介质阻挡放电降解异味物质CS_2研究

Removal Mechanism of CS_2 Odorous Gas with Dielectric Barrier Discharge

采用介质阻挡放电降解二硫化碳(CS2)模拟废气,考察了外加气体空气、氮气(N2)、电源输入功率、初始浓度和停留时间对CS2转化率的影响。结果表明:CS2的去除率呈现空气>N2。在输入功率63 W,停留时间为5.34 s,CS2的初始浓度300 mg/m3,N2氛围下的去除效率为36.9%,而空气氛围下的去除效率可达62.5%。在N2与空气氛围下其产物明显不同,在空气氛围下,主要产物为SO2、COS、CO和CO2;而在N2氛围下其主要产物为大量单质硫、少量CO与CO2。对DBD降解CS2的机理分析表明,在N2条件下主要是高能电子与紫外光的作用;而在有空气条件下,O2的存在促进了CS2的深度氧化。

Removal of simulated CS2 gas was investigated with dielectric barrier discharge （DBD） technology. Influence of additive gases including air and N2, plasma power, and initial concentration of CS2 and discharge time on decomposition efficiency of CS2 was preliminary discussed. Results showed that the order of extra gases influencing degradation efficiency of CS2 as air〉N2. When input power was 63 W, initial mass concentration was 300 mg/m3 and residence time was 5.34 s, removal efficiency of CS2 reached 36.9% in N2 and 62.5% in air respectively. The degradation products was SO2, COS, CO and CO2 in presence of air, while the products were mainly elemental sulfur, small amounts of CO and CO2 in presence of N2. Degradation mechanisms of CS2 by DBD with additive gases of air and N2 were different, mainly collective action of high energy electrons and UV light in presence of N2, and 02 could promote CS2 deeply oxidized in presence of air.