Journal
APPLIED THERMAL ENGINEERING
Volume 154, Issue -, Pages 519-529Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.03.118
Keywords
Pressure-swing distillation; Heat pump; Total annual cost; The temperature-enthalpy diagram; Payback period
Funding
- National Natural Science Foundation of China [21676152, 21776145]
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Pressure-swing distillation was investigated to separate ethanol/acetonitrile binary azeotrope. The parameters were optimized based on the minimum total annual cost. To implement cost saving, heat pump technology was applied to pressure-swing distillation process and two new pressure-swing distillation processes were explored and studied. The heat-pump-assisted pressure-swing distillation, which only needs a small amount of fresh heat steam, saves 62.8% of the operating cost compared with the pressure-swing distillation. The other process called double-heat-pump-assisted pressure-swing distillation, which needs no fresh heat steam, achieves an operating cost saving by 59.9%. To further analysis of thermodynamic efficiency, the temperature-enthalpy (T-H) diagram and stage-exergy and stage-deficit were studied. Payback period was introduced to evaluate the economy of the processes. The results showed that the payback periods of the new pressure-swing distillation processes are shorter than the suggested 15-year payback period by at least 7.5 years. Both the processes perform well on operating cost saving and they were economical for separating the ethanol/acetonitrile binary azeotrope.
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