Production of sustainable methane from renewable energy and captured carbon dioxide with the use of Solid Oxide Electrolyzer: Athermodynamic assessment

Jan Pawel Stempien, Meng Ni, Qiang Sun, Siew Hwa Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)

Abstract

A possible pathway for renewable and sustainable methane production from captured carbon dioxide, water (or seawater) and renewable electricity is proposed and analysed. The proposed system includes Solid Oxide Electrolyzer Cell combined with ex-situ methane synthesis reactor comprising Sabatier, Methanation and Water-Gas Shift reactions. A well validated electrochemical model is used to describe the behaviour of the electrolyzer for steam/carbon dioxide co-electrolysis. The methane synthesis reactor is modelled by a set of equations based on thermodynamic equilibrium reaction constants. Effects of current density, temperature, pressure and initial steam to carbon dioxide ratio on system performance are analysed and their effects are discussed. It is found that a simple, single-pass system without heat recuperation could achieve a maximum overall energy efficiency of 60.87% (based on lower heating value), a maximum electrical energy efficiency of 81.08% (based on lower heating value), and a maximum amount of methane production of ~1.52Nm3h-1m-2of electrolyzer. It is also found that conversion of ~100% captured carbon dioxide is possible in the proposed system.
Original languageEnglish
Pages (from-to)714-721
Number of pages8
JournalEnergy
Volume82
DOIs
Publication statusPublished - 15 Mar 2015

Keywords

  • Methane
  • Modelling
  • Renewable fuel
  • Solid Oxide Electrolyzer
  • Sustainable system analysis
  • Synthetic fuel
  • Synthetic natural gas (SNG)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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