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

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Law, LC 
Mastorakos, Epaminondas  ORCID logo  https://orcid.org/0000-0001-8245-5188
Othman, MR 
Trakakis, A 

Abstract

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>

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Description

Keywords

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

Journal Title

Emission Control Science and Technology

Conference Name

Journal ISSN

2199-3629
2199-3637

Volume Title

Publisher

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