Coal mine underground low-permeability coal seam hydrogen sulfide treatment pressure injection equipment and method

Abstract

The application discloses coal mine underground low-permeability coal seam hydrogen sulfide treatment pressure injection equipment, including: crawling mechanism, it is provided with two, and respectively set as first crawling mechanism and second crawling mechanism;Locking mechanism, it is provided with two, and two locking mechanisms between fixedly connected with fixed pipe;High pressure water injection mechanism, it is installed on the middle part side wall of fixed pipe, and is communicated with water supply equipment through high pressure pipe.The application also provides the pressure injection method of coal mine underground low-permeability coal seam hydrogen sulfide treatment pressure injection equipment.The gas concentration detection mechanism of head can monitor the hydrogen sulfide concentration condition of whole hole depth in real time during the drilling process, and accurately locate the hydrogen sulfide enrichment target area;Once the enrichment target area is located, locking and water injection program can be started immediately, realizing the "point removal" of pollution source, avoiding the delay of construction period caused by multiple drilling, and eliminating the target area deviation or gas dispersion problem caused by construction interval.

Description

Technical Field

[0001] This invention relates to the field of hydrogen sulfide treatment technology, specifically to injection equipment and methods for treating hydrogen sulfide in low-permeability coal seams underground in coal mines. Background Technology

[0002] As coal mining in my country extends to deeper areas, hydrogen sulfide gas hazards in coal mines are becoming increasingly prominent. In particular, in some low-permeability coal seams, hydrogen sulfide gas is firmly adsorbed within the micropores of the coal body, making it extremely difficult to control.

[0003] Currently, the mainstream treatment method is to construct injection boreholes and inject neutralizing or oxidizing agent solutions into the coal seam. The traditional process typically involves two separate steps: first, using portable detectors or segmented sampling to roughly determine the hydrogen sulfide concentration within the borehole, and then lowering sealing and grouting equipment for injection. This segmented approach is not only time-consuming and inefficient, but more importantly, the injection operation is highly unpredictable due to the potential for hydrogen sulfide gas to escape or inaccurate concentration distribution assessments. Furthermore, the injection point may not be a hydrogen sulfide enrichment area, resulting in a large amount of reagent being injected into non-target areas, leading to resource waste and unsatisfactory treatment effects, failing to achieve precise targeted removal of high-concentration hydrogen sulfide "target areas." Summary of the Invention

[0004] Therefore, this invention proposes a pressure injection device and method for treating hydrogen sulfide in low-permeability coal seams in underground coal mines, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure injection device for treating hydrogen sulfide in low-permeability coal seams in underground coal mines, comprising: The crawling mechanism has two parts, which are designated as the first crawling mechanism and the second crawling mechanism respectively; The locking mechanism has two parts, and the two locking mechanisms are fixedly connected by a fixed pipe; The high-pressure water injection mechanism is installed on the middle side wall of the fixed pipe and is connected to the water supply equipment through the high-pressure pipe; And a gas concentration detection mechanism, which is installed on the head of the first crawling mechanism; The two locking mechanisms are connected to the first crawling mechanism and the second crawling mechanism via flexible hoses.

[0006] Furthermore, the locking mechanism consists of a pre-support assembly and two expansion joints, wherein the two expansion joints are symmetrically and fixedly connected to the left and right sides of the pre-support assembly.

[0007] Furthermore, the pre-support component includes: The cylindrical shell has multiple sliding grooves arranged in a circular array on its side wall; The number of claw plates is the same as the number of sliding slots, and each claw plate is rotatably mounted in its corresponding sliding slot by means of a pivot pin; A connecting handle is rotatably connected to the rear end of each of the claw plates; And a drive mechanism, which is installed inside the cylinder shell and can drive each claw plate to perform synchronous unfolding or folding actions through a connecting handle.

[0008] Furthermore, the end corner of the front end of the claw plate is set with a right-angled triangular notch.

[0009] Furthermore, the drive mechanism includes: There are two bearing housings, which are symmetrically fixed inside the cylindrical shell; The screw is rotatably mounted between two bearing housings; Nut seat, which is threadedly connected to the threaded section of the screw; The number of pull rods is the same as that of the connecting handles. One end of each pull rod is rotatably connected to the side wall of the nut seat, and the other end of each pull rod is rotatably connected to the corresponding connecting handle. And a waterproof motor, which is fixed inside the cylindrical shell and drives the connecting screw.

[0010] Furthermore, the first crawling mechanism and the second crawling mechanism have the same structure.

[0011] Furthermore, the first crawling mechanism includes: The main body has multiple pusher cylinders arranged in a circular array on its side wall; The number of arc-shaped plates is the same as that of the push cylinders, and each of the arc-shaped plates is driven to be connected to its corresponding push cylinder; And self-driving rollers, with self-driving rollers installed at both the left and right ends of each of the arc-shaped plates.

[0012] Furthermore, a buffer groove is provided on the inner side wall of the arc plate, and the driving end of the push cylinder is slidably connected in the buffer groove. Multiple springs are connected between the driving end of the push cylinder and the bottom of the buffer groove. The driving end of the push cylinder is fixedly connected to one end of the slide column, and the other end of the slide column passes through the arc-shaped plate and is fixedly connected to the baffle.

[0013] On the other hand, the present invention also provides an injection method for the injection equipment used for hydrogen sulfide treatment in low-permeability coal seams in underground coal mines, comprising the following steps: Step 1: In the area of ​​abnormal hydrogen sulfide venting, construct a injection borehole, and then send the assembled injection equipment into the entrance of the target borehole via a traction cable. Step 2: As the injection equipment moves deeper into the borehole, the gas concentration detection mechanism installed at the head of the first crawling mechanism starts to work, monitoring and transmitting back the hydrogen sulfide gas concentration data at different depths in the borehole in real time. Step 3: The control terminal analyzes the data transmitted back by the gas concentration detection agency, accurately locates the "target area" with abnormally high hydrogen sulfide concentration, and then finally docks the equipment at the center of the target area; Step 4: After the claw plates of the pre-support assembly firmly grip the borehole wall, high-pressure liquid is injected into the two expansion joints to cause radial expansion and tightly fit the borehole wall to form a sealed isolation section in the center of the target area. Step 5: The high-pressure water injection mechanism is connected to the water supply equipment through a high-pressure pipe, injecting high-pressure water into the sealed section of the target area isolated by two locking mechanisms. The high-pressure water rapidly increases in pressure within the sealed section, overcoming the pore pressure of the low-permeability coal seam and forcibly penetrating into the micro-fractures and pores of the coal body. The chemical agents carried by the high-pressure water can neutralize or oxidize hydrogen sulfide to generate harmless or low-harm substances, thereby achieving precise treatment of hydrogen sulfide in the target area.

[0014] Compared with existing technologies, the present invention has the following advantages: 1. During the drilling process, the gas concentration detection mechanism at the head of the injection device of the present invention can monitor the hydrogen sulfide concentration throughout the entire hole depth in real time and accurately locate the hydrogen sulfide enrichment "target area". Once the enrichment target area is located, the sealing and water injection procedures can be started immediately to achieve "point-to-point removal" of the pollution source, avoiding the construction period delay caused by multiple drilling operations and eliminating the problem of target area deviation or gas escape caused by construction intervals.

[0015] 2. This invention controls the unfolding of the claw plate through a drive mechanism. The right-angled triangular notch at its front end can strongly directionally support the hole wall and provide huge anti-slip friction force. Together with the flexible expansion joint, it solves the problems of hole sealer movement and leakage during high-pressure water injection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the working process of the injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to the present invention. Figure 2 This is a three-dimensional structural schematic diagram of the injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to the present invention. Figure 3 for Figure 2 A three-dimensional structural diagram of the first crawling mechanism in the middle; Figure 4 for Figure 2 A schematic diagram of the top of the first crawling mechanism; Figure 5 for Figure 4 An enlarged schematic diagram of part A in the middle; Figure 6 for Figure 2 A cross-sectional view of the pre-support component.

[0017] In the diagram: 1. First crawling mechanism; 2. Fixed tube; 3. Locking mechanism; 4. High-pressure water injection mechanism; 5. Hose; 6. Bundle tube; 7. Second crawling mechanism; 31. Pre-support assembly; 32. Expansion joint; 101. Gas concentration detection mechanism; 102. Push cylinder; 103. Arc plate; 104. Main body; 105. Self-driving roller; 106. Baffle; 107. Sliding column; 108. Spring; 3101. Claw plate; 3102. Turning pin; 3103. Cylinder shell; 3104. Connecting handle; 3105. Pull rod; 3106. Screw; 3107. Bearing seat; 3108. Nut seat. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0019] Please see the appendix Figures 1-6 This embodiment provides a pressure injection device for treating hydrogen sulfide in low-permeability coal seams in underground coal mines, comprising: There are two crawling mechanisms, designated as the first crawling mechanism 1 and the second crawling mechanism 7 respectively. There are two locking mechanisms 3, and a fixed pipe 2 is fixedly connected between the two locking mechanisms 3; The high-pressure water injection mechanism 4 is installed on the middle side wall of the fixed pipe 2 and is connected to the water supply equipment through the high-pressure pipe; And a gas concentration detection mechanism 101, which is installed on the head of the first crawling mechanism 1; It should be noted that during the process of the equipment moving inside the borehole, the gas concentration detection mechanism 101 at the head can monitor the hydrogen sulfide concentration in real time throughout the entire borehole depth and accurately locate the hydrogen sulfide enrichment "target area". Once the enrichment target area is located, the sealing and water injection procedures can be started immediately to achieve "targeted removal" of the pollution source, avoiding the construction period delay caused by multiple drilling operations and eliminating the problem of target area shift or gas escape caused by construction intervals. The two locking mechanisms 3 are connected to the first crawling mechanism 1 and the second crawling mechanism 7 respectively through flexible hoses 5, and the rear end of the second crawling mechanism 7 is equipped with a bundle tube 6 for binding wires, water pipes, etc.

[0020] In this embodiment, the locking mechanism 3 consists of a pre-support component 31 and two expansion joints 32, wherein the two expansion joints 32 are symmetrically and fixedly connected to the left and right sides of the pre-support component 31.

[0021] Reference Figure 6 In this embodiment, the pre-support component 31 includes: The cylindrical shell 3103 has multiple sliding grooves arranged in a circular array on its side wall; The number of claw plates 3101 is the same as the number of sliding slots. Each claw plate 3101 is rotatably installed in its corresponding sliding slot using a pivot pin 3102. The connecting handle 3104 is rotatably connected to the rear end of each claw plate 3101; And a drive mechanism, which is installed inside the cylindrical shell 3103 and can drive each claw plate 3101 to perform synchronous unfolding or folding actions through the connecting handle 3104.

[0022] In this embodiment, the end corner of the front end of the claw plate 3101 is set as a right-angled triangular notch.

[0023] In this embodiment, the driving mechanism includes: There are two bearing housings 3107, which are symmetrically fixed inside the cylindrical shell 3103; The screw 3106 is rotatably mounted between two bearing seats 3107; Nut seat 3108 is threadedly connected to the threaded section of screw 3106; Pull rods 3105, which are the same number as connecting handles 3104, one end of each pull rod 3105 can be rotatably connected to the side wall of the nut seat 3108, and the other end of each pull rod 3105 can be rotatably connected to the corresponding connecting handle 3104. And a waterproof motor, which is fixed inside the cylindrical shell 3103 and drives the connecting screw 3106.

[0024] It should be noted that the pre-support component 31 is controlled by the drive mechanism to unfold the claw plate 3101. The right-angled triangular notch at its front end can forcefully "bite" into the hole wall, providing huge anti-slip friction force, which is the basis for withstanding the reaction force of high-pressure water injection. After mechanical anchoring, the expansion joint 32 is pressurized and expanded, tightly fitting the irregular hole wall to achieve a flexible seal. The mechanical part bears the main mechanical load, while the flexible part is responsible for fine sealing. The division of labor is clear and the synergy is enhanced, thereby achieving absolute sealing under higher water injection pressure (up to tens of megapascals). This fundamentally solves the core problem of hole sealer movement and leakage during high-pressure water injection, ensuring the stability and safety of the treatment process.

[0025] In this embodiment, the first crawling mechanism 1 and the second crawling mechanism 7 have the same structure.

[0026] Reference Figures 3-5 In this embodiment, the first crawling mechanism 1 includes: The main body 104 has multiple push cylinders 102 arranged in a circular array on its side wall; The number of arc-shaped plates 103 is the same as that of push cylinders 102, and each arc-shaped plate 103 is driven to be connected to its corresponding push cylinder 102. And self-driving rollers 105, each of the left and right ends of the arc plate 103 is equipped with a self-driving roller 105.

[0027] In this embodiment, a buffer groove is provided on the inner side wall of the arc plate 103, and the driving end of the push cylinder 102 is slidably connected in the buffer groove. Multiple springs 108 are connected between the driving end of the push cylinder 102 and the bottom of the buffer groove. The driving end of the push cylinder 102 is fixedly connected to one end of the slide column 107, and the other end of the slide column 107 passes through the arc plate 103 and is fixedly connected to the baffle 106.

[0028] It should be noted that the buffer mechanism composed of spring 108, sliding column 107, and baffle 106 can effectively absorb the violent pressure fluctuations and vibrations caused by coal body rupture during high-pressure water injection, protect the precision components inside the equipment, and prevent the lock seal from failing or the equipment from being damaged due to vibration. Example

[0029] This embodiment provides an injection method for the injection equipment used in the treatment of hydrogen sulfide in low-permeability coal seams in underground coal mines as described in Embodiment 1, including the following steps: Step 1: In the area of ​​abnormal hydrogen sulfide venting, construct a injection borehole, and then send the assembled injection equipment into the entrance of the target borehole via a traction cable. Step 2: As the injection equipment moves deeper into the borehole, the gas concentration detection mechanism 101 installed at the head of the first crawling mechanism 1 starts to work, monitoring and transmitting back hydrogen sulfide gas concentration data at different depths in the borehole in real time. Step 3: The control terminal analyzes the data transmitted back by the gas concentration detection mechanism 101, accurately locates the "target area" with abnormally high hydrogen sulfide concentration, and then finally docks the equipment at the center of the target area; Step 4: After the claw plate 3101 of the pre-support assembly 31 firmly grips the hole wall, high-pressure liquid is injected into the two expansion joints 32 to cause radial expansion and tightly fit the borehole wall to form a sealed isolation section in the center of the target area. Step 5: The high-pressure water injection mechanism 4 is connected to the water supply equipment through a high-pressure pipe, injecting high-pressure water into the sealed section of the target area isolated by the two locking mechanisms 3. The high-pressure water rapidly increases in pressure within the sealed section, overcoming the pore pressure of the low-permeability coal seam and forcibly injecting it into the micro-fractures and pores of the coal body. The chemical agents carried by the high-pressure water can neutralize or oxidize hydrogen sulfide to generate harmless or low-harm substances, thereby achieving precise treatment of hydrogen sulfide in the target area.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection device for treating hydrogen sulfide in low-permeability coal seams in underground coal mines, characterized in that, include: The crawling mechanism has two parts, which are respectively designated as the first crawling mechanism (1) and the second crawling mechanism (7). There are two locking mechanisms (3), and a fixed pipe (2) is fixedly connected between the two locking mechanisms (3). The high-pressure water injection mechanism (4) is installed on the middle side wall of the fixed pipe (2) and is connected to the water supply equipment through the high-pressure pipe; And a gas concentration detection mechanism (101), which is installed on the head of the first crawling mechanism (1); The two locking mechanisms (3) are connected to the first crawling mechanism (1) and the second crawling mechanism (7) respectively via hoses (5).

2. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 1, characterized in that: The locking mechanism (3) consists of a pre-support assembly (31) and two expansion joints (32), wherein the two expansion joints (32) are symmetrically and fixedly connected to the left and right sides of the pre-support assembly (31).

3. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 2, characterized in that: The pre-support component (31) includes: The cylindrical shell (3103) has multiple sliding grooves arranged in a circular array on its side wall; The number of claw plates (3101) is the same as that of the slide slots, and each of the claw plates (3101) is rotatably mounted in its corresponding slide slot by means of a pivot pin (3102); A connecting handle (3104) is rotatably connected to the rear end of each of the claw plates (3101). And a drive mechanism, which is installed inside the cylindrical shell (3103) and drives each claw plate (3101) to perform synchronous unfolding or folding actions via a connecting handle (3104).

4. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 3, characterized in that: The front end of the claw plate (3101) is provided with a right-angled triangular notch at the corner.

5. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 3, characterized in that: The drive mechanism includes: There are two bearing housings (3107), which are symmetrically fixed inside the cylindrical shell (3103); The screw (3106) is rotatably mounted between two bearing seats (3107); Nut seat (3108), which is threadedly connected to the threaded section of screw (3106); Pull rods (3105) are the same number as connecting handles (3104). One end of each pull rod (3105) is rotatably connected to the side wall of the nut seat (3108), and the other end of each pull rod (3105) is rotatably connected to the corresponding connecting handle (3104). And a waterproof motor, which is fixed inside the cylindrical shell (3103) and drives the connecting screw (3106).

6. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 1, characterized in that: The first crawling mechanism (1) and the second crawling mechanism (7) have the same structure.

7. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 6, characterized in that: The first crawling mechanism (1) includes: The main body (104) has multiple push cylinders (102) arranged in a circular array on its side wall. The number of arc-shaped plates (103) is the same as that of the push cylinders (102), and each of the arc-shaped plates (103) is driven to be connected to its corresponding push cylinder (102). And self-driving rollers (105), each of the arcuate plates (103) is equipped with self-driving rollers (105) at both the left and right ends.

8. The injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines according to claim 7, characterized in that: A buffer groove is provided on the inner side wall of the arc plate (103), and the driving end of the push cylinder (102) is slidably connected in the buffer groove. Multiple springs (108) are connected between the driving end of the push cylinder (102) and the bottom of the buffer groove. The driving end of the push cylinder (102) is fixedly connected to one end of the slide column (107), and the other end of the slide column (107) passes through the arc plate (103) and is fixedly connected to the baffle (106).

9. The injection method of the injection equipment for treating hydrogen sulfide in low-permeability coal seams in underground coal mines as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: In the area of ​​abnormal hydrogen sulfide venting, construct a injection borehole, and then send the assembled injection equipment into the entrance of the target borehole via a traction cable. Step 2: As the injection equipment moves deeper into the borehole, the gas concentration detection mechanism (101) installed on the head of the first crawling mechanism (1) starts to work, and monitors and transmits back the hydrogen sulfide gas concentration data at different depths in the borehole in real time. Step 3: The control terminal analyzes the data transmitted back by the gas concentration detection mechanism (101), accurately locates the "target area" with abnormally high hydrogen sulfide concentration, and then finally docks the equipment at the center of the target area; Step 4: After the claw plate (3101) of the pre-support assembly (31) firmly grips the hole wall, high-pressure liquid is injected into the two expansion joints (32) to cause radial expansion and tightly fit the borehole wall to form a sealed isolation section in the center of the target area. Step 5: The high-pressure water injection mechanism (4) is connected to the water supply equipment through a high-pressure pipe, and injects high-pressure water into the target area sealed section isolated by two locking mechanisms (3). The high-pressure water rapidly increases pressure in the sealed section, overcomes the pore pressure of the low-permeability coal seam, and is forced into the micro-cracks and pores of the coal body. The chemical agents carried by the high-pressure water can neutralize or oxidize hydrogen sulfide to generate harmless or low-harm substances, thereby achieving precise treatment of hydrogen sulfide in the target area.

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