CN110886601A - A spring-type liquid level adaptive gas-liquid separator - Google Patents

Abstract

The invention aims to provide a spring type liquid level self-adaptive gas-liquid separator which comprises an outer cylinder and a core cylinder, wherein the upper part of the core cylinder extends into the outer cylinder, the lower part of the core cylinder extends out of the bottom of the outer cylinder, an impeller is arranged in the core cylinder, a liquid discharge section is arranged at the upper part of the core cylinder, a gas phase lead-out opening is arranged at the top of the outer cylinder, a water baffle is arranged below the gas phase lead-out opening of the separator, the water baffle is connected with the top of the outer cylinder through a connecting rod, a liquid phase lead-out opening is arranged at the lower part, the liquid phase outlet comprises an inlet pipe, a sudden expansion pipe and an outlet pipe which are sequentially communicated, the inlet pipe is connected with the outer barrel and is communicated with the inside of the outer barrel, a baffle is arranged at the joint of the sudden expansion pipe and the inlet pipe, a positioning pipe is arranged at the joint of the sudden expansion pipe and the outlet pipe, a spring is arranged on the baffle, the other end of the spring is positioned in the positioning pipe, an inlet flange is arranged outside the bottom of the core barrel, and an outlet flange is arranged at the top of the gas phase outlet. The invention can realize high-efficiency separation without external intervention for regulating and controlling the liquid level.

Description

A spring-type liquid level adaptive gas-liquid separator

technical field

The invention relates to a gas-liquid separation device, in particular to a downhole gas-liquid separation device.

Background technique

Gas-liquid separation technology has a wide range of applications in petrochemical, energy utilization, nuclear energy development and other fields. Downhole gas-liquid separation is of great significance for oil exploitation and prolonging the economic life of high liquid-containing wells. The gas-liquid mixture to be separated downhole has the characteristics of wide variation range of gas-liquid flow and various flow patterns.

At present, a variety of high-efficiency gas-liquid separators suitable for a wide range of gas-liquid flow and diversified flow patterns have been proposed ("a double-barrel gas-liquid separator", CN 110075622A; "a wide-flow multi-flow type high-efficiency gas-liquid separator" Separator", CN 110075619A; "A combined high-efficiency gas-liquid separator", CN 110075618A; "A refined gas-liquid separator", CN110075623A). However, the above-mentioned separator requires precise adjustment of the liquid level in the annular cavity to achieve efficient separation. If the liquid level in the separator is too low, a large number of bubbles will flow out with the liquid, and if the liquid level is too high, the gas phase outlet will carry a large number of droplets ( C.Zheng,W.Yang,G.Wang,G.Fan,C.Yan,X.Zeng,and A.Liu,"Experimental Study on a New Type of Separator for Gas Liquid Separation,"Frontiers in EnergyResearch,vol.7 , 2019-09-13 2019).

In the actual operation of the separator, the inlet liquid flow is constantly changing, and the change in the inlet flow also causes the liquid level in the separator to change. In order to ensure efficient separation, the liquid level must be continuously adjusted to stabilize within a suitable interval height. However, there are the following problems in precise liquid level control of downhole gas-liquid separators:

1. The gas-liquid separator is installed at a distance of 1,000 meters underground, and the space is small, and personnel cannot reach the installation position of the separator to perform manual liquid level control in real time;

2. The hole of the oil well is narrow, only slightly larger than the diameter of the pipeline, and it is very difficult to arrange the supporting equipment such as measurement and control. At the same time, when the equipment is damaged, the entire pipeline needs to be taken out, and the maintenance cost is high;

3. The operating environment pressure of the separator is as high as several MPa, and the measuring device that can operate normally in this high-pressure environment cannot meet the accuracy requirements of liquid level measurement;

4. The liquid outlet flow is controlled by the ground cable, which has poor control sensitivity and hysteresis, which cannot meet the requirements of precise real-time control.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a spring-type liquid level self-adaptive gas-liquid separator for use in underground wells, which can achieve high-efficiency separation without external intervention to regulate the liquid level.

The object of the present invention is achieved in this way:

The present invention is a spring-type liquid level self-adaptive gas-liquid separator, which is characterized in that it comprises an outer cylinder and a core cylinder, the upper part of the core cylinder extends into the interior of the outer cylinder, and the lower part of the core cylinder extends to the outside of the bottom of the outer cylinder , the impeller is installed in the core cylinder, the upper part of the core cylinder is provided with a drainage section, the top of the outer cylinder is equipped with a gas phase outlet, and a water baffle is arranged below the gas phase outlet of the separator, and the water baffle is connected to the top of the outer cylinder through a connecting rod , a liquid phase outlet is installed at the lower part of the outer cylinder, and the liquid phase outlet includes an inlet pipe, a sudden expansion pipe, and an outlet pipe that are connected in sequence. The inlet pipe is connected to the outer cylinder and communicated with the inside of the outer cylinder. The inlet pipe and the outlet pipe, a baffle is set at the connection between the sudden expansion pipe and the inlet pipe, a positioning pipe is set at the connection between the sudden expansion pipe and the outlet pipe, a spring is installed on the baffle, the other end of the spring is located in the positioning pipe, and the bottom of the core tube is outside. Install the inlet flange, and install the outlet flange on the top of the gas phase outlet.

The present invention can also include:

1. The angle between the tangent of the outlet end of the core cylinder and the central axis of the inner cylinder is 60°.

2. A development section with a length of 4 to 10 times the inner diameter of the core tube is left between the discharge section and the upper edge of the impeller blade.

3. An anti-vibration strip is arranged between the core cylinder and the outer cylinder, and the anti-vibration strip is arranged at the height of the lower edge of the blade of the impeller.

The present invention is a spring-type liquid level self-adaptive gas-liquid separator, which is characterized in that it comprises an outer cylinder and a core cylinder, the upper part of the core cylinder extends into the interior of the outer cylinder, and the lower part of the core cylinder extends to the outside of the bottom of the outer cylinder , the first-stage impeller is installed in the core tube, the upper part of the core tube is equipped with a drainage section, the outlet of the core tube is equipped with a second-stage impeller, the top of the outer tube is equipped with a gas phase outlet, and a water baffle is set below the gas phase outlet of the separator to prevent The water plate is connected with the top of the outer cylinder through a connecting rod, and a liquid phase outlet is installed at the lower part of the outer cylinder. The inside of the outer cylinder is communicated, the width of the sudden expansion pipe is larger than that of the inlet pipe and the outlet pipe. One end is located in the positioning pipe, the inlet flange is installed outside the bottom of the core tube, and the outlet flange is installed on the top of the gas phase outlet.

The present invention can also include:

4. There is a distance between the outlet of the core tube and the water blocking plate, so that a gravity separation chamber is formed on the upper part of the outer tube.

5. The outer diameter of the water baffle is larger than the inner diameter of the gas phase outlet and the core tube.

6. The gas phase outlet of the separator extends to the inside of the outer cylinder of the separator.

7. The inner diameter of the baffle is larger than the inner diameter of the inlet pipe and smaller than the inner diameter of the sudden expansion pipe; the length of the positioning pipe is larger than the length when the spring is pressed.

8. An anti-vibration strip is arranged between the core cylinder and the outer cylinder, and the anti-vibration strip is arranged between the first-stage impeller and the drainage section.

The advantage of the present invention is that it can meet the requirements of high-efficiency gas-liquid separation in the case of gas-liquid flow changes, different flow patterns, especially oscillating flow patterns, without the need for personnel to participate in the regulation. The device can achieve:

(1) The separator uses a multi-layered sleeve structure, and comprehensively utilizes centrifugal separation and gravity separation through the cooperation of the impeller 3, the liquid discharge section 4, the separation baffle 6, and the gravity separation chamber 11. The high-efficiency separation of gas-liquid mixture is realized under wide liquid flow rate, large gas content range, multi-flow pattern, especially oscillating flow pattern.

(2) The liquid discharge section 4 provided by the impeller 3 and the core barrel 1 effectively weakens the axial impact under the oscillating flow pattern, reduces the impact height and strength of the axial oscillating fluid, and reduces the possibility of gas-to-liquid carryover improved the separation efficiency.

(3) The outer diameter of the water blocking plate 6 is larger than the inner diameter of the gas phase outlet 8 of the separator and the inner diameter of the core cylinder 1, which can effectively avoid the entrainment of the gas phase under the condition of high gas content, and the liquid phase is directly separated from the gas phase outlet 8 of the separator. Open the separator.

(4) Under the condition of high gas content, due to the entrainment of the gas phase, part of the liquid will reach the top of the outer cylinder 10 of the separator and further enter the gas phase outlet 8 of the separator. The blocking effect is beneficial to improve the separation efficiency.

(5) Under the condition that the inlet flow rate of the separator is constantly changing, the self-adjusting ability of the spring 13 is used to control the gap between the baffle 14 and the protruding expansion section of the liquid phase outlet 12, so that the liquid level in the annular cavity of the core cylinder 1 and the outer cylinder 10 is controlled. Stable at a certain height, there will be no situation where the low liquid level bubbles flow away from the liquid phase outlet or the liquid level is too high to reduce the separation efficiency, which enhances the self-adaptive ability of the separator and expands the use range of the separator.

(6) The setting of the baffle 14 can prevent the backflow of the liquid caused by the external environment or the pressure fluctuation in the separator chamber.

(7) Change the inner diameter and quantity of the liquid phase outlet 12 to achieve liquid level control of fluids with different physical properties and different flow ranges.

(8) Adjusting the difference between the inner diameter of the baffle plate 14 and the inner diameter of the protruding expansion section of the liquid phase outlet 12 can realize the control of the liquid level height in the annular cavity of the inner cylinder 1 and the outer cylinder 10, which is suitable for gas in different types and flow ranges. liquid separation.

(9) The arrangement of the positioning tube 15 can reduce the damage to the spring 13 due to flow fluctuation, and prevent the over-compression of the spring 13 from causing the baffle 14 and the liquid phase outlet 12 to protrude and expand the tube wall gap too small, so that the discharge flow is limited.

Description of drawings

FIG. 1 is a schematic diagram of the overall cross-sectional structure of Embodiment 1 of the present invention;

Fig. 2 is A-A sectional view in Fig. 1;

Fig. 3 is a partial enlarged view in Fig. 1;

Fig. 4 is B-B sectional view in Fig. 3;

FIG. 5 is a schematic diagram of an overall cross-sectional structure of Embodiment 2 of the present invention.

Detailed ways

The present invention will be described in more detail below in conjunction with the accompanying drawings:

Embodiment 1: with reference to Figures 1-4, the main structure of the separator is composed of mutually sleeved cylinder structures, namely: an outer cylinder 10, a core cylinder 1, the gas phase outlet 8 of the separator is located on the top of the outer cylinder 10, and the separator The liquid phase outlet 12 is located at the bottom of the outer cylinder 10; the lower part of the gas phase outlet 8 is provided with a water baffle 6, which is fixed on the top cover of the outer cylinder 10 by the connecting rod 7; the upper part of the core cylinder 1 is provided with a drainage section 4. A drain hole is provided in the drain section 4; an impeller 3 is arranged below the drain section 4 in the core barrel 1; an anti-vibration strip 5 is arranged between the impeller 3 and the outer cylinder 10; A positioning tube 15, a spring 13 and a baffle 14 are provided. Between the discharge section 4 and the upper edge of the blades of the impeller 3, a development section with a length of 4 to 10 times the inner diameter of the core tube 1 is reserved. The length of the development section is too short, the gas does not fully gather in the middle, and the bubbles are carried by the liquid from the discharge hole. Discharge, the development section is too long, the centrifugal force is weakened, the gas core is unstable, the bubbles are also carried by the liquid and discharged from the discharge hole, and the diameter of the discharge hole increases in turn along the flow direction of the gas-liquid mixture. The outer diameter of the water baffle 6 is larger than the inner diameter of the gas phase outlet 8 of the separator and the inner diameter of the core cylinder 1 , and is fixed on the top cover of the outer cylinder 10 of the separator through the connecting rod 7 . The separator gas phase outlet 8 extends toward the inside of the separator outer cylinder 10 . A space is left between the outlet of the core tube 1 and the water blocking plate 6 , so that a gravity separation chamber 14 is formed on the upper part of the outer tube 10 . The angle between the tangent of the outlet end of the core tube 1 and the central axis of the inner tube is 60°, and the liquid is ejected in the tangential direction, which shortens the axial impact height of the liquid. An anti-vibration strip 5 is provided between the inner cylinder 1 and the outer cylinder 10 of the separator, and the anti-vibration strip 5 is arranged at the height of the lower edge of the blade of the impeller 3 . The liquid phase lead-out port 12 is located at the bottom of the outer cylinder 10, and the liquid phase lead-out port 12 has a pipe section of a sudden expansion and contraction structure. A positioning tube 15 , a spring 13 and a baffle 14 are arranged in the protruding expansion section of the liquid phase lead-out port 12 . The positioning tube 15 is annularly fixed on the wall of the protruding expansion tube at the outlet side of the liquid phase outlet 12 , one end of the spring 13 is fixed in the positioning tube 15 , and the other end of the spring 13 is connected to the baffle 14 . The inner diameter of the baffle plate 14 is larger than the inner diameter of the inlet pipe section of the liquid phase outlet 12 and smaller than the inner diameter of the sudden expansion section. The length of the positioning tube 15 is greater than the length of the spring 13 when it is pressed.

During gas-liquid separation, the technical solution is: the body of the separator is installed and fixed through the inlet flange 2 and the outlet flange 9 . The gas-liquid mixture enters the separator from the inlet end of the cartridge 1. When flowing through the impeller 3, under the guiding action of the rotating blades of the impeller 3, the gas-liquid mixture changes from linear motion to rotational motion, and generates centrifugal force. Under the action of centrifugal force, after sufficient development, the gas phase with lower density aggregates to form a gas core, and the liquid phase with higher density forms an annular liquid film around the gas core. When the gas-liquid mixture flows through the liquid discharge section 4, part of the liquid in the annular liquid film enters the annular cavity between the separator cartridge 1 and the outer cylinder 10 through the liquid discharge hole of the liquid discharge section 4. After passing through the liquid discharge section 4 , the gas-liquid mixture continues to move upward and leaves the core tube 1 , enters the gravity separation chamber 11 , and then enters the liquid phase outlet 12 pipe section. For the baffle 14 at the sudden expansion of the liquid phase outlet 12, the force on the outlet side of the liquid phase outlet is F ₁ , and the force at the inlet of the liquid phase outlet is F ₂ :

F ₁ =F _k +P ₁ A (1-1)

F ₂ =(P ₂ +ρgh)S (1-2)

where:

F _k : the elastic force of the spring to the baffle;

P ₁ : pressure on the liquid phase outlet side of the baffle;

P ₂ : pressure in the separator chamber;

S: the area of the baffle;

A: The cross-sectional area of the inlet section of the liquid phase outlet;

h: the height of the liquid level in the ring cavity of the core cylinder and the outer cylinder;

When the liquid level h is low, F ₁ ≥ F ₂ , the baffle 14 is stationary, the liquid phase outlet 12 is closed, and the liquid level gradually increases. When the liquid level increases to a certain height, F ₁ <F ₂ , the spring 13 shrinks, the baffle 14 moves, and the liquid in the core cylinder 1 and the outer cylinder 10 flows out from the liquid phase outlet 12. When F1 ₌ F2, the baffle ₁₄ reaches the equilibrium position, and the flow rate of the liquid phase outlet 12 is stable. For liquids with different physical properties and flow rates, the compression degree of the spring 13 is different, the gap between the baffle 14 and the wall of the liquid phase outlet 12 changes, and the discharge flow rate of the liquid phase outlet 12 is also adjusted accordingly.

In the subsequent process, the separation process in the separator 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 flow pattern of the gas-liquid mixture before entering the separator is relatively stable, and there is no oscillation phenomenon. Therefore, when the gas-liquid mixture leaves the core barrel 1 and enters the gravity separation chamber 11, the flow is relatively stable, and there is no obvious oscillation phenomenon. After leaving the core cylinder 1, the gas-liquid mixture enters the gravity separation chamber 11, and the remaining liquid in the annular liquid film is thrown around along the inner wall of the core cylinder 1 under the action of centrifugal force, while the gas phase continues to move upward, separated by The gas phase outlet 8 leaves the separator, and the liquid entering the gravity separation chamber 11 flows into the annular cavity between the outer cylinder 10 and the core cylinder 1 . When the liquid level h is low, F ₁ ≥ F ₂ , the baffle 14 is stationary, no fluid is discharged from the liquid phase outlet 12 , the liquid converges at the bottom ends of the core cylinder 1 and the outer cylinder 10 , the core cylinder 1 and the outer cylinder 10 The liquid level in the chamber gradually rises, and the small bubbles carried in the liquid aggregate in the liquid, rise to the liquid surface under the action of buoyancy, re-enter the gravity separation chamber 11, and discharge from the gas phase outlet 8 of the separator. With the continuous rise of the liquid level, the bubbles cannot reach the inlet position of the liquid phase outlet 12 under the action of buoyancy and drag force. There are no visible bubbles in the liquid at the bottom of the cavity of the core cylinder 1 and the outer cylinder 10. When the liquid level increases to a certain level When the height is F ₁ < F ₂ , the baffle plate 14 moves, the liquid phase is discharged from the liquid phase outlet 12 of the separator, and the liquid floats from the air bubbles carried to the liquid surface, and enters the gravity separation chamber 11 again, and is introduced into the gas phase by the separator. Outlet 8 is discharged. When the flow rate of the liquid phase outlet 12 is F ₁ =F ₂ , the baffle plate 14 reaches the equilibrium position, and the liquid level is also kept stable, finally realizing the separation process of the separator under low gas content.

Under the condition of high gas content, on the one hand, the gas-liquid mixture may present an unstable flow pattern, that is, the gas-liquid mixture will oscillate violently before entering the separator, and this oscillation will continue to be transmitted downstream after entering the separator, causing separation Violent oscillation occurs in the device; on the other hand, under high gas content, the gas flow velocity is high, and part of the liquid will move with the gas phase under the action of the gas phase. Affected by the flow pattern oscillation and the entrainment of the gas phase, after the gas-liquid mixture leaves the core barrel 1 , it is directly sprayed into the gravity separation chamber 11 . Under the influence of gravity, part of the liquid directly falls back into the annular cavity between the core cylinder 1 and the outer cylinder 10 . Part of the liquid will reach the top of the separator barrel 10 due to oscillation and gas carryover. The water baffle 6 can be separated by collision, blocking most of the liquid reaching the top of the separator, preventing it from directly entering the gas phase outlet 8 of the separator, thereby reducing the separation efficiency. A small amount of liquid carried by the gas will reach the top cover of the separation outer cylinder 10. The inward extension of the gas phase outlet 8 of the separator can prevent the liquid from entering the gas phase outlet 8 of the separator due to the entrainment of the gas phase, thereby reducing the separation efficiency. Under the separation action of the water baffle 6 and the inwardly extending part of the gas phase outlet 8 of the separator, after the separated liquid enters the gravity separation chamber 11, it continues to fall back into the annular cavity between the inner cylinder 1 and the outer cylinder 10, The liquid entering the gravity separation chamber 11 flows into the annular cavity between the outer cylinder 10 and the core cylinder 1 . When the liquid level h is low, F ₁ ≥ F ₂ , the baffle 14 is stationary, no fluid is discharged from the liquid phase outlet 12 , the liquid converges at the bottom ends of the core cylinder 1 and the outer cylinder 10 , the core cylinder 1 and the outer cylinder 10 The liquid level in the chamber gradually rises, and the small bubbles carried in the liquid aggregate in the liquid, rise to the liquid surface under the action of buoyancy, re-enter the gravity separation chamber 11, and discharge from the gas phase outlet 8 of the separator. With the continuous rise of the liquid level, the bubbles cannot reach the inlet position of the liquid phase outlet 12 under the action of buoyancy and drag force. There are no visible bubbles in the liquid at the bottom of the cavity of the core cylinder 1 and the outer cylinder 10. When the liquid level increases to a certain level When the height is F ₁ < F ₂ , the baffle plate 14 moves, the liquid in the chamber of the core cylinder 1 and the outer cylinder 10 is discharged from the liquid phase outlet 12 , the liquid phase is discharged from the liquid phase outlet 12 of the separator, and the liquid is discharged from the air bubbles carried by it. When the liquid surface emerges, it enters the gravity separation chamber 11 again, and is discharged through the gas phase outlet 8 of the separator. When the flow rate of the liquid phase outlet 12 is F ₁ =F ₂ , the baffle plate 14 reaches the equilibrium position, and the liquid level is also kept stable, finally realizing the separation process of the separator under high gas content.

When the liquid flow rate at the inlet of the core cylinder 1 increases, the liquid falling into the chambers of the core cylinder 1 and the outer cylinder 10 increases, the length of the spring decreases, the gap between the baffle 14 and the liquid phase outlet 12 increases, and the liquid phase outlet 12 The discharge flow also increases. When the baffle 14 contacts the positioning pipe 15, the spring is no longer compressed, and the discharge flow rate of the liquid phase outlet reaches the maximum. When the inlet flow rate of the inner cylinder 1 decreases, the gap between the baffle 14 and the wall of the liquid phase outlet 12 decreases, and the discharge flow rate of the liquid phase outlet 12 decreases. During this process, the liquid level in the cavity of the core cylinder 1 and the outer cylinder 10 does not vary widely, and there will be no separation due to the excessively low liquid level when the bubbles are discharged from the liquid phase outlet 12 or the liquid level is too high to flood the liquid discharge section 4. The efficiency is reduced, and the liquid level adaptation under different flow ranges is realized.

Embodiment 2: Combined with FIG. 5, on the basis of Embodiment 1, the structure of the separator is appropriately adjusted, and the impeller 3 is adjusted into a primary impeller 23 and a secondary impeller 16, and the primary impeller 23 is installed in the core tube 1. The upper part of the barrel 1 is provided with a liquid discharge section 4, and the outlet of the core barrel 1 is provided with a secondary impeller 16. In conjunction with accompanying drawing 5, the embodiment is described in further detail:

5, a spring-type liquid level adaptive gas-liquid separator provided by the present invention includes: a core tube 1, an inlet flange 2, a first-stage impeller 23, a liquid discharge section 4, an anti-vibration strip 5, and a water baffle 6. Connecting rod 7, separator gas phase outlet 8, outlet flange 9, outer cylinder 10, gravity separation chamber 11, liquid phase outlet 12, spring 13, baffle 14, positioning pipe 15, secondary impeller 16.

During gas-liquid separation, the technical solution is: the entire separator is fixedly installed through the inlet flange 2 and the outlet flange 9 . During the operation of the separator, the gas-liquid mixture first enters the gas-liquid separator device through the inlet of the core tube 1, and then flows through the impeller 23 from normal linear motion to rotational motion, generating rotational motion and centrifugal force at the same time. Under the action of centrifugal force, the gas phase with lower density accumulates in the center of the core cylinder 1 to form a gas core; the liquid phase with higher density accumulates on the wall surface of the core cylinder 1 and forms an annular liquid film to achieve phase separation. After passing through the impeller 23 , the gas-liquid mixture continues to move upward in the core cylinder 1 , and when passing through the liquid discharge section 4 , part of the liquid phase in the annular liquid film enters the core cylinder 1 and the outer cylinder through the opening of the liquid discharge section 4 10 in the annular cavity. Due to frictional dissipation and other effects, the centrifugal force of the fluid will be weakened to a certain extent. After passing through the discharge section 4, the gas-liquid two phases continue to move upward. For the baffle 14 at the sudden expansion of the liquid phase outlet 12, the force on the outlet side of the liquid phase outlet is F ₁ , and the force at the inlet of the liquid phase outlet is F ₂ :

F ₁ =F _k +P ₁ A (2-1)

F ₂ =(P ₂ +ρgh)S (2-2)

where:

F _k : the elastic force of the spring to the baffle;

P ₁ : pressure on the liquid phase outlet side of the baffle;

P ₂ : pressure in the separator chamber;

S: the area of the baffle;

A: The cross-sectional area of the inlet section of the liquid phase outlet;

h: the height of the liquid level in the ring cavity of the core cylinder and the outer cylinder;

When the liquid level h is low, F ₁ ≥ F ₂ , the baffle 14 is stationary, the liquid phase outlet 12 is closed, and the liquid level gradually increases. When the liquid level increases to a certain height, F ₁ <F ₂ , the spring 13 shrinks, the baffle 14 moves, and the liquid in the core cylinder 1 and the outer cylinder 10 flows out from the liquid phase outlet 12. When F1 ₌ F2, the baffle ₁₄ reaches the equilibrium position, and the flow rate of the liquid phase outlet 12 is stable. For liquids with different physical properties and flow rates, the compression degree of the spring 13 is different, the gap between the baffle 14 and the wall of the liquid phase outlet 12 changes, and the discharge flow rate of the liquid phase outlet 12 is also adjusted accordingly.

The latter phenomenon differs between high and low gas content conditions and is 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 mesoporous channel established by the hub of the secondary impeller 16 and enter the gravity separation chamber 11. After leaving the separator, the liquid phase falls back into the annular cavity between the core tube 1 and the outer tube 10 under the action of gravity. After the liquid phase and a small amount of gas phase pass through the channels between the impellers, the centrifugal force is further enhanced. After leaving the blades of the secondary impeller 16, under the action of centrifugal force, the denser liquid phase is thrown off the inner wall surface of the outer cylinder 10, and falls back into the annular cavity between the core cylinder 1 and the outer cylinder 10 by gravity, and the gas phase Then it moves upward and leaves the separator through the gravity separation chamber 11 and the separator gas phase outlet 8 respectively, and the liquid entering the gravity separation chamber 11 flows into the annular cavity between the outer cylinder 10 and the core cylinder 1 . When the liquid level h is low, F ₁ ≥ F ₂ , the baffle 14 is stationary, no fluid is discharged from the liquid phase outlet 12 , the liquid converges at the bottom ends of the core cylinder 1 and the outer cylinder 10 , the core cylinder 1 and the outer cylinder 10 The liquid level in the chamber gradually rises, and the small bubbles carried in the liquid aggregate in the liquid, rise to the liquid surface under the action of buoyancy, re-enter the gravity separation chamber 11, and discharge from the gas phase outlet 8 of the separator. With the continuous rise of the liquid level, the bubbles cannot reach the inlet position of the liquid phase outlet 12 under the action of buoyancy and drag force. There are no visible bubbles in the liquid at the bottom of the cavity of the core cylinder 1 and the outer cylinder 10. When the liquid level increases to a certain level When the height is F ₁ < F ₂ , the baffle plate 14 moves, the liquid in the chamber of the core cylinder 1 and the outer cylinder 10 is discharged from the liquid phase outlet 12 , the liquid phase is discharged from the liquid phase outlet 12 of the separator, and the liquid is discharged from the air bubbles carried by it. When the liquid surface emerges, it enters the gravity separation chamber 11 again, and is discharged through the gas phase outlet 8 of the separator. When the flow rate of the liquid phase outlet 12 is F ₁ =F ₂ , the baffle plate 14 reaches the equilibrium position, and the liquid level is also kept stable, finally realizing the separation process of the separator under low gas content.

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 a stirred flow or an annular flow condition. The annular liquid film formed after passing through the impeller 23 and a small amount of gas enter the channel between the blades of the secondary impeller 16, and the centrifugal force is further enhanced. After leaving the blades of the secondary impeller 16, the liquid phase is thrown to the inner wall of the outer cylinder 10 of the separator under the action of centrifugal force. Under the influence of gas entrainment and flow pattern oscillation, the liquid phase continues to move upward along the inner wall of the outer cylinder 10, and part of the liquid phase moves upward along the inner wall of the outer cylinder 10. The liquid phase will move to the gas phase outlet 8 of the separator, and part of the liquid phase will fall back into the annular cavity between the outer cylinder 10 and the core cylinder 1 on the way. Due to the blocking effect of the inwardly extending portion of the separator's gas-phase outlet 8, the liquid reaching the separator's gas-phase outlet 8 will not enter the separator's gas-phase outlet 8 due to the influence of gas entrainment, thereby affecting the separation efficiency. Part of the liquid finally falls back and enters the annular cavity between the outer cylinder 10 and the core cylinder 1 . The gas core and a small amount of liquid phase formed after passing through the impeller 23 enter the circulation channel established by the hollow hub of the secondary impeller 16, and then enter the gravity separation chamber 11. The impact height in 11 is higher. Among them, the droplets with larger diameters fall back into the annular cavity between the outer cylinder 10 and the core cylinder 1 under the action of gravity; the droplets with smaller diameters move upward under the action of the gas phase, and pass through the separation baffle 6. As a result, the small droplets carried in the gas phase are separated, and the gas phase leaves the separator through the gas phase outlet 8 of the separator. The falling liquid flows into the annular cavity between the outer cylinder 10 and the core cylinder 1 , and the liquid entering the gravity separation chamber 11 flows into the annular cavity between the outer cylinder 10 and the core cylinder 1 . When the liquid level h is low, F ₁ ≥ F ₂ , the baffle 14 is stationary, no fluid is discharged from the liquid phase outlet 12 , the liquid converges at the bottom ends of the core cylinder 1 and the outer cylinder 10 , the core cylinder 1 and the outer cylinder 10 The liquid level in the chamber gradually rises, and the small bubbles carried in the liquid aggregate in the liquid, rise to the liquid surface under the action of buoyancy, re-enter the gravity separation chamber 11, and discharge from the gas phase outlet 8 of the separator. With the continuous rise of the liquid level, the bubbles cannot reach the inlet position of the liquid phase outlet 12 under the action of buoyancy and drag force. There are no visible bubbles in the liquid at the bottom of the cavity of the core cylinder 1 and the outer cylinder 10. When the liquid level increases to a certain level When the height is F ₁ < F ₂ , the baffle plate 14 moves, the liquid in the chamber of the core cylinder 1 and the outer cylinder 10 is discharged from the liquid phase outlet 12 , the liquid phase is discharged from the liquid phase outlet 12 of the separator, and the liquid is discharged from the air bubbles carried by it. When the liquid surface emerges, it enters the gravity separation chamber 11 again, and is discharged through the gas phase outlet 8 of the separator. When the flow rate of the liquid phase outlet 12 is F ₁ =F ₂ , the baffle plate 14 reaches the equilibrium position, and the liquid level remains stable, realizing the separation process of the separator under high gas content. During the separation process, due to the vibration of the gas-liquid mixture, the inner cylinder 1 of the separator will oscillate accordingly. The arrangement of the anti-vibration strips 5 can fix the inner cylinder 1 and avoid fatigue damage to the structure of the separator due to long-term vibration.

When the liquid flow rate at the inlet of the core cylinder 1 increases, the liquid falling into the chambers of the core cylinder 1 and the outer cylinder 10 increases, the length of the spring decreases, the gap between the baffle 14 and the liquid phase outlet 12 increases, and the liquid phase outlet 12 The discharge flow also increases. When the baffle 14 contacts the positioning pipe 15, the spring is no longer compressed, and the discharge flow rate of the liquid phase outlet reaches the maximum. When the inlet flow rate of the inner cylinder 1 decreases, the gap between the baffle 14 and the wall of the liquid phase outlet 12 decreases, and the discharge flow rate of the liquid phase outlet 12 decreases. During this process, the liquid level in the chambers of the core cylinder 1 and the outer cylinder 10 does not change much, and there will be no separation due to the excessively low liquid level of bubbles being discharged from the liquid phase outlet 12 or the over-high liquid level submerging the liquid discharge section 4. The efficiency is reduced, and the liquid level adaptation under different flow ranges is realized.

Claims (10)

1. A spring type liquid level self-adaptive gas-liquid separator is characterized in that: comprises an outer barrel and a core barrel, wherein the upper part of the core barrel extends into the outer barrel, the lower part of the core barrel extends out of the bottom of the outer barrel, an impeller is arranged in the core barrel, a liquid drainage section is arranged at the upper part of the core barrel, a gas phase lead-out opening is arranged at the top of the outer barrel, a water baffle is arranged below the gas phase lead-out opening of the separator, the water baffle is connected with the top of the outer barrel through a connecting rod, a liquid phase lead-out opening is arranged at the lower part of the outer, the liquid phase outlet comprises an inlet pipe, a sudden expansion pipe and an outlet pipe which are sequentially communicated, the inlet pipe is connected with the outer barrel and is communicated with the inside of the outer barrel, the width of the sudden expansion pipe is larger than that of the inlet pipe and the outlet pipe, a baffle is arranged at the joint of the sudden expansion pipe and the inlet pipe, a positioning pipe is arranged at the joint of the sudden expansion pipe and the outlet pipe, a spring is installed on the baffle, the other end of the spring is positioned in the positioning pipe, an inlet flange is installed outside the bottom of the core barrel, and an outlet flange is installed at.

2. The spring type liquid level self-adaptive gas-liquid separator according to claim 1, characterized in that: the included angle between the tangent line of the outlet end of the core barrel and the central axis of the inner barrel is 60 degrees.

3. The spring type liquid level self-adaptive gas-liquid separator according to claim 1, characterized in that: a development section which is 4-10 times of the inner diameter of the core barrel is reserved between the liquid discharge section and the upper edge of the impeller blade.

4. The spring type liquid level self-adaptive gas-liquid separator according to claim 1, characterized in that: and a shockproof strip is arranged between the core barrel and the outer barrel and is arranged at the height of the lower edge of the blade of the impeller.

5. A spring type liquid level self-adaptive gas-liquid separator is characterized in that: the device comprises an outer barrel and a core barrel, wherein the upper part of the core barrel extends into the outer barrel, the lower part of the core barrel extends out of the bottom of the outer barrel, a primary impeller is arranged in the core barrel, a liquid drainage section is arranged at the upper part of the core barrel, a secondary impeller is arranged at an outlet of the core barrel, a gas phase lead-out port is arranged at the top of the outer barrel, a water baffle is arranged below the gas phase lead-out port of a separator, the water baffle is connected with the top of the outer barrel through a connecting rod, a liquid phase lead-out port is arranged at the lower part of the outer barrel, the liquid phase lead-out port comprises an inlet pipe, a sudden expansion pipe and an outlet pipe which are sequentially communicated, the inlet pipe is connected with the outer barrel and communicated with the inside of the outer barrel, the width of the sudden expansion pipe is larger than that of the inlet pipe and the outlet pipe, a baffle is arranged at, and an outlet flange is arranged at the top of the gas phase outlet.

6. A spring type liquid level self-adaptive gas-liquid separator according to any one of claims 1-5, characterized in that: a space is reserved between the outlet of the core barrel and the water baffle plate, so that a gravity separation chamber is formed at the upper part of the outer barrel.

7. A spring type liquid level self-adaptive gas-liquid separator according to any one of claims 1-5, characterized in that: the outer diameter of the water baffle is larger than the inner diameters of the gas phase lead-out opening and the core barrel.

8. A spring type liquid level self-adaptive gas-liquid separator according to any one of claims 1-5, characterized in that: the separator gas phase outlet extends towards the inside of the separator outer cylinder.

9. The spring type liquid level self-adaptive gas-liquid separator according to claims 1-5, characterized in that: the inner diameter of the baffle is larger than the inner diameter of the inlet pipe and smaller than the inner diameter of the sudden expansion pipe; the length of the positioning tube is larger than that of the spring when the spring is compressed.

10. The spring type liquid level self-adaptive gas-liquid separator according to claim 5, characterized in that: and a shockproof strip is arranged between the core barrel and the outer barrel and is arranged between the primary impeller and the liquid discharge section.

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