Self-adaptive axial-flow type gas-liquid cyclone separator with slug flow

Abstract

The utility model relates to the technical field of cyclone separators, in particular to a slug flow self-adaptive axial flow type gas-liquid cyclone separator which comprises a reducing outer cylinder, a vertical inner cylinder, a guide impeller, a horizontal inlet pipe and a side line guide pipe. One end of the vertical inner cylinder is connected with the bottom of the variable-diameter outer cylinder, and the other end of the vertical inner cylinder is connected with the horizontal inlet pipe through a right-angle bent pipe; one end of the lateral line conduit is connected with the horizontal inlet pipe, and the other end of the lateral line conduit is connected with the variable-diameter outer cylinder; and a flow guide impeller is arranged in the vertical inner cylinder. According to the utility model, gas with pressure is transferred into the variable-diameter outer cylinder by adopting the side line guide pipe, so that the pressure in the cylinder body is increased to a certain extent, the pressure difference between the cylinder body and the horizontal inlet pipe is reduced, slug flow is prevented from being formed from an inlet, and gas and liquid can enter the separator in a small-slug flow or mixed flow state. The slug flow can be weakened or even eliminated without external intervention, so that the separation performance of the axial flow type gas-liquid separator under a complex flow pattern is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cyclone separators, in particular to an axial flow gas-liquid cyclone separator with slug flow self-adaptation. Background Art

[0002] Gas-liquid separation technology is widely used in the fields of petrochemical industry, energy utilization, nuclear energy development, etc. Downhole gas-liquid separation is extremely important for oil production and extending the economic life of high-liquid wells.

[0003] In actual application, the gas-liquid mixture to be separated underground has the characteristics of large gas-liquid flow rate variation and diverse flow patterns. The existing axial flow gas-liquid separator is only suitable for low gas-liquid processing volume and stable flow conditions. When the processing volume increases, or encounters unstable flow such as slug flow, overflow or even flow interruption will occur in the separator, seriously affecting the separation efficiency.

[0004] Therefore, an axial flow gas-liquid cyclone separator with slug flow self-adaptation is provided, which can weaken or even eliminate the slug flow without external intervention, thereby improving the separation performance of the axial flow gas-liquid separator under complex flow patterns. Utility Model Content

[0005] In order to overcome the problems existing in the prior art, the utility model aims to provide an axial flow gas-liquid cyclone separator with slug flow self-adaptation.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an axial flow gas-liquid cyclone separator with segment flow self-adaptation, comprising a variable diameter outer cylinder, a vertical inner cylinder, a guide vane, a horizontal inlet pipe and a side line duct; one end of the vertical inner cylinder is connected to the bottom of the variable diameter outer cylinder, and the other end of the vertical inner cylinder is connected to the horizontal inlet pipe through a right-angle elbow; one end of the side line duct is connected to the horizontal inlet pipe, and the other end of the side line duct is connected to the variable diameter outer cylinder; the guide vane is arranged inside the vertical inner cylinder.

[0007] The utility model is further configured as follows: the variable diameter outer cylinder is a variable diameter cylinder with an enlarged middle portion and narrowed ends; the variable diameter outer cylinder comprises a gas overflow section, a variable diameter section and a liquid reflux section from top to bottom.

[0008] The utility model is further configured as follows: the variable diameter section occupies one third of the total length of the variable diameter outer cylinder.

[0009] The utility model is further configured as follows: the side line conduit is connected to the variable diameter section of the variable diameter outer cylinder.

[0010] The side line duct transfers the pressurized gas into the cylinder, which can increase the pressure inside the variable diameter outer cylinder to a certain extent, reduce the pressure difference between the variable diameter outer cylinder and the horizontal inlet pipe, hinder the formation of slug flow, and allow gas and liquid to enter the separator in the form of small slug flow or mixed flow.

[0011] The utility model is further configured as follows: the axial flow gas-liquid cyclone separator also includes a liquid outlet pipe and a gas outlet pipe, the gas outlet pipe is connected to the gas overflow section, and the liquid outlet pipe is arranged at the side wall of the liquid reflux section.

[0012] The gas with low density is subject to small centrifugal force. After forming a gas column in the center of the variable diameter outer cylinder, it continues to move upward and is discharged through the gas outlet pipe at the top. The liquid has high density and is subject to large centrifugal force. It is thrown to the outer wall of the cylinder, moves downward under the action of gravity, and flows out from the liquid outlet pipe.

[0013] The utility model is further configured as follows: one end of the vertical inner cylinder extends into the interior of the variable diameter outer cylinder, and the outlet of the vertical inner cylinder is flush with the bottom of the variable diameter section.

[0014] The utility model is further configured as follows: the guide impeller is installed in the vertical inner cylinder at one end close to the variable diameter outer cylinder.

[0015] The utility model is further configured as follows: the position of the guide impeller is flush with the position of the liquid outlet pipe on the side wall of the liquid reflux section.

[0016] The liquid between the vertical inner cylinder and the variable diameter outer cylinder will also have a certain degree of rotational flow, which is helpful to further separate the entrained bubbles. There is a certain height difference between the liquid outlet pipe and the bottom of the outer cylinder, which can maintain a certain liquid level in the separator, thereby maintaining the rotational flow of the liquid, ensuring that the liquid that settles after separation has enough space to fully develop before flowing out of the variable diameter outer cylinder of the separator, thereby reducing the entrainment of bubbles by the outflowing liquid.

[0017] The utility model is further configured as follows: a one-way valve is arranged on the side line conduit so that only fluid is allowed to flow from bottom to top in the side line conduit.

[0018] In summary, the beneficial effects of the above technical solution of the utility model are as follows:

[0019] 1. The utility model uses a side line conduit to transfer the pressurized gas into the cylinder, which can increase the pressure in the cylinder to a certain extent, reduce the pressure difference between the cylinder and the horizontal inlet pipe, hinder the formation of slug flow from the inlet, and allow the gas and liquid to enter the separator in the form of small slug flow or mixed flow. The slug flow can be weakened or even eliminated without external intervention, thereby improving the separation performance of the axial flow gas-liquid separator under complex flow patterns.

[0020] 2. By enlarging the middle diameter of the variable diameter outer cylinder, the space for gas expansion is increased, the pressure fluctuation in the separator is reduced, and the liquid level in the separator is easily controlled within a certain range, the flow field can be stabilized, and the separation efficiency of the separator is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1-gas outlet pipe, 2-variable outer cylinder, 21-gas overflow section, 22-variable section, 23-liquid reflux section, 3-guide impeller, 4-liquid outlet pipe, 5-side line conduit, 6-check valve, 7-horizontal inlet pipe, 8-vertical inner cylinder. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following is a clear and complete description of the technical solution of the present invention in conjunction with the drawings of the present invention. Based on the embodiments of the present invention, other similar embodiments obtained by ordinary technicians in the field without creative work should all fall within the scope of protection of the present invention. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the creation of the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0028] Example:

[0029] like Figure 1As shown, it is a preferred embodiment of the utility model, an axial flow gas-liquid cyclone separator with segment flow self-adaptation, comprising a variable diameter outer cylinder 2, a vertical inner cylinder 8, a guide vane 3, a horizontal inlet pipe 7 and a side line duct 5; one end of the vertical inner cylinder 8 is connected to the bottom of the variable diameter outer cylinder 2, and the other end of the vertical inner cylinder 8 is connected to the horizontal inlet pipe 7 through a right-angle bend; one end of the side line duct 5 is connected to the horizontal inlet pipe 7, and the other end of the side line duct 5 is connected to the variable diameter outer cylinder 2; the guide vane 3 is arranged inside the vertical inner cylinder 8.

[0030] The variable diameter outer cylinder 2 is a variable diameter cylinder with an enlarged middle part and narrowed ends; the variable diameter outer cylinder 2 is composed of a gas overflow section 21, a variable diameter section 22 and a liquid reflux section 23 from top to bottom. The variable diameter section 22 accounts for one third of the total length of the variable diameter outer cylinder 2.

[0031] The side line conduit 5 is connected to the variable diameter section 22 of the variable diameter outer tube 2. A one-way valve 6 is provided on the side line conduit 5, and only the fluid is allowed to flow from bottom to top in the side line conduit 5.

[0032] One end of the vertical inner cylinder 8 extends into the interior of the variable diameter outer cylinder 2, and the outlet of the vertical inner cylinder 8 is flush with the bottom of the variable diameter section 22. The vertical inner cylinder 8 and the variable diameter outer cylinder 2 can be installed by conventional means such as welding or threading.

[0033] The axial flow gas-liquid cyclone separator further comprises a liquid outlet pipe 4 and a gas outlet pipe 1 . The gas outlet pipe 1 is connected to the gas overflow section 21 . The liquid outlet pipe 4 is arranged at the side wall of the liquid reflux section 23 .

[0034] The guide impeller 3 is installed in the vertical inner cylinder 8 at one end close to the variable diameter outer cylinder 2 , and the guide impeller 3 is flush with the liquid outlet pipe 4 .

[0035] The gas-liquid mixture enters from the horizontal inlet pipe 7, flows in the horizontal inlet pipe 7 in the form of stratified flow, flows to the right-angle elbow, and a part of the gas is compressed by the right-angle elbow and enters the inside of the variable diameter outer tube 2 through the side line conduit 5.

[0036] The gas-liquid mixture entering the vertical inner cylinder 8 is accelerated by the guide impeller 3 and enters the variable diameter outer cylinder. The gas with low density is subjected to small centrifugal force, and after forming a gas column in the center of the variable diameter outer cylinder 2, it continues to move upward and is discharged through the gas outlet pipe 1 at the top; while the liquid has high density and is subjected to large centrifugal force, and is thrown to the outer wall surface in the variable diameter outer cylinder 2, moves downward under the action of gravity, and flows out from the liquid outlet pipe 4, thereby completing the gas-liquid separation process.

[0037] Due to the axial entry, a slug flow will be formed in the vertical inner cylinder 8. The utility model partially enlarges the diameter of the variable diameter outer cylinder 2. The enlarged space can buffer the pressure change caused by the slug flow in the variable diameter outer cylinder 2 and reduce the fluctuation range of the liquid level in the variable diameter outer cylinder 2.

[0038] In addition, the prerequisite for the formation of slug flow is that the incoming flow from the horizontal inlet pipe 7 presents a stratified flow. The side line conduit 5 connects the horizontal inlet pipe 7 and the variable diameter outer cylinder 2. When the slug flow begins to form, the gas in the horizontal inlet pipe 7 is compressed, and the compressed gas is transferred to the variable diameter outer cylinder 2 through the side line conduit 5, reducing the pressure at the bottom of the vertical inner cylinder 8, balancing the pressure difference between the upper and lower parts of the variable diameter outer cylinder 2, and hindering the formation of slug flow. By transferring the pressurized gas, not only the pressure difference between the inside and the inlet of the separator is balanced, but also the slug flow can be reduced to a small slug flow or a mixed flow, reducing the pressure fluctuation in the separator cylinder, and effectively controlling the liquid level in the cylinder, improving the separation performance of the axial flow gas-liquid separator.

[0039] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. An axial flow gas-liquid cyclone separator with slug flow adaptation, characterized in that: It includes a variable diameter outer cylinder, a vertical inner cylinder, a guide vane, a horizontal inlet pipe and a side line duct; one end of the vertical inner cylinder is connected to the bottom of the variable diameter outer cylinder, and the other end of the vertical inner cylinder is connected to the horizontal inlet pipe through a right-angle elbow; one end of the side line duct is connected to the horizontal inlet pipe, and the other end of the side line duct is connected to the variable diameter outer cylinder; the guide vane is arranged inside the vertical inner cylinder.

2. The axial flow gas-liquid cyclone separator with slug flow adaptation according to claim 1, characterized in that: The variable diameter outer cylinder is a variable diameter cylinder with an enlarged middle portion and narrowed ends; the variable diameter outer cylinder comprises a gas overflow section, a variable diameter section and a liquid reflux section from top to bottom.

3. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 2, characterized in that: The variable diameter section accounts for one third of the total length of the variable diameter outer cylinder.

4. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 2, characterized in that: The side line conduit is connected to the reducing section of the reducing outer cylinder.

5. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 2, characterized in that: The axial flow gas-liquid cyclone separator also includes a liquid outlet pipe and a gas outlet pipe. The gas outlet pipe is connected to the gas overflow section. The liquid outlet pipe is arranged at the side wall of the liquid reflux section.

6. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 2, characterized in that: One end of the vertical inner cylinder extends into the interior of the variable diameter outer cylinder, and the outlet of the vertical inner cylinder is flush with the bottom of the variable diameter section.

7. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 5, characterized in that: The guide impeller is installed in the vertical inner cylinder at one end close to the liquid reflux section.

8. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 7, characterized in that: The guide impeller is located flush with the liquid outlet pipe at the side wall of the liquid reflux section.

9. The axial flow gas-liquid cyclone separator with slug flow self-adaptation according to claim 1, characterized in that: A one-way valve is arranged on the side line catheter.

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