Intelligent fireproof system for mining coal seam containing hydrogen sulfide

Abstract

The intelligent fire prevention system comprises a four-way pipe, a sealing layer is arranged on the surface of a goaf located on a working face, sealing seats are arranged on the upper corner, the lower corner and the middle of the goaf correspondingly, anchor pipes extending into the goaf are installed on the sealing seats, air holes are formed in the pipe walls of the anchor pipes, and the air holes are communicated with the four-way pipe. A cleaning assembly is installed in a pipe cavity of the anchor pipe, pipe openings of the four-way pipe are connected with a first valve, a second valve, a third valve and a fourth valve respectively, the first valve is further connected with the anchor pipe at the upper corner, the second valve is further connected with a nitrogen supply device, the third valve is further connected with the anchor pipe at the lower corner, the fourth valve is further connected with a positive and negative draught fan, and the positive and negative draught fan is further connected with a dust removal tank. The dedusting tank is further connected with an anchor pipe in the middle of the goaf.

Description

Technical Field

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

[0002] In the process of coal mining, especially for coal seams containing harmful gases such as hydrogen sulfide, fire prevention and explosion safety have always been important precautions in coal mine production. Among them, the problem of spontaneous combustion of coal in the goaf of the working face is particularly prominent. At present, coal mine fire prevention technology mainly relies on traditional methods such as grouting, inhibitor injection, and nitrogen injection. However, there are some problems in the application of existing nitrogen injection technology. With the continuous injection of nitrogen, the air pressure in the goaf gradually increases. The high-pressure environment makes the subsequent nitrogen injection difficult. Cracks often occur in the upper corners of the goaf due to roof collapse and other reasons. When the pressure in the goaf is too high, harmful gases (such as gas, hydrogen sulfide, etc.) and inert gases will escape into the working area through these cracks under the action of high pressure, seriously threatening the safety and health of construction workers.

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

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent fire prevention system for exploiting coal seams containing hydrogen sulfide, comprising a four-way pipe, a sealing layer is provided on the surface of the goaf at the working face, sealing seats are respectively provided at the upper corner, the lower corner and the middle of the goaf, anchor pipes extending into the goaf are installed on the sealing seats, air holes are provided on the anchor pipe walls, and a cleaning assembly is installed in the anchor pipe cavity, each pipe opening of the four-way pipe is respectively connected to valve one, valve two, valve three and valve four, 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 positive and negative fans, the positive and negative fans are 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 mounted on the inner cylinder wall of the retaining cylinder, annular sleeves are respectively mounted at both ends of the inner cylinder tube, radial through holes are arranged on the annular walls of the annular sleeves, a brush head is mounted in the through holes, and drainage blades are mounted 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 slidably connected to the guide rail is provided on the outer wall of the retaining tube.

[0008] Furthermore, combing bars are arranged 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 suction 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 coal seam mining containing hydrogen sulfide, which has the following beneficial effects:

[0015] In the present invention, a sealing layer with sealing coverage is formed by spraying on the surface of the goaf at the working face to avoid air leakage in the upper corner and the lower corner area, prevent air from entering the goaf, provide oxygen, and cause the floating coal and the residual coal in the goaf to burn. Then, anchor pipes are respectively arranged at the upper corner, the lower corner and the 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 the positive and reverse fans are used to control the nitrogen so that the nitrogen is filled into the goaf, and the flammable gas, air and coal dust left in the goaf are driven out to the outside, so as to prevent 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, ensure that the distributed pores on the anchor pipe can be evenly connected with 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 the flammable gas from the goaf in time, remove the flammable coal dust, remove the flammable and toxic hydrogen sulfide, and perform intelligent fire prevention on the goaf. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic structural diagram of the nitrogen supply device of the present invention;

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

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

[0022] Figure 5 It 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 fans; 8. dust removal tank; 9. cleaning component; 31. air hole; 32. guide rail; 33. combing grid; 34. retaining cylinder; 35. slide; 36. friction pad; 61. valve one; 62. valve two; 63. valve three; 64. valve four; 81. dust suction net 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 Figure 1-Figure 6The present invention provides a technical solution: an intelligent fire prevention system for coal seam containing hydrogen sulfide, comprising a four-way pipe 6, a sealing layer 2 is provided on the surface of the goaf at the working face, and sealing seats 4 are respectively provided at the upper corner, the lower corner and the middle of the goaf, and 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, and a cleaning component 9 is installed in the cavity of the anchor pipe 3, and each pipe port of the four-way pipe 6 is respectively connected to a valve 1 61, a valve 2 62, a valve 3 63 and a valve 4 64 , 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 goaf surface at the working face is sprayed to form a sealing layer 2 covered with a seal to avoid air leakage in the upper and lower corners, prevent air from entering the goaf, provide oxygen, and cause the goaf 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, and the pipe wall of the anchor pipe 3 is densely distributed with pores 31, which are used to conduct the gaps and voids formed by the collapse of the goaf, and nitrogen is supplied to the anchor pipe 3 through the nitrogen supply device 5, and the positive and negative blowers 7 are regulated to make the nitrogen fill into the goaf, drive the flammable gas, air and coal dust left in the goaf to the outside, and prevent the goaf from fire; the pores 3 can be cleaned by the cleaning component 9 1. Clean the air holes 31 in time to keep them unobstructed and avoid blockage of the air holes 31. Ensure that the distributed air holes 31 on the anchor pipe 3 can be evenly connected with the inside 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 component 9 includes a retaining cylinder 34, an inner cylinder tube 91 is rotatably installed on the inner cylinder wall of the retaining cylinder 34, and 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 blade 92; specifically, through the provision of the drainage blade 92, the gas passes through the drainage blade 92, which can drive the inner cylinder tube 91 to rotate, thereby driving the ring sleeve 93 to rotate, wherein, in the process of the gas passing through the drainage 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, in the process of continuous sweeping by the brush head 95, the floating of coal dust can be promoted, so that the coal dust floats in the airflow 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 , so as to enhance the effect of the brush head 95 on sweeping and cleaning the air hole 31 , thereby ensuring 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 slidably connected to the guide rail 32 is provided on the outer wall of the retaining tube 34 .

[0029] In this embodiment, combing bars 33 are arranged at intervals on the guide rail 32, and 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, and the combing bars 33 can comb the brush bars of the brush head 95, which is beneficial to maintain 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 positive and negative fans 7, and the states of the retaining cylinder 34 include a continuously moving state and a static 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 arranged at intervals 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 of hydrogen sulfide removal by the alkaline wet cotton layer 82 .

[0033] In this embodiment, an exhaust valve 85 connected to the dust removal tank 8 is provided between the dust absorption net layers 81 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 the high-concentration gas circulation flow is discharged in time in cooperation with the exhaust valve 85. At the same time, nitrogen is replenished by the nitrogen replenishing 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, when 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 for sealing coverage;

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

[0038] S3: The goaf is inflated by the cooperation of the nitrogen supply device 5 and the positive and negative 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 positive and negative 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 positive and negative fans 7 regulate the airflow to the anchor pipes 3 at the upper and lower corners to fill 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 implementation manner of the invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the invention, which should be covered by the protection scope of the present invention.

Claims

1. An intelligent fire prevention system for coal seam mining 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 the anchor pipe (3) is provided with an air hole (31) 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.

2. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 1, characterized in that: The cleaning assembly (9) comprises a retaining cylinder (34), an inner cylinder tube (91) being rotatably mounted on the inner cylinder wall of the retaining cylinder (34), annular sleeves (93) being mounted at both ends of the inner cylinder tube (91), a radial through hole (94) being provided on the annular wall of the annular sleeve (93), a brush head (95) being mounted in the through hole (94), and a drainage fan blade (92) being mounted on the inner cylinder wall of the inner cylinder tube (91).

3. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 2 is 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).

4. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 2, characterized in that: An axial guide rail (32) is installed on the inner wall of the anchor tube (3), and a sliding groove (35) slidably connected to the guide rail (32) is provided on the outer wall of the retaining tube (34).

5. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 4, characterized in that: Combing bars (33) are arranged at intervals on the guide rail (32), and the combing bars (33) are used for combing the brush head (95).

6. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 2, characterized in that: The outer wall of the retaining cylinder (34) is also provided with a friction pad (36).

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

8. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 7, characterized in that: The alkaline wet cotton layer (82) is connected to a pH monitor (86).

9. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide according to claim 7, characterized in that: An exhaust valve (85) connected to the tank cavity of the dust removal tank (8) is provided between the dust absorption net layers (81).

10. The intelligent fire prevention system for coal seam mining containing hydrogen sulfide 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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