Abstract
Condensable particulate matter (CPM) and uncaptured fine filterable particulate matter (FPM) from various stationary coal-fired sources cause haze weather to harm human health. In this study, we measured the emissions of FPM, CPM, and polycyclic aromatic hydrocarbons (PAHs) from household stoves, small-capacity boilers, and industrial-scale circulating fluidized bed (CFB) boilers. CFB systems installed with dry and semidry flue gas desulfurization (FGD) systems and ammonia-based NOx control systems (SCR/SNCR) emit lesser filterable PM but substantially higher CPM than household stoves and small-capacity boilers. The results indicate that these air emission control technologies have side effects on promoting the generation and emission of CPM, which is rich in (NH4)2SO4 and NH4HSO4. CFB boilers with wet FGD technology exhibit lower CPM emission, suggesting the positive effects of dissolving and absorbing of gypsum slurry on CPM emission. Various small coal-fired stoves burning different types of coal do not significantly affect CPM but the PAHs emissions. Based on the data of this investigation, we estimated the emission inventory of CPM from various stationary coal-fired sources, aiming to provide valuable insights into setting priorities for improving the atmospheric environment in China.
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