针对气体分馏装置五塔分离工艺高能耗特点，在Aspen Plus软件模拟结果的基础上，分别采用易分离系数（CES）法和相对费用函数法各自筛选出最佳分离序列，再根据调优法的规划序列原则筛选出气体分馏工艺的最优分离序列。以筛选出的最优分离序列为研究对象，把多效精馏、MVR热泵精馏以及热集成等节能技术应用于气体分馏系统，提出了各种节能分馏工艺。选用软件中的RK-Soave物性计算方法，以能耗和年总费用（TAC）为评价指标，对以上提出的各种节能技术方案进行模拟与优化。研究结果表明，对于五塔气体分馏装置，最为节能的分馏工艺是：T202和T204分别采用MVR热泵精馏技术，T201塔底与T205塔顶构成MVR热耦合。与常规精馏工艺（分离序列2）相比，优化后的分馏系统能耗减少了75.9%，TAC节省了57.15%。

In the light of high energy consumption characteristics for the five-column separation process in gas fractionation unit,the optimum separation sequences for the gas fractionation process are screened respectively by the coefficient of easy separation (CES) and the relative cost function method based on the simulation results by Aspen Plus software.Then,the optimum separation sequence is selected according to the planning sequence principle of the optimization method.With the obtained optimum separation sequence as study object,the energy-saving technologies such as multi-effect distillation,MVR heat pump distillation and thermal integration are applied to the gas fractionation process and various energy-saving fractionating processes are proposed.With the energy consumption and total annual cost (TAC) as the objective functions,the RK-Soave physical property calculation method in the software is used to simulate and optimize the energy-saving fractionation processes proposed.The results show that the most energy-efficient distillation process scheme for the five-column gas fractionation unit is gained as follows:MVR heat pump distillation technology is adopted for T202 and T204 both and MVR thermal coupling is formed between T201 tower bottom and T205 tower top.The optimized fractionation system can reduce energy consumption by 75.9% and TAC by 57.15% than the conventional distillation process (separation sequence 2).

杨德明(1966-),男,硕士,教授,研究方向为分离工程与计算机模拟