F - Mech Eng,Light,Heat,Weapons – 23 – C
Patent
F - Mech Eng,Light,Heat,Weapons
23
C
110/44
F23C 9/00 (2006.01) F23J 7/00 (2006.01) F23L 1/02 (2006.01) F23L 9/02 (2006.01)
Patent
CA 1160106
APPARATUS AND METHOD FOR FLUE GAS RECIRCULATION IN A SOLID FUEL BOILER - - - - - ABSTRACT This invention relates to the field of utilizing flue gas recir- culation on solid fuel first boilers and furnaces. Flue gas recircula- tion (FGR) in boilers and furnaces is a technique generally known in the prior art. Flue gas is commonly introduced into a combustion chamber within a boiler above the burning fuel bed. This continual recycling of the flue gas results in a further burning of smoke and other particulate matter contained therein. Additionally, the formation of various nitric and nitrous oxides and carbon monoxide gases in the flue gas is reduced thereby minimizing the releasing of these undesirable gases into the atmosphere. The present invention teaches an improvement in the use of recycled flue gase. According to the invention the recycled flue gas is mixed with air and introduced into the primary undergrate combustion air of a solid fuel fired boiler. An air-flue gas mixture which is at least approximately 25% flue gas supplied in this manner creates a fuel bed that is more reactive than one without this mixture. By providing this mixture under the burning fuel bed, the temperature of the fuel bed is lowered and excess oxygen is reduced. A more reactive fuel bed results providing various advantages including improved boiler operation and a clinker-free fuel bed.
378859
de Volo Nick B.
Maloney Kenneth L.
Research-Cottrell Technologies Inc.
Smart & Biggar
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