Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-04-02
1991-08-20
Hart, Charles
Gas separation
Means within gas stream for conducting concentrate to collector
55188, 55233, 55444, 55446, B03C 301
Patent
active
050411462
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter apparatus for filtering solid, liquid or gaseous, electrically charged or electrically uncharged particles out of a gaseous flow medium which flows through the filter apparatus, comprising filter elements which are spaced from each other in the direction of flow of the gaseous medium to the filter apparatus, wherein each filter element has a plate-like carrier element with spaced-apart openings therethrough, the openings of adjacent plate-like carrier elements are displaced relative to each other in such a way that they are not aligned with each other, and each plate-like carrier element has at least on its upstream side a substrate which is provided for the storage of a filter medium and which is provided with openings corresponding to the openings in the associated plate-like carrier element.
A filter apparatus of that kind is known from DE 36 37 428 Al. In that arrangement the substrate which is provided for storage of the filter medium comprises for example a foam material. The carrier elements for the substrates may also be formed from a plastics material. That known filter apparatus uses in particular glycerine, to which further substances may be added, as the filter medium.
DE 37 11 294 Al describes a filter apparatus of the kind set forth in the opening part of this specification, in which the filter medium used is for example glycerine or glycol or mixtures of those substances. In that known filter apparatus the filter medium is passed from a collecting container in a circuit to the spaced-apart filter elements which are arranged in succession in the direction of flow of the gaseous medium to the apparatus. For that purpose, the apparatus has a conveyor means for the filter medium. The plate-like carrier elements of the individual filter elements are preferably in the form of plastics carrier plates, with the substrates for storage of the filter medium being disposed on the upstream sides thereof. The substrates are preferably in the form of foam plates.
In all those known filter apparatuses, the openings in the individual filter elements are in the form of through slots.
It has been found that the filter action of such filter apparatuses, with a given flow rate in respect of the gaseous flow medium to be filtered, through the filter apparatus, is better for heavy particles which are to be filtered than for light particles which are to be filtered. Furthermore, when carrying out operational tests in respect of such filter apparatuses, it was found that the filter effect increases with an increasing rate of flow of the gaseous flow medium to be filtered, both for light particles to be filtered and also for heavy particles. That means however that a relatively high rate of flow of the gaseous flow medium through the filter apparatus is a desirable aspect. The rate of flow of the gaseous flow medium has hitherto been limited in an upward direction by virtue of the fact that, at very high flow rates, particles of the filter medium can be entrained with the gaseous flow medium which flows through the filter elements. That has at least an adverse effect on the desired filtering or cleaning action of the filter apparatus.
The invention is therefore based on the problem of so improving a filter apparatus of the kind set forth in the opening part of this specification, with simple means, that the filter or cleaning action of the filter apparatus is further improved.
In accordance with the invention, that problem is solved in that the/each plate-like carrier element comprises a material which is impervious in relation to the filter medium, and that each opening in the plate-like carrier element has a sleeve-like guide element for the flow medium, which extends around the edge of the opening and which is directed at least approximately normal to the plate-like carrier element.
By virtue of the fact that each plate-like carrier element, with the exception of the openings therein, is impervious to the filter medium, the filter medium is unable accidentally to pass through the
REFERENCES:
patent: 718805 (1903-01-01), Watts
patent: 1521348 (1924-12-01), Ambruster
patent: 4427423 (1984-01-01), Montierth
patent: 4477263 (1984-10-01), Shaver et al.
patent: 4806148 (1989-02-01), Ottengraff
patent: 4938787 (1990-07-01), Simmer-Erlbacher
PCT publication No. WO88/03049, 5-5-88.
Hart Charles
Lillie Raymond J.
Olstein Elliot M.
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