Process integration and optimization of a solid oxide fuel cell - Gas turbine hybrid cycle fueled with hydrothermally gasified waste biomass

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• 作者：Emanuele Facchinetti ; ^{emanuele.facchinetti@epfl.ch} ; Martin Gassner ; Matilde D&rsquo ; Amelio ; Fran&ccedil ; ois Marechal ; Daniel Favrat
• 关键词：Hydrothermal biomass gasification ; Hybrid cycle ; SOFC ; Process design ; Process integration ; Optimization
• 刊名：Energy
• 出版年：2012
• 期刊代码：11_03605442
• 类别：pw
• 出版时间：May, 2012
• 卷：41
• 期：1
• 页码：408-419
• 文件大小：1497 K

摘要

Due to its suitability for using wet biomass, hydrothermal gasification is a promising process for the valorization of otherwise unused waste biomass to synthesis gas and biofuels. Solid oxide fuel cell (SOFC) based hybrid cycles are considered as the best candidate for a more efficient and clean conversion of (bio) fuels. A significant potential for the integration of the two technologies is expected since hydrothermal gasification requires heat at 673-773 K, whereas SOFC is characterized by heat excess at high temperature due to the limited electrochemical fuel conversion.

This work presents a systematic process integration and optimization of a SOFC-gas turbine (GT) hybrid cycle fueled with hydrothermally gasified waste biomass. Several design options are systematically developed and compared through a thermodynamic optimization approach based on First Law and exergy analysis.

The work demonstrates the considerable potential of the system that allows for converting wet waste biomass into electricity at a First Law efficiency of up to 63%, while simultaneously enabling the separation of biogenic carbon dioxide for further use or sequestration.