Horizontal gravity circulation gas-liquid separator

Abstract

The application provides a horizontal gravity circulation gas-liquid separator, which is characterized by comprising a separation tank with a support, a gas flow inlet being arranged in the left part of the separation tank, a gas flow pipe being connected to the gas flow inlet, a reduced diameter part being arranged at the end of the gas flow pipe, a separation assembly being fixed in the separation tank, the separation assembly comprising a vertical plate and a horizontal plate being fixed at the bottom of the vertical plate, a drainage port being arranged on the vertical plate and corresponding to the position of the gas flow pipe, a gas outlet being arranged at the right part of the top of the separation tank, a mist catcher being arranged below the gas outlet, and a liquid discharge port being arranged at the bottom of the separation tank. The gas-liquid separator has a simple structure and can quickly separate gas and liquid in the mined natural gas and shale gas, and part of the gas can be separated multiple times, so that the deposited foam is accumulated to one side of the separator, and the foam is broken by impact, and then gathered into liquid drops and deposited in the liquid collection area.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of gas-liquid separation, and particularly relates to a horizontal gravity circulation gas-liquid separator. BACKGROUND

[0002] Natural gas as clean energy, the demand for exploration and development is increasing. Drilling and production process brings a variety of high molecular organic compounds, which has strong foaming property. The use of various agents leads to the increasing complexity of solid-liquid impurities carried in raw natural gas.

[0003] The gravity separator as a primary separation device is widely used in various mining stations, so its separation effect has a great influence on the subsequent pipeline and process system, and the separation effect of the separator is closely related to its specific structure principle.

[0004] The gravity separator is usually divided into primary separation zone, secondary separation zone, liquid collection zone and mist catcher zone according to function division.

[0005] The role of the primary separation zone is to remove most of the liquid in the inlet fluid, and the liquid flow and large droplets are removed first to reduce gas turbulence and droplet entrainment, and to prepare for secondary separation. In order to achieve this function, the kinetic energy of the fluid or the flow direction of the fluid needs to be absorbed or changed through some form of inlet baffle.

[0006] The main role of the secondary separation zone is to separate the liquid from the gas flow by gravity after the flow rate of the fluid is slowed down. The separation efficiency of this zone depends on the properties of gas and liquid, droplet size and degree of turbulence of gas. In the design, built-in baffle can be used to reduce turbulence and eliminate foam, and the baffle can also serve as a droplet catcher.

[0007] The liquid collection zone is used for liquid collection, and the disturbance of the gas flow to this zone should be minimized. This zone should have sufficient volume to ensure the buffering function, and should provide sufficient buffering time to ensure the degassing of liquid and the removal of free water.

[0008] The design of the mist catcher in the mist catcher zone can use a series of blades, steel wire mesh fillers or centrifugal elements.

[0009] Practice has proved that strong foaming liquid will produce a large amount of foam under the strong agitation of gas flow, pipeline elements and the primary separation zone of the separator, which will accumulate on the interface between the secondary separation zone and the liquid accumulation zone, and be easily entrained by the gas flow. Therefore, the ordinary gravity separator has poor separation effect for strong foaming liquid. SUMMARY

[0010] In view of the deficiencies in the prior art, the application provides a horizontal gravity circulation gas-liquid separator, which has simple structure and can quickly separate gas and liquid in mined natural gas and shale gas, and part of the gas can be separated multiple times to accumulate the deposited foam to one side of the separator, so that the foam is broken by impact, and then gathered into liquid drops and deposited in a liquid collecting area.

[0011] To achieve the above object, the application adopts the following technical scheme: a horizontal gravity circulation gas-liquid separator, comprising a separation tank with a support, a gas flow inlet in a left region of the separation tank, a gas flow pipe connected to the gas flow inlet, a reduced diameter portion in a terminal region of the gas flow pipe, a separation assembly fixed in the separation tank, the separation assembly comprising a vertical plate, a horizontal plate fixed to the bottom of the vertical plate, a drainage port in the vertical plate, the drainage port corresponding to the position of the gas flow pipe, a gas outlet in a right region of the top of the separation tank, a mist catcher installed below the gas outlet, and a liquid discharge port in the bottom of the separation tank.

[0012] Further, a drainage pipe is installed in the drainage port of the vertical plate, and the opening of the drainage pipe is a circular arc flared opening with a radius of 10-30 mm.

[0013] Further, a kinetic energy elimination device is fixed to the right of the drainage pipe of the separation tank.

[0014] Further, the kinetic energy elimination device adopts a butterfly head, and the angle between the center line of the butterfly head and the horizontal line is 0-20 degrees.

[0015] Further, the horizontal plate is also inclined at an angle of 10-20 degrees.

[0016] Further, the height of the vertical plate is half of the height of the inner cavity of the separation tank.

[0017] Further, the reduced diameter portion of the gas flow pipe extends into the drainage pipe, and the overlapping distance between the two is 25 mm or more.

[0018] Further, the length of the drainage pipe is 2-3 times the diameter of the terminal end of the reduced diameter portion of the gas flow pipe.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] First, the gas-liquid separator has a simple structure. Through multiple circulations of gas in the separation tank, it can quickly separate the gas and liquid phases in the extracted shale gas and natural gas. At the same time, during the flow of gas, it can cause the foam in the liquid collection area to move to one side, causing the foam to collide and break, further releasing the shale gas in the foam and improving the separation effect of shale gas and natural gas.

[0021] Second, by installing a drainage pipe in the drainage port of the vertical plate, and having a reduced diameter section at the end of the drainage pipe, the gas flow rate can be increased. The size of the reduced diameter section at the end of the airflow pipe is used to set the airflow speed. At the same time, the drainage pipe ensures that the gas directly enters the space separated by the separator, so that part of it enters the mist eliminator to separate the liquid, and the other part is recirculated and separated again.

[0022] Third, by tilting the horizontal plate at an angle, the liquid deposited on the horizontal plate can flow to the right under the action of gravity, and finally flow into the liquid collection area. Attached Figure Description

[0023] Fig. 1 This is a schematic diagram of the structure of the present invention;

[0024] Fig. 2 This is a schematic diagram of the structure of the separator component of the present invention;

[0025] In the diagram: 1. Separator; 2. Airflow inlet; 3. Airflow pipe; 4. Reduction section; 5. Vertical plate; 6. Horizontal plate; 7. Drainage port; 8. Gas outlet; 9. Mist eliminator; 10. Drainage port; 11. Drainage pipe; 12. Flaring; 13. Butterfly end cap; 14. Foam; Detailed Implementation

[0026] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figs. 1-2 As shown, the present invention proposes a horizontal gravity circulation gas-liquid separator, including a separation tank 1 with a support. The left side of the separation tank 1 has an airflow inlet 2, and an airflow pipe 3 is connected to the airflow inlet 2. The end of the airflow pipe 3 has a narrowed section 4. A separation assembly is also fixed in the separation tank. The separation assembly includes a vertical plate 5, and a horizontal plate 6 is fixed at the bottom of the vertical plate 5. The vertical plate 5 has a drain port, and the drain port is positioned corresponding to the airflow pipe 3. The right side of the top of the separation tank 1 has a gas outlet 8, and a mist eliminator 9 is installed below the gas outlet 8. A liquid drain port 10 is also provided at the bottom of the separation tank 1.

[0028] The present application is used in the process as follows, the need to separate shale gas, natural gas from the gas flow inlet 2 into, because the gas flow inlet 2 is fixedly connected with a gas flow pipe 3, and the gas flow pipe 3 has a reduced diameter portion 4 at the end, so the flow rate of the gas flow is greatly accelerated at the reduced diameter portion 4 due to the smaller flow area, which will produce low pressure (i.e. Venturi effect) near it, thereby attracting the surrounding gas to flow forward, the gas flow passes through the flow guide hole on the vertical plate 5 in the process of flowing forward, because the position of the flow guide hole and the gas flow pipe 3 corresponds, the gas flowing out of the gas flow pipe 3 can directly enter the flow guide hole and continue to flow forward, in the process of flowing, the liquid droplets or foam 14 with greater gravity in the gas will fall on the horizontal plate 6 of the separation assembly and flow into the liquid collection area at the bottom of the separation tank from the horizontal plate, wherein the foam 14 will float on the liquid surface of the liquid collection area, on the other hand, the gas continues to move forward, at this time a part of the gas will be discharged towards the gas outlet 8 through the mist catcher 9 (the mist catcher can adopt a wire mesh mist catcher, which is a prior structure and can be directly purchased on the market), due to the Venturi effect near the gas flow pipe, another part of the gas which has not been discharged from the gas outlet 8 will bypass the horizontal plate 6 of the separation assembly, circulate again in the separation tank 1 and enter again into the area separated by the separation plate through the flow guide hole, in this process, the part of the gas flowing again will blow the foam 14 floating in the liquid collection area to the left side, so that it gradually accumulates to the left side, in the process of moving of the foam 14, the foam 14 is extruded between the foam 14, which will cause a large amount of foam 14 to break into liquid droplets and fall again into the liquid collection area, part of the foam 14 hits the gas flow pipe and also breaks into liquid droplets and falls into the liquid collection area, after the foam 14 breaks, the gas in the foam 14 will be released, so that the gas is not wasted, in this way, through the multiple circulation of the gas and the extrusion of the foam 14, the foam 14 in the liquid collection area is more thoroughly removed, and the gas in the foam 14 is more fully released, which effectively improves the cleaning effect of the gas.

[0029] Further, the flow guide hole on the vertical plate 5 is provided with a flow guide pipe 11, and the opening of the flow guide pipe 11 is an expanded opening 12. Specifically, the flow guide pipe 11 of the separator forms an expanded opening 12, through the setting of the expanded opening 12, the gas entering from the gas flow pipe 3 can completely enter the flow guide hole to complete the circulation.

[0030] Further, the separation tank 1 is fixed with a kinetic energy elimination device on the right side of the flow guide pipe 11, the kinetic energy elimination device adopts a butterfly head, and the angle between the center line of the butterfly head and the horizontal line is 0-20 degrees. Specifically, the separation tank 1 of the present application is further fixed with a kinetic energy elimination device, specifically, the kinetic energy elimination device can adopt a butterfly head 13, the butterfly head 13 is inclined by 15 degrees, through the setting of the head, the gas flow can directly impact on the head, so as to slow down the flow speed, after the flow speed is reduced, part of the liquid mixed therein will be deposited on the horizontal plate 6 under the action of gravity, and the gas will flow forward, part of the gas passes through the mist collector 9, the liquid in the mist collector 9 is captured, the liquid is collected from larger droplets, and finally falls into the bottom of the separation tank 1, and the gas which does not enter the wire mesh mist collector 9 is recycled through the Venturi effect again, so as to ensure that most of the gas entering the separator experiences multiple cycle separation, so that the liquid in the gas is more thoroughly removed.

[0031] Further, by also inclining the horizontal plate 6 by a certain angle, the liquid droplets deposited on the horizontal plate 6 can flow forward. Specifically, the angle is set to 15 to 20 degrees.

[0032] Further, the height of the vertical plate 5 is half of the height of the inner cavity of the separation tank 1. By setting the height of the vertical plate 5 to be half of the height of the inner cavity of the separation tank 1, the gas has more space for circulation.

[0033] Further, the reduced diameter part of the gas flow pipe extends into the flow guide pipe, and the overlapping distance is 25 mm or more. By extending the reduced diameter part of the gas flow pipe into the flow guide pipe and overlapping, the gap between the gas flow pipe and the flow guide pipe is smaller, and some smaller volume foam 14 can also be better extruded to break and release the gas therein.

[0034] Further, the length of the flow guide pipe is 2-3 times the diameter of the reduced diameter end of the gas flow pipe. If the length of the flow guide pipe is too short, the direction of the gas participating in circulation cannot be completely guided by the flow guide pipe before flowing out of the flow guide pipe, so that it cannot impact the kinetic energy elimination device to slow down. If the length of the flow guide pipe is too long, the volume of the separator will be increased. It is found through practice that the length of the flow guide pipe is preferably set to be 2-3 times the diameter of the reduced diameter end of the gas flow pipe.

[0035] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A horizontal gravity-circulating gas-liquid separator, characterized in that: The device includes a separator with a support. The left side of the separator has an airflow inlet, through which an airflow pipe is connected. The end of the airflow pipe has a reduced diameter section. A separator assembly is also fixed inside the separator. The separator assembly includes a vertical plate with a horizontal plate fixed to its bottom. The vertical plate has a drain port, which corresponds to the position of the airflow pipe. The right side of the top of the separator has a gas outlet, below which a mist eliminator is installed. A drain port is also provided at the bottom of the separator.

2. A horizontal gravity circulation gas-liquid separator according to claim 1, characterized in that: A drainage tube is installed in the drainage port on the vertical plate. The opening of the drainage tube is an arc-shaped flared opening with a radius of 10-30mm.

3. A horizontal gravity circulation gas-liquid separator according to claim 2, characterized in that: The separator has a kinetic energy elimination device fixed on the right side of the drain pipe.

4. A horizontal gravity circulation gas-liquid separator according to claim 3, characterized in that: The kinetic energy elimination device adopts a butterfly-shaped head, and the angle between the center line of the butterfly-shaped head and the horizontal line is 0-20 degrees.

5. A horizontal gravity circulation gas-liquid separator according to claim 4, characterized in that: The horizontal plate is also tilted at an angle of 10-20 degrees.

6. A horizontal gravity circulation gas-liquid separator according to claim 5, characterized in that: The height of the vertical plate is half the height of the inner cavity of the separation tank.

7. A horizontal gravity circulation gas-liquid separator according to claim 6, characterized in that: The reduced diameter section of the airflow pipe extends into the drainage pipe, with an overlap distance of more than 25 mm between the two.

8. A horizontal gravity circulation gas-liquid separator according to claim 7, characterized in that: The length of the drainage tube is 2-3 times the diameter of the end of the narrowed section of the airflow tube.

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