The emission of inhalable particulates

especially fine particles concentrated with rich toxic trace elements from coal-fired power plant results in serious harm to the environment and human health.Particulate sampling was conducted on two coal-fired boilers equipped with wet FGD.The results showed that

the particulate matter generated from these two boilers was trimodally distributed

among which the fine mode particles mainly contained the elements Na and Mg

while the centrol mode and coarse mode particles mainly consisted of the elements Si and Al.After the particulates carried by flue gas entered into the WFGD device

the fine particle emissions increased due to the transformation from external elemental Ca and S into fine particles

while the emission of coarse particulates decreased as the result of physical washing by limestone slurry.