Dedicated large-scale floating offshore wind to hydrogen: Assessing design variables in proposed typologies

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Ibrahim, Omar S.
Singlitico, Alessandro
Proskovics, Roberts
McDonagh, Shane
Desmond, Cian
Murphy, Jerry D.
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Elsevier B.V.
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To achieve the Net-Zero Emissions goal by 2050, a major upscale in green hydrogen needs to be achieved; this will also facilitate use of renewable electricity as a source of decarbonised fuel in hard-to-abate sectors such as industry and transport. Nearly 80% of the world's offshore wind resource is in waters deeper than 60 m, where bottom-fixed wind turbines are not feasible. This creates a significant opportunity to couple the high capacity factor floating offshore wind and green hydrogen. In this paper we consider dedicated large-scale floating offshore wind farms for hydrogen production with three coupling typologies; (i) centralised onshore electrolysis, (ii) decentralised offshore electrolysis, and (iii) centralised offshore electrolysis. The typology design is based on variables including for: electrolyser technology; floating wind platform; and energy transmission vector (electrical power or offshore hydrogen pipelines). Offshore hydrogen pipelines are assessed as economical for large and distant farms. The decentralised offshore typology, employing a semi-submersible platform could accommodate a proton exchange membrane electrolyser on deck; this would negate the need for an additional separate structure or hydrogen export compression and enhance dynamic operational ability. It is flexible; if one electrolyser (or turbine) fails, hydrogen production can easily continue on the other turbines. It also facilities flexibility in further expansion as it is very much a modular system. Alternatively, less complexity is associated with the centralised offshore typology, which may employ the electrolysis facility on a separate offshore platform and be associated with a farm of spar-buoy platforms in significant water depth locations.
Clean energy carrier , Power-to-X , Green hydrogen , Floating offshore wind , Floating wind to hydrogen , Offshore electrolysis , Offshore hydrogen pipelines , Hydrogen economy
Ibrahim, O. S., Singlitico, A., Proskovics, R., McDonagh, S., Desmond, C. and Murphy, J. D. (2022) 'Dedicated large-scale floating offshore wind to hydrogen: Assessing design variables in proposed typologies', Renewable and Sustainable Energy Reviews, 160, 112310 (16pp). doi: 10.1016/j.rser.2022.112310