摘要
将脱硫塔产生的高浓度亚硫酸铵氧化为硫酸铵是氨法脱硫研究的一个难点。利用二氧化氮(NO2)的氧化性,可以有效氧化高浓度的亚硫酸铵。空气中电弧放电可以产生氮氧化物(NOx),本研究采用高频交流电源,不锈钢针-针电极,研究了放电间距、气体流量、湿度和O2含量等参数对产物NOx的浓度和NO2/NOx比值的影响,并对产物气体做了红外分析和光谱分析。实验结果表明,放电间距增大有利于NOx浓度和NO2/NOx的提高,气体流量和湿度的增大使NOx浓度和NO2/NOx降低,O2含量为50%和60%时NO2浓度和NO2/NOx分别达到最大值。产物NOx对亚硫酸铵的氧化速率最高可达0.0264 mol/(L·min)。
In wet ammonia FGD process,its byproduct of concentrated ammonium sulfite is hard to be oxidized to ammonium sulfate. The concentrated ammonium sulfite can be effectively oxidized by nitrogen dioxide,which can be generated by arc discharge in air. In this study,NOxwas generated by a high frequency AC power source and a pair of needle-needle stainless steel electrodes. Parameters which could influence the NOxconcentration and the ratio of NO2/ NOxwere investigated,such as discharge gap,air flux,humidity,and oxygen content.Discharge gas products were analyzed by fiber optic spectrometer and FTIR for better understanding. Results show that NOxconcentration and NO2/ NOxcould be improved by increasing discharge gap or reducing gas flux and humidity. The value of NO2 concentration and NO2/ NOxratio increased to their peaks when oxygen content was 50%and 60%,respectively. The maximum oxidation rate of ammonium sulfite by NOxwas 0. 0264 mol /( L·min).
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第1期281-287,共7页
Chinese Journal of Environmental Engineering
基金
国家“863”高技术研究发展计划项目(2009AA064101)
