Double-screw-channel gas-liquid separation device

Abstract

The invention discloses a double-screw-channel gas-liquid separation device which comprises an upper cylinder module and a lower cylinder module, and the upper cylinder module and the lower cylinder module are vertically arranged and fixedly connected. According to the double-screw-channel gas-liquid separation device, by additionally arranging the inner screw channel and the outer screw channel, accurate control over the fluid track is achieved, multi-stage separation is achieved in the flow channels with the same length, and equivalently, under the condition that the structural size is not changed, the flow channels are prolonged, the fluid collision probability is increased, the retention time is prolonged, and the gas-liquid separation efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas separation equipment such as petroleum and natural gas, associated gas, shale gas, etc., and relates to a double-screw gas-liquid separation device. Background Art

[0002] The raw natural gas extracted from the formation generally contains oil and water, and some also carry solid particles. In order to meet the needs of medium transportation, two-phase or three-phase separation equipment is required. The cyclone separation structure is a common gas-liquid separation structure. In the initial separation section of the slug flow separator, most of the liquid and solid particles can be separated. However, the existing cyclone structure is only a simplified cyclone structure composed of a tangential inlet and a central cylinder. There is no clear flow channel, and the fluid runs in only a general direction without forming a regular movement, so the gas-liquid separation effect is limited. With the deepening of gas field development, the working conditions are becoming more and more complex. It is necessary to optimize and innovate the original separation equipment to cope with the increasing amount of liquid carried by the raw gas in the gas field, and even the entrained solid particles, so as to further meet the on-site needs of the oil and gas fields, improve the separation efficiency, and continuously improve the natural gas processing technology and the level of oil field ground construction. Summary of the invention

[0003] The purpose of the present invention is to provide a double-screw gas-liquid separation device, which solves the problem of insufficient separation of the existing cyclone gas-liquid separation structure.

[0004] The technical solution adopted by the present invention is that the double-screw gas-liquid separation device comprises an upper cylinder module and a lower cylinder module, wherein the upper cylinder module and the lower cylinder module are arranged vertically and are fixedly connected to each other.

[0005] The present invention is also characterized in that:

[0006] The upper cylinder module includes a cylindrical body, and the lower cylinder module includes a cyclone cylinder, and the lower end of the cylindrical body is fixedly connected to the larger end surface of the cyclone cylinder;

[0007] The upper cylinder module includes a cylinder and a gas pipeline. The upper end surface of the cylinder is provided with a through hole matching the gas pipeline. The gas pipeline is partially inserted into the cylinder. The cylinder is fixedly connected to the outer wall of the gas pipeline. An outer spiral is provided between the gas pipeline and the cylinder. The axis of the outer spiral coincides with the axis of the gas pipeline.

[0008] A central axis is provided inside the gas pipeline, a gas outlet is provided at the top of the gas pipeline, a support rod is horizontally welded at one end of the central axis close to the gas outlet, the middle of the support rod is welded to the central axis, and both ends of the support rod are welded to the inner wall of the gas pipeline, an inner spiral body is provided between the gas pipeline and the central axis, and the axis of the inner spiral body coincides with the axis of the central axis;

[0009] The outer wall of the cylinder is provided with a tangential inlet;

[0010] The lower cylinder module comprises a cyclone cylinder, which is in the shape of a hollow truncated cone, and a liquid outlet is arranged at the smaller end surface of the cyclone cylinder;

[0011] The outer spiral is welded to the outer wall of the gas pipeline and connected to the inner wall of the cylinder;

[0012] The inner spiral is welded to the outer wall of the central shaft and connected to the inner wall of the gas pipeline;

[0013] A gas baffle is provided at one end of the outer spiral body close to the gas outlet, and the gas baffle is horizontally arranged on the inner wall of the cylinder, and the diameter of the gas baffle matches the inner diameter of the cylinder;

[0014] The tangential inlet is horizontally arranged below the gas baffle, and the tangential inlet is connected with the cylinder;

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a double-screw channel gas-liquid separation device, which realizes precise control of fluid trajectory by adding inner and outer screw channels, and realizes multi-stage separation in the flow channel of the same length, which is equivalent to extending the flow channel under the condition of unchanged structural dimensions, increasing the probability of fluid collision, increasing the residence time, and improving the gas-liquid separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a double-screw channel gas-liquid separation device of the present invention;

[0018] Figure 2 It is a schematic diagram of the tangential inlet structure of a double-screw gas-liquid separation device of the present invention;

[0019] In the figure, 1. gas outlet, 2. central axis, 3. gas baffle, 4. tangential inlet, 5. outer spiral body, 6. inner spiral body, 7. cylinder, 8. cyclone, 9. liquid outlet, 10. gas pipeline, 11. support rod. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The present invention provides a double-screw gas-liquid separation device, such as Figure 1As shown, the whole is divided into two parts, the upper part includes a cylinder 7 and a gas pipeline 10. The upper end surface of the cylinder 7 is provided with a through hole matching the gas pipeline 10. The gas pipeline 10 is partially inserted into the cylinder 7. The gas pipeline 10 and the cylinder 7 are welded at the joint, which is convenient for fixing the gas pipeline 10. An outer spiral 5 is provided between the gas pipeline 10 and the cylinder 7. The axis of the outer spiral 5 coincides with the axis of the gas pipeline 10. The outer spiral 5 is spiral-shaped. The outer spiral 5 is welded to the outer wall of the gas pipeline 10 and connected to the inner wall of the cylinder 7. A central axis 2 is provided inside the gas pipeline 10, and a gas outlet 1 is provided at the top of the gas pipeline 10, which is convenient for gas to flow out from the gas outlet 1. A support rod 11 is horizontally welded at one end of the central axis 2 close to the gas outlet 1. The middle part of the support rod 11 is welded to the central axis 2, and the two ends of the support rod 11 are welded to the inner wall of the gas pipeline 10, which is convenient for fixing the central axis 2. An inner spiral body 6 is provided between the gas pipeline 10 and the central axis 2 . The inner spiral body 6 is spiral-shaped and welded to the outer wall of the central axis 2 , connected to the inner wall of the gas pipeline 10 , and the axis of the inner spiral body 6 coincides with the axis of the central axis 2 .

[0022] The lower part includes a cyclone 8, which is in the shape of a hollow truncated cone. A liquid outlet 9 is provided at the smaller end face of the cyclone 8 to facilitate the outflow of heavy medium in the gas. The lower end of the cylinder 7 is fixedly connected to the larger end face of the cyclone 8. A gas baffle 3 is provided at one end of the outer spiral 5 close to the gas outlet 1. The gas baffle 3 is horizontally arranged on the inner wall of the cylinder 7. The diameter of the gas baffle 3 matches the inner diameter of the cylinder 7, so as to ensure that when the gas enters the cylinder 7, it flows downward along the outer spiral 5.

[0023] like Figure 2 As shown, a tangential inlet 4 is provided on the outer wall of the cylinder 7, and the tangential inlet 4 is horizontally arranged below the gas baffle 3. The tangential inlet 4 is communicated with the cylinder 7, ensuring that the gas enters the cylinder 7 through the tangential inlet 4 and flows downward along the outer spiral 5.

[0024] The present invention is a double-screw gas-liquid separation device, and its working principle is:

[0025] like Figure 1 As shown, a gas tangential inlet 4 is provided on the upper outer wall of the cylinder 7, and an outer spiral body 5 is added at the entrance position of the tangential inlet 4, as shown in FIG. Figure 2 As shown in the figure, after the fluid enters along the tangential inlet 4, it changes from linear motion to circular motion, and the fluid spirals downward along a predetermined trajectory and flows toward the lower cyclone 8, which is called external cyclone. When the fluid contacts the inner wall of the cylinder 7, it loses its inertial force and slides down along the inner wall of the cylinder 7 by the kinetic energy at the inlet and the downward gravity, and flows out from the liquid outlet 9. When the rotating and descending external cyclone reaches the cyclone 8, it moves toward the center due to the contraction of the cyclone 8. When the airflow reaches a certain position at the lower end of the cyclone 8, it reverses from bottom to top in the same rotation direction.

[0026] When the gas after the initial separation rotates and flows upward, an inner spiral body 6 is set in the gas pipeline 10 to make the gas continue to flow in a spiral shape along the set orbit, forming an inner spiral airflow, and performing secondary gas-liquid separation. The gas is discharged from the gas outlet 1, and the liquid flows down along the inner wall of the gas pipeline 10 and finally flows out along the liquid outlet 9.

[0027] Example 1

[0028] like Figure 1 As shown, a double-screw gas-liquid separation device proposed in this embodiment includes an upper cylinder module and a lower cylinder module, wherein the upper cylinder module and the lower cylinder module are arranged vertically and are fixedly connected to each other.

[0029] Example 2

[0030] like Figure 1 As shown, a double-screw gas-liquid separation device proposed in this embodiment includes an upper cylinder module and a lower cylinder module, wherein the upper cylinder module and the lower cylinder module are arranged vertically and are fixedly connected to each other.

[0031] The upper cylinder module includes a cylindrical body 7 , and the lower cylinder module includes a cyclone cylinder 8 . The lower end of the cylindrical body 7 is fixedly connected to the larger end surface of the cyclone cylinder 8 .

[0032] Example 3

[0033] like Figure 1 As shown, a double-screw gas-liquid separation device proposed in this embodiment includes an upper cylinder module and a lower cylinder module, wherein the upper cylinder module and the lower cylinder module are arranged vertically and are fixedly connected to each other.

[0034] The upper cylinder module includes a cylinder 7 , and the lower cylinder module includes a cyclone cylinder 8 . The lower end of the cylinder 7 is fixedly connected to the larger end surface of the cyclone cylinder 8 .

[0035] The upper cylinder module includes a cylinder 7 and a gas pipeline 10. The upper end surface of the cylinder 7 is provided with a through hole matching the gas pipeline 10. The gas pipeline 10 is partially inserted into the cylinder 7. The cylinder 7 is fixedly connected to the outer wall of the gas pipeline 10. An outer spiral 5 is provided between the gas pipeline 10 and the cylinder 7. The axis of the outer spiral 5 coincides with the axis of the gas pipeline 10.

[0036] A central axis 2 is provided inside the gas pipeline 10, a gas outlet 1 is provided at the top of the gas pipeline 10, a support rod 11 is horizontally welded to one end of the central axis 2 close to the gas outlet 1, the middle of the support rod 11 is welded to the central axis 2, and both ends of the support rod 11 are welded to the inner wall of the gas pipeline 10, an inner spiral body 6 is provided between the gas pipeline 10 and the central axis 2, and the axis of the inner spiral body 6 coincides with the axis of the central axis 2;

[0037] A tangential inlet 4 is provided on the outer wall of the cylindrical body 7 .

[0038] The lower cylinder module comprises a cyclone cylinder 8 , which is in the shape of a hollow truncated cone. A liquid outlet 9 is arranged at the smaller end surface of the cyclone cylinder 8 .

[0039] Example 4

[0040] like Figure 1 As shown, a double-screw gas-liquid separation device proposed in this embodiment includes an upper cylinder module and a lower cylinder module, wherein the upper cylinder module and the lower cylinder module are arranged vertically and are fixedly connected to each other.

[0041] The upper cylinder module includes a cylinder 7 , and the lower cylinder module includes a cyclone cylinder 8 . The lower end of the cylinder 7 is fixedly connected to the larger end surface of the cyclone cylinder 8 .

[0042] The upper cylinder module includes a cylinder 7 and a gas pipeline 10. The upper end surface of the cylinder 7 is provided with a through hole matching the gas pipeline 10. The gas pipeline 10 is partially inserted into the cylinder 7. The cylinder 7 is fixedly connected to the outer wall of the gas pipeline 10. An outer spiral 5 is provided between the gas pipeline 10 and the cylinder 7. The axis of the outer spiral 5 coincides with the axis of the gas pipeline 10.

[0043] A central axis 2 is provided inside the gas pipeline 10, a gas outlet 1 is provided at the top of the gas pipeline 10, a support rod 11 is horizontally welded to one end of the central axis 2 close to the gas outlet 1, the middle of the support rod 11 is welded to the central axis 2, and both ends of the support rod 11 are welded to the inner wall of the gas pipeline 10, an inner spiral body 6 is provided between the gas pipeline 10 and the central axis 2, and the axis of the inner spiral body 6 coincides with the axis of the central axis 2;

[0044] A tangential inlet 4 is provided on the outer wall of the cylindrical body 7 .

[0045] The lower cylinder module comprises a cyclone cylinder 8 , which is in the shape of a hollow truncated cone. A liquid outlet 9 is arranged at the smaller end surface of the cyclone cylinder 8 .

[0046] The outer spiral body 5 is welded to the outer wall of the gas pipeline 10 and connected to the inner wall of the cylindrical body 7 .

Claims

1. Double-screw gas-liquid separation device, characterized in that: It comprises an upper cylinder module and a lower cylinder module, wherein the upper cylinder module and the lower cylinder module are arranged vertically and are fixedly connected to each other.

2. The double-screw channel gas-liquid separation device according to claim 1, characterized in that: The upper cylinder module comprises a cylindrical body (7), and the lower cylinder module comprises a cyclone cylinder (8). The lower end of the cylindrical body (7) is fixedly connected to the larger end surface of the cyclone cylinder (8).

3. The double-screw channel gas-liquid separation device according to claim 2, characterized in that: The upper cylinder module comprises a cylinder (7) and a gas pipeline (10); the upper end surface of the cylinder (7) is provided with a through hole matching the gas pipeline (10); the gas pipeline (10) is partially inserted into the cylinder (7); the cylinder (7) and the outer wall of the gas pipeline (10) are fixedly connected at the joint; an outer spiral (5) is provided between the gas pipeline (10) and the cylinder (7); the axis of the outer spiral (5) coincides with the axis of the gas pipeline (10); A central axis (2) is provided inside the gas pipeline (10), a gas outlet (1) is provided at the top of the gas pipeline (10), a support rod (11) is horizontally welded to one end of the central axis (2) close to the gas outlet (1), the middle of the support rod (11) is welded to the central axis (2), and both ends of the support rod (11) are welded to the inner wall of the gas pipeline (10), an inner spiral body (6) is provided between the gas pipeline (10) and the central axis (2), and the axis of the inner spiral body (6) coincides with the axis of the central axis (2); The outer wall of the cylindrical body (7) is provided with a tangential inlet (4).

4. The double-screw gas-liquid separation device according to claim 2, characterized in that: The lower cylinder module comprises a cyclone cylinder (8), the cyclone cylinder (8) is in the shape of a hollow truncated cone, and a liquid outlet (9) is provided at the smaller end surface of the cyclone cylinder (8).

5. The double-screw channel gas-liquid separation device according to claim 3, characterized in that: The outer spiral body (5) is welded to the outer wall of the gas pipeline (10) and connected to the inner wall of the cylindrical body (7).

6. The double-screw channel gas-liquid separation device according to claim 3, characterized in that: The inner spiral body (6) is welded to the outer wall of the central axis (2) and connected to the inner wall of the gas pipeline (10).

7. The double-screw channel gas-liquid separation device according to claim 3, characterized in that: A gas baffle (3) is provided at one end of the outer spiral body (5) close to the gas outlet (1), and the gas baffle (3) is horizontally arranged on the inner wall of the cylinder (7), and the diameter of the gas baffle (3) matches the inner diameter of the cylinder (7); The tangential inlet (4) is horizontally arranged below the gas baffle (3), and the tangential inlet (4) is connected to the cylinder (7).

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