中温煤焦油加氢裂化集总动力学研究

Study on Kinetics of Medium Temperature Coal Tar Hydrocracking

以集总动力学为建模思想,将中温煤焦油裂化反应网络按原料油四组分和产品油馏分为划分标准,归并为6个虚拟集总组分,考察了氢分压、液体体积空速、床层温度对中温煤焦油加氢裂化结果的影响,建立了中温煤焦油6集总加氢裂化动力学模型。在Visual C++平台上,采用四阶变步长的Runge-Kutta法求解微分方程,采用变尺度法(B-F-G-S)获得函数最优化求解,并进行模型验证。结果表明,该模型预测相对误差小于3%,对中温煤焦油加氢裂化的产品分布具有良好的预测性,为煤焦油加氢工艺的进一步优化提供了依据。

A new six-lump kinetic model was proposed according to four-component raw oil and the cut fraction of product oil to describe coal tar hydrocracking. The effects of hydrogen partial pressure, the LHSV（Liquid hour space velocity） and bed temperature on the medium temperature coal tar hydrocracking were investigated. The differential equations were solved with the fourth order variable step Runge-Kutta and optimized with variable metric method （BFGS） in Visual C＋＋. The model was also validated. The relative error of the model was within 3%, showing a good predictability.