Intelligent monitoring and nitrogen injection device for spontaneous combustion in goaf

Abstract

The utility model belongs to the technical field of coal mine fire prevention and extinguishing safety, and particularly relates to an intelligent goaf spontaneous combustion monitoring and nitrogen injection device which mainly comprises a circular-truncated-cone-shaped pressure-bearing protective shell, a pressure-bearing plate, a pressure-resistant steel ring, a multi-parameter monitoring probe, a nitrogen injection nozzle and an intelligent control switch. The pressure-bearing plate is located at the top end of the circular-truncated-cone-shaped pressure-bearing protection shell, the compression-resistant steel rings are symmetrically distributed in the circular-truncated-cone-shaped pressure-bearing protection shell, the multi-parameter monitoring probes and the nitrogen injection nozzles are distributed on the periphery, and the multi-parameter monitoring probes are located on the lower sides of the nitrogen injection nozzles. And the intelligent control switch is connected with the nitrogen injection hose. According to the device, accurate division of three zones of spontaneous combustion of the goaf is achieved by laying the monitoring devices in different areas, the change conditions of the three zones of the goaf can be monitored in real time, nitrogen injection in different areas is further achieved, the spontaneous combustion risk of residual coal is accurately prevented and controlled, and the reliability of the goaf is improved. The problems that the spatial law of spontaneous combustion of the residual coal in the goaf cannot be accurately mastered, the nitrogen injection range is small, the nitrogen injection effect is poor, and nitrogen injection is not timely are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of goaf spontaneous combustion, in particular to a goaf spontaneous combustion intelligent monitoring and nitrogen injection device. BACKGROUND

[0002] Coal has been the main energy source in China for a long time, but in the process of coal mining, coal spontaneous combustion has become an important danger source threatening underground workers, and coal spontaneous combustion has seriously restricted the safety production of mines.

[0003] With the continuous upgrading of coal mining methods and processes, coal production has increased, but at the same time, residual coal in goaf has also gradually increased. In the process of coal seam mining, an oxidation heating zone will appear in the goaf. If the oxidation heating zone is not treated, it will cause residual coal spontaneous combustion hazards to a great extent. Once the goaf coal spontaneous combustion occurs, it will have a high probability of causing coal mine fire and secondary disasters such as gas and coal dust explosion. The current goaf fire prevention and extinguishing method generally includes the following steps: first, detecting the division of the goaf spontaneous combustion "three zones", and then injecting nitrogen for fire prevention and extinguishing by methods such as buried pipe injection and supporting pipe injection. However, due to the influence of factors such as the advancing speed of the mining face and the amount of residual coal, the goaf spontaneous combustion "three zones" also change constantly, and the traditional nitrogen injection method has problems such as small nitrogen diffusion range, limited effective range, and low nitrogen injection fire extinguishing efficiency, which cannot effectively prevent and control the residual coal spontaneous combustion disaster. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a goaf spontaneous combustion intelligent monitoring and nitrogen injection device, which aims to arrange intelligent monitoring and nitrogen injection devices by zones, dynamically monitor the change law of the oxidation zone range of the goaf, and accurately prevent and control the ignition risk points of the goaf, so as to realize the integration of monitoring and intelligent fire prevention and extinguishing.

[0005] To solve the above technical problems, the present application provides a goaf spontaneous combustion intelligent monitoring and nitrogen injection device, which mainly comprises: a circular truncated cone pressure bearing protective shell, a pressure bearing plate, a pressure resisting steel ring, a multi-parameter monitoring probe, a nitrogen injection nozzle, and an intelligent control switch. The pressure bearing plate is located at the top end of the circular truncated cone pressure bearing protective shell, the pressure resisting steel ring is symmetrically distributed inside the circular truncated cone pressure bearing protective shell, the multi-parameter monitoring probe and the nitrogen injection nozzle are distributed around, and the multi-parameter monitoring probe is located below the nitrogen injection nozzle. The intelligent control switch is connected to the nitrogen injection hose.

[0006] Further, the nitrogen injection branch pipe is composed of a flexible metal hose, has the characteristics of pressure resistance and rust prevention, and is connected to the nitrogen injection main pipe through a multi-circuit connection device.

[0007] Further, the goaf spontaneous combustion intelligent monitoring and nitrogen injection device is characterized in that the monitoring and nitrogen injection device is arranged in a partitioned manner, and accurate positioning of the spontaneous combustion "three zones" and accurate prevention and control of the spontaneous combustion danger points can be realized.

[0008] Further, the circular truncated cone pressure-bearing protective shell is made of metal iron material, the top of the circular truncated cone is a steel pressure-bearing plate, two compression-resistant steel rings are arranged in the circular truncated cone pressure-bearing protective shell, a base groove is arranged at the lower part, and the base groove is buried in the bottom plate when the circular truncated cone pressure-bearing protective shell is laid to protect the nitrogen injection branch pipes and transmission lines.

[0009] Further, four groups of nitrogen injection nozzles are arranged in the middle and upper parts of the circular truncated cone pressure-bearing protective shell, and the interval angle of each nozzle is 90 0 and upwardly inclined by 35 0 arranged and fixed and sealed by fixed grooves.

[0010] Further, four groups of multi-parameter monitoring probes are arranged in the middle and lower parts of the circular truncated cone pressure-bearing protective shell, and the interval angle of each probe is also 90 0 sealed and fixed by fixed grooves, and a moisture-proof agent is arranged in the fixed grooves.

[0011] Further, the multi-parameter monitoring probe comprises a methane probe, a carbon monoxide probe, a temperature probe and a carbon dioxide probe.

[0012] Further, the intelligent control switch can be controlled by an information processing system and can also be automatically controlled according to the data monitored by the goaf spontaneous combustion intelligent monitoring and nitrogen injection device.

[0013] Further, the device has a height of 25 cm, the upper circular truncated cone has a radius of 5 cm, the lower circular truncated cone has a radius of 10 cm, the bottom base groove is a cylinder with a radius of 3.5 cm and a height of 7 cm.

[0014] Compared with the prior art, the goaf spontaneous combustion intelligent monitoring and nitrogen injection device has the advantages that the goaf spontaneous combustion intelligent monitoring and nitrogen injection device is laid in a partitioned manner, the goaf spontaneous combustion risk points can be comprehensively covered, the changes of the goaf spontaneous combustion "three zones" can be continuously and dynamically monitored, the spatial and temporal evolution law of the goaf spontaneous combustion ignition area can be accurately mastered, the nitrogen injection range is expanded through partitioned nitrogen injection, and the effect of the residual coal fire prevention and extinguishing is improved under the premise of reducing the labor input through intelligent control. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and other related drawings can also be obtained by those skilled in the art without any creative effort.

[0016] Fig. 1 is a structural schematic diagram of a goaf spontaneous combustion intelligent monitoring and nitrogen injection device provided by the present application;

[0017] Fig. 2 is a use scene diagram provided by the embodiments of the present application;

[0018] Fig. 3 is a device laying schematic diagram provided by the embodiments of the present application.

[0019] In the figure: 1. Nitrogen injection nozzle; 2. Intelligent control switch; 3. Multi-parameter monitoring probe; 4. Base groove; 5. Communication port; 6. Pressure-resistant steel ring; 7. Pressure-bearing plate; 8. Coal seam floor; 9. Intake airway; 10. Transmission line; 11. Nitrogen injection main pipe; 12. Return airway; 13. Nitrogen injection branch pipe; 101. Round table-shaped pressure-bearing protective shell. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0022] Please refer to Figs. 1-3 The present application provides a goaf spontaneous combustion intelligent monitoring and nitrogen injection device, comprising the following steps: S1: nitrogen injection main pipe laying: laying the nitrogen injection main pipe 11 along the intake airway, and the laying end should exceed the mining face by a certain distance.

[0023] S2: Subarea laying of goaf spontaneous combustion intelligent monitoring and nitrogen injection device: first, according to the specific conditions of the goaf in the mine, the goaf is divided into subareas, the number and distance of the device to be laid are determined, and the device is laid according to the divided subareas.

[0024] S3: Install nitrogen injection pipeline machine transmission line, connect the nitrogen injection branch pipe 13 with the nitrogen injection main pipe 11 through the multi-loop connection device, and connect the nitrogen injection branch pipes 13 and the transmission lines of each device, bury the nitrogen injection branch pipes 13 and the transmission lines under the coal seam floor for protection, and connect the end of the transmission line with the information processing system.

[0025] S4: Determine the division of the spontaneous combustion "three zones" and the ignition risk point, cover the device with the coal seam collapse, and monitor the temperature and index gas changes of the residual coal in the partition through the multi-parameter monitoring probe 3, and upload the monitoring results to the information processing system in real time, and the system analyzes the division of the "three zones" in the goaf and marks the ignition risk point.

[0026] S5: Partition nitrogen injection to the ignition risk point, once the partition is monitored to have the risk of residual coal spontaneous combustion, the goaf spontaneous combustion intelligent monitoring and nitrogen injection device will open the intelligent control switch 2, and the nitrogen gas will be sprayed into the residual coal through the nitrogen injection impact head to achieve the effect of fire prevention and extinguishing.

[0027] Specifically, the goaf spontaneous combustion intelligent monitoring and nitrogen injection device is arranged in partitions, the arrangement interval and the arrangement number of the device are determined according to the size of the goaf and the specific situation of the mining area, so as to ensure that the monitoring accuracy of the goaf spontaneous combustion "three zones" and the nitrogen injection range are allowed, and the cost is reduced.

[0028] In the specific setting, the nitrogen injection branch pipe 13 and the transmission line are both buried in the coal seam floor to avoid damage to the management and the transmission line caused by the collapse of residual coal.

[0029] In some specific embodiments, after the goaf spontaneous combustion intelligent monitoring and nitrogen injection device is arranged, the nitrogen injection nozzle 1 and the multi-parameter monitoring probe 3 need to be wrapped with iron sand net to prevent damage caused by residual coal, and to prevent blockage of residual coal and dust.

[0030] The working principle of the goaf spontaneous combustion intelligent monitoring and nitrogen injection device and method is as follows:

[0031] First step, lay the nitrogen injection main pipe 11, the nitrogen injection main pipe 11 is laid along the air inlet lane, and the end of the laid pipe exceeds the mining face by a certain distance. The end of the nitrogen injection main pipe 11 is connected with a plurality of nitrogen injection branch pipes 13 through a multi-loop connection device.

[0032] Second step, divide the goaf of the mining area, and determine the specific interval and the specific number of the devices to be arranged.

[0033] Third step, lay the goaf spontaneous combustion intelligent monitoring and nitrogen injection device, bury the base trench of the device in the coal seam floor, connect the nitrogen injection branch pipes 13 and the transmission lines of each device, bury the nitrogen injection branch pipes 13 and the transmission lines in the floor, avoid damage caused by the collapse of the coal seam, and connect the end of the transmission line with the information processing system.

[0034] The fourth step is that the multi-parameter monitoring probe 3 monitors the change of the internal temperature and index gas of the residual coal, and transmits the data to the information processing system through the transmission line, and the system analyzes the division of the "three zones" of the goaf spontaneous combustion and the change of the oxidation temperature zone.

[0035] The fifth step is that the information processing system sets the intelligent control switch 2 in a manual state or an automatic state. When in the automatic state, if the multi-parameter monitoring probe 3 detects that the residual coal has a spontaneous combustion danger, the intelligent control switch is automatically opened to inject nitrogen into the goaf through the nitrogen injection nozzle 1. If in the manual state, the personnel needs to manually input the opening command of the intelligent control switch on the system to continue to inject nitrogen.

Claims

1. A goaf spontaneous combustion intelligent monitoring and nitrogen injection device, the device mainly comprises: The device comprises a round-taile-shaped pressure-bearing protective shell (101), a pressure-bearing plate (7), a pressure-resistant steel ring (6), a multi-parameter monitoring probe (3), a nitrogen injection nozzle (1), and an intelligent control switch (2). The pressure-bearing plate (7) is located at the top of the round-taile-shaped pressure-bearing protective shell (101), the pressure-resistant steel ring (6) is symmetrically distributed inside the round-taile-shaped pressure-bearing protective shell (101), the multi-parameter monitoring probe (3) and the nitrogen injection nozzle (1) are distributed around, and the multi-parameter monitoring probe is located below the nitrogen injection nozzle, and the intelligent control switch (2) is connected with the nitrogen injection hose.

2. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The nitrogen injection branch pipe (13) is made of flexible metal hose, and the nitrogen injection branch pipe is connected with the nitrogen injection main pipe through a multi-circuit connecting device.

3. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The device is arranged in a partitioned manner.

4. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The round-taile-shaped pressure-bearing protective shell (101) is made of metal iron material, the top of the round table is a steel pressure-bearing plate (7), two pressure-resistant steel rings (6) are arranged inside the round-taile-shaped pressure-bearing protective shell, a base groove (4) is arranged at the lower part, and the base groove is buried in the bottom plate during laying of the round-taile-shaped pressure-bearing protective shell (101) to protect the nitrogen injection branch pipe (13) and the transmission line.

5. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The upper part of the circular-truncated-cone pressure containment shell (101) is provided with 4 groups of nitrogen injection nozzles (1), and the interval angle of each nozzle is 90 0 and upwardly inclined by 35 0 The fixed groove is arranged and used for fixing and sealing.

6. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The lower part of the circular-truncated-cone pressure containment shell (101) is provided with 4 groups of multi-parameter monitoring probes (3), and the interval angle of each probe is also 90 0 The fixed groove is used for sealing and fixing, and a moisture-proof agent is placed in the fixed groove.

7. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The multi-parameter monitoring probe (3) comprises a methane probe, a carbon monoxide probe, a temperature probe, and a carbon dioxide probe.

8. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The intelligent control switch (2) can be controlled by an information processing system, or can be automatically controlled according to the data monitored by the goaf spontaneous combustion intelligent monitoring and nitrogen injection device.

9. The intelligent monitoring and nitrogen injection device for goaf spontaneous combustion according to claim 1, characterized in that The device has a size of 25 cm in height, a radius of 5 cm at the upper part of the round table, a radius of 10 cm at the lower part of the round table, a cylindrical base groove with a radius of 3.5 cm and a height of 7 cm.

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