Means for gas-sealingly conveying shredded pulp

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/10 (2006.01) B01J 3/02 (2006.01) D21C 7/06 (2006.01)

Patent

CA 2197190

A wall passageway, having openings therein only at opposite, inlet (14) and outlet (18) ends thereof, has a shaft (22) journalled therein. The shaft carries a screw thereon for moving shredded pulp through the passageway. The screw (24) is foreshortened, having a length less than that of the passage way, and causes inlet-admitted pulp to form into a continuously moving pulp plug. The plug, albeit having some porosity, comprises a gas seal within the passageway, and inhibits any migration of downstream gas from escaping to the atmosphere via the passageway and the inlet (14) thereof. In addition, a source (32) of oxygen or such gas as is inert to any downstream process is controllingly admitted into the inlet (14) to maintain an upstream pressure equal to, or greater than any downstream process pressure to insure against release of downstream gas into the atmosphere.

Conduite close, ne comportant d'ouvertures qu'à ses extrémités d'admission (14) et de sortie (18) opposées, et comportant un arbre (22) tourillonné à l'intérieur. L'arbre porte une vis sans fin assurant le déplacement de la pâte de cellulose déchiquetée le long de la conduite. La vis sans fin (24) est écourtée, sa longueur étant inférieure à celle de la conduite, ce qui a pour effet que la pâte admise à l'entrée forme un bouchon de pâte à déplacement continu. Le bouchon, bien qu'ayant une certaine porosité, forme un joint étanche au gaz à l'intérieur de la conduite, interdisant toute migration des gaz situés en aval qui risqueraient de s'échapper dans l'atmosphère par la conduite et son ouverture d'admission (14). En outre, une source (32) d'oxygène ou d'un gaz tel qu'un gaz inerte par rapport à tout processus s'effectuant en aval est admise de manière régulée par l'extrémité d'admission (14) afin de maintenir une pression en amont égale ou supérieure à la pression du processus en aval afin d'interdire toute libération dans l'atmosphère des gaz situés en aval.

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