Gas-liquid separator for coal bed gas drainage and production well

Abstract

The invention relates to the technical field of gas-liquid separation, in particular to a gas-liquid separator for a coal bed gas drainage and production well, which comprises a tank body, and a motor, a wire mesh demister, a first rotary separator, a second rotary separator and a flapping dispersion assembly which are in transmission connection are sequentially arranged in the inner space and the outer space of the tank body from top to bottom; the motor is detachably mounted at the top of the external space of the tank body; the wire mesh demister is positioned at the top of the internal space of the tank body; the device has the beneficial effects that the rotary separators are arranged in the tank body up and down, the motor is mounted outside the tank body, the power of the motor is transmitted to the rotary separators to control the rotary separators to rotate, the structural characteristics of the rotary separators are utilized, tiny liquid drops in gas are removed after the rotary separators are in contact with rising gas, continuous rising of the gas is not affected, and the device is suitable for large-scale industrial production. Meanwhile, the liquid drops adhered to the rotary separator are thrown to the side wall of the tank body, so that the descending liquid slides down along the side wall of the tank body and is prevented from being in contact with the ascending gas, and the gas-liquid separation load is reduced.

Description

Technical Field

[0001] This invention relates to the field of gas-liquid separation technology, specifically to a gas-liquid separator for coalbed methane drainage wells. Background Technology

[0002] Coalbed methane, as a clean and efficient unconventional natural gas resource, requires gas-liquid separators during its extraction to separate natural gas from formation water, coal dust, and other impurities. This is a crucial step in ensuring natural gas quality and preventing pipeline corrosion and ice blockage. Gravity separators, due to their simple structure, stable operation, and large processing capacity, have become one of the mainstream equipment for gas-liquid separation in coalbed methane drainage wells.

[0003] To improve the accuracy of gas-liquid separation, existing gravity separators typically have multiple umbrella-shaped separators arranged vertically within the casing. The collision and coalescence of the umbrellas capture tiny droplets that have not settled in the gas. Specifically, the tiny droplets carried by the gas come into contact with the surface of the umbrella, detach from the airflow, and condense into larger droplets on the umbrella. Then, they fall to the liquid collection area at the bottom of the separator under gravity, thus achieving a second separation of gas and liquid.

[0004] However, in actual coalbed methane extraction operations, the gravity separators described above still have significant technical defects: for example, during the falling of large droplets formed by the condensation of the umbrella plate separator, they will come into reverse contact with the upward-flowing natural gas inside the separator. Some of the large droplets are easily re-entrained by the high-speed rising airflow, causing the condensed liquid to mix back into the gas. This not only increases the processing load of the subsequent umbrella plate separator, but also directly increases the humidity of the gas, making it difficult for the finally separated natural gas to reach the ideal dryness standard.

[0005] Therefore, considering the problem of secondary droplet entrainment in existing gravity separators with umbrella-plate separators, and taking into account the special operating conditions of coalbed methane with high water and high coal powder content, there is an urgent need to develop a gas-liquid separator that can prevent the formation of large droplets from coming into reverse contact with rising gas, in order to meet the requirements for gas-liquid separation accuracy and stable equipment operation during coalbed methane drainage. Summary of the Invention The purpose of this invention is to provide a gas-liquid separator for coalbed methane drainage wells to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gas-liquid separator for coalbed methane drainage wells, comprising a tank, wherein a motor, a wire mesh demister, a first rotary separator, a second rotary separator, and a beater dispersion assembly are sequentially arranged from top to bottom in the inner and outer spaces of the tank. The motor is detachably installed at the top of the outer space of the tank, the wire mesh demister is located at the top of the inner space of the tank and below the exhaust port of the tank, and the beater dispersion assembly is located in the inner space of the tank and below the feed inlet. The motor drives the beater dispersion assembly to impact the material entering the tank, achieving initial dispersion of liquid and gas. The first rotary separator and the second rotary separator further separate the liquid and gas, and accelerate the gas upward while simultaneously throwing the liquid toward the side wall of the tank.

[0007] Preferably, the first rotary separator includes a support, a limiting device rotatably mounted on the support, and multiple rotating blades distributed outside the limiting device. The multiple rotating blades are all connected to the limiting device, and each rotating blade is in an inclined state. When viewed from above, two adjacent rotating blades partially overlap.

[0008] Preferably, the support includes a horizontal plate and a central shaft that passes through the horizontal plate and is connected by a bearing. A notch is provided at the end of the horizontal plate, and an ear plate is provided at the notch. The ear plate is fixedly connected to the side wall of the tank.

[0009] Preferably, a threaded column, a plum blossom column, and a tray are fixedly arranged vertically on the central shaft. A first nut is sleeved on the threaded column, a limiting device is sleeved on the plum blossom column, and the limiting device 20 is placed on the tray. The first nut presses down on the limiting device.

[0010] Preferably, the limiting device includes a top plate, an upper plate, and a lower plate. The upper and lower plates have multiple slots along their circumferential direction at their edges close to each other's sidewalls, and multiple insertion holes are provided on the edges of the upper and lower plates. A post installed below the top plate is inserted into two opposite insertion holes. The slots are in an inclined state, and the end of the rotating blade is inserted into the two interconnected slots, and the post is inserted into the channel at the end of the rotating blade.

[0011] Preferably, a gear set is connected to the top of the beat-dispersing component, the top frame of the gear set is connected to the cross plate of the second rotary separator, and the plug-in post installed at the bottom of the central shaft of the second rotary separator is inserted into the power input shaft of the gear set; the beat-dispersing component includes a central tube and multiple beat discs evenly installed on the outside of the central tube, the central tube is sleeved on the power output shaft of the gear set, and the gear set drives the multiple beat discs to move sequentially to the bottom of the feed inlet to beat the material.

[0012] Preferably, the wire mesh demister includes a cylinder, multiple wire meshes stacked inside the cylinder, and a grid plate located at the top of the cylinder. The bottom of the cylinder is configured as a grid structure, and a vertical pipe is fixedly installed inside the cylinder. The wire meshes and grid plate are configured as annular structures. The end of the vertical pipe protruding from the grid plate is threaded with a second nut, and the lower second nut presses down on the grid plate.

[0013] Preferably, a drive shaft assembly is provided through the wire mesh demister. The drive shaft assembly includes a first shaft and a second shaft that are connected vertically. A retaining pin installed inside the first shaft is located in a retaining groove of the second shaft. The second shaft is connected through the vertical tube via a bearing, and the first shaft is connected to the central shaft via a coupling.

[0014] Preferably, a support frame is provided above the wire mesh demister. The support frame includes a mortise plate and an annular plate installed on the top of the mortise plate. The annular plate is located in an annular groove at the top of the tank and is pressed down by an inspection cover installed on the top of the tank. A connecting hole is provided at the bottom of the mortise plate, and the top of the vertical pipe passes through the connecting hole, which is located between two upper and lower second nuts.

[0015] Preferably, a third shaft is connected to the inner side of the plate via a bearing, and a polygonal top shaft is fixedly installed on the top of the third shaft. A sleeve is detachably fitted on the top shaft, and a connecting shaft installed on the top of the sleeve passes through the inspection cover. The connecting shaft is connected to a motor installed above the inspection cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention has rotary separators installed at the top and bottom of the tank body, and a motor installed outside the tank body. The power of the motor is transmitted to the rotary separator to control its rotation. Utilizing the structural characteristics of the rotary separator, after contacting the rising gas, it removes tiny droplets from the gas without affecting the continued rise of the gas. At the same time, it throws the droplets adhering to the rotary separator onto the side wall of the tank body, so that the descending liquid slides down the side wall of the tank body, avoiding contact with the rising gas and reducing the gas-liquid separation load.

[0017] 2. In this invention, a beater-dispersing component is installed below the rotary separator via a gear set. When the motor rotates the rotary separator, it drives the beater-dispersing component to rotate at high speed and impact the material entering the tank, thereby achieving preliminary separation of gas and liquid. Attached Figure Description

[0018] Figure 1 This is a first structural schematic diagram of the entire invention; Figure 2 This is a schematic diagram of the second structure of the present invention as a whole; Figure 3 This is a schematic diagram of the third structure of the entire invention; Figure 4 This is a schematic diagram of the structure of the first rotary separator of the present invention; Figure 5 This is a schematic diagram of the structure of the bracket of the present invention; Figure 6 This is a schematic diagram of the structure of the limiting device of the present invention; Figure 7 This is a schematic diagram of the structure of the beat-dispersing component and the second rotary separator of the present invention; Figure 8 This is a schematic diagram of the structure of the beat-and-disperde component of the present invention; Figure 9 This is a schematic diagram of the structure of the wire mesh demister of the present invention; Figure 10 This is a schematic diagram of the transmission shaft of the present invention; Figure 11 This is a schematic diagram of the structure of the motor and the inspection cover of the present invention; Figure 12 This is a schematic diagram of the support frame of the present invention; Figure 13 This is a schematic diagram of the structure of the annular plate and the tank body of the present invention.

[0019] The components represented by each number in the attached diagram are listed below: 1. Tank body; 2. Beating and dispersing assembly; 3. First rotary separator; 4. Wire mesh demister; 5. Motor; 6. Inspection cover; 7. Support frame; 8. Drive shaft assembly; 9. Second rotary separator; 10. Rotating blade; 11. Bracket; 12. Horizontal plate; 13. Central shaft; 14. Notch; 15. Ear plate; 16. Tray; 17. Plum blossom column; 18. Threaded column; 19. First nut; 20. Restricting device; 21. Top plate; 22. Insert column; 23. 24. Upper plate; 25. Groove; 26. Plum blossom hole; 27. Lower plate; 28. Insert post; 29. ​​Gear set; 30. Top frame; 31. Beating plate; 32. Center tube; 33. Cylinder; 34. Wire mesh; 35. Grid plate; 36. Second nut; 37. Vertical tube; 38. First shaft; 39. Second shaft; 40. Slot; 41. Snap post; 42. Mounting bracket; 43. Connecting shaft; 44. Sleeve; 45. Chamfer; 46. Third shaft; 47. Connecting hole; 48. Annular plate; 49. Top shaft. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention provides a technical solution: In order to avoid the liquid that has been removed coming into reverse contact with the rising gas and being entrained in the gas, thus increasing the processing load, this embodiment proposes a new gas-liquid separator based on the existing gravity separator.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, the gas-liquid separator includes a tank 1, a motor 5, a wire mesh demister 4, a first rotary separator 3, a second rotary separator 9, and a beater dispersion assembly 2. The tank 1 has the same structure as an existing gravity separator, or in other words, the difference between this gas-liquid separator and an existing gravity separator lies in the motor 5, the wire mesh demister 4, the first rotary separator 3, the second rotary separator 9, and the beater dispersion assembly 2.

[0023] like Figure 1 , Figure 3 As shown, the motor 5, wire mesh demister 4, first rotary separator 3, second rotary separator 9, and beater dispersion assembly 2 are arranged vertically. The motor 5 is located at the top of the external space of the tank 1, and the motor 5 is mounted on the inspection cover 6 on the top of the tank 1. The wire mesh demister 4, the first rotary separator 3, the second rotary separator 9, and the beater dispersion assembly 2 are all located inside the tank 1. The wire mesh demister 4 is located below the exhaust port of the tank 1, and the beater dispersion assembly 2 is located in the inner space of the tank 1 and below the feed inlet. At the same time, the motor 5 is connected to the first rotary separator 3 through the drive shaft assembly 8 that passes through the wire mesh demister 4. When the motor 5 is working, it drives the first rotary separator 3, the second rotary separator 9, and the beater dispersion assembly 2 to rotate. During the rotation of the beater dispersion assembly 2, it impacts the material entering the tank 1, thereby initially dispersing the liquid and gas. The rising gas contacts the first rotary separator 3 and the second rotary separator 9 in sequence, separating the liquid and gas again and accelerating the gas to rise. At the same time, it flings the liquid adhering to the rotary separator towards the side wall of the tank 1, changing the situation where the liquid falls freely and contacts the rising gas.

[0024] like Figure 4As shown, the first rotary separator 3 includes a support 11, a limiting device 20 rotatably mounted on the support 11, and multiple rotating blades 10 distributed outside the limiting device 20. Each rotating blade 10 is connected to the limiting device 20, and each rotating blade 10 is in an inclined state, with adjacent rotating blades 10 partially overlapping in a top-view angle. Furthermore, the support 11 is fixedly connected to the side wall of the tank 1, thus supporting the stable installation of the limiting device 20 and the multiple rotating blades 10, facilitating the rotation of the rotating blades 10 by the motor 5. In a top-view angle, the multiple rotating blades 10 cover the channel for the rising gas. When the rising gas comes into contact with the rotating blades 10, tiny droplets condense on the blades 10. Simultaneously, the droplets rotate with the rotating blades 10, then are flung towards the side wall of the tank 1, finally sliding down the side wall. Because the rotating blades 10 are in an inclined state, there are gaps between adjacent rotating blades 10, providing a channel for the gas to pass through the rotary separator. Additionally, the rotation of the rotating blades 10 accelerates the upward speed of the gas.

[0025] The structure of the second rotary separator 9 is the same as that of the first rotary separator 3, the only difference being that a plug-in post 27 is installed at the bottom of the central shaft 13 of the second rotary separator 9. In addition, the central shafts 13 of the first rotary separator 3 and the second rotary separator 9, which are distributed vertically, are connected by a coupling.

[0026] like Figure 5 As shown, specifically, the support 11 includes a horizontal plate 12 and a central shaft 13 that passes through the horizontal plate 12 via a bearing. A notch 14 is provided at the end of the horizontal plate 12, and an ear plate 15 is provided at the notch 14. The ear plate 15 is fixedly connected to the side wall of the tank 1. During assembly, the horizontal plate 12 is connected to the ear plate 15, so that the horizontal plate 12 can be stably installed in the tank 1 with the support of the ear plate 15.

[0027] like Figure 5 As shown, in order to make the multiple rotating blades 10 rotate with the central shaft 13 under the action of the limiting device 20, threaded columns 18, plum blossom columns 17 and trays 16 are fixedly arranged on the central shaft 13. A first nut 19 is sleeved on the threaded column 18, the limiting device 20 is sleeved on the plum blossom column 17 and supported on the tray 16. The first nut 19 presses down on the limiting device 20. Therefore, the limiting device 20 is relatively statically connected to the central shaft 13, which facilitates the limiting device 20 to drive the rotating blades 10 to rotate synchronously with the central shaft 13.

[0028] like Figure 6As shown, the limiting device 20 includes a top plate 21, an upper tray 23, and a lower tray 26. Both the upper tray 23 and the lower tray 26 have a perforated hole 25 in their center, and multiple slots 24 are provided along their circumference at the edges of their respective sidewalls. These slots 24 are inclined, and multiple insertion holes are provided along the edges of both trays. When assembling the limiting device 20 and the rotating blade 10, the end of the rotating blade 10 is inserted into two interconnected slots 24, and a post 22 installed below the top plate 21 is inserted into two directly opposite insertion holes. The post 22 is also inserted into the channel at the end of the rotating blade 10, thus limiting the position of the rotating blade 10 relative to the upper tray 23 and the lower tray 26. When the limiting device 20 is installed on the central shaft 13, the plum blossom post 17 is set through the plum blossom hole 25, the bottom of the insert post 22 is inserted into the insertion hole of the tray 16, and then the first nut 19 presses down the top plate 21 to make the upper plate 23 and the lower plate 26 stably installed relative to the tray 16.

[0029] like Figure 7 As shown, in order to transmit the power of the second rotary separator 9 to the beat-and-disperde assembly 2 and to make the rotational speed of the beat-and-disperde assembly 2 greater than that of the second rotary separator 9, a gear set 28 is connected to the top of the beat-and-disperde assembly 2. The top frame 29 of the gear set 28 is connected to the cross plate 12 of the second rotary separator 9, and the insertion post 27 installed at the bottom of the central shaft 13 of the second rotary separator 9 is inserted into the power input shaft of the gear set 28. The beat-and-disperde assembly 2 is installed on the power output shaft of the gear set 28. Therefore, the beat-and-disperde assembly 2 can be driven to rotate at high speed under the action of the gear set 28.

[0030] like Figure 8 As shown, in order to beat and disperse the incoming material, the beating and dispersing component 2 includes a central tube 31 and multiple beating discs 30 evenly installed on the outside of the central tube 31. The central tube 31 is sleeved on the power output shaft of the gear set 28, and the gear set 28 drives the multiple beating discs 30 to move sequentially to the bottom of the feed inlet to beat the material.

[0031] like Figure 9 As shown, to facilitate the installation of the drive shaft assembly 8 and simultaneously remove liquid droplets from the gas, the wire mesh demister 4 includes a cylinder 32, multiple wire meshes 33 stacked vertically inside the cylinder 32, and a grid plate 34 located at the top of the cylinder 32. The bottom of the cylinder 32 is configured with a grid structure, and a vertical pipe 36 is fixedly installed inside the cylinder 32. The wire meshes 33 and the grid plate 34 are arranged in annular structures. A second nut 35 is threaded onto the protruding end of the vertical pipe 36 from the grid plate 34. The lower second nut 35 presses down on the grid plate 34, thereby restricting the stable installation of the wire meshes 33 relative to the cylinder 32 under the action of the grid plate 34. When assembling the drive shaft assembly 8 and the wire mesh demister 4, the drive shaft assembly 8 passes through the vertical pipe 36, and the drive shaft assembly 8 is mechanically sealed to the vertical pipe 36.

[0032] like Figure 12 , Figure 13 As shown, to stably install the wire mesh demister 4 inside the tank 1, a support frame 7 is provided above the wire mesh demister 4. The support frame 7 includes a flange 44 and an annular plate 47 installed on top of the flange 44. The annular plate 47 is located in an annular groove at the top of the tank 1, and the inspection cover 6 installed on the top of the tank 1 presses down on the annular plate 47, forcing the support frame 7 to be stably installed on the top of the tank 1. A connecting hole 46 is provided at the bottom of the flange 44, and the top of the vertical pipe 36 passes through the connecting hole 46. The connecting hole 46 is located between the upper and lower second nuts 35, realizing a stable and detachable connection between the wire mesh demister 4 and the support frame 7, thereby controlling the stable installation of the wire mesh demister 4 inside the tank 1.

[0033] like Figure 11 As shown, to transmit the power of motor 5 to the rotary separator, a third shaft 45 is connected to the inner side of plate 44 via bearings. A polygonal top shaft 48 is fixedly installed on the top of the third shaft 45. A sleeve 43 is detachably fitted onto the top shaft 48. A connecting shaft 42, mechanically sealed and installed on the top of the sleeve 43, penetrates the inspection cover 6. The connecting shaft 42 is connected to the motor 5 installed above the inspection cover 6. The motor 5 is mounted on the inspection cover 6 via a mounting bracket 41. Therefore, under the drive of the connecting shaft 42, the third shaft 45 can be rotated, providing support for power transmission. In addition, the top shaft 48 and the sleeve 43 are plugged together, which does not affect the disassembly and assembly of the inspection cover 6.

[0034] like Figure 10 As shown, the transmission shaft assembly 8 includes a first shaft 37 and a second shaft 38 that are connected vertically. The retaining pin 40 installed inside the first shaft 37 is located in the retaining groove 39 of the second shaft 38. The second shaft 38 is connected through the vertical tube 36 via a bearing, and the top of the second shaft 38 is connected to the third shaft 45 via a coupling. The first shaft 37 is connected to the central shaft 13 via a coupling.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid separator for coal-bed gas drainage well, comprising a tank body (1), characterized in that: The motor (5) is detachably installed on the top of the outer space of the tank body (1), the wire mesh demister (4) is located on the top of the inner space of the tank body (1), and the wire mesh demister (4) is located below the exhaust port of the tank body (1), and the beating dispersion assembly (2) is located in the inner space of the tank body (1) and below the feed inlet; the motor (5) drives the beating dispersion assembly (2) to impact the material dispersion liquid and gas entering the tank body (1), the first rotary separator (3) and the second rotary separator (9) separate the liquid and gas again, and accelerate the gas to rise, while the liquid is thrown to the side wall of the tank body (1).

2. The gas-liquid separator for coal-bed gas production well according to claim 1, characterized in that: The first rotary separator (3) comprises a support (11), a limiting device (20) rotatably arranged on the support (11), and a plurality of rotating leaves (10) distributed outside the limiting device (20), wherein each rotating leaf (10) is connected with the limiting device (20), and each rotating leaf (10) is in an inclined state, and two adjacent rotating leaves (10) partially overlap in a top view.

3. The gas-liquid separator for coalbed methane production well according to claim 2, characterized in that: The support (11) comprises a horizontal plate (12) and a central shaft (13) penetrating through the horizontal plate (12) and connected by a bearing, a notch (14) is arranged at the end of the horizontal plate (12), and an ear plate (15) is arranged at the notch (14) and fixedly connected with the side wall of the tank body (1).

4. The gas-liquid separator for coal-bed gas production well according to claim 3, characterized in that: A threaded column (18), a plum blossom column (17) and a tray (16) are fixedly arranged on the central shaft (13) in an up-down distribution, a first nut (19) is sleeved on the threaded column (18), the limiting device (20) is sleeved on the plum blossom column (17), and the limiting device (20) is supported on the tray (16), and the first nut (19) presses down the limiting device (20).

5. The gas-liquid separator for coalbed methane production well according to claim 4, characterized in that: The limiting device (20) comprises a top plate (21), an upper puzzle plate (23) and a lower puzzle plate (26), a plurality of puzzle grooves (24) are arranged on the edges of the upper and lower puzzle plates (23) and (26) along the circumferential direction of the edges, a plurality of insertion holes are arranged on the edges of the upper and lower puzzle plates (23) and (26), and an insertion column (22) installed below the top plate (21) is inserted into two insertion holes opposite to each other; the puzzle grooves (24) are in an inclined state, the ends of the rotating leaves (10) are inserted into two puzzle grooves (24) opposite to each other, and the insertion column (22) is inserted into the hole of the end of the rotating leaf (10); the plum blossom column (17) penetrates the plum blossom holes (25) of the upper and lower puzzle plates (23) and (26).

6. The gas-liquid separator for coal-bed gas production well according to claim 1, characterized in that: A gear set (28) is connected to the top of the beating dispersion assembly (2), the top frame (29) of the top of the gear set (28) is connected with the cross plate (12) of the second rotary separator (9), and the plug-in column (27) installed at the bottom of the central shaft (13) of the second rotary separator (9) is inserted into the power input shaft of the gear set (28); the beating dispersion assembly (2) comprises a central pipe (31) and a plurality of beating discs (30) evenly installed outside the central pipe (31), the central pipe (31) is sleeved on the power output shaft of the gear set (28), and the gear set (28) drives the plurality of beating discs (30) to move to the below of the feeding port in turn to beat the material.

7. The gas-liquid separator for coal-bed gas production well according to claim 1, characterized in that: The wire mesh demister (4) comprises a cylinder (32), a plurality of wire meshes (33) stacked up and down inside the cylinder (32), and a grid plate (34) located at the top of the cylinder (32), the bottom of the cylinder (32) is provided with a grid structure, the inside of the cylinder (32) is fixedly provided with a vertical pipe (36), and the wire mesh (33) and the grid plate (34) are provided in an annular structure; the end of the vertical pipe (36) protruding from the grid plate (34) is threadedly sleeved with a second nut (35) up and down, and the second nut (35) on the lower side presses the grid plate (34).

8. The gas-liquid separator for coalbed methane production well according to claim 7, characterized in that: A transmission shaft set (8) is provided through the wire mesh demister (4), the transmission shaft set (8) comprises a first shaft body (37) and a second shaft body (38) connected by being inserted up and down, a clamping column (40) installed inside the first shaft body (37) is located in a clamping groove (39) of the second shaft body (38); the second shaft body (38) is connected through a bearing and penetrates the vertical pipe (36), and the first shaft body (37) is connected with the central shaft (13) through a shaft coupling.

9. The gas-liquid separator for coalbed methane production well according to claim 7, characterized in that: A support frame (7) is provided above the wire mesh demister (4), the support frame (7) comprises a Z-shaped plate (44) and an annular plate (47) installed at the top of the Z-shaped plate (44); the annular plate (47) is located in an annular groove at the top of the tank body (1), and a maintenance cover (6) installed at the top of the tank body (1) presses the annular plate (47); a through hole (46) is provided at the bottom of the Z-shaped plate (44), the top of the vertical pipe (36) penetrates the through hole (46), and the through hole (46) is located between the two second nuts (35) up and down.

10. The gas-liquid separator for coalbed methane production well according to claim 9, characterized in that: A third shaft body (45) is provided inside the Z-shaped plate (44) through a bearing connection, a top shaft (48) with a polygonal structure is fixedly provided at the top of the third shaft body (45), a sleeve (43) is detachably sleeved at the top shaft (48), a connecting shaft (42) installed at the top of the sleeve (43) penetrates the maintenance cover (6), the connecting shaft (42) is connected with the power output shaft of the motor (5), and the motor (5) is installed above the maintenance cover (6) through a mounting frame (41).

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