DE1241243B - Dust gas filter with filter boxes and fillings made of grainy filter material - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

SUTSCHES

PATENT OFFICE

EDITORIAL

Int. Cl .:

BOId

German class: 5Oe -4/01

Number:
File number:
Registration date:
Display day:

1241243
L43236III / 50e
October 18, 1962
May 24, 1967

The invention relates to a dust gas filter with one or more housing chambers and therein side by side, narrow, upright filter boxes with gas-permeable bottoms and Fillings made of granular filter material, which move from obsn down from dust gas and periodically for cleaning of the filter material flows through in the opposite direction by a flushing flow (clean gas or outside air) will.

In order to remove dust from hot dust gases, the procedure has already been followed by closing a filter housing in chambers subdivide, in which filter boxes with several granular bottoms filled above gas-permeable bottoms Filter material layers are provided at intervals one above the other, from the bottom up from the dust gas are flowed through, with the cleaning of the granular filter material in each case after The dust gas exposure is switched off by shaking the filter boxes. The dust is supposed to be sink down through the stacked filter layers into a dust collecting room.! This kind the cleaning causes difficulties and will also take considerable time, since this is the Dust from the topmost filter layer must pass through all of the filter layers below.

It is also known to have a granular filter layer over a gas-permeable one in two filter chambers To arrange the floor, these chambers alternating from top to bottom by means of a flap control charged with dust gas and after switching off the dust gas flow for cleaning from below clean air flows through the top, which loosens the dust from the granular filter material and pulls it along with it which then has to be discharged with the dust through a separate line.

After all, it is also known in one; Filter chamber an annular filter box, which is divided into sectors by radial walls and with a granular Filter material is filled between a gas-permeable base and cover, in constant circulation around a vertical axis, whereby the champagne oven of be exposed to dust gas from top to bottom and one after the other within a chamber department clean air flows through it in the opposite direction from bottom to top, through which the granular The filter material is freed from adhering dust. To achieve greater filter performance are included to move significant weights rotating, with complicated seals of the annular filter box against the housing are required if major clean gas losses are avoided during cleaning should.

Dust gas filter with filtej boxes and fillings granular filter material

Applicant:

to Alice Lühr, née Gerken,

Stadthagen, Pastor-Walzberg-Str. 10

Named as inventor:

Heinrich Lühr, Stadthagen

The invention is intended to avoid the disadvantages of such known dust gas filters, and it

_5 is to be achieved above all, iJass many filter boxes to achieve an arbitrarily large siaubgas throughput can be accommodated in the smallest of spaces, with a periodic cleaning with relatively small amounts of flushing gas is possible without reducing the dust removal rate of the dusting gas filter is decreased.

To solve this problem », it is provided according to the invention that in the aforementioned dust

;. gas feed the gas-permeable bottoms of all filter boxes -connected by means of a gas line shoe to parallel slots provided in one chamber wall and through these slots with a clean gas collecting channel arranged horizontally outside the chamber wall are connected, in which in a known manner a back and forth purge gas nozzle Slits covered one after the other.

This solution ensures that all filter boxes fixed in a parallel position and therefore perfectly sealed in the filter chamber can be, and that as a result of the separate connections of all filter boxes to a common clean gas duct the cleaning of the box fillings one after the other in the manner known from pocket filters which can take place in the clean gas channel through the chamber wall slots. Consequently all parts are fixedly arranged within the filter chamber, and the movable part only exists

709 587/128

Claims (2)

from the back and forth purging gas nozzle, whereby it is possible to install and remove the individual filter boxes in a simple manner in the event of damage. Furthermore, the filter material can now be cleaned simply by countercurrent flushing, with the cleaning dust emerging from the top of the filter box with the flushing gas and then sinking down into the dust collection space of the filter chamber. It is understandable that the solution according to the invention significantly reduces the height of the filter housing and the performance of the dust gas filter can be increased as desired by increasing the number of filter boxes arranged in parallel next to one another accordingly. Furthermore, switching and control elements compared to known systems are avoided within the filter chambers. An embodiment of the invention will now be explained in more detail with reference to the drawing, namely, FIG. 1 shows a vertical section through a filter chamber with a clean gas duct and a filter box according to the invention, FIG. 2 shows the same section, but with the purging gas nozzle in the clean gas duct just in front of a wall slot, FIG. 3 shows a cross section through a filter box with an additional upper hood when the filter box is switched to dedusting, FIG. 4 shows the same cross section through a filter box which is switched to flushing. A dust gas filter according to the invention has a housing with one or more filter chambers 1, expediently arranged in a row. The dust gas is fed to the chamber 1 in the usual way via an inlet space 2 with suction nozzle 3 from above; however, a side feed is also possible. One vertical chamber wall 1 a is provided with a horizontal row of vertical slots 4 which are connected to an external clean gas duct 5 to which a dust gas suction fan is connected to the nozzle 6. In the clean gas duct, a purging gas slot nozzle 7 moves horizontally back and forth, covering the slots 4 one after the other 9 is blown to clean the filter material 17 filled into it. Each rigid filter box 9 has gas-tight side walls 10 made of sheet metal or another suitable material; it is open at the top and designed in its lower part as a gas line shoe 11, the sole 12 of which runs straight or curved in an inclined manner in the direction of the lower edge of the slots 4. The end wall 13 of the filter boxes 9 facing the clean gas channel 5 is provided with a slot 14 in the region of the shoe 11, which slot 14 coincides with a slot 4 in the chamber wall 1 a. Above the slot 14 in the filter box 9 there is a gas-permeable intermediate floor 16 made of sieve plates, mesh fabrics or the like. A sieve-like cover 15 can be placed on the edge of the box. In the filter boxes 9, a layer 17 of granular material, for. B. sand, kieselguhr od. During operation, the dust gas flows through the granular filter layer 17 from top to bottom and is discharged as clean gas through the shoe 11, the contactors 14 and 4 and the clean gas duct 5 via the suction gas fan. The dust that collects more and more in the filter material filling 17 is periodically removed by countercurrent flushing. For this purpose, the moving purging gas slot nozzle 7 blows purging gas from below through the filter material filling 17 of the relevant filter box 9 when it overlaps with a slot 4. The granular filter material is whirled up, so that the flow resistance is reduced and the individual granules are rubbed against one another and properly freed from the adhering dust. So that the blown dust can sink unhindered into the collecting funnel 18 next to the filter box, it is advisable to cover the wall slots 4 for the two adjacent filter boxes with lateral lips or flanges of the purging gas nozzle 7. In order to avoid this switching off of the two adjacent filter boxes and thereby to keep the capacity of the filter chamber as high as possible, one can proceed in place of the slot cover in such a way that one can proceed according to FIG. 3 and 4 a roof-shaped hood 19 is arranged above each filter box 9, which cover extends over the upper longitudinal edges of the box with lateral spacings. This hood 19 is provided on the inside of its roof surfaces with a pendulum flap 20 hinged at the top to cover openings 21. When dedusting, the flaps 20 swing inward and open the openings for the flow of dust air to the filter box. In order to prevent dust air from flowing into the hood 19 from below, aprons 22 made of flexible material or thin, flexible sheet metal are attached to the lower edges of the hood on both sides Place box 9. When purging occurs according to Fig. 4, the purge air in the direction of the arrow from bottom to top through the filter layer 17 in the hood 19, so that the pendulum flaps 20 from the inside against the roof surfaces of the hood and close the openings 21 while the Spread the aprons 22 from the side surfaces 10. As a result, the flushing gas flow is deflected downwards so that the dust can sink freely downwards. Patent claims: 1. Dust gas filter with one or more housing chambers and arranged side by side therein narrow, upright filter boxes with gas-permeable bottoms and fillings Made of granular filter material that is cleaned from the top down from the dust gas and periodically of the filter material in the opposite direction from a purge flow (clean gas or outside air) are flowed through, characterized that the gas-permeable bottoms (16) of all filter boxes (9) each by means of a gas line shoe (11) connected to parallel slots (4) provided in one chamber wall (la) and through these slots with a clean gas channel arranged horizontally outside the chamber wall (5) are connected, in a known manner a back and forth purging gas nozzle 1 (T) the slots one after the other over ^deck * 2. Dust gas filter according to claim 1, characterized in that that the level surfaces of the filter material fillings (17) at a distance below the upper edges of the filter boxes (9). Documents considered: German Patent No. 579024; French Patent No. 1140 347; British Patent Nos. 308 790, 838 225. Older patents considered: German Patent No. 1146 339. 1 sheet of drawings 709 587/128 5.67 © Bundesdruckerei Berlin