化工进展 ›› 2023, Vol. 42 ›› Issue (9): 4967-4973.DOI: 10.16085/j.issn.1000-6613.2022-1970

• 资源与环境化工 • 上一篇    下一篇

二乙烯三胺五亚甲基膦酸/Fenton体系氧化脱除NO

白志华(), 张军()   

  1. 东南大学能源与环境学院,江苏 南京 210096
  • 收稿日期:2022-10-21 修回日期:2022-12-22 出版日期:2023-09-15 发布日期:2023-09-28
  • 通讯作者: 张军
  • 作者简介:白志华(1998—),男,硕士研究生,研究方向为一体化脱硫脱硝。E-mail:220200504@seu.edu.cn

Oxidative removal of NO in DTPMPA/Fenton system

BAI Zhihua(), ZHANG Jun()   

  1. College of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2022-10-21 Revised:2022-12-22 Online:2023-09-15 Published:2023-09-28
  • Contact: ZHANG Jun

摘要:

针对当前Fenton氧化法脱除燃煤烟气中 NO的过程中H2O2大量无效分解生成氧气的缺点,本文采用二乙烯三胺五亚甲基膦酸(DTPMPA)/Fenton系统进行氧化脱除NO的实验研究。结果表明:该系统在NO脱除效率为95.1%的情况下,H2O2无效分解占比降低至15.5%。DTPMPA浓度的增加抑制了H2O2无效分解,其浓度较低时促进NO脱除而浓度较高时抑制NO脱除;H2O2及Fe2+浓度的增加均对NO脱除及H2O2无效分解有一定的促进作用,但二者浓度过高时亦均对脱除NO有一定抑制作用;降低反应温度对NO脱除影响较小,但会削弱H2O2无效分解;SO2对NO的脱除及H2O2无效分解影响甚小。电子自旋共振技术和淬灭剂添加实验结果表明:DTPMPA的添加提高了Fenton系统中·OH自由基和·O2-自由基的含量,且·O2-自由基为脱除NO的主要活性物质,·O2- + HO· O2 + HO-为氧气生成的主要途径。反应产物离子色谱表明:NO在反应过程中被氧化为NO2-和NO3-

关键词: 芬顿法, 二乙烯三胺五亚甲基膦酸, 自由基, 脱硝, 无效分解

Abstract:

In view of the current Fenton oxidation method to remove NO in coal-fired flue gas, a large amount of H2O2 ineffectively decomposes to generate oxygen, the DTPMPA (diethylenetriamine pentamethylphosphonic acid) /Fenton system was used to oxidize and remove NO. The results showed that when NO removal efficiency of the system was 95.1%, the proportion of H2O2 ineffective decomposition decreased to 15.5%. The increase of DTPMPA concentration inhibited H2O2 ineffective decomposition, and it promoted NO removal when the concentration was low but inhibited NO removal when the concentration was high. The increase of H2O2 and Fe2+ concentrations had a certain promoting effect on NO removal and H2O2 ineffective decomposition, but when the concentration of both was too high, it also had a certain inhibitory effect on NO removal. Lower reaction temperature had little effect on NO removal, but weakened H2O2 ineffective decomposition. SO2 had little effect on NO removal and H2O2 ineffective decomposition. Electron spin resonance technology and quenching addition experiments showed that the addition of DTPMPA increased the content of ·OH radicals and ·O2- radicals in the Fenton system, ·O2- radicals were the main active species for NO removal, and the main pathway of oxygen generation was ·O2- + HO· O2 + HO-. Ion chromatography of the reaction products showed that NO was oxidized to NO2- and NO3- during the reaction.

Key words: Fenton, diethylenetriamine pentamethylphosphonic acid, radical, denitration, ineffective decomposition

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn