Tubular gas-liquid separator capable of implementing tube cleaning operation

Abstract

The invention provides a tubular gas-liquid separator capable of implementing pigging operation, the tubular gas-liquid separator capable of implementing pigging operation comprises a main body pipeline inlet section, a central pipe, a main body pipeline outlet section, a first sleeve section and a second sleeve section, the main body pipeline inlet section, the central pipe and the main body pipeline outlet section are sequentially communicated along a fluid conveying direction, the first sleeve section and the second sleeve section are sequentially communicated in the fluid conveying direction, the inner diameter of the first sleeve section is smaller than that of the second sleeve section, and the first sleeve section and the second sleeve section are matched with the central pipe to define a stepped separation cavity; the central pipe comprises a slot section, slot holes are formed in the peripheral wall of the slot section, and the central pipe is communicated with the stepped separation cavity through the slot holes; a first-stage liquid phase outlet is formed in the bottom of the second sleeve section and is communicated with the stepped separation cavity. The separator is not provided with a swirling element and is convenient to clean; and the structure of the uniform cloth strip seam holes and the step-shaped separation cavity also has higher separation efficiency under the working conditions of large air volume and high liquid content at an inlet.

Description

Technical Field

[0001] The invention relates to the technical field of tubular gas-liquid separation equipment, and in particular to a tubular gas-liquid separator capable of performing a pipe cleaning operation. Background Art

[0002] When wet natural gas is transported over long distances using pipelines, the accumulation of liquid in the pipe is a key factor restricting the transportation efficiency, transportation distance and flow safety. The accumulation of liquid in the pipe not only increases the pressure loss along the pipeline, but also causes flow safety issues such as hydrate blockage and slug flow in situations such as long-distance gathering and transportation of wet natural gas. When the amount of liquid accumulated in the pipeline is too high, the implementation of pig cleaning operations may even bring great safety hazards to the processing facilities. It is necessary to promptly and proactively separate the gas and liquid and remove the accumulated liquid without affecting the regular cleaning work of long-distance pipelines. Due to the different lengths of gas pipelines, temperature and pressure changes, and terrain conditions, the gas-liquid flow of liquid accumulated in the pipeline often has large gas-liquid ratio fluctuations. The gas-liquid separation equipment that can be cleaned must not only realize online cleaning and internal inspection operations, but also have better adaptability to the fluctuating conditions of the incoming gas and liquid.

[0003] Common undulating pipeline gas-liquid separation is usually based on the principle of cyclone separation. There are often swirling elements inside the pipeline. During the pipeline cleaning operation, the pipe cleaner is blocked by the swirling elements or other separation components and cannot pass through the gas-liquid separator.

[0004] Tubular gas-liquid separators all use swirling elements to enhance the gas-liquid separation effect and improve the adaptability to the fluctuating conditions of the incoming gas-liquid flow, but this also hinders the passage of the pipe cleaner through the gas-liquid separator. In order not to affect the regular implementation of long-distance pipeline cleaning and pipeline inspection operations, some cleanable gas-liquid separators do not have swirling elements on the internal center axis of the main flow pipeline to ensure the smooth passage of the pipe cleaner. Therefore, a reasonable internal structure is crucial to improving the adaptability to the fluctuating conditions of the incoming gas-liquid flow. However, usually, the separation efficiency of this type of cleanable gas-liquid separator is significantly reduced under the working conditions of high liquid content and large gas flow, and the gas-liquid separation effect is poor.

[0005] The applicant has found that the prior art has at least the following technical problems: In summary, in the prior art, the cleanable gas-liquid separator no longer has a swirling element in order not to affect the regular cleaning of long-distance pipelines, pipeline inspection and other operations, but this affects the gas-liquid separation effect, significantly reduces the separation efficiency, and has a poor gas-liquid separation effect. Summary of the invention

[0006] The object of the present invention is to provide a tubular gas-liquid separator capable of implementing a pigging operation, so as to solve the technical problems of low separation efficiency and poor gas-liquid separation effect of pigging gas-liquid separators without a swirl element in the prior art. The preferred technical solutions among the many technical solutions provided by the present invention can produce a number of technical effects as described below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The tubular gas-liquid separator capable of implementing a pigging operation provided by the present invention comprises a main pipeline inlet section, a central pipe, a main pipeline outlet section, a first sleeve section and a second sleeve section, wherein:

[0009] The main pipe inlet section, the central pipe, and the main pipe outlet section are sequentially connected along the fluid conveying direction, the first sleeve section and the second sleeve section are sequentially connected along the fluid conveying direction, the inner diameter of the first sleeve section is smaller than the inner diameter of the second sleeve section, and the two cooperate with the central pipe to enclose a stepped separation chamber;

[0010] The central tube comprises a slit section, a peripheral wall of which is provided with slit holes, and the slit holes connect the central tube with the stepped separation chamber; a primary liquid phase outlet is provided at the bottom of the second sleeve section, and the primary liquid phase outlet is connected with the stepped separation chamber.

[0011] Preferably, the slit holes are only located in the first sleeve section, and the slit holes are arranged at intervals around the central axis of the slit section;

[0012] The number of the slit holes is 8-14.

[0013] Preferably, the inner diameters of the main pipe inlet section, the central pipe, and the main pipe outlet section are equal, and the main pipe inlet section, the central pipe, the main pipe outlet section, the first sleeve section, and the second sleeve section are coaxially arranged;

[0014] The first sleeve section and the second sleeve section are both cylindrical structures.

[0015] Preferably, the piggable gas-liquid separator further comprises a horizontal settling pipe, wherein:

[0016] The axial direction of the horizontal settling pipe is parallel to the axial direction of the central pipe, the primary liquid phase outlet is connected to the horizontal settling pipe, and a secondary liquid phase outlet is provided at the bottom of the horizontal settling pipe.

[0017] Preferably, the piggable gas-liquid separator further comprises a secondary gas phase reflux pipe, wherein:

[0018] The horizontal settling pipe is provided with a secondary gas phase outlet, the secondary gas phase reflux pipe is connected to the secondary gas phase outlet, and the gas outlet of the secondary gas phase reflux pipe is connected to the upper part of the main pipeline outlet section.

[0019] Preferably, the axial direction of the primary liquid phase outlet is 90° to the axial direction of the horizontal sedimentation tube, and the axial direction of the horizontal sedimentation tube is parallel to the axial direction of the central tube; the axial direction of the secondary gas phase reflux pipe is 90° to the axial direction of the main pipeline outlet section.

[0020] Preferably, the number of the first-level liquid phase outlets is more than two, and the first-level liquid phase outlets are symmetrically distributed about the central axis of the second sleeve section. The number of the horizontal sedimentation pipes is arranged in a one-to-one correspondence with the number of the first-level liquid phase outlets, and are distributed on opposite sides of the bottom of the second sleeve section, and each of the horizontal sedimentation pipes is connected to the corresponding second-level gas phase reflux pipe.

[0021] Preferably, the ratio of the length of the slit hole to the overall length of the cleanable gas-liquid separator is 0.6-0.8, and the ratio of the distance from the position of the slit (2) to the end face of the main pipeline inlet section (1) to the inner diameter of the central tube (9) is 0.2-0.5.

[0022] Preferably, the ratio of the inner diameter of the first sleeve section to the inner diameter of the main pipe inlet section is 1.5-2.0, the ratio of the length of the first sleeve section to the length of the main pipe inlet section is 0.8-1.2, the ratio of the inner diameter of the second sleeve section to the inner diameter of the main pipe inlet section is 2.0-2.7, the ratio of the length of the second sleeve section to the length of the main pipe inlet section is 1.8-2.5, and the taper of the transition cone ranges from 120° to 150°.

[0023] The tubular gas-liquid separator capable of performing pipe cleaning operations provided by the present invention has the following beneficial effects compared with the prior art:

[0024] The tubular gas-liquid separator capable of performing pipe cleaning operations does not have a swirling element, and the pipe cleaning device can be inserted into the main pipe inlet section, the center pipe, and the main pipe outlet section to clean the pipe, which is convenient for cleaning.

[0025] The separator has a structure of "uniformly distributed slit holes + stepped separation chamber", which improves the adaptability of the tubular gas-liquid separator under large air volume and high liquid content conditions, while ensuring that it can be used in situations where pigging is implemented. The gas and liquid phases in the separation chamber are initially separated based on the gravity sedimentation effect, which reduces the proportion of the overflow gas phase and reduces the pressure loss, ensuring that the pig can smoothly pass through the main pipeline inlet section, central pipe, and main pipeline outlet section, while ensuring a high separation efficiency under large air volume and high liquid content conditions at the inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure cross-sectional view of the tubular gas-liquid separator capable of implementing a pipe cleaning operation according to the present invention;

[0028] Figure 2 It is a schematic axial view of the overall structure of a tubular gas-liquid separator capable of implementing a pipe cleaning operation according to the present invention;

[0029] Figure 3 It is a schematic axial side view of the slit section structure of the tubular gas-liquid separator capable of implementing the pigging operation of the present invention;

[0030] Figure 4 The present invention is a schematic cross-sectional diagram of a slit section of a tubular gas-liquid separator capable of performing a pipe cleaning operation.

[0031] In the figure, 1, main pipeline inlet section; 2, slit section; 21, slit hole; 3, first sleeve section; 4, second sleeve section; 5, primary liquid phase outlet; 6, secondary gas phase reflux pipe; 7, main pipeline outlet section; 8, horizontal sedimentation pipe; 9, secondary liquid phase outlet; 10, center pipe; 11, secondary gas phase outlet. DETAILED DESCRIPTION

[0032] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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 cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] The embodiment of the present invention provides a tubular gas-liquid separator that can perform pipe cleaning operations. No rotating element is provided. The pipe cleaner can be extended into the inlet section, center pipe, and outlet section of the main pipeline to clean the pipeline, which is convenient for cleaning.

[0035] Combine the following Figure 1-Figure 4 The technical solution provided by the present invention is described in more detail.

[0036] like Figure 1-Figure 4 As shown, the tubular gas-liquid separator capable of implementing pipe cleaning operation provided by the present invention comprises a main pipe inlet section 1, a central pipe 10, a main pipe outlet section 7, a first sleeve section 3 and a second sleeve section 4, wherein: the main pipe inlet section 1, the central pipe 10 and the main pipe outlet section 7 are sequentially connected along the fluid conveying direction, the first sleeve section 3 and the second sleeve section 4 are sequentially connected along the fluid conveying direction, the inner diameter of the first sleeve section 3 is smaller than the inner diameter of the second sleeve section 4, and the two cooperate with the central pipe 10 to enclose a stepped separation chamber; the central pipe 10 comprises a slit section 2, and a slit hole 21 is opened on the peripheral wall of the slit section 2, and the slit hole 21 connects the central pipe 10 with the stepped separation chamber; a primary liquid phase outlet 5 is provided at the bottom of the second sleeve section 4, and the primary liquid phase outlet 5 is connected to the stepped separation chamber.

[0037] See also Figure 1 As shown, the above-mentioned “step-shaped separation chamber” refers to the chamber enclosed between the first sleeve section 3 , the second sleeve section 4 and the central tube 10 .

[0038] The center pipe has the same diameter as the main pipeline inlet section 1 and the main pipeline outlet section. When the pipeline needs to be cleaned, the pig can directly clean through the pipeline.

[0039] The tubular gas-liquid separator capable of performing a pipe cleaning operation does not have a swirling element, and the pipe cleaning device can be inserted into the main pipe inlet section 1, the center pipe, and the main pipe outlet section to clean the pipe, which is convenient for cleaning.

[0040] The separator has a structure of "uniformly distributed slit holes 21 + stepped separation chamber", which improves the adaptability of the tubular gas-liquid separator under large air volume and high liquid content conditions, while ensuring that it is suitable for occasions where pipe cleaning is implemented. Based on the gravity sedimentation effect, the gas and liquid phases in the separation chamber are initially separated, reducing the proportion of the overflow gas phase while reducing the pressure loss, which can ensure that the pipe cleaning device passes smoothly through the main pipeline inlet section 1, the central pipe, and the main pipeline outlet section, while ensuring a high separation efficiency under large air volume and high liquid content conditions at the inlet.

[0041] The tubular gas-liquid separator capable of performing a pipe cleaning operation of the present invention is as follows: Figure 1 As shown, it includes a primary separation unit and a secondary separation unit. The primary separation unit adopts a "circumferentially uniformly distributed slit holes + stepped separation chamber" structure, and the secondary separation unit adopts a "horizontal settling pipe + secondary gas phase reflux pipe" structure. The specific structure includes a stepped sleeve separation chamber including a main pipe inlet section 1, a slit section 2, a first sleeve section 3, a second sleeve section 4, a primary liquid phase outlet 5, a secondary gas phase reflux pipe 6, a main pipe outlet section 7, a horizontal settling pipe 8, a secondary liquid phase outlet 9, a central pipe 10, and a secondary gas phase outlet 11.

[0042] The primary separation unit comprises a main pipeline inlet section 1, a slit section 2, a first sleeve section 3, a second sleeve section 4, a primary liquid phase outlet 5, a main pipeline outlet section 7, and a central pipe 10; the main pipeline inlet section 1 is connected to the first sleeve section 3, the inner diameter of the main pipeline inlet section 1 is smaller than the inner diameter of the first sleeve section 3, the central pipe 10 is located inside the second sleeve section 4, and the inner diameter of the central pipe 10 is consistent with the inner diameter of the main pipeline inlet section 1, so as to ensure the smooth passage of the pig during the pigging operation.

[0043] The central tube 10 is coaxially matched with the first sleeve section 3; a primary liquid phase outlet 5 is installed on the lower wall of the second sleeve section 4, and the number of the primary liquid phase outlets 5 is 2; the main pipe outlet section 7 is connected to the right wall of the second sleeve section 4 and is coaxially matched, and the pipe diameter of the main pipe outlet section 7 is consistent with the pipe diameter of the main pipe inlet section 1, and the above components form a primary separation unit.

[0044] The secondary separation unit comprises a primary liquid phase outlet 5, a secondary gas phase reflux pipe 6, a horizontal sedimentation pipe 8, a secondary liquid phase outlet 9, and a secondary gas phase outlet 11; a horizontal sedimentation pipe 8 is installed below the primary liquid phase outlet 5, and the axial direction of the horizontal sedimentation pipe 8 is parallel to the axial direction of the central pipe 10; the primary liquid phase outlet 5 is connected to the upper wall surface of the horizontal sedimentation pipe 8, and the axial direction of the pipe section of the primary liquid phase outlet 5 is placed at 90° to the axial direction of the horizontal sedimentation pipe 8; the secondary gas phase reflux pipe 6 is connected to the main pipeline outlet section 7, and the outlet of the secondary gas phase reflux pipe 6 is connected to the upper wall surface of the main pipeline outlet section 7, and the axial direction of the secondary gas phase reflux pipe 6 is placed at 90° to the axial direction of the main pipeline outlet section 7; the secondary liquid phase outlet 9 is located at the bottom of the horizontal sedimentation pipe 8, and the above components form a secondary separation unit.

[0045] The beneficial effects of the present invention are as follows: the tubular gas-liquid separator capable of implementing pipe cleaning operations adopts a "twice separation unit" for step-by-step gas-liquid separation based on the gravity sedimentation effect, and adopts "circumferentially uniformly distributed slit holes + stepped separation chamber". On the one hand, as a gas-liquid separator, it actively removes the accumulated liquid in the pipe through two gravity separations and gas phase reflux in the pipe, while ensuring a higher separation efficiency under conditions of a higher gas content. On the other hand, the circumferentially arranged slit holes in the central pipe ensure that the front and rear pressure differences are utilized during the pipe cleaning operation to ensure the smooth operation of the pipe cleaner while reducing the pressure loss along the pipeline. The present invention has the advantages of compact structure, high separation efficiency, stable separation performance, and the ability to implement pipe cleaning operations.

[0046] The ratio of the inner diameter of the first sleeve section 3 to the inner diameter of the main pipeline inlet section 1 is 1.5-2.0, the ratio of the length of the first sleeve section 3 to the length of the main pipeline inlet section 1 is 0.8-1.2, the ratio of the inner diameter of the second sleeve section 4 to the inner diameter of the main pipeline inlet section 1 is 2.0-2.7, the ratio of the length of the second sleeve section 4 to the length of the main pipeline inlet section 1 is 1.8-2.5, and the ratio of the inner diameter of the horizontal settling pipe 8 to the inner diameter of the main pipeline inlet section 1 is 0.7-0.9.

[0047] The length of the horizontal settling pipe 8 is equal to the length of the primary separation unit. The ratio of the inner diameter of the secondary gas phase reflux pipe to the inner diameter of the horizontal settling pipe is 0.4-0.6. The axis of the secondary gas phase reflux pipe is parallel to the inlet section of the main pipeline. Figure 2 shown.

[0048] The inner diameter of the central pipe 10 is equal to the inner diameter of the main pipeline inlet section 1. The ratio of the length of the slit section 2 in the central pipe 10 to the designed pig length is 0.6-0.8, the number is 8-14, the slit sections 2 are distributed along the circumference of the central pipe 10, the central pipe 10 and the main pipeline inlet section 1 are sealed by threads or welding, and the ratio of the distance between the slit section 2 and the main pipeline inlet section 1 to the inner diameter of the central pipe 10 is 0.2-0.5. Figure 3 , 4 shown.

[0049] During operation, the gas-liquid two-phase flow enters from the main pipeline inlet section 1, and when flowing through the slit section 2 of the central tube 10, most of the liquid and part of the gas enter the first sleeve section 3, and the gas-liquid mixture is decelerated in the sleeve section and initially separated by gravity sedimentation; the gas-liquid mixture carrying the reduced liquid continues to enter the second sleeve section 4, further decelerated and fully separated by gravity sedimentation. The liquid phase and a small amount of gas phase settled in the bottom space (step-shaped separation chamber) of the first sleeve section 3 and the second sleeve section 4 enter the horizontal sedimentation pipe 8 through the primary liquid phase outlet 5, and gravity sedimentation separation continues to occur in the space of the pipe section. The settled liquid phase is discharged through the secondary liquid phase outlet 9 at the bottom of the pipe section, and the gas phase is merged into the main pipeline outlet section 7 through the secondary gas phase reflux pipe 6 on the left side of the pipe section, and then continues to be transported forward.

[0050] The tubular gas-liquid separator provided by the present invention can be used for pipe cleaning, and has the following characteristics compared with conventional tubular gas-liquid separators:

[0051] (1) A "two-stage separation unit" is used to perform step-by-step gas-liquid separation. The first separation unit adopts a "circumferentially uniformly distributed slit hole 21 + stepped separation chamber" structure, and the second separation unit adopts a "horizontal sedimentation tube + secondary gas phase reflux tube" structure. While slowing down and rectifying the incoming liquid, the time and space of gravity sedimentation separation are fully increased, achieving efficient separation of gas and liquid in the separation chamber, while reducing the overall pressure loss.

[0052] (2) A drainage slit hole 21 is arranged on the central tube in the stepped separation chamber of the primary separation unit. The central tube 10 has the same inner diameter as the main gas pipeline to ensure smooth passage of the pipe cleaner. The slit hole 21 is only opened on the central tube 10 in the space of the first sleeve section 3 to solve the problem that the settled liquid phase at the bottom of the separation chamber is easy to flow back to the outlet section of the main pipeline, thereby improving the gas-liquid separation efficiency.

[0053] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tubular gas-liquid separator capable of performing pigging operations, characterized in that: It includes a main pipe inlet section, a central pipe, a main pipe outlet section, a first sleeve section and a second sleeve section, wherein: The main pipe inlet section, the central pipe, and the main pipe outlet section are sequentially connected along the fluid conveying direction, the first sleeve section and the second sleeve section are sequentially connected along the fluid conveying direction, the inner diameter of the first sleeve section is smaller than the inner diameter of the second sleeve section, and the two cooperate with the central pipe to enclose a stepped separation chamber; The central tube comprises a slit section, a peripheral wall of which is provided with slit holes, and the slit holes connect the central tube with the stepped separation chamber; a primary liquid phase outlet is provided at the bottom of the second sleeve section, and the primary liquid phase outlet is connected with the stepped separation chamber.

2. The tubular gas-liquid separator capable of performing pigging operations according to claim 1, characterized in that: The slot holes are only located in the first sleeve section, and the slot holes are arranged at intervals around the central axis of the slot section; The number of the slit holes is 8-14.

3. The tubular gas-liquid separator capable of implementing a pigging operation according to claim 1, characterized in that: The main pipe inlet section, the central pipe, and the main pipe outlet section have the same inner diameters, and the main pipe inlet section, the central pipe, the main pipe outlet section, the first sleeve section, and the second sleeve section are coaxially arranged; The first sleeve section and the second sleeve section are both cylindrical structures.

4. The tubular gas-liquid separator capable of implementing a pigging operation according to claim 1, characterized in that: The piggable gas-liquid separator further comprises a horizontal settling pipe, wherein: The axial direction of the horizontal settling pipe is parallel to the axial direction of the central pipe, the primary liquid phase outlet is connected to the horizontal settling pipe, and a secondary liquid phase outlet is provided at the bottom of the horizontal settling pipe.

5. The tubular gas-liquid separator capable of performing pigging operations according to claim 4, characterized in that: The piggable gas-liquid separator further comprises a secondary gas phase reflux pipe, wherein: The horizontal settling pipe is provided with a secondary gas phase outlet, the secondary gas phase reflux pipe is connected to the secondary gas phase outlet, and the gas outlet of the secondary gas phase reflux pipe is connected to the upper part of the main pipeline outlet section.

6. The tubular gas-liquid separator capable of implementing a pigging operation according to claim 5, characterized in that: The axial direction of the primary liquid phase outlet is 90° to the axial direction of the horizontal sedimentation tube, and the axial direction of the horizontal sedimentation tube is parallel to the axial direction of the central tube; the axial direction of the secondary gas phase reflux pipe is 90° to the axial direction of the main pipeline outlet section.

7. The tubular gas-liquid separator capable of implementing a pigging operation according to claim 5, characterized in that: The number of the first-level liquid phase outlets is more than two, and the first-level liquid phase outlets are symmetrically distributed about the central axis of the second sleeve section. The number of the horizontal sedimentation pipes is arranged in a one-to-one correspondence with the number of the first-level liquid phase outlets, and are distributed on opposite sides of the bottom of the second sleeve section, and each of the horizontal sedimentation pipes is connected to the corresponding second-level gas phase reflux pipe.

8. The tubular gas-liquid separator capable of implementing a pigging operation according to claim 1, characterized in that: The ratio of the length of the slit hole to the overall length of the cleanable gas-liquid separator is 0.6-0.8, and the ratio of the distance from the position of the slit (2) to the end face of the main pipeline inlet section (1) to the inner diameter of the central tube (9) is 0.2-0.

5.

9. The tubular gas-liquid separator capable of implementing a pigging operation according to claim 1, characterized in that: The ratio of the inner diameter of the first sleeve section to the inner diameter of the main pipe inlet section is 1.5-2.0, the ratio of the length of the first sleeve section to the length of the main pipe inlet section is 0.8-1.2, the ratio of the inner diameter of the second sleeve section to the inner diameter of the main pipe inlet section is 2.0-2.7, the ratio of the length of the second sleeve section to the length of the main pipe inlet section is 1.8-2.5, and the taper range of the transition cone is 120°-150°.

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