气体放电光催化法去除模拟烟气中的SO_2

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

为探讨等离子体协同TiO2光催化剂的脱硫机理,利用填充床反应器将低温等离子体技术有机结合纳米TiO2光催化技术进行模拟烟气中脱硫实验,分别研究了外加电压、气体流量和SO2初始质量浓度等因素对脱硫效率的影响。采用二次回归正交法设计实验步骤,使外加电压、气体流量和SO2初始质量浓度等因素在限定范围内达到最优组合。经拟合,当SO2初始质量浓度为535 mg/m3,输入电压为5.8 kV,气体流量为0.2 m3/h时,SO2脱除率可达87.1%。实验证明了气体放电等离子体技术与光催化技术相结合的可行性。

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/m^3, voltage is 5. 8 kV, the gas flow is 0. 2 m^3/h after quadratic fit. The experiment also proves that plasma and nanometer titanium dioxide photocatalysis technology using in together are advisable.