Abstract
Fine particulate matter (PM2.5) was sampled at the furnace outlet of a 660 MW boiler using a two-stage sampling dilution system. The number and mass concentrations of PM2.5 were measured at different applied loads using an electrical low-pressure impactor to determine how boiler load affects PM2.5 production. Size-segregated elemental compositions of particles were measured by energy-dispersive X-ray spectroscopy. The results indicate that PM2.5 contains both ultrafine and central-mode particles. The number concentration depends on the ultrafine particles (PM0.38), and the mass concentration depends on the central-mode particles (PM0.38–2.5). The Na, S, and Ca concentrations decrease with increasing particle size, but Si, Al, and K concentrations in the central-mode particles are higher than in the ultrafine mode. The Fe and Mg concentrations are roughly independent of particle size. The trends of elemental behavior suggest that the central-mode particles are primarily formed from fine residual ash partic...
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