F - Mech Eng,Light,Heat,Weapons – 23 – C
Patent
F - Mech Eng,Light,Heat,Weapons
23
C
F23C 7/02 (2006.01) F23G 7/04 (2006.01) F23L 9/02 (2006.01)
Patent
CA 2245294
This invention improves fluid flow, gas mixing and combustion in the furnaces of recovery boilers which burn liquor from various pulping processes, namely, the kraft process, the soda process, the sodium-based sulphite process, the closed-cycle CTMP (chemical, thermal, mechanical pulp) process, the magnesium-based sulphite process and the ammonium-based sulphite process, which are employed in the manufacture of pulp and paper, and in the furnaces of boilers burning biomass, wood waste or other solid fuel. The invention improves the operation of new or retrofitted boilers in several ways and can reduce both the capital and operating costs. One embodiment comprises introducing a portion of the combustion air, and/or recycled flue gas, at any elevation in the furnace, from two opposing walls only, as jets arranged in a partially-interlaced manner, with the jets oriented in a more or less common plane which is not horizontal. A second embodiment of the method in recovery boilers having a char bed, comprises introducing at least 80 percent of the primary air, in opposed, or partly opposed, jets from two opposing furnace walls and, where applicable, the remainder of the primary air in smaller jets from the two remaining walls of the furnace, with the ports from which all the jets originate being located on the sides of a common plane which is not horizontal. The first and second embodiment can be together applied as primary air to improve performance and reduce capital costs.
Blackwell Brian Robin
Maccallum Colin
Blackwell Brian Robin
Boiler Island Air Systems Inc.
Maccallum Colin
LandOfFree
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