﻿ 角散射低质量浓度烟尘在线测量系统设计
 光学仪器  2018, Vol. 40 Issue (1): 8-12 PDF

Design of on-line measurements system of low concentration dust based on angle scattering
YU Tianze, YANG Bin, WANG Ting, CAI Xiaoshu
Institute of Particle and Two-phase Flow Measurement, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract: For on-line monitoring of low concentration dust emission in coal-fired power plant, the particle size characteristic was summarized.According the simulations of particle scattering, the on-line measurement system of low concentration dust based on angle scattering was designed and applied to experimental measurements.The proportional relationship between light intensity and dust concentration has been verified.This linear relationship has been obtained by fitting and the fitting factor R2 is 0.972.It provides the basis for further application of on-line monitoring of low concentration dust emission in coal-fired power plant.
Key words: environment monitoring     atmosphere emission     dust     on-line measurement     angle scattering

1 角散射烟尘质量浓度测量原理

Mie理论是对处于均匀介质中的各项均匀同性的单个介质球在单色平行光照射下的麦克斯韦方程边界的严格数学解。假设入射光为完全偏振光, 观察点与散射颗粒的距离为r, 入射光振动面与散射面之间夹角为φ, 那么颗粒的总散射光强Is

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 图 1 0.1 μm颗粒散射光强 Figure 1 0.1 μm scattering light intensity

 图 2 3 μm颗粒散射光强 Figure 2 3 μm scattering light intensity

 图 3 同质量浓度下颗粒群的散射光强 Figure 3 Scattering intensity of particle group at the same mass concentration

 图 4 湿式静电除尘器出入口颗粒质量浓度对比 Figure 4 Comparison of WESP inlet and outlet particle concentration
2 实验装置

 图 5 实验光路 Figure 5 Optical path of the experiment

 图 6 实验装置图 Figure 6 Diagram of the experimental setup
3 实验结果与分析

 图 7 实验结果图 Figure 7 Experimental result chart

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 图 8 光强-质量浓度关系图 Figure 8 Light-concentration diagram

4 结论

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