F - Mech Eng,Light,Heat,Weapons – 23 – C
Patent
F - Mech Eng,Light,Heat,Weapons
23
C
F23C 7/02 (2006.01) F23L 9/00 (2006.01) F23L 13/02 (2006.01) F23L 15/00 (2006.01) F23M 5/08 (2006.01)
Patent
CA 2173539
Combustion gas is fed to a furnace, preferably a recovery boiler for combusting black liquor from cellulose pulp processing, through a gas nozzle disposed in association with a wall of the furnace. The nozzle has a longitudinal axis of elongation, an exterior, and a hollow interior. Cooling gas is directed into contact with the nozzle exterior, and typically also the furnace wall where the nozzle engages the furnace wall. The cooling gas typically moves in a direction substantially perpendicular to the longitudinal axis of the nozzle, and cools the nozzle. Combustion gas passes through the nozzle hollow interior and enters the furnace facilitating combustion of black liquor within the furnace. Desirably the cooling gas is redirected and enters the nozzle interior as the combustion gas. The nozzle may be further cooled by cooling fins or studs on a portion of the nozzle exterior impacted by cooling gas. The rate of gas flow may be regulated to control the amount of gas redirected into the nozzle for use as combustion gas. The invention results in effective cooling of the nozzle to extend its life, recovery of heat from the nozzle by utilizing it to preheat the combustion air, and the prevention of clogging of the cooling air flow paths because they are maintained distinct from areas where furnace impurities exist.
Nikkanen Samuli
Tanttu Markku
Ahlstrom Machinery Oy
Gowling Lafleur Henderson Llp
Nikkanen Samuli
Tanttu Markku
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