A gas-liquid separation apparatus

Abstract

This invention discloses a gas-liquid separation device, including a tubular gas-liquid separator, an underflow pipe, an overflow pipe, an inclined inlet pipe, and a mist eliminator. The tubular gas-liquid separator includes a vertical separation cylinder with a gas phase outlet at the top and a liquid phase outlet at the bottom, and a feed inlet on the side. The mist eliminator is installed at the inner top of the separation cylinder. A gradually expanding overflow pipe is installed at the gas phase outlet of the separation cylinder, and the overflow pipe is connected to a gas transmission pipeline. The lower opening of the overflow pipe has a gradually expanding structure. The beneficial effects of this invention are: the gradually expanding overflow pipe at the top of the separation cylinder increases the external swirling area of ​​the separation cylinder, increases the separation space, and its recessed bottom structure reduces the short-circuit flow, effectively avoiding the "overflow and coarse flow" phenomenon, resulting in more accurate metering results.

Description

Technical Field

[0001] This invention relates to gas-liquid separation technology, and more specifically to a gas-liquid separation device. Background Technology

[0002] A gas-liquid cyclone (GLCC) is a gas-liquid separation device used in onshore and deep-sea oil and gas production systems. It is mainly used for gas-liquid separation in condensate gas production systems. It can also be used to control the gas-oil ratio in production systems, greatly improving the performance of devices such as multiphase flow meters, multiphase pumps, vented natural gas scrubbers, liquid plug traps, and container separators.

[0003] Currently, traditional tubular gas-liquid separators utilize centrifugal force to achieve two-phase separation. The gas-liquid mixture undergoes pre-separation in an inclined tube and then enters a vertical cylindrical section along a tangential inlet, forming a strong vortex. The resulting centrifugal force is far greater than gravity. Under the influence of the gas-liquid density difference, the liquid phase swirls along the tube wall and enters the liquid phase outlet at the bottom of the cylinder, while the gas enters the center of the cylinder vortex, forming an inverted conical vortex surface, and separates out from the top gas phase outlet, thus achieving gas-liquid separation. However, this type of separator is prone to problems such as incomplete venting at the overflow port and carry-out of the liquid phase from the upper separated cylinder, resulting in low separation efficiency. Furthermore, the carry-out of the liquid phase accelerates the corrosion rate of the equipment and can easily reduce the accuracy of pipeline metering elements. Summary of the Invention

[0004] The purpose of this invention is to provide a gas-liquid separation device with high separation efficiency and accurate metering, addressing the shortcomings of existing technologies.

[0005] The technical solution adopted in this invention is as follows: a gas-liquid separation device, comprising a tubular gas-liquid separator, an underflow pipe, an overflow pipe, an inclined inlet pipe, and a mist eliminator; the tubular gas-liquid separator includes a vertical separation cylinder, with a gas phase outlet at the top and a liquid phase outlet at the bottom, and a feed inlet on the side of the separation cylinder; the mist eliminator is installed at the inner top of the separation cylinder; a gradually expanding overflow pipe is installed at the gas phase outlet of the separation cylinder, the overflow pipe is connected to a gas delivery pipeline, and a gas phase meter is installed on the gas delivery pipeline; the liquid phase outlet of the separation cylinder is connected to a horizontal underflow pipe, the horizontal underflow pipe is connected to a liquid delivery pipeline, and a liquid phase meter is installed on the liquid delivery pipeline; the feed inlet of the separation cylinder is connected to the lower end of the inclined inlet pipe, the upper end of the inclined inlet pipe is connected to the outlet of a gas-liquid mixing cylinder, and the inlet of the gas-liquid mixing cylinder is connected to a gas-liquid mixing conveying pipe.

[0006] According to the above scheme, the diameter of the lower opening of the overflow pipe gradually increases along the direction of fluid flow.

[0007] According to the above scheme, the lower end of the overflow pipe is inserted into the separation cylinder.

[0008] According to the above scheme, the inner wall of the separator cylinder above the feed inlet is provided with an arc-shaped protrusion.

[0009] According to the above scheme, the side of the separation cylinder is provided with several feed inlets, each feed inlet is configured with an inclined inlet pipe, and the upper ends of the several inclined inlet pipes are all connected to the outlet of the same gas-liquid mixing cylinder; the inclined inlet pipe is equipped with a regulating valve.

[0010] According to the above scheme, the inclination angle of the inclined inlet pipe is 25° to 30°.

[0011] According to the above scheme, the outlets of the liquid delivery pipeline and the gas delivery pipeline are both connected to the inlet of the mixing pipeline, and the outlet of the mixing pipeline is connected to the inlet of the mixer.

[0012] According to the above scheme, the fog-catching device is a multi-stage three-dimensional fog-catching device, which includes several mesh fog catchers installed sequentially along the height direction, with each mesh fog catcher arranged alternately vertically.

[0013] According to the above scheme, each mesh fog eliminator includes four cross-arranged fog eliminator plates. The two adjacent fog eliminator plates form a certain angle, with the minimum angle ranging from 20° to 40°. The fog eliminator plates are provided with mesh holes, and the fog eliminator plates of two adjacent levels overlap. The overlapping parts of each level connect from bottom to top to form an S-shaped flow surface.

[0014] According to the above scheme, each wire mesh of the three-stage three-dimensional fog-collecting device is made of a mesh material.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The present invention provides a gradually expanding overflow pipe at the top of the separation cylinder, which increases the swirling area outside the separation cylinder and increases the separation space. Its bottom recessed structure reduces the short-circuit flow rate, effectively avoiding the phenomenon of "overflow and coarse flow", and the measurement results are more accurate.

[0017] 2. This invention includes an underflow pipe at the lower end of the separation cylinder, connected to a liquid phase metering instrument. For normal operation of the separation cylinder, the liquid level inside should be maintained below the inlet to prevent gas from blowing over the liquid phase and carrying liquid into the gas flow. As the liquid flow rate increases, the liquid level in the separation cylinder rises, necessitating consideration of the equilibrium liquid level. Therefore, the pressure balance between the liquid phase outlet and the gas phase outlet of the separation cylinder must ensure that the height of the equilibrium liquid level in the separation cylinder is approximately 400mm below the inlet, ensuring accurate data acquisition and measurement by the liquid phase metering instrument connected to the outlet pipe.

[0018] 3. The present invention is provided with multiple downward tangential inlet pipes to divert the flow at the inlet of the separation cylinder; compared with inlet pipes with curved pipes, the speed loss of the inclined pipes is lower; an arc-shaped protrusion is provided at the upper part of the inlet of the separation cylinder, which increases the roughness of the inner surface of the cylinder and suppresses the upward flow of liquid phase at the feed inlet.

[0019] 4. The present invention is equipped with a multi-stage three-dimensional mist-catching device made of a mesh-like material, which can increase the nucleation sites of the liquid phase; the mist-catching device is arranged in a three-stage three-dimensional arrangement, with each stage interleaved to increase the gas-liquid separation efficiency and ensure that the gas phase meter connected to the overflow port obtains more accurate data. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a specific embodiment of the present invention.

[0021] Figure 2 This is a structural diagram of the multi-stage three-dimensional fog-collecting device in this embodiment.

[0022] Figure 3 This is a top view of the multi-stage three-dimensional fog-collecting device in this embodiment.

[0023] Figure 4 This is a schematic diagram of the overflow pipe in this embodiment.

[0024] Figure 5 This is a schematic diagram of the arc-shaped protrusion on the inner wall of the separation cylinder in this embodiment.

[0025] The components include: 1. Tubular gas-liquid separator; 1.1 Separation cylinder; 1.2 Underflow pipe; 1.3 Overflow pipe; 1.4 Inclined inlet pipe; 1.5 Mist eliminator; 1.5.1 Mist eliminator screen; 1.6 Arc-shaped protrusion; 2. Gas-liquid mixing cylinder; 2.1 Gas-liquid mixing conveying pipe; 2.2 Regulating valve; 3. Gas phase meter; 3.1 Gas phase regulating valve; 3.2 Gas delivery pipeline; 4. Liquid phase meter; 4.1 Liquid regulating valve; 4.2 Liquid delivery pipeline; 5. Mixer; 5.1 Mixing pipeline. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1The illustrated gas-liquid separation device includes a tubular gas-liquid separator, an underflow pipe 1.2, an overflow pipe 1.3, an inclined inlet pipe 1.4, and a mist eliminator 1.5. The tubular gas-liquid separator 1.2 includes a vertical separation cylinder 1.1, with a gas phase outlet at the top and a liquid phase outlet at the bottom, and a feed inlet on the side. The mist eliminator 1.5 is installed at the inner top of the separation cylinder 1.1. The overflow pipe 1.3 is installed at the gas phase outlet of the separation cylinder 1.1. The overflow pipe 1.3 is connected to the gas transmission pipe 3.2, and a gas phase meter 3 is installed on the gas transmission pipe 3.2; the liquid phase outlet of the separation cylinder 1.1 is connected to the horizontal underflow pipe 1.2, the horizontal underflow pipe 1.2 is connected to the liquid transmission pipe 4.2, and a liquid phase meter 4 is installed on the liquid transmission pipe 4.2; the feed inlet of the separation cylinder 1.1 is connected to the lower end of the inclined inlet pipe 1.4, the upper end of the inclined inlet pipe 1.4 is connected to the outlet of the gas-liquid mixing cylinder 2, and the inlet of the gas-liquid mixing cylinder 2 is connected to the gas-liquid mixing conveying pipe 2.1.

[0028] In this invention, for the normal operation of the separation cylinder 1.1, the liquid level inside the separation cylinder 1.1 should be maintained below the feed inlet to prevent gas from blowing over the liquid phase and carrying liquid into the gas flow. As the liquid flow rate increases, the liquid level inside the separation cylinder 1.1 rises, at which point the equilibrium liquid level needs to be considered. The pressure balance between the underflow pipe 1.2 and the overflow pipe 1.3 of the separation cylinder 1.1 must ensure that the height of the equilibrium liquid level in the separation cylinder 1.1 is approximately 400 mm below the feed inlet. A gas phase regulating valve 2.2 is installed on the gas pipeline 3.2, and a liquid regulating valve 4.1 is installed on the liquid pipeline 4.2.

[0029] Preferably, such as Figure 4 As shown, the lower opening of the overflow pipe 1.3 has a gradually expanding structure, that is, a trumpet-shaped structure, with the diameter gradually increasing along the fluid flow direction. The lower opening of the overflow pipe 1.3 is inserted into the separation cylinder 1.1. In this embodiment, the minimum diameter of the overflow pipe 1.3 is 48 mm, and the depth to which the lower opening of the overflow pipe 1.3 is inserted into the separation cylinder 1.1 is 140 mm.

[0030] Preferably, such as Figure 4 As shown, the inner wall of the separation cylinder 1.1 above the feed inlet is provided with an arc-shaped protrusion 1.6. Under the action of the arc-shaped protrusion 1.6, the roughness of the inner surface of the separation cylinder 1.1 is increased, which suppresses the upward flow of liquid phase at the feed inlet.

[0031] Preferably, the side of the separation cylinder 1.1 is provided with several feed inlets, each feed inlet is provided with an inclined inlet pipe 1.4, and the upper ends of the several inclined inlet pipes 1.4 are all connected to the outlet of the same gas-liquid mixing cylinder 2; the inclined inlet pipe 1.4 is provided with a regulating valve 2.2.

[0032] Preferably, the inclination angle of the inclined inlet pipe 1.4 is 27° to 30°.

[0033] This invention employs multiple downward-sloping inclined inlet pipes 1.4 to divert the flow at the inlet of the separation cylinder 1.1; compared to existing inlet pipes with curved sections, the inclined pipes exhibit lower velocity loss. In this embodiment, there are three inclined inlet pipes 1.4.

[0034] Preferably, the outlets of the infusion pipeline 4.2 and the gas pipeline 3.2 are both connected to the inlet of the mixing pipeline 5.1, and the outlet of the mixing pipeline 5.1 is connected to the inlet of the mixer 5.

[0035] Preferably, such as Figure 2 and Figure 3 As shown, the mist-catching device 1.5 is a multi-stage three-dimensional mist-catching device, which includes several mesh mist catchers installed sequentially along the height direction. Each mesh mist catcher includes four cross-arranged mist-catching mesh plates 1.5.1. Adjacent mist-catching mesh plates form a certain angle, with a minimum angle range of 20° to 40°. The mist-catching mesh plates 1.5.1 have mesh holes, and the mist-catching mesh plates 1.5.1 of two adjacent stages overlap. The overlapping parts of each stage connect from bottom to top to form an S-shaped flow surface. This structure allows the gas phase to move along the S-shaped flow surface to the overflow pipe and increases the nucleation sites of the liquid phase, reducing the liquid carryover rate of the gas phase.

[0036] In this embodiment, the fog-catching device 1.5 includes three mesh fog catchers.

[0037] In this invention, each of the mesh fog catchers in the fog catching device 1.5 is made of a mesh material, and the fog catching mesh plate 1.5.1 can increase the nucleation sites of the liquid phase; the arrangement adopts a multi-level three-dimensional arrangement, with staggered arrangement between each level, and the fog catching mesh plates 1.5.1 of two adjacent levels partially overlap, which reduces the liquid carryover rate of the gas phase, increases the gas-liquid separation efficiency, and ensures that the gas phase metering device 3 connected to the overflow port obtains accurate data.

[0038] The working principle of this invention is as follows: A gas-liquid mixture is collected from the well and enters the gas-liquid mixing cylinder 2 via the gas-liquid mixing delivery pipe 2.1. It then flows into the separation cylinder 1.1 through three inclined inlet pipes 1.4, forming a micro-swirling flow field. The gas and liquid phases are separated. The gas phase flows out through the overflow pipe 1.3 into the gas delivery pipeline 3.2, while the liquid phase flows out through the bottom outlet into the liquid delivery pipeline 4.2. Gas flow meters and liquid flow meters are respectively installed in the gas delivery pipeline 3.2 and the liquid delivery pipeline 4.2 to measure the flow rates of the two phases. After measurement, the gas and liquid phases are sent to the mixer 5 via pipelines. During this process, the arc-shaped protrusion 1.6 at the inlet of the separation cylinder 1.1 increases the internal roughness of the vertical separation cylinder 1.1, reducing the upward flow of the liquid phase. During the upward movement of the gas phase, it passes through a three-stage three-dimensional mist eliminator 1.5, reducing the liquid content of the gas phase. This gas-liquid separation system greatly improves separation efficiency, reduces the phenomenon of liquid carrying over the gas phase, and improves the accuracy of the metering data for each phase.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0040] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas-liquid separation device, characterized in that, The system includes a tubular gas-liquid separator, an underflow pipe, an overflow pipe, an inclined inlet pipe, and a mist eliminator. The tubular gas-liquid separator comprises a vertical separation cylinder with a gas phase outlet at the top, a liquid phase outlet at the bottom, and a feed inlet on the side. The mist eliminator is installed at the inner top of the separation cylinder. The gas phase outlet of the separation cylinder is equipped with a gradually expanding overflow pipe connected to a gas delivery pipeline, on which a gas phase meter is installed. The liquid phase outlet of the separation cylinder is connected to a horizontal underflow pipe, which is connected to a liquid delivery pipeline, on which a liquid phase meter is installed. The feed inlet of the separation cylinder is connected to the lower end of the inclined inlet pipe, the upper end of the inclined inlet pipe is connected to the outlet of a gas-liquid mixing cylinder, and the inlet of the gas-liquid mixing cylinder is connected to a gas-liquid mixing conveying pipe. The fog-catching device is a multi-stage three-dimensional fog-catching device, which includes several mesh fog catchers installed sequentially along the height direction, with each mesh fog catcher arranged alternately vertically. Each mesh fog eliminator includes four cross-arranged fog eliminator plates. The two adjacent fog eliminator plates form a certain angle, with the minimum angle ranging from 20° to 40°. The fog eliminator plates are provided with mesh holes, and the fog eliminator plates of two adjacent levels overlap. The overlapping parts of each level connect from bottom to top to form an S-shaped flow surface.

2. The gas-liquid separation device as described in claim 1, characterized in that, The diameter of the lower opening of the overflow pipe gradually increases along the direction of fluid flow.

3. The gas-liquid separation device as described in claim 2, characterized in that, The lower end of the overflow pipe is inserted into the separation cylinder.

4. The gas-liquid separation device as described in claim 1, characterized in that, The inner wall of the separator cylinder above the feed inlet is provided with an arc-shaped protrusion.

5. The gas-liquid separation device as described in claim 1, characterized in that, The separation cylinder has several feed inlets on its side, each feed inlet is equipped with an inclined inlet pipe, and the upper ends of the inclined inlet pipes are all connected to the outlet of the same gas-liquid mixing cylinder; the inclined inlet pipe is equipped with a regulating valve.

6. The gas-liquid separation device as described in claim 4, characterized in that, The inclination angle of the inclined inlet pipe is 25°~30°.

7. The gas-liquid separation device as described in claim 1, characterized in that, The outlets of both the liquid delivery pipeline and the gas delivery pipeline are connected to the inlet of the mixing pipeline, and the outlet of the mixing pipeline is connected to the inlet of the mixer.

8. The gas-liquid separation device as described in claim 5, characterized in that, Each wire mesh of the multi-stage three-dimensional fog-catching device is made of nickel foam material.

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