Liquid purification or separation – Processes – Separating
Patent
1986-07-15
1988-04-26
Sever, Frank
Liquid purification or separation
Processes
Separating
210160, 210328, 210401, B01D 3332
Patent
active
047403160
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of and apparatus for filtering material from a fluid stream containing such material.
The material filtered from the fluid stream which may be a gaseous fluid or a liquid fluid usually comprises solid state particles. The material extracted, however, may include material of quasi solid form such as gel particles or globule particles of a fluid, more viscous than that which forms the main stream of fluid to be filtered and which may either be intrinsically able to coalecc into such globule particles or adhere to solid state particles. The term "extracted material" as used herein includes both solid state and quasi solid material. The maximum cross-sectional size of passageways afforded by a primary filter member incorporated in the filtering apparatus is determined by the average size of the particle which it is desired to filter from the fluid stream.
One of the problems encountered in methods of an apparatus for filtering is that the passageways afforded by the filter member become blocked or clogged by extracted material. This is especially the case if the fluid to be filtered contains particles having a wide spectrum of sizes because the passageways in the filter member may quickly become blocked initially by larger sized particles. If this clogging occurs, the filter member may thus filter from the fluid stream, particles of smaller size than the passageways in the filter member.
Eventually the clogging results in the severe reduction of the rate of flow of the fluid to be filtered through the primary filter member, and possibly preventing such flow altogether.
Further, filtering apparatus are known which have a secondary filter, finer than the primary filter, to filter fine particles which pass through the primary filter member, from the fluid stream. Such secondary filters also become clogged, in use.
Thus it is often the case that filter members require to be subjected to action to remove extracted material therefrom.
The object of the present invention is to provide a method and a form of filter member which facilitates this operation.
According to one aspect of the invention, we provide a method of filtering utilising a filtering apparatus having at least one filter member presenting a plurality of flow paths therethrough of a form to retain, in use, at least a portion of material to be extracted (herein called the extracted material) from a stream of fluid to be filtered, characterised in that said method comprises the steps of passing a stream of fluid to be filtered through the filter member with the filter member in a filtering position, moving the filter member out of the fluid stream, changing the orientation of the filter member under gravity, to remove extracted material from the filter member.
Because the change in orientation of the filter member is achieved under gravity, there is no necessity to provide any method step or means, for acting on the filter member to cause said change in orientation although as described below the filter member may be flushed if required.
It will be appreciated that as the orientation of the filter member is changed, extracted material collected by the primary filter member is removed from the filter member, as the geometry of the filter member will change.
From a second aspect, the invention resides in the provision of a filtering apparatus for filtering material from a stream of fluid to be filtered, said apparatus comprising at least one filter member which, when in a filtering position, presents a plurality of flow paths therethrough to the stream of fluid, means to move the member out of the stream of fluid, means to change the orientation of the filter member under gravity from the filtering position in which the member presents constriction to said fluid in a forward direction so that material is extracted from the fluid by the filter member, to another position wherein extracted material is removed from the filter member.
The filtering apparatus may have a plurality of filter members provided, each comprising a se
REFERENCES:
patent: 1910860 (1930-10-01), Sayers
patent: 4059527 (1977-11-01), Bahr
Paul de la Pena Limited
Sever Frank
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