the goaf and improves safety benefits. Due to the harsh working environment of the return air corner, this method can reduce the workload of manual construction and ensure the physical and mental health of the staff. For rock burst mines, during the construction period of the fireproof isolation wall, only a dedicated person is needed to be responsible for loading at the grouting station, eliminating the construction constraints caused by factors such as closed limited personnel management and support conditions, and effectively solving the problems existing in traditional construction methods.
Claims
1. A method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high-temperature mine, characterized in that: The following steps are involved: (1) A temporary grouting station is built in the return air chute yard of the coal mining face, equipped with a loader and a large-flow grouting pump, and a slurry delivery pipeline is laid along the return air chute to the return air corner; (2) The temporary grouting station shall be equipped with at least three times the amount of filling materials; (3) Use quick-molding bags as the raw material for fireproof isolation walls. After the production of the previous shift of the isolation wall is completed, put the bags into the appropriate position in the return air corner of the working surface in advance and connect the pipe joints; (4) On the day of construction of the isolation wall, the filling material is continuously poured into the bag at the temporary grouting station until the bag is completely filled to form a fire isolation wall.
2. The method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high geothermal mine according to claim 1, characterized in that: In step (3), the suitable position is a fully enclosed ventilation surface that blocks the return air corner; The bags are stacked to form the fireproof isolation wall.
3. The method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high geothermal mine according to claim 2, characterized in that: The process of determining the ventilation surface of the return air corner is as follows: (3.1) Obtaining basic data of the return air corner, including the depth of the return air corner , shape, bending angle and length ; (3.2) Based on the pre-built rule engine, identify and mark the fire high-risk area of the return air corner, obtain the isolation parameters between the adjacent fire high-risk areas, build a fire isolation status assessment model, and generate the isolation status assessment coefficient based on the pre-processed isolation parameters , the isolation state evaluation coefficient Does not exceed the preset status threshold Send out early warning signals to the adjacent high-risk fire areas; (3.3) Establish the return air corner channel model based on BIM software, and in the return air corner channel model, predetermine the ventilation surface and establish the construction position of the fire isolation wall until the isolation status evaluation coefficient is Exceeding the status threshold until; (3.4) Use software simulation to simulate and analyze the fire isolation effect, and obtain the density of flames bursting out of the ventilation surface after a fire occurs during each simulation. H and duration T , combined with the isolation status evaluation coefficient , build a data calculation model to generate the fire protection assessment value of the return air corner ; (3.5) The fire assessment value generated Compared with the preset standard threshold Compare and if the fire rating value Below the standard threshold , then the predetermined ventilation surface meets the requirements of the appropriate position; otherwise it does not.
4. The method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high geothermal mine according to claim 3, characterized in that: In step (3.2), calculate the isolation status assessment coefficient The formula is: In the above formula, , , are the lengths of the return air corners ,depth And the bending angle The proportionality coefficient of .
5. The method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high-temperature mine according to claim 4, characterized in that: Generate the fire rating The formula is: In the above formula, and The density means , mean duration The preset scaling factor of .
6. A system for building a fireproof isolation wall at a corner of a self-igniting coal seam in a deep high-temperature mine, characterized in that: The system includes a temporary grouting station built in the return air chute yard of the coal mining face, and a loader and a large flow grouting pump equipped with the temporary grouting station. The grouting pipeline of the temporary grouting station is laid along the return air chute to the return air corner; The temporary grouting station is also equipped with at least three times of filling materials; At a suitable position in the return air corner, a fireproof isolation wall with a rapidly moldable bag as a base is constructed. The fireproof isolation wall is formed by pouring filling material into the bag on the day of construction of the isolation wall.
7. The system for constructing a fireproof isolation wall for a return air corner of a self-igniting coal seam in a deep high-temperature mine according to claim 6 is characterized in that: The suitable position is a fully enclosed ventilation surface that blocks the return air corner, and the bags are stacked to form the fireproof isolation wall.
8. The system for constructing a fireproof isolation wall for a return air corner of a self-igniting coal seam in a deep high-geothermal mine according to claim 7 is characterized in that: The process of determining the ventilation surface of the return air corner is as follows: (1) Obtaining basic data of the return air corner, including the depth of the return air corner , shape, bending angle and length ; (2) Based on the pre-built rule engine, identify and mark the fire high-risk area of the return air corner, obtain the isolation parameters between the adjacent fire high-risk areas, build a fire isolation status assessment model, and generate the isolation status assessment coefficient based on the pre-processed isolation parameters , the isolation state evaluation coefficient Does not exceed the preset status threshold Send out early warning signals to the adjacent high-risk fire areas; (3) Establish the return air corner channel model based on BIM software, and in the return air corner channel model, predetermine the ventilation surface and establish the construction position of the fire isolation wall until the isolation status evaluation coefficient is Exceeding the status threshold until; (4) Use software simulation to simulate and analyze the fire isolation effect, and obtain the density of flames bursting out of the ventilation surface after a fire occurs during each simulation. H and duration T , combined with the isolation status evaluation coefficient , build a data calculation model to generate the fire protection assessment value of the return air corner ; (5) The generated fire assessment value Compared with the preset standard threshold Compare and if the fire rating value Below the standard threshold , then the predetermined ventilation surface meets the requirements of the appropriate position; otherwise it does not.
9. The method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high geothermal mine according to claim 8, characterized in that: In step (3.2), calculate the isolation status assessment coefficient The formula is: In the above formula, , , are the lengths of the return air corners ,depth And the bending angle The proportionality coefficient of .
10. The method for constructing a fireproof isolation wall at a corner of a spontaneous combustion coal seam in a deep high geothermal mine according to claim 9, characterized in that: Generate the fire rating The formula is: In the above formula, and The density means , mean duration The preset scaling factor of .