Underground coal mine modular gas extraction system, method and device

Abstract

The invention relates to the technical field of coal mine gas extraction equipment, and provides a coal mine underground modular gas extraction system, method and device, which comprises an extraction module, a butterfly valve and a second hoop, transmission pipes are mounted at two ends of the extraction module through a four-way pipe in the extraction module, and the extraction module is a universal assembly in the whole extraction system; and the pollution discharge units are arranged on the path of the conveying pipe at equal intervals every 100 meters, pollution storages are arranged in the pollution discharge units and used for intercepting pulverized coal and water in the gas, bypassing pipelines are arranged on the outer sides of the pollution storages and used for bypassing the gas, and the operation effect that pollution discharge and extraction do not interfere with each other is achieved by combining connection and disconnection of butterfly valves. According to the invention, the pipeline can be quickly connected when a single person works high above the ground, a plurality of workers are not required to cooperate or carry the pipeline on the shoulder, the operation difficulty is greatly reduced, the construction safety is improved, in addition, the extracted gas is treated twice, coal dust and water containing belts can be effectively intercepted, the workers can conveniently clean the gas, and the fault rate of a pipeline system is reduced.

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 disasters in coal mines and poses a threat to mine safety production. In order to ensure that the working face does not exceed the limit of gas during the mining process and eliminate the danger of outstanding work, coal seam gas extraction is one of the main measures.

[0003] At present, in actual gas extraction operations, it is found that when gas gushes out, it will carry coal powder and water. 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, the present 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 capable of cleaning coal powder and water.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: A modular gas extraction system for underground coal mines, comprising an extraction module, a transmission pipe being installed at both ends through a four-way pipe inside the extraction module, a butterfly valve and a second clamp, which are common components in the entire extraction system; The sewage discharge unit is arranged at equal intervals every 100 meters along the transmission pipe. A sewage reservoir is provided inside to intercept coal powder and water in the gas. A bypass pipe is provided outside the sewage reservoir to bypass the gas. Combined with the opening and closing of the butterfly valve, the sewage discharge and extraction do not interfere with each other. The pretreatment unit is located at one end of the intersection pipe above the four-way pipe, and is provided with a pretreatment unit inside. It is connected to the intersection pipe through a transfer pipe on its side, and is used to form a pre-interception before the gas enters the four-way pipe, so as to reduce the coal powder and water content of the gas in the four-way pipe and the transmission pipe; The extraction unit is located in the coal seam extraction area and is internally provided with a branch pipe connected to the intersection pipe. It is also provided with an outer pipe, an inner pipe and an extraction pipe that successively penetrate into the coal seam. A switching elbow and a connector below it are provided at the junction of the branch pipe and the outer pipe, 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.

[0007] On the other hand, a sewage discharge device for gas extraction also includes a sewage reservoir and a pre-treatment device. The lower end and upper end 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 separated structure to facilitate sewage discharge operations. A water stopping unit is provided on the outside of the base for discharging water and preventing water backflow.

[0008] Finally, a method of gas extraction is described as follows: S1, in the stage of connecting the pipeline in the coal seam, firstly, 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 to the inner thread. At this time, the extraction pipe to be installed is directly inserted into the inside 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, so as to achieve the effect of adding multiple sections of extraction gas pipelines; S2, in the stage of connecting the pipeline outside the coal seam, first connect the lower end of the branch pipe to the upper joint of the intersection pipe, and then directly insert the left end of the transfer elbow into the right end of the outer pipe and connect and fix it with the second clamp, and the lower end of the transfer elbow is inserted into the upper end of the branch head and connected and fixed by the second clamp. At this time, the connector is rotated upward so that the external threaded pipe is screwed to the internal threaded pipe. This arrangement forms a segmented quick connection structure that can be operated by one person in the high-altitude area; 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 four-way pipe; S4, coal powder and water pre-interception stage, when the gas is pre-intersected, the pre-processor combines with the transfer tube to pre-intercept the coal powder and water contained in the gas, and stores them in the pre-processor to reduce the coal powder and water content of the gas in the transmission pipe; S5, coal powder and water interception stage, when gas is transmitted in the transmission pipe, coal powder and water are intercepted by the dirt storage device for the second time to ensure the safety of gas extraction; S6, during the sewage discharge stage, the coal powder 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 inside of the sewage reservoir can be cleaned directly, and the cleaning methods of the pre-treatment unit and the sewage reservoir are the same.

[0009] Beneficial effects of the present invention: The present invention can intercept coal powder and water during extraction operations by arranging the sewage traps at equal intervals, and store them inside to prevent blockage caused by circulation in the extraction pipeline. In addition, by adding bypass pipelines, gas can be transmitted around the sewage traps, and the sewage traps can now directly clean the inside, thereby achieving the effect of non-interference between gas extraction and sewage cleaning operations.

[0010] The present invention can intercept coal powder and water before the gas enters the transmission pipe by adding a pre-processor, 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.

[0011] 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, thus solving the problem of time-consuming and labor-intensive underground pipeline connection, reducing the workers' high-altitude operation time and improving safety, while ensuring the stability of the connection seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the sewage discharge unit structure; Figure 3 for Figure 1 Schematic diagram of the pre-processing unit structure in; Figure 4 for Figure 1 Schematic diagram of the extraction module structure; Figure 5 for Figure 1 Schematic diagram of the decomposition structure of the extraction unit in; Figure 6 for Figure 1 Schematic diagram of the extraction unit merger and its local enlarged structure; Figure 7 for Figure 5 A schematic diagram of the structure of the connector and the branch connection part; In the accompanying drawings, the components represented by the reference numerals are listed as follows: In the figure: 100, extraction module; 200, sewage discharge unit; 300, pretreatment unit; 400, extraction unit; 110, four-way pipe; 120, transmission pipe; 130, intersection pipe; 210, dirt storage container; 211, base; 212, water stop unit; 213, top seat; 220, bypass pipeline; 310, preprocessor; 320, transfer tube; 330, gas sensor; 340, pressure sensor; 410, branch pipe; 420, adapter elbow; 430, outer tube; 431, adapter sleeve; 440, inner tube; 441, inner thread; 442, outer thread; 450, extraction tube; 460, connector; 461, tap; 462, internal threaded pipe; 463, external threaded pipe; 470, connecting sleeve; 471, inner sleeve; 501, first clamp; 502, butterfly valve; 503, second clamp. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0015] See also Figure 1 - Figure 7 As shown, the present invention provides a modular gas extraction system, method and device for underground coal mines. Embodiment 1

[0016] like Figure 1 - Figure 6 As shown, a modular gas extraction system for underground coal mines includes an extraction module 100, a transmission pipe 120 is installed at both ends through a four-way pipe 110 inside the module, a junction pipe 130 is installed above the four-way pipe 110, and a butterfly valve 502 and a second clamp 503 are also included, which are common components in the entire extraction system and are used to connect various pipes; The sewage discharge units 200 are evenly distributed on the path of the transmission pipe 120, and the adjacent sewage discharge units 200 are spaced one hundred meters apart. A sewage reservoir 210 is provided inside, and the transmission pipe 120 is connected to the left and right sides to intercept the coal powder and water contained in the gas transmitted by it. A bypass pipe 220 is provided in the area of ​​the transmission pipe 120 adjacent to the sewage reservoir 210 to allow the gas to bypass and continue to maintain the stability of the extraction operation after the butterfly valve 502 closes the transmission pipe 120 on both sides of the sewage reservoir 210. At this time, the sewage reservoir 210 can be directly cleaned, so that the sewage discharge and extraction operations do not interfere with each other; The pre-treatment unit 300 is located at one end of the intersection pipe 130, and is provided with a pre-treatment unit 310 inside, which is used to pre-treat the extracted gas to intercept the coal powder and water contained therein, so that the content of coal powder and water is greatly reduced when the gas flows into the four-way pipe 110. The pre-treatment unit 310 is connected to the intersection pipe 130 through the transfer pipe 320 on the side; 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 with long and heavy pipes. Thus, the pipeline connection operation can be quickly completed by one person in the high-altitude operation area, which effectively reduces the difficulty of connecting the pipelines in the coal seam and the tunnel.

[0017] 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, and 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.

[0018] like Figure 7 As shown, a separate branch 461 is provided above the connector 460, the protruding portion of the lower port of the adapter elbow 420 is inserted into the upper end of the branch 461, and an internal threaded tube 462 is provided at the lower end of the branch 461, which is spirally installed on the outside of the external threaded tube 463 above the connector 460, and the outer diameter of the external threaded tube 463 is retracted inward.

[0019] 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. Embodiment 2

[0020] like Figure 2As 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 outer clamp 501. 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.

[0021] 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 arranged on the left side and the top of 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. Embodiment 3

[0022] like Figure 1 - Figure 7 As shown, a method for gas extraction is as follows: S1, in the stage of connecting the pipeline in the coal seam, firstly, 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, and the extraction pipe 450 to be installed at this time is directly inserted into the inside of the connecting sleeve 470 to form a seal. With the increase of the pipeline in the coal seam, 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, so as to achieve the effect of adding multiple sections of extraction gas pipelines; S2, in the coal seam outer pipeline connection stage, first connect the lower end of the branch pipe 410 to the upper joint of the intersection 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 by the second clamp 503, and the lower end of the adapter elbow 420 is inserted into the upper end of the branch head 461, and connected and fixed by the second clamp 503, and at this time, the connector 460 is rotated upward so that the external threaded pipe 463 is screwed to the internal threaded pipe 462, and this arrangement forms a segmented quick connection structure that can be operated by one person in the 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 intersect 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 combines with the transfer tube 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 the gas is transmitted in the transmission pipe 120, the coal powder and water are intercepted by the dirt storage device 210 for a second time to ensure the safety of gas extraction; S6, sewage discharge stage, the coal powder and water in the sewage reservoir 210 first block the gas in the transmission pipe 120 from entering the sewage reservoir 210 through the butterfly valve 502, 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 cleaned directly, and the cleaning method of the pre-treatment unit 310 and the sewage reservoir 210 is the same.

[0023] It can be understood that the present invention can realize the rapid connection of pipelines when a single person works at high altitude, without the need for cooperation or shoulder carrying by multiple workers, which greatly reduces the difficulty of operation and improves construction safety. 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 up and reducing the failure rate of the pipeline system.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0025] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. 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, and also comprising 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 path of the transmission pipe (120), and are provided with sewage traps (210) inside for intercepting coal powder and water in the gas. A bypass pipe (220) is provided outside the sewage trap (210) for bypassing the gas, and the opening and closing of the butterfly valve (502) are combined to achieve an operation effect in which sewage discharge and extraction do not interfere with each other; The pre-treatment unit (300) is located at one end of the intersection pipe (130) above the four-way pipe (110), and is provided with a pre-treatment unit (310) therein. The pre-treatment unit (310) is connected to the intersection pipe (130) via a transfer pipe (320) on the side thereof, 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) connected to the intersection pipe (130), and is also provided with an outer pipe (430), an inner pipe (440) and an extraction pipe (450) which are sequentially extended into the coal seam. A transition elbow (420) and a connector (460) below the branch pipe (410) are provided at the junction with the outer pipe (430), forming a segmented connection, which is used to reduce the difficulty of connecting pipes in the coal seam in the high-altitude area and in the tunnel.

2. A modular gas extraction system for underground coal mines according to claim 1, characterized in that: 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. At this time, the inside 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.

3. A modular gas extraction system for underground coal mines according to claim 2, 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 connected and enter the four-way pipe (110).

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

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

6. A modular gas extraction system for underground coal mines according to claim 5, 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).

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

8. A modular gas extraction system for underground coal mines according to claim 7, characterized in that: The inner sleeve (471) is spirally installed 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 installed on the inner side of the adapter sleeve (431) at the left end of the outer pipe (430), so as to reduce the difficulty of connecting adjacent pipes in the coal seam.

9. A gas drainage device, applied to a modular gas drainage system for underground coal mines as claimed in any one of claims 1 to 8, further comprising a sewage storage device (210) and a pre-processor (310), 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, so as to form a separated structure to facilitate sewage discharge operations. A water stop unit (212) is provided on the outside of the base (211) for discharging water and preventing water backflow.

10. A gas drainage device according to claim 9, 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 pipeline on which the pressure sensor is installed is used to connect to the underground compressed air pipeline to pressurize the pre-processor (310) and enhance the drainage capacity.

11. A gas extraction method, applied to a modular gas extraction system for underground coal mines as claimed in claim 8, characterized in that: The specific method is as follows: S1, in the coal seam internal pipeline connection stage, the outer pipe (430) and the inner pipe (440) are first connected as one by screwing the adapter sleeve (431) and the outer thread (442), and then the inner sleeve (471) is screwed to the inner thread (441). At this time, the extraction pipe (450) to be installed is directly inserted into the interior 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, in the coal seam outer pipeline connection stage, firstly, the lower end of the branch pipe (410) is connected to the upper joint of the intersection pipe (130), and then the left end of the transfer elbow (420) is directly inserted into the right end of the outer pipe (430), and is connected and fixed by the second clamp (503), and the lower end of the transfer elbow (420) is inserted into the upper end of the branch head (461), and is connected and fixed by the second clamp (503), and at this time, the connector (460) is rotated upward so that the external threaded pipe (463) is screwed to the internal threaded pipe (462), and 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 intersect 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 tube (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 the gas is transmitted in the transmission pipe (120), the coal powder and water are intercepted by the dirt storage device (210) for a second time, so as to ensure the safety of gas extraction; S6, during the sewage discharge stage, the coal powder 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-treatment unit (310) and the sewage reservoir (210) is the same.

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