Emission Characteristics of Filterable Particulate Matter and Condensable Particulate Matter by Low Temperature Trapping from Coal-Fired Power Plants

Abstract

Particulate matter emission has been widely concerned all over the world. The formation of condensable particulate matter (CPM) was affected by atmospheric temperature. An optimal-designed sampling device and monitoring method for particulate matter in high-humidity flue gas were applied to the particulate matter emission concentration of 12 ultra-low emission coal-fired units. The emission levels and composition characteristics of particulate matter and main inorganic ions in the flue gas were analyzed and evaluated. The results showed that the filterable particulate matter (FPM) concentration range was 0.81~7.52 mg/m 3 , and the condensable particulate matter concentration range was 1.10~12.25 mg/m 3 . The effects of different air pollution control devices on CPM/FPM were significantly difference. Preferable emission reduction result of condensable particulate matter may be realized by units equipping wet limestone-gypsum flue gas desulphurization and wet electrostatic precipitator. The CPM/FPM was showed a downtrend with the increase of ash content. The inorganic ions concentration range was 1104~8240 μg/m 3 in condensable particulate matter. Ca 2+ concentration accounted for more than 45% of the cations concentration, and SO 4 2- concentration accounted for up to 97.81% of the anions concentration in condensable particulate matter.

Keywords: Air pollution control devices；Condensable particulate matter；Inorganic ions；Emission characteristics；Coal-fired power plant