In order to compare the particle formation characteristics of typical high-alkali and high-chlorine Xinjiang coal under combustion conditions

a three-stage high temperature drop tube furnace was used to carry out the combustion experiment of Zhundong coal(ZD) and Shaerhu coal(SEH) in air atmosphere. The characteristics of particulate matter after combustion were analyzed. Particulate matters were collected by Dekati low pressure impactor+(DLPI+) and the mass-based particle size distribution

elemental compositions and morphology were discussed. The results showed that the particulate matter produced by the combustion of the two coal samples presents a double-peaked model. The fine particle yield of SEH is significantly higher than that of ZD. The main components of sub-micron particles were Na and Cl. The Cl in PM_(10) accounts for 11.8% and 28.9%of the Cl content in ZD and SEH raw coal

and Na accounts for 2.66% and 7.53% of the Na content in ZD and SEH coal ash. High levels of alkali metals and Cl promoted the formation of fine particles. A large amount of Cl in SEH raw coal migrated into particles and contributed greatly to the formation of sub-micron particles.