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Methane Assisted Solid Oxide Co-Electrolysis Process for Syngas Production
https://doi.org/10.15518/isjaee.2019.28-33.049-062
Abstract
In this study, methane assisted high temperature steam/CO2 co-electrolysis process is performed on symmetrical cells with a configuration of SFM-SDC/LSGM/SFM-SDC to produce high-quality synthesis gas (syngas, a mixture of H2 and CO). The Nernst potential has been evaluated for solid oxide cells in the methane assisted mode, which is reduced by nearly one order of magnitude through substituting the anode atmosphere from air to methane. The open circuit voltage (OCV) is –0.06 V at 800 °C, and an electrolysis current density of –242 mAcm–2 has been obtained at 850 °C and 0.3 V. Effects of operating conditions on products composition have been revealed by using the chemical equilibrium co-electrolysis model and HSC software. High-quality syngas with high conversion rate of CO2 to CO as well as ideal H2/CO molar ratio of 2 could be achieved in both electrode sides by adjusting appropriate operating conditions. The short-term cell voltage is slightly fluctuant less than 0.05 V at 850 °C and –120 mAcm–2 , in which condition carbon deposition has been observed in the SFM-SDC anode due to the low O2– /CH4 ratio.
About the Authors
Ya. Wang
School of Power and Mechanical Engineering, Wuhan University
China
China
Yao Wang
Wuhan, Hubei, 430072, China
T. Liu
School of Power and Mechanical Engineering, Wuhan University;
Suzhou Institute of Wuhan University
China
China
Tong Liu
Wuhan, Hubei, 430072, China;
Suzhou, Jiangsu 215123, China
L. Lei
University of South Carolina
United States
United States
Libin Lei Department of Mechanical Engineering
Columbia, SC, 29208, USA
F. Chen
University of South Carolina
United States
United States
Ph.D., Professor, Department of Mechanical Engineering
Columbia, SC, 29208, USA
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Review
For citations:
Wang Ya., Liu T., Lei L., Chen F. Methane Assisted Solid Oxide Co-Electrolysis Process for Syngas Production. Alternative Energy and Ecology (ISJAEE). 2019;(28-33):49-62. (In Russ.) https://doi.org/10.15518/isjaee.2019.28-33.049-062
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