School of Chemistry and Chemical Engineering, He, nan Polytechnic University Department of Chemistry and
Chemical Engineering, Heze University

为了降低煤灰对气流床气化的影响,提高气流床的气化效率,将灰熔融性不同的煤按一定比例进行配比,采用X射线荧光光谱法(XRF)研究了煤灰化学组成对煤灰熔融温度的影响,利用X射线衍射仪(XRD)分析了混合煤样加热过程中矿物组成的变化。结果表明,配煤调控煤灰熔融温度的效果不同,神木煤降低方正煤与长治煤的灰熔融温度效果明显优于孙家壕煤,硅铝比较低是孙家壕煤灰熔融温度改善效果不明显的主要原因。煤的灰熔融温度与煤灰中的碱酸比和硅铝比呈负相关,与硅比呈正相关。煤的灰熔融温度不仅与煤中的化学组成有关,还与矿物质间的低温共熔作用有关。

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.