NH_3-induced removal of NO_X from a flue gas stream by silent discharge ozone generation in a double reactor system

摘要

NOx, a generic term for the nitrogen oxides generated from combustion in the presence of nitrogen, is a serious threat to human health. This study examined the removal of NOx using ammonia (NH3) and ozone produced using a silent discharge method. The effects of temperature and residence time on NOx removal with NH3 injection in a double reactor system were investigated. An increase in temperature resulted in higher levels of O-3 decomposition, whereas the maximum particle formation in the form of ammonium nitrate (NH4NO3) was achieved when both reactors were kept at 180 C-o. NH3 and O-3 injection in large quantities and NO in smaller amounts with a residence time of 10.2 s resulted in the maximum particulate formation. In contrast, when an excess of NH3 was supplied, it resulted in N2O formation due to the formation of NH2 radicals generated from a reaction of NO2 with NH3. In addition, 100% NO removal was achieved regardless of the residence time. Kinetic simulations indicated the possibility of moisture being the limiting reactant.