F - Mech Eng,Light,Heat,Weapons – 23 – G
Patent
F - Mech Eng,Light,Heat,Weapons
23
G
257/29, 110/2.1
F23G 5/00 (2006.01)
Patent
CA 1150569
P 49 4677 IMPROVED HEAT RECOVERY FROM WET WOOD WASTE ABSTRACT OF THE DISCLOSURE Overall heat recovery from wet wood waste, particularly sawmill- generated hog fuel, is improved by a process for predrying the fuel. A wet oversize fraction of the fuel is combusted in a fluid bed reactor providing heat for drying the remaining smaller sized fraction of the waste pile to about 10-30% moisture by weight. The gaseous products of the fluid bed burning are contacted with the fuel fraction in, preferably, a rotary dryer. The dried fuel is then screened into coarse and fine fractions. The coarse fraction is fed onto a grate of a wood waste boiler. The fines fraction is injected into the boiler combustion in an air suspension. The amount of fuel fed to the fluid bed reactor is 10-25% of the total fuel flow, depending upon the moisture content of the fuel. The gases fed to the rotary dryer are less than about 1,200°F, to minimize "blue haze," by combining with minimum outside air.
364743
Osler Hoskin & Harcourt Llp
Weyerhaeuser Company
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