US 4,309,288 AGranted

Rotary drum filter

AssigneeExxon Research & Engineering Co.

InventorsDouglas G. Ryan, Derek J. Watridge

Life of this patent

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Abstract

An improved rotary filter is described. A baffle means is disposed between the filter drum and the filter cloth in substantial alignment with at least some of the circumferential openings in the filter drum to decrease the erosive effects on the filter cloth of fluid discharged through the circumferential openings in the filter drum.

Claims13

Dependent claims

In a rotary filter means of the type comprising:

(a) a filter vat adapted to contain a filterable slurry;
(b) a rotatable filter drum at least partially disposed in said filter vat, said drum having circumferential openings disposed therein in substantial alignment with fluid conduits disposed in said drum, said drum including a filter grid disposed on the outer periphery of said filter drum;
(c) means to rotate said drum in said filter vat;
(d) fluid conduits disposed in said drum in substantial alignment with the circumferential openings in the drum;
(e) a valve means communicating with said fluid conduits for regulation of the fluid flow through said conduits and through the circumferentially disposed openings in said filter drum;
(f) a filter cloth disposed over the circumferential openings in said filter drum and over said filter grid, said cloth maintained in spaced-apart relationship from said filter drum by said filter grid;
and
(g) means for removing the filter cake from the filter cloth, whereby, during one phase of each rotation of said filter drum, slurry is drawn onto the filter cloth with at least a portion of the filtrate passing through the openings into the fluid conduits while the solids form a filter cake on the filter cloth and during another phase of each rotation high velocity fluid passes from the conduit through the circumferential openings to lift the filter cake from the filter cloth, the improvement wherein a baffle means is disposed between the filter grid and the filter cloth in substantial alignment with at least one of the openings in the filter drum said filter cloth communicating with said baffle means and with the filter grid, said baffle means having a surface generally coextensive with the outwardly extending surface of said filter grid to decrease the kinetic energy of the fluid passing from the conduits through at least one of the circumferential openings prior to the fluid contacting the filter cloth to thereby decrease the erosive effects of the fluid on said filter cloth.

5 more elements

Dependencies are inferred from the claim text.

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Abstract

In a rotary filter means of the type comprising:

(a) a filter vat adapted to contain a filterable slurry;
(b) a rotatable filter drum at least partially disposed in said filter vat, said drum having circumferential openings disposed therein in substantial alignment with fluid conduits disposed in said drum, said drum including a filter grid disposed on the outer periphery of said filter drum;
(c) means to rotate said drum in said filter vat;
(d) fluid conduits disposed in said drum in substantial alignment with the circumferential openings in the drum;
(e) a valve means communicating with said fluid conduits for regulation of the fluid flow through said conduits and through the circumferentially disposed openings in said filter drum;
(f) a filter cloth disposed over the circumferential openings in said filter drum and over said filter grid, said cloth maintained in spaced-apart relationship from said filter drum by said filter grid;
and
(g) means for removing the filter cake from the filter cloth, whereby, during one phase of each rotation of said filter drum, slurry is drawn onto the filter cloth with at least a portion of the filtrate passing through the openings into the fluid conduits while the solids form a filter cake on the filter cloth and during another phase of each rotation high velocity fluid passes from the conduit through the circumferential openings to lift the filter cake from the filter cloth, the improvement wherein a baffle means is disposed between the filter grid and the filter cloth in substantial alignment with at least one of the openings in the filter drum said filter cloth communicating with said baffle means and with the filter grid, said baffle means having a surface generally coextensive with the outwardly extending surface of said filter grid to decrease the kinetic energy of the fluid passing from the conduits through at least one of the circumferential openings prior to the fluid contacting the filter cloth to thereby decrease the erosive effects of the fluid on said filter cloth.

5 more elements