CH616599A5 - Filter apparatus having granular filter material - Google Patents

Description

The invention relates to a filter apparatus with granular filter material, which fills the interior of the filter between a housing shell and a perforated inner tube arranged therein, wherein in the extension of the perforated inner tube, a drainage opening for the filter material, which is delimited by a seat ring, is provided, which is provided by an on the Seat ring lying on and removable from this closure member can be closed.

Filter devices of this type are used, for example, for filtering the chlorine gas in chlor-alkali electrolysis systems, the chlorine gas flowing through the granular filter material used as the filter material. The filter mass will be used up after a certain period of operation and it is therefore necessary to replace it regularly.

Emptying the filter from the filter mass with the help of shovels or similar means is generally not an option because this method of working with large filters and filter masses containing toxic or aggressive substances is cumbersome or dangerous. Solutions have therefore been sought for emptying the filter apparatus using a mechanical emptying device.

In a known filter apparatus of the type mentioned in the introduction, the emptying device is formed by the perforated inner tube itself. This is slidably guided in the filter housing and rests on the ring seat of the drain opening during normal operation, so that it blocks it. To empty the filter, the perforated inner tube is pulled up using a suitable lifting device, thus exposing the drain opening at the lower end of the tube. The used filter mass can then trickle down through the emptying opening into a container underneath and is transported away there.

This known emptying device is characterized by a simple construction, but has the disadvantage that it only works properly if the filter material has particularly good flow properties which enable the long, perforated inner tube to be pulled up.

However, if a filter material is used which has poor flow properties due to the size or shape of its granulation, the grains of the filter material settle into the holes in the perforated tube and prevent it from being pulled up to empty the filter.

The object of the invention is to avoid these disadvantages and to provide a filter apparatus of the type mentioned which, even when filter materials with poor flow properties are used, enables the filter to be emptied in a simple manner and in a simple manner.

This object is achieved according to the invention in that the perforated inner tube is dimensioned shorter at its lower end than the space filled with the filter material and in that the intermediate region formed thereby is closed by an imperforate tube section which is guided in the perforated inner tube and which is in normal operation on the seat ring of the emptying opening rests and can be retracted into the perforated inner tube to empty the filter.

The filter is emptied from the filter mass in a simple manner by pulling up the unperforated pipe section appropriately with a suitable device. Due to its smooth pipe wall, the pipe section remains even with unfavorable, d. H. too large or too angular grain of the filter mass easily movable.

The imperforate pipe section is expediently only slightly longer than the annular gap closed off by it and is provided with a pull rod which is guided in the perforated inner pipe or in its extension. In this way, the friction between the two tubes is kept to a minimum.

It is also advantageous if the non-perforated pipe section is centered in normal operation by a collar adjoining the seat ring. This prevents the unperforated pipe section from tilting during operation.

In the drawing, an embodiment of the subject of the invention is shown and the figure shows a vertical section.

The filter apparatus is particularly suitable for filtering chlorine gas in a chlor-alkali electrolysis plant. 1 denotes a filter housing with an inlet nozzle 2 for the gas to be filtered and a housing cover 3 with a filler nozzle 4 for the filter material. A cylindrical inner jacket 5 made of perforated sheet metal is arranged in the filter housing 1, which ends in a funnel shape at its lower end and is provided with a cylindrical collar 6. On the collar 6, a seat ring 8 surrounding an emptying opening 7 is attached. In the filter housing 1, a perforated inner tube 9 is also arranged centrally and coaxially to the inner jacket 5, which is attached to the housing cover 3 and whose upper end opens into an outlet port 10 for the filtered gas. The length of the perforated inner tube 9 is dimensioned such that an annular gap is formed between the latter and the collar 6 at its lower end.

In the extension of the perforated inner tube 9 and the cylindrical collar 6 there is an emptying nozzle 11 for the filter material, which is closed by a cover 12 in normal operation.

In the perforated inner tube 9, an imperforate tube piece 13 is guided, which rests on the seat ring 8 in the closed position shown and is centered by the collar 6.

The imperforate tube piece 13 is measured somewhat longer than the area between the collar 6 and the perforated inner tube 9, so that in the closed position shown it protrudes somewhat into the perforated inner tube 9, namely far enough to ensure adequate guidance.

The imperforate pipe section 13 is also provided with a pull rod 14 which is centered in the perforated inner pipe 9 by a plurality of uniformly distributed guide arms 15

5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

3rd

616 599

leads is. The imperforate tube 13 can be closed at its lower end with an aperture.

The granular filter material is introduced through the filler neck 4 into the space between the inner jacket 5 and the perforated inner tube 9. The gas to be filtered is fed to the filter apparatus through the inlet connection 2,

then flows through the filter mass 16 and is discharged through the perforated inner tube 9 and the outlet nozzle 10.

If the filter mass 16 is used up, i. H. If their filter properties are already exhausted, they must be removed from the filter apparatus and replaced with new filter material. For this purpose, the outlet opening of the emptying nozzle 11 is uncovered by removing the cover 12 and then the imperforate pipe section 13 is lifted up with the aid of the pull rod 14 and a lifting device, not shown, which engages on this. As a result, the area between the perforated inner tube 9 and the collar 6 is exposed and the filter mass can trickle down through the emptying opening 7 and the emptying nozzle 10. There it is collected in a suitable container and transported away in it.

The emptying device of the filter apparatus described remains operable even with filter materials with poor flow properties, since these even with unfavorable, ie. H. Too large or too angular grain of the filter mass does not affect the mobility of the short, smooth pipe section 13.

s

1 sheet of drawings

Claims (3)

616 599 PATENT CLAIMS 1. Filter apparatus with granular filter material, which fills the interior of the filter between a housing jacket and a perforated inner tube arranged in it, with an extension of the perforated inner tube being provided with a drainage opening for the filter material, which is delimited by a seat ring and which is supported by a seated ring on the seat ring and can be closed by this lifting member, characterized in that the perforated inner tube (9) is dimensioned shorter at its lower end than the space filled by the filter material (16), and in that the intermediate region thus formed is guided by an imperforate tube section (guided in the perforated inner tube) 13) is closed, which rests on the seat ring (8) of the emptying opening (7) during normal operation and can be drawn into the perforated inner tube for emptying the filter. 2. Filter apparatus according to claim 1, characterized in that the imperforate tube piece (13) is provided with a pull rod (14) which is guided in the perforated inner tube (9) or in its extension. 3. Filter apparatus according to claim 2, characterized in that the imperforate pipe section (13) is centered in normal operation by a collar (6) adjoining the seat ring (8).