WO2012172872A1

WO2012172872A1 - Axial flow multi-cyclone dust collector

Info

Publication number: WO2012172872A1
Application number: PCT/JP2012/061174
Authority: WO
Inventors: 信介藤田; 関口　毅
Original assignee: スチールプランテック株式会社
Priority date: 2011-06-14
Filing date: 2012-04-26
Publication date: 2012-12-20
Also published as: JP2013000623A; CN202803438U; CN102824967A

Abstract

The purpose of the invention is to obtain an axial flow multi-cyclone dust collector that can efficiently and equally distribute and introduce dust-containing gas into multiple axial flow cyclones disposed in a gas introduction chamber. This axial flow multi-cyclone dust collector (1) is equipped with a gas introduction chamber (3) into which dust-containing gas is introduced and in which multiple axial flow cyclones (11) are disposed, a dust-collecting chamber (5) that accumulates the dust separated from the dust-containing gas by the multiple axial flow cyclones (11), and a clean gas chamber (7) for collecting the clean gas resulting from the dust being separated from the dust-containing gas, and is characterized in that the gas introduction chamber (3) is obtained by providing: a lower chamber (3a), which is formed from a ring-shaped flow channel with an open upper surface that is formed to surround the upper outer circumference of the dust-collecting chamber (5) and in which a gas inlet (9) where the dust-containing gas is introduced is formed; and an upper chamber (3b) that communicates with the opening of the lower chamber (3a) from above the lower chamber (3a) and in which the multiple axial flow cyclones (11) are disposed.

Description

Axial flow type multi cyclone dust collector

The present invention relates to an axial flow type multi-cyclone dust collector that separates and removes dust from a gas containing dust (hereinafter referred to as “dust-containing gas”).

As an example of the use of an axial-flow multi-cyclone dust collector, for example, in a gas circulation unit of a coke dry fire extinguishing equipment (hereinafter sometimes referred to as “CDQ”) at a steelmaking factory, a large amount of dust (dust) generated from a cooling tower is primary. Some are used as a secondary dust collector for further collecting the dust-containing gas after being gradually dusted.
Axial-flow multi-cyclone dust collectors generally have a gas introduction chamber into which dust-containing gas is introduced, a dust collection chamber that can store dust separated and removed from the dust-containing gas, and a clean gas from which dust is removed from the dust-containing gas. Is composed of three chambers, a cleaning gas chamber for collecting and exhausting the gas.

In the gas introduction chamber, the flow path is divided into a top plate and a lower plate, and a plurality of axial-flow cyclones are arranged and arranged at predetermined intervals in a grid pattern or a staggered pattern in the flow path. .
The dust-containing gas introduced into the gas introduction chamber passes through a plurality of axial-flow cyclones, so that the dust is separated, the separated dust is stored in the dust-collecting chamber, and the dust is removed from the dust-containing gas. The clean gas collected in the cleaning gas chamber is exhausted.

Examples of the axial flow type multi-cyclone dust collector as described above are disclosed in Patent Documents 1 and 2, for example.
As disclosed in Patent Documents 1 and 2, the gas introduction chamber is generally rectangular. The reason why the gas introduction chamber is rectangular is as follows.
The gas flow is generally such that dust-containing gas is introduced into the gas introduction chamber from the horizontal direction and exhausted to the opposite side, or dust-containing gas is introduced from the horizontal direction into the gas introduction chamber and exhausted directly above. Is. Assuming such a gas flow, if the arrangement of the axial flow type cyclone, the way in which the gas flow path is accommodated and the dimensional relationship are taken into consideration, the shape of the gas introduction chamber is naturally rectangular.
Although not shown in Patent Documents 1 and 2, as another example of the gas flow, the dust-containing gas is introduced from both opposing side surfaces of the rectangular gas introduction chamber and exhausted from one adjacent surface. There are also examples.

JP 2008-80244 A Japanese Patent Laid-Open No. 2004-322086

The most important thing in the axial flow type multi-cyclone dust collector is to introduce the dust-containing gas into the plurality of axial flow type cyclones arranged in the gas introduction chamber by distributing them efficiently and evenly.
However, since the conventional gas introduction chamber has a rectangular shape, the gas flow direction is deviated at the four corners of the gas introduction chamber, resulting in uneven flow. There was a risk of reducing the life of some axial cyclones.
If the flow rate of the dust-containing gas is set to a high value in order to improve the dust collection effect, the wear of the member in contact with the dust-containing gas is increased, and thus another problem that the replacement time of the parts is shortened occurs.

The present invention has been made to solve such a problem, and an axial flow type multi-cyclone dust collector capable of efficiently distributing and introducing dust-containing gas to a plurality of axial flow type cyclones arranged in a gas introduction chamber. The purpose is to obtain.

(1) An axial-flow multicyclonic dust collector according to the present invention includes a gas introduction chamber in which a dust-containing gas is introduced and a plurality of axial-flow cyclones is installed, and the dust-containing gas by the plurality of axial-flow cyclones. A dust collection chamber for storing the dust separated from the dust gas, and a cleaning gas chamber for collecting the cleaning gas from which the dust is separated from the dust-containing gas,
The gas introduction chamber includes a lower chamber formed of a ring-shaped flow path having an upper surface formed so as to surround an upper outer periphery of the dust collection chamber and a gas inlet into which dust-containing gas is introduced. The upper chamber is provided above the lower chamber and communicates with the opening of the lower chamber and is provided with the plurality of axial-flow cyclones.

(2) Further, in the above (1), a part of the inner wall of the lower chamber is formed by the outer wall of the dust collecting chamber.

(3) In the above (2), a part of the outer wall of the dust collecting chamber which is the inner wall of the lower chamber and a part of the inner cylinder of the axial flow type cyclone are protected to prevent wear. A board is attached.

(4) Further, in any of the above (1) to (3), an inlet casing for introducing dust-containing gas into the gas inlet is provided, and both side surfaces of the inlet casing are outer circumferences of the lower chamber. The rectifying plate is disposed in the tangential direction of the surface, and a rectifying plate is installed in the inlet casing.

(5) Further, in any of the above (1) to (4), a flow rate adjusting plate for preventing a drift is installed at a boundary portion between the upper chamber and the lower chamber. Is.

(6) Further, in any of the above (1) to (5), a flow dividing plate is provided at the gas inlet for diverting the gas flow to both sides of the lower chamber. It is.

An axial-flow multicyclonic dust collector according to the present invention is separated from the dust-containing gas by a gas introduction chamber into which dust-containing gas is introduced and a plurality of axial-flow cyclones are installed, and the plurality of axial-flow cyclones. A dust collection chamber for storing the dust and a cleaning gas chamber for collecting the cleaning gas from which the dust is separated from the dust-containing gas, wherein the gas introduction chamber is a gas into which the dust-containing gas is introduced. A lower chamber formed of a ring-shaped flow path having an upper surface opened so as to surround an upper outer periphery of the dust collecting chamber and an inlet is formed, and communicates with the opening of the lower chamber above the lower chamber An upper chamber in which the plurality of axial-flow cyclones are installed, so that the dust-containing gas introduced into the lower chamber is introduced into the upper chamber from the upper opening of the ring-shaped flow path, and the gas flow is circular. Direction from the circumferential direction to the center Since, in a plurality of axial flow cyclones installed in the upper chamber can uniformly supplied to the dust-containing gas, thereby improving the dust collecting efficiency.

It is explanatory drawing of the axial flow type multi cyclone dust collector which concerns on one embodiment of this invention. FIG. 2 is an AA view of FIG. 1. FIG. 3 is a view taken along the line BB in FIG. 1. It is explanatory drawing of an axial flow type cyclone.

DESCRIPTION OF SYMBOLS 1 Axial flow type multi cyclone dust collector 3 Gas introduction chamber 3a Lower chamber 3b Upper chamber 5 Dust collection chamber 5a Outer wall of dust collection chamber 7 Cleaning gas chamber 9 Gas inlet 11 Axial flow type cyclone 11a Axial flow type cyclone feather 11b Axial flow type cyclone Outer cylinder 11c Axial flow type cyclone inner cylinder 13

Inlet casing

13a, 13b Both side surfaces of inlet casing 15 Current plate 17 Outer wall portion 19 Bottom portion 21 Split plate 23 Top plate 25 Lower plate 27 Gas induction space 29 Protection plate 31 Flow rate adjusting plate 33 Leg 35 Discharge port 37 Discharge device 39 Cleaning gas discharge port

The axial-flow multicyclonic dust collector 1 according to the present embodiment introduces a dust-containing gas and stores a gas introduction chamber 3 in which a plurality of axial-flow cyclones 11 are installed, and dust separated from the dust-containing gas. An inverted conical dust collecting chamber 5 and a cleaning gas chamber 7 for collecting a cleaning gas from which dust is separated from the dust-containing gas are provided.
Each configuration will be described in detail.

<Gas introduction room>
The gas introduction chamber 3 includes a lower chamber 3a formed of a ring-shaped flow passage having an upper surface formed so as to surround the upper outer periphery of the dust collection chamber 5 and a gas inlet 9 into which dust-containing gas is introduced. The upper chamber 3b is formed above the lower chamber 3a so as to communicate with the lower chamber 3a and in which a plurality of axial-flow cyclones 11 are installed.
The gas inlet 9 is provided with an inlet casing 13 for guiding the dust-containing gas to the gas inlet 9. As shown in FIG. 2, both

side surfaces

13a and 13b of the inlet casing 13 are arranged in the tangential direction of the outer peripheral surface of the lower chamber 3a. A rectifying plate 15 for making the gas flow uniform is installed in the inlet casing 13.

The lower chamber 3 a is installed so as to surround the upper outer periphery of the dust collection chamber 5, a cylindrical outer wall portion 17, a bottom portion 19 connected to the dust collection chamber 5 from a lower portion of the outer wall portion 17, and an outer wall of the dust collection chamber 5. The upper surface formed by 5a is carrying out the ring shape which opened. In the present embodiment, the outer wall 5a of the dust collection chamber 5 is used as the inner wall of the lower chamber 3a. By using the outer wall 5a of the dust collecting chamber 5 as the inner wall of the lower chamber 3a, the outer wall 5a of the dust collecting chamber 5 comes into contact with high-temperature dust-containing gas, and the inside of the dust collecting chamber 5 is heated and kept warm. Can do. By heating and keeping the inside of the dust collection chamber 5, condensation in the dust collection chamber 5 is prevented, and the dust stored in the dust collection chamber 5 is solidified and the discharge port 35 is blocked when discharged. It is possible to prevent the shelf hanging phenomenon in the dust collection chamber 5 from occurring.

In the present embodiment, since the outer wall 5a of the dust collection chamber 5 forms a part of the lower chamber 3a, wear due to contact with the dust-containing gas can be considered. Therefore, it is preferable to install a protective plate (not shown) for preventing wear on a part of the outer wall 5a of the dust collection chamber 5 forming the lower chamber 3a.

As shown in FIG. 2, the gas inlet 9 in the lower chamber 3a is provided with a flow dividing plate 21 for diverting the gas flow to both sides of the lower chamber 3a. The flow dividing plate 21 is installed so as to be directed in the tangential direction of the outer wall 5 a of the dust collection chamber 5.

The upper chamber 3b is formed above the lower chamber 3a so as to communicate with the lower chamber 3a, and a plurality of axial flow type cyclones 11 are installed in the upper chamber 3b.
The upper chamber 3b is installed at the boundary between the outer wall 17 extending continuously upward from the outer wall 17 of the lower chamber 3a, the top plate 23 installed at the upper end of the outer wall 17, and the dust collection chamber 5. The lower plate 25 is formed.
The lower plate 25 is provided with a plurality of axial flow type cyclones 11. An example of the arrangement of the axial flow type cyclone 11 is shown in FIG. As shown in FIG. 3, the axial flow type cyclone 11 is arranged so as to provide a gas guide space 27 that also serves as a maintenance passage at an appropriate position so that the gas flow is not hindered.

As the axial flow type cyclone 11, for example, a known one disclosed in Patent Document 1 can be used. As shown in FIG. 4, the axial-flow cyclone 11 includes an axial-flow cyclone blade 11 a disposed on the lower plate 25, an axial-flow cyclone outer cylinder 11 b installed toward the lower side of the lower plate 25, An axial-flow type cyclone inner cylinder 11c having a lower end inserted into the axial-flow type cyclone outer cylinder 11b and an upper end extending above the top plate 23 is provided. Since the axial-flow type cyclone inner cylinder 11c is worn by being exposed to the dust-containing gas, it is preferable to provide a protective plate 29 for preventing wear.

As shown in FIG. 3, a flow rate adjusting plate 31 for adjusting the gas flow flowing from the lower chamber 3a to the upper chamber 3b is installed at the boundary between the lower chamber 3a and the upper chamber 3b near the gas inlet 9. ing. Near the gas inlet 9, there is a possibility that the amount of gas flowing from the lower chamber 3a to the upper chamber 3b may increase. By adjusting this, an even gas flow from the lower chamber 3a to the upper chamber 3b is realized. is there.

<Dust collection chamber>
The dust collection chamber 5 stores the dust separated from the dust-containing gas. The dust collection chamber 5 of the present embodiment is formed by an inverted conical hopper type container. A plurality of legs 33 for supporting the container are provided on the outer periphery of the container. A discharge port 35 for discharging stored dust is provided at the lower end of the dust collection chamber 5, and a discharge device 37 for discharging dust from the discharge port 35 is installed at the discharge port 35 at every desired time. ing.
In the present embodiment, as described above, since the outer peripheral shape of the dust collection chamber 5 is circular, the outer wall 5a of the dust collection chamber 5 also serves as the inner wall of the lower chamber 3a in the gas introduction chamber 3.

<Cleaning gas chamber>
The cleaning gas chamber 7 collects the cleaning gas from which dust is separated from the dust-containing gas, and is formed by a cylindrical container in the present embodiment.
The cleaning gas discharged from the axial flow type cyclone inner cylinder 11 c of each axial flow type cyclone 11 is collected in the cleaning gas chamber 7 and discharged from the cleaning gas discharge port 39.

The operation of the present embodiment configured as described above will be described.
The dust-containing gas supplied to the inlet casing 13 is rectified by the rectifying plate 15 and guided to the gas inlet 9 of the lower chamber 3 a in the gas introduction chamber 3. The dust-containing gas guided to the gas inlet 9 is branched left and right by the flow dividing plate 21 and introduced into the ring-shaped lower chamber 3a. The dust-containing gas introduced into the lower chamber 3a changes its flow upward and flows into the upper chamber 3b. As described above, since the inflow path of the dust-containing gas to the upper chamber 3b is directed from the circumference to the circle center, the distances between arbitrary points on the circle center and the circumference are all equal, and the lower plate of the upper chamber 3b. The dust-containing gas can be evenly distributed to the plurality of axial flow type cyclones 11 arranged in 25.
Further, it is desirable that the outer wall surface 17 constituting the inflow path of the dust-containing gas into the upper chamber 3b is made to be a circular shape close to a streamline rather than a rectangular shape, because the fluid resistance can be reduced.

Even if the inflow path of the dust-containing gas into the upper chamber 3b is directed from the periphery to the center, if the lower chamber 3a, the upper chamber 3b, and the lower plate 25 are rectangular in shape, the rectangular center point and the circumferential Since the distances between the arbitrary points are all different, it is difficult to evenly distribute the axial flow cyclones 11 arranged in the same manner as in the present embodiment.
Further, when the flow path of the dust-containing gas is a rectangular wall surface and the four corners are edges, eddy currents are generated at the corners and the fluid resistance is increased.
For this reason, it is desirable that the peripheral wall of the dust-containing gas flow path be circular.

When the gas introduction chamber 3 is circular, the circumferential length, which is the horizontal length of the dust-containing gas flow path, can be ensured longer than the rectangular case, and the height of the dust-containing gas flow path in the vertical direction can be reduced. Even so, the dust-containing gas flow rate can be adjusted to an appropriate flow rate without any increase in uneven wear, and thus the entire apparatus can be made compact.

The dust-containing gas flowing into the upper chamber 3b passes through the axial-flow cyclone blade 11a installed on the lower plate 25, and dust is separated and removed by the axial-flow cyclone outer cylinder 11b. It is guided to the cleaning gas chamber 7 formed above the top plate 23 through the inside. The clean gas guided to the cleaning gas chamber 7 can be collected and exhausted in any direction.
On the other hand, the separated and removed dust is stored in the dust collection chamber 5 and is carried out of the system by a discharge device 37 below the dust collection chamber 5 when a predetermined time has elapsed.

As described above, in the present embodiment, the gas introduction chamber 3 is composed of the ring-shaped lower chamber 3a and the upper chamber 3b formed above the lower chamber 3a, and the dust containing material introduced into the lower chamber 3a. Since the gas is supplied to the upper chamber 3b from the entire circumference of the lower chamber 3a, the dust-containing gas is evenly distributed evenly to the axial-flow cyclone 11 arranged at a predetermined interval on the lower plate 25 of the upper chamber 3b. Distributing supply can be achieved, and the dust collection effect can be improved as compared with the case where the gas introduction chamber is rectangular, and the wear of the parts can be extended and the life can be prevented from being shortened.
In the present embodiment, since the outer circumferences of the lower chamber 3a and the upper chamber 3b are circular, the rigidity of the container is increased with respect to the internal pressure (which may be positive or negative), and reinforcement is performed. It can also be reduced, leading to lower transportation costs and easier construction.
Furthermore, since the gas introduction chamber 3, the dust collection chamber 5 and the cleaning gas chamber 7 are made circular, the circumference can be made shorter than that of the rectangular case, so that the construction area of the coating and heat insulating material is reduced and the construction cost is reduced. .
Further, in the present embodiment, the dust collection chamber 5 is formed by a round (circular) hopper on an inverted cone, so that the container shape is minimized and compact as long as the inclination angle is the same as that of the square hopper. be able to. The reason is as follows. In the case of a square hopper, the inclination angle at the corner portion is the most gradual, so it is necessary to set the inclination angle at the corner portion to be greater than the friction angle of the powder. On the other hand, in the case of a circular hopper, the inclination angles are all the same in the circumferential direction, and therefore the inclination angle may be set to be equal to or greater than the powder friction angle. If the angle of inclination of the corner of the square hopper is the same as that of the circular hopper, the circular hopper is more compact than the square hopper because the flat cross section of the circular hopper is inscribed in the flat cross section of the square hopper. It can be shaped.

Claims

A gas introduction chamber in which a dust gas is introduced and a plurality of axial flow cyclones are installed; a dust collection chamber for storing dust separated from the dust gas by the plurality of axial flow cyclones; An axial flow type multi-cyclone dust collector having a cleaning gas chamber for collecting cleaning gas from which dust is separated from dust gas,
The gas introduction chamber includes a lower chamber formed of a ring-shaped flow path having an upper surface formed so as to surround an upper outer periphery of the dust collection chamber and a gas inlet into which dust-containing gas is introduced. An axial-flow multi-cyclone dust collector comprising an upper chamber in communication with the opening of the lower chamber above the lower chamber and in which the plurality of axial-flow cyclones are installed.
The axial flow type multi-cyclone dust collector according to claim 1, wherein a part of an inner wall of the lower chamber is formed by an outer wall of the dust collecting chamber.
3. The shaft according to claim 2, wherein a protection plate for preventing wear is attached to a part of the outer wall of the dust collecting chamber which is an inner wall of the lower chamber and a part of the inner cylinder of the axial flow type cyclone. Flow type multi cyclone dust collector.
An inlet casing for introducing dust-containing gas into the gas inlet; both side surfaces of the inlet casing are arranged in a tangential direction of the outer peripheral surface of the lower chamber, and a rectifying plate is installed in the inlet casing. The axial flow type multi cyclone dust collector as described in any one of Claims 1 thru | or 3 characterized by the above-mentioned.
The axial flow type multi-cyclone dust collector according to any one of claims 1 to 4, wherein a flow rate adjusting plate for preventing a drift is installed at a boundary portion between the upper chamber and the lower chamber.
6. An axial flow type multi-cyclone dust collector according to any one of claims 1 to 5, wherein a diverter plate is provided at the gas inlet for diverting a gas flow to both sides of the lower chamber.