Abstract: Aiming at the problem of excessive energy consumption in the thermal regeneration system of a rectisol process in a certain petrochemical engineering company, process improvement is carried out. A closed thermal pump distillation model was proposed using the NRTL thermodynamic model, with annual total cost and thermodynamic efficiency as the objective functions. The economic and energy-saving effects under different compression ratios were analyzed. Compared with conventional distillation, the total energy consumption was reduced by 62.71% when the compression ratio was 1.8; the annual total cost was reduced by 15.64% when the payback period was 5 years; the annual total cost was reduced by 32.79% when the payback period was 8 years; the thermodynamic efficiency was improved from the original 8.78% to 20.96%, which has excellent economic and energy-saving benefits, and the results of the study are expected to provide guidance for the development and design of advanced heat pump distillation technology.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">closed heat pump distillation, rectisol, thermal regeneration system, energy consumption, compression ratio, annual total cost, thermodynamic efficiency

摘要： 某石化工程公司低温甲醇洗工艺热再生气系统能耗过大，针对该问题进行了工艺改进。采用NRTL热力学模型，以年总费用和热力学效率为目标函数，提出了闭式热泵精馏模型。在不同压缩比的条件下，对其经济性和节能效果进行了分析。与常规精馏相比，采用闭式热泵精馏流程，在压缩比为1.8时，总能耗降低了62.71%；在投资回收期为5a时，年总费用降低了15.64%；在投资回收期为8a时，年总费用降低了32.79%；热力学效率从8.78%提高到20.96%，具有极佳的经济性和节能效果。该研究可为先进热泵精馏技术的开 发设计提供指导。

关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">闭式热泵精馏, 低温甲醇洗, 热再生气系统, 能耗, 压缩比, 年总费用, 热力学效率