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Cathode Exhaust Gas Recirculation For Polymer Electrolyte Fuel Cell Stack

Becker, Florian and Pillath, Florian and Kallo, Josef (2017) Cathode Exhaust Gas Recirculation For Polymer Electrolyte Fuel Cell Stack. EFCF 2017, 4-7 Jul. 2017, Luzern, Schweiz.

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Abstract

To ensure the required reliability and efficiency of a Polymer Electrolyte Fuel Cell (PEFC) system, an emergency situation in which the supply of ambient air has to be sealed off, is considered. In this case oxygen from a separate gas tank is fed to the fuel cell system. To prevent the loss of oxygen by the exhaust, the cathode gas can be fed back by cathode gas recirculation while oxygen is injected. Thereby the opportunity to feed back the humidity of the exhaust air for additional fuel cell humidification becomes available. The humidification of a PEFC is essential to ensure high protonic conductivity and reduce voltage losses. However, the water content of the inlet gas has to be regulated to prevent the electrodes from flooding. To control the humidity of the system the gas flow rate, the temperature of the fuel cell and the cathode gas can be adjusted. In addition, the enhanced water content in the system allows increasing the operating temperatures. This work focuses on experimental study of a 12 kW PEFC-System with cathode gas recirculation and a phenomenological model to optimize the fuel cell humidification depending on the operating parameters.

Item URL in elib:https://elib.dlr.de/116378/
Document Type:Conference or Workshop Item (Speech)
Title:Cathode Exhaust Gas Recirculation For Polymer Electrolyte Fuel Cell Stack
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Becker, FlorianFlorian.Becker (at) dlr.dehttps://orcid.org/0000-0001-6517-2944
Pillath, FlorianFlorian.Pillath (at) dlr.deUNSPECIFIED
Kallo, JosefJosef.Kallo (at) dlr.deUNSPECIFIED
Date:July 2017
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Polymer Electrolyte Fuel Cell, (PEFC), Cathode Gas Rrecirculation, Humidification, Membrane Resistance, Fuel Cell Oxygen Supply, Phenomenological Model
Event Title:EFCF 2017
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:4-7 Jul. 2017
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Hamburg
Institutes and Institutions:Institute of Engineering Thermodynamics > Energy System Integration
Deposited By: Becker, Florian
Deposited On:21 Dec 2017 12:36
Last Modified:21 Dec 2017 12:36

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