Transformation of mineral and emission of particulate matters during co-combustion of coal with sewage sludge

摘要: Co-combustion of coal with sewage sludge was carried out in laboratory-scaled drop tube furnace to understand the interaction between different fuels. The combustion conditions were selected as follows: raw material feeding rate 0.2–0.3 g/min, temperature 1200 °C, atmosphere 10% O2 and N2 being balance used guarantee an air ratio 1.5, residence time varied from 0.6 2.4 s. coal/sewage is kept at 50:50 (wt% wt%), four fuel pairs respect mineral association within individual fuel. results showed obvious during their co-combustion. For carbon conversion, devolatilization mixing occurred quickly; both char evolved volatile progressed almost completely. As a result, unburnt zero fly ash. In addition, evolution PM minerals rich included minerals, they combusted separately furnace, less accordingly. Conversely, for them excluded reacted each other form much agglomeration, therefore, particle size ash increased, while amount decreased, which changed coarse particles. Finally, case mineral, co-combustion led minerals. more fine particles formed, part into PM. vaporized trace elements, adsorbed by melt CaPO4/Al–Si accordingly, contents particulate matter reduced whereas distribution shifted large value.