A gas pipeline coating film tail gas recovery device

Abstract

This utility model provides a gas pipeline coating tail gas recovery device, relating to the field of pipeline coating technology. The device includes a connecting pipe, a storage tank, and an exhaust pipe. The storage tank contains a cavity for holding corrosion inhibitors and natural gas. The inlet end of the connecting pipe is connected to the pipeline being coated, and the outlet end is connected to the cavity. The inlet end of the exhaust pipe is connected to the cavity, and the outlet end is connected to a flare tower. The outlet end of the connecting pipe is positioned lower than the inlet end of the exhaust pipe. This gas pipeline coating tail gas recovery device not only effectively prevents atmospheric pollution but also effectively reduces safety risks.

Description

Technical Field

[0001] This utility model relates to the field of pipeline coating technology, specifically to a gas pipeline coating tail gas recovery device. Background Technology

[0002] Currently, during the batch processing of gas pipeline coating operations, when corrosion inhibitors are added to the pipeline, the residual natural gas in the pipeline is generally discharged directly on-site. However, since batch processing of gas pipeline coating operations is generally carried out in high-risk locations such as natural gas gathering and transmission stations, it is easy to cause accidents such as fires and explosions, posing significant safety risks. At the same time, on-site discharge will also cause a certain degree of pollution to the atmospheric environment. Utility Model Content

[0003] To address the problems in related technologies, this utility model provides a gas pipeline coating tail gas recovery device. This gas pipeline coating tail gas recovery device not only effectively avoids atmospheric pollution but also effectively reduces safety risks.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A gas pipeline coating tail gas recovery device includes a connecting pipe, a storage tank, and an exhaust pipe; the storage tank has a cavity for containing corrosion inhibitor and natural gas; the inlet end of the connecting pipe is connected to the pipeline to be coated, the outlet end of the connecting pipe is connected to the cavity, the inlet end of the exhaust pipe is connected to the cavity, and the outlet end of the exhaust pipe is connected to a flare tower.

[0006] The outlet end of the connecting pipe is positioned lower than the inlet end of the exhaust pipe.

[0007] Optionally, the outlet end of the connecting pipe is installed on the side wall of the liquid storage tank, and the inlet end of the exhaust pipe is installed on the top wall of the liquid storage tank.

[0008] Optionally, the connecting pipe includes a first pipe body, a quick-connect fitting, a second pipe body, and a connecting flange; one end of the first pipe body is installed on the side wall of the liquid storage tank, the quick-connect fitting is installed on the end of the first pipe body away from the liquid storage tank, one end of the second pipe body is detachably installed on the quick-connect fitting, and the connecting flange is installed on the end of the second pipe body away from the quick-connect fitting, and the connecting flange is used to connect with the coated pipe.

[0009] Optionally, the second tube is configured as a flexible tube.

[0010] Optionally, the exhaust pipe includes a third pipe body, a fourth pipe body, a one-way valve, a first control valve, and a pressure gauge; one end of the third pipe body is installed on the top wall of the liquid storage tank, one end of the fourth pipe body is connected to the end of the third pipe body away from the liquid storage tank, and the other end of the fourth pipe body is used to connect to the flare tower; the one-way valve is disposed on the third pipe body; the first control valve and the pressure gauge are disposed on the fourth pipe body, and the first control valve is located downstream of the pressure gauge; the first control valve is used to control the opening and closing of the fourth pipe body; and the pressure gauge is used to measure the pressure inside the fourth pipe body.

[0011] Optionally, the third tube is configured as a flexible tube.

[0012] Optionally, the gas pipeline coating tail gas recovery device further includes a recovery pipe, the inlet end of which is connected to the receiving cavity, and the outlet end of which is connected to the corrosion inhibitor recovery device. The inlet end of the recovery pipe is positioned lower than the outlet end of the connecting pipe.

[0013] Optionally, the recovery pipe includes a fifth pipe body and a second control valve. The outlet end of the connecting pipe is installed on the top of the side wall of the storage tank, one end of the fifth pipe body is installed on the bottom of the side wall of the storage tank, and the second control valve is installed on the fifth pipe body to control the opening and closing of the fifth pipe body.

[0014] Optionally, the gas pipeline coating tail gas recovery device further includes a mounting frame, which is disposed at the bottom of the liquid storage tank to support the liquid storage tank.

[0015] Optionally, the mounting frame includes a frame body and casters disposed at the bottom of the frame body, the frame body being used to support the liquid storage tank.

[0016] Beneficial effects:

[0017] 1. The effects achieved by this utility model through the above technical solution include: First, it effectively eliminates the risk of direct emissions from high-risk locations. Specifically, existing related technologies directly discharge flammable and explosive natural gas into the high-risk natural gas gathering and transmission station operating environment, which can easily cause fires or explosions due to static electricity, sparks, or other ignition sources. This utility model, by guiding residual natural gas to the containment cavity of the storage tank and then safely transporting it through the exhaust pipe to a specially designed flare tower (for safe combustion treatment of waste gas), effectively avoids the risk of direct diffusion of natural gas at the work site, fundamentally eliminating the hidden dangers of causing major safety accidents such as fires and explosions. At the same time, it can significantly reduce the negative impact on the atmospheric environment.

[0018] Secondly, it enables the safe transfer and treatment of residual natural gas. Specifically, this invention constructs a safe transport channel from the coated pipeline → connecting pipe → storage tank cavity → exhaust pipe → flare tower. This ensures that the residual natural gas is ultimately led to the flare tower for combustion, effectively destroying it and preventing it from directly entering the atmosphere.

[0019] Third, it enables gas-liquid separation and buffering. Specifically, firstly, the storage tank's containment chamber receives the mixture (residual natural gas and corrosion inhibitor liquid) from the coated pipeline. By setting the outlet end of the connector lower than the inlet end of the exhaust pipe, the corrosion inhibitor can naturally settle at the bottom of the storage tank's containment chamber, while the natural gas naturally rises and accumulates in the top space of the containment chamber, thus achieving natural gravity separation of natural gas and corrosion inhibitor. Secondly, the storage tank provides a buffer space that can temporarily hold a certain amount of gas, smoothing out possible airflow fluctuations and avoiding instantaneous impact on the downstream flare system.

[0020] Fourth, this utility model has a simple structure and does not rely on complex control systems or separation equipment. It has the advantages of simple structure, high operational reliability, and easy deployment and maintenance in high-risk sites.

[0021] 2. Other beneficial effects or advantages of this utility model will be described in detail in conjunction with the specific structure in the specific embodiments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, it should be understood that the proportional relationship of each component in the drawings of this specification does not represent the proportional relationship in the actual material selection and design, but is only a schematic diagram of the structure or position, wherein:

[0023] Figure 1 This is a three-dimensional structural schematic diagram of a gas pipeline coating tail gas recovery device provided in an exemplary embodiment of this utility model;

[0024] Figure 2 This is a three-dimensional structural diagram of the connecting pipe provided in an exemplary embodiment of the present utility model;

[0025] Figure 3 This is a three-dimensional structural diagram of an exhaust pipe provided in an exemplary embodiment of this utility model.

[0026] Explanation of the labels in the attached drawings:

[0027] 100-Gas pipeline coating tail gas recovery device; 1-Connecting pipe; 11-First pipe body; 12-Quick-connector; 13-Second pipe body; 14-Connecting flange; 2-Storage tank; 3-Exhaust pipe; 31-Third pipe body; 32-Fourth pipe body; 33-Check valve; 34-First control valve; 35-Pressure gauge; 4-Recovery pipe; 41-Fifth pipe body; 42-Second control valve; 5-Mounting bracket; 51-Frame body; 52-Moving wheels. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] In the description of this utility model, it should be noted that the terms used, such as "top surface" and "bottom surface," refer to the side of the gas pipeline coating tail gas recovery device of this utility model facing upwards when in use as the top surface and the side facing downwards as the bottom surface; the terms used, such as "first" and "second," are only for distinguishing descriptions and do not indicate or imply a difference in importance or order; the terms used, such as "inner" and "outer," refer to the inner and outer parts of a specific outline. The use of the above terms is only for the purpose of clearly and simply describing the technical solution of this utility model and should not be construed as a limitation of this utility model.

[0031] To facilitate understanding by relevant technical personnel, the process of adding corrosion inhibitors in existing related technologies will be briefly described below.

[0032] Currently, in batch gas pipeline coating operations, the core objective of adding corrosion inhibitors is to form a uniform protective film on the inner wall of the pipeline to resist the erosion of corrosive media such as hydrogen sulfide and carbon dioxide. This process mainly includes:

[0033] First, use a pipeline cleaning tool to remove iron filings, dirt, and other contaminants from the pipeline. After cleaning, inject a certain amount of corrosion inhibitor into the pipeline using a high-pressure pump to form a "corrosion inhibitor liquid column." The amount of corrosion inhibitor injected is calculated based on the pipeline's inner diameter, length, and target film thickness.

[0034] During this process, since some natural gas usually remains in the pipeline, when the corrosion inhibitor is added, the remaining natural gas is "pushed" out of the pipeline by the corrosion inhibitor and discharged on-site.

[0035] This will lead to some pollution of the surrounding atmosphere. At the same time, since processing sites are generally high-risk locations such as natural gas gathering and transmission stations, they are prone to accidents such as fires and explosions.

[0036] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0037] like Figures 1 to 3 As shown, this embodiment provides a gas pipeline coating tail gas recovery device 100, including a connecting pipe 1, a storage tank 2, and an exhaust pipe 3; the storage tank 2 has a cavity for containing corrosion inhibitor and natural gas, the inlet end of the connecting pipe 1 is connected to the pipeline to be coated, the outlet end of the connecting pipe 1 is connected to the cavity, the inlet end of the exhaust pipe 3 is connected to the cavity, and the outlet end of the exhaust pipe 3 is connected to the flare tower; wherein, the outlet end of the connecting pipe 1 is positioned lower than the inlet end of the exhaust pipe 3.

[0038] Through the above technical solution, the effects achieved by this utility model include: First, it effectively eliminates the risk of direct emissions from high-risk locations. Specifically, existing related technologies directly discharge flammable and explosive natural gas into the high-risk natural gas gathering and transmission station operating environment, which can easily cause fires or explosions due to static electricity, sparks, or other ignition sources. This utility model, by guiding residual natural gas to the containment cavity of the storage tank 2 and then safely transporting it through the exhaust pipe 3 to a specially designed flare tower (for safe combustion treatment of waste gas), effectively avoids the risk of direct diffusion of natural gas at the work site, fundamentally eliminating the hidden dangers of causing major safety accidents such as fires and explosions. Simultaneously, it significantly reduces the negative impact on the atmospheric environment.

[0039] Secondly, it enables the safe transfer and treatment of residual natural gas. Specifically, this invention constructs a safe transport channel from the coated pipeline → connecting pipe 1 → storage tank 2 → exhaust pipe 3 → flare tower. This ensures that the residual natural gas is ultimately led to the flare tower for combustion, effectively destroying it and preventing it from directly entering the atmosphere.

[0040] Third, it enables gas-liquid separation and buffering. Specifically, firstly, the receiving cavity of the storage tank 2 receives the mixture (residual natural gas and corrosion inhibitor liquid) from the coated pipeline. By setting the outlet end of the connecting pipe 1 to be lower than the inlet end of the exhaust pipe 3, the corrosion inhibitor can naturally settle at the bottom of the receiving cavity of the storage tank 2. At the same time, the natural gas naturally rises and accumulates in the top space of the receiving cavity, thus achieving natural gravity separation of natural gas and corrosion inhibitor. Secondly, the storage tank 2 provides a buffer space that can temporarily hold a certain amount of gas, smoothing possible airflow fluctuations and avoiding instantaneous impact on the downstream flare system.

[0041] Fourth, this utility model has a simple structure and does not rely on complex control systems or separation equipment. It has the advantages of simple structure, high operational reliability, and easy deployment and maintenance in high-risk sites.

[0042] During this process, it should be noted that as the corrosion inhibitor continues to enter the containment cavity, a certain liquid layer will form above the outlet of the connecting pipe 1 because the inlet of the exhaust pipe 3 is located at a higher position in the containment cavity, while the outlet of the connecting pipe 1 is located at a lower position. This liquid layer can form a physical isolation barrier without any additional valves or seals, which can not only effectively prevent gas backflow (preventing the natural gas accumulated at the top of the storage tank 2 from flowing back to the working pipeline or site through the connecting pipe 1), but also isolate the working environment (physically isolating the natural gas from the open working environment, improving the safety of the operation process).

[0043] In one embodiment of this utility model, such as Figure 1 As shown, the outlet end of the connecting pipe 1 of this utility model can be installed on the side wall of the liquid storage tank 2, and the inlet end of the exhaust pipe 3 can be installed on the top wall of the liquid storage tank 2.

[0044] Thus, firstly, by positioning the outlet end of the connecting pipe 1 on the side wall of the storage tank 2 (usually in the upper or middle part), the gas-liquid mixture entering the containment chamber is injected horizontally or at a slight angle above or at the surface of the liquid inside the tank. This injection method not only reduces disturbance to the settled liquid (compared to bottom injection, side wall injection gently introduces the mixture into the gas space or liquid surface area of ​​the tank, minimizing agitation of the separated corrosion inhibitor at the bottom and helping to maintain a clear separation interface), but also promotes natural stratification (after the mixture enters, the corrosion inhibitor naturally settles downwards due to gravity and density difference, while natural gas naturally escapes upwards. The side wall inlet position allows sufficient upward space for the gas and sufficient settling path for the liquid).

[0045] Secondly, as the lightest component, natural gas will inevitably accumulate at the very top of the containment chamber. The top wall inlet is located directly at this highest point, ensuring that the gas discharged through exhaust pipe 3 is virtually free of liquid entrainment. Simultaneously, the placement of the top wall inlet, combined with the side wall inlet (located lower than the top wall), effectively increases the vertical distance between the liquid surface at the side wall inlet and the top wall inlet (the greater this distance, the higher the liquid seal column, and the stronger and more reliable its ability to isolate gas and prevent backflow). Finally, if the exhaust pipe 3 inlet is positioned too low (e.g., high on the side wall), there is a risk of insufficient gas separation or a direct "short-circuit" of the gas flow into exhaust pipe 3, potentially leading to liquid entrainment or liquid seal failure. The top wall installation fundamentally avoids this risk.

[0046] In one embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the connecting pipe 1 of this utility model may include a first pipe body 11, a quick-connect fitting 12, a second pipe body 13, and a connecting flange 14; one end of the first pipe body 11 is installed on the side wall of the liquid storage tank 2, the quick-connect fitting 12 is installed on the end of the first pipe body 11 away from the liquid storage tank 2, one end of the second pipe body 13 is detachably installed on the quick-connect fitting 12, and the connecting flange 14 is installed on the end of the second pipe body 13 away from the quick-connect fitting 12. The connecting flange 14 is used to connect with the pipe to be coated.

[0047] In this way, firstly, the quick-connect coupling 12, with its configuration, enables the second pipe body 13 (together with the mating flange 14 at its end) to quickly and easily connect and disconnect with the quick-connect coupling 12 fixed on the first pipe body 11. This not only effectively improves work efficiency but also reduces the workload of replacement (compared to bolt, clip and other connection methods).

[0048] Secondly, in this embodiment, the connecting pipe 1 is divided into a fixed part (the first pipe body 11 is installed on the liquid storage tank 2) and a detachable part (the second pipe body 13 + the connecting flange 14), which are connected by a quick-connect coupling 12. In this way, the modularity of the device can be effectively improved, and docking, replacement and maintenance can be facilitated.

[0049] In one embodiment of this invention, the second tube 13 can be configured as a flexible tube. This flexible configuration effectively improves the spatial adaptability and ease of connection of this invention. Specifically, in field operations, it is difficult to achieve precise and perfect alignment between the interface position (height, horizontal offset, angle) of the coated pipe and the end position of the first tube 11 fixed to the side wall of the storage tank 2. The flexible tube's bendable and torsion-resistant characteristics allow the second tube 13 to deform freely within a certain range, thus effectively adapting to any working environment and simplifying connection operations.

[0050] In one embodiment of this utility model, such as Figure 1 and Figure 3 As shown, the exhaust pipe 3 of this utility model may include a third pipe body 31, a fourth pipe body 32, a one-way valve 33, a first control valve 34, and a pressure gauge 35; one end of the third pipe body 31 is installed on the top wall of the liquid storage tank 2, one end of the fourth pipe body 32 is connected to the end of the third pipe body 31 away from the liquid storage tank 2, and the other end of the fourth pipe body 32 is used to connect to the flare tower. The one-way valve 33 is set on the third pipe body 31, and the first control valve 34 and the pressure gauge 35 are set on the fourth pipe body 32. The first control valve 34 is located downstream of the pressure gauge 35. The first control valve 34 is used to control the opening and closing of the fourth pipe body 32, and the pressure gauge 35 is used to measure the pressure inside the fourth pipe body 32.

[0051] In this embodiment, firstly, it can effectively prevent dangerous backflow and ensure safety. Specifically, the one-way valve 33 is installed on the third pipe body 31 (i.e., adjacent to the outlet of the storage tank 2). Its function is to allow gas to flow only from the storage tank 2 to the flare tower, and absolutely prevent any fluid from flowing back from the flare tower to the storage tank 2, fundamentally eliminating the risk of gas backflow and avoiding the formation of uncontrollable, potentially explosive gas mixtures in the tank or pipeline.

[0052] Secondly, the first control valve 34 can control the on / off state of the fourth pipe 32. For example, the valve can be closed before the coating operation begins and reopened when exhaust gas needs to be released (such as after the pipeline corrosion inhibitor is added); the valve can also be closed after the operation is completed or before the equipment is moved to prevent accidental leakage of residual gas in the storage tank 2. In addition, in the event of an anomaly (such as abnormally high pressure displayed by the pressure gauge 35, downstream blockage, or a sudden emergency on site), the first control valve 34 can be quickly and manually closed to immediately cut off the gas flow to the flare tower, prevent the situation from escalating, and buy time for emergency response.

[0053] In one embodiment of this invention, the third tube 31 can be configured as a flexible tube. This flexible configuration effectively improves the spatial adaptability and ease of connection of this invention. Specifically, in field operations, there may be a certain spatial misalignment between the exhaust outlet of the storage tank 2 and the delivery pipeline of the flare tower. The flexible tube's bendable and torsional properties allow the third tube 31 to deform freely within a certain range, thus effectively adapting to any working environment and simplifying connection operations.

[0054] In one embodiment of this utility model, such as Figure 1As shown, the gas pipeline coating tail gas recovery device 100 of this utility model may further include a recovery pipe 4. The inlet end of the recovery pipe 4 is connected to the receiving cavity, and the outlet end of the recovery pipe 4 is used to connect to the corrosion inhibitor recovery device. The inlet end of the recovery pipe 4 is positioned lower than the outlet end of the connecting pipe 1. In this way, the active recovery and recycling of the corrosion inhibitor can be achieved through the recovery pipe 4 configured in this way. In addition, the effective volume of the storage tank 2 and the gas-liquid separation efficiency can also be maintained by actively opening the recovery pipe 4.

[0055] In one embodiment of this utility model, such as Figure 1 As shown, the recovery pipe 4 of this utility model may include a fifth pipe body 41 and a second control valve 42. The outlet end of the connecting pipe 1 is installed on the top of the side wall of the storage tank 2, one end of the fifth pipe body 41 is installed on the bottom of the side wall of the storage tank 2, and the second control valve 42 is installed on the fifth pipe body 41 to control the opening and closing of the fifth pipe body 41.

[0056] In this way, the fifth pipe 41 and the second control valve 42, which are configured in this way, can not only effectively ensure the evacuation of the corrosion inhibitor, but also achieve the controlled discharge of the corrosion inhibitor.

[0057] In one embodiment of this utility model, such as Figure 1 As shown, the gas pipeline coating tail gas recovery device 100 of this utility model may further include a mounting frame 5, which is installed at the bottom of the liquid storage tank 2 to support the liquid storage tank 2. In this way, the mounting frame 5 can stably and reliably support the liquid storage tank 2, lift the liquid storage tank 2 off the ground, and prevent it from accidentally overturning, sliding or shifting due to ground conditions.

[0058] In one embodiment of this utility model, such as Figure 1 As shown, the mounting frame 5 of this utility model may include a frame body 51 and casters 52 disposed at the bottom of the frame body 51. The frame body 51 is used to support the liquid storage tank 2. In this way, the frame body 51 and casters 52 configured in this way can not only effectively ensure reliable support for the liquid storage tank 2, but also facilitate the adjustment of the position of the entire gas pipeline coating tail gas recovery device.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gas pipeline coating film tail gas recovery device, characterized in that, It includes a connecting pipe (1), a storage tank (2), and an exhaust pipe (3); the storage tank (2) has a cavity for containing corrosion inhibitor and natural gas, the inlet end of the connecting pipe (1) is connected to the coated pipeline, the outlet end of the connecting pipe (1) is connected to the cavity, the inlet end of the exhaust pipe (3) is connected to the cavity, and the outlet end of the exhaust pipe (3) is connected to the flare tower; The outlet end of the connecting pipe (1) is positioned lower than the inlet end of the exhaust pipe (3).

2. The gas pipeline coating tail gas recovery device according to claim 1, characterized in that, The outlet end of the connecting pipe (1) is installed on the side wall of the liquid storage tank (2), and the inlet end of the exhaust pipe (3) is installed on the top wall of the liquid storage tank (2).

3. The gas pipeline coating film tail gas recovery device according to claim 1, characterized in that, The connecting pipe (1) includes a first pipe body (11), a quick-connect fitting (12), a second pipe body (13), and a connecting flange (14); one end of the first pipe body (11) is installed on the side wall of the liquid storage tank (2), the quick-connect fitting (12) is installed on the end of the first pipe body (11) away from the liquid storage tank (2), one end of the second pipe body (13) is detachably installed on the quick-connect fitting (12), and the connecting flange (14) is installed on the end of the second pipe body (13) away from the quick-connect fitting (12). The connecting flange (14) is used to connect with the coated pipe.

4. The gas pipeline coating film tail gas recovery device according to claim 3, characterized in that, The second tube (13) is configured as a flexible tube.

5. The gas pipeline coating film tail gas recovery device according to claim 1, characterized in that, The exhaust pipe (3) includes a third pipe body (31), a fourth pipe body (32), a one-way valve (33), a first control valve (34), and a pressure gauge (35). One end of the third pipe body (31) is installed on the top wall of the liquid storage tank (2). One end of the fourth pipe body (32) is connected to the end of the third pipe body (31) away from the liquid storage tank (2). The other end of the fourth pipe body (32) is used to connect with the flare tower. The one-way valve (33) is installed on the third pipe body (31). The first control valve (34) and the pressure gauge (35) are installed on the fourth pipe body (32). The first control valve (34) is located downstream of the pressure gauge (35). The first control valve (34) is used to control the opening and closing of the fourth pipe body (32). The pressure gauge (35) is used to measure the pressure inside the fourth pipe body (32).

6. The gas pipeline coating film tail gas recovery device according to claim 5, characterized in that, The third tube (31) is configured as a flexible tube.

7. The gas pipeline coating film tail gas recovery device according to claim 1, characterized in that, The gas pipeline coating tail gas recovery device also includes a recovery pipe (4), the inlet end of the recovery pipe (4) is connected to the receiving cavity, the outlet end of the recovery pipe (4) is used to connect to the corrosion inhibitor recovery device, and the inlet end of the recovery pipe (4) is positioned lower than the outlet end of the connecting pipe (1).

8. The gas pipeline coating film tail gas recovery device according to claim 7, characterized in that, The recovery pipe (4) includes a fifth pipe body (41) and a second control valve (42). The outlet end of the connecting pipe (1) is installed on the top of the side wall of the liquid storage tank (2). One end of the fifth pipe body (41) is installed on the bottom of the side wall of the liquid storage tank (2). The second control valve (42) is installed on the fifth pipe body (41) to control the opening and closing of the fifth pipe body (41).

9. The gas pipeline coating film tail gas recovery device according to claim 1, characterized in that, The gas pipeline coating film tail gas recovery device further comprises a mounting rack (5) arranged at the bottom of the liquid storage tank (2) to support the liquid storage tank (2).

10. The gas pipeline coating film tail gas recovery device according to claim 9, characterized in that, The mounting rack (5) comprises a rack body (51) for supporting the liquid storage tank (2) and a moving wheel (52) arranged at the bottom of the rack body (51).

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