Hydrogen from Natural Gas for Fuel Cells

1969 ◽  
pp. 221-231 ◽  
Author(s):  
JOHN MEEK ◽  
B. S. BAKER
Keyword(s):  
Fuel Cells ◽  
Natural Gas

Study on Internal Phenomena of Solid Oxide Fuel Cells Using Liquefied Natural Gas as Fuel

2021 ◽  
Author(s):  
Min Soo Kim ◽  
Young Sang Kim ◽  
Young Duk Lee ◽  
Minsung Kim ◽  
dongkyu Kim
Keyword(s):  
Fuel Cells ◽  
Natural Gas ◽  
Solid Oxide Fuel Cells ◽  
High Current Density ◽  
Liquefied Natural Gas ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Density Region ◽  
Fuel Flexibility ◽  
High Power Output

Abstract This study analyzed the internal phenomena of solid oxide fuel cells driven by liquefied natural gas. Reforming reactions of liquefied natural gas constituent in the solid oxide fuel cells were examined. First, the performance of solid oxide fuel cells using liquefied natural gas was compared to those using methane as fuel. Liquefied natural gas-driven solid oxide fuel cells outperformed methane-driven solid oxide fuel cells under all current conditions, with a maximum performance difference of approximately 12.8%. Then, the effect of inlet composition ratio on the internal phenomena in the solid oxide fuel cells was examined. The lower the steam-to-carbon ratio, the higher the steam reforming reaction in the cell. By changing the ratio, 7.1% of more hydrogen could be reformed. Finally, the effect of reformer operation on the internal phenomena in the solid oxide fuel cells was examined. Under 0.35 A/cm2, lower pre-reforming rate of reformer enhance the performance of solid oxide fuel cells. At high current density region, however, a higher pre-reforming rate of reforming is more favorable because the reforming reaction is rare in solid oxide fuel cells. This research can provide guidelines for achieving high power output of solid oxide fuel cells with high fuel flexibility.

The LAJ Cycle: A New Combined-Cycle Fossil Fuel Power System

2002 ◽  
Author(s):  
Roddie R. Judkins ◽  
Timothy R. Armstrong ◽  
Solomon D. Labinov
Keyword(s):  
Fuel Cells ◽  
Natural Gas ◽  
Power System ◽  
Fossil Fuel ◽  
High Efficiency ◽  
National Laboratory ◽  
Combined Cycle ◽  
Mitigation Strategies ◽  
Model Calculations ◽  
Oak Ridge

Oak Ridge National Laboratory (ORNL) has developed a novel system for combined-cycle power generation, called the LAJ cycle. This system could serve as a basis for the development of a new generation of high-efficiency combined cycles. In one of several possible configurations of the new combined-cycle fossil fuel power system, natural gas enters the system at 4.0 MPa and about 300 K, is heated and reformed, and is transferred to a turbine at 4.0 MPa and 1200 K. The gas expands in the turbine to 0.6 MPa and 800 K, and then flows successively to heat exchangers and a condenser-separator, after which it is separated into two gas streams, one containing principally CO with some CH4 and water vapor and the other containing pure H2. The CO and H2 flow to separate fuel cells and undergo electrochemical oxidation with the concomitant production of electricity. Separate streams of water and carbon dioxide (CO2) are produced, making this cycle compatible with carbon mitigation strategies based on sequestration. Model calculations indicate combined-cycle efficiencies greater than 70% based on the lower heating value of natural gas. The high efficiencies realized result from a combination of the high-pressure natural gas reformate expansion and the highly efficient CO and H2 fuel cells. Most of the power derives from the fuel cells in the system.

CO Capture From Natural Gas Combined Cycle Power Generation Using Carbonate Fuel Cells

2019 ◽  
Author(s):  
Gabor Kiss ◽  
Timothy A. Barckholtz ◽  
Rodrigo F. Blanco Gutierrez ◽  
Lu Han ◽  
Brandon O'Neill ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cells ◽  
Natural Gas ◽  
Combined Cycle ◽  
Natural Gas Combined Cycle
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