CN110075619A - A kind of width process multi-streaming type high efficient gas and liquid separator - Google Patents

Abstract

The purpose of the present invention is to provide a wide-flow multi-flow high-efficiency gas-liquid separator, which includes an outer cylinder and an inner cylinder, the inner cylinder extends into the outer cylinder, and the lower end of the inner cylinder stays outside the outer cylinder , a first-stage impeller is installed in the middle of the inner cylinder, and a second-stage impeller is installed on the top of the inner cylinder. The liquid discharge hole in the inner space of the body and the inner space of the outer cylinder. The lower end of the outer cylinder is provided with a liquid phase outlet of the separator, and the top of the outer cylinder is provided with a gas phase outlet of the separator. A separation chamber that allows the liquid phase to fall back. The invention comprehensively utilizes the centrifugal separation principle, the gravity separation principle and the inertial separation principle, the device has a simple and compact structure, and can realize high-efficiency gas-liquid separation in a wide flow range and under multi-flow patterns.

Description

A wide-flow multi-flow high-efficiency gas-liquid separator

technical field

The invention relates to a gas-liquid separator, in particular to a gas-liquid separator in the field of nuclear energy.

Background technique

Today, when the energy problem is becoming more and more prominent, nuclear energy, as a clean energy source, has received more and more attention. As a key technology in the development of nuclear energy, gas-liquid separation technology has also received more and more attention. Before the gas-liquid mixture to be separated enters the separator, the flow pattern change caused by the change of the gas phase and liquid phase conversion velocity will cause the flow characteristics of the gas-liquid two-phase mixture to change, especially when it is in an unstable flow pattern The gas-liquid two-phase mixture will vibrate violently, which brings new challenges to the current gas-liquid separation technology.

At present, the existing gas-liquid separation devices can be divided into: gravity gas-liquid separator, centrifugal gas-liquid separator, and inertial gas-liquid separator according to the working principle. Of course, there are also some gas-liquid separators that integrate multiple principles. . Limited by the use of space, operating environment, and the state of the gas-liquid mixture to be separated, centrifugal gas-liquid separators and multi-principle separators based on the principle of centrifugal separation are favored due to their small size, light weight, high efficiency and fast speed. focus on. According to the principle of generating centrifugal force, it can be generally divided into: tangential injection centrifugal separator and axial flow centrifugal separator. The tangential injection centrifugal separator relies on injecting the gas-liquid mixture tangentially to generate centrifugal force. It has the advantages of simple structure, no moving parts, and high reliability. It is currently the most widely used centrifugal separator ("a new type of dual Cone angle hydrocyclone", CN205887222U; "An adjustable split ratio hydrocyclone device", N206425106U), but it has poor stability of the gas core, large pressure drop, high turbulence, low separation efficiency, etc. question. Different from the tangential injection centrifugal separator, the axial flow centrifugal separator uses the impeller to generate centrifugal force, which has the advantages of low turbulence and small pressure drop ("a rotary vane multi-stage micro-bubble screening device", CN107684983A; Lu Ming Chao, Li Yazhou, Xiong Zhenqin. Experimental Research on the Performance of Steam-Water Separator[J]. Chinese Journal of Power Engineering, 2013.33(1):77-80), but the existing axial-flow gas-liquid separators are mainly for stable flow patterns. Designed to not operate efficiently when the gas-liquid mixture is in an unstable flow regime. However, although the existing combined gas-liquid separator combines a variety of separation principles and has a certain degree of improvement in the separation effect, the design process does not consider all changes in the flow pattern of the gas-liquid mixture before entering the separator. The problem brought about is that when the flow pattern of the gas-liquid mixture changes before entering the separator, especially when the gas-liquid mixture is in an unstable flow pattern, the separation performance of the separator cannot be guaranteed ("a cyclone combination Gas-liquid high-efficiency separation device", CN106492544A).

Most of the current gas-liquid separators are single-principle separators. Although there are a few separators that combine multiple principles, they are basically designed for a single and stable flow pattern. Separators that operate efficiently in a steady flow pattern. However, in the actual application process of nuclear energy development, due to the change of gas-liquid ratio and conversion speed in the gas-liquid mixture, the flow pattern of the gas-liquid mixture will often change, which will affect the performance of the separator. Moreover, due to the characteristics of the nuclear power plant itself, there are often problems such as a small space for use and high maintenance costs.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a wide-flow multi-flow type high-efficiency gas-liquid separator that solves the problem of single applicable flow type of the separator in the current gas-liquid separation technology field and lack of high-efficiency operation under multi-flow type.

The purpose of the present invention is achieved like this:

The present invention is a wide-flow multi-flow type high-efficiency gas-liquid separator, which is characterized in that it includes an outer cylinder and an inner cylinder, the inner cylinder extends into the outer cylinder, and the lower end of the inner cylinder stays outside the outer cylinder , a first-stage impeller is installed in the middle of the inner cylinder, and a second-stage impeller is installed on the top of the inner cylinder. The liquid discharge hole in the inner space of the body and the inner space of the outer cylinder. The lower end of the outer cylinder is provided with a liquid phase outlet of the separator, and the top of the outer cylinder is provided with a gas phase outlet of the separator. A separation chamber that allows the liquid phase to fall back.

The present invention may also include:

1. The hub of the first-stage impeller is a solid structure, and the hub of the second-stage impeller is a hollow structure.

2. The upper edge of the blade of the second-stage impeller is flush with the upper edge of the inner cylinder.

3. The gas phase outlet of the separator is a tube extending to the inside of the outer cylinder. A separation baffle is set in the outer cylinder below the gas phase outlet of the separator. The separation baffle and the outer cylinder above it are pulled by the separation baffle. The tendons are connected.

4. The tangent direction of the inlet end of the first-stage impeller blade is parallel to the central axis of the inner cylinder, the included angle between the tangential direction of the outlet end of the first-stage impeller blade and the central axis of the inner cylinder is 55°±5°, and the angle between the inlet end of the second-stage impeller blade The included angle between the tangential direction and the central axis of the inner cylinder is 15°±1°, and the included angle between the tangential direction of the outlet end and the central axis of the inner cylinder is 55°±5°.

The advantage of the present invention is that: the present invention realizes the efficient separation of gas-liquid mixture under multi-flow pattern and wide flow, especially in unstable flow pattern, through the organic combination of three separation methods: centrifugal separation, gravity separation and inertial separation. The device enables:

(1) A wide-flow multi-flow type high-efficiency gas-liquid separator provided by the present invention utilizes a double-layer cylinder structure nested in each other, and is separated in the separator by two-stage impellers, a liquid discharge section, and an outer cylinder. The cooperation of the chamber and the separation baffle comprehensively utilizes the three separation principles of centrifugal separation, gravity separation and inertial separation, and realizes efficient separation in multi-flow patterns, especially in unstable flow patterns.

(2) The first-stage impeller is a solid structure, and the second-stage impeller is a hollow structure, which independently establishes a flow channel for the gas phase. After the gas-liquid mixture passes through the first-stage impeller, under the action of centrifugal force, the gas phase aggregates toward the center to form a gas core, and the liquid phase aggregates on the wall of the outer cylinder to form an annular liquid film. The gas phase and a small part of the liquid directly enter the separation chamber of the outer cylinder through the hollow channel of the hub of the second-stage impeller. The annular liquid film first passes through the liquid discharge section and then enters the flow channel between the blades of the second-stage impeller, which further increases the rotation speed. Intensity, so that the remixing of the gas-liquid two phases on the wall greatly reduces the carrying effect of the gas phase.

(3) The upper edge of the blades of the second-stage impeller is flush with the upper edge of the inner cylinder, which ensures that the liquid phase between the different flow channels of the blades of the second-stage impeller is directly thrown to the separation chamber of the outer cylinder after leaving the blades, This prevents the liquid phases from recombining to form a complete annular liquid film, which in turn causes the impact height of the liquid phase in the separation chamber of the outer cylinder to be too high.

(4) After passing through the primary impeller and the liquid phase to form an annular liquid film, the gas-liquid mixture can separate part of the liquid in advance when passing through the liquid discharge section between the primary and secondary impellers, so as to realize the primary separation of the gas-liquid two-phase mixture. Reduce the separation pressure of the subsequent separation structure.

(5) The design of the separation baffle and the inward extension of the gas phase outlet can perform inertial separation of the liquid droplets entrained in the liquid phase at the liquid phase outlet of the separator to further improve the separation efficiency.

(6) The tangent direction of the inlet end of the first-stage impeller blade is parallel to the central axis, while the tangent direction of the inlet end of the second-stage impeller blade has a certain angle with the central axis, which ensures that the pressure loss of the two-phase fluid when entering the separator is as small as possible small.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2a is a front view of the first-stage impeller structure, and Figure 2b is a top view of the first-stage impeller structure;

Fig. 3a is a front view of the two-stage impeller structure, and Fig. 3b is a top view of the two-stage impeller structure.

Detailed ways

The present invention is described in more detail below in conjunction with accompanying drawing example:

In combination with Fig. 1-3b, a combined multi-flow type high-efficiency gas-liquid separator provided by the present invention includes an inner cylinder 1, an inlet flange 2, a first-stage impeller 3, a second-stage impeller 4, and a liquid discharge section 5 , Antivibration strip 6, Separation baffle tension rib 7, Separation baffle 8, Separator gas phase outlet 9, Outlet flange 10, Outer cylinder 11, Separator liquid phase outlet 12, Separator outer cylinder separation chamber 13. The main structure is composed of two layers of mutually nested cylinder structures, the outer layer is the outer cylinder 11, the inner layer is the inner cylinder 1, the anti-vibration strip 6 is installed between the inner cylinder 1 and the outer cylinder 11, and the gas phase outlet of the separator 9 is arranged on the top of the separator, and the liquid phase outlet 12 of the separator is arranged at the bottom of the outer cylinder 11, which are arranged symmetrically and serve as backups for each other; a first-stage impeller 3 is arranged inside the inner cylinder 1 along the flow direction of the gas-liquid mixture And the second-stage impeller 4, the first-stage impeller 3 is arranged in the middle of the inner cylinder 1, the second-stage impeller 4 is arranged on the top of the inner cylinder 1; the inner wall of the inner cylinder 1 between the first-stage impeller 3 and the second-stage impeller 4 The liquid discharge section 5 is arranged on the top, and a certain number of liquid discharge holes are arranged in the liquid discharge section; an inertial separation baffle 8 is arranged at the inlet end of the gas phase outlet 9 of the separator; the separation between the secondary impeller 4 and the separation baffle 8 The separation chamber 13 of the outer cylinder has enough space to ensure that the gravity has a sufficient vertical distance to make most of the liquid phase fall back.

The hub of the first-stage impeller 3 is a solid structure, and the hub of the second-stage impeller 4 is a hollow structure to establish a separate gas phase circulation channel, and the inner diameter of the channel is larger than the outer diameter of the hub of the first-stage impeller 3 .

The upper edge of the vane of the second-stage impeller 4 is flush with the upper edge of the inner cylinder 1, so as to effectively reduce the impact height of the liquid under high flow rate conditions.

The liquid discharge section 5 can be provided with one or more sections, and the number of openings, the form of the openings, and the arrangement of the openings can be set according to the actual use conditions.

The gas phase outlet 9 of the separator extends a part to the inside of the outer cylinder 11 to limit the entrainment of the gas at the gas phase outlet 9 of the separator at a high flow rate; and the separation baffle 8 can also be replaced by other inertial separation structures, such as : corrugated board, wire mesh.

The tangent direction of the inlet end of the first-stage impeller 3 blades is parallel to the central axis of the inner cylinder 1, the angle between the tangential direction of the outlet end and the central axis of the inner cylinder 1 is 55°, and the tangential direction of the inlet end of the second-stage impeller 4 blades is parallel to the inner cylinder The angle between the central axis of body 1 is 15°, the angle between the tangent direction of the outlet end and the central axis of inner cylinder 1 is 55°, and the number of blades of the two impellers is 5, which can ensure the flow of two-phase fluid between the blades Full rotation in the lane.

In the gas-liquid separation process, the technical scheme of the gas-liquid separator device is: first, the separator is fixedly installed through the inlet flange 2 and the outlet flange 10. During the operation of the separator, the gas-liquid mixture first enters the interior of the gas-liquid separator device through the inlet of the inner cylinder 1, and after flowing through the first-stage impeller 3, it changes from a normal linear motion to a rotary motion, generating centrifugal force while rotating . Under the action of centrifugal force, the gas phase with lower density gathers in the center of the inner cylinder 1 to form a gas core; the liquid phase with higher density accumulates on the wall of the inner cylinder 1 and forms an annular liquid film to realize phase separation. After passing through the first-stage impeller 3, the gas-liquid mixture continues to move upward inside the inner cylinder 1, and when flowing through the liquid discharge section 5, part of the liquid phase in the annular liquid film enters the inner cylinder through the opening of the liquid discharge section 5 1 enters the annular cavity between the outer cylinders 11, and flows through the liquid phase outlet of the separator to leave the separator to realize a centrifugal separation. Due to the effects of friction and dissipation, the rotational strength of the gas-liquid two-phase will be attenuated to a certain extent, that is, the centrifugal force will be weakened to a certain extent. After passing through the liquid discharge section 5, the gas-liquid two-phase continues to move upward, and the subsequent phenomenon is different under the condition of high gas content and low gas content, which will be described separately below.

Under the condition of low gas content, the gas flow rate is low and the flow pattern is relatively stable. The gas phase and a small amount of liquid phase move upward through the middle hole channel established by the hub of the second-stage impeller 4, and then enter the separation chamber 13 of the outer cylinder. The gas phase outlet 10 of the separator leaves the separator, and the liquid phase falls back into the ring cavity between the inner cylinder 1 and the outer cylinder 11 under the action of gravity to realize secondary gravity separation, and then leaves the separation through the liquid phase outlet of the separator device. After the liquid phase and a small amount of gas phase pass through the channel between the impellers, the rotation intensity increases and the centrifugal force is further enhanced. After leaving the second-stage impeller blade 4, under the action of centrifugal force, the liquid phase with higher density is thrown towards the inner wall of the outer cylinder 11, and falls back into the ring cavity between the inner cylinder 1 and the outer cylinder 11 under the force of gravity and leave the separator, the gas phase moves upwards and leaves the separator through the upper chamber 13 of the outer cylinder and the gas phase outlet 9 of the separator respectively, finally completely realizing the gas-liquid separation.

Under the condition of high gas content, the gas flow rate is high, and the gas-liquid two-phase mixture may be in an unstable flow pattern such as agitated flow or annular flow conditions. The annular liquid film formed after passing through the first-stage impeller 3 and a small amount of gas enter the channel between the blades of the second-stage impeller 4, the rotational strength increases, and the centrifugal force is further enhanced. After leaving the blades of the second-stage impeller 4, the liquid phase will not be thrown to the inner wall of the outer cylinder 11 of the separator under the action of centrifugal force, and the liquid phase will continue to move upward along the inner wall of the outer cylinder 11 under the influence of gas entrainment and flow pattern oscillation , part of the liquid phase will move to the gas phase outlet 9 of the separator, and part of the liquid phase will fall back into the annular cavity between the outer cylinder 11 and the inner cylinder 1 on the way. Due to the blocking effect of the inwardly extending part of the gas-phase outlet 9 of the separator, the liquid arriving at the gas-phase outlet 9 of the separator will not enter the gas-phase outlet 9 of the separator due to the influence of gas entrainment, thereby affecting the separation efficiency. Part of the liquid eventually falls back and passes through the separation chamber 13 of the outer cylinder and the annular cavity between the outer cylinder 11 and the inner cylinder 1 successively, and finally leaves the separator. The gas core and a small amount of liquid phase formed after the first-stage impeller 3 enter the circulation channel established by the hollow hub of the second-stage impeller 4, and then enter the separation chamber 13 of the outer cylinder. The impact height in the barrel separation chamber 13 is relatively high. Among them, the liquid droplets with larger diameter fall back into the annular cavity between the outer cylinder 11 and the inner cylinder 1 under the action of gravity, and leave the separator, thereby realizing secondary gravity separation; The gas phase moves upwards under the action of the separation baffle 8, and the small liquid droplets carried in the gas phase are separated, while the gas phase leaves the separator through the gas phase outlet 9 of the separator, thereby realizing three times of inertial separation, and finally realizing the whole separation process.

Claims (9)

1. a kind of width process multi-streaming type high efficient gas and liquid separator, it is characterized in that: including outer barrel, inner cylinder, inner cylinder is stretched to Inside outer barrel, the lower end of inner cylinder is stayed in outside outer barrel, and one stage impeller, the top of inner cylinder are installed in the middle part of inner cylinder Sencond stage impeller is installed, drain section is set on the inner cylinder between one stage impeller and sencond stage impeller, connection is set on drain section Separator liquid phase outlet, outer cylinder is arranged in the drainage hole of inner cylinder inner space and outer barrel inner space, outer barrel lower end Separator gas phase outlet is set at the top of body, the disengagement chamber between sencond stage impeller and separator gas phase outlet to fall liquid phase after rise Room.

2. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 1, it is characterized in that: the wheel of one stage impeller Hub is solid construction, and the wheel hub of sencond stage impeller is hollow structure.

3. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 1 or 2, it is characterized in that: sencond stage impeller Blade on along on inner cylinder along concordant.

4. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 1 or 2, it is characterized in that: separator gas Phase outlet is the pipe that outside inner barrel extends, and skimming baffle is arranged in the outer barrel below separator gas phase outlet, point It is connected between outer barrel from baffle and above it by skimming baffle lacing wire.

5. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 3, it is characterized in that: separator gas phase is drawn Outlet is the pipe that outside inner barrel extends, and skimming baffle, separation gear are arranged in the outer barrel below separator gas phase outlet It is connected between plate and outer barrel above it by skimming baffle lacing wire.

6. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 1 or 2, it is characterized in that: one stage impeller The tangential direction at blade inlet end and the centerline axis parallel of inner cylinder, the tangential direction and inner cylinder at one stage impeller blade exit end The angle of the central axis of body is 55 ° ± 5 °, the central axis of the tangential direction and inner cylinder at sencond stage impeller blade inlet end Angle is 15 ° ± 1 °, and the angle of the central axis of the tangential direction and inner cylinder of outlet end is 55 ° ± 5 °.

7. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 3, it is characterized in that: one stage impeller blade The tangential direction of arrival end and the centerline axis parallel of inner cylinder, the tangential direction at one stage impeller blade exit end and inner cylinder The angle of central axis is 55 ° ± 5 °, the angle of the central axis of the tangential direction and inner cylinder at sencond stage impeller blade inlet end It is 15 ° ± 1 °, the angle of the central axis of the tangential direction and inner cylinder of outlet end is 55 ° ± 5 °.

8. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 4, it is characterized in that: one stage impeller blade The tangential direction of arrival end and the centerline axis parallel of inner cylinder, the tangential direction at one stage impeller blade exit end and inner cylinder The angle of central axis is 55 ° ± 5 °, the angle of the central axis of the tangential direction and inner cylinder at sencond stage impeller blade inlet end It is 15 ° ± 1 °, the angle of the central axis of the tangential direction and inner cylinder of outlet end is 55 ° ± 5 °.

9. a kind of wide process multi-streaming type high efficient gas and liquid separator according to claim 5, it is characterized in that: one stage impeller blade The tangential direction of arrival end and the centerline axis parallel of inner cylinder, the tangential direction at one stage impeller blade exit end and inner cylinder The angle of central axis is 55 ° ± 5 °, the angle of the central axis of the tangential direction and inner cylinder at sencond stage impeller blade inlet end It is 15 ° ± 1 °, the angle of the central axis of the tangential direction and inner cylinder of outlet end is 55 ° ± 5 °.