Journal Article

FZJ-2020-05358

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Biogas-Oxyfuel Process as a Carbon Source for Power-to-Fuel Synthesis: Enhancing Availability while Reducing Separation Effort

Schorn, F. (Corresponding author)FZJ*RWTH* ; Lohse, D.FZJ* ; Samsun, R. C.FZJ* ; Peters, R.FZJ* ; Stolten, D.FZJ*RWTH*

2021
Elsevier Amsterdam ˜[u.a.]œ

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Please use a persistent id in citations: http://hdl.handle.net/2128/26863  doi:10.1016/j.jcou.2020.101410

Abstract: Producing synthetic fuels via Power-to-Fuel processes requires hydrogen and a carbon source. To attain a sustainable fuel, both reactants must originate from a renewable source. For the carbon source, biogas plants offer substantial potential. Hence, this paper presents a new biogas-oxyfuel process that couples a biogas plant with Power-to-Fuel production and enables a decentralized and economical supply of biogenic carbon dioxide for the production of renewable methanol. By using the oxygen byproduct of the Power-to-Fuel synthesis in the oxyfuel combustion of a combined heat and power unit, a simple separation of the CO2 in the flue gas is made possible. To analyze the thermodynamic changes within the combustion engine when switching from regular to oxyfuel combustion, an AspenPlus model of the combined heat and power unit of a biogas plant is built up herein. Due to the higher heat capacity of the new working gas carbon dioxide in comparison to nitrogen, the ideal Otto engine cycle’s mechanical efficiency drops by percentage point. This drop in efficiency leads to a loss in revenue for the operator of the biogas plant. Together with the additional equipment expenditures for the CO2 separation, this loss is defined as the CO2 separation costs. For a retrofit of existing biogas plants with an installed electric power of 75−1000 kW, the CO2 separation costs are determined to be 88−33 €/t. The process shown therefore offers a promising way to deliver biogenic CO2 at low cost for decentralized Power-to-Fuel systems.

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-14)
2. Technoökonomische Systemanalyse (IEK-3)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)
2. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)
3. 1111 - Effective System Transformation Pathways (POF4-111) (POF4-111)
4. 1112 - Societally Feasible Transformation Pathways (POF4-111) (POF4-111)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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