Filtering method and apparatus

Details Filtering method and apparatus Filtering method and apparatus

B - Operations, Transporting

01

D

B01D 29/15 (2006.01) B01D 29/11 (2006.01) B01D 37/00 (2006.01) B01D 29/72 (2006.01)

Patent

CA 2175602

The present invention relates to a filtering method, in which the suspension to be filtered is passed into contact with the filtering surface of the filter element, whereby due to the pressure difference prevailing across the filtering surface the filtrate flows through the filtering surface and separated solids substantially remain in the sus- pension. According to the invention the suspen- sion to be filtered is passed to flow downwards along the filtering surface, whereby the filtering through the filtration surface takes place from the falling film and the separated solids are dis- charged with the falling film without forming a harmful solids layer on the filtering surface. An even liquid film falling on the filtering surface is generated by recirculating suspension from the bottom of the filter to the upper part of the filter element. The invention also relates to an ap- paratus for realizing the method, which may be applied especially for clarifying green liquor.

La présente invention se rapporte à un procédé de filtrage, selon lequel la suspension à filtrer est mise en contact avec la surface filtrante du filtre, la différence de pression exercée sur toute la surface filtrante amenant le filtrat à s'écouler à travers cette dernière tandis que les matières solides séparées demeurent pour la plupart dans la suspension. Selon l'invention, la suspension à filtrer s'écoule vers le bas le long de la surface filtrante, le filtrage à travers la surface filtrante s'éffectuant à partir du film liquide s'écoulant vers le bas, et les matières solides séparées sont évacuées avec le film sans former une couche nocive sur la surface filtrante. Un film liquide régulier tombant sur la surface filtrante est généré par le recyclage de la suspension à partir de la base du filtre jusque vers sa partie supérieure. L'invention se rapporte également à un appareil permettant d'appliquer ce procédé, lequel s'applique particulièrement à la clarification de la liqueur verte.

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