摘要
为探索小龙潭褐煤气化灰熔聚物及结渣的熔融特性,采用化学分析法和X-射线衍射法从煤灰成分和矿物质组成的角度分析了气化炉结渣、灰熔聚物和矸石灰熔融性差异的原因.结果表明,炉内结渣的灰熔点最低,灰熔聚物居中,矸石灰最高.灰分中总碱性组分含量由结渣、灰熔聚物到矸石灰依次减少,导致三种物质的灰熔点依次增加.钙黄长石和钙长石等含钙化合物间形成低熔点共融物是结渣灰熔点低的原因;矸石灰中石英石的含量明显高于灰熔聚物,与矸石灰中莫来石的"骨架"作用导致矸石灰的灰熔点比灰熔聚物高.三种物质灰熔融性差异是由于流化床气化过程中矿物质的迁徙转化引起的.
In order to understand the fusion characteristics of the agglomerates from the fluidized-bed gasification, the experiment was conducted to investigate the differences of ash fu- sion temperatures （AFTs） of the slag in the gasifier, spherical agglomerates and coal gangue ashes. It was analyzed from the aspects of coal ash ingredients and mineral crystal phase composi- tion by chemical analysis and X-ray diffraction method （XRD）. The results show that the AFTs of three ash residues are elevated from slag, spherical agglomerates to coal gangue ashes. The changes of ash compositions contribute to the variations of AFT, the decreasing of the total basic composition in three ash residues make AFTs increase, and vice versa. Low temperature molten matrix formed by gehlenite, anorthite and other calcium compounds make the AFTs of slag lower than the other two; the content of quartz in coal gangue ashes is higher that of spherical agglomerates and the skeleton role of mullite lead to the AFT of coal gangue ashes is higher than that of spherical agglomerates. The fusion characteristics differences of three ash residues are mainly caused by the migration and conversion during the process of Xiaolongtan lignite fluidized-bed gasification.
出处
《煤炭转化》
CAS
CSCD
北大核心
2011年第2期36-40,共5页
Coal Conversion
基金
国家高技术研究发展计划(863)项目(2008AA050302)
中国科学院知识创新项目(KGCX2-YW-320)
关键词
小龙潭褐煤
流化床气化
灰熔聚物
熔融特性
Xiaolongtan lignite, fluidized bed gasification, agglomerates, fusion characteristics
