A drainage gas recovery device for coal bed gas development

Abstract

This utility model discloses a drainage and gas extraction device for coalbed methane development, comprising a drainage box, with connecting pipes welded to both sides of the drainage box for connecting to gas extraction pipelines, a sealing cover screwed onto the top of the drainage box, a filter element for filtering impurities installed inside the sealing cover via an installation component, and a brush for cleaning the filter element installed below the sealing cover. The connecting pipes on both sides of the drainage box are used to connect to the gas extraction pipelines. Under the influence of gravity, gas, liquid, and solid are separated. The liquid and solid fall into the drainage box due to gravity, while the gas still contains moisture and suspended particles. The filter element can perform multiple purifications on the water vapor and suspended particles. After purification, the gas flows through another connecting pipe, and the brush element can clean the inside and outside of the filter element.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane development, specifically a drainage gas extraction device for coalbed methane development. Background Technology

[0002] Coalbed methane, as a highly efficient and clean unconventional natural gas resource, is of great strategic significance for ensuring energy security and reducing greenhouse gas emissions. During the development of coalbed methane, coal seams are usually accompanied by a large amount of groundwater, which occupies the pore space of the coal seam and increases the resistance to gas flow, resulting in a significant decrease in coalbed methane production. Therefore, drainage gas extraction has become the core technical means for coalbed methane development.

[0003] Currently, existing drainage gas extraction devices in the market and in practical applications have many defects in structural design and functional implementation, making it difficult to meet the needs of efficient and high-quality coalbed methane development. Most existing drainage gas extraction devices rely solely on simple water-gas separation chambers or single-layer filter structures for gas collection. Their separation and filtration principles are relatively crude and cannot effectively remove tiny water droplets and native coal seam impurities (such as coal dust and rock fragments) carried in the gas. Furthermore, existing devices generally lack a targeted scraping and cleaning structure. When the filter structure becomes clogged, operators must stop the machine and disassemble the outer shell to clean the filter structure. This operation is cumbersome and time-consuming, seriously affecting the continuity of coalbed methane extraction and increasing production interruption costs.

[0004] Furthermore, the existing filter structures mostly adopt integrated connection methods such as welding and bolt fixing. When the filter structure is damaged due to long-term use, the filtration efficiency cannot meet the requirements, or it is severely blocked and needs to be replaced, the staff need to use professional tools to remove multiple fixed parts. The entire disassembly and assembly process not only consumes a lot of manpower and time, but may also damage other parts of the device (such as sealing structure, connecting pipes, etc.) due to improper operation.

[0005] Secondly, the drainage structure lacks solid-liquid separation function, and the sewage discharge pollutes the environment. The existing drainage structure of the device generally adopts the direct drainage design. Since coal seam water contains not only a large amount of solid impurities such as coal dust and rock fragments, the long-term accumulation of solid impurities in the sewage will block the drainage pipes. Therefore, it is necessary to design a drainage gas extraction device for coalbed methane development to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a drainage gas extraction device for coalbed methane development, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a drainage gas extraction device for coalbed methane development, comprising a drainage box, connecting pipes for connecting gas extraction pipelines welded to both sides of the drainage box, a sealing cover screwed onto the top of the drainage box, a filter element for filtering impurities installed inside the sealing cover via an installation component, a brush element for cleaning the filter element installed below the sealing cover, and a drainage component for solid-liquid separation installed inside the drainage box near the lower middle part.

[0008] Preferably, the mounting component includes a motor mounted on the top of the sealing cover, a rotating shaft mounted on the bottom of the motor via an output shaft, a mounting plate screwed onto the bottom of the rotating shaft, a support plate screwed onto the bottom of the rotating shaft and located at the bottom of the mounting plate, and a nut for anti-reverse limiting screwed onto the bottom of the rotating shaft.

[0009] Preferably, the filter element includes a first gasket placed on top of the mounting plate, a second gasket embedded inside the mounting plate near its edge, a filter cartridge placed outside the rotating shaft on one side of the first gasket, a filter plate placed on top of the second gasket, and both the filter cartridge and the filter plate being embedded in the bottom of the sealing cap for fixation.

[0010] Preferably, the brush actuator includes a plurality of first scraper strips arranged circumferentially and bolted to the outside of the rotating shaft, a plurality of fixed posts arranged in an arc are screwed to the top of the mounting plate, and second scraper strips are respectively inserted and installed on both sides of the fixed posts, the second scraper strips being located between the filter cartridge and the filter plate.

[0011] Preferably, the drainage component includes a drainage pipe extending through one side of the drainage box and near its edge, a filter pad is embedded inside the drainage box, and a control valve is installed at the bottom of the drainage box.

[0012] Preferably, the drainage box has a flow guide section on its inner side and near the lower middle part.

[0013] Preferably, a sealing gasket is placed between the sealing cover and the top of the drain box.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The connecting pipes on both sides of the drain box are used to connect the gas collection pipeline. Due to gravity, gas, liquid and solid are separated. The gas flows through the top of the drain box to the other connecting pipe, while the liquid and solid fall into the drain box due to gravity. However, moisture and suspended particles will remain in the gas. The filter can perform multiple purifications on the water vapor and suspended particles. After purification, the gas flows through the other connecting pipe. The brush can clean the inside and outside of the filter by brushing to prevent the accumulation of particles and water vapor from clogging the filter or affecting the gas collection effect.

[0015] 2. The mounting plate and the pad are slidably connected. The mounting plate is inserted into the bottom of the rotating shaft and screwed in. The support plate is screwed in to the rotating shaft to support the mounting plate. The support plate is fixed by screwing the nut into the rotating shaft. The support plate is inserted into the locking groove through the locking pin at the top of the rotating ring, so that the support plate locks the mounting plate through the locking pin. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a left-side sectional perspective view of the overall structure of this utility model; Figure 3 This is a front sectional perspective view of the overall structure of this utility model; Figure 4 The overall structure of this utility model Figure 2 Enlarged view of point A in the middle.

[0017] In the diagram: 1. Drain box; 2. Connecting pipe; 3. Sealing cover; 4. Motor; 5. Rotating shaft; 6. Mounting plate; 7. Support plate; 8. First gasket; 9. Second gasket; 10. Filter cartridge; 11. Filter plate; 12. First scraper; 13. Fixing column; 14. Second scraper; 15. Drain pipe; 16. Filter pad; 17. Flow guide; 18. Sealing gasket. Detailed Implementation

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

[0019] Example 1 Please refer to Figure 1-4 As shown, this utility model provides a drainage gas extraction device for coalbed methane development, including a drainage box 1. Connecting pipes 2 for connecting gas extraction pipelines are welded to both sides of the drainage box 1. A sealing cover 3 is screwed onto the top of the drainage box 1. A filter element for filtering impurities is installed inside the sealing cover 3 through an installation component. A brush element for cleaning the filter element is installed below the sealing cover 3. A drainage component for solid-liquid separation is installed inside the drainage box 1 near the middle and lower part. A sealing gasket 18 is placed between the sealing cover 3 and the top of the drainage box 1.

[0020] Additionally, the sealing gasket 18 improves the sealing between the drain box 1 and the sealing cover 3. The connecting pipes 2 on both sides of the drain box 1 are used for gas collection pipeline connection. Due to gravity, gas, liquid, and solid are separated. The gas flows from the top of the drain box 1 to the other connecting pipe 2, while the liquid and solid fall into the drain box 1 due to gravity. However, moisture and suspended particles will remain in the gas. The filter element can perform multiple purifications on the water vapor and suspended particles. After purification, the gas flows through the other connecting pipe 2. The brushing element can clean the inside and outside of the filter element to prevent the accumulation of particles and water vapor from clogging the filter element or affecting the gas collection effect.

[0021] Specifically, the mounting components include a motor 4 mounted on the top of the sealing cover 3, a rotating shaft 5 mounted on the bottom of the motor 4 via an output shaft, a mounting plate 6 screwed onto the bottom of the rotating shaft 5, a support plate 7 screwed onto the bottom of the rotating shaft 5 and located at the bottom of the mounting plate 6, and a nut for anti-reverse limiting screwed onto the bottom of the rotating shaft 5.

[0022] The mounting plate 6 and the pad are slidably connected. The mounting plate 6 is inserted into the bottom of the rotating shaft 5 and screwed in. The support plate 7 is screwed in to the rotating shaft 5 to support the mounting plate 6. The support plate 7 is fixed by screwing the nut into the rotating shaft 5. The support plate 7 is inserted into the locking groove through the locking pin at the top of the rotating ring, so that the support plate 7 locks the mounting plate 6 through the locking pin.

[0023] More specifically, the filter element includes a first gasket 8 placed on top of the mounting plate 6, a second gasket 9 embedded inside the mounting plate 6 near the edge, a filter cartridge 10 placed outside the rotating shaft 5 on one side of the first gasket 8, a filter plate 11 placed on top of the second gasket 9, and both the filter cartridge 10 and the filter plate 11 are embedded in the bottom of the sealing cover 3 for fixation.

[0024] It should be added that the filter cartridge 10 is annular and filled with adsorption materials such as activated carbon. The filter plate 11 is arc-shaped and is tightly fitted to one end of one of the connecting pipes 2. The filter cartridge 10 and the filter plate 11 are fixed by inserting them into one side of the sealing cover 3. The filter cartridge 10 and the filter plate 11 are then clamped and limited by the first gasket 8 and the second gasket 9 on one side of the mounting plate 6. The filter cartridge 10 adsorbs and filters suspended particles and liquids in the gas, and the filter plate 11 can further purify and filter residual liquid moisture and small particulate impurities.

[0025] Furthermore, the brush actuating component includes a plurality of first scraper strips 12 arranged in a circular pattern and bolted to the outside of the rotating shaft 5. A plurality of fixed posts 13 arranged in an arc are screwed to the top of the mounting plate 6. Second scraper strips 14 are inserted and installed on both sides of the fixed posts 13 respectively. The second scraper strips 14 are located between the filter cartridge 10 and the filter plate 11.

[0026] Furthermore, the mounting plate 6 and the support plate 7 are provided with multiple interconnected drainage holes so that impurities can be discharged downwards. The rotating shaft 5 can drive multiple first brush strips to scrape the impurities and water vapor inside the filter cylinder 10. After the water vapor and impurities are cleaned, they fall and are discharged through the mounting plate 6 and the support plate 7. The second scraper strips 14 on both sides of the fixed column 13 scrape and clean the outside of the filter cylinder 10 and the inside of the filter plate 11 respectively, so as to prevent water vapor or impurities from accumulating and causing them to accumulate or block.

[0027] The drainage component includes a drain pipe 15 that runs through one side of the drainage box 1 and is close to the edge. A filter pad 16 is embedded inside the drainage box 1. A control valve is installed at the bottom of the drainage box 1. A flow guide 17 is integrally formed inside the drainage box 1 and near the middle and lower part. The flow guide 17 can guide the aqueous solution and solid impurities downward. The control valve can prevent water carried by solid impurities from falling. The filter pad 16 can purify and filter the impurities in the aqueous solution to achieve the effect of solid-liquid separation. After solid-liquid separation, the liquid is discharged through the drain pipe 15, and the solid particulate impurities left by the filter pad 16 fall and are discharged from the bottom of the drainage box 1.

[0028] Working principle: First, the gas enters the drain box 1 through a connecting pipe 2. The liquid and solid fall into the drain box 1 due to gravity. However, there will still be moisture and suspended particles in the gas. At this time, the filter cartridge 10 adsorbs and filters the suspended particles and liquid in the gas. Then, the filter plate 11 further purifies and filters the remaining liquid moisture and small particulate impurities. Then, the purified gas flows through the drain box 1 to another connecting pipe 2. Next, the guide section 17 guides the aqueous solution and solid impurities downwards, and the filter pad 16 purifies and filters the impurities in the aqueous solution to achieve solid-liquid separation. Then, the liquid after solid-liquid separation is discharged through the drain pipe 15, and the solid particles impurities left by the filter pad 16 fall and are discharged below the drain box 1.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drainage gas recovery device for coal bed methane development, comprising a drainage box (1), characterized in that: The drainage box (1) has connecting pipes (2) welded on both sides for connecting to the gas collection pipeline. A sealing cover (3) is screwed onto the top of the drainage box (1). A filter element for filtering impurities is installed inside the sealing cover (3) through an installation component. A brush for cleaning the filter element is installed below the sealing cover (3). A drainage component for solid-liquid separation is installed inside the drainage box (1) near the middle and lower part.

2. The drainage gas recovery device for coal bed methane development according to claim 1, characterized in that: The mounting component includes a motor (4) mounted on the top of the sealing cover (3), a rotating shaft (5) mounted on the bottom of the motor (4) via an output shaft, a mounting plate (6) screwed onto the bottom of the rotating shaft (5), a support plate (7) screwed onto the bottom of the rotating shaft (5) and located at the bottom of the mounting plate (6), and a nut for anti-reverse limiting screwed onto the bottom of the rotating shaft (5).

3. The drainage gas recovery apparatus for coal bed methane development according to claim 2, characterized in that: The filter element includes a first gasket (8) placed on top of the mounting plate (6), a second gasket (9) embedded inside the mounting plate (6) near the edge, a filter cartridge (10) placed outside the rotating shaft (5) and on one side of the first gasket (8), and a filter plate (11) placed on top of the second gasket (9). Both the filter cartridge (10) and the filter plate (11) are embedded in the bottom of the sealing cover (3) for fixation.

4. The drainage gas recovery apparatus for coalbed methane development according to claim 3, characterized by: The brush actuator includes a plurality of first scraper strips (12) arranged in a circle and bolted to the outside of the rotating shaft (5). A plurality of fixed posts (13) arranged in an arc are screwed to the top of the mounting plate (6). Second scraper strips (14) are inserted and installed on both sides of the fixed posts (13). The second scraper strips (14) are located between the filter cartridge (10) and the filter plate (11).

5. A drainage gas extraction device for coalbed methane development according to claim 4, characterized in that: The drainage component includes a drain pipe (15) that runs through one side of the drainage box (1) and is close to the edge. A filter pad (16) is embedded inside the drainage box (1). A control valve is installed at the bottom of the drainage box (1).

6. A drainage gas extraction device for coalbed methane development according to claim 3, characterized in that: The drainage box (1) has a flow guide (17) on its inner side and near the middle and lower part.

7. A drainage gas extraction device for coalbed methane development according to claim 6, characterized in that: A sealing gasket (18) is placed between the sealing cap (3) and the top of the drain box (1).

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