KR20210015339A - Axial flow cyclone apparatus - Google Patents

Abstract

One embodiment of the present invention relates to an axial flow cyclone device for separating particles from a fluid flowing in an up-down axial direction. The axial flow cyclone device comprises: a casing in which a hollow is formed in a vertical direction; a vortex finder having a hollow in the vertical direction, wherein at least a portion of the vortex finder is disposed inside the casing; and a plurality of guide vanes extending obliquely with respect to a horizontal direction on the outer circumferential side of the vortex finder. The guide vane may be formed that a thickness of a lower surface is thicker than a thickness of an upper surface.

Description

Axial flow cyclone device {AXIAL FLOW CYCLONE APPARATUS}

The present invention relates to an axial flow type cyclone device, and more particularly, to an axial flow type cyclone device including a guide vane shaped to improve the rotational flow velocity of a fluid.

The cyclone device is one of the separation devices using a centrifugal force generated by forming a rotational flow in a fluid, and is used to separate solid particles from a gaseous or liquid fluid.

The cyclone device can be classified into a vertical flow cyclone and an axial flow cyclone according to the flow direction of the fluid.

The axial flow cyclone has a fixed guide vane for forming a swirling flow, that is, a helical flow, and it is mainly used to construct a multi-cyclone device because it can induce a uniform flow distribution.

Meanwhile, the particle separation efficiency using the axial flow cyclone is related to the rotational flow velocity of the fluid, and the rotational flow velocity of the fluid is highly correlated with the shape of the fixed guide vane of the axial flow cyclone.

Accordingly, there is a need for an optimal design of a fixed spiral blade capable of improving the rotational flow rate of a fluid in terms of particle separation efficiency.

The above-described background technology is technical information that the inventor possessed for derivation of the embodiments of the present invention or acquired during the derivation process, and is not necessarily known to the public before filing the embodiments of the present invention. none.

The present invention has been conceived to solve the above-described problem, and is to provide an axial flow type cyclone device including a guide vane having a shape for improving a rotational flow velocity of a fluid.

However, the problem to be solved by the present invention is not limited to the above-mentioned problems, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

An embodiment of the present invention is an axial flow cyclone device for separating particles from the fluid flowing in the vertical axial direction, the casing is formed with a hollow in the vertical direction; A vortex finder having a hollow formed in the vertical direction and at least partially disposed inside the casing; And a plurality of guide vanes extending obliquely with respect to the horizontal direction to the outer peripheral surface side of the vortex finder, wherein the guide vanes may have a lower surface having a thickness greater than that of an upper surface.

In this embodiment, it is preferable that the thickness of the lower surface of the guide vane is 1.5 times or more and less than 3.5 times the thickness of the upper surface.

In this embodiment, it is preferable that the inclination angle of the guide vane with respect to the horizontal direction is 60 ° to 70 °.

In this embodiment, it is preferable that the shortest distance in the vertical direction between the upper and lower surfaces of the guide vanes is 0.2 to 0.3 times the inner diameter of the casing.

According to an embodiment of the present invention, a guide vane having an optimal shape capable of improving a rotational flow velocity of a fluid can be provided, so that the separation efficiency of particles in a fluid can be easily improved.

1 is a diagram schematically showing an axial flow cyclone device according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing an embodiment of a unit axial flow cyclone unit of the axial flow cyclone device shown in FIG. 1 and showing a simulation result of a rotational flow velocity of a fluid through CFD.
3 is a diagram schematically showing a unit axial flow type cyclone unit (comparative example) according to the prior art, and showing a simulation result of a rotational flow velocity of a fluid through CFD.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims. Meanwhile, terms used in the present specification are for explaining embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements, and/or elements, steps, actions and/or elements mentioned. Or does not exclude additions. Terms such as first and second may be used to describe various components, but the components should not be limited by terms. The terms are only used for the purpose of distinguishing one component from another component.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a diagram schematically showing an axial flow cyclone device according to an embodiment of the present invention.

Referring to FIG. 1, an axial flow cyclone device 100 according to an embodiment of the present invention is a device for separating particles from a fluid flowing in an upper and lower axial direction (y-axis direction based on FIG. 1 ), and includes a casing 110, A vortex finder 120 and a guide vane 130 may be included.

Here, the fluid may be a liquid or gaseous fluid. In this embodiment, it is assumed that the gaseous fluid (Gas), and the particles are assumed to be solid particles.

The casing 110, the vortex finder 120, and the guide vane 130 may form a group and may be divided into unit axial flow type cyclone parts 100a, 100b, and 100c.

The casing 110 is formed with a hollow in the vertical direction to form an outer wall around the hollow. A swirling flow (orbiting flow) of fluid and particles is formed between the vortex finder 120 and the casing 110 to be described later.

Particles heavier than the fluid rotate with a larger radius of rotation than the fluid in the swirling flow. Since the particles rotate within the area defined by the casing 110, the maximum radius of rotation of the particles may be defined by the inner radius of the casing 110.

The lower portion of the casing 110 may have an inclined shape so as to become narrower downward. The reason why the lower part of the casing 110 has a narrower shape is to induce the falling of particles separated from the fluid and to prevent the particles from being discharged to the vortex finder 120 along the fluid.

The upper portion of the casing 110 may be formed to accommodate at least a portion of the vortex finder 120. The upper portion of the casing 110 may be formed to have a constant inner diameter. The upper and lower portions of the casing 110 may be divided based on a position where the inner diameter is narrowed.

A particle discharge port 110a may be formed at the lower end of the casing 110. Particles separated from the fluid may be discharged from the unit axial flow cyclone units 100a, 100b, and 100c through the particle discharge port 110a.

Casings 110 of the unit axial flow type cyclone parts 100a, 100b, and 100c may be provided inside the outer case 150.

A particle discharge port 150a may be formed at the bottom of the outer case 150, and particles discharged from each unit axial flow type cyclone part 100a, 100b, 100c may be discharged to the outside through the particle discharge port 150a. .

The vortex finder 120 is provided to discharge a fluid separated from the particles. The vortex finder 120 is formed with a hollow in the vertical direction to form an outer wall around the hollow. At least a portion of the vortex finder 120 may be disposed inside the casing 110.

The lower portion of the vortex finder 120 may have an inclined shape so as to become narrower downward. The reason that the lower part of the vortex finder 120 has a shape that narrows downward is to prevent particles from being discharged to the vortex finder 120 along the fluid.

The upper portion of the vortex finder 120 may be formed to have a constant inner diameter. The upper and lower portions of the vortex finder 120 may be divided based on a position where the inner diameter becomes narrower.

The guide vane 130 may be provided on the outer circumferential side of the vortex finder 120 in a form that extends obliquely with respect to the horizontal direction (the x-axis direction based on FIG. 1 ). A plurality of guide vanes 130 may be arranged along the circumferential direction of the vortex finder 120 and provided.

As the guide vane 130 extends obliquely with respect to the horizontal direction on the outer circumferential side, fluid and particles introduced into the inlet of the unit axial flow type cyclone units 100a, 100b, and 100c may form a swirling flow.

FIG. 2 schematically shows an embodiment of the unit axial flow type cyclone units 100a, 100b, and 100c of the axial flow type cyclone device 100 shown in FIG. 1, and is a diagram showing a result of simulation of a rotational flow velocity of a fluid through CFD.

Example shape condition

Upper inner diameter of vortex finder 120 (Φ1): 300 mm

Inner diameter of the lower end of the vortex finder 120 (Φ2): 200 mm

Upper inner diameter of casing 110 (Φ3): 500 mm

Inner diameter of the lower end of the casing 110 (Φ4): 187.5 mm

Interval (h1) between the upper end of the casing 110 and the upper surface of the guide vane 130: 100 mm

The shortest distance (h2) between the upper and lower surfaces of the guide vane 130: 100 mm

The distance between the upper end of the casing 110 and the position where the inner diameter of the vortex finder 120 starts to decrease (h3): 300 mm

Distance between the upper end of the casing 110 and the lower end of the ball tension finder 120 (h4): 675 mm

Distance between the upper end of the casing 110 and the position where the inner diameter of the casing 110 begins to decrease (h5): 1050 mm

Distance between the lower end of the casing 110 and the position where the inner diameter of the casing 110 starts to decrease (h6): 1250 mm

The thickness of the upper surface of the guide vane 130 (d1): 10 mm

The thickness of the lower surface of the guide vane 130 (d2): 30 mm

The inclination angle of the guide vane 130 in the horizontal direction (θ, the inclination angle of the line connecting the center of the upper surface and the lower surface of the guide vane 130 in the horizontal direction): 70 °

Quantity of guide vanes 130: 12

Example fluid flow conditions

The flow rate of gas flowing through the upper end of the casing 110 was assumed to be 2.312715 kg/s and the flow rate of gas was 19.793268 m/s.

3 is a diagram schematically showing a unit axial flow type cyclone unit (comparative example) according to the prior art, and showing a simulation result of a rotational flow velocity of a fluid through CFD.

Shape condition of comparative example

The shape conditions of the guide vanes 13 were all assumed to be the same as those of the embodiment except that the thickness d1' of the upper surface and the thickness d2' of the lower surface of the guide vane 13 were set equal to 10 mm.

Fluid flow conditions of the comparative example

The flow rate of gas flowing through the upper end of the casing 11 was assumed to be 2.312715 kg/s and the flow rate of gas was 19.793268 m/s.

Looking at the distribution of the flow velocity of the fluid at the lower part of the guide vane, it is obvious that the flow rate of the fluid in the unit axial flow type cyclone unit 100a, 100b, 100c according to the embodiment of the present invention is more than that of the unit axial flow type cyclone unit 10 according to the prior art. It is confirmed that the flow rate appears larger.

Based on this, it can be seen that it is preferable that the thickness d2 of the lower surface of the guide vane 130 is thicker than the thickness d1 of the upper surface.

The following table shows the setting of the unit axial flow cyclone unit according to the comparative examples and various examples and the simulation analysis results using CFD.

In Comparative Examples and Examples, the thickness of the upper surface of the guide vane is set equal to 10 mm, and the remaining shape conditions and flow conditions are the same as described above.

The location of section 1 is a position corresponding to the lower surface of the guide vane, the location of section 2 is a location 50 mm apart from section 1, and the location of section 3 is a location 50 mm apart from section 2 downward.

Comparing Comparative Examples and Examples 1 to 7, it was found that when the thickness of the lower surface is thicker than that of the upper surface of the guide vane, both the maximum rotational flow rate and the average rotational flow rate of the fluid increase.

On the other hand, the differential pressure, which is the difference between the pressure at the inner diameter of the upper end of the vortex finder and the pressure at the inner diameter of the upper end of the casing, increased in Examples 1 to 7 compared to the Comparative Example, but the thickness ratio of the thickness of the lower surface to the upper surface thickness of the guide vane was 1.5 times. It was confirmed that the differential pressure tended to decrease gradually from the level to the level of 3 times, but increased sharply from 3.5 times.

Based on this, the thickness of the guide vane 130 is preferably 1.5 times or more and less than 3.5 times the thickness d2 of the upper surface, and the thickness d2 of the lower surface is 3 times the thickness d1 of the upper surface. It may be more preferable to be more than 3.4 times or less.

On the other hand, the inclination angle θ of the guide vane 130 in the horizontal direction may be 55 ° to 75 °, more preferably 60 ° to 70 °. As the inclination angle θ decreases, the rotational flow velocity of the fluid may increase and the differential pressure may increase.Therefore, the effect of increasing the rotational flow velocity due to an increase in the thickness of the lower surface of the guide vane 130 is not large, but the effect of increasing the differential pressure becomes larger. Because it can.

In addition, it is preferable that the shortest distance h2 between the upper and lower surfaces of the guide vanes 130 is 0.2 to 0.3 times the upper inner diameter Φ3 of the casing 110. This is because when the shortest distance h2 between the upper and lower surfaces of the guide vane 130 is longer than a predetermined length, the effect of increasing the rotational flow velocity of the fluid is not large, but only the differential pressure may be increased.

According to an embodiment of the present invention, a guide vane having an optimal shape capable of improving the rotational flow rate of a fluid, that is, a guide vane having a lower surface thickness greater than that of an upper surface, is provided to facilitate the separation efficiency of particles in the fluid. Can be improved.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the scope of the appended claims will include such modifications or variations as long as they fall within the gist of the present invention.

100: axial flow type cyclone device
110: casing
120: Vortex finder
130: guide vane

Claims (4)

As an axial flow type cyclone device that separates particles from fluid flowing in the upper and lower axial directions,
A casing with a hollow formed in the vertical direction;
A vortex finder having a hollow formed in the vertical direction and at least partially disposed inside the casing; And
Includes; a plurality of guide vanes extending obliquely with respect to the horizontal direction on the outer peripheral surface side of the vortex finder,
The guide vane,
An axial flow type cyclone device in which the lower surface is formed thicker than the upper surface. The method of claim 1,
The guide vane,
The thickness of the lower surface is 1.5 times or more and less than 3.5 times the thickness of the upper surface, the axial flow type cyclone device. The method of claim 1,
The inclination angle of the guide vane with respect to the horizontal direction is 60 ° to 70 °, axial flow type cyclone device. The method of claim 1,
The shortest distance in the vertical direction between the upper surface and the lower surface of the guide vane is 0.2 to 0.3 times the inner diameter of the casing, the axial flow type cyclone device.

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