Back to results
US 4,346,008 AGranted
Rotary drum filter
AssigneeExxon Research & Engineering Co.
InventorsMilton D. Leighton, Douglas G. Ryan
Life of this patent
Estimating the term…
Abstract
An improved rotary drum filter is described. The filter includes a liquid collection means communicating with at least a plurality of fluid conduits. The collection means collect and discharge residual liquid remaining in the fluid conduits during each rotation of the filter drum to decrease the erosive effects of the residual liquid on the filter cloth.
Claims14
In a rotary filter means of the type comprising:
- (a) a filter vat adapted to contain a filterable liquid-solid slurry;
- (b) a rotatable filter drum at least partially disposed in said filter vat and adapted to accept a filter cloth, said drum having circumferential openings therein in substantial alignment with fluid conduits disposed in said 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 said drum, said conduits communicating with a valve means and with a liquid collection means;
- and
- (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;
- the improvement which comprises a vented liquid collection means having chambers therein communicating with said fluid conduits said chambers adapted to collect liquid from said fluid conduits during one phase of the rotation of said filter drum and adapted to permit the removal of the liquid during another phase of the rotation of said filter drum.
4 more elements
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 lead and lag openings disposed therein in substantial alignment with lead and fluid conduits disposed in said drum;
- (c) means to rotate said drum in said filter vat;
- (d) lead and lag fluid conduits disposed in said drum in substantial alignment with the respective lead and lag circumferential openings in the drum, said conduits communicating with a valve means;
- (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;
- (g) means for removing 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 liquid 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 gas passes from the conduits through the circumferential openings to lift the filter cake from the filter cloth, the improvement comprising a pair of substantially toroidal liquid collection means disposed at opposite ends of said drum, each of said collection means including a series of circumferentially disposed chambers, each of said chambers communicating with the terminus of a lag fluid conduit and having a venting means, whereby during one phase of each rotation, high velocity gas passes through certain of the conduits to force residual liquid in the conduits into the chambers and to lift the filter cake from the filter cloth, while during another phase of each rotation of said filter drum, slurry is drawn onto the filter cloth, the solids forming a filter cake with at least a portion of the liquid passing therethrough to filtrate storage together with liquid from at least one of said chambers.
4 more elements
Dependencies are inferred from the claim text.