Therefore, a comparative study on characterizing PM from both
pulverized coal plant and CFB plant was originally conducted by
Tsinghua group using Andersen 8-stage Impactor [27]. Fig. 3 illustrates
the SEM structures of submicron particles and supermicron
particle from both PC and CFB coal power plants. Morphological
results show that PM2.5 from PC plants, including both supermicron
particles (Fig. 3a) and submicron particles (Fig. 3b), nearly has
regular, spherical shapes.