Process design and energy assessment of an onboard carbon capture system with boilers or heat pumps for additional steam generation

ABSTRACTThis study proposes a novel onboard carbon capture system (OCCS) with reduced fuel consumption. The proposed system included a heat pump with an intermediate heat exchanger, a parallel compressor, and a steam compressor. The proposed system consumed 43% less fuel than the boiler for producing the same amount of steam, which was required for CO2 stripping. In addition, a blended solvent of amino methyl propanol (AMP) and piperazine (PZ) was applied to the OCCS. A rate-based process simulation indicated that this solvent resulted in 22% lower reboiler duty, compared to a monoethanolamine (MEA) solvent. Further, it was shown that the proposed OCCS with the heat pump and the AMP/PZ solvent achieved a reduction of approximately 50% in both fuel consumption and CO2 emissions along with 26.9 USD reduction for capturing one ton of CO2, compared to the OCCS with a boiler and MEA solvent.KEYWORDS: CO2 emissionssteam generationrate-based modelheat pump Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis study was supported by the Korea Research Institute of Ships and Ocean engineering, grant from Endowment Project of "Technology Development of Onboard Carbon Capture and Storage System and Pilot Test" funded by Ministry of Oceans and Fisheries [grand number PES4750].