流体机械2025，Vol.53Issue(2)：33-40,101,9.DOI:10.3969/j.issn.1005-0329.2025.02.005
乙醇分割式机械蒸汽再压缩热泵精馏系统开发及性能研究
Development and performance study of ethanol external separate mechanical vapor recompression heat pump distillation system
摘要
Abstract
Conventional mechanical vapor recompression(MVR)distillation technology cannot meet the energy-saving distillation requirements for ethanol-water,while balancing the safety and economy of the distillation system,taking into account the safety and economy of the distillation system,an external working medium splitting MVR heat pump distillation system was developed.A combined NRTL-RK model using NRTL equation in liquid phase and RK equation in gas phase was constructed to fit the thermodynamic properties of the system.With the help of Aspen Plus software,four kinds of systems,namely conventional distillation,conventional MVR heat pump distillation,direct compression MVR heat pump distillation and external working medium separation MVR heat pump distillation,were simulated and analyzed.The results show that the safety of the system is improved by introducing water as circulating working medium and compressing water vapor instead of ethanol vapor.With the split structure,the temperature difference of the upper distillation column is only 3.54℃,which effectively reduces the temperature difference of the compressor inlet and outlet.The comparison between the analysis results of the NRTL-RK combination model and experimental data shows that the constructed NRTL-RK combination model can accurately fit the thermodynamic characteristics of the ethanol-water system.Compared with the conventional ethanol distillation system,the designed and developed external working fluid split MVR heat pump distillation system can save 72.15%of energy and 70.87%of operating costs.The system has been successfully applied in actual production,with significant energy-saving effects.The research results can provide reference for energy saving transformation in ethanol distillation process.关键词
乙醇/精馏系统/热泵/机械蒸汽再压缩(MVR)/热力学Key words
ethanol/distillation system/heat pump/mechanical vapor recompression(MVR)/thermodynamics引用本文复制引用
廉文韬,吴小华,杨鲁伟,侯超,宁旭丹..乙醇分割式机械蒸汽再压缩热泵精馏系统开发及性能研究[J].流体机械,2025,53(2):33-40,101,9.基金项目
中国科学院低温工程学重点实验开放课题(CRYO202112) （CRYO202112）
北京石油化工学院重要科研成果培育项目(BIPTACF-002) （BIPTACF-002）
重要科研成果培育项目(PCF-002) （PCF-002）
北京市教委科研计划(KZ202110017026) （KZ202110017026）
