Experimental Research on SO_2 Removal from Simulated Flue Gas Using Gas Discharge and Combined Photolysis

As the problem of environment pollution which is caused by sulphur dioxide becomes more serious,some environment protection agencies have made strict rules to control the sulfur dioxide emission from coal fired power plant.In this paper,two kinds of technologies-plasma and nanometer titanium dioxide photocatalysis technology-unify well in together using packed bed reactor,and the massive experimental study is done.In addition,this paper discusses the desulfurization mechanisms using plasma and Combined Photolysis,and the factors such as voltage,gas flow and initial concentration of sulphur dioxide effecting on the efficiency of desulfurization.The effectiveness of treating sulphur dioxide by corona discharge plasma and nanometer titanium dioxide photocatalyser is studied.A large quantity of free radicals with strong oxidability can be produced through corona discharge and nanometer titanium dioxide photocatalyser,which can react physicochemically with sulphur dioxide,so as to remove sulphur dioxide.Meanwhile a proper dielectric medium can also be added to strengthen corona discharge,which can make the intervention of nanometer titanium dioxide photocatalyser and reduce the cost of the treatment.To gain optimal group of voltage,gas flow and initial concentration of sulphur dioxide effecting in assigned limit,designing experimental procedure with quadric orthogonal regression equation.Finally,the multiple linear regression model was founded by the method of simple regression orthogonal design,the rule of experiment target and single variable is concluded.The removal rate can reach 80.1% when the sulphur dioxide initial concentration is 535mg/m3,voltage is 5.8 kV,the gas flow is 0.2m3/h after quadratic fit.The experiment also proves that plasma and nanometer titanium dioxide photocatalysis technology using in together are advisable.