Patent ID: 9643885
Date: 2017-05-09
CPC Classifications: C04B,C10J,F27B,F27D,Y02P

Claim:
1. A method for burning lime mud in a rotary drum kiln comprising: moving lime mud through the rotary drum kiln while flue gas flows through the kiln counter-currently to the lime mud; producing lime from the lime mud in the rotary drum kiln and discharging the lime from the rotary drum kiln; forming the flue gas with a burner positioned proximate to an end of the rotary drum kiln; fueling the burner with a fuel gas; producing the fuel gas by gasifying fuel in the presence of combustion air in a gasifier including a solid bed or fluidized bed, wherein the gasifier is physically separate from the rotary drum kiln and burner; heating air for use as the combustion air with heat from the lime discharged from the rotary drum kiln.