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A Thermodynamics Model for the Assessment and Optimisation of Onboard Natural Gas Reforming and Carbon Capture

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Law, LC 
Mastorakos, Epaminondas  ORCID logo
Othman, MR 
Trakakis, A 


jats:sec jats:titleAbstract</jats:title> jats:pThe paper examines pre-combustion carbon capture technology (PreCCS) for liquefied natural gas (LNG) propelled shipping from thermodynamics and energy efficiency perspectives. Various types of LNG reformers and CCS units are considered. The steam methane reformer (SMR) was found to be 20% more energy efficient than autothermal (ATR) and methane pyrolysis (MPR) reactors. Pressure swing adsorption (PSA) had a lower energy requirement than membrane separation (MEM), cryogenic separation (CS), and amine absorption (AA) in pre-combustion carbon capture, with PSA needing 0.18 kWh/kg COjats:sub2</jats:sub>. An integrated system combining SMR and PSA was proposed using waste heat recovery (WHR) from the engine, assuming similar efficiency for LNG and Hjats:sub2</jats:sub> operation, and cooling and liquefying of the COjats:sub2</jats:sub> by the LNG. The SMR-PSA system without WHR had an overall efficiency of 33.4% (defined as work at the propeller divided by the total LNG energy consumption). This was improved to 41.7% with WHR and gave a 65% COjats:sub2</jats:sub> emission reduction. For a higher COjats:sub2</jats:sub> reduction, CCS from the SMR heater could additionally be employed, giving a maximum COjats:sub2</jats:sub> removal rate of 86.2% with 39% overall energy efficiency. By comparison, an amine-based post-engine CCS system without reforming could reach similar COjats:sub2</jats:sub> removal rates but with 36.6% overall efficiency. The advantages and disadvantages and technology readiness level of PreCCS for onboard operation are discussed. This study offers evidence that pre-combustion CCS can be a serious contender for maritime propulsion decarbonization.</jats:p> </jats:sec>jats:sec jats:titleGraphical Abstract</jats:title>




4004 Chemical Engineering, 40 Engineering, 7 Affordable and Clean Energy, 13 Climate Action

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Emission Control Science and Technology

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Springer Science and Business Media LLC
National Research Foundation (NRF), Prime Minister’s Office, Singapore, under its Campus for Research Excellence and Technological Enterprise (CREATE) programme