Gas separation – With means securing or retaining separating media – Unit or cohesive sheet-like media in flow line or frame
Patent
1989-06-27
1990-07-24
Hart, Charles
Gas separation
With means securing or retaining separating media
Unit or cohesive sheet-like media in flow line or frame
55521, 2104931, B01D 4612
Patent
active
RE0332720
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter cartridge for filtering apparatuses for the removal of impurities from hot and/or highly pressurized, flowing gases, with zig-zag formed, folded, gas-penetrated filter material whose part surfaces, caused by the folding, between the fold lines, are arranged in relatively close juxtaposition to each other resulting in acute angles at the fold lines.
With the filter cartridges in question, phenolic resin-saturated fiber materials are used, in particular gas-permeable papers, fibrous webs of various types, which consists of zig-zag formed, folded strips of this material. The stability of the filter material depends on the actual material used. Filter materials of temperature-sensitive material lose stability with increasing temperature which gives disagreeable results, especially when under certain operating conditions as a result of the no longer existing stability of the filter material or the fold, the part surfaces of the filter material between the individual fold lines touch each other and possibly adhere to each other. This results in the whole active filter surface being more or less severely reduced, which leads to a considerable reduction in the performance of the filter.
The aforementioned shortcomings occur particularly when in the scope of a back cleaning of the filter material said material is subjected to a gas flow impulse in the opposite direction.
In order to counteract the aforementioned disadvantages, filter materials of paper were given a stamp with knobs or the like, which, however, are only able to be of effect for the duration of their stability. With the filters is question it provided that with higher temperatures of the gas-flow to be cleaned, the filter material is so strongly heated and softened that the knobs lose their original form and/or are pressed flat by the adhering part surfaces of a fold. This results in paper and similar filter materials being unsuitable for the filter cartridges in question. The most advantageous are webs of fibrous material which, however, on the other hand, have the disadvantage of not being stable enough in shape.
The invention is based on the task of providing a filter cartridge for filter apparatuses which does not have the aforementioned disadvantages and with which a collapsing of neighbouring part surfaces of the filter material of a fold is avoided, with the efficiency of the filter being impaired to the slightest possible degree, if at all, and which stands up to the occurring strains in all operating conditions, i.e. especially with all possible temperatures and pressures of the gas-flow to be cleaned.
For solving this task it is suggested according to the invention, to form the filter cartridge for filtering apparatuses in question in such a way that in the space between two respective adjacent part surfaces of the filter material, a preferably thin-walled plate, which can be referred to as a strip, is arranged whose one edge in the inside of the fold is rectilinear and the other, opposite-lying edge is of zig-zag formation and that the bend or crest lines between the two leading edges steadily rise towards the medial plane of the plate.
Further features of the filter cartridge formed according to the invention are to be taken from the subclaims and from the following description of a preferred embodiment of the subject matter of the invention which is shown in the FIGS. 1 to 3 of the drawing:
FIG. 1 is a perspective view of a plate to be laid in a fold between two part surfaces of the zig-zag folded filter material;
FIG. 2 is a section through a fold of the zig-zag folded filter material in which a plate according to FIG. 1 has been placed;
FIG. 3 is a top view on the open side of the fold of the filter material according to FIG. 2.
As FIG. 2 shows, the filter material 11 of a filter cartridge of customary design, placed in filtering apparatuses, is zig-zag folded, with the material extending from the fold lines at acute angles. The zig-zag folded filter material can be arranged along a straight line, a cu
REFERENCES:
patent: 2410371 (1946-10-01), Vokes
patent: 3199275 (1965-08-01), Fesco
patent: 3410062 (1968-11-01), Hart
patent: 4560477 (1985-12-01), Moldow
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