Effect of oxygen concentration on PM2.5 formation during coal combustion under O2/CO2 atmosphere
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Abstract
Pulverized coals were burned in a tube furnace under O2/CO2 atmosphere, and an electrical low pressure-impactor (ELPI) was used to collect the PM2.5. The results show that a bimodal distribution of PM2.5 appears, which is located at 0.1 μm and 2.0 μm, respectively. The mass concentrations of PM2.5 increase with5 enhancing the O2 concentraion. The enrichment of S, Na and K on the sub-micron particles is observed, but that of Si and Ca is not observed. It is proposed that sub-micron particles are formed via the mechanism of vaporization and condensation, and the super-micron particles are formed by the fragmentation of coal char and the coalescence of inherent mineral matter based on the analyses of particle size distribution, elements distribution and morphology of PM2.5.
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