Microscreening method and apparatus

Details Microscreening method and apparatus Microscreening method and apparatus

B - Operations, Transporting

01

D

182/57

B01D 33/067 (2006.01)

Patent

CA 1060351

ABSTRACT OF THE DISCLOSURE Drop-back of solids into the drum pool of a rotary microscreen is reduced by applying a limited gas pressure differential across an unsubmerged portion of the screen cloth. The pressure is not for the purpose of increas- ing the driving force, .DELTA. H, of the liquid passing through the cloth. For purposes of this disclosure, .DELTA. H is the pressure differential existing across the screen below the surface of both the drum pool and tank pool. In fact, assuming other factors remain equal, application of a gas pressure differential to an unsubmerged portion of the screen cloth, with consequent reduction in drum pool suspended solids concentration, will normally reduce .DELTA. H even though the gas pressure also acts on the surface of the drum pool. More significantly, the invention enables operation of a microscreen unit at increased flow capacity at a given .DELTA. H. Whatever pressure is applied, there will be some reduction of torque, bearing load and wear at any given .DELTA. H.

216811

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