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再燃烧条件下煤粉热解特性的实验研究

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Keywords: 再燃烧,煤粉和煤焦,热解,煤质量损失

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Abstract:

利用携带流反应装置,研究了煤粉在高温烟气环境中热解时的质量损失和C、H、N元素释放特性,采用扫描电镜和氮吸附方法观测了煤焦的显微结构、比表面积和总孔容积.结果表明,随着煤阶的降低,其煤焦比表面积和总孔容均升高,小龙潭褐煤增加最多,六枝贫煤增加最少;随着煤粉初始挥发分含量的增加和热解烟气温度升高,煤的质量损失增加,烟气气氛对煤粉质量损失份额影响较小;在实验条件下,煤中C、N析出份额与煤的质量损失份额基本相同,H释放份额远大于C、N和煤质量损失,达80%以上.

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