Coal mine gas extraction drilling gas spill prevention device

Abstract

The utility model discloses a coal mine gas extraction drilling gas anti -spill device, including the box, the box one end has L type slag discharge port guide pipe and has L type water outlet pipe in another end, and the vertical section of L type slag discharge port guide pipe and L type water outlet pipe is located below the horizontal section, the bottom of L type slag discharge port guide pipe vertical section has the soft interface cloth seat of convergence, the top of box is provided with a pair of gas passage, and the lower end of gas passage is connected in the box inner chamber, the top of gas passage has the negative pressure pipeline connection mouth, and the pipeline of gas passage is crosscut and has the dehumidification box of convergence on, and the coal residue that enters the box is gathered in the coal residue deposition groove, can push out to the case outside through the opening spiral pusher and the end valve and push the coal residue that deposits in the bottom layer together with partial mixed liquid to the case outside after accumulating to certain amount, and the water seal effect can prevent gas overflow, avoids gas overflow and waste phenomenon caused when opening the coal mouth every time simultaneously, guarantees the equipment continuous efficient operation.

Description

Technical Field

[0001] This utility model relates to the field of gas extraction technology, specifically a gas overflow prevention device for coal mine gas extraction boreholes. Background Technology

[0002] Coal mine gas drainage boreholes are a technical means of reducing mine gas concentration and preventing accidents by pre-drilling boreholes in coal seams or goaf areas and using drainage equipment to extract gas to the surface. During the drilling process, a mixture carrying a large amount of gas, coal slag, water, and a small amount of dust can easily create a blowout at the borehole opening, thus affecting safe underground construction. In related technologies, such as the patented coal mine gas drainage borehole gas overflow prevention device with announcement number CN210483795U, a mixture of gas, coal slag, and water flowing from the slag discharge pipe outlet flows into the tank. Under the suction effect of the negative pressure pipeline, some of the gas in the mixture is drawn into the negative pressure pipeline. When the mixture flows from the slag discharge pipe connection to the water outlet, it forms a "W" shaped flow due to the obstruction of the baffle, which prolongs the flow distance. The coal slag in the mixture slides along the coal chute to the bottom of the tank. After accumulating to a certain amount, it is cleaned out of the tank through the coal scooping port. This can effectively prevent the gas from getting out of control at the slag discharge port and exceeding the limit during the construction of the gas drainage borehole.

[0003] However, the above-mentioned device still has some shortcomings in practicality: 1. Because the mixture entering the chamber will generate a lot of water vapor, and the water vapor will also contain a small amount of gas, the water vapor will easily be discharged from the outlet along with the excess water, resulting in gas waste and increased safety hazards; in addition, when the gas channel is pumping out gas, it will also suck out water vapor and a small amount of dust, which will cause inconvenience to the subsequent screening and filtration work.

[0004] 2. This device requires coal slag to be accumulated to a certain amount each time before it can be cleaned out of the box through the coal scooping port. This is not only cumbersome to operate, but also inevitably causes gas overflow and waste every time the coal scooping port is opened, which is not conducive to continuous operation. Utility Model Content

[0005] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0006] Therefore, the purpose of this utility model is to provide a gas overflow prevention device for coal mine gas drainage boreholes, in order to solve the problems mentioned in the background art regarding the gas overflow prevention device for coal mine gas drainage boreholes, which easily leads to water vapor being discharged from the outlet along with excess water, resulting in gas waste and increased safety hazards; and the gas channel also sucks out water vapor and a small amount of dust along with the gas during gas drainage, causing inconvenience to subsequent screening and filtration work; and the need to clean the coal slag out of the box through the coal scooping port after a certain amount has accumulated each time, which is not only cumbersome to operate, but also inevitably causes gas overflow and waste every time the coal scooping port is opened, which is not conducive to continuous operation.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a gas overflow prevention device for coal mine gas extraction boreholes, comprising a housing, one end of which has an L-shaped slag discharge port conduit and the other end has an L-shaped water outlet pipe, the vertical sections of the L-shaped slag discharge port conduit and the L-shaped water outlet pipe being located below the horizontal section, and a flexible joint fabric seat being connected to the bottom of the vertical section of the L-shaped slag discharge port conduit. The top of the box is provided with a pair of gas channels, the lower end of which is connected to the inner cavity of the box. The top of the gas channel has a negative pressure pipeline connection port. A dehumidification box is connected to the gas channel pipe in a cross-section. A dust filter assembly is provided on the top of the inner side of the box. The gas inside the box enters the gas channel after passing through the dust filter assembly. A discharge port is provided at the lowest point of the bottom of the box, and a spiral pusher is fixed to the bottom of the outer side of the box, with the input end of the spiral pusher corresponding to the discharge port.

[0008] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, the flexible joint material base includes a floating ring located directly below the vertical section of the L-shaped slag discharge port guide pipe, and a flexible joint curtain surrounding and connecting the floating ring and the opening of the vertical section of the L-shaped slag discharge port guide pipe.

[0009] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, a butterfly valve is also provided at the lower end of the gas channel, and the butterfly valve is located below the dehumidification box.

[0010] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, a moisture-absorbing filter element is horizontally inserted and installed inside the dehumidification box, and a replacement port and a corresponding sealing plate are provided on one side of the dehumidification box.

[0011] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, the dust filter assembly includes vertical partitions fixed to the top two sides of the inner side of the box, positioning slots located on opposite sides of the two vertical partitions, a filter screen plate horizontally inserted into the inner side of the positioning slot, and a replacement port opened on one side of the box and a sealing plate corresponding to the replacement port. The filter plate is located directly below the two gas channels, and the front and rear ends of the two vertical partitions are fixedly connected to the inner side wall of the box.

[0012] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, during operation, the bottom of the floating ring floats and adheres to the liquid surface, and the bottom of the vertical section of the L-shaped water outlet pipe is located below the liquid surface and above the coal slag deposit layer.

[0013] As a preferred embodiment of the coal mine gas extraction borehole gas overflow prevention device of this utility model, the inner side of the box body has several chute inclined plates, and multiple chute inclined plates form an enclosed coal slag sedimentation trough, and the discharge port is located at the lowest point of the coal slag sedimentation trough.

[0014] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, an observation window is also provided on one side of the box body, and the inner side of the observation window has tempered glass.

[0015] As a preferred embodiment of the gas overflow prevention device for coal mine gas extraction boreholes described in this utility model, the bottom four corners of the box body are also provided with support legs.

[0016] Compared with the prior art, the beneficial effects of this utility model are: (i) When using this type of coal mine gas drainage borehole gas overflow prevention device, water is first injected into the tank so that the liquid level is flush with the lower edge of the horizontal section of the L-shaped water outlet pipe. The mixture extracted from the drilling will enter the tank through the L-shaped slag discharge pipe, and with the cooperation of the floating ring and the flexible curtain, the mixture will fall directly below the liquid surface, preventing and reducing the impact of the solid-liquid mixture on the liquid surface, which will cause water vapor and dust to disperse. The gas entering the water will rise to the liquid surface in time due to its light weight, and the excess water will be discharged directly outside the tank through the downward-protruding L-shaped water outlet pipe, thereby partially preventing water vapor, dust and a small amount of gas from being discharged from the water outlet pipe, avoiding gas overflow and waste. At the same time, the dust and water vapor contained in the gas extracted through the gas channel will be filtered through the dust filter component and the dehumidification box, which will facilitate the subsequent gas purification treatment.

[0017] (ii) In the gas drainage borehole gas overflow prevention device of this kind, during the gas drainage process, the coal slag entering the box accumulates in the coal slag sedimentation tank. After accumulating to a certain amount, the coal slag deposited at the bottom along with some mixed liquid can be pushed out of the box by opening the spiral pusher and the end valve. The water seal effect can prevent gas overflow and avoid gas overflow and waste caused by opening the coal scooping port every time, thus ensuring the continuous and efficient operation of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the device of this utility model; Figure 2 This is a schematic diagram of the internal structure of the box body of this utility model; Figure 3 This is a schematic diagram of the front view of the box body of this utility model for operational demonstration; Figure 4 This is a schematic diagram of the dust filter assembly structure of this utility model; Figure 5 This is a schematic diagram of the dehumidification box structure of this utility model.

[0019] In the diagram: 100, housing; 110, L-shaped slag discharge pipe; 120, L-shaped water outlet pipe; 130, coal chute inclined plate; 140, discharge port; 150, support leg; 160, observation window; 170, tempered glass; 200, flexible joint cloth support; 210, floating ring; 220, flexible joint curtain; 300, gas channel; 310, negative pressure pipeline connection port; 320, butterfly valve; 400, dehumidification box; 410, moisture-absorbing filter element; 420, sealing plate one; 500, dust filter assembly; 510, vertical partition; 5101, positioning slot; 520, filter screen plate; 530, sealing plate two; 600, spiral pusher. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Figures 1-5The diagram shown is a complete structural schematic of a gas overflow prevention device for coal mine gas drainage boreholes according to this utility model. Please refer to [link / reference]. Figures 1-5 This embodiment of a gas overflow prevention device for coal mine gas drainage boreholes includes a housing 100. One end of the housing 100 has an L-shaped slag discharge pipe 110, and the other end has an L-shaped water outlet pipe 120. The vertical sections of the L-shaped slag discharge pipe 110 and the L-shaped water outlet pipe 120 are located below the horizontal section. A flexible material distribution seat 200 is connected to the bottom of the vertical section of the L-shaped slag discharge pipe 110. A pair of gas channels 300 are provided at the top of the housing 100, and the lower ends of the gas channels 300 are connected to the housing 100. The gas channel 300 has a negative pressure pipeline connection port 310 at the top of the inner cavity. A dehumidification box 400 is horizontally connected to the pipeline of the gas channel 300. A dust filter assembly 500 is installed on the top inner side of the box 100. The gas in the box 100 enters the gas channel 300 after passing through the dust filter assembly 500. A discharge port 140 is opened at the lowest point of the bottom of the box 100. A spiral pusher 600 is fixed on the bottom outer side of the box 100, and the input end of the spiral pusher 600 corresponds to the discharge port 140.

[0024] In this embodiment, the flexible fabric support 200 includes a floating ring 210 located directly below the vertical section of the L-shaped slag discharge port conduit 110, and a flexible curtain 220 surrounding and connecting the floating ring 210 and the vertical section of the L-shaped slag discharge port conduit 110. Through the cooperation of the floating ring 210 and the flexible curtain 220, the mixture introduced by the L-shaped slag discharge port conduit 110 can fall directly below the liquid surface inside the tank 100, preventing and reducing the impact of the solid-liquid mixture on the liquid surface, which would cause water vapor and dust dispersion. Meanwhile, the gas entering the water, due to its light weight, will instantly rise to the surface. A butterfly valve 320 is also provided at the lower end of the gas channel 300, and the butterfly valve 320 is located below the dehumidification box 400. It is understood that the butterfly valve 320 is an electric butterfly valve, which is more convenient to use. A moisture-absorbing filter element 410 is horizontally inserted inside the dehumidification box 400, and a replacement port and a corresponding sealing plate 420 are located on one side of the dehumidification box 400. The moisture-absorbing filter element 410 can be made of honeycomb moisture-absorbing silica gel plate, activated carbon composite moisture-absorbing plate, water purification filter element, etc. This type of dehumidifying filter element has high filtration efficiency. In practical applications, one or more filter elements can be set as needed, and there is no limitation on this. The dust filter assembly 500 includes vertical partitions 510 fixed to the top sides of the inner side of the housing 100, positioning slots 5101 located on the opposite side of the two vertical partitions 510, a filter screen plate 520 horizontally inserted into the inner side of the positioning slot 5101, and a replacement port opened on one side of the housing 100 and a sealing plate 530 corresponding to the replacement port; wherein, the filter screen plate 520 is located directly below the two gas channels 300, and the front and rear ends of the two vertical partitions 510 are respectively fixedly connected to the inner side wall of the housing 100. It should be noted that since the extracted solid-liquid mixture carries relatively little dust, the filter screen 520 does not need to be replaced frequently. Furthermore, the large area of ​​the filter screen 520 is sufficient to meet the dust filtration requirements for one working cycle. During operation, the bottom of the floating ring 210 floats and adheres to the liquid surface, and the bottom of the vertical section of the L-shaped outlet pipe 120 is located below the liquid surface and above the slag deposit layer. Specifically, water is first injected into the tank 100 so that the liquid level is flush with the lower edge of the horizontal section of the L-shaped water outlet pipe 120. The mixture extracted from the drilling will enter the tank 110 through the L-shaped slag discharge pipe 110. With the cooperation of the floating ring 210 and the flexible curtain 220, the mixture will fall directly below the liquid surface, preventing and reducing the impact of the solid-liquid mixture on the liquid surface, which would cause water vapor and dust to disperse. The gas entering the water will rise to the surface in time due to its light weight. Excess water will be discharged directly out of the tank through the downward-protruding L-shaped water outlet pipe 120, thus partially preventing water vapor, dust and a small amount of gas from being discharged from the water outlet pipe, avoiding gas overflow and waste. At the same time, the dust and water vapor contained in the gas drawn through the gas channel 300 will be filtered through the dust filter assembly 500 and the dehumidification box 400, which will facilitate the subsequent gas purification treatment.

[0025] It should be noted that when replacing the moisture-absorbing filter element 410, it is only necessary to shut off one side of the gas channel 300 and the corresponding butterfly valve 320. The gas channel 300 on the other side can continue gas extraction operations. After shutting off, the sealing plate 420 can be opened and the moisture-absorbing filter element 410 inside the box can be replaced. With this coordination, the equipment does not need to be stopped during replacement, and gas overflow can be prevented during replacement.

[0026] In this embodiment, the inner perimeter of the housing 100 is provided with several inclined coal chute plates 130, which together form an enclosed coal slag sedimentation trough. The discharge port 140 is located at the lowest point of the coal slag sedimentation trough. During the gas extraction process, the coal slag entering the housing 100 accumulates in the coal slag sedimentation trough. Once a certain amount has accumulated, the coal slag deposited at the bottom, along with some mixed liquid, can be pushed out of the housing by opening the spiral pusher 600 and the end valve. The water seal prevents gas overflow and avoids gas overflow and waste caused by opening the coal scooping port each time, ensuring continuous and efficient operation of the equipment.

[0027] Furthermore, an observation window 160 is provided on one side of the container 100, and the inner side of the observation window 160 has tempered glass 170. The observation window 160 and the tempered glass 170 facilitate staff to observe the coal slag deposition and internal operation of the container 100 from the outside.

[0028] Furthermore, the four corners of the bottom of the housing 100 are also equipped with support legs 150. The support legs 150 can provide stable support for the device. In other embodiments, a base plate with mounting holes can also be provided at the bottom of the support legs 150 for easy installation and fixing.

[0029] Furthermore, the gas overflow prevention device for coal mine gas extraction boreholes in this utility model can be controlled and operated by external programming such as PLC, which will not be elaborated further.

[0030] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coal mine gas extraction drilling gas overflow prevention device, characterized in that, Includes a housing (100), one end of which has an L-shaped slag discharge port conduit (110) and the other end has an L-shaped water outlet pipe (120). The vertical sections of the L-shaped slag discharge port conduit (110) and the L-shaped water outlet pipe (120) are located below the horizontal section. The bottom of the vertical section of the L-shaped slag discharge port conduit (110) is connected to a flexible fabric support (200). The top of the box (100) is provided with a pair of gas channels (300), the lower end of the gas channels (300) is connected to the inner cavity of the box (100), the top of the gas channels (300) has a negative pressure pipeline connection port (310), a dehumidification box (400) is connected to the pipe of the gas channels (300) in a cross-section, and a dust filter assembly (500) is provided on the top of the inner side of the box (100). The gas in the box (100) enters the gas channel (300) after passing through the dust filter assembly (500). The box (100) has a discharge port (140) at the lowest point of its bottom. A spiral pusher (600) is fixed to the bottom of the outer side of the box (100), and the input end of the spiral pusher (600) corresponds to the discharge port (140).

2. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: The flexible fabric seat (200) includes a floating ring (210) located directly below the vertical section of the L-shaped slag discharge port conduit (110) and a flexible curtain (220) surrounding and connecting the floating ring (210) and the port of the vertical section of the L-shaped slag discharge port conduit (110).

3. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: The lower part of the gas channel (300) is also equipped with a butterfly valve (320), and the butterfly valve (320) is located below the dehumidification box (400).

4. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: The dehumidification box (400) has a moisture-absorbing filter element (410) horizontally inserted inside. The dehumidification box (400) has a replacement port and a door panel (420) corresponding to the replacement port on one side.

5. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: The dust filter assembly (500) includes vertical partitions (510) fixed to the top sides of the inner side of the housing (100), positioning slots (5101) located on opposite sides of the two vertical partitions (510), a filter screen (520) horizontally inserted into the inner side of the positioning slot (5101), and a replacement port opened on one side of the housing (100) and a sealing plate (530) corresponding to the replacement port. The filter plate (520) is located directly below the two gas channels (300), and the front and rear ends of the two vertical partitions (510) are fixedly connected to the inner side wall of the box (100).

6. A gas overflow prevention device for coal mine gas drainage boreholes according to claim 2, characterized in that: During operation, the bottom of the floating ring (210) floats and adheres to the liquid surface, and the bottom of the vertical section of the L-shaped water outlet pipe (120) is located below the liquid surface and above the coal slag deposit layer.

7. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: The inner side of the box (100) has several chute plates (130), and multiple chute plates (130) form an enclosed coal slag sedimentation trough. The discharge port (140) is located at the lowest point of the coal slag sedimentation trough.

8. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: An observation window (160) is also provided on one side of the enclosure (100), and the inside of the observation window (160) has tempered glass (170).

9. The gas spill-proof device for coal mine gas extraction drilling according to claim 1, characterized in that: The box (100) also has support legs (150) at the four corners of its bottom.

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