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基于塞曼原子吸收法的燃煤电厂汞排放监测研究

Monitoring of Mercury Emission in Coal-Fired Power Plant Based on Zeeman Atomic Absorption Spectrometry

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摘要

利用横向塞曼效应技术对烟气中的二氧化硫(SO2)、二氧化氮(NO2)等干扰气体进行背景校正。采用基于塞曼效应的汞监测系统测量得到烟气经过湿法脱硫(WFGD)处理系统前后烟气中元素汞(Hg0)的平均质量浓度分别为0.36 μg·m-3和11.08 μg·m-3, 脱硫系统处理后烟气中Hg0浓度显著升高。经分析, 烟气中约99%的SO2被脱硫浆液吸收, 生成足量亚硫酸盐, 亚硫酸盐与Hg2+发生还原反应释放出Hg0;浆液pH值的变化加速Hg2+还原反应并释放Hg0。利用WFGD系统协同脱汞可能导致烟气Hg0排放浓度升高。Hg0排放浓度与烟气中其他成分的浓度均具有一定的相关性, 这与理论分析一致, 表明横向塞曼原子吸收法可以有效去除SO2、NOx等气体的干扰, 验证了应用横向塞曼原子吸收法检测烟气汞含量的准确性与可行性。

Abstract

Background noise from SO2, NO2 and other interfering gases in flue gas is corrected by the transverse Zeeman effect. The mercury concentration in flue gas is determined by Zeeman atomic absorption spectrometry. The average concentrations of element Hg (Hg0) in flue gas before and after wet flue gas desulfurization (WFGD) are 0.36 μg·m-3 and 11.08 μg·m-3. The concentration of Hg0 in flue gas increases significantly after desulfurization system. The monitoring results show that about 99% of SO2 in the flue gas is absorbed by the desulfurization slurry, and produces enough sulphite which reacts chemically with Hg2+ to release Hg0. The change of pH value in the desulfurization slurry also accelerates reduction reaction and release of Hg0. The use of WFGD system to remove mercury can lead to the increase of element mercury concentration. The monitoring results of element mercury have certain correlations with concentrations of other components in the flue gas, which is consistent with the theoretical analysis. The monitoring results show that transverse Zeeman atomic absorption spectrometry can effectively overcome interference caused by SO2, NOx and other gases. The results confirm the accuracy and feasibility of transverse Zeeman atomic absorption spectrometry applied in the detection of mercury content in flue gas.

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中图分类号:P427.1;X831;O433

DOI:10.3788/lop54.080101

所属栏目:大气光学与海洋光学

基金项目:国家重点研发计划(2016YFC0200400)、国家自然科学基金(41605017)、高分专项应用共性关键技术项目(50-Y20A38-0509-15/16)、安徽省高校自然科学研究项目(KJ2013B240)

收稿日期:2017-02-28

修改稿日期:2017-03-30

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张勇:中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031中国科学技术大学研究生院科学岛分院, 安徽 合肥 230026淮北师范大学物理与电子信息学院, 安徽 淮北 235000
司福祺:中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
李传新:中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
曾议:中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
刘文清:中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
周海金:中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031

联系人作者:张勇(yongzhang@aiofm.ac.cn)

备注:张勇(1978-), 男, 博士研究生, 主要从事环境光学监测方面的研究。

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引用该论文

Zhang Yong,Si Fuqi,Li Chuanxin,Zeng Yi,Liu Wenqing,Zhou Haijin. Monitoring of Mercury Emission in Coal-Fired Power Plant Based on Zeeman Atomic Absorption Spectrometry[J]. Laser & Optoelectronics Progress, 2017, 54(8): 080101

张勇,司福祺,李传新,曾议,刘文清,周海金. 基于塞曼原子吸收法的燃煤电厂汞排放监测研究[J]. 激光与光电子学进展, 2017, 54(8): 080101

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