UV/H2O2氧化联合CaO吸收脱除NO的传质-反应动力学

doi:10.3969/j.issn.0438-1157.2013.03.039

化工学报 ›› 2013, Vol. 64 ›› Issue (3): 1062-1068.DOI: 10.3969/j.issn.0438-1157.2013.03.039

UV/H₂O₂氧化联合CaO吸收脱除NO的传质-反应动力学

刘杨先¹, 潘剑锋¹, 刘勇²

1. 江苏大学能源与动力工程学院,江苏镇江 212013;
2. 杭州市节能技术设计研究所有限公司,浙江杭州 310000

收稿日期:2012-05-19 修回日期:2012-09-23 出版日期:2013-03-05 发布日期:2013-03-05
通讯作者: 刘杨先(1984—),男,博士,讲师。
作者简介:刘杨先(1984—),男,博士,讲师。
基金资助:
国家自然科学基金项目(51206067);江苏省"企业博士集聚计划"项目;教育部博士点新教师基金项目(20123227120016);江苏省高校优势学科建设工程资助项目。

Mass transfer-reaction kinetics for NO removal by combination process of UV/H₂O₂ oxidation and CaO absorption

LIU Yangxian¹, PAN Jianfeng¹, LIU Yong²

1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
2. Hangzhou Energy Engineering Design Co., Ltd., Hangzhou 310000, Zhejiang, China

Received:2012-05-19 Revised:2012-09-23 Online:2013-03-05 Published:2013-03-05
Supported by:
supported by the National Natural Science Foundation of China(51206067).

摘要/Abstract

摘要： 在实验室规模的光化学反应器中,基于实验研究﹑动力学理论以及双膜理论,研究了UV/H₂O₂氧化联合CaO吸收(UV/H₂O₂-CaO工艺)脱除燃煤烟气中NO的传质-反应动力学。分析了NO吸收的传质-反应过程,明确了NO吸收过程的主要控制步骤和强化措施,测定了关键的动力学参数,推导了NO吸收过程的理论模型。结果表明:在实验范围内,NO吸收速率随着NO浓度的增加几乎呈线性增加。随着H₂O₂浓度和CaO浓度的增加,NO的吸收速率均呈现先增加后变缓的趋势。UV/H₂O₂-CaO工艺脱除NO是一个拟一级快速反应过程,强化气相主体扰动﹑增加气液接触面积和提高NO分压可有效提高NO的吸收速率。NO吸收速率方程的计算值和实验值具有较好的一致性。

关键词: 紫外线/过氧化氢, 氧化, 一氧化氮, 氧化钙, 传质-反应动力学

Abstract: Based on experimental results,kinetics and two-film theory,the mass transfer-reaction kinetics was experimentally studied for NO removal using a combination process of UV/H₂O₂ oxidation and CaO absorption(UV/H₂O₂-CaO process) in a lab-scale UV-bubbling column reactor.The mass transfer-reaction process of NO absorption was analyzed to determine its rate controlling step and some measures that can effectively strengthen NO absorption,and some key kinetic parameters were measured and a theoretical model for NO absorption was established.The results indicate that under experimental conditions,the rate of NO absorption almost linearly increases with NO concentration.With increase of H₂O₂ and CaO concentrations,the efficiencies of NO removal increase greatly at first,and then its change is small.The absorption of NO by combined UV/H₂O₂-CaO process follows pseudo-first-order kinetics.The NO absorption rate can be effectively strengthened by increases of turbulence in gas phase body,gas-liquid contact area and NO partial pressure.The values calculated from the theoretical model of NO absorption are in good agreement with the experimental values.

Key words: UV/H₂O₂, oxidation, NO, CaO, mass transfer-reaction kinetics

中图分类号:

TK16

刘杨先, 潘剑锋, 刘勇. UV/H₂O₂氧化联合CaO吸收脱除NO的传质-反应动力学[J]. 化工学报, 2013, 64(3): 1062-1068.

LIU Yangxian, PAN Jianfeng, LIU Yong. Mass transfer-reaction kinetics for NO removal by combination process of UV/H₂O₂ oxidation and CaO absorption[J]. CIESC Journal, 2013, 64(3): 1062-1068.

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UV/H₂O₂氧化联合CaO吸收脱除NO的传质-反应动力学

Mass transfer-reaction kinetics for NO removal by combination process of UV/H₂O₂ oxidation and CaO absorption

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