Integration of oxycombustion and microbial electrosynthesis for sustainable energy storage

[Display omitted] •A power-to-gas system able to valorise existing CO2 industry emissions to methane.•CH4 is produced by microbial electrosynthesis using oxycombustion CO2 (OxyMES)•Oxygen production from MES is used for oxycombustion in an industrial C-fuel boiler.•Able to achieve 100% autonomy of e...

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Bibliographic Details
Published in:Energy conversion and management Vol. 269; p. 116002
Main Authors: Diego-García, Ruth, Morán, Antonio, Romeo, Luis M.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-10-2022
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Summary:[Display omitted] •A power-to-gas system able to valorise existing CO2 industry emissions to methane.•CH4 is produced by microbial electrosynthesis using oxycombustion CO2 (OxyMES)•Oxygen production from MES is used for oxycombustion in an industrial C-fuel boiler.•Able to achieve 100% autonomy of external feedstock supplies thanks to tanks system.•OxyMES energetically doesn’t penalize the process vs an oxy-fuel conventional plant. Power-to-gas technology makes use of surplus electricity by its conversion and storage in the form of a gas. Currently power-to-gas schemes based on biological processes are of great interest. Microbial electrosynthesis (MES) cells are biological systems that produce biogas via microbial action and a supply of electrical energy. The OxyMES scheme proposed is a power-to-gas system that seeks to neutralize the CO2 emissions of a standard industrial process through the hybridization of oxy-fuel combustion and bioelectrochemical processes that produce CH4 (in cathode) and O2 (in anode). This oxygen is used for oxycombustion in an industrial C-fuel boiler. The energy balance analysis yielded a power-to-gas efficiency in the MES cell close to 51%, and the overall performance of the OxyMES integrated system was close to 60% for a cell with a Faradaic efficiency of 80%, CO2-to-CH4 conversion rate of 95%, and ΔVcell = 1.63 V. With the proper sizing of the CO2, O2, and biogas process tank system, it is possible to achieve 100% autonomy, free from external feedstock supplies.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2022.116002