Co-combustion test of Zhundong lignite and panicum virgatum mixed fuel was carried out in circulating fluidized bed (CFB)

the morphology and mineral characteristics of agglomerated bottom ash

fly ash and ash deposition on probe surfaces were studied.Moreover

the morphology and mineral characteristics of the samples were analyzed by environmental scanning electron microscopy (SEM)

energy dispersive X-ray spectroscopy (EDS)and X-ray diffraction (XRD).The results showed that

the bed material (SiO_2) was agglomerated.Except for SiO_2

the agglomerated bottom ash was mainly composed of KAl_3SiO_(11)

NaAlSi_3O_8 and other minerals containing K

Na and Si.There was serious ash deposition on the probe surface at the outlet of cyclone separator

and the ash deposition showed stratification.The outer layer was composed of loose coarse particles

and the inner layer was composed of a sintered ash cone.SEM-EDS result showed that the sulfate or aluminosilicate of Na and K promoted the sintering of ash particles

so as to form ash cone in the inner layer.