F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
39/34, 39/52
F27B 9/02 (2006.01) F23J 15/00 (2006.01) F27B 7/00 (2006.01) F27B 7/20 (2006.01) F27B 15/00 (2006.01) F27B 7/38 (2006.01)
Patent
CA 1051658
ABSTRACT OF THE DISCLOSURE Exhaust gas from the cooler is pulled through a mechanical dust collector by a cooler recoup fan and delivered as tempering air to a mixing box in which moisture is added to moisturize and also temper the hot bypass gases. The portion of hot gases coming from the kiln and passing into the preheat or preburn chamber that is drawn into the mi?ing box where such gases were mixed with atmospheric air in Canadian Patent 949,594 (U.S. Patent 3,653,645) are mixed with either cooler exhaust air and tempering water or a combination of cooler exhaust air and tempering water and atmospheric air. Excess cooler exhaust gases not utilized in the mixing box are directed to the windbox of the furnace preconditioning chamber on the suction side of the grate to raise the exhaust gas temperature from the grate above acid dew point which reduces corrosion problems. The exhaust gases having a controlled moisture content are cleaned in an electrostatic precipitator and exhausted through a stack. Utilizing the recouped cooler gases as a tempering medium for the gases from the preheat chamber of the furnace eliminates the need for a cooler electrostatic precipitator or gas permeable bags, lowers fuel consumption at the required higher grate waste gas temperature, lowers total system waste gas volume with properly moisturized waste gas providing better electrostatic precipitator performance and maintains the waste gas temperature above acid dew point.
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