固体高分子脱硝剂选择性非催化还原NO x 特性

doi:10.16085/j.issn.1000-6613.2022-1997

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

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.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.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/Abstract

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

中图分类号:

X701

朱传强, 茹晋波, 孙亭亭, 谢兴旺, 李长明, 高士秋. 固体高分子脱硝剂选择性非催化还原NO _x 特性[J]. 化工进展, 2023, 42(9): 4939-4946.

ZHU Chuanqiang, RU Jinbo, SUN Tingting, XIE Xingwang, LI Changming, GAO Shiqiu. Characteristics of selective non-catalytic reduction of NO _x with solid polymer denitration agent[J]. Chemical Industry and Engineering Progress, 2023, 42(9): 4939-4946.

图/表 7

图1 脱硝剂效果评价实验装置流程1—气瓶；2—阀门；3—质量流量计；4—气体混合器；5—水箱；6—泵；7—蒸气发生器；8—螺旋进料器；9A、9B—冷凝器；10—加热炉；11—反应器；12—挡板；13—旋风分离器；14—锥形烧瓶；15—湿式流量计；16—干燥；17—套管过滤器；18—烟气分析仪；19—计算机

图2 反应温度对脱硝剂脱硝效率的影响

图3 氧气体积分数对脱硝剂脱硝效率的影响

图4 水蒸气浓度对脱硝剂脱硝效率的影响

图5 脱硝剂热分解的TG、DTG曲线

图6 脱硝剂热分解的热重-红外联用三维和二维图

图7 高分子脱硝剂炉内反应路径

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固体高分子脱硝剂选择性非催化还原NO _x 特性

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

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固体高分子脱硝剂选择性非催化还原NO _x 特性

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