光学学报, 2017, 37 (5): 0501002, 网络出版: 2017-05-05  

基于横向塞曼效应的烟气汞在线监测系统

Flue Gas Mercury Online Monitoring System Based on Transverse Zeeman Effect
作者单位
1 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
2 中国科学技术大学研究生院科学岛分院, 安徽 合肥 230026
3 淮北师范大学物理与电子信息学院, 安徽 淮北 235000
摘要
为了解决燃煤烟气汞监测困难的问题, 搭建了基于横向塞曼效应的烟气汞在线监测系统。当自然汞灯光源处于磁感应强度为1.5 T强磁场中时, 塞曼效应使得253.65 nm共振吸收线分裂为π和σ±线偏振光。利用汞原子吸收π线偏振光但不吸收σ±线偏振光的特性, 可实现对干扰气体和颗粒物等干扰背景的精确校正, 系统的探测下限为66.3 ng/m3。当烟气中二氧化氮气体的体积分数不高于5.09×10-4、二氧化硫的体积分数不高于1.83×10-4时, 系统的汞检测不受影响。对燃煤电厂的烟气汞排放进行了连续8 d的监测, 得到烟气汞的平均质量浓度为8.3 μg/m3, 质量浓度最大值为19.4 μg/m3, 均低于国家标准的规定值。实验结果表明, 烟气汞在线监测系统可对烟气中的干扰气体以及颗粒物等进行精确背景校正, 实现烟气汞的准确测量, 满足复杂烟气环境下对汞的长期在线监测。
Abstract
In order to solve the problem of coal flue gas mercury monitoring, an online monitoring system for flue gas mercury is established based on transverse Zeeman effect. When a mercury lamp is placed in magnetic field with magnetic induction intensity of 1.5 T, the resonant absorption line at 253.65 nm is split into π and σ± linearly polarized light because of Zeeman Effect. Mercury atom can absorb π linearly polarized light but can not absorb σ± linearly polarized light, so the system can realize the accurate correction for interference background including the interference gases, particulate matter and so on. The low detection limit of this system is 66.3 ng/m3. The mercury detection is not affected when the volume fraction of NO2 gas is not larger than 5.09×10-4 and the volume fraction of SO2 gas is not larger than 1.83×10-4. The monitoring for flue gas mercury in coal-fired power plant lasts 8 days. The average mass concentration of 8.3 μg/m3 and maximum mass concentration of 19.4 μg/m3 of flue gas mercury are obtained, and they are lower than that in national standard. The experimental results show that the flue gas mercury online monitoring system can realize accurate correction for background interference which is caused by interference gases and particulate matter, and realize accurate measurement for flue gas mercury. The system is proper to be used for long-term online monitoring of flue gas mercury.

张勇, 司福祺, 李传新, 曾议, 刘文清, 周海金. 基于横向塞曼效应的烟气汞在线监测系统[J]. 光学学报, 2017, 37(5): 0501002. Zhang Yong, Si Fuqi, Li Chuanxin, Zeng Yi, Liu Wenqing, Zhou Haijin. Flue Gas Mercury Online Monitoring System Based on Transverse Zeeman Effect[J]. Acta Optica Sinica, 2017, 37(5): 0501002.

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