CN111420472A - Gas-liquid separation device based on cyclone separation technology - Google Patents
Gas-liquid separation device based on cyclone separation technology Download PDFInfo
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- CN111420472A CN111420472A CN202010402608.2A CN202010402608A CN111420472A CN 111420472 A CN111420472 A CN 111420472A CN 202010402608 A CN202010402608 A CN 202010402608A CN 111420472 A CN111420472 A CN 111420472A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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Abstract
The invention discloses a gas-liquid separation device based on a cyclone separation technology, which comprises: the separation tube, the conical drain tube, the liquid collecting cover and the liquid descending ring; the conical drain pipe is arranged at the upper part of the separation pipe and is coaxially communicated with the separation pipe, the liquid descending ring is coaxially arranged at the upper part of the outer wall of the separation pipe, and the liquid collecting cover is arranged at the upper part of the conical drain pipe and is connected with the liquid descending ring; the lower end of the separation pipe is provided with a gas-liquid two-phase inlet, and a rotation starting mechanism is arranged in the separation pipe so that a gas-liquid two-phase flow rises in a spiral flowing state; the top pipe of the conical drainage pipe is provided with a primary gas phase outlet, the conical drainage pipe is in a cone frustum shape, and a plurality of spirally-rising side seams are arranged along the peripheral side of the inner wall of the conical drainage pipe to form a liquid drainage side seam; the top end of the liquid collection cover is provided with a secondary gas phase outlet. The invention effectively overcomes the adverse effect of rotational flow attenuation on gas-liquid two-phase separation, ensures high-efficiency separation efficiency, and ensures that higher gas-liquid separation efficiency is realized under the condition of smaller pressure loss.
Description
Technical Field
The invention belongs to the technical field of gas-liquid separation, and particularly relates to a gas-liquid separation device based on a cyclone separation technology.
Background
The gas-liquid two-phase flow widely exists in the industrial fields of petroleum, chemical industry, nuclear energy, environmental protection and the like, and is very important for the development of industrial production. Because of the need of production technology, the gas phase and the liquid phase in the gas-liquid two-phase flow are often required to be separated, and the cyclone separation technology is taken as an efficient separation technology and is often applied to the technical field of gas-liquid separation. The cyclone separation technology is based on the centrifugal sedimentation and density difference principle, when multiphase flow flows through a spiral starting device, the multiphase flow rotates at a high speed in the spiral starting device to generate a centrifugal field, and the separation effect is achieved according to the density difference between objects and the action of centrifugal force.
At present, the difficulty of the gas-liquid cyclone separation technology lies in how to timely and effectively remove the separated liquid phase, and the longer the residence time of the liquid phase on the wall surface is, the more the separation efficiency is not improved. In addition, in the gas-liquid cyclone separation process, due to resistance and energy dissipation, the cyclone strength can be rapidly attenuated along the flow direction, at the moment, the liquid phase loses enough centrifugal force, the stable spiral advancing state cannot be kept on the wall surface, meanwhile, the gas-liquid interface is unstable, the liquid film is easy to break, the phenomenon of secondary entrainment of liquid drops occurs, and the gas-liquid separation efficiency is deteriorated. Therefore, it is required to develop a gas-liquid separation apparatus based on a cyclone separation technique, which is excellent in gas-liquid separation performance.
Disclosure of Invention
In order to solve the technical problems, the invention provides a gas-liquid separation device based on a cyclone separation technology, which can maintain the cyclone strength of gas-liquid two phases in the gas-liquid separation process, keep a gas-liquid two-phase interface in a relatively stable state, reduce the breakage of a liquid film on a wall surface, reduce secondary entrainment to the maximum extent and improve the gas-liquid separation efficiency.
In order to solve the problems, the technical scheme of the invention is as follows:
a gas-liquid separation device based on a cyclone separation technology comprises: the separation tube, the conical drain tube, the liquid collecting cover and the liquid descending ring;
the conical drain pipe is arranged at the upper part of the separation pipe and is coaxially communicated with the separation pipe, the liquid descending ring is coaxially arranged at the upper part of the outer wall of the separation pipe, and the liquid collecting cover is arranged at the upper part of the conical drain pipe and is connected with the liquid descending ring;
the lower end of the separation pipe is provided with a gas-liquid two-phase inlet, and a rotation starting mechanism is arranged in the separation pipe so that gas-liquid two-phase flow rises in a spiral flowing state;
the top pipe of the conical drainage pipe is provided with a primary gas phase outlet, the conical drainage pipe is in a cone frustum shape, and a plurality of spirally-rising side seams are arranged along the periphery of the inner wall of the conical drainage pipe to form a liquid drainage side seam;
and a secondary gas phase outlet is formed in the top end of the liquid collection cover.
Preferably, the taper of the tapered drain pipe is 5-10 degrees, so that adverse effects of the attenuation of the swirling strength in the axial direction on the gas-liquid separation process are reduced.
Preferably, the device also comprises a liquid blocking ring, wherein the liquid blocking ring is arranged on the upper end surface of the conical drain pipe, so that the liquid film at the conical drain pipe can be effectively prevented from escaping from the primary gas phase outlet.
Preferably, the longitudinal section of the secondary gas phase outlet is in an inverted cone shape, and the diameter of the lower end of the secondary gas phase outlet is consistent with that of the primary gas phase outlet, so that the large pressure loss is avoided in the process of trapping liquid drops escaping from the primary gas phase outlet, and the operation energy consumption can be reduced.
Preferably, the spiral starting mechanism comprises a flow guide shaft and a plurality of spiral blades, the spiral blades are fixedly mounted on the flow guide shaft and fixedly connected with the inner wall of the separation pipe, the gas-liquid two-phase flow is changed into a spiral flow state from an axial flow state, based on the density difference of the gas phase and the liquid phase, the gas phase and the liquid phase are subjected to different centrifugal forces respectively under the spiral flow state, and the liquid phase is thrown to the wall surface of the separation pipe at once to form a liquid film.
Preferably, the spiral direction of the spiral blade is consistent with the spiral direction of the liquid discharge side seam, so that the secondary entrainment caused by the inertia of the liquid phase and the shearing action of the gas relative to the liquid phase during liquid discharge is reduced, the separation efficiency is reduced, and the spiral direction can be clockwise or anticlockwise.
Preferably, 6 spirally-rising liquid drainage side seams are uniformly arranged on the periphery of the inner wall of the conical drain pipe, the included angle between the side surface of each liquid drainage side seam and the central line is 60 degrees, if the number of the liquid drainage side seams is small, a liquid film cannot be timely drained, and if the number of the liquid drainage side seams is too large, the flow field divergence is caused.
Optionally, the liquid descending ring is provided with a plurality of liquid descending holes, so that separated liquid phase can be effectively discharged in time.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
in the process of gas-liquid separation, because of resistance and energy dissipation, the rotational flow strength can be quickly attenuated along the flow direction, the drain pipe is designed into a cone frustum shape with a certain taper, according to the volume flow conservation principle, when gas-liquid two-phase flow with a certain volume flow flows through the tapered drain pipe, the flow velocity of the gas-liquid two-phase flow is accelerated because the flow cross section area of the tapered drain pipe in the flow direction is reduced, the rotational flow strength of the downstream gas-liquid two-phase flow can be continuously maintained to a certain extent, a gas-liquid two-phase interface is kept in a stable state, the wall surface liquid film is reduced, secondary entrainment is reduced to the maximum extent, the migration distance of liquid drops in the gas-liquid two-phase flow to the wall surface is reduced, and the liquid drops are quickly captured. The adverse effect of the downstream rotational flow attenuation on gas-liquid two-phase separation is effectively overcome, the high-efficiency separation efficiency is ensured, and the high gas-liquid separation efficiency is ensured under the condition of small pressure loss.
Meanwhile, the inner wall of the conical drain pipe is provided with the plurality of liquid drainage side seams, liquid films separated on the wall surface can be effectively removed in time through the liquid drainage side seams, the working condition adaptability is strong, and high gas-liquid separation efficiency can be realized under the working condition of large gas-liquid ratio or small gas-liquid ratio.
Drawings
FIG. 1 is a schematic view of a gas-liquid separation apparatus based on a cyclone separation technique according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of a gas-liquid separation apparatus based on a cyclone separation technique according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a liquid descending ring;
FIG. 4 is a top view of a conical trap.
Description of reference numerals: 1-a separation tube; 2-a rotation starting mechanism; 201-a guide shaft; 202-helical blades; 3-liquid descending ring; 4-a conical drain pipe; 5-liquid collecting cover; 6-liquid drainage side seam; 7-liquid blocking ring; 8-a gas-liquid two-phase inlet; 9-first-stage gas phase outlet; 10-a secondary gas phase outlet; 11-the downcomer wells.
Detailed Description
The present invention provides a gas-liquid separation device based on cyclone separation technology, which is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Referring to fig. 1 and 2, in one embodiment, a gas-liquid separation apparatus based on a cyclone separation technology includes: the device comprises a separation pipe 1, a conical drain pipe 4, a liquid collecting cover 5 and a liquid descending ring 3;
the conical drain pipe 4 is arranged at the upper part of the separation pipe 1 and is coaxially communicated with the separation pipe 1, the liquid descending ring 3 is coaxially arranged at the upper part of the outer wall of the separation pipe 1, in the embodiment, the liquid descending ring 3 is sleeved at the upper part of the outer wall of the separation pipe 1, and the liquid collecting cover 5 is arranged at the upper part of the conical drain pipe 4 and is connected with the liquid descending ring 3 to form a liquid collecting area;
the lower end of the separation pipe 1 is provided with a gas-liquid two-phase inlet 1, and a rotation starting mechanism 2 is arranged inside the separation pipe 1 so as to change the gas-liquid two-phase flow from an axial flow state to a spiral flow state;
a first-stage gas phase outlet 9 is formed in the top pipe of the conical drain pipe 4, the conical drain pipe 4 is in a cone frustum shape so as to reduce adverse effects on a gas-liquid separation process caused by the attenuation of the swirling strength in the axial direction, a plurality of spirally-rising side seams are formed along the peripheral side of the inner wall of the conical drain pipe 4 to form a liquid drainage side seam 6, and the formed liquid film can be timely drained out of the conical drain pipe 4 by the liquid drainage side seam 6; the top end of the liquid collecting cover 5 is provided with a secondary gas phase outlet 10.
Preferably, as shown in fig. 1, the taper of the tapered drain pipe 4 is 5-10 ° to reduce the adverse effect of the attenuation of the swirling strength in the axial direction on the gas-liquid separation process.
Preferably, the device further comprises a liquid blocking ring 7, as shown in fig. 4, the liquid blocking ring 7 is disposed on the upper end surface of the tapered drain pipe 4, so that the liquid film at the tapered drain pipe 4 can be effectively prevented from escaping from the primary gas phase outlet 9.
Preferably, as shown in fig. 1, the longitudinal section of the secondary gas-phase outlet 10 is in an inverted cone shape, and the diameter of the lower end is consistent with the diameter of the primary gas-phase outlet 9, so as to ensure that a large pressure loss is not generated in the process of capturing liquid drops escaping from the primary gas-phase outlet 9, and the energy consumption of operation can be reduced.
Preferably, as shown in fig. 1, the rotation starting mechanism 2 includes a flow guiding shaft 201 and a plurality of helical blades 202, the helical blades 202 in this embodiment are arranged similarly to the blades on the propeller, the helical blades 202 are fixedly mounted on the flow guiding shaft 201 and fixedly connected with the inner wall of the separation pipe 1, the gas-liquid two-phase flow is changed from an axial flow state to a helical flow state, based on the density difference of the gas-liquid two-phase, the centrifugal force respectively applied to the gas-liquid two-phase in the helical flow state is different, and the liquid phase is immediately thrown to the wall surface of the separation pipe 1 to form a liquid film.
Preferably, as shown in fig. 1 and 4, the spiral direction of the spiral blade 202 coincides with the spiral direction of the liquid discharge side slit 6, preferably clockwise, to reduce the secondary entrainment due to the inertia of the liquid phase and the shearing action of gas against it during liquid discharge, and to lower the separation efficiency.
Preferably, 6 spirally-rising liquid discharge side slits 6 are uniformly arranged on the periphery of the inner wall of the conical drain pipe 4, the included angle between the side surface of each liquid discharge side slit 6 and the central line is 60 degrees, if the number of the liquid discharge side slits is small, a liquid film cannot be discharged in time, and if the number of the liquid discharge side slits is too large, the flow field divergence is caused.
Optionally, as shown in fig. 2 and 3, the down-flow ring 3 is provided with a plurality of down-flow holes 11 for discharging separated liquid phase in time and efficiently.
The working principle is as follows:
referring to fig. 1 and 2, a gas-liquid two-phase flow enters a separation tube 1 from a gas-liquid two-phase inlet 1, the gas-liquid two-phase flow changes from an axial flow state to a spiral flow state after passing through a spiral blade 202, the gas-liquid two-phase flow is subjected to different centrifugal forces in the spiral flow state based on the density difference of the gas-liquid two-phase flow, the liquid phase is immediately thrown to the wall surface of the separation tube 11 to form a liquid film, and the liquid film is timely discharged out of the separation tube 1 through a liquid discharge side seam 6 on the side surface of a conical drain tube 4 and enters a liquid collection; the gas phase forms a gas column in the center of the separation pipe 1 and spirally advances to flow to a downstream device through a first-stage gas phase outlet 9 and a second-stage gas phase outlet 10 to complete gas-liquid separation. In the process of gas-liquid separation, due to resistance and energy dissipation, the rotational flow strength can be rapidly attenuated along the flow direction, according to the volume flow conservation principle, when a gas-liquid two-phase flow with a certain volume flow flows through the tapered drain pipe 4, the flow velocity of the gas-liquid two-phase flow is accelerated due to the reduction of the flow cross section area of the tapered drain pipe 4 in the flow direction, the rotational flow strength of the downstream gas-liquid two-phase flow can be continuously maintained to a certain extent, a gas-liquid two-phase interface is kept in a stable state, the wall surface liquid film is reduced from being broken, and secondary entrainment is reduced to the greatest extent. Meanwhile, the migration distance of the liquid drops to the wall surface in the gas-liquid two-phase flow is reduced, so that the liquid drops are quickly trapped by the wall surface. In addition, the liquid blocking ring 7 arranged on the upper end surface of the conical drain pipe 4 can effectively prevent the liquid film on the wall surface of the conical drain pipe 4 from escaping from the primary gas phase outlet 9, so that the liquid film on the wall surface can be effectively discharged out of the separation pipe 1 through the liquid discharge side seam 6 in time. Liquid phase which is not timely discharged from the liquid discharge side seam 6 enters a liquid collection area formed by the liquid collection cover 5 and the liquid descending ring 3 through the primary gas phase outlet 9, gas-liquid two phases are still in a spiral state in the liquid collection area, the liquid phase can be thrown to the inner wall of the liquid collection cover to form a liquid film, a gravity sedimentation effect is achieved, the liquid film is gathered at the liquid descending ring 3 and discharged through the liquid descending holes 11, liquid phase separated from the gas-liquid two phases is discharged through the liquid descending holes 11 in the liquid descending ring 3, clean gas phase flows into a downstream device through the secondary gas phase outlet 10, and efficient gas-liquid separation is achieved.
The liquid drainage side seam 6 is designed to effectively drain liquid films separated on the wall surface in time, has strong working condition adaptability, and can realize higher gas-liquid separation efficiency under the working condition of large gas-liquid ratio or small gas-liquid ratio.
The design of the conical drain pipe 4 effectively overcomes the adverse effect of the downstream rotational flow attenuation on gas-liquid two-phase separation, ensures high-efficiency separation efficiency, and ensures that higher gas-liquid separation efficiency is realized under the condition of smaller pressure loss.
Meanwhile, the structure is simple, the operation and maintenance are convenient, and the equipment cost is reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (8)
1. A gas-liquid separation device based on a cyclone separation technology is characterized by comprising: the separation tube, the conical drain tube, the liquid collecting cover and the liquid descending ring;
the conical drain pipe is arranged at the upper part of the separation pipe and is coaxially communicated with the separation pipe, the liquid descending ring is coaxially arranged at the upper part of the outer wall of the separation pipe, and the liquid collecting cover is arranged at the upper part of the conical drain pipe and is connected with the liquid descending ring;
the lower end of the separation pipe is provided with a gas-liquid two-phase inlet, and a rotation starting mechanism is arranged in the separation pipe so that gas-liquid two-phase flow rises in a spiral flowing state;
the top pipe of the conical drainage pipe is provided with a primary gas phase outlet, the conical drainage pipe is in a cone frustum shape, and a plurality of spirally-rising side seams are arranged along the periphery of the inner wall of the conical drainage pipe to form a liquid drainage side seam;
and a secondary gas phase outlet is formed in the top end of the liquid collection cover.
2. The gas-liquid separation device based on the cyclone separation technology as claimed in claim 1, wherein the taper of the tapered drain pipe is 5-10 °.
3. The gas-liquid separation device based on cyclone separation technology of claim 1, further comprising a liquid blocking ring, wherein the liquid blocking ring is arranged on the upper end surface of the conical drain pipe.
4. The cyclone-based gas-liquid separation device according to claim 1, wherein the longitudinal section of the secondary gas phase outlet is in an inverted cone shape, and the diameter of the lower end is identical to that of the primary gas phase outlet.
5. The gas-liquid separation device based on cyclone separation technology of claim 1, wherein the rotation starting mechanism comprises a flow guide shaft and a plurality of helical blades, and the helical blades are fixedly arranged on the flow guide shaft and fixedly connected with the inner wall of the separation pipe.
6. The gas-liquid separation apparatus based on a cyclonic separating technique according to claim 5, wherein the helical direction of the helical blade coincides with the helical direction of the discharge side slit.
7. The gas-liquid separation apparatus based on cyclone separation technology as claimed in claim 1, wherein 6 spirally rising liquid discharge side slits are uniformly arranged on the inner wall circumference side of the conical drainage pipe, and the included angle between the side surface of the liquid discharge side slit and the center line is 60 °.
8. The gas-liquid separation device based on cyclone separation technology as claimed in claim 1, wherein the downcomer ring is provided with a plurality of downcomer holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010402608.2A CN111420472A (en) | 2020-05-13 | 2020-05-13 | Gas-liquid separation device based on cyclone separation technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010402608.2A CN111420472A (en) | 2020-05-13 | 2020-05-13 | Gas-liquid separation device based on cyclone separation technology |
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| CN111420472A true CN111420472A (en) | 2020-07-17 |
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| CN202010402608.2A Pending CN111420472A (en) | 2020-05-13 | 2020-05-13 | Gas-liquid separation device based on cyclone separation technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554862A (en) * | 2020-12-03 | 2021-03-26 | 四川科宏石油天然气工程有限公司 | Cyclone separator for shale gas exploitation |
| CN114570118A (en) * | 2022-05-06 | 2022-06-03 | 北京石油化工学院 | Multistage separation effect is integrated tubular vapour and liquid separator in coordination |
-
2020
- 2020-05-13 CN CN202010402608.2A patent/CN111420472A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554862A (en) * | 2020-12-03 | 2021-03-26 | 四川科宏石油天然气工程有限公司 | Cyclone separator for shale gas exploitation |
| CN112554862B (en) * | 2020-12-03 | 2022-11-29 | 四川科宏石油天然气工程有限公司 | Cyclone separator for shale gas exploitation |
| CN114570118A (en) * | 2022-05-06 | 2022-06-03 | 北京石油化工学院 | Multistage separation effect is integrated tubular vapour and liquid separator in coordination |
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