hydrogen pressure swing recirculation system · hydrogen pressure swing recirculation system...
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Hydrogen Pressure Swing Recirculation System Benjamin de GRISARD
EFC 2013
Roma, Le 11-13 december 2013
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PEMFC Functioning
Hydrogen consumption at the anode Water created at the cathode going through the membrane in the anode
Hydrogen Pressure Recirculation System
EFC 2013 Benjamin de GRISARD 2
PEMFC Principle Feasibility Integration Conclusion
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Water managment
disadvantages : Electrical consumption of the pump Vibrations and noises caused by the pump
Hydrogen Pressure Recirculation System
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Anodic compartmentPressureRegulator
pumpWater trap
Anodic compartmentPressureRegulator
disadvantages : Hydrogen lost Safety
Constant leak and periodic purge : Pump recirculation loop:
PEMFC Principle Feasibility Integration Conclusion
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Modifications : Solenoid valve and a pressure measurment
Two check valves
Gas tank
Hydrogen Pressure Recirculation System
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Pressure measurment
Anodic compartmentPressure regulator
P
Solenoid valve
Gas tank
Water trap
Check valve CV1
Check valve CV2
Pressure swing recirculation system[1]
PEMFC Principle Feasibility Integration Conclusion
[1]: M. Uno, T. Shimada, et K. Tanaka, « Reactant recirculation system utilizing pressure swing for proton exchange membrane fuel cell », Journal of Power Sources, vol. 196, no 5, p. 2558‑2566, mars 2011.
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Hydrogen Pressure Recirculation System
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1 2
PEMFC Principle Feasibility Integration Conclusion
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Hydrogen Pressure Recirculation System
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PEMFC Principle Feasibility Integration Conclusion
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PEMFC Principle Feasibility Integration Conclusion
Hydrogen Pressure Recirculation System
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Impact of the different parameters : Pressure limit Gas tank volume Crack pressure of the check valve Flow rate through the solenoid valve
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-1
0
1
2
3
4
5
100000
110000
120000
130000
140000
150000
160000
0 5 10 15 20 25 30
Flow
rat
e(N
m3/
h)
Pre
ssur
e (P
a)
Time (s)
Pressure and Flow Rate vs Time
Flow rate
P gas tank
P stack
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Conditions: 70 cells, A=200 cm², 5 kW V=12 L λc=3 T=343 K (70°C) I=100 A (0,5 A/cm²)
PEMFC Principle Feasibility Integration Conclusion
0
10
20
30
40
50
60
0,3 0,5
Effi
cien
cy (
%)
Current density (A/cm²)
Efficiency of the system
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Increase of 2.5% Increase of 5%
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PEMFC Principle Feasibility Integration Conclusion
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Integrated system
Instrumented gas tank Stack
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PEMFC Principle Feasibility Integration Conclusion
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Dead End Dead End Pressure swing recirculation
Hydrogen Pressure Recirculation System
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PEMFC Principle Feasibility Integration Conclusion
0.3 Current density (A/cm²) 0.5
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Hydrogen Pressure Recirculation System
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PEMFC Principle Feasibility Integration Conclusion
0
2
4
6
8
10
12
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
0 500 1000 1500 2000 2500
Flow
rat
e (N
m3/
h)
Volt
age
(V)
temps (s)
Test on a second stack
Tension
Débit max
Débit moyen
T = 70°C λair = 3 Pcathode=1,2 bar Panode=1.4 - 1.2 bar Vtank=4L Pcrack=0.03bar 70 cellules S = 200 cm²
Voltage
Max flow rate
Mean flow rate
Versatility
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Hydrogen Pressure Recirculation System
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PEMFC Principle Feasibility Integration Conclusion
Conclusion Few impact on the stack functioning Increase of the performance of the fuel cell system At least, as compact as the pump recirculation system Can be integrated Must be redesigned for every stack
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Hydrogen Pressure Recirculation System
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PEMFC Principle Feasibility Integration Conclusion
Future Long term experiment Impact of the nitrogen on the pressure swing recirculation system Study on the impact of the different parameters
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Hydrogen Pressure Recirculation System
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PEMFC Principle Feasibility Integration Conclusion
Thank you for your Attention