GB2034204A

GB2034204A - Cyclone Dust Separator

Info

Publication number: GB2034204A
Application number: GB7937065A
Authority: GB
Original assignee: PLENTY GROUP Ltd
Current assignee: PLENTY GROUP Ltd
Priority date: 1978-10-27
Filing date: 1979-10-25
Publication date: 1980-06-04
Also published as: GB2034204B

Abstract

A separator for separating particles of contaminate matter from gas, e.g. dust from air, is of the type in which the incoming contaminated gas is caused to swirl around the inside of one or more cyclone tubes (2), the purified gas being discharged via a vortex finder (8) within the or each cyclone tube. Hitherto the contaminated gas has entered the tube(s) tangentially to establish the desired swirl. In the separator of the invention means, preferably flat plates (10, 12), are provided in the space between the tube (2) and the vortex finder (8) to establish the swirl and hence the gas may be introduced axially enabling the tubes, in the case of a multi-tube separator, to be packed closer together within the separator body. <IMAGE>

Description

SPECIFICATION Multi-cyclone Dust Separator This invention relates to separators and in particular to separators for separating particles of contaminate matter from gas, e.g. dust from air.

Separators have been proposed in which the incoming contaminated gas is caused to circulate or swirl, around the inside of one or more cyclone tubes. At a point adjacent the bottom portion of the or each tube the gas forms a vortex and then flows up through a vortex tube positioned centrally within the main tube and exits at the top of the vessel. The contaminated matter is acted on by centrifugal force during the passage of the gas down the tube and impinges on the inside wall of the tube before discharging through an outlet at the base of the vessel. Such a separator will hereinafter be referred to as a separator of the type described.

Hitherto, the contaminated gas has entered the tube or tubes of separators of this type tangentially or approximately tangentially so as to establish the desired swirling action around the interior thereof.

A separator of the type described in accordance with this invention has a gas inlet at the top of the or each cyclone tube, means being provided within the body of each tube positioned adjacent the top of the tube in the space between the wall of the tube and the vortex tube to cause the incoming gas to swirl in a spiral path down around the tube wall.

The swirl creation means preferably comprises two flat plates each positioned in its tube at an angle to the axis thereof and on opposite sides and each preferably extending through an arc of about 1800. The plates may be positioned through cuts in the wall of the cyclone tube and abut and be secured to the inner vortex tube.

The gas which will normally enter the tubes parallel to the axis thereof then impinges against one of the angled plates which acts to direct the gas down at an angle to pass beneath the other plate and thus establish the desired swirling action.

The top entry of the gas to each cyclone tube of a separator in accordance with the invention means that a number of tubes may be packed close together within an encompassing body (preferably a tubular body) of the separator, the separator having an inlet chamber communicating with the open tops of the tubes with the vortex tubes of each cyclone tube extending up across the inlet chamber to exit through a top plate of the inlet chamber to a gas outlet chamber.

The invention also extends to a cyclone tube for use in a separator of the type described in accordance with the invention.

A separator in accordance with the invention has been found to have a higher efficiency and to be easier to manufacture than one having standard cyclone tubes.

The invention will now be further described by way of example with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic elevation of one cyclone tube of a separator in accordance with the invention; Figure 2 is a diagram showing in elevation a number of tubes of a separator in accordance with the invention, and Figure 3 is a view corresponding to Figure 2 but showing the various tubes in plan view.

The separator shown in the drawings comprises a number of cyclone tubes 2 each of which is formed with an open top illustrated at 4 and a conically tapering bottom end 6. A vortex tube 8 extends centrally into the tube and two flat plates 10, 12 are positioned through 1 800 cuts in the wall of the tube and welded to the tube so as to lie across each side of the tube extending downwardly at an angle of about 450 to the axis of the tube. The two plates extend at an angle of 900 to each other and each extends over an arc of about 1800 around the inner vortex tube 8 to which they are secured.

In use contaminated gas entering through the open top 4 of a tube impinges against one of the plates 10, 12 which causes the gas to flow down at an angle to the axis of the tube and angularly around the wall of the tube through the gap between the two plates, it being understood that one of the highermost points of one of the plates is located above the lowermost point of the other plate (see Figure 3).

The gas thus spirals down in the path illustrated by the dash lines 14 in Figure 2 and in the direction of the arrows.

The contaminate matter, such as dust, is forced against the walls of the tube by centrifugal force as the contaminated gas spirals down around the tube in the path 14 and this dust finally exits from the open bottom end of the tube at 18.

As the clean gas reaches the tapering portion of the tube a vortex is created which tends to rise up the centre of the tube as indicated by the dash lines 1 6 as a vortex and through the vortex tube 8.

As the gas inlet to each cyclone tube is from the top of the tube, a number of identical tubes 2 can be packed close together within an encompassing vessel (not shown) to form a separator as illustrated in Figure 3. The open top ends 4 of the tubes each communicates with an inlet chamber indicated at 20 and formed between the tops of the tubes and a plate 22. The contaminated gas is introduced into the inlet chamber 20 from whence it flows down through the various tubes. Each of the vortex tubes 8 extends up across the inlet chamber and through holes in the top plate 22 in which they are welded, so that the cleaned gas emerges from the top of the vortex tubes into an outlet chamber 24 positioned above plate 22.

Equally, the contaminate matter exiting from the bottom end 18 of each of the tubes falls into a contaminant chamber formed below a bottom plate 26 into which the bottom end portions of each of the tubes is secured.

Claims

1. A cyclone tube for a separator of the type described having a gas inlet at its top, means being provided within the body of the tube positioned adjacent to the top of the tube in the space between the wall of the tube and the vortex tube to cause the gas to swirl in a spiral path down around and within the cyclone tube wall.

2. A cyclone tube as claimed in Claim 1 in which the swirl creation means comprises two flat plates each positioned in its cyclone tube at an angle to the longitudinal axis thereof and on opposite sides of the tube.

3. A cyclone tube as claimed in Claim 2 in which each plate extends through an arc of 1800.

4. A cyclone tube as claimed in either Claim 2 or 3 in which each plate is positioned through a slot in the wall of the cyclone tube and abuts and is secured to the wall of the vortex tube.

5. A separator comprising one or more cyclone tubes as claimed in any of the preceding claims.

6. A separator as claimed in Claim 5 comprising a number of cyclone tubes arranged within an encompassing vessel with their axes parallel, an inlet chamber at the top of the separator communicating with the open top of each cyclone tube with the vortex tubes of each cyclone tube extending up across the inlet chamber through a top plate thereof to an outlet chamber.

7. A cyclone tube substantially as hereinbefore described with reference to Figure 1 of the accompanying drawings.

8. A separator substantially as hereinbefore described with reference to the accompanying drawings.