Xu Fei, Luo Zhongyang, Cao Wei, Wang Peng, Wei Bo, Gao Xiang, Fang Mengxiang, Cen Kefa
State key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
J Environ Sci (China). 2009;21(3):328-32. doi: 10.1016/s1001-0742(08)62272-x.
A process capable of simultaneously oxidizing NO, SO2, and Hg0 was proposed, using a high-voltage and short-duration positive pulsed corona discharge. By focusing on NO, SO2, and Hg0 oxidation efficiencies, the influences of pulse peak voltage, pulse frequency, initial concentration, electrode number, residence time and water vapor addition were investigated. The results indicate that NO, SO2 and Hg0 oxidation efficiencies depend primarily on the radicals (OH, HO2, O) and the active species (O3, H2O2, etc.) produced by the pulsed corona discharge. The NO, SO2 and Hg0 oxidation efficiencies could be improved as pulse peak voltage, pulse frequency, electrode number and residence time increased, but they were reduced with increasing initial concentrations. By adding water vapor, the SO2 oxidation efficiency was improved remarkably, while the NO oxidation efficiency decreased slightly. In our experiments, the simultaneous NO, SO2, and Hg0 oxidation efficiencies reached to 40%, 98%, and 55% with the initial concentrations 479 mg/m3, 1040 mg/m3, and 15.0 microg/m3, respectively.
提出了一种利用高压短脉冲正电晕放电同时氧化NO、SO2和Hg0的方法。通过关注NO、SO2和Hg0的氧化效率，研究了脉冲峰值电压、脉冲频率、初始浓度、电极数量、停留时间和添加水蒸气的影响。结果表明，NO、SO2和Hg0的氧化效率主要取决于脉冲电晕放电产生的自由基（OH、HO2、O）和活性物种（O3、H2O2等）。随着脉冲峰值电压、脉冲频率、电极数量和停留时间的增加，NO、SO2和Hg0的氧化效率可以提高，但随着初始浓度的增加而降低。通过添加水蒸气，SO2的氧化效率显著提高，而NO的氧化效率略有下降。在我们的实验中，当初始浓度分别为479 mg/m3、1040 mg/m3和15.0 μg/m3时，NO、SO2和Hg0的同时氧化效率分别达到40%、98%和55%。
