Abstract
In order to improve the reliability of optical-based PM concentration measurements, the optical properties of PM such as the dimensionless light extinction coefficient must be well defined. However, the optical properties of PM produced from burning coal are lacking. Therefore, in this study, the dimensionless light extinction coefficient measurements and optical characterization analysis of PM generated from burning bituminous coal at elevated reaction temperatures were performed. Bituminous coal in the form of powder was burned in a muffle furnace and PM released from flame was then collected on a quartz filter. Morphological investigations through the TEM images and elemental and organic carbon ratio analysis were performed to quantitatively investigate the optical properties of PM. Experimental results clearly indicate that increases in the reaction temperature can increase graphitic nature and morphological dimension (represented by an optical diameter) of PM, eventually enhancing the effects of absorption and scattering of the light and the measured dimensionless light extinction coefficient of PM.
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