化工进展 ›› 2023, Vol. 42 ›› Issue (9): 4939-4946.DOI: 10.16085/j.issn.1000-6613.2022-1997

• 资源与环境化工 • 上一篇    下一篇

固体高分子脱硝剂选择性非催化还原NO x 特性

朱传强1,2(), 茹晋波1, 孙亭亭1, 谢兴旺1, 李长明3, 高士秋2   

  1. 1.光大环境科技(中国)有限公司,焚烧技术研究所,江苏 南京 211100
    2.中国科学院过程工程研究所,多相复杂系统国家重点实验室,北京 100190
    3.北京工商大学生态环境学院,北京 100048
  • 收稿日期:2022-10-25 修回日期:2023-04-24 出版日期:2023-09-15 发布日期:2023-09-28
  • 通讯作者: 朱传强
  • 作者简介:朱传强(1987—),男,博士,高级工程师,主要从事大气污染防治研究。E-mail:zhucq@ebchinaintl.com.cn
  • 基金资助:
    国家重点研发计划(2018YFC1901300);海南省重点研发专项(ZDYF2022SHFZ315)

Characteristics of selective non-catalytic reduction of NO x with solid polymer denitration agent

ZHU Chuanqiang1,2(), RU Jinbo1, SUN Tingting1, XIE Xingwang1, LI Changming3, GAO Shiqiu2   

  1. 1.Everbright Environmental Technology (China) Co. , Ltd. , Incineration Technology Research Institute, Nanjing 211100, Jiangsu, China
    2.State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS, Beijing 100190, China
    3.School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China
  • Received:2022-10-25 Revised:2023-04-24 Online:2023-09-15 Published:2023-09-28
  • Contact: ZHU Chuanqiang

摘要:

在流化床反应器中研究了固体高分子脱硝剂选择性非催化还原(PNCR)脱硝效率、影响因素及反应机理。结果表明,固体脱硝剂炉内发生非催化还原反应,在850~1150℃范围内,随着温度升高,脱硝效率逐步增加,在950℃达到最佳(97%左右),之后脱硝剂主要受高温氧化反应的影响,脱硝效率下降。氧气不利于脱硝反应,随着氧气的增加,脱硝效率逐渐降低;水蒸气加入能减弱O2的氧化作用,延迟脱硝剂的高温氧化反应。固体脱硝剂热分解过程的O元素主要以CO2形式析出,N和C元素生成NH、CH2和CN等自由基,CH2和CN则通过与O2、O和OH反应而消耗炉内强氧化性基团,抑制NO的生成,加快NH等自由基与NO还原反应而实现高效脱硝。该研究结果为高分子脱硝技术的应用提供了理论支撑和技术参考。

关键词: 高分子非催化还原, 选择性, 聚合物, 还原, 脱硝效率

Abstract:

The denitration efficiency, influencing factors and reaction mechanism of selective non-catalytic reduction of NO x with solid polymer denitration agent (PNCR) were explored in a fluidized bed reactor. The results showed that the denitration using solid denitration agent was mainly a non-catalytic reduction reaction. As temperature increased from 850℃ to 1150℃, the denitration efficiency increased with temperature, with the highest denitration efficiency of 97% at 950℃, and then the denitration efficiency decreased due to the high-temperature oxidation. The reaction did not need the oxygen and the denitration efficiency gradually decreased as the oxygen concentration increased. Steam addition could weaken the oxidation of denitration agent by O2 and delay the high-temperature oxidation reaction. In the thermal decomposition of solid denitration agent, O element mainly escaped in the form of CO2. And N and C elements were converted into active free radicals such as NH, CH2 and CN. CH2 and CN could react and thus consumed the strong oxidizing groups (e.g., O2, O and OH) in the furnace, and inhibit the formation of NO, which might further accelerate the reduction reaction of NH and other free radicals with NO to achieve high denitration efficiency. The research results could provide theoretical support and technical reference for the applications of polymer denitration technology.

Key words: polymer non-catalytic reduction (PNCR), selectivity, polymers, reduction, denitration efficiency

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