Research On Integrated Technology Of Desulfurization And Denitrification With Manganese Oxide

Flue gas desulfurization and denitrification technologies which are under study at home and abroad,are high operating costs or catalyst poisoning failure,the step-by-step operation,with little integrated consideration and recycling.In view of the above problems,this study make full use of the natural characteristics of flue gas and manganese oxide,putting forward flue gas desulfurization and denitrification dry integration technology,which use manganese oxide circulating working medium,cycling oxidation absorption of flue gas SO2 and NOx,Meet the ultra-low emission standards,while recycling the corresponding by-products.This paper studies the low temperature of 150? under the conditions of low-cost manufacturing and the use of manganese oxide dry desulfurization and denitrification.First of all,through single factor,orthogonal experiment to get the absorbent MnOx which are made by working medium manganese nitrate optimum process conditions:liquid phase reaction temperature is 72?reaction time 30min?liquid phase stirring speed 300r/min?drying temperature 180??drying time 4h?air flow 3L/min?alkali 25%,the oxidation degree of MnOx is 57.31%.The XRD,BET,particle size distribution analysis showed that the specific surface area of the absorbent reached 77 m2/g,the average particle size distribution of the average diameter of 1 ?m.By thermal decomposition of MnOx denitrification products,denitrification operating temperature range and the optimal denitration temperature curve are obtained,to achieve variable temperature denitrification,denitration efficiency higher.Through the denitration of MnOx,the maximal nitration amount of homemade MnOx is 10%NO3-.Small trials and extended experiments have proved that in the presence of sufficient fresh absorbent MnOx,the exhaust can not detect the presence of SO2 and NOx.In this study,by exploring the separate denitrification,the desulfurization first and then denitrification,combined desulfurization and denitrification,to clarify the influencing factors of removal efficiency,all showed that:the average reaction rate of desulfurization and denitrification increased with the increase of temperature and PNO.Desulphurization and denitrification affected each other and the combined desulfurization and denitrification benefitted better.The kinetic equation of the combined desulfurization and denitrification was obtained with the reaction order 0.8 and activation energy 24.16 kJ/mol.The pre-exponential factor of the reaction was found to be about 464.64 min-1 and the correction parameter 0.95.