SULFUR CAPTURE IN COMBINATION BARK BOILERS

A review of sulfur dioxide emission data for eight combination bark bo ilers in conjunction with the sulfur contents Of the fuels reveals sig nificant sulfur capture ranging from 10% to over 80% within the solid ash phase. Wood ash characteristics similar to activated carbon as wel l as the significant wood ash alkali oxide and carbonate fractions are believed responsible for the sulfur capture. Sulfur emissions from co mbination bark-fossil fuel firing are correlated to the sulfur input p er ton of bark or wood residue fired.