Many special cases of cofiring biomass with coal has been examined in the past, with the growing concern for global climate change, it is now time to demonstrate its feasibility in practical use. Since 1997, the Engineering Program of Biomass Energy at the University of Pittsburgh has conducted a series of demonstrations, which focused on the utilization of clean urban waste in stoker boilers. In this paper, two demonstrations of cofiring biomass (clean urban waste wood) with coal in stoker boilers, conducted recently in the Bellefield Boiler Plant and the NIOSH boiler plant are described and the results summarized, including engineering and economic studies, parametric testing, and examining the feasibility of commercialization.
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