Influences of ammonium sulfate additive on Cl and N co-transformation during biomass/semi-coke oxy-fuel co-combustion

To investigate the influences of ammonium sulfate(AS) on the K/S/Cl transformation and N₂O/NO emission, the biomass and semi-coke were co-combusted in a 50 kW circulating fluidized bed under O₂/CO₂ atmosphere. The experimental results show that AS can reduce the Cl content in deposits obviously and decrease the NO concentration in flue gas significantly. Besides, AS can retain more K in bottom ash and circulating ash, thereby reducing the K content in deposits. In terms of reducing Cl in deposits, the top half of the riser is the optimal position to inject AS.