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Efficiency open circuit power plants

For an open circuit power plant, an (arbitrary) overall efficiency has been defined as W... [Pg.168]

The addition of H2O and CO2 to the fuel gas modifies the equilibrium gas composition so that the formation of CH4 is not favored. Carbon deposition can be reduced by increasing the partial pressure of H2O in the gas stream. The measurements (20) on 10 cm x 10 cm cells at 650°C using simulated gasified coal GF-1 (38% H2/56% CO/6% CO2) at 10 atm showed that only a small amount of CH4 is formed. At open circuit, 1.4 vol% CH4 (dry gas basis) was detected, and at fuel utilizations of 50 to 85%, 1.2 to 0.5% CH4 was measured. The experiments with a high CO fuel gas (GF-1) at 10 atmospheres and humidified at 163°C showed no indication of carbon deposition in a subscale MCFC. These studies indicated that CH4 formation and carbon deposition at the anodes in an MCFC operating on coal-derived fuels can be controlled, and under these conditions, the side reactions would have little influence on power plant efficiency. [Pg.144]

Extended periods at open circuit and idle conditions should be avoided to improve catalyst layer stability, hi a fuel-ceU hybrid vehicle, this can be accomphshed by utilizing the energy-storage system (e.g., batteries or capacitors) in a manner analogous to that employed in hybrids that use internal combustion engines. Owing to parasitic power requirements, fuel-cell power plants are inefficient at extremely low power therefore, the time spent at these conditions should be minimized to maximize efficiency and life. [Pg.367]


See other pages where Efficiency open circuit power plants is mentioned: [Pg.216]    [Pg.245]    [Pg.298]    [Pg.28]    [Pg.170]    [Pg.460]   
See also in sourсe #XX -- [ Pg.6 ]




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