Seven typical biomass species in northeast China are selected as the research objects

through X-ray diffraction(XRD) spectrum analysis

X-ray fluorescence(XRF) spectrum analysis

scanning electron microscopy(SEM) topography analysis and X-ray energy spectrum analysis(EDS)

combined with the measurement results of the ash melting temperature of biomass ash

the area shrinkage rate curve of biomass ash cone

and the ternary composed of alkali metal oxides(K_2O

Na_2O)

alkaline earth metal oxides(MgO

CaO) and Al_2O_3

SiO_2 system

as well as the fouling characteristics and slagging tendency of 7 typical biomass ash

were studied. Moreover

a new index J for predicting biomass ash slagging was proposed for the softening temperature. The results show that: when J1

the biomass ash has a serious slagging tendency; when 1≤J2

the biomass ash has a moderate slagging risk;when J≥2

the biomass ash has a low slagging risk. This conclusion provides a new reference index for reducing the slagging of biomass boilers or biomass coal-fired coupled power generation boilers.