OPTIMIZATION OF ENERGY-SAVING DISTILLATION SYSTEM BASED ON INTERMEDIATE HEAT EXCHANGER-ABSORPTION HEAT PUMP

Abstract

Abstract: In order to improve the energy efficiency of distillation, an energy-saving distillation system with an intermediate heat exchange and an absorption heat pump was proposed. The mathematical model of 180 kt/a gas distillation column in a petrochemical enterprise was established by using Aspen Plus software. The operating parameters of the intermediate reboiler, the intermediate-condenser and the absorption heat pump in the energy-saving system of the intermediate heat exchange-absorption heat pump distillation were optimized, and the energy-saving effect of the “three-column” distillation process was analyzed. The results show that the steam consumption of the depropane column can be decreased by 25% by using the intermediate heat exchange-absorption heat pump distillation energy saving system, the steam consumption can be reduced by 38.8%, and the softened water consumption can be saved by 42.5% for the complete three-column gas fractionation process. The additional profit is about 5 308 000 Yuan/a, and the fixed investment payback period of the project is about 3 years.

Key words: distillation, intermediate heat exchange, absorption heat pump, cascade energy utilization, energy saving

References

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