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油页岩化学结构的化学渗透脱挥发分模型

DOI: 10.13334/j.0258-8013.pcsee.2014.20.007, PP. 3295-3301

Keywords: 油页岩,核磁共振,热解,化学结构,化学渗透脱挥发分

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Abstract:

采用核磁共振碳谱(nuclearmagneticresonancespectra,13C-NMR)以及综合热分析仪和傅里叶红外联用技术(thermogravimetric-Fouriertransforminfraredspectroscopy,TG-FTIR)等手段,通过热解实验研究油页岩化学结构特性,建立适用于油页岩化学结构的化学渗透脱挥发分(chemicalpercolationfordevolatilization,CPD)模型。该文通过13C-NMR对油页岩化学结构进行研究,得到CPD模型的4个输入参数。核磁共振分析表明,区别于煤的化学结构,芳碳含量在油页岩化学结构中所占比例相对较低,窑街样品中芳碳含量为50%,而在兴安盟样品中的含量仅为35%。利用TG-FTIR等手段通过C-R法求得桥键断裂的动力学参数,以窑街和兴安盟油页岩为样品,预测其在加热速率为50℃/min条件下的挥发分曲线。通过后验差法检验模型的预测误差,结果表明预测精度较高,验证了模型预测的合理性。

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