Influences of different operation conditions on the emission characteristics of O2/recycled flue gas (RFG) waste incineration

This study applies the modified O-2/recycled flue gas (RFG) combustion technology to waste incineration and investigates the emission characteristics Of CO2, CO, NOx, SO2, and HCl at different operation conditions. The operation parameters under investigation include the O-2 concentration in the feed gas, the rate of RFG, the total flow rate of feed gas, the type of incinerator, and the chemical compositions of feedstock. Experimental results show that the concentrations Of CO2, SO2, and HCI in the exhausts can be enhanced by properly adjusting the O-2 concentration in the feed gas and the RFG rate. This facilitates the removal of these pollutants by conventional control equipment. With 21% O-2 feed gas and 75% RFG rate, the highest CO2 concentration can achieve 54%. A fluidized bed incinerator had better combustion efficiency than a fixed bed incinerator. The combustion efficiency levels were 96.68-99.99% and can be improved by increasing the RFG rate and O-2 concentration. Moreover, the total flow rate of feed gas influences the mixing levels of gas and solid as well as the residence time of combusted gas in the incinerator. With a moderate total flow rate of feed gas (60 L/min), the concentrations Of CO2, SO2, and HCI in the exhausts can be enhanced and those of CO and NOx were depressed.