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中文摘要：
在管式电炉还原性气氛下,对煤灰进行1 300℃和1 400℃的高温热处理。同时,在小型膜式水冷壁气流床气化炉热模装置中进行煤气化实验。利用XRD、SEM和EDS等方法,考察了热处理后灰渣与煤气化所得炉渣的表面形态、内部微观结构、矿物组成等结构特性,并对管式电炉内进行灰渣热处理实验的可行性进行评估。结果表明,热处理温度和灰渣流动温度对灰渣的结构具有重大影响,热处理温度高于灰渣流动温度约10℃时,灰渣中含有大量矿物晶体且表面形态粗糙,内部微观结构凹凸不平,灰渣难于流动;热处理温度高于灰渣流动温度约100℃时,渣中大部分矿物晶体已变成无定形的玻璃体物质,灰渣表面及内部微观结构变得光滑均匀。采用管式电炉模拟气化炉内灰渣氛围,研究气化炉操作温度对灰渣结构的影响,具有一定的可行性。
英文摘要：
The surface morphology,microstructure,mineral components and structural porosity of the heat treated coal ash at 1300℃and 1400℃ under reducing atmosphere in a tube furnace and the slag from an entrained-flow gasifier with membrane water wall were investigated by using XRD,SEM and EDS.It is found that the surface morphology,microstructure and compositions of the heat treated coal ash are affected remarkably by the treatment temperature and the ash fluid temperature.When the treatment temperature is higher than the ash fluid temperature about 10℃,a lot of crystalline particles are formed in the heat treated coal ash,the surface morphology becomes coarse,and the microstructure is uneven.When the treatment temperature is over the fluid temperature about 100℃,the majority of crystalline particles in the heat treated coal ash are transformed to glassy amorphous phase that is distributed uniformly in the ash.The results indicate that in a simulated reducing atmosphere of the gasifier to investigate the effect of operation temperature on the structure of slag in a tube furnace is feasible.
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