Full
Outline
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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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