基于ASPEN PLUS的超临界汽油中低温煤焦油加氢裂解工艺模拟(英文)

Modeling of low temperature coal tar hydrocracking in supercritical gasoline using ASPEN PLUS simulator

为了尽快实现超临界汽油中低温煤焦油加氢裂解工艺的工业化,利用ASPEN PLUS模拟煤焦油在超临界溶剂中的加氢过程,以获得整个工艺运行的基本参数。本文基于超临界汽油中低温煤焦油加氢裂解的中试试验数据,对超临界汽油中低温煤焦油加氢裂解工艺进行模拟。首先,煤焦油代表组份选自煤焦油中含量较高的组分,汽油溶剂在模拟中根据其沸点曲线定义为虚拟组分;其次,根据碳离子反应机理,所有的煤焦油代表组分发生裂解反应,并将所有反应输入模型;加氢裂解过程主要选用RK-SOAVE和BK10物性方法,超临界汽油在模拟过程中定义为亨利组分:最后,根据煤焦油加氢裂解的反应特征,模型中主要包含3个基本模块,即RYIELD、Separtor和PetroFrac,分别模拟加氢裂解、气液分离和常压分馏。模拟时将超临界汽油中低温煤焦油加氢裂解中试实验条件数据输入模型,模拟结果表明:模型预测值与实验值基本一致,表明该模型能较好的反映超临界汽油中低温煤焦油加氢裂解工艺过程。并利用模型对年处理15万吨的超临界汽油中煤焦油加氢裂解工艺进行优化设计,获得了工艺的基本参数和能耗,为超临界汽油中低温煤焦油加氢裂解工艺工业化提供了理论依据和设计参考。

In order to realize the pilot test of low temperature coal tar hydrocracking process in supercritical gasoline, hydrocracking process should be simulated to obtain the fundamental information of the whole process using the ASPEN PLUS simulator. Based on the bench test of low temperature coal tar hydrocracking process in supercritical gasoline, the modeling of the low temperature coal tar hydrocracking process was developed. Firstly, some model components with higher contents were selected to express the coal tar, and gasoline solvent was defined as a pseudo component for the modeling input according to its true boiling point curve; Secondly, all the modeling components were cracked in the simulation on the basis of carbenium ions reaction mechanism, the reactions were input into software; then the RK-SOAVE and BK10 property methods were used in the modeling of hydrocracking process, and supercritical gasoline was defined as HENRY component in the present simulation; at last, according to the features of coal tar hydrocracking process, the ASPEN PLUS model consisted of three basic unit operation blocks, including RYIELD, Separator and PetroFrac, which model the hydrocracking process, gas and liquid separation and atmospheric distillation, respectively. The model was established, in order to validate the ASPEN PLUS modeling, the bench test operating conditions of low temperature coal tar hydrocracking in supercritical gasoline were used in the simulation, which had been reported in our previous study. The results shows the basic agreement between predicted results and experimental data, which means the feasibility of the ASPEN PLUS simulation of low temperature coal tar hydrocracking process. The pilot test of the hydrocracking process with an annual coal tar input of 150 thousand tons was simulated to obtain the system operation parameters and apparatus parameters, which provides a theoretical basis and design reference for the industrialization of low temperature coal tar hydrocracking process in supercritical gasoline.