关键词: 生物质, 鲍店煤, 混合灰, 灰熔点, 黏温特性

Abstract: The fusion characteristics of blending ash of Baodian coal and rice straw, corn straw, cotton straw at different blending ratios（10%—90%, step 10%)were investigated respectively using X-ray fluorescence（XRF)spectrometer, X-ray diffractometer（XRD), and ash fusion point analyzer in reducing atmosphere.The characteristics of viscosity-temperature of blending ash at 10% blending ratio were also studied by high-temperature viscometer.The computer software package FactSage was used to predict the proportions of solid, the composition of the remaining liquid phase and the variation of phase.The results showed that the addition of 3 kinds of crop straw reduced the ash fusion temperature of Baodian coal at the blending ratio of 10%—30%.The fluctuation could be seen at the range of 40%—90%, but the fusion temperatures of blending ash were less than Baodian coal ash.The viscosity-temperature characteristic of Baodian coal ash was improved by the addition of crop straw, and the lowest operating temperature of gasifier can be reduced by 20℃.Due to the emergence of anorthite, the viscosity increased with decreasing the temperature of melting ash.

Key words: biomass, Baodian coal, blending ash, ash fusion temperature, viscosity-temperature characteristic