Recovery boiler

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 11/00 (2006.01) D21C 11/12 (2006.01) F23G 5/14 (2006.01) F23G 7/04 (2006.01) F23L 9/00 (2006.01)

Patent

CA 2220325

Object: To provide a recovery boiler for recovering soda component from pulp spent liquor, which is able to prevent carry-over of unburnt char and deformation of char bed configuration and to attain a stable combustion with low NOx generation. Solving means: By regulating combustion air supply, and feeding inert gas along furnace side wall around char bed as the case may be, there are formed a combustion zone of reduction atmospheric field where air ratio in surroundings of char bed is 0.8 or less, a combustion zone of reduction atmospheric field where air ratio is 1.0 or less and unburnt components exist (including a case to form reduction atmospheric field where air ratio is 1.0 or less and unburnt components exist with said two combustion zones being combined together) and a combustion zone where combustion completes.

Objet : conception d'une chaudière de récupération, permettant de récupérer la soude à partir d'une liqueur usée de pâte, d'empêcher le transfert de charbons non brûlés et la déformation de la configuration du lit de charbons, et d'obtenir une combustion stable avec une faible production de NOx. Solution : en ajustant l'alimentation en air de combustion et en injectant un gaz inerte le long de la paroi latérale du four autour du lit de charbons, selon le cas, il se forme une zone de combustion de champ atmosphérique de réduction, où le rapport d'air entourant le lit est de 0,8 ou moins, une zone de combustion de champ atmosphérique de réduction, où le rapport d'air est de 1,0 ou moins, avec des constituants non brûlés (y compris un cas de formation de champ atmosphérique de réduction, où le rapport d'air est de 1,0 ou moins, avec des constituants non brûlés, les deux zones de combustion étant combinées), et une zone de combustion, où celle-ci est parachevée.

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