NO_x Emission in Fluidized Bed MSW Incinerator

Experiments were conducted to investigate the influence factors, such as waste characteristics, combustion temperature, oxygen concentration in the exhaust gas and urea injecting quantity, on the release of NO_x. The result has showed that the NO_x emission increases as the organic substance in MSW and combustion temperature in furnace increased. When the oxygen concentration in exhaust gas is less than 7%~8%, the NO_x emission increases with the increasing in oxygen concentration, however, increasing the oxygen concentration further, the NO_x emission decreases with the oxygen concentration slowly, because of the dilution of air. De-NO_x experiment was carried out by injecting urea solution at 850~890℃, it is found that the NO_x emission is higher than the value, which the urea is not injected into the furnace. This indicates that some of the urea is oxidized into NO_x, therefore, the total NO_x emission is increased. Under the normal operation condition, the NO_x emission is below 150mg/m~3.