Study On Removal Of Nitrogen Oxides In Flue Gas Sintering

NO is one of the major air pollutants, which is serious hazards to human health and the NO in flue gas treatment technologies currently is Selective Catalytic Reduction (SCR).In order to solve the problem that the reaction temperature and the cost too high, this study developed a Co/ Al2O3 catalyst.The main catalyst in the study is Co/ Al2O3, experimental method for the removal of NO is SCR-CH4. Several main factors of this experiment are demonstrated here,including temperature and the active ingredient in the catalyst. Finally, we added the non-thermal plasma generating by high voltage D.C. corona, and based on which the reaction mechanism of the catalytic reduction of NO with additive activated by the high voltage pulse discharge plasma has been explored preliminarily. In addition we have made Ag-ZSM-5,Co-ZSM-5 as catalysts, so we can have the compare with Co/Al2O3.The conclusions can be geted from the experiments:When the active ingredient in Co/Al2O3 between 5%-10%, the efficiency of remove is the best.The counts of Co2+ affects removal result of NOx. And based on this we can improve catalyst or add in additive to obtain higher removal result.When the catalyst is Ag-ZSM-5 and the temperature is 450℃, the best removal result is 37.3%. Compared with Co/Al2O3 catalyst, Small temperature window also shows that the temperature will have significant impact on the rate of removal. The active ingredient of Ag-ZSM-5 also has impact on the removal.When the catalyst is Co-ZSM-5 and the temperature is between 410℃～460℃, the best removal is 43.6%. The temperature will have significant impact on the rate of removal.It is found that the catalytic reduction of NOx with additive activated by the high voltage D.C. corona is achieved mainly through a series of fast elementary reactions and that the active atom CH4 is the base for NO removal. Higher is discharge voltage, better is removal result of NOx. Because in a certain voltage range, high and low voltage little effect on removal, we can use lower voltage to reduce the economic cost.