Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1998-03-10
1999-07-13
Woo, Jay H.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210791, 210106, 210112, 210407, 210418, B01D 2962
Patent
active
059222085
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for filtering out of a liquid at least one solid substance comprised therein with essentially tube-shaped filter means, said method comprising consecutively: said filter means; remains in said filter means as residue; draining away said liquid via drain means; and filtering and axially opposite said supply means.
Such a method is known from the Dutch patent application 71.11921, where a filter device is described, to which discharge means is connected having a diameter corresponding to that of said filter means.
After opening of said closeable discharge means said filter means is rinsed, which is known as the so-called "blow-down"-process. This process is performed with fluid to be filtered, where as a result efficiency and performance of such a method remain low.
Another disadvantage of said. known method is, that it is inevitably required to interrupt said known filter method in order to rinse said filter.
The invention has for its object to obviate the above stated drawbacks and provides for this purpose a method, which is distinguished by: compressing a predetermined amount of residue to the shape of mainly a solid bar under the influence of pressure in said supplied liquid, when filtering; liquid.
By performing a method according to the present invention a compact accumulation of residue formed during a filtering process under pressure from the supplied flow of liquid is ejected in its entirety by opening the closeable second discharge means, whereafter the filtering process can be immediately resumed. To this end it is not required to interrupt the flow of fluid to be filtered or the filtering process itself.
In a first preferred embodiment of a method according to the present invention such a method is distinguished by measurement of said pressure exerted by-said fluid on said bar while filtering, in order to open said discharge means when a predetermined value of said pressure is attained.
As a result with a method according to this embodiment a minimum amount of fluid to be filtered is lost when removing said residue.
In a second preferred embodiment of a method according to the present invention such a method is distinguished by performing a pound or shake process on said filter means, if said pressure in said filter means is inadequate or if a time span between opening of said discharge means and the moment in time, where said bar starts to move, exceeds a predetermined value.
As a result such a method according to this second embodiment is extremely reliable in that the bar of residue formed in said filter means is with certainty removed before said discharge means is brought into a closed state thereof. The bar of residue is with certainty removed before said closing of said discharge means and damaged to said discharge is avoided.
In a third preferred embodiment of a method according to the present invention such a method is distinguished by setting a length of said bar of residue to be formed in said filter means by covering passages for said fluid in said filter means along at least a part of the length of said filter means.
As a result factors contributing to friction between said bar and said filter means can be taken into account by setting the length of the bar to be formed. Such factors may comprise temperature, roughness of the inner surface of said filter means, roughness of the outer surface of the bar to be formed, etc.
It is noted here, that the invention also relates to a device for performing a method according to the present invention, and particularly the second and third preferred embodiments thereof described above.
The invention will be elucidated further with reference to the figure description hereinbelow of a number of embodiments of the invention. In the drawing:
FIG. 1 shows a partially cut away perspective view of a first embodiment of a filter device according to the present invention;
FIG. 2 is a partially cut away perspective view of a second embodiment of a filter device according to the present invention;
FIG. 3 is a part
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patent: 5328617 (1994-07-01), De Haan et al.
patent: 5362403 (1994-11-01), Dosoudil
patent: 5547624 (1996-08-01), Shah
International Search Report.
Defil N.V. Holland Intertrust (Antilles) N.V.
Lawrence Frank M.
Woo Jay H.
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