Experimental Research Of Flue Gas Desulfurization And Denitrification With Semi-Dry Technique

Simultaneous desulfurization and denitrification technology is applicable in our nationalconditions and has good application prospect.Semi-dry technique flue gas desulfurization was studied in spouted bed testing apparatus byusing urea as absorbent. The effects of many key operating parameters on the removal efficiencyof SO2 were investigated,such as molar ratio of urea and SO2,inlet temperature of flue gas,static bed height,approach to adiabatic saturation temperature,inlet concentration of SO2 etc.Synchronously semi-dry flue gas simultaneous desulfurization and denitrification was studied forits feasibility in the same testing apparatus by using the same absorbent. The effects of keyoperating parameters such as molar ratio of urea and air pollutant,approach to adiabaticsaturation temperature,inlet temperature of flue gas and inlet concentration of air pollution onthe removal efficiency of SO2 and NOX were investigated. The results show that thedesulfurization efficiency by using Ca(OH)2 serosity is higher than that by using urea solution,but by using urea solution as absorbent can also remove NOX from the flue gas. In the propercondition the removal efficiency of SO2 and NOX are above 85% and 75% respectly,which cansatisfy most requirements of industrial scale applications. Different from other semi-dryprocesses,the removal efficiency of gaseous contaminants drop rapidly while molar ratio of ureaand air pollutant is greater than 1.2. The influences of other factors of desulfurization anddenitrification efficiency coincid with that of other semi-dry technologies.On the basis of thesefactors,two empirical equations for the desulfurization and denitrification were established. Thevalues calculated from the empirical equation agreed well with the experimental values. Itprovides some theoretical information for the optimal design of the engineering.