A modular gas extraction system, method and device for underground coal mines

Abstract

The present invention relates to the technical field of coal mine gas extraction equipment, and provides a modular coal mine underground gas extraction system, method and device, including an extraction module, with a transmission pipe installed at both ends through an internal four-way pipe, a butterfly valve and a second clamp, which are common components in the entire extraction system; a sewage discharge unit, which is arranged at equal intervals every hundred meters along the path of the transmission pipe, and is provided with a sewage reservoir inside for intercepting coal powder and water in the gas, and a bypass pipe is provided on the outside of the sewage reservoir for bypassing the gas, combined with the opening and closing of the butterfly valve to form an operation effect in which sewage discharge and extraction do not interfere with each other. The present invention can realize the rapid connection of pipelines during single-person high-altitude operations, without the need for multiple workers to cooperate or carry on their shoulders, greatly reducing the difficulty of operation while improving construction safety. In addition, the extracted gas is processed twice, which can effectively intercept the coal powder and water contained therein, making it convenient for workers to clean and reducing the failure rate of the pipeline system.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas extraction equipment, and more specifically, to a modular gas extraction system, method and device for underground coal mines. Background Art

[0002] Mine gas is one of the five major hazards in coal mines and poses a threat to mine safety and production. To prevent gas levels from exceeding limits in the working face and eliminate the risk of coal face gas outbursts during mining, coal seam gas extraction is a key measure.

[0003] At present, it is found in actual gas extraction operations that gas will carry coal powder and water when it gushes out. During extraction, the gas will be brought out together with the coal powder, which will lead to the accumulation of water and coal powder, causing blockage in the extraction system, and posing a safety hazard to gas extraction operations underground in coal mines.

[0004] In order to solve the above problems, this application proposes a modular gas extraction system, method and device for underground coal mines. Summary of the Invention

[0005] The object of the present invention is to provide a modular gas extraction system, method and device for underground coal mines that can clean coal powder and water.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] A modular gas extraction system for underground coal mines, comprising an extraction module with transmission pipes installed at both ends through an internal four-way pipe, a butterfly valve and a second clamp, which are common components in the entire extraction system;

[0008] The sewage discharge units are arranged at equal intervals every 100 meters along the transmission pipe. A sewage trap is installed inside to intercept coal powder and water in the gas. A bypass pipe is installed outside the sewage trap to bypass the gas. Combined with the opening and closing of the butterfly valve, the sewage discharge and extraction operations do not interfere with each other.

[0009] The pre-treatment unit is located at one end of the intersection pipe above the four-way pipe. It has a pre-treatment unit inside and is connected to the intersection pipe through a transfer pipe on its side. It is used to form a pre-interception before the gas enters the four-way pipe, reducing the coal powder and water content of the gas in the four-way pipe and transmission pipe;

[0010] The extraction unit is located in the coal seam extraction area. It is equipped with a branch pipe inside that is connected to the intersection pipe. It is also equipped with an outer pipe, an inner pipe and an extraction pipe that penetrate into the coal seam in sequence. The junction of the branch pipe and the outer pipe is provided with a switching elbow and a connector below it, forming a segmented connection, which is used to reduce the difficulty of connecting the pipes in the coal seam in the high-altitude area and the pipes in the tunnel.

[0011] On the other hand, a sewage discharge device for gas extraction also includes a sewage reservoir and a pre-processor. The lower and upper ends of the sewage reservoir are respectively provided with a base and a top seat, which are installed and fixed by a first clamp on the outside to form a separate structure to facilitate sewage discharge operations. A water-stop unit is provided on the outside of the base for discharging water and preventing water backflow.

[0012] Finally, a method of gas extraction is described as follows:

[0013] S1, the pipeline connection stage in the coal seam: first, the outer pipe and the inner pipe are connected as one by screwing the adapter sleeve and the outer thread, and then the inner sleeve is screwed into the inner thread. At this time, the extraction pipe to be installed is directly inserted into the interior of the connecting sleeve to form a seal. As the number of pipelines in the coal seam increases, another extraction pipe can be directly inserted into the protruding pipe with the same structure as the connecting sleeve at one end of the extraction pipe to form a connection, achieving the effect of adding multiple sections of gas extraction pipelines;

[0014] S2, during the coal seam external pipeline connection stage, first connect the lower end of the branch pipe to the upper joint of the junction pipe, then directly insert the left end of the adapter elbow into the right end of the outer pipe and secure it with the second clamp. The lower end of the adapter elbow is then inserted into the upper end of the branch pipe and secured with the second clamp. At this point, the connector is rotated upwards so that the external threaded pipe is screwed onto the internal threaded pipe. This arrangement forms a segmented quick connection structure that can be operated by one person in high-altitude areas.

[0015] S3, gas intersection stage, multiple branch pipes are connected to the intersection pipe to form a pre-intersection, and finally intersect to the transmission pipe under the action of the cross pipe;

[0016] S4, the coal and water pre-interception stage: when the gas is pre-intersected, the pre-processor and the transfer pipe will pre-intercept the coal and water contained in the gas and store them in the pre-processor to reduce the coal and water content of the gas in the transmission pipe;

[0017] S5, pulverized coal and water interception stage: During gas transmission in the transmission pipe, the pulverized coal and water are intercepted by the dirt trap for a second time to ensure the safety of gas extraction;

[0018] S6. During the sewage discharge stage, the pulverized coal and water in the sewage reservoir are first blocked by a butterfly valve from the gas entering the sewage reservoir through the transmission pipe, so that the gas bypasses in the bypass pipe to maintain the original extraction performance. At this time, the interior of the sewage reservoir can be cleaned directly. The cleaning methods of the pre-processor and the sewage reservoir are the same.

[0019] Beneficial effects of the present invention:

[0020] The present invention arranges the sewage traps at equal intervals to intercept coal dust and water during extraction operations and store them inside to prevent blockage caused by circulation in the extraction pipeline. In addition, by adding bypass pipes, gas can be transmitted around the sewage traps, and the sewage traps can now directly clean the interior, achieving the effect of non-interference between gas extraction and sewage cleaning operations.

[0021] By adding a pre-processor, the present invention can intercept coal powder and water before the gas enters the transmission pipe, so that the coal powder and water content inside the gas is reduced during extraction and transmission, which can prevent the accumulation of coal powder in the pipeline and avoid local blockage during extraction operations.

[0022] The present invention can form a segmented connection structure between the connection area of ​​the pipeline in the coal seam and the pipeline in the tunnel through the combination of the adapter elbow and the connector, so that in the environment of high-altitude operation, there is no need for multiple people to cooperate in lifting and carrying heavy pipes by hand or on shoulders, and a single person can achieve quick connection operation, which solves the problem of time-consuming and labor-intensive underground pipeline connection, reduces the workers' high-altitude operation time, improves safety, and ensures the stability of the connection seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of sewage discharge unit structure;

[0026] Figure 3 for Figure 1 Schematic diagram of the pre-processing unit structure in;

[0027] Figure 4 for Figure 1 Schematic diagram of the extraction module structure;

[0028] Figure 5 for Figure 1 Schematic diagram of the decomposition structure of the extraction unit;

[0029] Figure 6 for Figure 1 Schematic diagram of the extraction unit merger and its local enlargement structure;

[0030] Figure 7 for Figure 5 Schematic diagram of the structure of the connector and the branch connection part;

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] In the picture:

[0033] 100, extraction module; 200, sewage discharge unit; 300, pretreatment unit; 400, extraction unit;

[0034] 110, four-way pipe; 120, transmission pipe; 130, intersection pipe;

[0035] 210, dirt reservoir; 211, base; 212, water stop unit; 213, top seat;

[0036] 220, bypass pipeline;

[0037] 310, pre-processor; 320, transfer tube; 330, gas sensor; 340, pressure sensor;

[0038] 410, branch pipe;

[0039] 420, adapter elbow;

[0040] 430, outer tube; 431, adapter sleeve;

[0041] 440, inner tube; 441, inner thread; 442, outer thread;

[0042] 450, extraction tube;

[0043] 460, connector; 461, tap; 462, internally threaded pipe; 463, externally threaded pipe;

[0044] 470, connecting sleeve; 471, inner sleeve;

[0045] 501, first clamp; 502, butterfly valve; 503, second clamp. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] See also Figure 1 - Figure 7 As shown, the present invention provides a modular gas extraction system, method and device for underground coal mines. Example 1

[0048] like Figure 1 - Figure 6 As shown, a modular gas extraction system for underground coal mines includes a extraction module 100, with transmission pipes 120 installed at both ends through an internal four-way pipe 110. A junction pipe 130 is installed above the four-way pipe 110. It also includes a butterfly valve 502 and a second clamp 503, which are common components in the entire extraction system and are used to connect various pipes.

[0049] The sewage discharge units 200 are evenly distributed along the path of the transmission pipe 120, with adjacent sewage discharge units 200 spaced 100 meters apart. Each unit has a sewage reservoir 210 installed inside, with the transmission pipe 120 connected to both sides. This reservoir is used to intercept coal dust and water carried by the gas being transmitted. A bypass pipe 220 is installed in the area of ​​the transmission pipe 120 adjacent to the sewage reservoir 210. This bypass pipe 220 is used to bypass the gas after the butterfly valve 502 closes the transmission pipe 120 on both sides of the sewage reservoir 210, maintaining the stability of the extraction operation. At this point, the sewage reservoir 210 can be cleaned directly, achieving the effect of non-interference between sewage discharge and extraction operations.

[0050] The pre-treatment unit 300 is located at one end of the junction pipe 130 and contains a pre-processor 310 for pre-treating the extracted gas to intercept the coal powder and water contained in it, significantly reducing the coal powder and water content when it enters the cross-way pipe 110. The pre-processor 310 is connected to the junction pipe 130 through a side transfer pipe 320;

[0051] The extraction unit 400 is located in the coal seam extraction area, which belongs to the high-altitude operation area at the top of the tunnel. It is provided with a branch pipe 410 connected to the intersection pipe 130, and is also provided with an outer pipe 430, an inner pipe 440 and an extraction pipe 450 that penetrate into the coal seam in sequence. A switching elbow 420 is provided at the junction of the branch pipe 410 and the outer pipe 430, and a connector 460 is provided below the switching elbow 420 to connect to the branch pipe 410, thereby forming a segmented connection, so that the branch pipe 410 and the outer pipe 430 can be pre-installed, and finally connected by the switching elbow 420 and the connector 460. At this time, the switching elbow 420 and the connector 460 are small in size and easy to operate compared to long and heavy pipes, thereby achieving a pipeline connection operation that can be quickly completed by one person in the high-altitude operation area, effectively reducing the difficulty of connecting the pipelines in the coal seam and the tunnel.

[0052] like Figure 2 As shown, butterfly valves 502 and second clamps 503 are provided at the connection points between the two sides of the sewage storage container 210 and the transmission pipe 120. The same arrangement is also provided at the junction of the bypass pipe 220 and the transmission pipe 120. When the butterfly valve 502 outside the transmission pipe 120 is closed, the butterfly valve 502 outside the bypass pipe 220 is in a passage state, thereby allowing the gas to be diverted to the bypass pipe 220 to maintain normal extraction operations.

[0053] like Figure 7As shown, a separate branch 461 is provided above the connecting head 460, and the protruding part of the lower port of the adapter elbow 420 is inserted into the upper end of the branch 461. The lower end of the branch 461 is provided with an internal threaded tube 462 which is spirally installed on the outside of the external threaded tube 463 above the connecting head 460, and the outer diameter of the external threaded tube 463 is retracted inward.

[0054] like Figure 5 - Figure 6 As shown, the right end of the extraction tube 450 is provided with a connecting sleeve 470 for connecting adjacent pipelines. The right end of the connecting sleeve 470 is an inner sleeve 471. The inner sleeve 471 is spirally installed on the inner side of the inner thread 441 at the left end of the inner tube 440. The outer thread 442 at the right end of the inner tube 440 is spirally installed on the inner side of the adapter sleeve 431 at the left end of the outer tube 430. The connecting sleeve 470 is used to connect adjacent pipelines. Its small size is used to reduce the difficulty of connecting adjacent pipelines in the coal seam. Example 2

[0055] like Figure 2 As shown, a sewage discharge device for gas extraction also includes a sewage container 210 and a pre-processor 310. The lower end and upper end of the sewage container 210 are respectively provided with a base 211 and a top seat 213, which are installed and fixed by a first clamp 501 on the outside. The base 211 and the top seat 213 can be taken out separately to clean the coal powder and water stored inside. In daily use, water is discharged through the water stop unit 212 on the right side of the base 211 adjacent to the lower area to prevent water backflow.

[0056] like Figure 3 As shown, since the coal powder and water content in the pretreatment area are relatively high, a pressure sensor 340 and a gas sensor 330 are respectively set on the left side and above the pretreatment unit 310 to monitor the gas situation in the pretreatment unit 310 in real time, ensure the stability and safety of the drainage operation, facilitate the workers' operation, and prevent the occurrence of safety accidents. The pipeline on which the pressure sensor is installed is mainly used to connect the underground compressed air pipeline to pressurize the container and enhance the drainage capacity. Example 3

[0057] like Figure 1 - Figure 7 As shown in FIG, a method for gas extraction: the specific method is as follows:

[0058] S1, in the coal seam pipe connection stage, first, the outer pipe 430 and the inner pipe 440 are connected as a whole by screwing the adapter sleeve 431 and the outer thread 442, and then the inner sleeve 471 is screwed to the inside of the inner thread 441. At this time, the extraction pipe 450 to be installed is directly inserted into the inside of the connecting sleeve 470 to form a seal. As the number of pipes in the coal seam increases, another extraction pipe 450 can be directly inserted into the protruding pipe with the same structure as the connecting sleeve 470 at one end of the extraction pipe 450 to form a connection, thereby achieving the effect of adding multiple sections of gas extraction pipes;

[0059] S2, during the coal seam external pipeline connection stage, first connect the lower end of the branch pipe 410 to the upper joint of the junction pipe 130, then directly insert the left end of the adapter elbow 420 into the right end of the outer pipe 430 and secure it with the second clamp 503. The lower end of the adapter elbow 420 is then inserted into the upper end of the branch head 461 and securely connected with the second clamp 503. At this time, the connector 460 is rotated upward so that the external threaded pipe 463 is screwed onto the internal threaded pipe 462. This arrangement forms a segmented quick connection structure that can be operated by one person in a high-altitude area.

[0060] S3, gas intersection stage, multiple branch pipes 410 are connected to the intersection pipe 130 to form a pre-intersection, and finally converge into the transmission pipe 120 under the action of the cross pipe 110;

[0061] S4, pulverized coal and water pre-interception stage: When the gas is pre-intersected, the pre-processor 310 and the transfer pipe 320 pre-intercept the pulverized coal and water contained in the gas and store them in the pre-processor 310 to reduce the pulverized coal and water content of the gas in the transmission pipe 120;

[0062] S5, coal powder and water interception stage: when gas is transmitted in the transmission pipe 120, coal powder and water are intercepted by the dirt reservoir 210 for a second time to ensure the safety of gas extraction;

[0063] In step S6, during the sewage discharge phase, the pulverized coal and water in the sewage reservoir 210 are first blocked by the butterfly valve 502 from the gas in the transmission pipe 120 entering the sewage reservoir 210, so that the gas bypasses in the bypass pipe 220 while maintaining the original extraction performance. At this time, the interior of the sewage reservoir 210 can be cleaned directly. The cleaning method of the pre-processor 310 and the sewage reservoir 210 is the same.

[0064] It can be understood that the present invention can realize the rapid connection of pipelines during single-person high-altitude operations without the need for cooperation or shoulder carrying by multiple workers. The difficulty of operation is greatly reduced while the construction safety is improved. In addition, the extracted gas is processed twice, which can effectively intercept the coal powder and water contained in it, making it convenient for workers to clean and reducing the failure rate of the pipeline system.

[0065] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A modular gas extraction system for underground coal mines, comprising an extraction module (100), with transmission pipes (120) installed at both ends through a four-way pipe (110) inside the extraction module, a butterfly valve (502) and a second clamp (503), which are common components in the entire extraction system, and are characterized by: The sewage discharge units (200) are arranged at equal intervals every 100 meters along the transmission pipe (120), and are provided with a sewage reservoir (210) inside for intercepting coal powder and water in the gas. A bypass pipe (220) is provided outside the sewage reservoir (210) for bypassing the gas. Combined with the opening and closing of the butterfly valve (502), an operation effect of sewage discharge and extraction without interference is achieved; The connection points between the two sides of the dirt reservoir (210) and the transmission pipe (120) are both provided with butterfly valves (502) and second clamps (503) for blocking gas from entering, and at this time, the interior of the butterfly valve (502) at the junction of the lower end of the bypass pipe (220) and the transmission pipe (120) is in a passage state; The pre-treatment unit (300) is located at one end of the intersection pipe (130) above the four-way pipe (110), has a pre-treatment unit (310) disposed therein, and is connected to the intersection pipe (130) via a transfer pipe (320) on its side, and is used to form a pre-interception before the gas enters the four-way pipe (110), thereby reducing the coal powder and water content of the gas in the four-way pipe (110) and the transmission pipe (120); The extraction unit (400) is located in the coal seam extraction area, and is provided with a branch pipe (410) inside that is connected to the intersection pipe (130), and is also provided with an outer pipe (430), an inner pipe (440) and an extraction pipe (450) that penetrate into the coal seam in sequence. The junction of the branch pipe (410) and the outer pipe (430) is provided with a switching elbow (420) and a connector (460) below it, forming a segmented connection, which is used to reduce the difficulty of connecting pipes in the coal seam in the high-altitude area and the pipes in the tunnel.

2. The modular gas extraction system for underground coal mines according to claim 1, characterized in that: The intersection pipe (130) is located above the four-way pipe (110) and is used to install the branch pipe (410) so that the extracted gas can be combined and enter the four-way pipe (110).

3. The modular gas extraction system for underground coal mines according to claim 2, characterized in that: The transfer pipe (320) is connected to the end of the junction pipe (130) through an upper pipe to form a pre-interception when the gas is combined with the pre-processor (310).

4. The modular gas extraction system for underground coal mines according to claim 3, characterized in that: A separate branch (461) is provided above the connector (460) and is connected to the lower port of the adapter elbow (420).

5. The modular gas extraction system for underground coal mines according to claim 4, characterized in that: The lower end of the branch head (461) is provided with an internal threaded tube (462) which is spirally mounted on the outside of the external threaded tube (463) above the connecting head (460).

6. The modular gas extraction system for underground coal mines according to claim 5, characterized in that: The right end of the extraction pipe (450) is provided with a connecting sleeve (470) for connecting adjacent pipelines, and the right end of the connecting sleeve (470) is an inner sleeve (471).

7. The modular gas extraction system for underground coal mines according to claim 6, characterized in that: The inner sleeve (471) is spirally mounted on the inner side of the inner thread (441) at the left end of the inner pipe (440), and the outer thread (442) at the right end of the inner pipe (440) is spirally mounted on the inner side of the adapter sleeve (431) at the left end of the outer pipe (430), thereby reducing the difficulty of connecting adjacent pipes in the coal seam.

8. The modular gas extraction system for underground coal mines according to claim 7, characterized in that: The lower end and upper end of the sewage storage container (210) are respectively provided with a base (211) and a top seat (213), which are installed and fixed by a first clamp (501) on the outside to form a separated structure to facilitate sewage discharge operations. The outside of the base (211) is provided with a water stop unit (212) for discharging water and preventing water backflow.

9. The modular gas extraction system for underground coal mines according to claim 8, characterized in that: A pressure sensor (340) and a gas sensor (330) are respectively provided on the left side and the top of the pre-processor (310) for real-time monitoring of the gas situation in the pre-processor (310) to ensure the stability and safety of the drainage operation. The pipe on which the pressure sensor is installed is used to connect to the underground compressed air pipe to pressurize the pre-processor (310) and enhance the drainage capacity.

10. A gas extraction method, applied to the modular gas extraction system for underground coal mines according to claim 9, characterized in that: The specific method is as follows: S1, the pipeline connection stage in the coal seam, first, the outer pipe (430) and the inner pipe (440) are connected as a whole by screwing the adapter sleeve (431) and the outer thread (442), and then the inner sleeve (471) is screwed to the inside of the inner thread (441). At this time, the extraction pipe (450) to be installed is directly inserted into the inside of the connecting sleeve (470) to form a seal. As the number of pipelines in the coal seam increases, another extraction pipe (450) can be directly inserted into the protruding pipe with the same structure as the connecting sleeve (470) at one end of the extraction pipe (450) to form a connection, thereby achieving the effect of increasing the extraction gas pipeline in multiple sections; S2, during the coal seam outer pipeline connection stage, first connect the lower end of the branch pipe (410) to the upper joint of the junction pipe (130), and then directly insert the left end of the adapter elbow (420) into the right end of the outer pipe (430), and connect and fix it with the second clamp (503), while the lower end of the adapter elbow (420) is inserted into the upper end of the branch head (461), and connect and fix it with the second clamp (503). At this time, the connector (460) is rotated upward so that the external threaded pipe (463) is screwed to the internal threaded pipe (462). This arrangement forms a segmented quick connection structure that can be operated by one person in a high-altitude area; S3, gas intersection stage, multiple branch pipes (410) are connected to the intersection pipe (130) to form a pre-intersection, and finally converge to the transmission pipe (120) under the action of the four-way pipe (110); S4, coal powder and water pre-interception stage, when the gas is pre-intersected, the pre-processor (310) is combined with the transfer pipe (320) to pre-intercept the coal powder and water contained in the gas, and store them in the pre-processor (310) to reduce the coal powder and water content of the gas in the transmission pipe (120); S5, coal powder and water interception stage, when gas is transmitted in the transmission pipe (120), coal powder and water are intercepted for a second time by the dirt storage device (210) to ensure the safety of gas extraction; In step S6, during the sewage discharge phase, the pulverized coal and water in the sewage reservoir (210) are first blocked by the butterfly valve (502) from entering the gas in the sewage reservoir (210) through the transmission pipe (120), so that the gas bypasses in the bypass pipe (220) to maintain the original extraction performance. At this time, the interior of the sewage reservoir (210) can be directly cleaned. The cleaning method of the pre-processor (310) and the sewage reservoir (210) is the same.

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