AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Evolution of Fine Organic Aerosol Emitted from Residential Coal Combustion
WEI ZHOU, Jingkun Jiang, Jianguo Deng, Lei Duan, Jiming Hao, Tsinghua University
Abstract Number: 153 Working Group: Combustion
Abstract This study reported the evolution of submicron organic particle formed during a complete residential coal combustion process, i.e., from fire start to fire extinction. A residential coal combustion system includes a clean air supply system, a typical Chinese stove, a chamber collection system, and a dilution system. An Aerosol Chemical Speciation Monitor (ACSM) was used to in-situ measure non-reflective components of submicron particles (NR-PM$_1). PM$_(2.5) and PM$_1 samples were collected on quartz filters for off-line analysis. Gaseous pollutants (e.g., CO, CO$_2, NO$_x, and SO$_2) were also measured. Three commonly used coal types were tested, i.e., bituminous, anthracite, and semi-coke coals.
For all three types of coals, the emission of organic particles showed distinct characteristics in terms of four stages, i.e., the heating and ignition stage, fiercely combustion stage, stable combustion stage, and ember combustion stage. For anthracite coals, more than half of total organic particle emission happened during the heating and ignition stage. For bituminous and semi-coke coals, the fractions of organic particles emitted during this first stage are higher than 90%. The mass spectra were dominated by ions from hydrocarbon organic aerosol during this first stage. Concentrations of organic particles decrease rapidly during the fiercely combustion stage and stay at a relative low level during the stable combustion stage. During these two complete combustion stages, significant ion peaks of organic acids were observed. The oxidation degrees of organic particles gradually increases the four stages and organic particles emitted during the last ember combustion stages are the most oxidized. Possible mechanisms for organic aerosols during residential coal combustion were also discussed.