Safe fire extinguishing device for preventing spontaneous combustion of residual coal in goaf

Abstract

The invention relates to the technical field of coal mine goaf fire extinguishing, in particular to a safe fire extinguishing device for preventing spontaneous combustion of residual coal in a goaf, the safe fire extinguishing device comprises a transverse plate, a gas storage tank and a reservoir, the inner side of the transverse plate is provided with a suspension type flame retardant structure, and one side of the gas storage tank is communicated with an inert gas conveying structure; and a grouting type fire extinguishing structure is arranged at one end of the reservoir. According to the safe fire extinguishing device for preventing spontaneous combustion of the residual coal in the goaf, the storage guide pipe is made of a high-strength flame-retardant material, the inner wall is smooth so as to reduce gas flow resistance and ensure uniform release of gas, the suspension rod is made of a high-strength alloy steel material, and the supporting plate and the suspension rod at the lower end are integrally and firmly anchored to a stable rock stratum at the top of the goaf through the anchoring bolt; the storage guide pipe is arranged at the top of the goaf through the suspension type flame-retardant structure, natural diffusion from top to bottom is achieved by means of the characteristic that the density of inert gas is larger than that of air, the whole goaf can be evenly paved in a short time, and the problem that gas flow is limited is solved.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing technology in coal mine goaf areas, specifically a safety fire extinguishing device to prevent spontaneous combustion of residual coal in goaf areas. Background Technology

[0002] Because of the need to extract and transport underground coal resources during the mining process, a method similar to tunneling through mountains is generally used during the tunneling process to gradually open up the tunnel between the underground coal location and the coal mine entrance, so as to transport the ore and coal encountered during the mining process to the surface, in order to form a reasonable transportation and mining operation face. As coal and other ores are continuously transported out, coal goaf areas are formed underground.

[0003] For example, the authorization announcement number "CN215025481U" describes a safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas. This device uses a bidirectional air intake duct to replenish gas to a storage duct deep within the goaf, ensuring nitrogen flow in both directions and guaranteeing the delivery of the temperature-sensitive sphere. However, existing safety fire extinguishing devices for preventing spontaneous combustion of residual coal in goaf areas have storage ducts containing inert gas evenly distributed within the goaf. Since the storage ducts are located relatively close to the ground, and because inert gas is heavier than air, its movement is from top to bottom. Therefore, the space for the flame-retardant inert gas to flow at lower locations is limited, preventing it from quickly covering the spontaneously combusting coal layer and hindering fire extinguishing efficiency.

[0004] Meanwhile, existing safety fire extinguishing devices for preventing spontaneous combustion of coal residue in goaf areas only use a single inert gas flame retardant method to extinguish spontaneous combustion of coal residue in goaf areas. Once the fire is relatively fierce, the coal will burn rapidly when it encounters an open flame, and relying solely on the flame retardant structure is no longer sufficient to control the spread of the fire, which will lead to the fire becoming more and more serious. Summary of the Invention

[0005] This invention addresses the problem that existing safety fire extinguishing devices for preventing spontaneous combustion of coal residue in goaf areas have inert gas that moves from top to bottom. As a result, the space for the flow of flame-retardant inert gas is limited when the device is placed at a low location, and it cannot cover the spontaneously combusting coal layer in a short time. This hinders the fire extinguishing efficiency, and the flame-retardant structure alone is no longer sufficient to control the spread of the fire, leading to an increasingly serious fire. Therefore, this invention proposes a safety fire extinguishing device for preventing spontaneous combustion of coal residue in goaf areas.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] Design a safety fire extinguishing device to prevent spontaneous combustion of residual coal in goaf areas, including a horizontal plate, a gas storage tank and a water storage tank. The inner side of the horizontal plate is provided with a suspended flame-retardant structure, one side of the gas storage tank is connected to an inert gas conveying structure, and one end of the water storage tank is provided with a grouting fire extinguishing structure.

[0008] Preferably, the suspended flame-retardant structure includes support rings and suspension rods. Multiple support rings are fixedly connected to the bottom end of the horizontal plate. Multiple storage conduits are fixedly connected to the inner side of the support rings. Multiple suspension rods are fixedly connected to the top end of the horizontal plate. A support plate is fixedly connected to the top end of the multiple suspension rods. An anchor bolt is fixedly installed above the support plate.

[0009] In this setup, the support rings are evenly distributed and parallel, and are fixedly connected to the bottom of the horizontal plate for multi-point fixation of the storage conduit. Multiple storage conduits are evenly fixedly connected to the inner side of the support rings along the circumference. The storage conduits are made of high-strength flame-retardant material with smooth inner walls to reduce gas flow resistance and ensure uniform gas release. The suspension rods are made of high-strength alloy steel with good load-bearing capacity. The support plate and the lower suspension rods are firmly anchored to the stable rock layer at the top of the goaf by anchor bolts, achieving a suspended layout and avoiding the pipeline from being close to the ground and affecting gas diffusion.

[0010] Preferably, the inert gas delivery structure includes a control pump and temperature sensors. The control pump is fixedly installed on one side of the gas storage tank, and the other end of the control pump is fixedly connected to a connecting pipe. Multiple temperature sensors are fixedly connected to the outer wall of the support ring. The other end of the connecting pipe is connected to the storage conduit. Multiple electric control valves are fixedly connected to the lower ends of the outer walls of the multiple storage conduits, and nozzles are fixedly connected to the bottom ends of the multiple electric control valves.

[0011] This setup features a variable frequency drive (VFD) pump that adjusts gas delivery pressure and flow rate according to the severity of the fire, ensuring stable extraction of inert gas from the storage tank. The connecting pipe uses a wear-resistant, sealed design to guarantee leak-free gas delivery. Multiple temperature sensors are evenly and fixedly connected to the outer wall of the support ring, employing a mine-grade explosion-proof design for high interference resistance and detection accuracy. These sensors monitor temperature changes in different areas of the goaf in real time. Electrically connected electronic valves and temperature sensors via signal lines automatically open or close based on temperature data, enabling precise zoned fire suppression. The nozzles feature a scattering design to effectively expand gas coverage and improve inert gas diffusion efficiency.

[0012] Preferably, the grouting fire extinguishing structure includes a connecting bracket and a water supply pipe. The water supply pipe is connected to a water storage tank via a pump. The other end of the water supply pipe is fixedly connected to a laying pipe, which is fixedly sleeved on the inner side of multiple connecting brackets.

[0013] In this setup, the water supply pipe is connected to the water storage tank via a high-pressure pump. The high-pressure pump has the characteristics of high flow rate and high pressure output. The pipe is laid horizontally and fixedly sleeved on the inside of multiple connecting brackets. The connecting brackets are laid vertically and fixedly connected to the lower end of the support ring by welding. The pipe and the storage conduit are distributed in parallel to ensure that the area covered by the extinguishing medium corresponds to the area covered by the inert gas.

[0014] Preferably, the top ends of the plurality of connecting brackets are fixedly connected to the lower end of the support ring.

[0015] Preferably, a grouting pipe protection structure is provided below the laying pipe. The grouting pipe protection structure includes grouting pipes and inclined rods. Multiple grouting pipes are fixedly connected to the bottom of the laying pipe. Clamping plates are fixedly sleeved on the outer walls of the multiple grouting pipes. Reinforcing sleeves are fixedly connected to the inner walls of two clamping plates. Two inclined rods are fixedly connected to both sides of the outer walls of the clamping plates.

[0016] In this setup, multiple grouting pipes are fixedly connected below the laying pipe. Two clamps are symmetrically arranged, and the reinforcing sleeve is made of wear-resistant rubber, which has both buffering and protective functions, reducing the impact of gravel on the grouting pipes. Two inclined rods are symmetrically inclined and are made of high-strength threaded steel, which is connected to the coal seam in the goaf, providing stable support for the grouting pipes and preventing pipeline displacement and damage caused by the collapse of the goaf.

[0017] Preferably, the bottom ends of the plurality of inclined rods are movably connected to the coal seam in the goaf, and the plurality of grouting pipes are distributed parallel to each other at equal intervals.

[0018] The present invention proposes a safety fire extinguishing device to prevent spontaneous combustion of residual coal in goaf areas. Its advantages include: the storage conduit is made of high-strength flame-retardant material with a smooth inner wall to reduce gas flow resistance and ensure uniform gas release; the suspension rod is made of high-strength alloy steel with excellent load-bearing capacity; the support plate and the lower suspension rod are firmly anchored to the stable rock strata at the top of the goaf using anchor bolts, achieving a suspended installation and avoiding the pipeline from being too close to the ground and affecting gas diffusion. By using a suspended flame-retardant structure to install the storage conduit at the top of the goaf, and utilizing the characteristic that inert gas is denser than air, natural diffusion from top to bottom is achieved, allowing for uniform coverage of the entire goaf in a short time, thus solving the problem of restricted gas flow.

[0019] Multiple grouting pipes are fixedly connected below the laying pipe. Two clamps are symmetrically arranged, and the reinforcing sleeve is made of wear-resistant rubber, which has both buffering and protective functions, reducing the impact of gravel on the grouting pipes. Two inclined rods are symmetrically inclined and are made of high-strength threaded steel, which is connected to the coal seam in the goaf, providing stable support for the grouting pipes and preventing pipeline displacement and damage caused by goaf collapse. Combined with inert gas flame retardancy and grouting cooling and fire extinguishing, in the event of a severe fire, the grouting fire extinguishing structure is activated to inject clean water or composite slurry to quickly absorb heat and reduce temperature, effectively controlling the fierce fire. Attached Figure Description

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

[0021] Figure 2for Figure 1 Front sectional view,

[0022] Figure 3 for Figure 1 A side sectional view.

[0023] Figure 4 for Figure 2 Enlarged diagram of part A in the middle.

[0024] Figure 5 for Figure 2 Enlarged diagram of part B in the middle.

[0025] Figure 6 for Figure 2 Enlarged diagram of part C in the middle.

[0026] In the diagram: 1. Horizontal plate, 2. Gas storage tank, 3. Water storage tank, 4. Suspended flame-retardant structure, 41. Support ring, 42. Storage conduit, 43. Suspension rod, 44. Anchor bolt, 45. Support plate, 5. Inert gas delivery structure, 51. Control pump, 52. Connecting pipe, 53. Temperature sensor, 54. Electrically controlled valve, 55. Nozzle, 6. Grouting fire extinguishing structure, 61. Connecting bracket, 62. Laying pipe, 63. Water supply pipe, 7. Grouting pipe protection structure, 71. Grouting pipe, 72. Clamping plate, 73. Reinforcing sleeve, 74. Diagonal rod. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] Example:

[0029] Please see Figure 1-6 In this embodiment, a safety fire extinguishing device for preventing spontaneous combustion of coal residue in goaf areas includes a horizontal plate 1, a gas storage tank 2, and a water storage tank 3. The inner side of the horizontal plate 1 is provided with a suspended flame-retardant structure 4, one side of the gas storage tank 2 is connected to an inert gas conveying structure 5, and one end of the water storage tank 3 is provided with a grouting fire extinguishing structure 6.

[0030] The suspended flame-retardant structure 4 includes support rings 41 and suspension rods 43. Multiple support rings 41 are fixedly connected to the bottom end of the horizontal plate 1. Multiple storage conduits 42 are fixedly connected to the inner side of the support rings 41. Multiple suspension rods 43 are fixedly connected to the top end of the horizontal plate 1. A support plate 45 is fixedly connected to the top end of the multiple suspension rods 43. An anchor bolt 44 is fixedly installed above the support plate 45. The support rings 41 are evenly distributed in parallel and fixedly connected to the bottom end of the horizontal plate 1 for multi-point fixation of the storage conduits 42. Multiple storage conduits 42 are evenly fixedly connected to the inner side of the support rings 41 along the circumferential direction. The storage conduits 42 are made of high-strength flame-retardant material with smooth inner walls to reduce gas flow resistance and ensure uniform gas release. The suspension rods 43 are made of high-strength alloy steel and have good load-bearing capacity. The support plate 45 and the lower suspension rod are firmly anchored to the stable rock layer at the top of the goaf by the anchor bolts 44, realizing the suspended layout and avoiding the pipeline from being close to the ground and affecting gas diffusion.

[0031] The inert gas delivery structure 5 includes a control pump 51 and temperature sensors 53. The control pump 51 is fixedly installed on one side of the gas storage tank 2, and the other end of the control pump 51 is fixedly connected to a connecting pipe 52. Multiple temperature sensors 53 are fixedly connected to the outer wall of the support ring 41. The other end of the connecting pipe 52 is connected to the storage conduit 42. The lower end of the outer wall of the multiple storage conduits 42 is fixedly connected to an electric control valve 54, and the bottom end of the multiple electric control valves 54 is fixedly connected to a nozzle 55. The control pump 51 adopts a frequency conversion control design, which can adjust the gas delivery pressure and flow rate according to the severity of the fire, for stabilizing the gas supply. Inert gas is extracted from the gas storage tank 2. The connecting pipe 52 adopts a wear-resistant and sealed pipeline to ensure that there is no leakage during the gas transportation process. Multiple temperature sensors 53 are evenly fixedly connected to the outer wall of the support ring 41. They adopt a mine explosion-proof design and have the characteristics of anti-interference and high detection accuracy. They are used to monitor the temperature changes in different areas of the goaf in real time. The electric control valve 54 is electrically connected to the temperature sensor 53 through the signal line. It can automatically open or close according to the temperature data to achieve precise zoned fire extinguishing. The nozzle 55 has a scattering design, which can effectively expand the gas coverage area and improve the inert gas diffusion efficiency.

[0032] The grouting fire extinguishing structure 6 includes a connecting bracket 61 and a water supply pipe 63. The water supply pipe 63 is connected to the water storage tank 3 via a pump. The other end of the water supply pipe 62 is fixedly connected to a laying pipe 62. The laying pipe 62 is fixedly sleeved inside multiple connecting brackets 61. The top of multiple connecting brackets 61 is fixedly connected to the lower end of the support ring 41. The water supply pipe 63 is connected to the water storage tank 3 via a high-pressure pump. The high-pressure pump has the characteristics of large flow and high pressure output. The laying pipe 62 is set horizontally and fixedly sleeved inside multiple connecting brackets 61. The connecting brackets 61 are set vertically and fixedly connected to the lower end of the support ring 41 by welding. The laying pipe 62 and the storage conduit 42 are distributed in parallel to ensure that the fire extinguishing medium coverage area corresponds to the inert gas coverage area.

[0033] A grouting pipe protection structure 7 is provided below the laying pipe 62. The grouting pipe protection structure 7 includes grouting pipes 71 and inclined rods 74. Multiple grouting pipes 71 are fixedly connected to the bottom of the laying pipe 62. Clamping plates 72 are fixedly sleeved on the outer walls of the multiple grouting pipes 71. Reinforcing sleeves 73 are fixedly connected to the inner walls of the two clamping plates 72. Two inclined rods 74 are fixedly connected to both sides of the outer walls of the clamping plates 72. The bottom ends of the multiple inclined rods 74 are movably connected to the coal seam in the goaf. The multiple grouting pipes 71 are parallel and equidistant from each other. The two clamping plates 72 are symmetrically arranged. The reinforcing sleeves 73 are made of wear-resistant rubber and have both buffering and protective functions, which can reduce the impact of gravel on the grouting pipes 71. The two inclined rods 74 are symmetrically inclined. The inclined rods 74 are made of high-strength threaded steel and are movably connected to the coal seam in the goaf, which plays a stable supporting role for the grouting pipes 71 and prevents the pipeline from shifting and being damaged due to the collapse of the goaf.

[0034] Working principle:

[0035] A safety fire extinguishing device to prevent spontaneous combustion of residual coal in goaf areas includes a support ring 41 that is equidistantly and parallelly distributed and fixedly connected to the bottom of the horizontal plate 1 for multi-point fixation of the storage conduit 42. Multiple storage conduits 42 are evenly fixedly connected to the inner side of the support ring 41 along the circumferential direction. The storage conduit 42 is made of high-strength flame-retardant material with a smooth inner wall to reduce gas flow resistance and ensure uniform gas release. The suspension rod 43 is made of high-strength alloy steel and has good load-bearing capacity. The support plate 45 and the lower suspension rod are firmly anchored to the stable rock layer at the top of the goaf area by the anchor bolt 44 to achieve a suspended layout and avoid the pipeline from being close to the ground and affecting gas diffusion.

[0036] The control pump 51 adopts a frequency conversion control design, which can adjust the gas delivery pressure and flow rate according to the severity of the fire. It is used to stably extract inert gas from the gas storage tank 2. The connecting pipe 52 adopts a wear-resistant and sealed pipeline to ensure that there is no leakage during the gas delivery process. Multiple temperature sensors 53 are evenly fixedly connected to the outer wall of the support ring 41. They adopt a mine explosion-proof design and have the characteristics of anti-interference and high detection accuracy. They are used to monitor the temperature changes in different areas of the goaf in real time. The electric control valve 54 is electrically connected to the temperature sensor 53 through a signal line. It can automatically open or close according to the temperature data to achieve precise zoned fire extinguishing. The nozzle 55 has a scattering design, which can effectively expand the gas coverage area and improve the inert gas diffusion efficiency.

[0037] Working process: First, temperature sensor 53 monitors the temperature of each area in the goaf in real time and transmits the monitoring data to the external PLC control system in real time. When the temperature rises to the warning value, the system issues a warning signal to remind the staff to pay attention to the status of the goaf and prepare for fire extinguishing.

[0038] Then, when the temperature continues to rise to the initial stage of coal smoldering, the control system automatically opens the electric control valve 54 at the lower end of the corresponding area storage conduit 42 based on the position data of the temperature sensor 53, and at the same time starts the control pump 51 to transport the inert gas in the gas storage tank 2 to the storage conduit 42 through the connecting pipe 52, and then releases it through the nozzle 55. Since the storage conduit 42 is located at the top of the goaf, the inert gas diffuses naturally from top to bottom, quickly fills the goaf, blocks the oxygen supply for the coal oxidation reaction, and achieves flame retardant fire extinguishing.

[0039] When the fire is severe, a single inert gas flame retardant is insufficient to quickly control the fire. At this time, the control system automatically starts the high-pressure pump of the water storage tank 3, and delivers clean water or composite slurry with added inhibitors through the water delivery pipe 63 to the laying pipe 62, and then evenly injects it into the combustion area through the grouting pipe 71. After the slurry comes into contact with the burning coal, it quickly absorbs heat and lowers the temperature. At the same time, the slurry penetrates into the coal cracks, achieving the dual effects of cooling and flame retardancy, effectively controlling the fierce fire. During the grouting process, the reinforcing sleeve 73 and the inclined rod 74 of the grouting pipe protection structure 7 continuously protect the grouting pipe 71 to avoid damage to the pipeline caused by the impact of gravel or collapse.

[0040] During the firefighting process, temperature sensor 53 continuously monitors temperature changes. When the temperature drops to a safe range, the control system gradually shuts off the electric control valve 54 and the high-pressure pump, stopping the delivery of gas and slurry.

[0041] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail may be made within the scope of the claims.

Claims

1. A safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas, comprising a horizontal plate (1), a gas storage tank (2), and a water storage pool (3), characterized in that: The inner side of the horizontal plate (1) is provided with a suspended flame-retardant structure (4), one side of the gas storage tank (2) is connected to an inert gas conveying structure (5), one end of the water storage tank (3) is provided with a grouting fire extinguishing structure (6), the suspended flame-retardant structure (4) includes a support ring (41) and a suspension rod (43), multiple support rings (41) are fixedly connected to the bottom end of the horizontal plate (1), multiple storage conduits (42) are fixedly connected to the inner side of the support ring (41), multiple suspension rods (43) are fixedly connected to the top end of the horizontal plate (1), and a support plate (45) is fixedly connected to the top end of the multiple suspension rods (43), and an anchor bolt (44) is fixedly installed above the support plate (45).

2. The safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas according to claim 1, characterized in that: The inert gas delivery structure (5) includes a control pump (51) and a temperature sensor (53). The control pump (51) is fixedly installed on one side of the gas storage tank (2). The other end of the control pump (51) is fixedly connected to a connecting pipe (52). Multiple temperature sensors (53) are fixedly connected to the outer wall of the support ring (41). The other end of the connecting pipe (52) is connected to the storage conduit (42). Multiple storage conduits (42) are fixedly connected to the lower end of their outer walls with an electric control valve (54). Multiple electric control valves (54) are fixedly connected to the bottom end of their nozzles (55).

3. The safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas according to claim 2, characterized in that: The grouting fire extinguishing structure (6) includes a connecting bracket (61) and a water supply pipe (63). The water supply pipe (63) is connected to the water storage tank (3) through a pump. The other end of the water supply pipe (62) is fixedly connected to a laying pipe (62). The laying pipe (62) is fixedly sleeved on the inside of multiple connecting brackets (61).

4. The safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas according to claim 3, characterized in that: The top ends of the plurality of connecting brackets (61) are fixedly connected to the lower end of the support ring (41).

5. The safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas according to claim 4, characterized in that: The laying pipe (62) is provided with a grouting pipe protection structure (7). The grouting pipe protection structure (7) includes a grouting pipe (71) and a diagonal rod (74). Multiple grouting pipes (71) are fixedly connected to the bottom of the laying pipe (62). The outer walls of the multiple grouting pipes (71) are fixedly sleeved with clamps (72). The inner walls of the two clamps (72) are fixedly connected with reinforcing sleeves (73). The two diagonal rods (74) are fixedly connected to both sides of the outer wall of the clamps (72).

6. The safety fire extinguishing device for preventing spontaneous combustion of residual coal in goaf areas according to claim 5, characterized in that: The bottom ends of the multiple inclined rods (74) are movably connected to the coal seam in the goaf, and the multiple grouting pipes (71) are distributed parallel to each other at equal intervals.

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