EN Thermodynamic analysis of the ethylene reliquefaction system on LEG carriers when replacing throttle devices with ejectors

LEG carriers’ energy efficiency can be increased by improving the boil-off gas (BOG) reliquefaction installation processes in its components. In this study, it is proposed to replace conventional process (CRP) of a carrier “ANTIKITIRA” actual equipped throttle devices with an ejector (ERP) having two-phase ejectors as expansion increase installation. Expansion EV2E and EV2R were replaced system. The efficiencies are ensured additional components (separators precooler bottoming stage cascade). Separators maintain constant pressure at compressor inlets, reduces load on condenser-evaporator. An model has been developed analyze design nozzle outlet determined based multivariate calculations. Energy exergy analyses ERP CRP systems carried out. According analysis results, each component's influence estimated. losses component lower than corresponding values condenser system total power consumption same both cycles, cooling capacity cycle 29.1 kW. Replacement led decrease absolute loss from 9.75 4.95 24%, 16%. most significant cycles observed during compression two-stage cargo cascade (29.0-34.1%). It concluded that meets IMO requirements for vessel but requires capital investments