摘要
针对低温条件下SO2对Ca(OH)2吸收NO的影响进行了实验研究,分析了烟气中O2和H2O对SO2促进Ca(OH)2吸收NO的影响。实验结果表明,当烟气不含SO2时,Ca(OH)2对NO基本无吸收作用;烟气中SO2的存在对NO吸收具有促进作用。H2O和O2对SO2促进NO吸收有显著影响;当烟气不含O2时,即使大量的SO2被吸收,NO吸收效率仍较低;只有SO2与O2和H2O共存才能促进NO吸收。脱硫产物CaSO3对NO无氧化作用;NO、H2O和SO2未在吸收剂表面产生可分解释放NO2的大分子中间配合物。分析认为在脱硫过程中产生了可以促进NO与O2反应的非稳定中间活性组分。
The effect of SO2 on NO removal by Ca（OH）2 was investigated at a low temperature.The influence of H2O and O2 on the enhancement effect of SO2 on NO removal was analyzed.The experimental results showed that NO removal was negligible in the absence of SO2.SO2 could enhance NO removal.H2O and O2 have great influence on the enhancement of SO2 on NO removal.NO could not be absorbed by Ca（OH）2 in the absence of O2,even though a high SO2 removal could be attained.SO2 could enhance NO removal when H2O and O2 were present in the flue gas simultaneously.CaSO3,a typical desulfurization reaction product,could not oxidize NO to NO2.The multi-molecular intermediate species,which could decompose to NO2,was not formed from the adsorption of NO,H2O and O2 on the surface of absorbent.There may be some unstable intermediate species formed from the desulfurization reaction,which can accelerate the reaction of NO and O2.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第11期2836-2842,共7页
CIESC Journal
基金
国家高技术研究发展计划项目(2007AA05Z307)~~
关键词
NO氧化
钙基吸收剂
脱硫脱硝
NO oxidization
Ca-based absorbent
removal of SO2 and NO
