Emission factors of PAHs in residential coal combustion in China
国内民用燃煤烟气中多环芳烃排放因子研究

Emission characteristics of polycyclic aromatic hydrocarbons (PAHs) emitted from combustion of six types residential coal briquettes, including emission factors, partitioning between solid and gas phases, component profile and influence of burning methods, were investigated. The results indicate that, based on 15 parent PAH species, the average total PAH emission factors (EFs) ranged from 71 to 882 mg·kg-1. Both EF values and emission amounts for bituminous coal, honeycomb coal and anthracite showed a decreasing sequence. Particulate phases contributed most of the total carcinogenicity of the PAHs emitted. Positive correlations between ratios of gas to particulates and saturated steam pressures for the PAH compounds were generally significant at a statistical level of 0.05. EFs, partitioning between gas and particulate phases and profiles of PAH emissions were critically affected by residential coal types and the volatile contents of the coals. In addition, different combustion stoves and burning methods also influenced the corresponding EFs. Lack of oxygen supply may lead to an increase of PAH emissions of about 1 order of magnitude.