Ventilated goaf air leakage detection and residual coal spontaneous combustion prevention and control device

Abstract

The invention belongs to the technical field of coal mine tunnel ventilation, and particularly relates to a ventilation goaf air leakage detection and residual coal spontaneous combustion prevention device which comprises gob-side entry retaining. The sulfur hexafluoride gas is released in the corner area of the gob-side entry retaining, and the gob-side entry retaining is provided with a plurality of fireproof measuring points; the fireproof measuring point comprises a gas taking assembly, a temperature measuring assembly and a liquid nitrogen output assembly; the protection assembly is arranged outside the gas taking assembly, the temperature measuring assembly and the liquid nitrogen output assembly in a sleeving manner; when the temperature measuring assembly measures that the temperature around the measuring point is higher than a set value or coal spontaneous combustion mark gas such as CO is found in the detected gas, the controller of the measuring point starts the audible and visual alarm and the liquid nitrogen output assembly, the liquid nitrogen output assembly directly injects liquid nitrogen into the goaf, the temperature of the measuring point area is reduced, and a gas field of the measuring point area is inerted; the oxygen concentration is reduced, further oxidation of residual coal in the goaf is inhibited, necessary conditions for spontaneous combustion of the residual coal are reduced, and the residual coal spontaneous combustion prevention effect is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of coal mine roadway ventilation technology, specifically a device for detecting air leakage in ventilation goaf areas and preventing spontaneous combustion of residual coal. Background Technology

[0002] The roof-cutting, pressure-relief, gob-side roadway-based pillarless mining technology is considered the third exploration of technological transformation in my country's mining industry. This technology involves pre-splitting the roof with blasting, utilizing mine pressure to cut off stress transmission in part of the roof, achieving automatic gob-side roadway-based and pillarless mining. To recover one working face, only one roadway needs to be excavated, offering significant advantages such as less roadway excavation, higher coal recovery rate, and less stress concentration hazards. It has already been tested and promoted in multiple mining areas across the country. Compared to the traditional "U"-shaped ventilation method, the "Y"-shaped ventilation method can effectively solve the problem of excessive gas levels in the upper corner of the coal face. Currently, the commonly used monitoring method for air leakage in the ventilated gob area is pre-embedded bundled tube gas monitoring.

[0003] However, the above technologies often have the following drawbacks: gas sampling monitoring through pre-embedded bundle tubes has limited gas sampling capacity, and the effect of preventing spontaneous combustion of residual coal still needs to be improved. Therefore, it is necessary to adopt new methods to further optimize the measures for preventing air leakage in goaf and spontaneous combustion of residual coal under the "Y" type ventilation mode. To this end, a device for detecting air leakage in ventilation goaf and preventing spontaneous combustion of residual coal is proposed. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem mentioned in the background art has been solved.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: The device for detecting air leakage in a ventilated goaf and preventing spontaneous combustion of residual coal, as described in this invention, includes a goaf-side roadway; sulfur hexafluoride gas is released in the corner area of ​​the goaf-side roadway; several fire prevention measuring points are set in the goaf-side roadway; the fire prevention measuring points include a gas intake component, a temperature measurement component, and a liquid nitrogen output component; a protection component is sleeved on the outside of the gas intake component, the temperature measurement component, and the liquid nitrogen output component; a controller and an audible and visual alarm are set on the top of the protection component.

[0006] Preferably, the protective component includes a flower tube and an iron bundle tube, the bottom of the flower tube is connected to the top of the iron bundle tube, handles are symmetrically arranged on the outer surface of the flower tube, screws are connected to the handles, and a controller and an audible and visual alarm are provided on the top of the flower tube.

[0007] Preferably, the bottom of the flower tube is provided with polyurethane, the bottom of the iron bundle tube is provided with quick-drying cement, and both the polyurethane and the quick-drying cement are wrapped around the outer surface of the gas intake component, the temperature measurement component and the liquid nitrogen output component.

[0008] Preferably, the gas sampling assembly includes a gas sampling tube, one end of which is connected to an automatic negative pressure gas sampler, the automatic negative pressure gas sampler is connected to an airbag, the other end of which is connected to a gas sampling probe, the gas sampling probe having a gas sampling hole, and a solenoid valve being provided on the gas sampling tube near the gas sampling probe.

[0009] Preferably, the outer surface of the gas sampling probe is provided with iron sand mesh, and the iron sand mesh is wrapped around the outer surface of the gas sampling probe by cable ties.

[0010] Preferably, the temperature measurement component is a temperature sensor, which includes a temperature sensor dial, wires, and a temperature probe, with the bottom of the temperature probe flush with the bottom of the gas sampling probe.

[0011] Preferably, the wire and the temperature probe are both fitted with a copper tube.

[0012] Preferably, the copper tube is filled with sealant, which is then wrapped around the outer surface of the conductor.

[0013] Preferably, the liquid nitrogen output assembly includes a liquid nitrogen pipe connected to a valve and a liquid nitrogen tank for storing liquid nitrogen.

[0014] Preferably, several fire prevention monitoring points are distributed at equal intervals along the run-through, with a spacing of 30 to 50 meters between every two fire prevention monitoring points.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The present invention discloses a device for detecting air leakage in a ventilated goaf and preventing spontaneous combustion of residual coal. This device involves setting up several fire prevention measuring points along the goaf roadway, all activated by a controller. The gas collected by the gas sampling component is analyzed using a gas chromatograph. Based on the concentration of sulfur hexafluoride gas in the gas sample from each measuring point's roadway area, the air leakage volume, leakage rate, and leakage channel of that section can be calculated, greatly increasing the number of gas samples collected and avoiding the limitation of sample quantity. A temperature measuring component measures the temperature around the measuring points within the goaf and transmits the data to the controller. When the temperature measuring component detects that the temperature around the measuring point is higher than a set value or detects CO or other gases indicative of spontaneous combustion of coal in the gas, the controller at that measuring point will activate an audible and visual alarm and output liquid nitrogen. The liquid nitrogen output component directly injects liquid nitrogen into the goaf, lowering the temperature of the measuring point area, inerting the gas field in the measuring point area, reducing the oxygen concentration, inhibiting further oxidation of residual coal within the goaf, reducing the necessary conditions for spontaneous combustion of residual coal, and effectively improving the prevention and control effect of spontaneous combustion of residual coal.

[0017] 2. The ventilation goaf detection and residual coal spontaneous combustion prevention device of the present invention, by setting up a protective component composed of a perforated pipe and an iron bundle pipe, facilitates the protection of the gas intake component, temperature measurement component and liquid nitrogen output component, and prevents the gas intake component, temperature measurement component and liquid nitrogen output component from being damaged by falling coal blocks and stones.

[0018] 3. The ventilation goaf detection and spontaneous combustion prevention device of the present invention uses polyurethane and quick-drying cement for sealing to ensure that only the gas in the measuring area is extracted when the gas is extracted through the gas sampling component, thus eliminating the influence of the gas inside the protective component composed of the perforated pipe and iron bundle tube on the sampled gas. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a bottom-view three-dimensional structural diagram of the iron bundle tube in this invention;

[0022] Figure 3 This is the main sectional view in this invention;

[0023] Figure 4 This is a partial cross-sectional view of the iron bundle tube in this invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the liquid nitrogen tube in this invention;

[0025] Figure 6 This is a three-dimensional structural schematic diagram of the gas extraction tube in this invention;

[0026] Figure 7 This is a front sectional view of the gas extraction tube in this invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the copper tube in this invention;

[0028] Figure 9 This is a front sectional view of the copper tube in this invention.

[0029] In the diagram: 10. Gas sampling tube; 11. Automatic negative pressure gas sampler; 12. Airbag; 13. Solenoid valve; 14. Gas sampling probe; 15. Iron mesh; 16. Cable tie; 20. Temperature sensor dial; 21. Wire; 22. Temperature probe; 23. Copper tube; 24. Sealant; 30. Liquid nitrogen tube; 31. Valve; 32. Liquid nitrogen tank; 40. Perforated tube; 41. Polyurethane; 50. Iron tube; 51. Quick-drying cement; 60. Handle; 61. Screw; 70. Controller; 71. Audible and visual alarm. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Example: Figures 1 to 9 As shown in the embodiment of the present invention, a device for detecting air leakage in a goaf and preventing spontaneous combustion of residual coal includes a goaf-side roadway; sulfur hexafluoride gas is released in the corner area of ​​the goaf-side roadway; several fire prevention measuring points are set in the goaf-side roadway; each fire prevention measuring point includes a gas sampling component, a temperature measurement component, and an output liquid nitrogen component; a protective component is fitted outside the gas sampling component, temperature measurement component, and output liquid nitrogen component; a controller 70 and an audible and visual alarm 71 are set on the top of the protective component; during sampling, several fire prevention measuring points are set in the goaf-side roadway and are all activated by the controller 70, releasing sulfur hexafluoride gas in the corner area of ​​the goaf-side roadway, and both the gas sampling component and the temperature measurement component enter the working state. The gas sampling component can extract the gas composition around the measuring point inside the goaf, and the staff analyzes the gas collected by the gas sampling component using a gas chromatograph (not shown in the figure), and analyzes the gas composition based on the sulfur hexafluoride gas in the goaf-side roadway area of ​​each measuring point. The concentration of sulfur fluoride gas allows for the calculation of air leakage, leakage rate, and leakage channels in the area, greatly increasing the number of gas samples collected and avoiding the problem of limited sample quantity. The temperature measurement component measures the temperature around the measuring point inside the goaf and transmits the data to the controller 70. When the temperature measurement component detects that the temperature around the measuring point is higher than the set value or that CO or other gases indicating spontaneous combustion of coal are detected in the gas, the controller 70 at that measuring point will activate the audible and visual alarm 71 and the liquid nitrogen output component. The liquid nitrogen output component directly injects liquid nitrogen into the goaf, reducing the temperature in the measuring point area, inerting the gas field in the measuring point area, reducing the oxygen concentration, inhibiting further oxidation of residual coal inside the goaf, reducing the necessary conditions for spontaneous combustion of residual coal, and effectively improving the prevention and control effect of spontaneous combustion of residual coal. The audible and visual alarm 71 can provide audible and visual alarm prompts, making it easy for staff to quickly identify and locate the fire prevention measuring point based on the audible and visual prompts.

[0032] Furthermore, the protective assembly includes a perforated pipe 40 and an iron bundled pipe 50. The bottom of the perforated pipe 40 is connected to the top of the iron bundled pipe 50. Handles 60 are symmetrically arranged on the outer surface of the perforated pipe 40, and screws 61 are connected to the handles 60. A controller 70 and an audible and visual alarm 71 are arranged on the top of the perforated pipe 40. During operation, the handles 60 facilitate the picking and placing of the perforated pipe 40, and the screws 61 facilitate the limiting installation. By setting the perforated pipe 40 and the iron bundled pipe 50 to form a protective assembly, the gas intake assembly, the temperature measurement assembly, and the liquid nitrogen output assembly are protected from damage by falling coal and stones.

[0033] Furthermore, polyurethane 41 is installed at the bottom of the perforated tube 40, and quick-drying cement 51 is installed at the bottom of the iron bundle tube 50. Both polyurethane 41 and quick-drying cement 51 are wrapped around the outer surface of the gas sampling component, the temperature measurement component, and the liquid nitrogen output component. By using polyurethane 41 and quick-drying cement 51 for sealing, it is ensured that only the gas in the measurement area is extracted when the gas is extracted through the gas sampling component, thus eliminating the influence of the gas inside the protective component composed of perforated tube 40 and iron bundle tube 50 on the sampled gas.

[0034] Furthermore, the gas sampling assembly includes a gas sampling tube 10, one end of which is connected to an automatic negative pressure gas sampler 11, which is connected to an air bag 12. The other end of the gas sampling tube 10 is connected to a gas sampling probe 14, which has a gas sampling hole. A solenoid valve 13 is installed near the gas sampling probe 14 in the gas sampling tube 10. During operation, the automatic negative pressure gas sampler 11 is turned on, and the sampled gas enters the gas sampling tube 10 after passing through the gas sampling probe 14 and finally enters the air bag 12. Then, the staff analyzes the collected gas using a gas chromatograph.

[0035] Furthermore, an iron sand mesh 15 is provided on the outer surface of the gas sampling probe 14. The iron sand mesh 15 is bound and wrapped around the outer surface of the gas sampling probe 14 by cable ties 16. During operation, the iron sand mesh 15 is wrapped around the outer surface of the gas sampling probe 14 by cable ties 16, which can effectively prevent residual coal from entering the gas sampling hole opened by the gas sampling probe 14 and causing blockage.

[0036] Furthermore, the temperature measurement component is a temperature sensor, which includes a temperature sensor dial 20, a wire 21, and a temperature probe 22. The bottom of the temperature probe 22 is flush with the bottom of the gas intake probe 14. During operation, the temperature probe 22 detects the temperature at the detection location and analyzes and displays the measured data through the wire 21 and the temperature sensor dial 20. The data is then transmitted to the controller 70. The fact that the bottom of the temperature probe 22 is flush with the bottom of the gas intake probe 14 ensures that the measured temperature and the gas intake location are at the same level.

[0037] Furthermore, a copper tube 23 is fitted around both the wire 21 and the temperature probe 22. During operation, the copper tube 23 helps to limit and protect the wire 21 and the temperature probe 22, preventing the temperature probe 22 from swinging and getting damaged within the protection assembly.

[0038] Furthermore, the copper tube 23 is filled with sealant 24, which wraps around the outer surface of the wire 21. By setting the sealant 24, the wire 21 is fixed inside the copper tube 23, preventing the wire 21 from swinging inside the copper tube 23.

[0039] Furthermore, the liquid nitrogen output component includes a liquid nitrogen pipe 30, which is connected to a valve 31 and a liquid nitrogen tank 32, which is used to store liquid nitrogen. During operation, if the temperature measurement component detects an abnormal temperature, it transmits data or gas samples containing CO or other coal spontaneous combustion markers to the controller 70. After analysis, the controller 70 opens the valve 31, allowing the liquid nitrogen stored in the liquid nitrogen tank 32 to be injected into the goaf through the liquid nitrogen pipe 30. This reduces the temperature in the measurement area, inertizes the gas field in the measurement area, reduces the oxygen concentration, and inhibits further oxidation of residual coal in the goaf. This reduces the necessary conditions for spontaneous combustion of residual coal and effectively improves the prevention and control of spontaneous combustion of residual coal.

[0040] Furthermore, several fire prevention monitoring points are evenly distributed along the goaf, with a spacing of 30 to 50 meters between every two monitoring points. During operation, the fire prevention monitoring points are regularly and evenly distributed to facilitate better detection of air leakage in the ventilated goaf area and prevention of spontaneous combustion of residual coal.

[0041] In this invention, the gas chromatograph, controller 70, audible and visual alarm 71, valve 31, solenoid valve 13, and automatic negative pressure gas sampler 11 are all existing known technologies, and no improvements are made to them here, so they will not be described in detail; all electrical equipment required in this invention is electrically connected to an external power source.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation goaf air leakage detection and spontaneous combustion prevention device for residual coal, comprising a gob-side entry; characterized in that: Sulfur hexafluoride gas is released in the corner area of ​​the gob-side entry lane, and several fire prevention monitoring points are set up in the gob-side entry lane. ​ Fire detection points include a gas intake assembly, a temperature measurement assembly, and a liquid nitrogen output assembly; The protective component is fitted outside the gas intake component, temperature measurement component and liquid nitrogen output component; the top of the protective component is equipped with a controller (70) and an audible and visual alarm (71).

2. The air leakage detection and spontaneous combustion prevention device for a ventilation and air extraction area according to claim 1, characterized in that: The protective assembly includes a flower tube (40) and an iron bundle tube (50). The bottom of the flower tube (40) is connected to the top of the iron bundle tube (50). Handles (60) are symmetrically arranged on the outer surface of the flower tube (40). Screws (61) are connected to the handles (60). A controller (70) and an audible and visual alarm (71) are arranged on the top of the flower tube (40).

3. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 2, characterized in that: The bottom of the flower tube (40) is provided with polyurethane (41), and the bottom of the iron bundle tube (50) is provided with quick-drying cement (51). Both the polyurethane (41) and the quick-drying cement (51) are wrapped around the outer surface of the gas intake component, the temperature measurement component and the liquid nitrogen output component.

4. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 3, characterized in that: The gas sampling assembly includes a gas sampling tube (10), one end of which is connected to an automatic negative pressure gas sampler (11), the automatic negative pressure gas sampler (11) is connected to an airbag (12), the other end of which is connected to a gas sampling probe (14), the gas sampling probe (14) has a gas sampling hole, and a solenoid valve (13) is provided on the gas sampling tube (10) near the gas sampling probe (14).

5. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 4, characterized in that: The outer surface of the gas sampling probe (14) is provided with an iron sand mesh (15), and the iron sand mesh (15) is bound and wrapped around the outer surface of the gas sampling probe (14) by a cable tie (16).

6. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 5, characterized in that: The temperature measurement component is a temperature sensor, which includes a temperature sensor dial (20), a wire (21), and a temperature probe (22). The bottom of the temperature probe (22) is flush with the bottom of the gas sampling probe (14).

7. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 6, characterized in that: The conductor (21) and the temperature probe (22) are both covered by a copper tube (23).

8. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 7, characterized in that: The copper tube (23) is filled with sealant (24), which is wrapped around the outer surface of the wire (21).

9. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 8, characterized in that: The liquid nitrogen output assembly includes a liquid nitrogen tube (30), which is connected to a valve (31) and a liquid nitrogen tank (32) for storing liquid nitrogen.

10. The device for detecting air leakage in ventilated goaf areas and preventing spontaneous combustion of residual coal as described in claim 1, characterized in that: Several fire prevention monitoring points are evenly distributed along the runway, with a spacing of 30 to 50 meters between each two fire prevention monitoring points.

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