[Application of a Two-stage Virtual Impactor in Measuring of PM₁₀ and PM_2.5 Emissions from Stationary Sources]

Recently, the Ministry of Environmental Protection of China started the development of emission inventories in fifteen Chinese cities. It includes the esmission of PM₁₀ and PM_2.5 from stationary sources. However, there is no national standard method in China for stationary source PM₁₀ and PM_2.5 sampling. In this study, a two-stage virtual impactor was developed for sampling PM₁₀ and PM_2.5 from stationary sources. Its performance was evaluated for four types of sataionary sources, i.e., coal-fired power plant, waste incineration, circulating fluid bed, and converter steelmaking. These four tested emission sources were equipped with high efficiency PM control devices. PM_2.5 mass concentrations measured in the chimneys of these emission sources were (0.93±0.03), (3.3±0.65), (0.59±0.04), and (0.15±0.04) mg·m^-3, respectively, while the PM₁₀ mass concentrations were (1.13±0.11), (6.9±0.86), (1.12±0.16), and (0.43±0.15) mg·m^-3, respectively.