Thermodynamic Analysis of an Ethylene Reliquefaction System Using the Entropy-Cycle Method

In this study, a boil-off gas reliquefaction system that is part of liquid ethylene (LEG) carriers evaluated. The formed by two thermally interconnected two-stage refrigeration cycles. working fluid the bottoming cycle ethylene; topping propylene. research based on determining irreversibilities in cycles using entropy-cycle method thermodynamic analysis. impact process performance main components energy efficiency has been evaluated method. greatest irreversibility observed compression (9%), total throttling (8.5%), and vapor superheating at suction into low stage compressor (8%). results study showed it necessary to improve design expansion devices replacement throttle with ejectors when designing cascade plants. addition, operating such systems much attention should be paid condition insulation cargo pipelines parameters cooling compressor.