摘要
基于精细化工、制药行业排出NOx废气氧化度低、氧气含量高的特点，提出以改性活性炭（MAC）为催化剂的催化氧化．还原吸收脱除NOx的方法。考察了相对湿度、氧化温度、氧化时间对NO催化氧化以及还原液种类对NOx吸收的影响。结果表明，随着相对湿度的增加NO转化率急剧下降，但随着氧化时间的延长有所提高；干气条件下，随着温度升高，NO转化率下降；湿气条件下，NO氧化反应最佳反应温度范围为50～70℃，实验条件下的NO最高转化率可达51％；还原液种类中以尿素-碱液对NOx和NO的吸收效果最好，亚硫酸铵-碱液对NO2的吸收效果最好。通过催化氧化-还原吸收的多级组合可实现NOx的有效脱除与达标排放。
Catalytic oxidation-reductive absorption process for NOx removal is proposed according to the fea- ture of low oxidation degree and high content of oxygen of NOx waste gas from fine chemical and pharmaceutical industries. The effects of relative humidity, temperature and reaction time over modified activated carbon on NO oxidation were investigated, and the NOx removal efficiency in different reductive solutions was also discussed. The results showed that the NO conversion in the oxidation process decreased sharply with an increase in relative humidity, but rose with rising reaction time. The maximum NO conversion 51% could be obtained at 50 -70℃ in humid gas, which differ from the descent trend with increasing temperature in dry gas. The reductive absorp- tion experiments indicated that urea was more efficient in absorption of NO and NO, but ammonium sulfite solu- tion was the best one to NO2 absorption. The multi-stage process of catalytic oxidation-reductive absorption in series is practical and effective to NO removal.
出处
《环境工程学报》
CAS
CSCD
北大核心
2008年第9期1207-1212,共6页
Chinese Journal of Environmental Engineering
基金
浙江省科技厅资助项目(2007C23034)
关键词
工业湿气
NO催化氧化还原吸收
NOX脱除
氮氧化物
humid industrial waste gas
NO catalytic oxidation
reductive absorption
NOx removal
ni- tride oxides
