Method and apparatus for improving the safety of a spent...

D - Textiles – Paper – 21 – C

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D21C 11/12 (2006.01) F23M 5/08 (2006.01)

Patent

CA 2130087

The invention relates to a method and apparatus for use in the pulp industry for improving the safety of a spent liquor recovery boiler, such as soda recovery boiler, whereby the boiler comprises, for recovering chemicals and energy, a furnace cooled by water tubes and connected to the water/steam circulation system of the boiler, the cooling of the bottom of said furnace being provided by a separate cooling circulation. The separately cooled lower section of said furnace is provided by separating the bottom or the bottom and part of the furnace walls from the boiler water circulation system. This separated section is supplied with a cooling medium of its own which may be a gas or a liquid which does not cause an explosion if it contacts the melt of the furnace.

L'invention a trait à une méthode et à un appareil devant servir dans l'industrie de la pâte de bois à améliorer la sécurité d'une chaudière de récupération de liqueur résiduaire, comme la chaudière de récupération de la soude, invention dans laquelle la chaudière comprend, pour la récupération des produits chimiques et de l'énergie, un four refroidi par des tubes d'eau et reliée au système de circulation d'eau/de vapeur de la chaudière, le refroidissement du fond dudit four étant assuré par un circuit de refroidissement séparé. La partie inférieure dudit four, qui est refroidi séparément, est obtenue en séparant le fond ou le fond et une partie des parois du four du système de circulation d'eau de la chaudière. Cette partie séparée est approvisionnée par son propre fluide de refroidissement, lequel peut être un gaz ou un liquide qui ne provoque pas d'explosion s'il entre en contact avec les produits en fusion du four.

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