On a self-designed open burning experiment platform in laboratory scale

the emission factors of particulate matter(PM) and gaseous pollutants from three types of crop straws(wheat

rice and corn) were detected

in flaming and smoldering combustion states with different water contents. The results show that

during flaming combustion

the emission factors of the total solid particles(TSP) of the wheat

rice and corn were 11.36~18.00

9.20~13.76 and 8.94~15.19

and that of the CO were 43.55~61.57 g/kg

50.36~79.24 g/kg and 58.51~70.05 g/kg

respectively. While that during smoldering combustion were 28.68~48.05

34.85~46.32 and 36.44~51.38 for TSP and 80.72~114.92 g/kg

86.86~108.79 g/kg and 79.73~98.20 g/kg for CO. It was demonstrated that fine PM dominated the total PM from the straw's open burning

and the proportion of PM2.5 to the TSP ranged from 58.72% to 83.07%. Water content were found to be negatively correlated with the emission factors of the PM and CO.