Gas-liquid separation device and gas-liquid separation method

Abstract

The invention provides a gas-liquid separation device, which comprises: a tank body, the side wall of the tank body is provided with a gas-liquid inlet and a liquid outlet, and the top of the tank body is provided with a gas outlet; the gas-liquid separation cavity is formed in the tank body, a gas-liquid separation unit is arranged in the gas-liquid separation cavity, and the gas-liquid separation unit comprises a rotational flow plate and a baffle plate assembly located below the rotational flow plate; the gas washing cavity is formed in the tank body and is positioned above the gas-liquid separation cavity; a gas washing unit is arranged in the gas washing cavity; wherein the gas-liquid inlet penetrates through the side wall of the tank body and extends inwards to be communicated with the rotational flow plate, the rotational flow plate is configured to enable to-be-separated gas-liquid fluid from the gas-liquid inlet to rotate and then enter the baffle plate assembly so as to realize gas-liquid separation, separated gas with liquid drops moves upwards, liquid removal is carried out through the gas washing unit, and the gas washing unit is used for washing the gas with the liquid drops. The gas after liquid removal is discharged through the gas outlet, and the separated liquid moves downwards and is discharged through the liquid outlet. The invention also provides a gas-liquid separation method.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas-liquid separation, and particularly relates to a gas-liquid separation device and method, especially a gas-liquid separation device and gas-liquid separation method for the produced fluid in oil and gas fields. Background Art

[0002] Oil-gas separation is one of the main links in the oil-gas treatment process. Gas-liquid separators are widely used in oil and gas fields as the main equipment for oil-gas separation. The gas-liquid mixed fluid enters the separator and undergoes preliminary separation at the inlet. After primary separation, the gas stream carrying smaller liquid droplets flows upward at a lower velocity towards the gas outlet, while the liquid droplets settle downward. The gas flows upward and captures the smaller liquid droplets that could not be separated in the settling section through the demisting section. The tiny liquid droplets collide and coalesce here, and finally combine into larger liquid droplets and descend to the liquid accumulation section. The discharged gas can be used as fuel gas or exported. Before entering the compressor, a gas scrubber etc. is usually set up to reduce the impact of liquid droplets or impurities on the operation of the compressor. This method not only has a long process flow and a large floor area, but also increases the maintenance cost and high operating expenses, resulting in low efficiency of the gas-liquid separation process and high separation cost. Summary of the Invention

[0003] Aiming at the above-mentioned technical problems, the present invention aims to provide a gas-liquid separation device and a gas-liquid separation method. The gas-liquid separation device can complete gas-liquid separation quickly and efficiently. At the same time, the gas-liquid separation method uses this gas-liquid separation device, enabling the gas to achieve rapid and fine filtration through the high-efficiency washing chamber to remove liquid droplets, and can directly enter the compressor, reducing the separate gas washing and filtering process steps and equipment, and ensuring the safe and stable operation of the downstream compressor.

[0004] To this end, according to the first aspect of the present invention, there is provided a gas-liquid separation device, including: a tank body, the side wall of the tank body is provided with a gas-liquid inlet and a liquid outlet, and the top of the tank body is provided with a gas outlet; a gas-liquid separation chamber formed inside the tank body, in which a gas-liquid separation unit is provided, which includes a swirl plate and a baffle assembly located below the swirl plate; a gas washing chamber formed inside the tank body and above the gas-liquid separation chamber, in which a gas washing unit is provided; wherein, the gas-liquid inlet penetrates through the side wall of the tank body and extends inward to communicate with the swirl plate, the swirl plate is configured to enable the gas-liquid fluid to be separated coming from the gas-liquid inlet to rotate and then enter the baffle assembly to achieve gas-liquid separation, the separated gas with liquid droplets moves upward, and is de-liquefied through the gas washing unit, and the de-liquefied gas is discharged through the gas outlet, and the separated liquid moves downward and is discharged through the liquid outlet.

[0005] In one embodiment, the cyclone plate is configured as a conical cylinder with a decreasing diameter from top to bottom and is formed into a tapered helical surface. A fluid channel is formed between the helical surfaces, and a sieve plate with holes is provided at the upper part of the cyclone plate. The gas-liquid fluid to be separated from the gas-liquid inlet rotates through the fluid channel and moves upward through the holes to enter the gas scrubbing unit.

[0006] In one embodiment, the cone angle of the conical cylinder is set to be in the range of 20 - 30 degrees.

[0007] In one embodiment, the upper edge of the cyclone plate is fixedly connected to the inner wall surface of the tank body by welding.

[0008] In one embodiment, the baffle plate assembly includes at least two baffle plates, which are arranged radially opposite and staggered axially.

[0009] In one embodiment, the baffle plate is fixedly connected to the inner wall of the tank body and slopes downward, and the angle between the baffle plate and the horizontal plane is set to be in the range of 20 - 30 degrees.

[0010] In one embodiment, the gas scrubbing unit includes a mist eliminator, a demister, and a filter arranged in sequence from bottom to top. The demister is arranged close to the mist eliminator and is spaced apart from the filter. The filter includes a filter element for liquid and dust removal.

[0011] After the gas enters the mist eliminator, it is separated into single-channel flows. Under the action of inertial force, the liquid droplet mist collides with the bent plate to form a liquid film; the liquid film moves upward with the air flow and is separated at the bent part.

[0012] The gas with liquid droplets passes through the mist eliminator, the demister, and the filter in sequence for multi-stage liquid removal, thereby realizing gas separation.

[0013] In one embodiment, the mist eliminator is formed by arranging a plurality of bent plates. Each bent plate extends in a continuously bent form, and a baffle perpendicular to the air flow direction is provided at the bent part of the bent plate.

[0014] In one embodiment, the demister uses a wire mesh demister made by weaving metal wires. When the liquid droplets carried by the gas pass through the wire mesh demister, the liquid droplets condense and drip at the intersections of the metal wires.

[0015] According to the second aspect of the present invention, a gas-liquid separation method is provided, including the following steps:

[0016] Provide the gas-liquid separation device as described above;

[0017] The gas-liquid fluid to be separated is introduced into the cyclone plate through the gas-liquid inlet. After the gas-liquid fluid rotates through the cyclone plate, it enters the baffle plate to achieve primary gas-liquid separation.

[0018] The separated gas carrying liquid droplets moves upward and is de-liquefied through the gas scrubbing unit to achieve secondary gas-liquid separation. The gas after secondary separation is discharged through the gas outlet.

[0019] The liquid obtained after primary separation and secondary separation moves downward and is discharged through the liquid outlet, thus completing gas-liquid separation.

[0020] Compared with the prior art, the advantages of the present application are as follows:

[0021] The gas-liquid separation device according to the present invention can achieve multi-stage gas-liquid separation through the gas-liquid separation unit and the gas scrubbing unit, and can effectively improve the gas-liquid separation effect. The gas-liquid separation device utilizes the cyclone plate and the baffle plate assembly. Through swirling and baffling, the liquid state tends to be stable, and the gas-liquid phase separation can be completed quickly and efficiently. At the same time, the gas passes through the high-efficiency gas scrubbing chamber, which can achieve rapid and fine filtration, remove liquid droplets, and can directly enter the compressor connected to the gas outlet, thereby reducing the gas single washing and filtering process links and equipment, ensuring the safe and stable operation of the downstream compressor, which is very beneficial to improving the gas-liquid filtration efficiency, enhancing the gas-liquid separation effect, and significantly reducing the gas-liquid separation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described below with reference to the accompanying drawings.

[0023] Figure 1 Schematically shows the structure of the gas-liquid separation device according to the present invention;

[0024] Figure 2 Schematically shows the structural schematic diagram of the sieve plate and the cyclone plate of the gas-liquid separation device according to the present invention;

[0025] Figure 3 Schematically shows the top view schematic diagram of the sieve plate of the gas-liquid separation device according to the present invention;

[0026] Figure 4 Schematically shows the top view schematic diagram of the cyclone plate of the gas-liquid separation device according to the present invention;

[0027] Figure 5 Schematically shows the structural schematic diagram of the mist eliminator of the gas-liquid separation device according to the present invention.

[0028] In the present application, all the drawings are schematic drawings, only used to illustrate the principle of the present invention, and are not drawn according to the actual ratio. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be introduced below with reference to the accompanying drawings.

[0030] In this application, it should be noted that the directional terms or qualifiers such as "upper", "lower", etc. used in this application are all with reference to the accompanying drawings Figure 1 merely 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 operate in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0031] Figure 1 Schematically shows the structure of the gas-liquid separation device 100 according to the present invention. As Figure 1 shown, the gas-liquid separation device 100 includes a tank body 10. The side wall of the tank body 10 is provided with a gas-liquid inlet 11 and a liquid outlet 12, and the top of the tank body 10 is provided with a gas outlet 13. A gas-liquid separation chamber 101 is formed inside the tank body 10. A gas-liquid separation unit 2 is provided in the gas-liquid separation chamber 101. The gas-liquid separation unit 2 includes a swirl plate 21 and a baffle plate assembly 22 located below the swirl plate 21. A gas washing chamber 102 is also formed inside the tank body 10. The gas washing chamber 102 is located above the gas-liquid separation chamber 101, and a gas washing unit 3 is provided inside the gas washing chamber 102. The gas-liquid inlet 11 penetrates the side wall of the tank body 10 and extends inward to communicate with the swirl plate 21. The swirl plate 21 is configured to enable the gas-liquid fluid to be separated coming from the gas-liquid inlet 11 to rotate and then enter the baffle plate assembly 22 to achieve gas-liquid separation. The separated gas carrying liquid droplets moves upward and is de-liquefied by the gas washing unit 3. The de-liquefied gas is discharged through the gas outlet 13, and the separated liquid moves downward and is discharged through the liquid outlet 12.

[0032] The gas outlet 13 can be directly connected to a compressor (not shown), for example. Thus, the gas is efficiently washed through the gas washing chamber 102, quickly and finely filtered, and after removing the liquid droplets, it can directly enter the compressor, reducing the separate gas washing and filtering process steps and equipment, and ensuring the safe and stable operation of the downstream compressor.

[0033] In one embodiment, as Figure 1 shown, the tank body 10 can be configured as a cylindrical shape and sealed at both the top and bottom. The gas-liquid inlet 11 and the liquid outlet 12 are radially opposite to each other, and the gas-liquid inlet 11 is close to the axial middle position of the tank body 10. The liquid outlet is set lower than the gas-liquid inlet 11 and is located near the bottom of the tank body 10. The gas-liquid inlet 11 is provided at the center position of the top of the pipe body 10. In addition, the bottom of the tank body 10 is configured as a spherical surface, and a solid outlet 14 is provided at the center position of the bottom of the tank body 10. The solids deposited at the bottom of the tank body 10 can be discharged through the solid outlet 14.

[0034] According to the present invention, as Figure 1 shown, the cyclone plate 21 is configured as a conical cylinder with a diameter decreasing from top to bottom and is formed as a tapered spiral surface. A fluid passage is formed between the spiral surfaces, and the gas-liquid fluid to be separated from the gas-liquid inlet 11 rotates through the fluid passage. As Figures 2 to 4 shown, the top surface of the cyclone plate 21 is provided with a sieve plate 211 with holes. The gas forms a swirl through the spirally extending conical cylinder and can move upward through the holes of the sieve plate 211 to enter the gas scrubbing unit 3. The angle of the cone angle forming the conical cylinder of the cyclone plate 21 is set to be within the range of 20-30 degrees, so as to improve the swirl efficiency, quickly make the liquid tend to be stable, and efficiently complete the gas-liquid separation. This structure of the cyclone plate 21 can particularly effectively enhance the rotation effect of the fluid, which is beneficial to enhancing the gas-liquid separation effect of the gas-liquid separation device 100 and improving the gas-liquid separation efficiency.

[0035] In one embodiment, the upper end edge of the cyclone plate 21 is fixedly connected to the inner wall surface of the tank body 10 by welding. The gas-liquid inlet 11 penetrates the side wall of the tank body 10 and extends inward to communicate with the fluid passage of the cyclone plate 21. Thus, the gas-liquid fluid to be separated from the gas-liquid inlet 11 can directly enter the fluid passage of the cyclone plate 21.

[0036] According to the present invention, the baffle plate assembly 22 includes at least two baffle plates, which are arranged radially opposite and are staggeredly distributed axially.

[0037] In Figure 1 the shown embodiment, the baffle plate assembly 22 includes two baffle plates, and the two baffle plates are arranged radially opposite and are staggeredly distributed axially.

[0038] In one embodiment, one end of the baffle plate is fixedly connected to the inner wall of the tank body 10. At the same time, the baffle plate is inclined downward, and the angle between the baffle plate and the horizontal plane is set to be within the range of 20-30 degrees, so as to improve the baffle efficiency, quickly make the liquid tend to be stable, and efficiently complete the gas-liquid separation.

[0039] Preferably, the lower end of the baffle plate extends towards the center to exceed the central axis of the tank body 10.

[0040] According to the present invention, as Figure 1 shown, the gas scrubbing unit 3 includes a mist eliminator 31, a demister 32, and a filter 33 arranged in sequence from bottom to top. The demister 32 is arranged close to the mist eliminator 31. Preferably, the lower end surface of the demister 32 sits on the upper end of the mist eliminator 31 and the two are in contact. At the same time, the filter 33 is arranged at an interval above the demister 32.

[0041] In one embodiment, the mist eliminator 31 can be a TP plate type mist eliminator, which can capture small droplets in the gas by using the collision force and centrifugal force. When the gas carrying droplets passes through the mist eliminator 31, the gas flows along the flow channel in the mist eliminator 31. Due to the large density, the droplets are affected by gravity and cannot completely flow with the gas, and continuously collide with the TP plates and coagulate.

[0042] In one embodiment, as Figure 5 shown, the mist eliminator 31 is formed by arranging a plurality of bent plates 311. Each bent plate 311 extends in a continuous bending form, and a baffle 3111 perpendicular to the gas flow direction is provided at the bending position of the bent plate 311, so as to enhance the collision of the gas flow with the baffle 3111 and the bent plate 311, enabling the droplets to accumulate on the baffle 3111 and the bent plate 311, thus facilitating gas-liquid separation.

[0043] In one embodiment, the wire mesh demister 32 is mainly made of metal filaments. When the gas carrying droplets passes through, the droplets condense and drip at the intersections of the filaments.

[0044] The filter 33 includes a filter element (not shown), which is used for liquid and dust removal and has extremely high liquid and dust removal capabilities. The gas carrying droplets passes through the mist eliminator 31, the demister 32 and the filter 33 in sequence for multi-stage liquid removal, thereby realizing the separation of the gas.

[0045] According to the present invention, a gas-liquid separation method using the gas-liquid separation device 100 as described above for gas-liquid separation is also provided. The gas-liquid separation method will be introduced in detail below.

[0046] First, assemble the gas-liquid separation device 100.

[0047] Pass the gas-liquid fluid to be separated through the gas-liquid inlet 11 into the swirl plate 21. The gas-liquid fluid enters the fluid channel on the swirl plate 21 and enters the baffle plate 22 after rotation to achieve primary gas-liquid separation.

[0048] The separated gas carrying droplets moves upward and is de-liquefied through the gas washing unit 3 to achieve secondary gas-liquid separation. The gas after secondary separation is discharged through the gas outlet 13.

[0049] Specifically, the gas carrying droplets enters the TP plate type mist eliminator 31, wire mesh mist eliminator 32, and fine filter 33 in sequence. The TP plate type mist eliminator 31 mainly captures small droplets by collision force and centrifugal force. When the gas carrying droplets passes through the wire mesh mist eliminator 32, the gas flows along the internal flow channel of the wire mesh mist eliminator 32. Due to the large density of the droplets, affected by gravity, they cannot completely flow with the gas and continuously collide with the TP plate, resulting in condensation. When the gas carrying droplets passes through the metal filaments of the wire mesh mist eliminator 32, the droplets condense and drip at the intersections of the metal filaments. The gas then passes through the filter element of the fine filter 33 to achieve efficient liquid and dust removal. Thus, secondary gas-liquid separation is achieved. The finally separated gas is discharged through the gas outlet 13.

[0050] The liquid obtained through primary separation and secondary separation moves downward and is discharged through the liquid outlet 12, thus completing gas-liquid separation. In addition, the solids deposited at the bottom of the tank body 10 are discharged through the solid outlet 14.

[0051] The gas-liquid separation device 100 and the gas-liquid separation method according to the present invention are particularly suitable for gas-liquid separation of produced fluids in oil and gas fields.

[0052] The gas-liquid separation device 100 according to the present invention can achieve multi-stage gas-liquid separation through the gas-liquid separation unit 2 and the gas scrubbing unit 3, and can effectively improve the gas-liquid separation effect. The gas-liquid separation device 100 utilizes the swirl plate 21 and the baffle plate assembly 22, and through swirling and baffling, makes the liquid state tend to be stable, and can quickly and efficiently complete gas-liquid phase separation. At the same time, the gas passes through the high-efficiency gas scrubbing chamber 102, can achieve rapid and fine filtration, remove droplets, and can directly enter the compressor connected to the gas outlet 13, thereby reducing the separate gas scrubbing and filtration process steps and equipment, ensuring the safe and stable operation of the downstream compressor, which is very beneficial to improving the gas-liquid filtration efficiency, enhancing the gas-liquid separation effect, and significantly reducing the gas-liquid separation cost.

[0053] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0054] In addition, in the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection 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.

[0055] Finally, it should be noted that the above are only the preferred implementation schemes of the present invention and do not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the foregoing implementation schemes, for those skilled in the art, it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gas-liquid separation device, comprising: A tank body (10), on the side wall of the tank body (10) there are provided a gas-liquid inlet (11) and a liquid outlet (12), and at the top of the tank body (10) there is provided a gas outlet (13); A gas-liquid separation chamber (101) formed inside the tank body (10), inside the gas-liquid separation chamber (101) there is provided a gas-liquid separation unit (2), which includes a swirl plate (21) and a baffle plate assembly (22) located below the swirl plate (21); A gas scrubbing chamber (102) formed inside the tank body (10) and located above the gas-liquid separation chamber (101), inside the gas scrubbing chamber (102) there is provided a gas scrubbing unit (3); Wherein, the gas-liquid inlet (11) penetrates through the side wall of the tank body (10) and extends inward to communicate with the swirl plate (21), the swirl plate (21) is configured to enable the gas-liquid fluid to be separated from the gas-liquid inlet (11) to rotate and then enter the baffle plate assembly (22) to achieve gas-liquid separation, the separated gas with liquid droplets moves upward and is de-liquefied by the gas scrubbing unit (3), and the de-liquefied gas is discharged through the gas outlet (13), and the separated liquid moves downward and is discharged through the liquid outlet (12).

2. The gas-liquid separation device according to claim 1, wherein The swirl plate (21) is configured as a conical cylinder with a diameter decreasing from top to bottom and forms a tapered spiral surface, a fluid channel is formed between the spiral surfaces, and a sieve plate (211) with holes is provided at the top of the swirl plate (21), the gas-liquid fluid to be separated from the gas-liquid inlet (11) rotates through the fluid channel and moves upward through the holes to enter the gas scrubbing unit (3).

3. The gas-liquid separation device according to claim 2, characterized in that, The cone angle of the conical cylinder is set to be within the range of 20 - 30 degrees.

4. The gas-liquid separation device according to claim 2 or 3, characterized in that, The upper end edge of the swirl plate (21) is fixedly connected to the inner wall surface of the tank body (10) by welding.

5. The gas-liquid separation device according to claim 2 or 3, characterized in that, The baffle plate assembly (22) includes at least two baffle plates, the baffle plates are arranged radially opposite and are staggered in the axial direction.

6. The gas-liquid separation device according to claim 5, characterized in that, The baffle plates are fixedly connected to the inner wall of the tank body (10) and are inclined downward, and the angle between the baffle plates and the horizontal plane is set to be within the range of 20 - 30 degrees.

7. The gas-liquid separation device according to claim 1, characterized in that, The gas scrubbing unit (3) includes a mist eliminator (31), a demister (32) and a filter (33) arranged in sequence from bottom to top, the demister (32) is arranged close to the mist eliminator (31) and is spaced apart from the filter (33), the filter (33) includes a filter element for de-liquefying and removing dust, and the gas with liquid droplets passes through the mist eliminator (31), the demister (32) and the filter (33) in sequence for multi-stage de-liquefaction, thereby achieving gas separation.

8. The gas-liquid separation device according to claim 7, wherein The mist eliminator (31) is formed by arranging a plurality of bent plates (311), each of the bent plates (311) extends in a continuously bent form, and a baffle (3111) perpendicular to the gas flow direction is provided at the bent part of the bent plate (311).

9. The gas-liquid separation device according to claim 7 or 8, characterized in that, The demister (32) is a wire mesh demister made of woven metal wires. When the droplets carried by the gas pass through the wire mesh demister, the droplets condense and drip at the intersections of the metal wires.

10. A gas-liquid separation method, comprising the following steps: Providing the gas-liquid separation device (100) according to any one of claims 1 to 9; Introducing the gas-liquid fluid to be separated into the swirl plate (21) through the gas-liquid inlet (11). After the gas-liquid fluid rotates through the swirl plate (21), it enters the baffle plate (22) to achieve primary gas-liquid separation; The gas carrying droplets separated moves upward and is de-liquefied by the gas scrubbing unit (3) to achieve secondary gas-liquid separation. The gas after secondary separation is discharged through the gas outlet (13); The liquid obtained after primary separation and secondary separation moves downward and is discharged through the liquid outlet (12), thereby completing gas-liquid separation.

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