Testing device for slug flow formed by gas-liquid two-phase pipeline

Abstract

The utility model relates to the technical field of pipeline slug flow, in particular to a gas-liquid two-phase pipeline slug flow forming test device, which comprises a transparent horizontal water accumulation pipeline and a camera, and transparent test short-circuit elbows are arranged at two ends of the transparent horizontal water accumulation pipeline. A force transducer is fixedly mounted between the transparent test short-circuit elbow and the transparent horizontal water accumulation pipeline, one end of the force transducer is fixedly connected with a transparent leading-out elbow, the transparent leading-out elbow at one end is fixedly communicated with a gas leading-in pipe, and one end of the gas leading-in pipe is fixedly connected with an air compression pump; and a water collecting tank is arranged at one end of the transparent leading-out elbow at the other end. The gas-liquid two-phase pipeline slug flow forming test device can obtain slug flow forming, slug flow shape, slug flow number, slug flow movement speed and axial impact force borne by the pipeline, can verify theoretical calculation and analog simulation results and correct the theoretical calculation results, and enables theoretical calculation and analog simulation to be more practical.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline slug flow, in particular to a gas-liquid two-phase pipeline forming slug flow test device. Background Art

[0002] With the rapid development of modern industry, pipelines are increasingly used in all walks of life. The intrinsic safety of crude oil pipelines, gas pipelines, industrial pipelines, water supply pipelines, etc. is related to the national economy and people's livelihood. Pipeline slug flow impact accidents occur frequently, and the design, installation, and acceptance of pipelines basically do not consider how to avoid slug flow impact.

[0003] Slug flow formation mechanism: In the pipeline layout, crossings and expansion compensators are often carried out, and local pipelines are inevitably located in low-lying areas. Steam has heat loss in the pipeline, and the steam condenses into liquid and gathers in the low-lying areas of the pipeline; or when the pipeline stops running and is put back into operation, liquid will inevitably gather in the low-lying areas of the pipeline. With the rapid introduction of the medium in the pipeline, the airflow pushes the accumulated liquid to form waves, and the waves block the cross-section of the pipeline to form slug flow. There is a pressure difference between the upstream and downstream of the slug flow in the pipeline. Under the action of the pressure difference, the slug flow accelerates along the straight pipe section and rushes to the downstream pipe elbow. The impact force generated causes the weak part of the pipeline to rupture.

[0004] In order to study the formation law of gas-liquid two-phase slug flow and determine the axial impact force damage law it generates on the pipeline, it is necessary to construct a gas-liquid two-phase pipeline slug flow test device, so as to facilitate the study and observation of the formation of slug flow, the shape of slug flow, the number of slug flow, the movement speed of slug flow, and the test of the impact of slug flow on elbows. Summary of the invention

[0005] The main purpose of the utility model is to overcome the deficiencies in the prior art and provide a gas-liquid two-phase pipeline slug flow test device.

[0006] The technical solution adopted by the utility model to achieve its technical purpose is: a gas-liquid two-phase pipeline slug flow test device, comprising a transparent horizontal water accumulation pipeline and a camera, transparent test short-circuit elbows are arranged at both ends of the transparent horizontal water accumulation pipeline, and a transparent lead-out elbow is fixedly connected to one end of the transparent test short-circuit elbow;

[0007] One of the transparent test short-circuit elbows is plug-in connected to the transparent horizontal water accumulation pipe, and the other transparent test short-circuit elbow is fixedly connected to the transparent horizontal water accumulation pipe. A force sensor is fixedly installed between one of the transparent test short-circuit elbows that is plug-in connected and the transparent horizontal water accumulation pipe. During the axial impact force test, the force sensor is arranged between the transparent horizontal water accumulation pipe and the transparent test short-circuit elbow. Since the two are connected by plug-in, one of the transparent test short-circuit elbows 6 can move under impact force. The force sensor adopts an axial tension and compression S-type sensor to directly measure the axial impact force generated by the slug flow impact elbow on the pipeline.

[0008] One end of the transparent outlet elbow is fixedly connected to a gas introduction pipe, and one end of the gas introduction pipe is fixedly connected to an air compression pump, through which compressed air is introduced into the transparent horizontal water accumulation pipe.

[0009] A water collecting tank is placed at one end of the transparent outlet elbow at the other end;

[0010] The camera is placed toward the transparent horizontal water pipe through a bracket, and the camera can observe: the formation of slug flow in the transparent horizontal water pipe, the shape of the slug flow, the number of slug flow, and the movement speed of the slug flow.

[0011] Preferably, the device further comprises a timer, wherein the timer records the time taken for the slug flow to pass through the transparent outlet elbow.

[0012] Preferably, a gas source control ball valve and a pressure gauge are fixedly installed on the gas introduction pipe, the gas flow is controlled by the gas source control ball valve, and the pressure gauge can display the gas pressure in the gas introduction pipe.

[0013] Preferably, the transparent horizontal water collection pipe is composed of multiple sections of transparent horizontal pipes fixedly connected by flanges;

[0014] The transparent horizontal water accumulation pipe is connected to one of the transparent test short-circuit elbows by means of a slip-on flange insertion, and the slip-on flange can move freely axially.

[0015] Preferably, the transparent horizontal water accumulation pipe is adjusted to a level by a fixed bracket, and the fixed bracket is a common adjustable telescopic bracket, so that the water accumulation height in the multiple sections of transparent horizontal pipes is consistent, and the surfaces of the multiple sections of transparent horizontal pipes are engraved with length and water accumulation height markings.

[0016] The water accumulation height of the transparent horizontal water accumulation pipe can be adjusted by installing a water discharge valve on the surface of the transparent horizontal water accumulation pipe.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The gas-liquid two-phase pipeline slug flow test device can obtain the formation of slug flow, the shape of slug flow, the number of slug flows, the movement speed of slug flow and the axial impact force borne by the pipeline, and can verify the results of theoretical calculation and simulation, and correct the results of theoretical calculation, making the theoretical calculation and simulation more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the slug flow test device for gas-liquid two-phase pipeline.

[0020] Figure 2 A simplified diagram of the slug flow test apparatus for a gas-liquid two-phase pipeline.

[0021] in:

[0022] 1-air compression pump; 2-air source control ball valve; 3-pressure gauge; 4-gas inlet pipe; 5-transparent horizontal water collection pipe; 501-transparent outlet elbow; 6-transparent test short-circuit elbow; 601-force sensor; 7-water collecting tank; 701-timer; 8-camera. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0024] In the description of the present utility model, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] In the description of the present utility model, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, 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 a limitation on the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0027] like Figure 1-2 As shown, a gas-liquid two-phase pipeline slug flow test device comprises a transparent horizontal water accumulation pipeline 5 and a camera 8, and also comprises a timer 701;

[0028] The transparent horizontal water accumulation pipe 5 is composed of multiple sections of transparent horizontal pipes fixedly connected by flanges. The transparent horizontal water accumulation pipe 5 is adjusted to a level by a fixed bracket (not shown in the figure). The fixed bracket is an ordinary adjustable telescopic bracket, so that the water accumulation height in the multiple sections of transparent horizontal pipes is consistent, and the surfaces of the multiple sections of transparent horizontal pipes are engraved with length and water accumulation height markings; the water accumulation height of the transparent horizontal water accumulation pipe 5 is adjusted by installing a drain valve on its surface.

[0029] The camera 8 is placed toward the transparent horizontal water-collecting pipe 5 through a bracket, and the formation of slug flow, the shape of slug flow, the number of slug flow, and the movement speed of slug flow in the transparent horizontal water-collecting pipe 5 can be observed through the camera 8.

[0030] Transparent test short-circuit elbows 6 are provided at both ends of the transparent horizontal water accumulation pipe 5, and one end of the transparent test short-circuit elbow 6 is fixedly connected to a transparent lead-out elbow 501;

[0031] One of the transparent test short-circuit elbows 6 is connected to the transparent horizontal water accumulation pipe 5 by plug-in connection, and the transparent horizontal water accumulation pipe 5 and the transparent test short-circuit elbow 6 are connected by a slip-on flange, and the slip-on flange can move freely axially, and the other transparent test short-circuit elbow 6 is fixedly connected to the transparent horizontal water accumulation pipe 5, and a force sensor 601 is fixedly installed between one of the transparent test short-circuit elbows 6 that are plug-in connected and the transparent horizontal water accumulation pipe 5; during the axial impact force test, the force sensor 601 is arranged between the transparent horizontal water accumulation pipe 5 and the transparent test short-circuit elbow 6. Since the two are connected by a slip-on flange, one of the transparent test short-circuit elbows 6 can move under impact force, so the force sensor 601 adopts an axial tension and compression S-type sensor to directly measure the axial impact force generated by the slug flow impact elbow on the pipeline.

[0032] A transparent outlet elbow 501 at one end is fixedly connected to a gas inlet pipe 4, and an air compression pump 1 is fixedly connected to one end of the gas inlet pipe 4. Compressed air is introduced into the transparent horizontal water accumulation pipe 5 through the air compression pump 1. An air source control ball valve 2 and a pressure gauge 3 are fixedly installed on the gas inlet pipe 4. The gas flow rate is controlled by the air source control ball valve 2, and the pressure gauge 3 can display the gas pressure in the gas inlet pipe 4.

[0033] A water collecting tank 7 is placed at one end of the other end of the transparent outlet elbow 501, and a timer 701 records the time for the slug flow to pass through the transparent outlet elbow 501. By coordinating the transparent test short-circuit elbow 6, the transparent outlet elbow 501 and the timer 701, the shape and time of the slug flow passing through the elbow are observed, and finally the slug flow flows into the water collecting tank 7.

[0034] The working principle and specific use process of the gas-liquid two-phase pipeline slug flow test device:

[0035] The air pressure of the air compressor pump 1 is adjusted to 0.1-0.2Mpa, the inner diameter of the gas introduction pipe 4 is set to 100mm, and then compressed air is introduced into the transparent horizontal water accumulation pipe 5 through the air compressor pump 1. The gas source control ball valve 2 controls the gas flow, and the gas enters the transparent horizontal water accumulation pipe 5 from top to bottom. The transparent horizontal water accumulation pipe 5 is set to 8 sections × 3 meters (total length 24m), with an outer diameter of 110mm and an inner diameter of 100mm. The multiple sections of the transparent horizontal water accumulation pipe 5 are fixed by flanges or clamps and evenly arranged on 8 fixed brackets. The brackets are adjusted horizontally to make the water accumulation height in the pipe consistent, and the multiple sections of the transparent horizontal pipes have length and water accumulation height marks. The water accumulation height is adjusted by installing a drain valve on the transparent horizontal water accumulation pipe 5;

[0036] Then, during the whole test, the camera 8 records the video frame by frame for analysis, and the force sensor 601 is used to directly measure the axial impact force of the slug flow impacting the elbow on the pipeline, collects the impact force data, and cooperates with the transparent test short-circuit elbow 6, the transparent lead-out elbow 501 and the timer 701 to observe the shape and time of the slug flow passing through the elbow, and finally the slug flow flows into the water tank;

[0037] Finally, a gas-liquid two-phase pipeline slug flow test device was constructed and compressed gas was used to drive the water in the transparent pipeline to form a slug flow. The formation of the slug flow, the shape of the slug flow, the number of slug flows, and the movement speed of the slug flow were observed and recorded. The impact force of the slug flow on the elbow was tested, so as to study the formation law of the gas-liquid two-phase slug flow and determine the axial impact force damage law it generated on the pipeline.

[0038] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structures, equivalent processes or equivalent functional transformations made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the scope of protection of the utility model patent.

Claims

1. A gas-liquid two-phase pipeline slug flow test device, characterized in that: It comprises a transparent horizontal water accumulation pipe (5) and a camera (8), wherein transparent test short-circuit elbows (6) are provided at both ends of the transparent horizontal water accumulation pipe (5), and one end of the transparent test short-circuit elbow (6) is fixedly connected to a transparent lead-out elbow (501); One of the transparent test short-circuit elbows (6) is pluggably connected to the transparent horizontal water-collecting pipe (5), and the other transparent test short-circuit elbow (6) is fixedly connected to the transparent horizontal water-collecting pipe (5), and a force sensor (601) is fixedly installed between the one of the transparent test short-circuit elbows (6) that is pluggably connected and the transparent horizontal water-collecting pipe (5); The transparent outlet elbow (501) at one end is fixedly connected to a gas introduction pipe (4), one end of the gas introduction pipe (4) is fixedly connected to an air compression pump (1), and a water collecting tank (7) is placed at one end of the transparent outlet elbow (501) at the other end; The camera (8) is placed toward the transparent horizontal water collection pipe (5) via a bracket.

2. A gas-liquid two-phase pipeline slug flow test device according to claim 1, characterized in that: A timer (701) is also included, and the timer (701) records the time when the slug flow passes through the transparent outlet elbow (501).

3. The gas-liquid two-phase pipeline slug flow test device according to claim 1, characterized in that: A gas source control ball valve (2) and a pressure gauge (3) are fixedly mounted on the gas introduction pipe (4).

4. The gas-liquid two-phase pipeline slug flow test device according to claim 1, characterized in that: The transparent horizontal water accumulation pipe (5) is composed of multiple sections of transparent horizontal pipes fixedly connected by flanges; The transparent horizontal water collection pipe (5) is connected to one of the transparent test short-circuit elbows (6) by means of a slip-on flange.

5. The gas-liquid two-phase pipeline slug flow test device according to claim 1, characterized in that: The transparent horizontal water accumulation pipe (5) is adjusted to a horizontal level by means of a fixed bracket, and the surfaces of the multiple sections of the transparent horizontal pipe are engraved with length and water accumulation height markings.

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