PCDD PCDF FORMATION AND DESTRUCTION DURING CO-FIRING OF COAL AND RDF IN A SLAG FORMING COMBUSTOR

Environmental aspects related to the co-firing of pulverized coal and RDF (refuse derived fuel) in a slag forming combustor have been invest igated with regard to specific combustion parameters and fuel type. Th ree classes of organic micropollutants have been considered: PCDD (pol ychlorodibenzodioxins), PCDF (polychlorodibenzofurans) and PAH (polycy clic aromatic hydrocarbons). The emissions from coal/RDF combustion (4 0% RDF) have been compared with those from the plant fired with pulver ized coal alone. In order to follow the thermal and oxidative history of the investigated organic compounds, samples of flue gases were coll ected at the exit of the slagging combustor but before the boiler entr ance, and at the boiler outlet stack.