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OALib Journal期刊
ISSN: 2333-9721
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升温速率对神木煤热解半焦结构性能的影响
, PP. 798-805
Keywords: 热解,升温速率,微晶结构,表面化学,煤焦气化活性,神木煤
Abstract:
？利用管式炉和微波材料工作站分别对神木煤煤样进行终温为750℃的慢速(3和5℃/min)、中速(10和15℃/min)及快速(50、100、225、350和750℃/min)热解,基于热解半焦x射线衍射谱图解析热解半焦的微晶结构参数,采用傅里叶变换红外光谱表征热解半焦的表面化学,并借助热重分析仪、选用气化活性参数rt评价热解半焦的气化反应活性。结果表明,随着升温速率的增大,神木煤热解半焦总体上呈现的趋势是:表面含氧官能团含量降低,半焦的微晶层片尺寸la和石墨化度明显提高,层间距d002和堆积高度lc略微减小,说明神木煤半焦结构随升温速率的提高变得规整;随着升温速率的增大,半焦的气化活性rt从0.1782降低至0.1036。热解终温为750℃的神木煤热解过程中,快速热解有利于获得易石墨化、表面非极性化、气化反应性低的产物。
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