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比表面积和灰分对烟煤半焦气化机理的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.20.015, PP. 5244-5250

Keywords: 煤半焦气化,气化动力学,比表面积,灰分

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Abstract:

Langmuir-Hinshelwood(L-H)动力学模型在描述H2O与CO2混合气氛下的煤焦气化时,存在公共活性位与单独活性位2种矛盾的反应机理假设。为解释这一矛盾现象,提出了比表面积和灰分2种可能的因素。实验在改造后的热重分析仪上进行,实验系统压力为常压,反应温度为1223K。实验结果表明,比表面积和灰分均会对煤焦气化机理产生影响。比表面积较大的煤焦,其实验结果更符合基于单独活性位假设的L-H模型预测值,而比表面积较小的煤焦,其实验结果与基于公共活性位假设的L-H模型预测值相吻合。脱灰后的煤焦,其实验结果与基于2种假设的L-H模型预测值均不吻合。

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