微波紫外无极碘灯降解硫化氢气体

Investigation of Hydrogen Sulfide Degradation Using Electrodeless Iodine-UV Lamp

采用微波激发方式使无极碘灯发生放电,产生207 nm紫外辐射,并用于降解H2S气体.考察了初始ρ(H2S)、停留时间和微波电源功率等因素对H2S降解的影响.结果表明:H2S在微波无极碘灯停留时间为1.75 s时,其降解率随初始ρ(H2S)的升高而降低.初始ρ(H2S)为57.5 mg/m3时,H2S降解率为20.5%;初始ρ(H2S)为7.3 mg/m3时,H2S降解率可达到64.2%.在保持初始ρ(H2S)及停留时间不变的情况下,H2S降解率随电源功率的增加而提高.H2S经微波碘灯光解后的最终产物含有SO42-.

Microwave excitation method was employed in this experiment.207 nm UV light was used to treat the hydrogen sulfide（H2S） radiating from a microwave discharge electrodeless Iodine-UV lamp（MDEL-I）.Degradation efficiency of H2S was performed under different conditions of voltage,gas concentration and air flow rate.The results show that the degradation efficiency of H2S falls with its increasing inlet concentration at the gas residence time of 1.75 s.The degradation efficiency of H2S are 20.5% and 64.2% at the H2S concentration of 57.5 and 7.3mg/m^3 respectively.In addition,at constant initial concentration and gas flow rate,the H2S degradation efficiency enhances with increasing power consumption.The final degradation products of H2S include SO4^2-.