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基于综合热分析仪和傅里叶红外联用技术(TGFTIR),通过引入轻质气体组分官能团模型,改进油页岩化学结构的化学渗透脱挥发分(CPD)模型,实现其对油页岩热解中轻质气体组分析出过程的精确预测。通过TG-FTIR对甘肃窑街油页岩的热解特性进行研究,利用非线性最小二乘法求解轻质气体各组分的动力学参数,预测出其在加热速率为20℃/min的条件下的轻质气体各组分的析出过程。用CPD模型与改进后CPD模型模拟出20℃/min窑街油页岩的热解过程,对比其实际热解过程分析模型的可行性与合理性,再用后验差检验法分析结果的误差。结果表明:油页岩的脱挥发分过程主要分为3个阶段,300-600℃为主要热解阶段,3个阶段的失重率约为5%、16%、6%;各轻质气体析出的活化能E分布在188~249k J/mol之间,而指前因子A在109~1013s-1之间;改进后CPD模型的预测值与实验值相对误差较小,契合度较高,说明改进后CPD模型能够较精确对油页岩热解过程进行预测与模拟。
Based on the integrated thermal analyzer and the Fourier transform infrared spectroscopy (FTIR), the chemical permeation devolatilization (CPD) model of chemical structure of oil shale was improved by introducing the functional group model of light gas component, Precise Prediction of the Process of Light Gas Components in Pyrolysis. The TG-FTIR was used to study the pyrolysis characteristics of oil shale in Kaohsiung Street in Gansu. The kinetic parameters of each component of light gas were calculated by using the nonlinear least-squares method. It was predicted that the heating rate of 20 ℃ / min Of the light gas components of the precipitation process. The CPD model and the improved CPD model were used to simulate the pyrolysis process of the oil shale at kiln street at 20 ℃ / min. The feasibility and rationality of the analysis model were compared with the actual pyrolysis process. Then the error of the results was analyzed by using the posterior difference test . The results show that the devolatilization process of oil shale can be divided into three stages, 300-600 ℃ is the main pyrolysis stage, and the weight loss rate of the three stages is about 5%, 16% and 6% The activation energy E is distributed between 188 ~ 249k J / mol, while the pre-exponential factor A is between 109 ~ 1013s-1. The relative error between the predicted value and the experimental value of the improved CPD model is small and the fit degree is high The improved CPD model can predict and simulate the oil shale pyrolysis process more accurately.