Study on the Deposits Derived from a Biomass Circulating Fluidized-Bed Boiler

Biomass tends to form deposits and tends to slag during combustion. This study focused on deposits obtained from a circulating fluidized bed (CFB) in a biomass power plant. Analyses using scanning electron microscopy, energy-dispersive spectrometry, and X-ray diffraction are also included. The results indicate that the deposits are dense with a certain hardness, which resulted from the erosion of particles in the CFB. The deposits are high in K, Na, Cl, and Ca, whereas Si, Al, Mg, and S contents are relatively lower. KCl and K 2 SO 4 are the main components of the deposits. The particles in the flue are captured by the viscous layer that was formed by the condensation of gaseous KCl and K 2 Ca(SO 4 ) 2 on the surface of the tubes. Moreover, deposits are formed under the effect of the adhesion and capturing processes, in alternation.