CN203577547U - Multiphase flow filtration separator - Google Patents

Abstract

The utility model discloses a multiphase flow filter separator. The separator is composed of a cylinder body, an air intake pipe, a conduit, a filter element, an air outlet pipe, an upper sewage discharge pipe and a lower sewage discharge pipe. A flow guide device is installed on the conduit through a flange. The guide device is composed of a bottom cover, guide vanes and a top cover. The top cover is concave, and the bottom cover is bell-shaped. Several arc-shaped guide vanes are installed between the top cover and the bottom cover in a circular array to form a gas channel that rotates upward. The cross-sectional area of the gas channel gradually expands with the direction of the air flow, the gas flow rate gradually decreases, and the gas is in a swirling state. On the one hand, it can realize the pre-separation of impurities, reduce the workload of other separation components in the filtration and separation equipment, prolong the service life of the filter element, and reduce the operating cost. On the other hand, it can improve the flow field distribution of the gas inside the filtration and separation equipment and slow down the gas flow rate. Effectively buffer the impact of gas on the inner wall of the filter and separation equipment cylinder, and evenly distribute the working load of the filter element.

Description

Multiphase Flow Filtration Separator

technical field

The utility model relates to a multiphase flow filter separator and belongs to the technical field of oil and gas separation devices.

Background technique

In the process of surface gathering, transportation and purification of natural gas, it is necessary to use a variety of filtration and separation equipment to remove solid and liquid impurities in natural gas, so as to ensure the safety of gas and gathering and transportation. Commonly used filtration and separation equipment include gravity separators, centrifugal or cyclone separators, coalescing filters, etc. Due to the instability of the on-site gas working conditions, in order to ensure the separation performance, it is not possible to rely on one filter separation device to remove the solid and liquid phase impurities of the gas, but to use two or more filter separation devices in combination, such as cyclone A combination of separator and coalescing filter.

The three principles for separating solid and liquid impurities from gas are momentum mechanics, gravity settling and coalescence, and any type of filtration separation equipment will use one or more of the above three principles. By changing the movement direction of gas and impurities, such as centrifugation or cyclone separation, the separation of large particles of impurities can be achieved; gravity is the most important force to complete the separation, and the separation is completed through the settlement of impurities; fine droplets (such as mist flow) are difficult Separation by gravity, the principle of coalescence can be used to coalesce small droplets into large droplets, and then realize gas-liquid separation.

At present, most of the filtration and separation equipment adopts the operation mode that natural gas directly enters the inner cavity of the filtration and separation equipment from the inlet pipeline to perform separation. The Chinese utility model patent "An Integrated Gravity Separator" with the patent number ZL200920222609.8 (publication number CN201055811Y) discloses a cylinder body, an L-shaped air inlet pipe and an air outlet arranged on the cylinder body. Integrated gravity separator. The barrel body is divided into a first chamber connected with the air outlet and a second chamber connected with the air inlet pipe, and a filtering and separating filter element is arranged in the second chamber. The mouth of the L-shaped air intake pipe is facing away from the filtration and separation filter element, facing the inner wall of the cylinder, and the inner wall of the cylinder facing the mouth of the pipe is provided with an anti-shock plate, so that the impurity-containing gas suddenly decelerates and flows after passing through the L-shaped air intake pipe. The direction changes, and the initial separation of gas and impurities is realized under the combined action of inertia, centrifugal force and gravity. The disadvantages of this technology are: in actual operation, the impurity-containing gas flows at high speed in the L-shaped intake pipe, and suddenly decelerates when it hits the anti-shock plate, resulting in a large energy loss, and forms a complex turbulent flow zone in the first chamber, which is not conducive to impurities separation. The design of the anti-shock plate is actually equivalent to the traditional separator inlet baffle type diverter, and the pre-separation effect is poor.

Utility model content

The utility model overcomes the problems of uneven flow field distribution, poor pre-separation effect and the like existing in the existing separation equipment, and provides a multiphase flow filter separator equipped with a flow guiding device.

The utility model is composed of a cylinder body, an air intake pipe, a conduit, a filter element, an air outlet pipe, an upper sewage pipe and a lower sewage pipe, and a guide device is installed on the conduit through a flange.

The utility model can improve the flow field distribution of the gas inside the filtration and separation equipment, make the gas evenly enter the filter element for filtration and separation, slow down the gas flow rate, effectively buffer the impact of the gas on the inner wall of the filtration and separation equipment cylinder, and utilize the principle of momentum and gravity sedimentation. Realize the pre-separation of impurities (especially liquid phase substances), effectively improve the separation efficiency of solid and liquid phase impurities.

Description of drawings

Fig. 1 is a schematic diagram of a filter separator;

Figure 2 is an assembly drawing of the flow guiding device and the inlet conduit;

Fig. 3 is a diversion device;

Figure 4 is a schematic diagram of the shape of the guide vane;

Figure 5 is a comparison chart of separation efficiency.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described concretely:

Referring to Fig. 1, the utility model is composed of a cylinder body 6, an air intake pipe 1, a conduit 2, a filter element 4, an air outlet pipe 5, an upper sewage pipe 7 and a lower sewage pipe 8, and a guide device 3 is installed on the conduit 2 through a flange .

Referring to Fig. 2 and Fig. 3, the described guide device 3 is composed of a bottom cover 3a, a guide vane 3b and a top cover 3c, the bottom cover 3a is bell-shaped, and is connected to the conduit 2 through a flange; the inner diameter of the inlet of the bottom cover 3a is Same as the inner diameter of the conduit 2, the inner diameter of the outlet is 1/3 to 1/2 of the inner diameter of the cylinder 6.

The top cover 3c is concave, and together with the bottom cover 3a and guide vanes 3b forms a gas channel with a gradually increasing cross-sectional area rotating upwards to ensure smooth gas flow and form an upward swirling airflow with a certain inclination angle.

Referring to Fig. 3 and Fig. 4, the guide vanes 3b are arc-shaped and located between the bottom cover 3a and the top cover 3c in a circular array. Its degree of curvature is: the point of intersection of the projection line on the outer edge of the guide vane 3b and the lower end surface of the bottom cover 3a is P, the tangent line of the projection line on the outer edge of the guide vane 3b, and the intersection point P and the bottom cover 3a and the top cover 3c The angle α formed by the straight line at the center of the circle is 20° to 60°; the intersection point of the projection line on the outer edge of the guide vane 3b and the top cover 3c is Q, and the tangent line of the projection line on the outer edge of the guide vane 3b passes through the intersection point Q and the bottom The angle β formed by the straight line of the center of circle of the cover 3a and the top cover 3c is 60° to 90°.

The working principle of the utility model is as follows: the gas enters the diversion device 3 from the intake pipe 1 and the conduit 2, and the gas is formed into a swirling flow by the diversion device 3 and then enters the filter separator cylinder 6. When the gas flows through the inside of the flow guiding device 3, since the cross-sectional area of the gas channel gradually increases with the direction of the gas flow, the gas flow rate decreases and the flow direction changes, and some impurities entrained in the gas are blocked and momentum loss occurs. At the outlet of the diversion device 3, the impurities with a large momentum loss will first settle to the bottom of the filtration and separation equipment under the action of gravity; 6 The inner wall gathers and flows to the bottom of the filter separator under the action of gravity, and the liquid phase at the bottom is discharged through the lower sewage pipe 8. Impurities with smaller particle sizes enter the filter element 4 of the filter separator with the gas for further coalescence and separation. Most of the impurities are enriched at the bottom of the filter element 4 and discharged to the bottom of the filter separator; a small amount of penetrating impurities are discharged through the upper sewage pipe 7. The separated clean gas is discharged through the outlet pipe 5.

The filter separator integrates the three separation methods of momentum mechanics, gravity sedimentation and coalescence, has good separation effect, and is applicable to a wide range of working conditions, especially for working conditions with large liquid content.

Application example: see Figure 5, add a certain concentration of particles with a median particle size of 18 μm to the inlet gas, and test the gravity of a gravity separator without any filter separation elements and only with a flow guide component at different gas velocities separation efficiency of the separator. The results show that after the device is installed, the separation efficiency of the filter separation device for impurities with a particle size of 15 to 20 microns exceeds 70%, which reduces the workload of other separation components in the filter separation equipment, prolongs the service life of the filter element, and reduces Operating costs.

Claims (6)

1. The multiphase flow filter separator consists of a cylinder body (6), an air inlet pipe (1), a conduit (2), a filter element (4), an air outlet pipe (5), an upper sewage pipe (7) and a lower sewage pipe (8) ), which is characterized in that: a guide device (3) is installed on the conduit (2) through a flange. the 2. The multiphase flow filter separator according to claim 1, characterized in that: the flow guide device (3) consists of a bottom cover (3a), guide vanes (3b) and a top cover (3c), the bottom cover ( 3a) is in the shape of a bell mouth, and is connected to the conduit (2) through a flange. the 3. The multiphase flow filter separator according to claim 1 or 2, characterized in that: the inner diameter of the inlet of the bottom cover (3a) is the same as the inner diameter of the conduit (2), and the inner diameter of the outlet is 1/3 of the inner diameter of the cylinder (6) to 1/2. the 4. The multiphase flow filter separator according to claim 1 or 2, characterized in that: the top cover (3c) is concave, and forms a rotating upward, cross-sectional Gas channels with increasing area. the 5. The filter separator for multiphase flow according to claim 1 or 2, characterized in that: the guide vanes (3b) are arc-shaped, located between the bottom cover (3a) and the top cover (3c), in a circular array. the 6. The multiphase flow filter separator according to claim 5, characterized in that: the curvature of the guide vane (3b) is constrained by two angles, one is under the projection line of the outer edge of the guide vane 3b and the bottom cover 3a The intersection point of the end face is P, and the angle α formed by the tangent line of the projection line of the outer edge of the guide vane 3b and the center of circle of the intersection point P and the bottom cover 3a and the top cover 3c is 20° to 60°; The intersection point of the projection line of the outer edge of the blade 3b and the top cover 3c is Q, and the angle β formed by the tangent of the projection line of the outer edge of the guide vane 3b and the straight line passing through the intersection point Q and the center of circle of the bottom cover 3a and the top cover 3c is 60° to 90°. the

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