Abstract
Publisher Summary This chapter examines the feasibility of burning coal in the mixtures of oxygen and recycled flue gas and determines the formation of CO, SO2, NO, and N2O under these conditions. The results of the experiments show that the conversions of fuel-N to NO and N2O, C to CO, and of S to SO2 are considerably lower in flue gas recirculation than in normal combustion in air, whereas the concentrations of these constituents are higher because of the lack of dilution with air nitrogen. The decrease in conversion is attributed to the destruction reactions and SO2 capture during recirculating the flue gas, which means a seven times increase in the residence time in the fluidized bed and freeboard zones. The qualitative dependencies of the concentrations of CO, SO2, NO, and N2O on temperature, pressure, and oxygen concentration are similar in oxygen/recycled flue gas mixtures and air.
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