SOFC stack testing at Prototech - measurements for stable stack - - PowerPoint PPT Presentation
SOFC stack testing at Prototech - measurements for stable stack operation International Symposium on Diagnostic Tools for Fuel Cell Technologies Trondheim, 23 June 2009 Helge Weydahl, Ivar Wrnhus, Tomas Ryberg, Jarle Farnes, Arild Vik
International Symposium on Diagnostic Tools for Fuel Cell Technologies Trondheim, 23 June 2009 Helge Weydahl, Ivar Wærnhus, Tomas Ryberg, Jarle Farnes, Arild Vik Prototech AS
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About Prototech Requirements for stable SOFC operation BioCellus BKK pilot plant Conclusion
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Prototech is a provider of technical solutions, product design and manufacturing services covering application areas from space to consumer products
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A part of the Christian Michelsen Research (CMR) group Prototech has been involved in fuel cell development since 1991 40 employees, revenue 47 MNOK (5.3 M€)
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Solid oxide fuel cells
Credit: NOAA
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Solid oxide fuel cells Regenerative fuel cell (PEM) systems for telecom satellites
Credit: NOAA
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Solid oxide fuel cells Regenerative fuel cell (PEM) systems for telecom satellites High temperature PEM fuel cell system for small passenger ferry
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Solid oxide fuel cells Regenerative fuel cell (PEM) systems for telecom satellites High temperature PEM fuel cell system for small passenger ferry Production of electricity and hydrogen from natural gas with integrated CO2 capture (ZEG)
Credit: NOAA
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Sufficient air supply to cathode Sufficient fuel supply to anode Sufficient steam supply to anode Control of oxygen partial pressure on anode: Low fuel supply → shift of equilibrium towards higher oxygen partial pressure → oxidation of anode Low steam supply → shift of equilibrium towards lower oxygen partial pressure → extraction of oxygen from ceramic interconnects
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Cell voltages Stack temperature On the wish list: Gas flow distribution Gas flow composition
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Heat
CH4 + H2
E l Project sponsored by the EU 6th framework programme TU Munich, TU Delft, NTUA and other European partners Develop and demonstrate SOFC operating on gasified biomass
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Heat
CH4 + H2
E l CO2 neutral electricity production Heat from SOFC used as input for gasifier (temperature ~900 oC) Plant efficiency (biomass to electricity): 50% (60% with steam cycle)
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First SOFC stack operated on real woodgas About 12 hours operation on woodgas No degradation observed during test
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Stack voltage and current upon increase in load
27 28 29 30 31 32 33 34 35 36 16:09:07 16:12:00 16:14:53 16:17:46 16:20:38 16:23:31
Time Current (A), Stack voltage (V)
Current Stack voltage
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Decreasing trend in cell voltage indicates insufficient fuel supply from the gasifier
0.6 0.65 0.7 0.75 0.8 16:09:07 16:12:00 16:14:53 16:17:46 16:20:38 16:23:31
Time Average cell voltage (V)
V40-V36 V36-V-32 V32-V24 V24-V8 V8-V4 V4-CC
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3+3 kW SOFC plant for combined heat and power - designed and manufactured by Prototech Sponsored by BKK and Innovation Norway Operating on natural gas at Kollsnes Industrial Park (LNG plant at the west coast of Norway)
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BKK-pilot 10 20 30 40 50 60 100 200 300 400 500 600 700 800 900 Time (hours) Stack voltage (V) 200 400 600 800 1000 1200 1400 1600 Power (W)
Stack 2 Current A S2 C40 V Power
1800 hours of operation
Stable SOFC performance under regular operating conditions
BKK - Pilot
5 10 15 20 25 30 35 40 45 800 1000 1200 1400 1600 1800 Time (hours) Stack Voltage (V) 100 200 300 400 500 600 Power (W) Stack voltage Curremt Power
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Unstable water supply to reformer (clogged water filter) resulted in fluctuating stack voltage
5 10 15 20 25 30 35 40 750 760 770 780 790 800
Time (hours) Stack voltage (V)
Current Stack voltage
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Stable operation under regular operating conditions Monitoring of cell voltage and temperature is sufficient to ensure stable operation of SOFC stacks Monitoring of fuel supply distribution and composition would be a useful tool for optimisation of stack design
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