粒度对煤灰熔融特性的影响及作用机理初探

利用计算机控制扫描电镜(CCSEM)和5E-AFⅡ型智能灰熔点测试仪分别研究了A和B两种典型煤样的矿物组成及粒径分布和煤灰熔融温度。结果表明,煤灰熔融温度随粒径增大呈直线上升的趋势,当粒径大于100μm时,煤灰流动温度大于1 450℃。A、B煤中高岭石、石英、硅铝酸钾、蒙脱石矿物均以中小颗粒的形式存在,方解石分别以小颗粒、粗大颗粒的形式存在,铁氧化物则反之,且内在、外在矿物颗粒分布存在非均一性,这些是导致煤灰熔融特性产生重大变化的根本原因。

Study on effect of coal granularity on fusibility of coal ash and the mechanism

Computer controlled scanning electron microscopy(CCSEM),many elements fast analyzer and the 5E-AFⅡ intelligent ash fusion detector were applied to study the mineral composition and particles,coal ash components and ash fusion temperature of A and B coal.The results showed that coal ash fusion temperature trended to rise with the coal diameters increasing,when the particle size was greater than 100 μm,the coal ash fusion temperature was over 1 450 ℃.Kaolinite,quartz,potassium aluminosilicate,montmorillonite existed in the form of medium sized particles.Calcite existed with small particles in A coal,which existed with crassitude particles in B coal,while iron oxide present on the contrary.Also,the heterogeneous nature existing in coal inner mineral and external mineral,that is the basic and most important reason of the difference of coal ash fusibility.