Purification device for coal bed gas liquefaction

Abstract

The invention provides a purification device for coal bed gas liquefaction. The purification device comprises a rack, the bottom side of the rack is fixedly connected with a support, the top side of the rack is fixedly provided with a filter, and the side surface of the bottom end of the filter is provided with an injection pipe; the gas-water separation mechanism is mounted on the surface of the top side of the rack, and the gas-water separation mechanism is used for separating water in the coal bed gas filtered by the filter; the collecting mechanism is mounted on the surface of the top side of the rack; the filtering mechanism is mounted in the collecting mechanism, and the filtering mechanism is used for filtering impurities in the coal bed gas. Separated gas is filtered through the filtering mechanism, impurities in the gas are filtered again through the filtering mechanism, the impurities are collected through the collecting structure, follow-up treatment is facilitated, automatic adjusting and cleaning are achieved in the filtering process of the filtering mechanism, the filtering effect of the filtering mechanism is guaranteed, and the follow-up coal bed gas filtering efficiency is improved.

Description

Technical Field

[0001] The invention relates to a purification device, in particular to a purification device used for coal bed gas liquefaction. Background Art

[0002] Coalbed methane liquefaction and purification equipment is a professional equipment used to liquefy and purify coalbed methane. The composition of the coalbed methane liquefaction and purification equipment is complex and delicate, and each part plays an indispensable role. Through the coordinated work of these equipment, coalbed methane can be converted into high-quality liquefied coalbed methane products, contributing to the development of the energy field.

[0003] At present, there are many impurities in the existing coalbed methane. The purification and filtration effects of some existing coalbed methane liquefaction are not ideal. The impurities in the coalbed methane before liquefaction are not easy to separate, which increases the difficulty of workers' handling. At the same time, the moisture in the coalbed methane adheres to the filter net, which increases the adhesion effect of impurities and the filter net, reduces the filtration efficiency of the filter net, and affects its use. Summary of the invention

[0004] The present invention provides a purification device for coalbed methane liquefaction in order to solve the technical problems that some existing coalbed methane liquefaction has unsatisfactory purification and filtration effects, impurities in the coalbed methane before liquefaction are difficult to separate, which increases the difficulty of workers' handling, and moisture in the coalbed methane adheres to the filter net, increasing the adhesion effect of impurities and the filter net, reducing the filtration efficiency of the filter net and affecting the use.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a purification device for coalbed methane liquefaction, the purification device for coalbed methane liquefaction comprising:

[0007] A frame, wherein a support is fixedly connected to the bottom side of the frame, a filter is fixedly installed on the top side of the frame, and an injection pipe is installed on the bottom side surface of the filter;

[0008] A gas-water separation mechanism, which is installed on the top side surface of the frame and is used to separate water from the coalbed methane after being filtered by the filter;

[0009] A collecting mechanism, which is used to collect impurities in the coalbed methane and is installed on the top side surface of the frame;

[0010] A filtering mechanism is installed in the collecting mechanism and is used for filtering impurities in coalbed methane.

[0011] Furthermore, four supports are fixedly installed on the bottom side of the frame, and the four supports are located at four corners of the bottom side of the frame. A battery, a controller and a processor are installed on the surface of the frame.

[0012] Furthermore, the air-water separation mechanism includes a separation shell, an air intake pipe, a separation plate, a connecting pipe, spiral blades, a discharge pipe and an anti-backflow assembly, the separation shell is fixedly mounted on the top side surface of the frame, the left side of the top end of the separation shell is connected to the filter through the air intake pipe, a connecting pipe is fixedly mounted on the inner wall of the top side of the separation shell, spiral blades are mounted on the surface of the connecting pipe, the bottom end of the connecting pipe is provided with a connection installed on the bottom end of the separation shell, the bottom end of the separation shell is fixedly connected to the discharge pipe, the top side surface of the connecting pipe is fixedly connected to the exhaust pipe, and the end of the exhaust pipe is installed with an anti-backflow assembly.

[0013] Furthermore, the anti-backflow assembly includes an air outlet shell, a fixed ring, an anti-backflow plate, a guide column, an elastic spring and a limit plate. The end of the air outlet shell is connected to the exhaust pipe. The inner wall of the right end of the air outlet shell is fixedly connected to the fixed ring. The inner cavity of the fixed ring is penetrated by a guide column. The end of the guide column is fixedly connected to the anti-backflow plate, and the surface of the guide column is sleeved with an elastic spring.

[0014] Furthermore, the limit plate is fixedly connected to the end of the guide column, and the limit plate is sleeved on the elastic spring on the surface of the guide column and the elastic spring on the left surface of the fixing ring.

[0015] Furthermore, the collecting mechanism includes a collecting shell, a material receiving shell and an air outlet pipe. The collecting shell is fixedly mounted on the top side surface of the frame, the bottom end of the collecting shell is slidably connected to the material receiving shell, and the top right side of the collecting shell is fixedly connected to the air outlet pipe.

[0016] Furthermore, the filtering mechanism includes a hydraulic cylinder, a movable ring, a connecting column, a filter ring, a heating coil, a connecting frame, a sleeve, a filter screen and a cleaning assembly, the output end of the hydraulic cylinder is fixedly installed on the top side surface of the collecting shell, the output end of the hydraulic cylinder is fixedly connected to the movable ring, the bottom side of the movable ring is fixedly connected to the connecting column, the end of the connecting column is fixedly connected to the filter ring, the filter screen is installed in the filter ring, the side surface of the connecting column is installed with a connecting frame, the surface of the connecting frame is installed with a heating coil, and the middle of the connecting frame is installed with a sleeve.

[0017] Furthermore, the movable ring is slidably connected to the inner cavity of the collection shell, the movable ring is fixedly connected to the filter ring via a connecting column, and a heating ring is arranged on the top side of the filter screen.

[0018] Furthermore, the cleaning assembly includes a cleaning motor, a rotating shaft and a cleaning brush. The cleaning motor is fixedly mounted on the top side surface of the collection shell, the output end of the cleaning motor is connected to the rotating shaft, and the bottom side surface of the rotating shaft is fixedly connected to the cleaning brush.

[0019] Furthermore, there are two cleaning brushes, which are symmetrically distributed about the rotating shaft, the cleaning brush surfaces are in contact with the bottom side of the filter, and the bottom end of the rotating shaft passes through the inner cavity of the sleeve.

[0020] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0021] The positive and progressive effects of the present invention are:

[0022] The above-mentioned purification device for coalbed methane liquefaction uses a gas-water separation mechanism to separate moisture from the gas after the initial filtration to ensure the dryness of the gas, facilitate the unidirectional flow of the gas after gas-water separation, and avoid backflow. At the same time, the separated gas is filtered by the filtering mechanism, and the impurities in the gas are filtered again by the filtering mechanism. The impurities are collected by the collecting structure to facilitate subsequent processing, and automatic adjustment and cleaning are achieved during the filtration of the filtering mechanism to ensure the filtering effect of the filtering mechanism, improve the subsequent filtration efficiency of the coalbed methane, ensure the filtering effect, and improve the purification effect in the subsequent coalbed methane liquefaction process to meet the subsequent purification needs. The heating ring is heated to dry the moisture on the surface of the filter net, which is convenient for the cleaning brush to clean the impurities on the filter net, avoids the situation where adhering impurities are inconvenient to clean, and improves the subsequent cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application 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, the drawings described below are only some embodiments of the present application.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the purification device of the present invention.

[0025] Figure 2 It is a schematic diagram of the overall bottom three-dimensional structure of the purification device of the present invention when viewed from above.

[0026] Figure 3 It is a schematic diagram of the left three-dimensional structure of the purification device of the present invention.

[0027] Figure 4 It is a schematic diagram of the front side structure of the purification device of the present invention.

[0028] Figure 5 It is a schematic diagram of the overall top view of the purification device of the present invention.

[0029] Figure 6 It is a schematic diagram of the front cross-sectional structure of the purification device of the present invention.

[0030] Figure 7 The overall structure of the purification device of the present invention Figure 6 Schematic diagram of the partially enlarged surface structure at point A in the middle.

[0031] Figure 8 It is a schematic diagram of the three-dimensional connection surface structure of the moving ring surface of the purification device of the present invention.

[0032] Fig. 9 The purification device of the present invention Figure 8 Schematic diagram of the three-dimensional structure viewed from the bottom.

[0033] Description of Reference Numerals

[0034] 1. Frame; 2. Support; 3. Filter; 31. Injection pipe; 4. Air-water separation mechanism; 41. Separation shell; 42. Inlet pipe; 43. Separation plate; 44. Discharge pipe; 45. Connecting pipe; 46. Spiral blade; 47. Exhaust pipe; 48. Anti-backflow assembly; 481. Exhaust shell; 482. Fixed ring; 483. Anti-backflow plate; 484. Guide column; 485. Elastic spring; 486. Limit plate; 5. Collecting mechanism; 51. Collecting shell; 52. Receiving shell; 53. Exhaust pipe; 6. Filtering mechanism; 61. Hydraulic cylinder; 62. Moving ring; 63. Connecting column; 64. Filtering ring; 65. Heating coil; 66. Connecting frame; 67. Sleeve; 68. Filter; 69. Cleaning assembly; 691. Cleaning motor; 692. Rotating shaft; 693. Cleaning brush; 7. Controller; 8. Processor; 9. Battery. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0038] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0039] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0041] like Figure 1-9 As shown, the purification device for coalbed methane liquefaction includes:

[0042] A frame 1, a support 2 is fixedly connected to the bottom side of the frame 1, a filter 3 is fixedly installed on the top side of the frame 1, and an injection pipe 31 is installed on the bottom side surface of the filter 3;

[0043] A gas-water separation mechanism 4, which is mounted on the top surface of the frame 1 and is used to separate water from the coalbed methane filtered by the filter 3;

[0044] A collecting mechanism 5, which is used to collect impurities in the coalbed methane and is installed on the top side surface of the frame 1;

[0045] The filtering mechanism 6 is installed in the collecting mechanism 5 and is used for filtering impurities in the coalbed methane.

[0046] The injection pipe 31 sends the coalbed methane to be liquefied into the filter 3 for initial filtration, and the filtered gas enters the gas-water separation mechanism 4, and the gas-water separation mechanism 4 separates the moisture of the gas after the initial filtration to ensure the dryness of the gas, facilitate the one-way flow of the gas after gas-water separation, and avoid backflow. At the same time, the separated gas is filtered by the filtering mechanism 6, and the impurities in the gas are filtered again by the filtering mechanism 6. The impurities are collected by the collecting structure to facilitate subsequent processing, and the filtering mechanism 6 realizes automatic adjustment and cleaning during filtration to ensure the filtering effect of the filtering mechanism 6, improve the subsequent filtration efficiency of the coalbed methane, ensure the filtering effect, improve the purification effect in the subsequent coalbed methane liquefaction process, and meet the subsequent purification needs.

[0047] Four supports 2 are fixedly mounted on the bottom side of the frame 1 , and the four supports 2 are located at four corners of the bottom side of the frame 1 . A battery 9 , a controller 7 and a processor 8 are mounted on the surface of the frame 1 .

[0048] The gas-water separation mechanism 4 includes a separation shell 41, an air intake pipe 42, a separation plate 43, an exhaust pipe 47, a connecting pipe 45, a spiral blade 46, a discharge pipe 44 and an anti-backflow assembly 48. The separation shell 41 is fixedly mounted on the top side surface of the frame 1, and the left side of the top end of the separation shell 41 is connected to the filter 3 through the air intake pipe 42. A connecting pipe 45 is fixedly mounted on the top inner wall of the separation shell 41, and a spiral blade 46 is mounted on the surface of the connecting pipe 45. The bottom end of the connecting pipe 45 is provided with a spiral blade 46 installed on the bottom end of the separation shell 41. The bottom end of the separation shell 41 is fixedly connected to the discharge pipe 44, and the top side surface of the connecting pipe 45 is fixedly connected to the exhaust pipe 47. The end of the exhaust pipe 47 is installed with an anti-backflow assembly 48.

[0049] The filtered gas is separated by the spiral blades 46 in the separation shell 41, which is convenient for separating the gas and the liquid. The separated liquid is discharged through the discharge pipe 44, and the gas is discharged through the exhaust pipe 47. The gas is discharged in one direction through the anti-backflow component 48 to avoid gas backflow, thereby meeting the use requirements.

[0050] The anti-backflow assembly 48 includes an air outlet shell 481, a fixing ring 482, an anti-backflow plate 483, a guide column 484, an elastic spring 485 and a limit plate 486. The end of the air outlet shell 481 is connected to the exhaust pipe 47. The inner wall of the right end of the air outlet shell 481 is fixedly connected to the fixing ring 482. The inner cavity of the fixing ring 482 is penetrated by a guide column 484. The end of the guide column 484 is fixedly connected to the anti-backflow plate 483. The surface of the guide column 484 is sleeved with an elastic spring 485.

[0051] The limiting plate 486 is fixedly connected to the end of the guide column 484 , and the limiting plate 486 is connected to the elastic spring 485 on the left side surface of the fixing ring 482 through the elastic spring 485 sleeved on the surface of the guide column 484 .

[0052] After the gas is discharged into the gas outlet shell 481 through the exhaust pipe 47, the gas pushes the anti-backflow plate 483 to separate from the port of the gas outlet shell 481, and the elastic spring 485 is in a stretched state. When the gas is stopped, under the action of the elastic spring 485, the elastic spring 485 acts on the limit plate 486 to move, and the limit plate 486 drives the fixedly connected guide column 484 to push the anti-backflow plate 483 to fit the port of the gas outlet shell 481 to prevent the discharged gas from flowing back.

[0053] The collecting mechanism 5 includes a collecting shell 51, a material receiving shell 52 and an air outlet pipe 53. The collecting shell 51 is fixedly mounted on the top side surface of the frame 1. The bottom end of the collecting shell 51 is slidably connected to the material receiving shell 52. The top right side of the collecting shell 51 is fixedly connected to the air outlet pipe 53.

[0054] The filtering mechanism 6 includes a hydraulic cylinder 61, a movable ring 62, a connecting column 63, a filter ring 64, a heating coil 65, a connecting frame 66, a sleeve 67, a filter screen 68 and a cleaning assembly 69. The output end of the hydraulic cylinder 61 is fixedly installed on the top side surface of the collecting shell 51, the output end of the hydraulic cylinder 61 is fixedly connected to the movable ring 62, the bottom side of the movable ring 62 is fixedly connected to the connecting column 63, the end of the connecting column 63 is fixedly connected to the filter ring 64, the filter screen 68 is installed in the filter ring 64, the side surface of the connecting column 63 is installed with a connecting frame 66, the surface of the connecting frame 66 is installed with a heating coil 65, and the middle part of the connecting frame 66 is installed with a sleeve 67.

[0055] The hydraulic cylinder 61 pushes the fixedly connected moving ring 62 to move, and the moving ring 62 drives the connecting column 63 to adjust the position of the filter ring 64, so as to facilitate the position adjustment of the filter 68 and realize automatic adjustment, so as to avoid the bristles of the cleaning brush 693 being damaged and affecting the subsequent cleaning effect, and ensure that the bottom side of the filter 68 is in contact with the brush surface of the cleaning component 69, so as to facilitate the cleaning component 69 to clean the bottom side surface of the filter 68, ensure the filtering effect of the filter 68, save time, and improve the subsequent purification efficiency. The heating coil 65 heats the surface of the filter 68, and the heating coil 65 dries the moisture on the surface of the filter 68, so as to facilitate the cleaning brush 693 to clean the impurities of the filter 68, avoid the situation where the adhering impurities are inconvenient to clean, and improve the subsequent cleaning effect.

[0056] The movable ring 62 is slidably connected to the inner cavity of the collecting shell 51 . The movable ring 62 is fixedly connected to the filter ring 64 via a connecting column 63 . A heating ring 65 is provided on the top side of the filter screen 68 .

[0057] The cleaning assembly 69 includes a cleaning motor 691, a rotating shaft 692 and a cleaning brush 693. The cleaning motor 691 is fixedly mounted on the top side surface of the collecting shell 51. The output end of the cleaning motor 691 is connected to the rotating shaft 692. The bottom side surface of the rotating shaft 692 is fixedly connected to the cleaning brush 693.

[0058] There are two cleaning brushes 693 , which are symmetrically distributed about the rotating shaft 692 . The brush surface of the cleaning brush 693 is in contact with the bottom side of the filter screen 68 , and the bottom end of the rotating shaft 692 passes through the inner cavity of the sleeve 67 .

[0059] Start the cleaning motor 691, which drives the rotating shaft 692 to rotate. The rotating shaft 692 drives the cleaning brush 693 fixedly connected at the bottom end to rotate, and the bottom surface of the filter screen 68 is cleaned by the cleaning brush 693, thereby improving the cleaning effect of the surface of the filter screen 68 and facilitating the cleaning operation of the filter screen 68.

[0060] The circuits, electronic components and modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by this application does not involve improvements to software and methods.

[0061] The present invention is not limited to the above-mentioned embodiments. Any changes in shape or structure are within the protection scope of the present invention. The protection scope of the present invention is defined by the attached claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are within the protection scope of the present invention.

Claims

1. A purification device for coalbed methane liquefaction, characterized in that: The purification device for coalbed methane liquefaction comprises: A frame (1), wherein a support (2) is fixedly connected to the bottom side of the frame (1), a filter (3) is fixedly mounted on the top side of the frame (1), and an injection pipe (31) is mounted on the bottom end side surface of the filter (3); A gas-water separation mechanism (4), the gas-water separation mechanism (4) being mounted on the top surface of the frame (1), and the gas-water separation mechanism (4) being used to separate water from the coalbed methane filtered by the filter (3); A collecting mechanism (5), the collecting mechanism (5) is used to collect impurities in the coalbed methane, and the collecting mechanism (5) is installed on the top side surface of the frame (1); A filtering mechanism (6), wherein the filtering mechanism (6) is installed in the collecting mechanism (5), and the filtering mechanism (6) is used for filtering impurities in coalbed methane.

2. The purification device for coalbed methane liquefaction according to claim 1, characterized in that: Four supports (2) are fixedly mounted on the bottom side of the frame (1), and the four supports (2) are located at four corners of the bottom side of the frame (1). A battery (9), a controller (7) and a processor (8) are mounted on the surface of the frame (1).

3. The purification device for coalbed methane liquefaction according to claim 1, characterized in that: The gas-water separation mechanism (4) comprises a separation shell (41), an air intake pipe (42), a separation plate (43), a discharge pipe (44), a connecting pipe (45), a spiral blade (46), an exhaust pipe (47) and an anti-backflow assembly (48). The separation shell (41) is fixedly mounted on the top side surface of the frame (1). The left side of the top end of the separation shell (41) is connected to the filter (3) through the air intake pipe (42). A connecting pipe (45) is fixedly mounted on the inner wall of the top side of the separation shell (41). The surface of the connecting pipe (45) is installed with a spiral blade (46). The bottom end of the connecting pipe (45) is provided with a spiral blade installed on the bottom end of the separation shell (41). The bottom end of the separation shell (41) is fixedly connected with the discharge pipe (44). The top side surface of the connecting pipe (45) is fixedly connected with the exhaust pipe (47). The end of the exhaust pipe (47) is installed with an anti-backflow assembly (48).

4. The purification device for coalbed methane liquefaction according to claim 3, characterized in that: The anti-backflow assembly (48) comprises an air outlet shell (481), a fixing ring (482), an anti-backflow plate (483), a guide column (484), an elastic spring (485) and a limit plate (486); the end of the air outlet shell (481) is connected to the exhaust pipe (47); the inner wall of the right end of the air outlet shell (481) is fixedly connected to the fixing ring (482); the inner cavity of the fixing ring (482) is penetrated by a guide column (484); the end of the guide column (484) is fixedly connected to the anti-backflow plate (483); and the surface of the guide column (484) is sleeved with an elastic spring (485).

5. The purification device for coalbed methane liquefaction according to claim 4, characterized in that: The limit plate (486) is fixedly connected to the end of the guide column (484), and the limit plate (486) is connected to the elastic spring (485) on the surface of the guide column (484) and the elastic spring (485) on the left surface of the fixing ring (482) through an elastic spring (485) sleeved on the surface of the guide column (484).

6. The purification device for coalbed methane liquefaction according to claim 1, characterized in that: The collecting mechanism (5) comprises a collecting shell (51), a material receiving shell (52) and an air outlet pipe (53); the collecting shell (51) is fixedly mounted on the top side surface of the frame (1); the bottom end of the collecting shell (51) is slidably connected to the material receiving shell (52); and the top right side of the collecting shell (51) is fixedly connected to the air outlet pipe (53).

7. The purification device for coalbed methane liquefaction according to claim 1, characterized in that: The filtering mechanism (6) comprises a hydraulic cylinder (61), a movable ring (62), a connecting column (63), a filter ring (64), a heating coil (65), a connecting frame (66), a sleeve (67), a filter screen (68) and a cleaning assembly (69); the output end of the hydraulic cylinder (61) is fixedly mounted on the top surface of the collecting shell (51); the output end of the hydraulic cylinder (61) is fixedly connected to the movable ring (62); the bottom side of the movable ring (62) is fixedly connected to the connecting column (63); the end of the connecting column (63) is fixedly connected to the filter ring (64); the filter screen (68) is installed in the filter ring (64); the side surface of the connecting column (63) is mounted with a connecting frame (66); the surface of the connecting frame (66) is mounted with a heating coil (65); and the middle part of the connecting frame (66) is mounted with a sleeve (67).

8. The purification device for coalbed methane liquefaction according to claim 7, characterized in that: The movable ring (62) is slidably connected to the inner cavity of the collection shell (51); the movable ring (62) and the filter ring (64) are fixedly connected via a connecting column (63); and a heating ring (65) is provided on the top side of the filter screen (68).

9. The purification device for coalbed methane liquefaction according to claim 7, characterized in that: The cleaning assembly (69) comprises a cleaning motor (691), a rotating shaft (692) and a cleaning brush (693); the cleaning motor (691) is fixedly mounted on the top side surface of the collection shell (51); the output end of the cleaning motor (691) is connected to the rotating shaft (692); and the bottom side surface of the rotating shaft (692) is fixedly connected to the cleaning brush (693).

10. The purification device for coalbed methane liquefaction according to claim 9, characterized in that: There are two cleaning brushes (693), which are symmetrically distributed about the rotating shaft (692). The brush surface of the cleaning brush (693) is in contact with the bottom side of the filter screen (68), and the bottom end of the rotating shaft (692) passes through the inner cavity of the sleeve (67).

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