Influence of gasification coal blending on ash fusion characteristics

In order to reduce the influence of coal ash on entrained flow gasification, and improve the efficiency of gasification, coal samples with different ash fusio n temperatures ( AFTS) were blended with different ratios. The chemical composition and content of coal ash were analyzed by X-ray Fluorescence Spectrometer ( XRF) . Mineral evolution in fusing process were investigated with the X-ray Diffrarction ( XRD) . The results show that coal blending has different effects on their AFTs. The Sh enmu coal can decrease the AFTs of Fangzheng coal and Changzhi coal significantly, while it isn't obvious for Sunjiahao coal. This difference mainly results from the lo wer ratio of Si/Al ratio of Sunjiahao coal. The coal AFTs is direct proportional with the Si ratio, and is inverse with the basic to alkali and acid ratio and the Si/Al ratio. Be sides, it is also indicated that the AFTs of coal is not only related to the chemical composition, but also to mineral interactions at low temperatures.