摘要: 循环流化床煤气化细粉灰残炭含量较高，对其进行资源化再利用能有效提高碳转化率。实验以一种气化细粉灰( 来自循环流化床气化炉) 为研究对象，利用 X 射线衍射( XＲD) 仪和扫描电子显微镜( SEM) 、灰熔融仪，从矿物质转化以及灰渣微观结构 2 个方面，研究在高温还原性氛围下，氧化亚铁对灰熔融性的影响。结果表明，莫来石的存在导致气化细粉灰熔融温度升高; 加入氧化亚铁后，钙长石和铁尖晶石等较低熔融温度的矿物质的生成，以及低温共熔现象的发生是灰熔融温度降低的主要原因。扫描电镜下拍摄的灰渣的微观结构验证了 XＲD 的分析结果。

关键词: 循环流化床煤气化；气化细粉灰；灰熔融性；氧化亚铁

Abstract: Fine ash of coal gasification from a circulating fluidized bed has high residual carbon content，and its reuse can effectively increase the efficiency of carbon conversion．So it is necessary to study the characteristics of the gasified fine ash．Ash fusion determinator，X-ray diffractometer，scanning electron microscope were used to study the influence of ferrous elements on the ash fusibility of gasified fine ash from the perspectives of mineral transformation and microstructure at high temperature under the reducing atmosphere．Mullite leads to a higher ash fusibility temperatures．The formation of lower melting temperature minerals，such as anorthite and hercynite and the occurrence of low temperature eutectic phenomenon，are the main reasons for the decrease of ash melting temperature after the addition of FeO．The microscopic results of ash under the scanning electron microscopy verify the diffraction results of XＲD．

Keywords: circulating fluidized bed gasification; gasified fine ash; ash fusibility; ferrous oxide