This work uses PSE methods for screening, simulation, integration, and analysis of low-carbon fuels in maritime along with options for CCS on board. The efficiencies of conventional fuels (HFO, diesel) were addressed in front of alternative fuels (methanol, LNG, H2, biocrude) to investigate energy and fuels savings considering the potentials of process and energy integration and cogeneration that uses available heat from flue gases and the engine in new engine designs of ROPAX ships. The accounted energy demands include shaft work, electricity and heat respectively used for propulsion, the engine room, and the hotel. Alternative fuels could improve economic performance of shipping by 10% (LNG)-340% (Methanol). Energy integration of the ship's hot/cold streams could reduce fuels costs by up to 10%, while CCS on board could yield CO2 emissions reduction in the range of 40% (cryogenic)-80% (MEA adsorption).
