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Dresden, Germany

Greco A.,University of Genoa | Sorce A.,University of Genoa | Littwin R.,EBZ GmbH | Costamagna P.,University of Genoa | Magistri L.,University of Genoa
EFC 2013 - Proceedings of the 5th European Fuel Cell Piero Lunghi Conference | Year: 2013

We focus on a laboratory-size SOFC system and we investigate reformer degradation and failure both experimentally and through a model; comparison between experimental and modeling results is presented and discussed. The results show that reforming faults are highly dangerous because they can generate large thermal gradients in the SOFC stack. Fault maps are presented and discussed, which are the basis of a fault detection and identification tool. Copyright © 2013 Delta Energy and Environment. Source


Greco A.,University of Genoa | Sorce A.,University of Genoa | Littwin R.,EBZ GmbH | Costamagna P.,University of Genoa | Magistri L.,University of Genoa
International Journal of Hydrogen Energy | Year: 2014

The effects of fuel processor faults in an solid oxide fuel cell (SOFC) system are analyzed. Focusing on a laboratory-size SOFC system, a reformer fault is investigated both experimentally and through a model; comparison between experimental and modeling results is presented and discussed. The results show that some types of reformer faults can be dangerous, because they can give rise to local thermal gradients as large as 10-20·102 K/m or more in the SOFC stack. Simulation results show that SOFC stacks employing metallic interconnects are expected to withstand faults of larger magnitude than SOFC stacks employing ceramic interconnects. Fault maps are presented and discussed, which can be the basis for the development of a fault detection and isolation (FDI) tool. © 2014 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Schimanke D.,Staxera GmbH | Posdziech O.,EBZ GmbH | Mai B.E.,Staxera GmbH | Kluge S.,EBZ GmbH | And 2 more authors.
ECS Transactions | Year: 2011

Solid oxide fuel cells (SOFCs) are known for high electrical efficiency, and especially the ESC (electrolyte supported cells) for good robustness for system operation. Nevertheless common system concepts that use CPOX (catalytic partial oxidation) or SR (steam reforming) as fuel processing still show disadvantages. CPOX systems will not pass efficiencies beyond 35% and SR systems need additional water processing that increases complexity, as well as initial and operational costs. A technical solution for those disadvantages is a staged system design, staxera GmbH has developed a concept and EBZ GmbH has designed, built and operated a proof-of-concept installation including a serial connection of two SOFC stacks. This system design achieved an electrical efficiency of 55% due to double use of fuel gas in stage two. In contrast to other highly efficient SOFC systems, mostly SR systems, no additional water supply and processing were needed. ©The Electrochemical Society. Source


Voss S.,TU Bergakademie Freiberg | Posdziech O.,EBZ GmbH | Posdziech O.,Staxera GmbH | Valldorf J.,VDI VDE Innovation Technik GmbH | Trimis D.,TU Bergakademie Freiberg
International Journal of Energy for a Clean Environment | Year: 2011

Fuel cell technology offers an efficient energy conversion pathway from hydrocarbon fuels and has become one of the attractive options in the scenarios for decentralized energy generation. This paper presents a multi-fuel micro-combined heat and power (CHP) system based on a modular planar solid oxide fuel cell (SOFC), which is capable of operating with gaseous and liquid hydrocarbon fuels. First results from the operation of the system on natural gas and with a 500 Wel stack are presented in this work; for the final system development, a nominal electrical output of 1.5 kWel is intended. The developed system is operated by a heat-driven procedure and an electrical efficiency on the order of 30% is targeted. The planar SOFC stack constitutes the core part of the unit and enables fuel flexibility as well as a simple and compact system design. The applied reforming strategy is based on a robust, multi-fuel, thermal partial oxidation reformer combined with a ceramic wall-flow filter for retention of soot particles which can be easily regenerated. Several additional balance-of-plant components have been developed for the micro-CHP system so as to handle heat recovery and utilization of the stack's exhaust gases. The aforementioned components include compact high-temperature heat exchangers and a flexible post-combustion system. © 2011 by Begell House, Inc. Source

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