CN1186457A

CN1186457A - Cyclone

Info

Publication number: CN1186457A
Application number: CN 95197873
Authority: CN
Inventors: C·哈尔丁; L·E·约翰森; H·沙罗
Original assignee: ABB Flaekt AB
Current assignee: ABB Technology FLB AB
Priority date: 1995-05-30
Filing date: 1995-05-30
Publication date: 1998-07-01

Abstract

The vortex separator for treating dust containing gas flow includes a vortex chamber having a circular section and an axis perpendicular to the section, and a central channel having a circular section and mounted to the upper of the vortex chamber, coaxial to the vortex chamber. A slender inserting member is arranged within the central channel from the upper of he channel to the lower to form an annual gap of which the sectional area is, preferentially, not increased along the direction of the gas flow.

Description

Cyclone separator

The present invention relates to a kind of cyclone separator that is used to handle dust-contained airflow, the spin chamber that this cyclone separator comprises a cross section circle with a vertical axis is arranged, there is an airflow inlet spin chamber, be used for air-flow is essentially horizontally introduced the spin chamber, with a bottom dust export is arranged, be used for removing the dust of in the spin chamber, separating from air-flow, and the center tube that comprises a cross section circle, it is located at the top of spin chamber coaxially, and its lower end constitutes the air-flow lower inlet and its upper end constitutes the outlet of air-flow top.

This type of cyclone separator for example is used in the dedusting of the drying plant of paper pulp or some other fiber pulp, and the air stream that contains dust such as fiber flows through cyclone separator, in order that remove dust.

Cyclone separator is subjected to judder during work, and especially for large-sized cyclone separator, this vibration may cause shaking splitting.This vibration may come from the flow phenomenon of a kind of PVC of being called (precession vortex core-Precessing Vortex Core), and by A.K.Gupta, 191 to 198 pages (1984 by ABACUSPRESS at " Swirl Flows " for D.G.Lilley and N.Syred, Massachusetts, USA publishes) in made more detailed description.

The purpose of this invention is to provide a kind of cyclone separator, wherein do not have the PVC phenomenon, and therefore avoided vibration problem, or reduce at least significantly.

By the present invention is the cyclone separator by means of the described type of a kind of preface of achieving the above object, it is characterized in that an elongated plug-in part, this plug-in part vertically inserts center tube, and be designed to entreat hereinto by this way in the pipeline from its upper end and extend downwards, promptly, form an annular gap between plug-in part and center tube, this gap preferably has a constant cross-sectional area, that is does not increase along airflow direction.

In a kind of most preferred embodiment, plug-in part stretches out a distance above center tube.

Plug-in part preferably extends downwardly into the lower end of center tube.

In a kind of most preferred embodiment, plug-in part is rotational symmetric and preferably inserts center tube coaxially.

Plug-in part is preferably hollow.Hollow plug-in part in the top and/or the lower end calotte is arranged.

Illustrate in greater detail the present invention with reference to the accompanying drawings, accompanying drawing has schematically illustrated by cyclone separator of the present invention vertical section vertically.

The cyclone separator of representing among the figure comprises spin chamber 1 a cross section circle and that a vertical axis is arranged.The horizontal inlet pipe 2 that constitutes the air-flow upper inlet tangentially extends in the spin chamber its top basically.Be provided with air blast (among the figure not expression), so that with the air-flow F of dust-laden, for example fibrous air stream sprays into spin chamber 1 through inlet tube 2.

In represented embodiment, spin chamber 1 comprises a cylindrical part 3; A truncated cone part 4 that is connected with the bottom of cylindrical part; A cylindrical part 5 that is connected with the bottom of truncated cone part 4; A truncated cone part 6, it is connected and constitutes the top of spin chamber 1 with the top of cylindrical part 3.Spin chamber's

part

3,4,5 and 6 is arranged coaxially.Bottom 5 constitutes a bottom dust outlet, is used for removing dust or the particle separated from air-flow in spin chamber 1, for example fiber.

The center tube 7 of cross section circle is contained in the cylindrical part 3 of spin chamber 1 coaxially.And extend to outside the spin chamber 1 by the truncated cone part 6 of spin chamber.Center tube 7 comprises a cylindrical tubular part 8 and a truncated conical pipe part 9 that is connected its lower end.Center tube 7 constitutes a gas lower inlet in its lower end, constitutes a gas top outlet in the top.

So far illustrated cyclone separator is the cyclone separator of traditional type.Its function is known the expert, therefore explains no longer in more detail.

The elongated plug-in part 10 of a cross section circle is arranged in the center tube 7 coaxially.Plug-in part 10 comprises a cylindrical tube part 11 and a continuous tapering part 12 in its lower end.The lower end of the upper end of tubular portion 11 and tapering part 12 that is the vertex of a cone are positioned at respectively on the residing same height in top and bottom of center tube 7.Turning point between the turning point between the

part

8 and 9 of center tube 7 and the

part

11 and 12 of plug-in part 10 is positioned substantially on the same height.

Plug-in part has a taper calotte part 13 in the top, and it stretches out on center tube 7 upper ends.About 90 ° of the cone angle of calotte part 13.

Plug-in part 10 is fixed in the center tube 7 by means of three groups of radial arms that traverse 14,15,16, and they are connected on the center tube 7, that is, one group of upper arm 14, they are connected the turning point place between its tubular portion 11 and calotte part 13 on the plug-in part 10; Arm 15 in the middle of one group, they are connected the turning point place between two

part

11 and 12 on the plug-in part 10; And one group of underarm 16, they are connected its lower end that is vertex of a cone place on the plug-in part 10.

Plug-in part 10 sizes design and installation so promptly, form an annular gap 17 between plug-in part 10 and center tube 7 in center tube 7.Gap 17 is on center tube 7 tops that is the size between the cylindrical tubular part 11 of the cylindrical tubular part 8 of center tube 7 and plug-in part 10, diameter D1 by tubular portion 11 in illustrated embodiment determines with the ratio of the diameter D2 of tubular portion 8, this ratio preferably adopts 0.3＜D1/D2＜0.9, especially 0.63＜D1/D2＜0.73.The truncated conical pipe part 9 of center tube 7 and the tapering part 12 of plug-in part 10 have such cone angle, that is, the cross-sectional area that they make gap 17 is along the whole length of

part

9 and 12 and thereby be essentially constant along the whole length of center tube 7 and plug-in part 10.

By using the plug-in part of said structure mode, just might eliminate the described vibration problem that in the cyclone separator of prior art, causes of preface owing to the PVC phenomenon.

Two parts 11 of plug-in

part

10 and 12 are extended along the total lengths of center tube 7 jointly among Biao Shi the embodiment in the drawings.Yet this is not mandatory.The tubular portion 11 that main points are plug-in part 10 begins (as shown in the figure) or the high level that is omitted begins to entreat hereinto in the pipeline 7 to extending down from place, center tube 7 upper end height, and it is not more than 3D2 to the distance at height place, place, center tube 7 upper end.Do not comprise taper calotte part 13 but comprise that cylindrical tube part 11 may stretch out the total length of the part of center tube 7 upper ends (this part is zero in for example illustrated) at interior plug-in part 10, that is L1+L2, wherein L1 is that the length and the L2 of pipe part 11 are the length of tapering part 12, preferably adopt train value: L1+L2＞3.0D2, especially L1+L2＞3.55D2 down.

Above-mentioned cyclone separator can be made various modifications within the scope of the invention.For example, plug-in part 10 does not need to establish the calotte part, and such as the following calotte part of calotte part 13 and tapering part 12 formations, but it can have the shape of the pipe of one or both ends opening.Plug-in part 10 also can be a solid.In addition, plug-in part can only be grouped into by a cylindrical portion, or a tapering part or a truncated cone part.Be also pointed out that under following situation and can obtain gratifying effect equally: plug-in part 10 is not rotational symmetric and/or plug-in part is contained in the center tube 7 not exclusively coaxially or not exclusively symmetrically.By the above obvious gap 17 so long as the annular it shape quite arbitrarily can be arranged.Yet should point out emphatically, the gap does not allow this shape, that is, and and along flow direction that is the upwards cross-sectional area increase of air-flow in the gap.Therefore importantly avoid gas to pass through pressure recovery in the Clearance Flow process.

Claims

1. handle the whirlwind current divider of dust-contained airflow (F), it comprises spin chamber (a 1) cross section circle and that a vertical axis is arranged, the spin chamber has an airflow inlet (2) to be used for air-flow essentially horizontally being introduced spin chamber (1) and having a bottom dust outlet (5) to be used to remove the dust of separating from air-flow in the spin chamber, and, the center tube (7) that comprises a cross section circle, it is arranged on the top of spin chamber (1) coaxially, its lower end constitutes the lower end import of air-flow and the top outlet that its upper end constitutes air-flow, it is characterized by: vertically in center tube (7), insert an elongated plug-in part (10), it is designed to entreat hereinto by this way in the pipeline (7) extends downwards from its upper end, promptly, formed an annular gap (17) between plug-in part (10) and center tube (7), this gap (17) has a cross-sectional area that does not increase along airflow direction.

2. according to the described cyclone separator of claim 1, it is characterized by: gap (17) have constant basically cross-sectional area.

3. according to claim 1 or 2 described cyclone separators, it is characterized by: plug-in part (10) stretches out a distance above center tube (7).

4. according to each described cyclone separator in the aforementioned claim, it is characterized by: plug-in part (10) extends downwardly into the lower end of center tube (7).

5. according to each described cyclone separator in the aforementioned claim, it is characterized by: plug-in part (10) is rotational symmetric.

6. according to the described cyclone separator of claim 5, it is characterized by: plug-in part (10) is inserted in the center tube (7) coaxially.

7. according to each described cyclone separator in the aforementioned claim, it is characterized by: plug-in part (10) is hollow.

8. according to the described cyclone separator of claim 7, it is characterized by: hollow plug-in part (10) has a calotte (13) in the top.

9. according to claim 7 or 8 described cyclone separators, it is characterized by: hollow plug-in part (10) has a taper calotte (12) in its lower end.