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A New Angular Light Scattering Measurement of Particulate Matter Mass Concentration for Homogeneous Spherical Particles

State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Sensors 2019, 19(10), 2243; https://doi.org/10.3390/s19102243
Received: 12 April 2019 / Revised: 6 May 2019 / Accepted: 7 May 2019 / Published: 15 May 2019
(This article belongs to the Section Optical Sensors)
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Abstract

Under the condition of ultra-low emission for power plants, the particulate matter concentration is significantly lower than that of typical power plants a decade ago, which posed new challenges for the particulate matter monitoring of stationary emission. The monitoring of particulate matter mass concentration based on ensemble light scattering has been found affected by particle size. Thus, this study develops a method of using the scattering angular distribution to obtain the real-time particle size, and then correct the particulate matter concentration with the real-time measured particle size. In this study, a real-time aerosol concentration and particle size measurement setup is constructed with a fixed detector at the forward direction and a rotating detector. The mass concentration is measured by the fixed detector, and the particle size is measured from the intensity ratio of the two detectors. The simulations show that the particle size has power law functionality with the angular spacing of the ripple structure according to Mie theory. Four quartz aerosols with different particle size are tested during the experiment, and the particle size measured from the ripple width is compared with the mass median size measured by an electrical low pressure impactor (ELPI). Both techniques have the same measurement tendency, and the measurement deviation by the ripple width method compared with ELPI is less than 15%. Finally, the measurement error of the real-time mass concentration is reduced from 38% to 18% with correction of the simultaneously measured particle size when particle size has changed. View Full-Text
Keywords: particle size; mass concentration; real-time measurement; light scattering; ripple width particle size; mass concentration; real-time measurement; light scattering; ripple width
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, D.; Liu, X.; Han, J.; Jiang, M.; Wang, Z.; Qi, J. A New Angular Light Scattering Measurement of Particulate Matter Mass Concentration for Homogeneous Spherical Particles. Sensors 2019, 19, 2243.

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