分壁精馏塔分离加氢裂化喷气燃料的设计与优化

Design and Optimization of Dividing Wall Column for Separating Hydrocracking Jet Fuel

分壁精馏塔(DWC)是一种典型的化工过程强化设备,具有节能和节约设备投资的优势,但在石油化工领域应用较少。基于加氢裂化喷气燃料实沸点蒸馏结果,以之分馏制备不同牌号轻质白油过程为研究对象,在传统分馏工艺(FP)的基础上提出了单隔壁分馏工艺(DWC-FP)和双隔壁分馏工艺(DPDWC-FP),并建立FP、DWC-FP和DPDWC-FP的严格稳态精馏模型;以年总成本(TAC)和再沸器负荷为目标函数,通过非支配排序遗传算法NSGA-Ⅱ优化工艺流程。结果表明,DWC在应用于石油馏分的分离过程中具有节能优势,DPDWC-FP工艺可在1个塔内实现4个产品的分离;与FP相比,DWC-FP和DPDWC-FP的TAC分别减少19.61%和24.09%。

Dividing wall column(DWC)is a typical intensified equipment for chemical processes,and has significant advantages in energy conservation and reduction of equipment investment.However,it is rarely used in the field of refinery industry.Based on the real boiling point distillation results of hydrocracking jet fuel,the study targets at the process of preparing different grades of light white oil by fractional distillation.On the basis of the conventional fractionation process(FP),A dividing wall column fractionation process(DWC-FP)and a double partition dividing wall column fractionation process(DPDWC-FP)are proposed.Rigorous steady-state distillation models have been established for FP,DWC-FP,and DPDWC-FP,respectively.Then,the above processes were optimized by the non-dominated sorting genetic algorithm NSGA-Ⅱwhen using the total annual cost(TAC)and reboiler load as the objective functions.Results indicate that DWC possesses energy-saving advantages when applied to the separation of petroleum fractions,and the DPDWC-FP process can achieve the separation of four products in a single column.Compared with FP,the TAC of DWC-FP and DPDWC-FP was reduced by 19.61%and 24.09%,respectively.