多轴DOAS断层扫描技术重构工业排放空间分布

Reconstruction of Spatial Distributions of Industrial Emissions Based on Scaning Multi-Axis DOAS Tomography

针对工业烟囱排放污染气体空间分布难以实时获取的问题,开发了基于多轴差分吸收光谱(DOAS)断层扫描系统,结合重构算法,可形成可视化的工业气体烟羽垂直断面浓度的空间分布图。该方法是在烟羽两边分别放置一台定时多轴扫描DOAS,同时在扇形光束射线几何模式下,对烟羽的同一垂直断面扫描。以精确反演的线积分浓度为投影向量,基于平滑基函数最小算法,重构烟羽空间分布,给出重构烟羽断面数值模拟图,并讨论断层重构装置的使用范围。将该系统应用到外场实验中,重构了电厂排放NO2烟羽空间分布。

The spatial distributions of industrial emissions are difficult to get to reconstruct emissions of industrial chimneys in real time. A method is developed to reconstruct spatial distributions of emissions of industrial chimneys based on timing scanning multi-axis differential optical absorption spectroscopy（MAX-DOAS）, combined with computed tomography. Visual spatial distribution of concentrations of industrial gas plume vertical section is formed in this paper. The scanning MAX-DOAS are placed on each side of industrial chimneys. The beam ray geometry configuration and line integral concentrations for projection are used to reconstruct spatial distribution of industrial emissions, based on algorithm of smooth basis function minimization（SBFM）. The simulated distributions of the plume are given. The applied fields of reconstruction device are also discussed. Finally, this system is used to reconstruct emissions of NO2 of power plant the in field campaign.