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基于无模式法推断木醋调质石灰石热解动力学参数

, PP. 31-36

Keywords: 木醋液,调质,热解,有机钙,无模式法,活化能

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Abstract:

采用木醋废液调质石灰石,并在热重分析(thermogravimetricanalysis,TGA)仪上对调质产物的热解特性进行研究。X射线衍射结果表明,木醋调质石灰石的主要成分为水合醋酸钙,其热解过程大致分为3个阶段。扫描电子显微镜及N2吸附分析结果表明,木醋调质石灰石热解产物具有较石灰石更为疏松多孔的孔隙结构。选定3个升温速率(5,20,40K/min),采用Flynn-Wall-Ozawa法与Starink法2种无模式法计算热解反应活化能,2种方法计算结果极为接近,且规律性相同,活化能数值表现出先增大后减小、再增大的趋势,进一步证明了木醋调质石灰石热解的复杂性与多阶段性。

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