An intelligent fire prevention system for mining coal seams containing hydrogen sulfide

Abstract

The present invention discloses an intelligent fire prevention system for mining hydrogen sulfide-containing coal seams, comprising a four-way pipe, a sealing layer being provided on the surface of the goaf at the working face, sealing seats being provided at the upper corner, the lower corner and the middle of the goaf respectively, anchor pipes extending into the goaf being installed on the sealing seats, air holes being provided on the anchor pipe walls, and a cleaning assembly being installed in the anchor pipe cavities, the pipe openings of the four-way pipe being respectively connected to valve one, valve two, valve three and valve four, valve one being also connected to the anchor pipe at the upper corner, valve two being also connected to a nitrogen supply device, valve three being also connected to the anchor pipe at the lower corner, valve four being also connected to positive and negative fans, the positive and negative fans being also connected to a dust removal tank, and the dust removal tank being also connected to the anchor pipe in the middle of the goaf.

Description

Technical Field

[0001] The present invention relates to the technical field of fire prevention and cooling in underground coal mines, in particular to an intelligent fire prevention system used in mining coal seams containing hydrogen sulfide. Background Art

[0002] During coal mining, fire prevention and explosion safety have always been crucial considerations, especially for coal seams containing harmful gases such as hydrogen sulfide. The spontaneous combustion of residual coal in the goaf of the working face is particularly prominent. Currently, coal mine fire prevention technologies primarily rely on traditional methods such as grouting, inhibitor injection, and nitrogen injection. However, existing nitrogen injection technologies present several challenges. With the continuous injection of nitrogen, the air pressure within the goaf gradually increases. This high-pressure environment makes subsequent nitrogen injection difficult, and cracks often form in the upper corners of the goaf due to roof collapse and other factors. When the goaf pressure is too high, harmful gases (such as gas and hydrogen sulfide) and inert gases can escape into the work area through these cracks under the action of high pressure, posing a serious threat to the safety and health of construction workers.

[0003] Therefore, it is necessary to provide an intelligent fire prevention system for mining hydrogen sulfide-containing coal seams to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an intelligent fire prevention system for the mining of hydrogen sulfide-containing coal seams, comprising a four-way pipe, a sealing layer being provided on the surface of the goaf at the working face, and sealing seats being provided at the upper corner, the lower corner and the middle of the goaf respectively, an anchor pipe extending into the goaf being installed on the sealing seat, an air hole being provided on the anchor pipe wall, and a cleaning assembly being installed in the anchor pipe cavity, each pipe mouth of the four-way pipe being connected to valve one, valve two, valve three and valve four respectively, valve one is also connected to the anchor pipe at the upper corner, valve two is also connected to a nitrogen supply device, valve three is also connected to the anchor pipe at the lower corner, valve four is also connected to a positive and negative fan, the positive and negative fan is also connected to a dust removal tank, and the dust removal tank is also connected to the anchor pipe in the middle of the goaf.

[0005] Furthermore, the cleaning assembly includes a retaining cylinder, an inner cylinder tube is rotatably installed on the inner cylinder wall of the retaining cylinder, an annular sleeve is installed at both ends of the inner cylinder tube, the annular sleeve wall is provided with a radial through hole, a brush head is installed in the through hole, and a drainage fan blade is installed on the inner cylinder wall of the inner cylinder tube.

[0006] Furthermore, the brush head is connected to the bottom of the through hole via a spring, and the brush head is slidably connected to the wall of the through hole.

[0007] Furthermore, an axial guide rail is installed on the inner wall of the anchor tube, and a sliding groove is provided on the outer wall of the retaining tube for sliding connection with the guide rail.

[0008] Furthermore, combing bars are provided at intervals on the guide rail, and the combing bars are used for combing the brush head.

[0009] Furthermore, a friction pad is provided on the outer wall of the retaining cylinder.

[0010] Furthermore, dust-absorbing mesh layers are respectively provided at the upper and lower tank openings of the dust removal tank cavity, and alkaline wet cotton layers are provided at intervals between the dust-absorbing mesh layers.

[0011] Furthermore, the alkaline wet cotton layer is connected to a pH monitor.

[0012] Furthermore, an exhaust valve connected to the dust removal tank cavity is provided between the dust collection net layers.

[0013] Furthermore, a gas sensor and a dust particle sensor are provided at the upper and lower tank openings of the dust removal tank.

[0014] Compared with the prior art, the present invention provides an intelligent fire prevention system for mining hydrogen sulfide-containing coal seams, which has the following beneficial effects:

[0015] In the present invention, a sealing layer with a sealing cover is formed by spraying on the surface of the goaf at the working face to avoid air leakage in the upper corner and lower corner areas, prevent air from entering the goaf, provide oxygen, and cause the floating coal and residual coal in the goaf to burn. Anchor pipes are then set at the upper corner, lower corner and middle area of ​​the goaf to conduct the gaps and voids formed by the collapse of the goaf. Nitrogen is supplied to the anchor pipes through a nitrogen supply device and regulated by positive and reverse fans so that nitrogen is filled into the goaf, driving the flammable gas, air and coal dust left in the goaf to the outside, thereby preventing the goaf from fire.

[0016] The present invention can also clean the pores in time through the cleaning component, keep the pores unobstructed, avoid clogging of the pores, and ensure that the distributed pores on the anchor pipe can be evenly connected to the interior of the goaf, which is beneficial to the diversion and discharge of air, coal dust and gas inside the goaf.

[0017] The present invention also processes the circulating airflow through a dust removal tank so as to discharge flammable gas from the goaf in time, remove flammable coal dust, remove flammable and toxic hydrogen sulfide, and perform intelligent fire prevention on the goaf. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the intelligent fire protection system of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the nitrogen supply device of the present invention;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the anchor pipe of the present invention;

[0021] Figure 4 This is a schematic structural diagram of the cleaning component of the present invention;

[0022] Figure 5 This is a schematic cross-sectional view of the cleaning component of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the dust removal tank of the present invention;

[0024] In the figure: 1. Goaf; 2. Sealing layer; 3. Anchor pipe; 4. Sealing seat; 5. Nitrogen supply device; 6. Four-way pipe; 7. Forward and reverse blower; 8. Dust removal tank; 9. Cleaning component; 31. Air hole; 32. Guide rail; 33. Combing grid; 34. Stop cylinder; 35. Slide; 36. Friction pad; 61. Valve one; 62. Valve two; 63. Valve three; 64. Valve four; 81. Dust collection mesh layer; 82. Alkaline wet cotton layer; 83. Gas sensor; 84. Dust particle sensor; 85. Exhaust valve; pH monitor; 91. Inner tube; 92. Drainage fan blade; 93. Ring sleeve; 94. Through hole; 95. Brush head; 96. Spring. DETAILED DESCRIPTION

[0025] Reference Figures 1-6The present invention provides a technical solution: an intelligent fire prevention system for mining hydrogen sulfide-containing coal seams, comprising a four-way pipe 6, a sealing layer 2 provided on the surface of the goaf at the working face, a sealing seat 4 provided at the upper corner, the lower corner, and the middle of the goaf, an anchor pipe 3 extending into the goaf is installed on the sealing seat 4, an air hole 31 is provided on the wall of the anchor pipe 3, a cleaning component 9 is installed in the lumen of the anchor pipe 3, and each pipe port of the four-way pipe 6 is connected to valve 1 61, valve 2 62, valve 3 63, and valve 4 64 respectively. , valve 1 61 is also connected to the anchor pipe 3 at the upper corner, valve 2 62 is also connected to the nitrogen supply device 5, valve 3 63 is also connected to the anchor pipe 3 at the lower corner, valve 4 64 is also connected to the positive and negative blower 7, the positive and negative blower 7 is also connected to the dust removal tank 8, and the dust removal tank 8 is also connected to the anchor pipe 3 in the middle of the goaf; specifically, the surface of the goaf at the working face is sprayed to form a sealing layer 2 that is sealed and covered to avoid air leakage in the upper and lower corner areas, prevent air from entering the goaf, provide oxygen, and cause the goaf to leak. Floating coal and residual coal combustion; Anchor pipes 3 are respectively arranged at the upper corner, the lower corner and the middle area of ​​the goaf. The wall of the anchor pipe 3 is densely distributed with air holes 31, which are used to conduct the gaps and voids formed by the collapse of the goaf. Nitrogen is supplied to the anchor pipe 3 through the nitrogen supply device 5. The forward and reverse blowers 7 are used to control the nitrogen to be filled into the goaf, driving the flammable gas, air and coal dust left in the goaf to the outside, thereby preventing the goaf from fire; the air holes 3 can be cleaned by the cleaning component 9. 1. Clean the air holes 31 in time to keep them unobstructed and avoid clogging of the air holes 31. Ensure that the air holes 31 distributed on the anchor pipe 3 can be evenly connected to the interior of the goaf, which is beneficial to the drainage of air, coal dust and gas inside the goaf. The circulating airflow is processed by the dust removal tank 8 so as to timely discharge the flammable gas from the goaf, remove the flammable coal dust, and remove the flammable and toxic hydrogen sulfide to prevent fire inside the goaf.

[0026] In this embodiment, the cleaning assembly 9 includes a retaining cylinder 34, and an inner cylinder tube 91 is rotatably installed on the inner cylinder wall of the retaining cylinder 34. Ring sleeves 93 are respectively installed at both ends of the inner cylinder tube 91. The ring sleeve 93 has a radial through hole 94 on the ring wall, and a brush head 95 is installed in the through hole 94. The inner cylinder wall of the inner cylinder tube 91 is installed with a drainage fan blade 92; specifically, through the setting of the drainage fan blade 92, the gas passes through the drainage fan blade 92, which can drive the inner cylinder tube 91 to rotate, thereby driving the ring sleeve 93 to rotate. In the process of the gas passing through the drainage fan blade 92, the gas has a thrust effect on the inner cylinder tube 91, thereby driving the retaining cylinder 34 to move in the anchor pipe 3, so that the brush head 95 can thoroughly sweep the air hole 31; in addition, during the continuous sweeping process of the brush head 95, the floating of coal dust can be promoted, so that the coal dust floats in the air flow and flows in the anchor pipe 3, which is conducive to discharge from the inside of the goaf.

[0027] In this embodiment, the brush head 95 is connected to the bottom of the through hole 94 via a spring 96, and the brush head 95 is slidably connected to the wall of the through hole 94 to enhance the cleaning effect of the brush head 95 on the air hole 31 and ensure the patency of the air hole 31.

[0028] In this embodiment, an axial guide rail 32 is installed on the inner wall of the anchor tube 3 , and a sliding groove 35 is provided on the outer wall of the retaining tube 34 to be slidably connected to the guide rail 32 .

[0029] In this embodiment, combing bars 33 are arranged at intervals on the guide rail 32. The combing bars 33 are used to comb the brush head 95, so that when the brush head 95 touches the combing bars 33, the brush head 95 and the combing bars 33 can interact with each other, and the brush head 95 can clean and keep the combing bars 33 tidy. The combing bars 33 can comb the brush bars of the brush head 95, which is conducive to maintaining the cleaning effect of the brush head 95.

[0030] In this embodiment, the outer wall of the retaining cylinder 34 is also provided with a friction pad 36, so that the retaining cylinder 34 and the inner wall of the anchor pipe 3 have a certain friction and static effect, so that the retaining cylinder 34 can stay at any position of the inner wall of the anchor pipe 3. That is to say, due to the uneven distribution of gaps and voids inside the goaf, the position of the retaining cylinder 34 in the anchor pipe 3 can be controlled by increasing the power and changing the direction of the forward and reverse fans 7, and the states of the retaining cylinder 34 include a continuously moving state and a stationary state.

[0031] In this embodiment, dust-absorbing mesh layers 81 are respectively provided at the upper and lower tank openings of the dust removal tank 8, and alkaline wet cotton layers 82 are spaced apart between the dust-absorbing mesh layers 81. The dust-absorbing mesh layers 81 are used to adhere to coal dust, and the alkaline wet cotton layers 82 are used to react with hydrogen sulfide to remove hydrogen sulfide.

[0032] In this embodiment, the alkaline wet cotton layer 82 is connected to a pH monitor 86 so as to timely understand the degree to which the alkaline wet cotton layer 82 removes hydrogen sulfide.

[0033] In this embodiment, an exhaust valve 85 connected to the dust removal tank 8 cavity is provided between the dust collection net layers 81 so as to discharge the gas in time, increase the nitrogen content in the gaps and voids inside the goaf, and prevent fire in the goaf.

[0034] In this embodiment, a gas sensor 83 and a dust particle sensor 84 are provided at the upper and lower tank openings of the dust removal tank 8. The gas concentration in the gas is monitored by the gas sensor 83, and the gas containing high-concentration gas circulation is discharged in time in conjunction with the exhaust valve 85. At the same time, nitrogen is supplied by the nitrogen supply device 5, and the coal dust particles in the gas are monitored and judged by the dust particle sensor 84 so as to replace the dust removal tank 8. It should be noted that when the retaining cylinder 34 is in a continuous moving state, the lumen pressure on one side of the anchor pipe 3 that pushes the retaining cylinder 34 to move is greater than the lumen pressure on one side of the anchor pipe 3 that the retaining cylinder 34 moves toward. force, that is to say, if the anchor pipe 3 is in the process of filling gas into the goaf, the anchor pipe 3 on the side with greater pressure will have a stronger effect on driving out the gas inside the corresponding goaf. At this time, in the process of monitoring the gas concentration in the circulating gas with the gas sensor 83, if the monitoring value of the gas sensor 83 increases, it indicates that the gas concentration in the area passed by the retaining cylinder 34 is relatively high. At this time, the retaining cylinder 34 is still moving. When the monitoring value of the gas sensor 83 increases to the maximum value, the retaining cylinder 34 is adjusted to be in a stationary state so as to leave sufficient time to drive out the local high-concentration gas in the goaf and perform intelligent fire prevention treatment.

[0035] In specific implementation, it includes the following steps:

[0036] S1: Shotcrete is sprayed on the surface of the goaf at the working face to form a sealing layer 2;

[0037] S2: Anchor pipes 3 are respectively installed at the upper corner, the lower corner and the middle area of ​​the goaf;

[0038] S3: The goaf is inflated through the cooperation of the nitrogen supply device 5 and the forward and reverse blowers 7. Specifically, valve 2 62, valve 3 63, valve 4 64 and regulating valve 1 61 are opened. The nitrogen supply device 5 supplies nitrogen, and the forward and reverse blowers 7 drive the gas flow. When the nitrogen is replenished to a certain level, valve 1 61 is closed. When nitrogen needs to be replenished, valve 1 61 is opened again.

[0039] S4: Processing the gas inside the goaf. Initially, the forward and reverse fans 7 control the airflow to the anchor pipes 3 at the upper and lower corners, thereby filling the goaf. The anchor pipes 3 in the middle of the goaf have a suction effect on the gas inside the goaf.

[0040] S4: When cleaning the anchor pipe 3, the forward and reverse blower 7 is started back and forth, so that the cleaning assembly 9 moves back and forth inside the anchor pipe 3 to clean the anchor pipe 3.

[0041] The above description is only a preferred specific embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An intelligent fire prevention system for mining coal seams containing hydrogen sulfide, comprising a four-way pipe (6), characterized in that: A sealing layer (2) is provided on the surface of the goaf at the working face, and sealing seats (4) are provided at the upper corner, the lower corner and the middle of the goaf respectively. An anchor pipe (3) extending into the goaf is installed on the sealing seat (4), and an air hole (31) is provided on the wall of the anchor pipe (3). A cleaning component (9) is installed in the cavity of the anchor pipe (3). The pipe openings of the four-way pipe (6) are respectively connected to valve one (61), valve two (62), valve three (63) and valve four (64). Valve one (61) is also connected to the anchor pipe (3) at the upper corner, valve two (62) is also connected to a nitrogen supply device (5), valve three (63) is also connected to the anchor pipe (3) at the lower corner, valve four (64) is also connected to a positive and negative blower (7), the positive and negative blower (7) is also connected to a dust removal tank (8), and the dust removal tank (8) is also connected to the anchor pipe (3) in the middle of the goaf; The cleaning assembly (9) comprises a retaining cylinder (34), an inner cylinder tube (91) is rotatably mounted on the inner cylinder wall of the retaining cylinder (34), an annular sleeve (93) is mounted on both ends of the inner cylinder tube (91), a radial through hole (94) is provided on the annular wall of the annular sleeve (93), a brush head (95) is mounted in the through hole (94), and a drainage fan blade (92) is mounted on the inner cylinder wall of the inner cylinder tube (91); An axial guide rail (32) is installed on the inner wall of the anchor tube (3), and a sliding groove (35) is provided on the outer wall of the retaining tube (34) in sliding connection with the guide rail (32); Combing bars (33) are provided at intervals on the guide rail (32), and the combing bars (33) are used for combing the brush head (95); The outer wall of the retaining cylinder (34) is further provided with a friction pad (36).

2. The intelligent fire prevention system for mining hydrogen sulfide-containing coal seams according to claim 1, characterized in that: The brush head (95) is connected to the bottom of the through hole (94) via a spring (96), and the brush head (95) is slidably connected to the wall of the through hole (94).

3. The intelligent fire prevention system for mining hydrogen sulfide-containing coal seams according to claim 1, characterized in that: Dust-absorbing net layers (81) are respectively provided at the upper and lower openings of the dust-removing tank (8), and alkaline wet cotton layers (82) are provided at intervals between the dust-absorbing net layers (81).

4. The intelligent fire prevention system for mining hydrogen sulfide-containing coal seams according to claim 3, characterized in that: The alkaline wet cotton layer (82) is connected to a pH monitor (86).

5. The intelligent fire prevention system for mining hydrogen sulfide-containing coal seams according to claim 3, characterized in that: An exhaust valve (85) connected to the tank cavity of the dust removal tank (8) is provided between the dust suction net layers (81).

6. The intelligent fire prevention system for mining hydrogen sulfide-containing coal seams according to claim 1, characterized in that: A gas sensor (83) and a dust particle sensor (84) are provided at the upper and lower tank openings of the dust removal tank (8).

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