10.1016/j.energy.2019.116019

The integration of anaerobic digestion and thermal gasification can ensure a high biomass utilization, as the unconverted biomass from digesters can be converted by thermal gasification. When integrating steam electrolysis or co-electrolysis, all the CO and CO2 in the biogas and gasification gas can...

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Bibliographic Details
Published inEnergy (Oxford) Vol. 188; p. 1
Main Authors Clausen, Lasse R, Butera, Giacomo, Jensen, Søren Højgaard
Format Journal Article
LanguageEnglish
Published Oxford Elsevier BV 01.12.2019
Subjects
Anaerobic digestion
Biogas
Biomass
Carbon dioxide
Electrolysis
Electrolytic cells
Energy conversion efficiency
Energy efficiency
Gasification
Manures
Natural gas
Refuse as fuel
Steam
Substitute natural gas
Thermodynamic models
Yield
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Summary:The integration of anaerobic digestion and thermal gasification can ensure a high biomass utilization, as the unconverted biomass from digesters can be converted by thermal gasification. When integrating steam electrolysis or co-electrolysis, all the CO and CO2 in the biogas and gasification gas can be upgraded to synthetic natural gas (SNG), achieving a very high bio-SNG yield per biomass input. In this paper, a highly integrated system combining anaerobic digestion, thermal gasification, and pressurized solid oxide cells for bio-SNG production from manure is presented and analyzed by thermodynamic modeling. The system is compared to a similar system without anaerobic digestion. The analysis finds that the energy yield of bio-SNG can reach 138% in relation to the manure input (LHV-dry), while the yield drops to 107% without anaerobic digestion. The total energy efficiency from manure and electricity to bio-SNG can reach 79% with anaerobic digestion and 64% without it. By combining thermal gasification and anaerobic digestion, it is thereby almost possible to reach the same efficiency as a thermal gasification system operating on wood (up to 84%).
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2019.116018