Filter housing

Details Filter housing Filter housing

1994-10-07

1996-05-07

Chiesa, Richard L.

Gas separation

With nonliquid cleaning means for separating media

Cohesive filter media cleaning

55344, 553501, 55419, B01D 2988

Patent

active

055141951

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a filter housing for separating a two-phase mixture consisting of gaseous and solid components, which is divided by a rigid plate provided with openings into a raw gas chamber located at the bottom and a clean gas chamber located at the top above the raw gas chamber, whereby filter elements leading downwards into the raw gas chamber are secured in the openings of the rigid plate, a two-phase flow is introduceable into the raw gas chamber, the clean gas chamber has an outlet located above the filter elements for the gaseous components of the flow freed from the solid components by the filter elements and cleaning devices are associated with the filter elements for flushing out the filter elements.
In filter housings of the specified type (DE-A1-40 29 395; FR-A1-22 44 559), it is important for the two-phase flow to reach the individual filter elements in a uniform manner, for turbulences of the flow to be reduced to a minimum and the flow velocity to have, as far as possible, more or less the same values throughout the filter housing.
This is particularly important for the cleaning of the filter elements by means of a gas pressure pulse directed contrary to the two-phase flow. Such cleaning normally takes place during the operation of the filter housing, whereby the gas pressure pulse is merely applied to some of the filter elements while the remaining filter elements can continue to exercise their filtering function undisturbed. When the solids (dust) which are thereby separated from the filter elements and fall downwards are picked up by the two-phase flow still prevailing in the housing and directed essentially upwards, they will be whirled about, and an undesired resoiling of the filter elements can easily occur.
For this reason, attempts have already been made by using baffle plates, inclined introduction of the two-phase flow into the filter housing, flow distributors and the like to guide the two-phase flow entering the raw gas chamber such that it is, as far as possible, directed in the same direction with the falling dust and prevents this from resoiling the filter elements. Such a "uniform flow guidance" of raw gas and falling dust can be adjusted in a relatively uncomplicated manner in small filter housings having less filter elements. In the case of large filter housings with numerous filter elements, high volume throughputs and/or high pressure losses and dust loads, the problem of resoiling has not so far been solved satisfactorily.
The object of the invention is to design a generic device such that the two-phase flow entering the raw gas chamber of the filter housing is directed essentially downwards and guides dust falling from the filter elements towards the floor of the filter housing.
The object is accomplished in accordance with the invention, in a generic filter housing, in that a pipe system extending at least partially in the interior of the raw gas chamber and branching between the filter elements is provided for receiving the two-phase flow, the pipe system dividing the two-phase flow into at least two partial streams and guiding these partial streams past the filter elements upwards as far as the vicinity of the rigid plate where the partial streams exit through openings out of the pipe system into the raw Gas chamber, and that deflecting means are arranged in the raw Gas chamber in the vicinity of the point of exit of the partial streams out of the pipe system, these deflecting means deflecting the partial streams in the raw Gas chamber freely downwards.


BRIEF DESCRIPTION OF THE DRAWINGS

The following description of a preferred embodiment of the invention serves to explain the invention further in conjunction with the attached drawings. In the drawings:
FIG. 1 shows schematically a filter housing with a pipe system serving to introduce a two-phase flow;
FIG. 2 shows schematically a plan view of a modified pipe system and
FIG. 3 shows schematically a rigid plate provided with openings for supporting filter elements, whereby the filter elements are combine

REFERENCES:
patent: 3464189 (1969-09-01), Mergenthaler
patent: 3865561 (1975-02-01), Osborn
patent: 3923480 (1975-12-01), Visch
patent: 4509963 (1985-04-01), Jackson
patent: 4854951 (1989-08-01), Stephenson
patent: 4865627 (1989-09-01), Dewitz et al.
patent: 4872981 (1989-10-01), Hobson, Jr.
patent: 5167676 (1992-12-01), Nakaishi et al.

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