Multistage Gas Buffer Tank for Coalbed Methane Purification

Abstract

The present invention provides a multi-stage gas buffer tank for purified coalbed methane, which relates to the technical field of coalbed methane adsorption equipment, and to solve to a certain extent the problem that the existing multi-stage gas buffer tank for purified coalbed methane cannot quickly eliminate the pressure fluctuation of the fluid, resulting in unstable and uneven output of the gas. The multi-stage gas buffer tank for purified coalbed methane provided by the present invention includes a tank body, a first rectifying device, a displacement device and a second rectifying device; an air inlet and an air outlet are formed on the tank body, the first rectifying device is arranged corresponding to the air inlet, the second rectifying device is arranged corresponding to the air outlet, a plurality of air holes are distributed on the displacement device, the displacement device is arranged in the tank body and is located between the first rectifying device and the second rectifying device, and covers the tank body along the radial direction of the tank body to divide the inside of the tank body into a first gas chamber and a second gas chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of coalbed methane adsorption equipment, and in particular to a multi-stage gas buffer tank for coalbed methane purification. Background Art

[0002] At present, most of the buffer tanks used in the fields of petrochemical industry and the like have a cavity structure inside, and there are no other devices inside the cavity. When the fluid pressure is too high, the pressure fluctuation of the fluid cannot be quickly eliminated, so that the fluid in the pipeline cannot always run in a stable state. Moreover, when the buffer tank stores the fluid, the flow state of the fluid cannot be changed either.

[0003] Therefore, there is an urgent need to provide a multi-stage gas buffer tank for coalbed methane purification to solve the problems existing in the prior art to a certain extent. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-stage gas buffer tank for coalbed methane purification, which can change the turbulent flow state of the gas flow before entering the buffer tank into a laminar flow state with stable pressure and uniform flow velocity after passing through the buffer tank, so as to solve the problem that the existing multi-stage gas buffer tank for coalbed methane purification cannot quickly eliminate the existing pressure fluctuation, resulting in unstable and non-uniform output of the gas to a certain extent.

[0005] A multi-stage gas buffer tank for coalbed methane purification provided by the present invention includes a tank body, a first rectifying device, a displacement device and a second rectifying device; an air inlet and an air outlet are formed on the tank body, the first rectifying device is arranged corresponding to the air inlet, the second rectifying device is arranged corresponding to the air outlet, a plurality of through holes are distributed on the displacement device, the displacement device is arranged inside the tank body, and is located between the first rectifying device and the second rectifying device, and covers the tank body along the radial direction of the tank body, so as to divide the inside of the tank body into a first gas chamber and a second gas chamber.

[0006] Wherein, the first rectifying device includes a first outer tube and a plurality of first bundle tubes; the first outer tube is connected to the tank body, and the plurality of first bundle tubes are arranged inside the first outer tube, and the plurality of first bundle tubes are closely arranged inside the first outer tube.

[0007] Specifically, the first outer tube is inside the tank body, and an inclined cut surface is formed at one end far away from the tank body, and the included angle formed between the inclined cut surface and the horizontal plane is between 40° and 50°, and one end of the plurality of first bundle tubes corresponding to the inclined cut surface is arranged in cooperation with the inclined cut surface.

[0008] Further, a first docking part is provided at one end of the first outer tube far away from the inclined cut surface.

[0009] Among them, the second rectifying device includes a second outer tube and a plurality of second bundle tubes; the second outer tube is connected to the tank body, and the plurality of second bundle tubes are arranged in the second outer tube and are closely arranged in the second outer tube.

[0010] Specifically, one end of the second outer tube located inside the tank body is formed with a gas collecting port, and the gas collecting port is in a funnel shape.

[0011] Furthermore, the multi-stage gas buffer tank for coalbed methane purification provided by the present invention further includes a wind cap. The wind cap is arranged between the ends of the plurality of second bundle tubes and the gas collecting port and is located at the central position of the plurality of second bundle tubes. An air guiding surface is formed at the end of the wind cap, and the air guiding surface is in an arc shape.

[0012] Furthermore, one end of the second outer tube located outside the tank body is provided with a second docking member.

[0013] Among them, the replacement device includes a baffle and a plurality of gas collecting pipe assemblies; through holes are formed in the baffle, and the through holes are arranged in one-to-one correspondence with the gas collecting pipe assemblies. The gas collecting pipe assemblies are arranged in the through holes and can slide relative to the baffle; each gas collecting pipe assembly includes a gas collecting pipe and a retaining ring. The two ends of the gas collecting pipe are respectively formed with abutting portions. The retaining ring is sleeved on the gas collecting pipe and abuts against the abutting portion of the gas collecting pipe located in the first air chamber. The air passing hole is formed at one end of the gas collecting pipe located in the second air chamber.

[0014] Specifically, a drain pipe and a support are provided at the bottom of the tank body. The drain pipe is used to drain the liquid in the tank body, and the support is used to support the tank body off the ground.

[0015] Compared with the prior art, the multi-stage gas buffer tank for coalbed methane purification provided by the present invention has the following advantages:

[0016] The multi-stage gas buffer tank for coalbed methane purification provided by the present invention includes a tank body, a first rectifying device, a replacement device and a second rectifying device; an air inlet and an air outlet are formed on the tank body. The first rectifying device is arranged corresponding to the air inlet, the second rectifying device is arranged corresponding to the air outlet, a plurality of air passing holes are distributed on the replacement device, the replacement device is arranged in the tank body and is located between the first rectifying device and the second rectifying device and covers the tank body along the radial direction of the tank body to divide the inside of the tank body into a first air chamber and a second air chamber.

[0017] It can be analyzed from this that through the air inlet and air outlet holes formed by the tank body, and a first rectifying device is correspondingly arranged at the position of the air inlet, and a second rectifying device is arranged at the position of the air outlet. Thus, the gas input into the tank body can be rectified once by the first rectifying device. Correspondingly, the gas about to be output from the tank body can be finally rectified by the second rectifying device. Therefore, through the first rectifying device and the second rectifying device, the pressure fluctuation of the gas can be eliminated to a certain extent, so that the gas can be stably output from the tank body.

[0018] Moreover, since a displacement device is also provided in the tank body in this application, and the displacement device covers the tank body along the radial direction of the tank body, the tank body can be divided into a first gas chamber and a second gas chamber. When the gas enters the tank body from the first rectifying device, it can fill the first gas chamber, enabling the gas to be preliminarily buffered. And, since through holes are formed on the displacement device in this application, the buffered gas in the first gas chamber can enter the second gas chamber through the through holes. Thus, through the multiple through holes distributed on the displacement device, the gas can enter the second gas chamber uniformly and stably from the first gas chamber, further eliminating the pressure fluctuation after the gas enters the tank body, and then ensuring that the gas can be stably output from the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the multi-stage gas buffer tank for coalbed methane purification provided by the embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the first rectifying device in the multi-stage gas buffer tank for coalbed methane purification provided by the embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the second rectifying device in the multi-stage gas buffer tank for coalbed methane purification provided by the embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the displacement device in the multi-stage gas buffer tank for coalbed methane purification provided by the embodiment of the present invention.

[0024] In the figure: 1 - tank body; 101 - first air chamber; 102 - second air chamber; 103 - drain pipe; 104 - support; 2 - first rectifying device; 201 - first outer pipe; 2011 - inclined cut surface; 2012 - first docking member; 202 - first bundle of pipes; 3 - second rectifying device; 301 - second outer pipe; 3011 - air collecting port; 3012 - second docking member; 302 - second bundle of pipes; 303 - wind cap; 3031 - air guiding surface; 4 - replacement device; 401 - baffle; 4011 - perforation; 402 - gas collecting pipe; 4021 - abutting portion; 4022 - retaining ring; 4023 - air passing hole. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0026] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0027] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0028] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0030] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship between one element and another as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0031] The terms used herein are for the purpose of describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0032] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0033] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0034] As Figures 1-4As shown in the figure, the present invention provides a multi-stage gas buffer tank for coalbed methane purification, which includes a tank body 1, a first rectifying device 2, a displacement device 4 and a second rectifying device 3; an air inlet and an air outlet are formed on the tank body 1, the first rectifying device 2 is arranged corresponding to the air inlet, the second rectifying device 3 is arranged corresponding to the air outlet, a plurality of air holes 4023 are distributed on the displacement device 4, the displacement device 4 is arranged in the tank body 1 and is located between the first rectifying device 2 and the second rectifying device 3, and covers the tank body 1 along the radial direction of the tank body 1 to divide the inside of the tank body 1 into a first gas chamber 101 and a second gas chamber 102.

[0035] Compared with the prior art, the multi-stage gas buffer tank for coalbed methane purification provided by the present invention has the following advantages:

[0036] For the multi-stage gas buffer tank for coalbed methane purification provided by the present invention, through the air inlet and air outlet formed by the tank body 1, and the first rectifying device 2 is correspondingly arranged at the air inlet position, and the second rectifying device 3 is arranged at the air outlet position, so that the gas input into the tank body 1 can be rectified once by the first rectifying device 2. Correspondingly, the gas about to be output from the tank body 1 can be finally rectified by the second rectifying device 3. Thus, the pressure fluctuation of the gas can be eliminated to a certain extent by the first rectifying device 2 and the second rectifying device 3, so that the gas can be stably output from the tank body 1.

[0037] Moreover, since a displacement device 4 is also provided in the tank body 1 in the present application, and the displacement device 4 covers the tank body 1 along the radial direction of the tank body 1, therefore, the inside of the tank body 1 can be divided into a first gas chamber 101 and a second gas chamber 102. When the gas enters the tank body 1 from the first rectifying device 2, it can fill the first gas chamber 101. And because the displacement device 4 in the present application is formed with air holes 4023, therefore, the gas in the first gas chamber 101 can enter the second gas chamber 102 through the air holes 4023. Thus, through the plurality of air holes 4023 distributed on the displacement device 4, the gas can stably enter the second gas chamber 102 from the first gas chamber 101, further eliminating the pressure fluctuation after the gas enters the tank body 1, and then ensuring that the gas can be stably output from the tank body 1.

[0038] Optionally, as Figure 1 Combined Figure 2 shown in the figure, the first rectifying device 2 in the present application includes a first outer tube 201 and a plurality of first bundle tubes 202; the first outer tube 201 is connected to the tank body 1, and the plurality of first bundle tubes 202 are arranged in the first outer tube 201 and are closely arranged in the first outer tube 201.

[0039] By closely arranging a plurality of first tube bundles 202 within the first outer tube 201, the first outer tube 201 can be partitioned into a plurality of air passages. Thus, when gas enters the tank body 1 from the first rectifying device 2, it can be distributed into the plurality of first tube bundles 202 for flow. Furthermore, the gas originally in a turbulent state can be preliminarily rectified to form a state close to laminar flow, and the gas flow rate can be reduced, and the air flow pressure can be stabilized.

[0040] Preferably, as Figure 2 shown, the first outer tube 201 in the present application is within the tank body 1, and an inclined cut surface 2011 is formed at one end away from the tank body 1. The included angle formed between the inclined cut surface 2011 and the horizontal plane is between 40° and 50°. One end of the plurality of first tube bundles 202 corresponding to the inclined cut surface 2011 is arranged in cooperation with the inclined cut surface 2011.

[0041] In the present application, by forming the inclined cut surface 2011 at one end of the first outer tube 201 away from the tank body 1, the flow-through area of the first outer tube 201 can be increased, thereby improving the air intake volume.

[0042] It can be understood that the first outer tube 201 in the present application has a cylindrical structure. By forming the inclined cut surface 2011 at one end, the end surface of the first outer tube 201 can be made elliptical, thereby increasing the flow-through area. Further preferably, the included angle between the inclined cut surface 2011 and the horizontal plane in the present application is 45°, so that the area of the formed elliptical air outlet surface can be maximized, and further the air intake volume can be maximized, ensuring the air intake and rectifying effects.

[0043] It should be supplemented here that when the first rectifying device 2 provided in the present application is processed, the end of the first outer tube 201 is cut obliquely first to form an inclined cut surface 2011 with an included angle of 45° with the horizontal plane. Then, a plurality of first tube bundles 202 are inserted into the first outer tube 201. The statement that one end of the above-mentioned first tube bundles 202 corresponding to the inclined cut surface 2011 is arranged in cooperation with the inclined cut surface 2011 means that the lengths of the plurality of first tube bundles 202 in the first outer tube 201 are different. By arranging the first tube bundles 202 with different lengths in the first outer tube 201 according to the angle of the inclined cut surface 2011, the end surfaces formed by the plurality of first tube bundles 202 can be made to coincide with the inclined cut surface 2011, thereby ensuring the maximization of the flow-through area and improving the air intake volume.

[0044] Optionally, as Figure 2 shown, a first docking member 2012 is provided at one end of the first outer tube 201 away from the inclined cut surface 2011, and the first docking member 2012 is a flange plate, which can be docked with the gas supply pipeline to realize the supply of gas into the tank body 1.

[0045] Optionally, as Figure 3As shown, the second rectifying device 3 in the present application includes a second outer tube 301 and a plurality of second bundle tubes 302; the second outer tube 301 is connected to the tank body 1, and the plurality of second bundle tubes 302 are arranged in the second outer tube 301 and are closely arranged in the second outer tube 301.

[0046] By closely arranging a plurality of second bundle tubes 302 in the second outer tube 301, the second outer tube 301 can be divided into a plurality of air channels, so that when the gas enters the second outer tube 301 from the second air chamber 102, it can be distributed to flow in the plurality of first bundle tubes 202, and then the gas entering the second air chamber 102 can be further rectified and output, making the output air flow in a laminar state and improving the stability of the output air flow pressure.

[0047] Preferably, as Figure 3 shown, one end of the second outer tube 301 in the tank body 1 forms a gas collecting port 3011, and the gas collecting port 3011 is funnel-shaped. It can be understood that the funnel-shaped gas collecting port 3011 can have a good gas gathering effect, enabling the gas to enter the second outer tube 301 and flow towards the second bundle tubes 302.

[0048] Optionally, as Figure 3 shown, the coalbed methane purification multi-stage gas buffer tank provided by the present invention further includes a wind cap 303. The wind cap 303 is arranged between the ends of the plurality of second bundle tubes 302 and the gas collecting port 3011 and is located at the central position of the plurality of second bundle tubes 302. The end of the wind cap 303 forms a wind guiding surface 3031, and the wind guiding surface 3031 is arc-shaped.

[0049] Since the gas entering the second air chamber 102 through the displacement device 4 is closer to the laminar state, and the flow velocity in the central region of the laminar air flow is fast and the flow velocity around is slow. Therefore, in the present application, by installing a wind cap 303 at the central position between the plurality of second bundle tubes 302, the air flow with a fast central flow velocity can be slowed down and guided. When the gas contacts the wind guiding surface 3031 of the wind cap 303, since the wind guiding surface 3031 is arc-shaped, the air flow can be guided to the surroundings, so that the flow velocity of the gas in the central region can be slowed down and the flow velocity around can be increased, achieving an equilibrium state of the air flow, making the flow velocities of the gas entering the plurality of second bundle tubes 302 basically the same, and then enabling the gas output through the second bundle tubes 302 to reach the laminar state and ensuring the stability of the gas pressure.

[0050] Optionally, as Figure 3 shown, one end of the second outer tube 301 outside the tank body 1 is provided with a second docking member 3012, and the second docking member 3012 also uses a flange, so as to be able to dock with the outlet pipeline to realize the output of the gas.

[0051] Optionally, as Figure 4As shown, the replacement device 4 in the present application includes a baffle 401 and a plurality of gas collecting pipe 402 assemblies; a perforation 4011 is formed on the baffle 401, and the perforation 4011 is arranged in one-to-one correspondence with the gas collecting pipe 402 assemblies. The gas collecting pipe 402 assemblies are arranged in the perforation 4011 and can slide relative to the baffle 401; the gas collecting pipe 402 assemblies include a gas collecting pipe 402 and a retaining ring 4022. Abutted portions 4021 are respectively formed at both ends of the gas collecting pipe 402. The retaining ring 4022 is sleeved on the gas collecting pipe 402 and abuts against the abutted portion 4021 of the gas collecting pipe 402 located in the first air chamber 101. An air passing hole 4023 is formed at one end of the gas collecting pipe 402 located in the second air chamber 102.

[0052] It can be understood that the aperture of the perforation 4011 in the present application is slightly larger than the diameter of the gas collecting pipe 402, so that the gas collecting pipe 402 can slide relative to the baffle 401. The gas collecting pipe 402 can slide relative to the baffle 401 because when the gas enters the first air chamber 101 from the first rectifying device 2, the pressure in the first air chamber 101 can be continuously increased, so that the gas collecting pipe 402 can be pushed to slide relative to the baffle 401 gradually in the direction of entering the second air chamber 102.

[0053] Since abutted portions 4021 are formed at both ends of the gas collecting pipe 402 in the present application, and the air passing hole 4023 is formed at one end of the gas collecting pipe 402 located in the second air chamber 102, therefore, when the gas is continuously input into the first air chamber 101, the air pressure in the first air chamber 101 can push the gas collecting pipe 402 to slide relative to the baffle 401 in the direction of the second air chamber 102. When the abutted portion 4021 located in the first air chamber 101 abuts against the baffle 401, the gas collecting pipe 402 stops sliding. Since the retaining ring 4022 abuts against the abutted portion 4021 of the gas collecting pipe 402 located in the first air chamber 101, therefore, to a certain extent, the retaining ring 4022 can seal between the abutted portion 4021 and the baffle 401, so that the gas can only be discharged into the second air chamber 102 through the air passing hole 4023 of the gas collecting pipe 402.

[0054] When no gas enters the first air chamber 101 or the gas intake decreases, the gas collecting pipe 402 moves downward relative to the baffle 401 under the influence of gravity, so that the abutted portion 4021 located in the second air chamber 102 can abut against the baffle 401 to realize the limit of the gas collecting pipe 402. And, as Figure 4 shown, since the air passing hole 4023 in the present application is located on the side wall of the gas collecting pipe 402, therefore, when the abutted portion 4021 in the second air chamber 102 abuts against the baffle 401, the baffle 401 can block the air passing hole 4023, so that the gas collecting pipe 402 no longer conducts gas, and further the pressure in the first air chamber 101 can be continuously increased until the gas collecting pipe 402 can be pushed to move upward, so that the gas enters the second air chamber 102 again to realize the automatic regulation of the pressure.

[0055] Preferably, as Figure 1 shown, a drain pipe 103 and a support 104 are provided at the bottom of the tank body 1 in the present application. The drain pipe 103 is used to discharge the liquid in the tank body 1, and the support 104 is used to support the tank body 1 off the ground.

[0056] The drain pipe 103 is connected to the bottom of the tank body 1 and can discharge the liquid in the tank body 1. By providing the support 104 at the bottom of the tank body 1, the tank body 1 can be supported and the tank body 1 can be set away from the ground.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-stage gas buffer tank for coalbed methane purification, characterized in that, It includes a tank body, a first rectifying device, a displacement device and a second rectifying device; An air inlet and an air outlet are formed on the tank body. The first rectifying device is arranged corresponding to the air inlet, the second rectifying device is arranged corresponding to the air outlet. A plurality of air passing holes are distributed on the displacement device. The displacement device is arranged in the tank body and is located between the first rectifying device and the second rectifying device, and covers the tank body along the radial direction of the tank body to divide the inside of the tank body into a first air chamber and a second air chamber; The first rectifying device includes a first outer tube and a plurality of first bundle tubes; The first outer tube is connected to the tank body. A plurality of the first bundle tubes are arranged in the first outer tube, and the plurality of first bundle tubes are closely arranged in the first outer tube; The first outer tube is in the tank body, and an inclined section is formed at one end away from the tank body, and the included angle formed between the inclined section and the horizontal plane is between 40° and 50°. One ends of the plurality of first bundle tubes are arranged in cooperation with the inclined section; The second rectifying device includes a second outer tube and a plurality of second bundle tubes; The second outer tube is connected to the tank body. A plurality of the second bundle tubes are arranged in the second outer tube, and the plurality of second bundle tubes are closely arranged in the second outer tube; A gas collecting port is formed at one end of the second outer tube in the tank body, and the gas collecting port is in a funnel shape; It further includes a wind cap. The wind cap is arranged between the ends of the plurality of second bundle tubes and the gas collecting port and is located at the central position of the plurality of second bundle tubes. A wind guiding surface is formed at the end of the wind cap, and the wind guiding surface is in an arc shape.

2. The multi-stage gas buffer tank for purified coalbed methane according to claim 1, characterized in that, A first docking member is provided at one end of the first outer tube away from the inclined section.

3. The multi-stage gas buffer tank for purified coalbed methane according to claim 1, wherein A second docking member is provided at one end of the second outer tube outside the tank body.

4. The multi-stage gas buffer tank for coalbed methane purification according to claim 1, characterized in that, The displacement device includes a baffle and a plurality of gas collecting pipe assemblies; Perforations are formed on the baffle, and the perforations are arranged in one-to-one correspondence with the gas collecting pipe assemblies. The gas collecting pipe assemblies are arranged in the perforations and can slide relative to the baffle; The gas collecting pipe assembly includes a gas collecting pipe and a retaining ring. Abutted portions are respectively formed at both ends of the gas collecting pipe. The retaining ring is sleeved on the gas collecting pipe and abuts against the abutted portion of the gas collecting pipe in the first air chamber. The air passing holes are formed at one end of the gas collecting pipe in the second air chamber.

5. The multi-stage gas buffer tank for coalbed methane purification according to claim 1, characterized in that, A drain pipe and a support are provided at the bottom of the tank body. The drain pipe is used to discharge the liquid in the tank body, and the support is used to support the tank body off the ground.

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