Method for precisely monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire

Abstract

The invention discloses a goaf coal spontaneous combustion precise monitoring and fire preventing and extinguishing method, and belongs to the technical field of coal mine fire prevention and control. A foam box protected by a high-pressure-resistant shell is placed on the side, close to a return airway, of a goaf of a coal seam stope face, the foam box is connected with a multifunctional data collector and an inflation pump which are located at the end of the return airway through a signal transmission line and a gas conveying pipeline, and a temperature detector and an index gas concentration detector are fixed to the inner side face of the foam box. The method is used for monitoring goaf temperature and index gas concentration. If it is monitored that the temperature and / or the index gas concentration of a certain position exceed the critical value, it is judged that the position has the coal spontaneous combustion danger, nitrogen or carbon dioxide can be immediately inflated into a foam box at the monitoring point through an inflation pump, foam mixed liquid in the foam box is excited to generate foam, and the foam flows into the goaf for fire extinguishing; and stopping gas injection after the temperature and the index gas concentration data of the monitoring point are recovered below the critical value. If the foam mixed liquid in the foam box is used up, but the temperature and / or the index gas concentration of the monitoring point still exceed the critical value, nitrogen or carbon dioxide can be continuously injected into the area until the temperature and the index gas concentration of the monitoring point are recovered to be below the critical value, and therefore goaf coal spontaneous combustion monitoring and fire preventing and extinguishing work are achieved. The method is simple and convenient to operate, can accurately and timely monitor the spontaneous combustion danger of the goaf coal, and realizes accurate fire prevention and extinguishing.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine fire prevention and control, and in particular relates to a method for accurately monitoring spontaneous combustion of coal in goaf areas and preventing and extinguishing fire. Background Art

[0002] Spontaneous combustion of coal in goaf is one of the main disasters faced in the process of coal mining in my country, which affects the normal coal seam mining activities. The coal in the goaf of coal mines is slowly oxidized under the condition of continuous air leakage, which affects the concentration and temperature changes of the index gas in the goaf, and increases the risk of spontaneous combustion of coal in the goaf to a certain extent. At present, the monitoring of spontaneous combustion of coal in goaf usually adopts the methods of bundle tube monitoring, infrared monitoring and manual sampling. It is necessary to deploy bundle tube monitoring system and temperature sensor and other equipment in advance, or the technicians go down the well to collect gas and take the ground analyzer to analyze the gas composition to monitor the risk of spontaneous combustion of coal in the goaf of the working face. However, the existing monitoring equipment and means can only be used for monitoring near the mining working face or near the two lanes, and it is impossible to achieve accurate monitoring of the fire hazard area of ​​the entire goaf; and in terms of fire prevention and extinguishing in the goaf, the current grouting, inert gas injection and other technologies cannot achieve accurate fire prevention and extinguishing work. Therefore, there is an urgent need for an accurate monitoring and fire prevention method that can effectively target the spontaneous combustion of coal in closed goaf. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, the present invention provides a method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions: A method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire, characterized in that: monitoring points are evenly arranged on one side of the return air lane in the goaf of the coal seam mining face, and a foam box protected by a high-pressure resistant shell is placed at each monitoring point during the mining process of the mining face; Optionally, a hole is provided on each of the front, rear, left and right sides of the high-pressure resistant shell, and is connected to the end of the return air channel through a high-pressure resistant hose; Optionally, a temperature sensor and an index gas concentration sensor are placed inside the high-pressure resistant shell of each monitoring point, and are respectively connected to a multifunctional data collector placed at the end of the return air lane through a signal transmission line; Optionally, the foam box contains a foam mixture; Optionally, the foam box at each monitoring point is connected to the air pump at the end of the return air lane through an air pipeline, and a pressure-sensitive sealing cover is provided at the connection between the foam box and the air pipeline; Optionally, the pressure-sensitive sealing cover can be automatically opened under a specific gas pressure; Optionally, the signal transmission line and the gas transmission pipeline are both arranged inside the high-pressure resistant hose.

[0005] Optionally, a method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire is provided, characterized in that: accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire is performed according to the following steps: Phase 1: During the advancement of the mining face, if the multifunctional data collector detects that the temperature and / or index gas concentration at a certain location exceeds the critical value, it is judged that there is a risk of spontaneous combustion of coal at that location. At this time, the multifunctional data collector sends an alarm signal; The second stage: once the multifunctional data collector sends out an alarm signal, nitrogen or carbon dioxide is immediately filled into the gas pipeline of the monitoring point using an air pump. When the gas pressure in the gas pipeline reaches a specific value, the pressure-sensitive sealing cover automatically opens, allowing nitrogen or carbon dioxide gas to enter the foam box, stimulating the foam mixture in the foam box to produce foam, and then flowing into the goaf to extinguish the fire; stop gas injection after the temperature and index gas concentration of the monitoring point are restored to below the critical value; The third stage: If the foam mixture in the foam box has been used up, but the temperature and / or index gas concentration at the monitoring point still exceeds the critical value, nitrogen or carbon dioxide can continue to be injected into the area through the air pump to implement fire extinguishing until the temperature and index gas concentration at the monitoring point return to below the critical value, thereby realizing the spontaneous combustion monitoring and fire prevention and extinguishing of coal in the goaf.

[0006] The beneficial effects of the present invention are: The method for monitoring and preventing fire in goaf areas provided by the present invention is easy to operate, can accurately monitor the risk of spontaneous combustion of coal in specific areas of goaf areas, and take precise fire prevention and extinguishing measures, thereby realizing precise monitoring of the risk of spontaneous combustion of coal in goaf areas and preventing fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the arrangement of goaf area monitoring equipment in the present invention.

[0008] Figure 2 It is a schematic diagram of the connection structure of the foam box and related pipelines at a certain monitoring point in the present invention.

[0009] In the figure: 1- goaf; 2- mining working face; 3- return air lane; 4- gas pipeline; 5- signal transmission line; 6- air pump; 7- multi-function data collector; 8- foam box; 9- high pressure resistant hose; 10- high pressure resistant shell; 11- hole; 12- temperature sensor; 13- index gas concentration sensor; 14- pressure sensing sealing cover. DETAILED DESCRIPTION

[0010] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0011] like Figure 1 and Figure 2As shown, a method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire is characterized in that: monitoring points are evenly arranged on one side of the return airway (3) in the goaf (1) of the coal seam recovery working face (2), and a foam box (8) protected by a high-pressure resistant shell (10) is placed at each monitoring point during the recovery process of the recovery working face (2); The front, rear, left and right sides of the high-pressure resistant shell (10) are each provided with a hole (11), and are connected to the end of the return air channel (3) through a high-pressure resistant hose (9); A temperature sensor (12) and an index gas concentration sensor (13) are placed inside the high-pressure resistant casing (10) of each monitoring point, and are respectively connected to a multifunctional data collector (7) placed at the end of the return air lane (3) via a signal transmission line (5); The foam box (8) is filled with a foam mixture; The foam box (8) at each monitoring point is connected to the air pump (6) at the end of the return air channel (3) via the air pipeline (4), and a pressure-sensitive sealing cover (14) is provided at the connection between the foam box (8) and the air pipeline (4); The pressure-sensitive sealing cover (14) can be automatically opened under the action of a specific gas pressure; The signal transmission line (5) and the gas transmission pipeline (4) are both arranged inside the high-pressure resistant hose (9); The monitoring points are evenly arranged in sequence from the return air tunnel (3) to the inside of the goaf (1), with a spacing of 40 to 50 m, and are continuously arranged every 40 to 50 m along the advancing direction of the mining working face (2).

[0012] like Figure 1 and Figure 2 As shown, follow the steps below to carry out precise monitoring of spontaneous combustion of coal and fire prevention and extinguishing in goaf areas (1): Phase 1: During the advancement of the mining face (2), if the multifunctional data collector (7) detects that the temperature and / or the concentration of the index gas at a certain location exceeds the critical value, it is determined that there is a risk of spontaneous combustion of coal at that location. At this time, the multifunctional data collector (7) sends an alarm signal; The second stage: once the multifunctional data collector (7) sends out an alarm signal, nitrogen or carbon dioxide is immediately charged into the gas pipeline (4) of the monitoring point by using the gas charging pump (6). When the gas pressure in the gas pipeline (4) reaches a specific value, the pressure-sensitive sealing cover (14) automatically opens, allowing nitrogen or carbon dioxide gas to enter the foam box (8), stimulating the foam mixture in the foam box (8) to generate foam, which then flows into the goaf (1) to extinguish the fire. After the temperature and the index gas concentration of the monitoring point are restored to below the critical value, the gas injection is stopped. Phase 3: If the foam mixture in the foam box (8) has been used up, but the temperature and / or index gas concentration at the monitoring point still exceeds the critical value, nitrogen or carbon dioxide can continue to be injected into the area through the air pump (6) to implement fire extinguishing, until the temperature and index gas concentration at the monitoring point return to below the critical value, thereby achieving the coal spontaneous combustion monitoring and fire prevention and extinguishing work in the goaf (1).

[0013] Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. It should be noted that all equivalent substitutions and obvious deformation forms made by any technician familiar with the field under the guidance of this specification fall within the essential scope of this specification and should be protected by the present invention.

Claims

1. A method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire, characterized in that: Evenly arrange monitoring points on one side of the return airway in the goaf of the coal seam mining face, and place a foam box protected by a high-pressure resistant shell at each monitoring point during the mining process of the mining face; A hole is arranged on each of the front, rear, left and right sides of the high-pressure resistant shell, and is connected to the end of the return air channel through a high-pressure resistant hose; A temperature sensor and an index gas concentration sensor are placed inside the high-pressure resistant shell of each monitoring point, and are respectively connected to a multifunctional data collector placed at the end of the return air lane through a signal transmission line; The foam box is filled with a foam mixture; The foam box at each monitoring point is connected to the air pump at the end of the return air lane through the air pipeline, and a pressure-sensitive sealing cover is provided at the connection between the foam box and the air pipeline; The pressure-sensitive sealing cover can be automatically opened under the action of a specific gas pressure; The signal transmission line and the gas transmission pipeline are both arranged inside the high-pressure resistant hose.

2. According to claim 1, a method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire, characterized in that: The monitoring points are evenly arranged in sequence of 3 to 5 from the return air channel to the inside of the goaf, with an interval of 40 to 50 m, and are continuously arranged every 40 to 50 m along the advancement direction of the mining working face.

3. The method for accurately monitoring spontaneous combustion of coal in goaf and preventing and extinguishing fire according to claim 1 is characterized in that: Follow the steps below to accurately monitor spontaneous combustion of coal in goaf areas and prevent and extinguish fires: Phase 1: During the advancement of the mining face, if the multifunctional data collector detects that the temperature and / or index gas concentration at a certain location exceeds the critical value, it is judged that there is a risk of spontaneous combustion of coal at that location. At this time, the multifunctional data collector sends an alarm signal; The second stage: once the multifunctional data collector sends out an alarm signal, nitrogen or carbon dioxide is immediately filled into the gas pipeline of the monitoring point using an air pump. When the gas pressure in the gas pipeline reaches a specific value, the pressure-sensitive sealing cover automatically opens, allowing nitrogen or carbon dioxide gas to enter the foam box, stimulating the foam mixture in the foam box to produce foam, and then flowing into the goaf to extinguish the fire; stop gas injection after the temperature and index gas concentration of the monitoring point are restored to below the critical value; The third stage: If the foam mixture in the foam box has been used up, but the temperature and / or index gas concentration at the monitoring point still exceeds the critical value, nitrogen or carbon dioxide can continue to be injected into the area through the air pump to implement fire extinguishing until the temperature and index gas concentration at the monitoring point return to below the critical value, thereby realizing the spontaneous combustion monitoring and fire prevention and extinguishing of coal in the goaf.

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