Characterization of Condensable Nanoparticles Formed at Stationary Sources by Using Dilution Samplers

摘要

Particulate matters less than 2.5 μm (PM2.5) are emitted from various stationary sources such as factories, incinerators and power plants. PM are formed also at stack exits from condensable components of flue gas with dilution and cooling by atmospheric air. The method of condensable PM measurement was standardized as ISO 25297: 2013. In this standard PM2.5 with condensable components was determined using dilution samplers. The researches on dilution samplers, which can simulate atmospheric emissions of the flue gas, and sampled results are quite limited and sampler structure and sampling conditions, such as sample gas to air dilution ratio (DR) and residence time of diluted sample in a sampler, have not been validated well. The objective of this research is to reveal the formation mechanism of condensable PM by model flue gas and real exhaust gas measurements and to evaluate the contribution of condensable components for total PM2.5 emission along with the examination of sampler and sampling conditions.