DE20019834U1 - Guide vane for particle-laden fluid flows - Google Patents

Description

KING ■ PALGEN ■ SCHtiHWÄCH6R .-.'.KUUIT^I.. ¹

DÜSSELDORF■ESSEN

PATENT ATTORNEYS

our reference: 100 385 HS/i7ib E _SE en, 21 November 2000

VSR Industrietechnik GmbH Hingbergstrasse 319

D - 45472 Mülheim/Ruhr Guide vane for particle-laden fluid flows

The invention relates to a guide vane for guiding and deflecting particle-laden fluid flows.

Such guide vanes are used, for example, in industrial furnaces, such as in cement production, to give the fluid flow a certain direction with only low flow resistance, to even out the flow or similar. Depending on the composition, the fluid atmosphere or the properties of the particles, the loading of the fluid guided and diverted in this way with particles often leads to such particles becoming stuck to/on the guide vanes and the guide vanes receiving deposits of these particles, which in extreme cases can lead to blockage of the flow path. It is known from thermal processes - and also in the case of cement production - that when particles are deposited or caked on the inner furnace wall, air-blast-operated fan blow-out nozzles can be used to blow off deposits and caked-on particles from the fluid flow on wall surfaces. Due to their dimensions, these are not suitable for attachment to flow guide vanes. This also applies to the so-called sword nozzles, such as

...ID-.4513.3 ^ _{1 :}

TEL. +49 -jgpft· - 84 g^oi-ip;· FJA^.|49*'-|gC33 ],1&4 gsb'-jgO · E@KPSK.de

| y

D-4O543 DÜSSELDitarfFi.kjaHS&iGftikJäTrtASÖE >^ ^S -"0-40639 ¹ DL)SSELnORF, MULVANYSTRASSE 2"

they are known from DE-C2-37 17 216 because these sword nozzles have a considerable cross-section at their compressed air connection end, which would adversely/unduly influence the flow conditions on a guide vane for particle-laden fluid flows.
5

Based on this, the invention is based on the object of being able to easily remove deposits and build-up of particles present in the fluid from a guide vane of the type mentioned at the beginning, while maintaining the flow expectations placed on the guide vane. If possible, new, preferably existing guide vanes should also be able to be equipped/retrofitted accordingly.

To solve this problem, a guide vane with the features of claim 1 is proposed. In the invention, the known idea of using a cleaning fluid is implemented in such a way that inflow nozzles are arranged in the inflow zone adjacent to the leading edge of the guide vane along the guide vane and the inflow nozzle(s) is/are fluidically connected to a wind box formed on the underside of the guide vane for supplying cleaning fluid. This makes it possible to arrange an interrupted or continuous row of nozzles/nozzle gaps for cleaning fluids in the immediate vicinity of the leading edge in such a way that the guide surface areas of the guide vane that are at risk of particles sticking or caking can be thoroughly cleaned by blowing.

The cleaning effect is achieved consistently across the entire blade width if the inlet nozzle arrangement is constructed according to isobaric design specifications.

The clear cross-section of the so-called wind box required for supplying the cleaning fluid to the inflow nozzles can be realized without causing any significant flow obstruction compared to a

Guide vane without a cleaning device must be accepted. The invention is based on the basic idea of leaving the guide vane, which is exposed to the particle-laden flow, essentially free of disruptive fittings or attachments by forming a flat inflow or wind box on the underside of the guide vane and allowing the cleaning fluid to flow out of the wind box while being diverted to the top of the guide vane.

The aforementioned components to be used according to the invention as well as those claimed and described in the embodiments are not subject to any special exceptional conditions in terms of their size, shape, choice of material and technical conception, so that the selection criteria known in the field of application can be applied without restriction.
15

Further details, features and advantages of the subject matter of the invention emerge from the subclaims and from the following description of the associated drawing, in which - by way of example - a preferred embodiment of the guide vane according to the invention is shown. In the drawing:

Fig. 1A a guide vane in perspective view obliquely from below;

Fig. 1B the same guide vane in perspective view from above;

Fig.2 the same guide vane in plan view from behind;

Fig. 3 the same guide vane in cross section - section along the line

A-A according to Fig. 2;

Fig. 4 the guide vane in the sectional view according to Fig. 3 as a detail

X in two versions a) and b) and

Fig. 5 the guide vane in the sectional view according to Fig. 3 as a detail

Y in three versions a), b) and c).
5

The guide vane shown in Figures 1A and 1B is used to guide and deflect particle-laden fluid flows, e.g. in a gas channel in cement production, with an elongated guide vane 4 bent approximately cylindrically around its longitudinal axis in the form of a correspondingly shaped metal sheet. On the guide vane top 4D shown in Figure 1A, an inflow nozzle arrangement 1 is shown, which in this specific embodiment is provided in the area of the inflow zone 4A of the guide vane in such a way that it consists of a continuous slot-shaped inflow nozzle 1A for cleaning fluid R along the entire guide vane length L of the guide vane 4. The particle-laden fluid flow F guided and deflected by the guide vane 4 strikes the guide vane 4 in the area of the inflow zone 4A. Particles settling from this fluid flow F on the guide vane top side shown in Fig. 1B are blown away in bursts from time to time by the cleaning fluid R.

[The inflow nozzle 1A is supplied with the cleaning fluid R through a wind box 3, which is formed on the guide vane underside 4C shown in Fig. 1A and extends over the entire guide vane length L. This wind box has, starting from its fluid supply end 3B, a free cross-section that decreases in width towards its opposite dead end 3C, as is known per se from sword nozzles according to DE-C2-37 17 216. The supply of cleaning fluid takes place via a pipe and an adapter piece 10, which adapts the pipe cross-section to the wind box cross-section. In contrast to the known sword nozzles, the cleaning fluid is deflected by approximately 180° from the guide vane underside 4C to the guide vane top side 4D in the area of the inflow zone 4A.

The very simple structure of the inflow nozzle arrangement 1, which also allows for retrofitting, is shown in detail in the following description of Figures 2 to 5. In the embodiment shown there and preferred in this respect, the wind box 3 is formed in part by the guide vane 4 itself, namely by part of its underside 4C. A further (second) guide surface 5, which is provided parallel to the guide vane 4 at a lateral distance from it, forms a second side wall of the wind box 3. The upstream end of the wind box 3 is formed by an inflow profile 8, which simultaneously forms the leading edge of the guide vane 4. The inflow profile 8 is followed by a third guide surface 2, which extends parallel to the top side 4D of the guide vane along the edge strip forming the inflow zone 4A. On the side of the guide surface 2 facing the top side 4D of the guide vane 4, this forms the nozzle gap IA together with the immediately adjacent area of the guide vane, with spacers 9 ensuring the uniformity of the nozzle gap and a stable connection between the guide surface 2 and the guide vane 4. A spacer 9 is shown in Fig. 4a) in side view and in Fig. 4b) in longitudinal section. At its rear end 3A of the wind box 3 facing away from the leading edge, a continuous fluid-tight connection is provided between the second guide surface 5 and the guide vane underside 4C, e.g. in the form of a welded connection. Variants can be seen from Figs. 4a) to 4c). However, the wind box can also be extended all the way to the trailing edge of the guide vane. In particular, the guide profile 4 can be designed as a hollow flow profile that encloses or forms the wind box 3. In the embodiment shown, the manufacture and also retrofitting of the wind box is simplified in that the guide surface 2, the flow profile 8 and the guide surface 5 are made from a single sheet metal strip by bending.

The taper of the inflow box is particularly clearly visible in Fig. 2, whereby the cross-sectional taper is not only in the direction of the guide vane width B but also in the direction of the guide vane length L or in both

directions can be realized.

A largely turbulence-free or at least low-turbulence inflow of the cleaning fluid R into the nozzle gap 1A is ensured by a correspondingly shaped inflow edge 16 of the guide vane 4.

While the wind box, as explained in the drawings, can consist of a continuous sheet metal casing, it can also be made up of several segments, in particular those with different radii of curvature. The nozzle gap, designated S in Fig. 4a), can be varied as required. A certain length of this gap in the outflow direction, i.e. between the third guide surface 2 and the guide vane 4, i.e. a certain overlap of these two surfaces, can serve as a labyrinth seal to prevent dust particles from flowing back into the wind box if cleaning fluid does not escape from the nozzle gap.

List of reference symbols

1 Inlet nozzle arrangement 1A Inlet nozzle(s) 2 third guide surface 3 Wind box 3A Windbox rear end 3&Egr;&Idigr; Fluid supply end 3C Dead end 4 vane 4A Inflow zone 4B Edge area 4C bottom 4D Top 5 second guide surface 8th Inflow profile 9 Spacers 10 Adapter piece 16 Inflow edge ß Guide vane width L Guide vane length F-" Fluid flow S Nozzle gap width R Cleaning fluid

• «

·

Claims (11)

1. Guide vane for guiding and deflecting particle-laden fluid flows, in which the inflow zone ( 4 A) of the guide vane ( 4 ) is provided along its length with an inflow nozzle arrangement ( 1 ) for cleaning fluid (R) consisting of a continuous or several spaced-apart inflow nozzle(s) ( 1 A), and the inflow nozzle(s) is/are fluidically connected to a wind box ( 3 ) formed on the underside of the guide vane ( 4 C) for the supply of cleaning fluid. 2. Guide vane according to claim 1, characterized in that the wind box ( 3 ) is formed by a part of the guide vane ( 4 ) and a further (second) guide surface ( 5 ). 3. Guide vane according to claim 1 or 2, characterized in that the wind box cross-section tapers in width along the length of the leading edge. 4. Guide vane according to one of claims 1 to 3, characterized in that the wind box ( 3 ) can be supplied with the cleaning fluid from a front end region (fluid supply end 3 B) of the guide vane via an adapter piece ( 10 ) 5. Guide vane according to one of claims 1 to 4, characterized in that the inflow nozzle(s) ( 1A ) is/are formed between an edge region ( 4B ) of the guide vane ( 4 ) located in the region of the inflow zone ( 4A ) of the guide vane ( 4 ) and a (third) guide surface ( 2 ) parallel thereto. 6. Guide vane according to claims 2 and 5, characterized in that the second and third and possibly further guide surfaces ( 5 and 2 ) are connected to form a flow profile ( 8 ) which deflects the cleaning fluid. 7. Guide vane according to claim 6, characterized in that the second and third guide surfaces ( 5 and 2 ) and the flow profile ( 8 ) consist of a single jacket surface. 8. Guide vane according to claim 6 or 7, characterized in that the inflow edge ( 16 ) of the guide vane ( 4 ) is shaped such that a low-turbulence or turbulence-free inflow of the cleaning fluid is ensured. 9. Guide vane according to one of claims 2 to 8, characterized in that the wind box rear end ( 3 A) is welded to the guide vane underside ( 4 C) or is otherwise sealingly connected. 10. Guide vane according to one of claims 5 or 9, characterized in that spacers ( 9 ) are arranged at a distance from one another in the region of the nozzle arrangement ( 1 ) between the third guide surface and the guide vane ( 4 ). 11. Guide vane according to one of claims 1 to 10, characterized in that the guide vane ( 4 ) and the inflow nozzle arrangement ( 1 ) together with the wind box ( 3 ) form a, in particular curved, guide vane body.