为深入研究煤燃烧与煤气化过程中煤中矿物的熔融变化行为对煤灰物理相变变化过程的内在影响规律，本文采用高温热显微镜、SEM—EDX等分析测试手段，实验研究了不同条件（煤燃烧与煤气化）下煤中矿物演变规律与煤灰物理相变变化行为间的内在联系和影响规律。研究结果表明：高铁含量的煤灰A在气化条件下发生初始熔融温度（Tin）及快速熔融温度（Tmax）要比其在燃烧条件下对应的温度分别低144℃和113℃，而低铁含量的煤灰B则对应气化条件下的丑。和Tmax分别比燃烧条件下的对应温度低25℃和62℃；不同气氛下灰中Fe的不同价态是导致这种差别的主要原因，高温下煤灰相变发生、发展过程中，灰中方铁石、铁铝榴石以及铁橄榄石等铁系矿物是引发煤灰发生初始熔融的主要矿物。
In order to get more clearly information on the inherent relations between mineral transition and coal ash melting behavior. The internal relationship between mineral transition and coal ash melting behavior was studied by heating microscopy, Scanning Electron Microscope （SEM） combined with EDX （SEM-EDX）. The results showed that the Tin and Tmax of ash A, which contains more iron-bearing minerals, under reducing condition occurs much earlier （144 and 113~C, respectively） than that of under air condition, whereas, the Tin and Tmax of ash B under reducing condition occurs relatively a little earlier （25 and 62℃, respectively） than that of under air condition. The different states of iron （Fe^2＋ or Fe^3＋） are the dominant reasons for different sintering behaviors and cause the different sintering degrees under different conditions at the same temperature. In the coal ash melting process, wustite, almandite and fayalite act as the key factors influencing the initial sintering behavior.
参考文献
| [1] | 许世森.IGCC与未来煤电[J].中国电力,2005(02):13-17. |
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