Gas-liquid separation device for natural gas production

Abstract

The utility model relates to the technical field of natural gas production, in particular to a gas-liquid separation device for natural gas production, and aims to solve the technical problem that part of small liquid drops are difficult to settle to the bottom of a separator within limited retention time and are discharged along with gas, so that the separation effect is poor. Comprising a separation tank, a liquid injection pipe, a flow guide pipe, an input shaft, a liquid discharge port, centrifugal blades, an exhaust pipe and a liquid discharge mechanism, gas-liquid mixed natural gas is discharged through the bottom of the flow guide pipe, liquid enters the bottom of the separation tank, gas carries small liquid drops to rise, under the centrifugal action of the centrifugal blades, the small liquid drops are centrifugally thrown to the inner wall of the separation tank and converge downwards, and the gas rises and is discharged through the exhaust pipe. The gas advances from bottom to top, so that the retention time of the gas in the separation tank is prolonged, the gas is in full contact with the centrifugal blades, and the separation effect is very good.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas production technical field, and the specific field is a gas liquid separation device for natural gas production. BACKGROUND

[0002] With the development of global economy, the demand for clean energy is increasing, and natural gas as a kind of efficient and clean fossil energy is becoming more and more important in energy structure. In the process of natural gas exploitation and production, the natural gas mined from the ground is usually accompanied by various liquids, such as crude oil, condensate oil, formation water and some impurities, etc. For example, in the exploitation of some offshore natural gas fields and deep land gas fields, the liquid content in the produced natural gas is high, and the composition is complex. If gas-liquid separation is not carried out, these liquids will enter the subsequent pipeline, compressor, valve and other equipment, which will cause corrosion, wear and other damage to the equipment, and reduce the service life and operating efficiency of the equipment. For example, the moisture in the liquid will form an acidic solution with the acidic gas in the natural gas, accelerating the corrosion of the pipeline and equipment; and the high-speed impact of liquid droplets will wear the impeller and other components of the compressor.

[0003] The prior art utilizes the density difference between gas and liquid, and under the action of gravity field, the liquid in the gas-liquid mixture naturally settles at the bottom of the separator, and the gas flows upward to the top of the separator, thereby realizing gas-liquid separation.

[0004] However, for small liquid droplets, the gravity acting on them is relatively small, and the settling speed in the gas is slow. At the same time, the gas flow may produce disturbance, which interferes with the settling of small liquid droplets, causing part of the small liquid droplets to be difficult to settle to the bottom of the separator within a limited residence time, and thus to be discharged together with the gas, resulting in unsatisfactory separation effect. TECHNICAL CONTENT

[0005] The utility model discloses a kind of gas-liquid separation devices for natural gas production to solve the technical problem that part of small liquid droplets is difficult to settle to the bottom of the separator within a limited residence time, and thus to be discharged together with the gas, resulting in poor separation effect, and further provides a kind of gas-liquid separation device for natural gas production.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a kind of gas-liquid separation device for natural gas production, comprising: separation tank, separation tank is vertically arranged and top wall is communicated with liquid injection pipe, liquid injection pipe lower end is rotatably connected and is communicated with flow guide pipe, flow guide pipe extends to the lower part of separation tank and lower end is connected with input shaft, input shaft is rotatably connected to the bottom wall of separation tank, the lower end of flow guide pipe is provided with liquid discharge port, the outer surface of flow guide pipe is circumferentially distributed with centrifugal vane, the inner wall of separation tank in the upper part of flow guide pipe is connected and is communicated with exhaust pipe, the bottom wall of separation tank is connected with liquid discharge mechanism, and liquid discharge mechanism can discharge the liquid at the bottom of separation tank.

[0007] Preferably, the draining mechanism includes a drain pipe, and the liquid pump contacts the bottom wall of the separator through the drain pipe. Two liquid level sensors at different heights are provided on the lower inner wall of the separator. The liquid level sensors can send liquid level signals to the controller, and the controller can control the flow rate of the liquid pump according to the liquid level signals.

[0008] Preferably, multiple guide rods are evenly distributed around the inner wall of the separator, and each guide rod has a fan-shaped cross-section with the arc surface of the fan in contact with the inner wall of the separator.

[0009] Preferably, a drainage plate is connected to the outer surface of the drainage rod, and the drainage plate is inclined from top to bottom and points to the gap between adjacent drainage rods.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The gas-liquid mixture of natural gas is discharged through the bottom of the guide pipe, the liquid enters the bottom of the separator, the gas carries small liquid droplets upward, and under the centrifugal action of the centrifugal blades, the small liquid droplets are centrifuged and thrown to the inner wall of the separator and flow downward, while the gas rises and is discharged through the exhaust pipe. The gas travels from bottom to top, which prolongs the residence time in the separator and ensures full contact with the centrifugal blades, resulting in a very good separation effect.

[0012] The small droplets from centrifugation are guided along the inclined surface of the guide rod and quickly flow down between the two guide rods. The droplets adhering to the guide rods on the auxiliary part of the guide plate flow down quickly, avoiding the unflowed droplets being carried away by the rising airflow. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0016] In the diagram: 1. Separator tank; 2. Injection pipe; 3. Guide pipe; 4. Input shaft; 5. Drain port; 6. Centrifugal blade; 7. Exhaust pipe; 8. Drainage mechanism; 81. Drainage pipe; 82. Liquid level sensor; 9. Drainage rod; 10. Drainage plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The rotary connection described in this device refers to the axial fixation of the bearing by mounting the bearing on the shaft, with a spring retaining ring groove provided on the shaft or shaft hole, and the rotation achieved by locking the elastic retaining ring in the retaining ring groove; the hinge connection refers to a connection method that allows movement through connecting parts such as hinges, pins, and short shafts.

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] The following is in conjunction with the appendix Figures 1-3 This embodiment describes a gas-liquid separation device for natural gas production, comprising: a separation tank 1, which is vertically arranged and has a liquid injection pipe 2 connected to its top wall; a guide pipe 3 is rotatably connected to the lower end of the liquid injection pipe 2; the guide pipe 3 extends to the lower part of the separation tank 1 and has an input shaft 4 connected to its lower end; the input shaft 4 is rotatably connected to the bottom wall of the separation tank 1; a drain port 5 is provided at the lower end of the guide pipe 3; centrifugal blades 6 are evenly distributed around the outer surface of the guide pipe 3; an exhaust pipe 7 is connected to the inner wall of the separation tank 1 above the guide pipe 3; and a draining mechanism 8 is connected to the bottom wall of the separation tank 1, which can drain the liquid at the bottom of the separation tank 1.

[0021] The gas-liquid mixture of natural gas is injected into the guide pipe 3 through the injection pipe 2 and discharged through the drain port 5 at the bottom of the guide pipe 3. The liquid enters the bottom of the separator 1, and the gas carries small droplets upward. The input shaft 4 drives the guide pipe 3 and the centrifugal blade 6 to rotate. Under the centrifugal action of the centrifugal blade 6, the small droplets are centrifuged and thrown to the inner wall of the separator 1 and flow downward. The gas rises and is discharged through the exhaust pipe 7. The gas travels from bottom to top, which prolongs the residence time in the separator 1 and allows for full contact with the centrifugal blade 6, resulting in a very good separation effect. The liquid is drawn out by the drain mechanism 8 and discharged from the bottom of the separator 1.

[0022] The draining mechanism 8 includes a drain pipe 81. The liquid pump contacts the bottom wall of the separator 1 through the drain pipe 81. Two liquid level sensors 82 at different heights are provided on the lower inner wall of the separator 1. The liquid level sensors 82 can send liquid level signals to the controller, and the controller can control the flow rate of the liquid pump according to the liquid level signals.

[0023] When the liquid level is below the lowest level sensor 82, the controller stops the pump. When the liquid level is between the two level sensors 82, the controller controls the pump's suction flow rate to be less than the inlet flow rate, and the liquid level gradually rises. When the liquid level reaches the highest level sensor 82, the controller controls the pump's suction flow rate to be greater than the inlet flow rate until the liquid level drops to the lowest level sensor 82. Then, the controller adjusts the suction flow rate to be less than the inlet flow rate, thus always keeping liquid in the lower part of the separator 1 to prevent gas from being discharged through the drain pipe 81.

[0024] Multiple guide rods 9 are evenly distributed around the inner wall of the separator 1. Each guide rod 9 has a fan-shaped cross-section, and the fan-shaped arc surface contacts the inner wall of the separator 1.

[0025] The small droplets from centrifugation are guided along the inclined surface of the guide rod 9 and quickly flow down between the two guide rods 9, which prevents the unflowed droplets from being engulfed by the rising airflow.

[0026] A drainage plate 10 is connected to the outer surface of the drainage rod 9. The drainage plate 10 is inclined from top to bottom and points to the gap between the adjacent drainage rods 9.

[0027] The droplets adhering to the drainage rod on the auxiliary part of the drainage plate flowed down.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid separation device for natural gas production, comprising: The utility model relates to a liquid injection device of separation tank, including separation tank (1), separation tank (1) vertical setting and top wall are connected with liquid injection pipe (2), Its characterized in be: liquid injection pipe (2) lower end rotatory joint and be connected with the flow guide pipe (3), and the flow guide pipe (3) extends to separation tank (1) lower part and is connected with input shaft (4) in lower end, and input shaft (4) rotatory joint is in the bottom wall of separation tank (1), and the lower end of flow guide pipe (3) is equipped with the liquid discharge port (5), and the outer surface of flow guide pipe (3) is evenly distributed with centrifugal blade (6), and the inner wall of separation tank (1) in the upper portion of flow guide pipe (3) is connected with and is communicated with the exhaust pipe (7), and the bottom wall of separation tank (1) is connected with liquid discharge mechanism (8), and liquid discharge mechanism (8) can discharge the liquid in the bottom of separation tank (1).

2. The gas-liquid separation device for natural gas production according to claim 1, characterized in that: The liquid discharge mechanism (8) includes a liquid discharge pipe (81), and a liquid pump is in contact with the bottom wall of the separation tank (1) through the liquid discharge pipe (81). Two liquid level sensors (82) with different heights are arranged on the inner wall of the lower part of the separation tank (1). The liquid level sensors (82) can send liquid level signals to a controller. The controller can control the flow of the liquid pump according to the liquid level signals.

3. The gas-liquid separation device for natural gas production according to claim 1, characterized in that: A plurality of drainage rods (9) are connected to the inner wall of the separation tank (1) in a circumferential direction. The cross section of each drainage rod (9) is in the shape of a sector. The arc surface of the sector is in contact with the inner wall of the separation tank (1).

4. A gas-liquid separation device for natural gas production according to claim 3, characterized in that: A drainage piece (10) is connected to the outer surface of the drainage rod (9). The drainage piece (10) is inclined from top to bottom and points to the gap between adjacent drainage rods (9).

Images