Combustion air system for recovery boilers, burning spent...

F - Mech Eng,Light,Heat,Weapons – 23 – L

Patent

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Details

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

Patent

CA 2584050

An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls on one or several levels of the furnace. A plurality of air ports are located at several horizontal elevations for introducing air into the furnace from an air supply. In the arrangement for the secondary air flows, at least two horizontal air levels at different elevations are arranged above the lower primary levels and below the black liquor sprayer. Secondary air is supplied from two opposite walls. The secondary air ports on each of said first and second horizontal elevations comprise air ports for each horizontal elevation that project a pattern of large air jets into the furnace from said opposite walls and said secondary air ports further comprise a plurality of secondary air ports on at least one of the elevations that project smaller air jets into the furnace.

L'invention concerne un agencement permettant de fournir de l'air sous forme de jet d'air au four d'une chaudière de récupération, ledit four comprenant une paroi avant, une paroi arrière et des parois latérales. Des dispositifs de pulvérisation de liqueur noire sont disposés sur les parois du four sur un ou plusieurs niveaux. Plusieurs arrivées d'air de combustion se trouvent sur plusieurs niveaux horizontaux afin d'introduire de l'air dans le four à partir d'une alimentation d'air. Dans un agencement destiné à l'écoulement d'air secondaire, au moins deux niveaux d'air horizontaux disposés à des hauteurs différentes sont agencés au-dessus des premiers niveaux inférieurs et en-dessous du niveau de pulvérisation de liqueur noire. De l'air secondaire provient de deux parois opposées. Les orifices d'air secondaire sur chacun des premier et deuxième niveaux horizontaux comportent des orifices pour chaque niveau qui projettent une configuration de jets d'air de grande taille dans le four depuis les parois opposées et des orifices sur au moins un des niveaux qui projettent des jets d'air de plus petite taille dans le four.

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