The 34th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures Conference, TEAM 2020/21, İstanbul, Turkey, 6 - 08 December 2021, pp.320-328
Reducing CO2 emissions to mitigate global warming has become more important over time. The International Maritime Organization (IMO) has adopted rules and regulations to limit the greenhouse gas emissions arising from international maritime activities, and it is expected that these rules will become more restrictive in the future. The carbon capture and storage (CCS) systems are effective methods in controlling CO2 emissions, and studies of using CCS systems on ships have recently increased its popularity. This study investigates the effects of different solvents as 30% aqueous diethanolamine (DEA), methyl diethanolamine (MDEA), monoethanolamine (MEA), and piperazine (PZ) on the effectiveness of the solvent-based CCS systems and performs detailed cost analyses of CCS systems for different types and sizes of ships. The main power and waste heat recovery (WHR) systems of studied ships and proposed CCS systems are simulated as a thermodynamic model with Aspen HYSYS. Three different sizes of liquefied natural gas (LNG) carriers (Q-Max, Q-Flex, and conventional LNG carriers) are considered. The obtained results are compared with the speed reduction method in the literature in terms of their CO2 emission reduction costs. The results show that using different solvents reduces heat requirements by at least 9.6%, the height of the absorber column by at least 24.5%, the cost of the CCS system by at least 14.4%, and enhance the carbon capture effectiveness compared with conventional solvents. CCS systems will become more feasible for ships in controlling CO2 emissions when advanced task-specified solvents are developed in the future.