Two stage counter current drum washer

Details Two stage counter current drum washer Two stage counter current drum washer

D - Textiles, Paper

21

C

D21C 9/06 (2006.01)

Patent

CA 2298665

Paper fiber suspended in black liquor is washed in a rotating drum divided into a plurality of adjacent sectors. The fiber is formed into a mat on the drum, and the drum is rotated so the sectors (26) progress through a first wash and a second wash of progressively cleaner wash fluid. Each sector has two distinct drainage systems. One drainage system drains the first wash water (52) after it has passed through the mat, and is then blocked while that sector passes through the second wash (58). The cleaner second wash fluid is thus kept separate from the more contaminated first wash fluid, and is recirculated to be used in subsequent cycles as first wash fluid.

De la fibre de papier en suspension dans de la lessive noire est lavée dans un tambour rotatif divisé en une pluralité de secteurs adjacents. La fibre est transformée en un tapis sur le tambour et le tambour est mis en rotation de manière que les secteurs (26) passent par un premier lavage puis un second lavage avec un fluide de lavage progressivement plus propre. Chaque secteur comprend deux systèmes de drainage distincts. Un système de drainage évacue la première eau de lavage (52) après qu'elle soit passée à travers le tapis, puis il est bloqué tandis que le secteur passe par le second lavage (58). Le second fluide de lavage plus propre est ainsi gardé séparé du premier fluide de lavage plus contaminé, puis il est recyclé afin d'être utilisé dans des cycles ultérieurs comme premier fluide de lavage.

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