Method and apparatus for separation of steam and gas from...

F - Mech Eng,Light,Heat,Weapons – 26 – B

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F26B 17/10 (2006.01) D21D 5/24 (2006.01)

Patent

CA 2417673

When separating steam and gas from a stream containing, possibly glue-coated, fibre pulp produced by a refiner, the hot fibre pulp is directly fed from the refiner to a separation cyclone (4) placed in a drying channel (2) for drying the fibre pulp. A hot drying air flow having substantially higher temperature, about 160 ~C, than the fibre pulp is blown through the drying channel so that the separation cyclone is surrounded by the hot drying air flow. The light steam containing fraction separated by the separation cyclone is conducted out of the separation cyclone via an outlet conduit (9) away from the hot drying air flow, whereas the separated heavy fibre containing fraction is conducted out of the separation cyclone directly into the hot drying air flow that entrains the heavy fraction to a drying plant. Energy is recovered from the light steam containing fraction and ecologically harmful substances are separated from the latter.

L'invention concerne le moment où l'on sépare la vapeur du gaz dans un flux contenant une fibre de pulpe éventuellement recouverte de colle, cette fibre étant produite par un raffineur. La pulpe de fibre chaude est directement passée du raffineur à un cyclone de séparation (4) placé dans un canal de séchage (2) permettant de sécher la pulpe de fibre. Un flux d'air séchant chaud à une température sensiblement plus élevée, environ 160 ·C, que la pulpe de fibre est envoyé par le canal de séchage, de manière à ce que le cyclone de séparation soit entouré par le flux d'air séchant chaud. Le flux léger contenant la fraction séparée par le cyclone de séparation est alors conduit hors du cyclone de séparation par un conduit d'évacuation (9) à distance du flux d'air séchant chaud, alors que la fibre lourde séparée contenant la fraction est conduite hors du cyclone de séparation directement dans le flux d'air séchant chaud qui entraîne la fraction lourde vers une usine de séchage. On récupère l'énergie provenant du flux léger contenant la fraction et les substances non agressives pour l'environnement sont séparées dudit flux.

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