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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(T_(in))及快速熔融温度(T_(max))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T_(in)和T_(max)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、铁铝榴石以及铁做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 further study the inherent influence of the melting behavior of coal in the process of coal combustion and coal gasification on the phase transition of coal ash physical and chemical properties, this paper uses high temperature thermal microscopy and SEM-EDX analysis and testing methods to experimentally study the influence of different conditions Internal Combustion and Influence Laws of Mineral Evolution Law and Coal Phase Physical Transformation and Change Behavior Under Coal Combustion and Coal Gasification. The results show that the initial melting temperature (T_ (in)) and the rapid melting temperature (T max) of coal ash A with high iron content are lower than the corresponding temperatures under combustion conditions by 144 ℃ and 113 ℃, while the low iron content of coal ash B corresponding to the gasification conditions T_ (in) and T_ (max) lower than the corresponding temperature under the combustion conditions 25 ℃ and 62 ℃; different atmosphere under the different Fe The valence state is the main reason leading to this difference. The phase transition of coal ash occurs at high temperature. In the process of development, the iron minerals, such as calcite, almandine and iron, are the main minerals that initiate the initial melting of coal ash .