N2O emission from circulating fluidized bed combustion of coal.

Parametric study was made on emission of nitric oxide (NO) and nitrous oxide (N2O) from a bench scale circulating fluidized bed combustor (CFBC) of coal. It was found that significant amount of N2O was emitted from the CFBC. N2O emission levels were dependent on the bed temperature and coal types, and were parti cularly sensitive to former. Under the condition of lower bed temperature and/or low volatile coals, the N2O emission increased. The dependency of N2O emission on the bed temperature and the coal types was opposite to that of NO.The total amount of NO and N2O was rather independent of the operating conditions except for the coal types and became large for low volatile coals.