Abstract
ABSTRACT
A bench-scale system consisting of a high-temperature flow reactor was used to study aerosol formation and growth in a multicomponent system containing lead species. The effect of chlorine on the resultant particle size distribution was studied by varying the chlorine to lead (Cl/Pb) ratio. The particle size was observed to increase as the Cl/Pb ratio increases. Species such as laurionite and lead oxide chloride hydrate were observed at intermediate Cl/Pb ratios for high lead feed rates, revealing the role of hydroxide radicals in the oxidation processes and the occurrence of multicomponent nucleation of miscible lead species. For lower lead feed rates, the number and volume concentrations increased as the Cl/Pb ratio increased; for higher feed rates, they reached a maximum at intermediate Cl/Pb ratios, then decreased upon a further increase of Cl/Pb ratios. Coagulation and condensation characteristic times were also calculated to study the importance of various mechanisms in the system. Condensation was found to be the main mechanism for aerosol growth of lead species. A two-component log-normal model incorporating three previously reported nucleation theories was used to study lead aerosol formation and growth.
Key words:
High-temperature flow reactor; Cl/Pb ratio; feed rates
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