• 关键词：液相氧化  吸收  NaClO₂  NO_x脱除

• 基金项目：国家高技术研究发展计划课题(No. 2012AA062503);国家自然科学基金资助项目(No. 21377009)

• 齐震
• 北京航空航天大学化学与环境学院, 北京 100191

• 孙也
• 北京航空航天大学化学与环境学院, 北京 100191

• 樊星
• 北京工业大学环境与能源工程学院, 北京 100124

• 朱天乐
• 北京航空航天大学化学与环境学院, 北京 100191

• 摘要：分别采用NaClO₂和Na₂SO₃溶液作为氧化液和吸收液,在自行设计的鼓泡塔反应系统进行了液相氧化-吸收脱除模拟烟气NO_x的研究,考察了气相SO₂浓度、NaClO₂和Na₂SO₃投加量以及pH值等因素对NO氧化和NO_x脱除的影响.结果表明,SO₂会优先于NO与氧化剂反应,从而增大氧化剂消耗量.偏酸性条件有利于NO氧化,但酸性太强会导致NaClO₂分解为ClO₂逸出.碱性吸收液对NO几乎不具吸收脱除效果,但共存NO₂能促进NO的吸收脱除.SO₂对NO₂吸收脱除具有促进作用.

• Abstract：Removal of NO_x from simulated flue gas by aqueous-phase oxidation combined with absorption was studied in a self-designed bubble reaction system when NaClO₂ and Na₂SO₃ solution were used as oxidant and absorbent solution, respectively. The effects of gas-phase SO₂ concentration, Na₂SO₃ and NaClO₂ dosages and pH on NO oxidation and NO_x removal were investigated. The results show that the presence of SO₂ is favorable for NaClO₂ consumption because SO₂ reacts with oxidant more easily than NO. NO is easily oxidized into NO₂ under low pH conditions, but also decomposes more NaClO₂ into ClO₂. Partial NO is absorbed by alkaline solution in the presence of NO₂ while this absorption reaction does not occur in the absence of NO₂. SO₂ promotes the absorption removal of NO₂.

• Key words：aqueous-phase oxidation  absorption  NaClO₂  NO_x removal

• 
  摘要点击次数： 1366 全文下载次数： 3625