差分吸收光谱法在线监测烟气SO2浓度的直接反演法-中国电机工程学报.PDF

第 30 卷 第 29 期 中 国 电 机 工 程 学 报 Vol.30 No.29 Oct.15, 2010 74 2010 年 10 月 15 日 Proceedings of the CSEE ©2010 Chin.Soc.for Elec.Eng. 文章编号：0258-8013 (2010) 29-0074-06 中图分类号：TK 314 ；X 830 文献标志码：A 学科分类号：470·20 差分吸收光谱法在 线监测烟气 SO2 浓度的直接反演法 李亚飞，蔡小舒 (上海理工大学颗粒与两相流测量技术研究所，上海市 杨浦区 200093) A Direct Inverse Method to Measure SO Concentration in Flue Gas With 2 Differential Optical Absorption Spectroscopy LI Yafei, CAI Xiaoshu (Institute of Particle and Two-phase Flow Measurement, University of Shanghai for Science and Technology, Yangpu District, Shanghai 200093, China) ABSTRACT: For monitoring emission from utility boilers, the 谱的小波系数基本相同。因此，提出一种差分吸收光谱法测 accuracy of differential optical absorption spectroscopy (DOAS) 量 SO 浓度的新算法，即利用这些波长点的小波分解系数与 2 method is strongly affected by high concentration of dust and 浓度的关系，建立相应的函数关系，由吸收光谱经小波分解 droplets in flue gas. Experiments were carried out in lab to 后的小波系数直接得到 SO2 的浓度。实验证明该方法可以消 simulate the real conditions in chimney. Absorption spectrums 除烟尘水汽等的干扰影响，测量误差较小，可以满足排放监 of SO2 were measured in different conditions, such as high 测要求。 concentration of dust and/or droplets, lower light intensity. Then, measured spectrums were analyzed with wavelet 关键词：烟气；差分吸收光谱法；SO ；小波变换；排放监测 2 transform meth