High-Phosphorus Fuel Combustion: Effect of Oxyfuel Conditions on PM10 Emission from Homo- and Heterogeneous Phases

Abstract

Volatiles and char were prepared from the pyrolysis of a biosolid (with a phosphorus content of ∼2.3 wt %) at 1000 °C and then combusted separately in air and oxyfuel (30% O2 in CO2) in a drop-tube furnace at 1300 °C. The aim is to understand the effect of oxyfuel conditions on the emission of particulate matter with aerodynamic diameters of ≤10 μm (PM10) from separated combustion in homo- and heterogeneous phases, respectively. For volatiles combustion in homogeneous phase that leads to only PM1 (dominantly PM0.1) emission, a change from air to oxyfuel results in an increase in PM1 emission as a result of a higher yield of Na, K, S, and P, likely resulting from enhanced sulfation of alkali species under oxyfuel conditions (with a higher O2 content), but leads to a negligible effect on the release of trace elements (As, Cd, Pb, V, and Zn). On the contrary, for char combustion in heterogeneous phase that contributes to both PM1 and PM1–10 emissions, a change from air to oxyfuel conditions leads to a reduct...