Ahlstrom Machinery Oy

Pekka Tormikoski

Holger Engdahl

Martti Pokkinen

Clarifying and/or filtering of green liquor and an apparatus therefore

Falling film cross filtration apparatus

A filtering method and apparatus pass the suspension (e.g. green liquor) to be filtered in a falling film down a first side of a filtering surface of a filter element at a different (higher) pressure than a second side, so that due to the pressure difference prevailing across the filtering surface the filtrate flows through the filtering surface and separated solids substantially remain in the suspension, without forming an undesirable solids layer on the filtering surface. A uniform liquid film falling on the filtering surface is generated by recirculating suspension from the bottom of the filter housing to an upper portion of the filter element. Nozzles may direct flow toward the filtering surface in localized areas. The method may be practiced continuously or in batches.

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Savonlinna, Finland

Pekka Tormikoski