Techno-economic and environmental evaluation of onboard carbon capture and storage system through heat integration and solvent selection

Onboard carbon capture and storage (OCCS) systems have garnered attention as attractive solutions to reduce greenhouse gas (GHG) emissions from marine sector. However, the high energy demands for solvent regeneration remain a major challenge. To address this issue, this study proposes an OCCS system that utilizes compression heat recovery from a CO 2 liquefaction system in combination with amino methyl propanol-piperazine (AMP-PZ) and a heat pump. The proposed system decreased additional heat demand by 45.2% in diesel mode and 73.7% in liquefied natural gas (LNG) mode, compared to combination with Monoethanolamine (MEA) and boiler. Although LNG mode results in lower CO 2 emissions owing to its lower carbon content, its well-to-wake (WtW) GHG intensity is higher than that of the diesel mode owing to methane slip (2.1 gCH 4 /kWh) from LNG combustion in the main engine. Consequently, the pr…