Abstract
International maritime shipping contributed nearly 3 % of global CO2eq emissions in 2018. The IMO has set an ambition to reach net zero CO2 emissions from maritime activities by 2050 with checkpoints of 40 % reduction by 2030 and 70 % by 2040 compared to 2008 baseline levels. In addition to alternative fuels (LNG, biofuel, methanol, hydrogen, ammonia) and efficiency-based technologies, mobile carbon capture (MCC, called also ship-borne/based carbon capture SBCC) could become a plausible technology to help meet these decarbonization aspirations. In this work, we performed a simulation to compare the use of methyl-ethanolamine (MEA) and methyl-di-ethanolamine/piperazine (MDEA/PZ) aqueous mixtures for chemical temperature swing separation of CO2 on-board a ship. We studied the main MCC system integration and design parameters and demonstrated that MDEA/PZ could represent a more efficient and cheaper path than MEA due to the heat availability limitations from the exhaust stream of the ship. Specifically, MDEA/PZ could enable 10 % savings in heat demand at the reboiler compared to MEA (3.3 vs 3.7 GJ/tCO2). Additionally, we showed that an MDEA/PZ amine-based CO2 capture and storage unit on-board the ship could lead to as low as 191$/ton CO2 avoided compared to 281$/ton of CO2 when using MEA
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