Simulation of onboard carbon capture and storage system for LNG fuel ships under EEDI framework
With the accelerated implementation of Energy Efficiency Design Index (EEDI)phase 3 by the International Maritime Organization,shipping carbon reduction is urgently required.This paper proposes an onboard carbon capture and storage (OCCS)system under the EEDI framework.The OCCS system design principle for an LNG-fueled bulk carrier is determined with the constraints between EEDI phases 3 and 4.The OCCS is par-ticularly established with the utilization of exhaust gas waste heat and LNG cold energy.The proposed OCCS system is modelled in Aspen HYSYS,laying the foundation for energy,exergy and economic analysis.The results show that the CO2 captured by ref-erence bulk carrier under the EEDI framework is between 613.8 kg/h and 1114.3 kg/h,and the requirement of EEDI phase 4 can even be met by adjusting the exhaust gas mass flow rate and liquid-gas ratio (L/G).In addition,when L/G is 1 .1,the system can have better energy,exergy and economic performance.This study provides an important basis for the maritime post-combustion carbon reduction compliance.
onboard carbon capture and storageenergy efficiency design indexship waste heat recoveryLNG cold energy recovery
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