Emission control of N{sub 2}O by co-combustion of coal and biomass and narrow pulse corona discharge

N{sub 2}O and NO{sub x} from coal combustion are the main pollutants that contribute to the acid rain, greenhouse effect and depletion of stratospheric ozone layer. The emission controls of N{sub 2}O and NO{sub x} have been investigated by many researchers in recent years. In order to control the N{sub 2}O, NO{sub x} emissions, co-combustion of coal and biomass in a bench-scale fluidized bed and a series of experiments of pulse corona discharge have been carried out in the National Laboratory of Coal Combustion (NLCC). Co-combustion of coal and biomass was studied to reveal the influences of bed temperature, coal nature and biomass fraction on the emission of N{sub 2}O. The test results indicate that the co-combustion of coal and biomass can reduce the emissions of N{sub 2}O. The higher the nitrogen content is and the lower the volatile matter content of coal is, the more the reduction of emission of N{sub 2}O is. The biomass fraction and the bed temperature also influence the emission of N{sub 2}O. Pulse corona discharge has been developed as a de-NO{sub x}/SO{sub x}/dust method in pulverized coal fired boiler. N{sub 2}O fraction in fluidized bed combustion boiler is much higher in comparison with pulverizedmore » coal fired boiler. Narrow pulse corona discharge can decompose N{sub 2}O. The test results reveal that the emission of N{sub 2}O decreases with the increase of voltage and pulse duration.« less