悬浮床低温煤焦油加氢集总动力学模型研究

Lumping kinetics of low temperature coal tar hydrogenation in suspended-bed

为了探究不同催化剂配比和添加量对悬浮床低温煤焦油加氢活性的影响,建立准确的加氢动力学模型。文中针对低温煤焦油的性质选择油溶性的Mo-Ni催化剂,根据不同反应条件对产品分布的影响规律,构建反应网络,建立五集总动力学模型。采用煤焦油密度、氢碳比、反应温度、反应压力及反应时间作为输入,将五集总的收率作为输出,验证集总动力学模型预测的精确度。结果表明:各集总的计算值与试验值较为接近,最大相对误差为16.49%,满足实际需求。研究结果可为悬浮床煤焦油加氢精制工艺的发展提供一定的理论基础。

In order to investigate the influence of different catalyst ratio and addition amount on the hydrogenation activity of coal tar,an accurate hydrogenation kinetics model was established.Based on the properties of the low-temperature coal tar,the oil-soluble molybdenum naphthenate and nickel naphthenate catalysts were selected for hydrocracking.According to the influence of different reaction conditions on product distribution,a five-lumping kinetic model was established.The influence of different operating conditions(i.e.,coal tar density,hydrogen to carbon ratio,reaction temperature,reaction pressure and reaction time)on model parameters was studied through hydrocracking experiments.The results show that the maximum relative error of the model is 16.49%,and the error is small enough to meet the actual demand.The research contents can provide a theoretical basis for development of suspended-bed hydrocracking process.