光谱学与光谱分析, 2009, 29 (4): 1036, 网络出版: 2010-05-25  

算法融合的差分吸收光谱法烟气SO2浓度在线监测研究

Research on In-Situ Monitoring of SO2 Concentration in the Flue Gases with DOAS Method Based on Algorithm Fusion
作者单位
东南大学能源与环境学院, 江苏 南京 210096
摘要
过去几十年中差分吸收光谱技术(differential optical absorption spectroscopy, DOAS)在大气污染物监测方面取得了成功应用。 文章提出了根据差分吸光度最大值(OD′m)设定阈值的思想, 将传统DOAS算法与基于卡尔曼滤波的DOAS算法相结合, 利用两种算法在相同信噪比下具有不同反演精度的特点, 在保证测量精度的前提下提高了DOAS系统的检测极限, 较好地解决了短光程下低浓度气体的测量精度问题。 在常温常压和流动状态下, 对烟气中的SO2浓度测量进行了理论和实验研究。 研究结果表明, 改进的DOAS算法在OD′m<0.048 1时, SO2浓度测量精度较高, 测量下限可低于28.6 mg·m-3, 零点漂移低于2.9 mg·m-3; 传统DOAS算法在0.048 10.927 2时的SO2浓度测量都存在较大的误差, 必须进行线性度校正。
Abstract
Valuable achievements on differential optical absorption spectroscopy (DOAS) for monitoring atmospheric pollutants gas have been made in the past decades. Based on the idea of setting the threshold according to the maximum value, symbolized as OD′m, of differential optical density, the algorithm of traditional DOAS was combined with the DOAS algorithm based on the kalman filtering to improve the detection limit without losing measurement accuracy in the present article. Two algorithms have different inversion accuracy at the same ratio of signal to noise and the problem of inversion accuracy was well resolved by combining two algorithms at short light path length. Theoretical and experimental research on the concentration measurement of SO2 in the flue gases was carried out at the normal temperature and atmospheric pressure. The research results show that with the OD′m less than 0.048 1, the measurement precision is very high for SO2 with the improved DOAS algorithm. The measurement lower limit of SO2 is less than 28.6 mg·m-3 and the zero drift of the system is less than 2.9 mg·m-3. If the OD′m is between 0.048 1 and 0.927 2, the measurement precision is high with the traditional DOAS algorithm. However, if the OD′m is more than 0.922, the errors of measurement results for both two DOAS algorithms are very large and the linearity correction must be performed.

汤光华, 许传龙, 邵理堂, 杨道业, 周宾, 王式民. 算法融合的差分吸收光谱法烟气SO2浓度在线监测研究[J]. 光谱学与光谱分析, 2009, 29(4): 1036. TANG Guang-hua, XU Chuan-long, SHAO Li-tang, YANG Dao-ye, ZHOU Bin, WANG Shi-min. Research on In-Situ Monitoring of SO2 Concentration in the Flue Gases with DOAS Method Based on Algorithm Fusion[J]. Spectroscopy and Spectral Analysis, 2009, 29(4): 1036.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!