Method of operating a centrifugal filter and a filter centrifuge operating according to this method
AssigneeKrauss-Maffei Aktiengesellschaft
InventorsGunther Hultsch, Kurt Zeppenfeld, Peter Niedner, Peter Ostermeyer
Life of this patent
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Abstract
A method of operating a filter centrifuge or centrifugal filter in which a hydrostatic head is provided at the filtering surface so as to control liquid passage therethrough. The head may promote movement of the liquid through the filter layer or may induce reverse flow of liquid for backwashing or rinsing. In addition, a hydrostatic balance may be provided at this surface through control of the head to limit passage of the liquid through the filter layer. Preferably the head provides a suction augmenting centrifugal filtration.
Claims8
A filter centrifuge comprising:
- a perforated drum rotatable about an axis;
- means forming an annular chamber around said drum and rotatable therewith;
- pump means for evacuating said chamber to withdraw air therefrom;
- means for rotating said drum about said axis to displace said liquid phase through said filter cake;
- and
- means for forming a continuum consisting of liquid which radiates outwardly through said drum;
- said drum being adapted to form a filter cake through which a liquid phase can pass outwardly into said chamber with a hydrostatic pressure determined by the rate at which liquid of said continuum is withdrawn from said chamber.
A method of operating a filter centrifuge comprising a perforated drum rotatable about an axis and formed with a filter medium upon which a filter cake can form during filtration, said drum being surrounded by a liquid-collecting compartment rotating together with said drum and having at least one outlet radially outwardly of said filter medium, said method comprising the steps of:
- rotating said drum about said axis at a rate sufficient to induce passage of a liquid phase of a suspension outwardly through said filter medium into said liquid-collecting compartment;
- initially forming a liquid suction-pressure head within said liquid-collecting compartment;
- withdrawing air from said liquid-collecting compartment;
- and
- maintaining the liquid suction-pressure head so as to produce a continuum consisting of liquid, which radiates outwardly through said drum, resulting from said rotating.
Dependencies are inferred from the claim text.