Method and apparatus for heating pulps

Details Method and apparatus for heating pulps Method and apparatus for heating pulps

D - Textiles, Paper

21

C

D21C 9/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2306374

The present invention relates to a method and apparatus for heating pulps, in which method low-pressure steam is supplied into the pulp flowing as a plug flow in such a way that in the flowing direction of the pulp, before supplying the low-pressure steam, the pulp is pressurized in such a way that the pulp pressure at the point of the supply of steam is lower than the pressure of the available steam, and that after the supply of steam the pulp is mixed by means of a pressure- raising mixing means either to divide the steam evenly into the pulp and/or equalizing the temperature of the pulp.

L'invention concerne un procédé et un appareil pour chauffer des pâtes. Ledit procédé consiste à envoyer de la vapeur basse pression dans la pâte circulant sous forme de flux en bloc, de sorte qu'avant l'envoi de vapeur basse pression, dans le sens d'écoulement de la pâte, cette dernière soit mise sous pression, et que la pression de la pâte au niveau de l'alimentation en vapeur soit inférieure à celle de la vapeur disponible. Après l'apport en vapeur, la pâte est mélangée au moyen d'un organe mélangeur augmentant la pression, soit pour que la vapeur soit divisée de manière homogène dans la pâte et/ou que la température de la pâte soit homogène.

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