Circulating fluidized bed repowering to reduce Sox and Nox emissions from industrial and utility boilers

摘要

Repowering industrial and utility boilers with a circulating fluidized bed combustor to reduce SOx and NOx emissions emanating from the boilers by the following steps.PPFirst combusting high sulfur- containing carbonaceous solid fuel in a circulating fluidized bed combustor in admixture with limestone and air.P PSecondly combusting a carbonaceous fuel in an industrial or utility boiler. PPThirdly mixing the flue gases generated in the circulating fluidized bed combustor with the exhaust gases produced in the industrial or utility boiler.PPFinally controlling the total heat generation by maintaining the circulating fluidized bed heat input to the boiler furnace from about 70 to 90% and the heat input of the boiler furnace from about 30 to 10%.