Evolution of aerosol emissions from coal-fired power plants by coagulation,condensation,and gravitational settling and health impact

摘要

This paper studies the scavenging efficiencies of aerosol emissions from Coal-fired Power Plants after a given mechanism of removal (coagulation,heterogeneous nucleation and gravitational settling)as a function of time.It also analyses the "health impact"of the aerosol before and after the above dynamic mechanisms by comparing the respirable dust fractions.The well-known equations of evolution are applied to an average particle size distribution (PSD)that represents the exhaust particulate emissions from Coal-fired Power Plants (i.e.Abono Power Plant in Asturias that belongs to Hidrocantabrico Group,S.A.).From this study it is inferred that respirable dust is hardly scavenged and when compared with the initial volume of respirable dust,roughly 20% remains after 18 h of gravitational settling.Therefore,gravitational settling is the main removal mechanism of respirable dust compared to condensation and coagulation.