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Method of operating a solid electrolyte fuel cell
| Details |
Inventors: Ippommatsu, Masamichi; Hirano, Akira; Sasaki, Hirokazu;
Assignee: Osaka Gas Company Limited (Osaka, JP)
Primary Examiner: Kalafut; Stephen
Assistant Examiner:
Attorney, Agent or Firm: Jordan and Hamburg
In a method of operating a solid electrolyte fuel cell using a light hydrocarbon such as a natural gas, naphtha or the like as the fuel oxygen-enriched air is passed to the air electrode side and a fuel prepared by steam reformation of a hydrocarbon to the fuel electrode side and the fuel is recycled. The results are improved performance in that the method offers a high output density and entails no loss of fuel. |
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DETAILED DESCRIPTION It is an object of the present invention to overcome the above-mentioned disadvantages and provide an improved method of operating a solid electrolyte fuel cell with an increased output density and a minimum of fuel loss.
It is another object of the invention to provide a method of operating a solid electrolyte fuel cell featuring a uniform temperature in the generating chamber.
The present invention provides a method of operating a solid electrolyte fuel cell including serially superimposed in the order mentioned, either a porous support adapted to insure the structural integrity of the cell, an air electrode, an electrolyte and a fuel electrode or a porous air electrode which doubles as a support, an electrolyte and a fuel electrode, wherein the air electrode is supplied with oxygen-enriched air and the fuel electrode with a fuel prepared by steam reformation of a hydrocarbon material and this fuel is recycled.
The diffusion resistance is decreased by supplying the air electrode side with the air enriched with oxygen in this manner.
Particularly when the oxygen concentration of air is not less than 90 percent by volume, the amount of N.
sub.
2 exhausted by reverse diffusion is decreased to the extent that the diffusion resistance may be virtually disregarded.
The oxygen concentration is preferably as high as possible for improving the air utilization rate as well.
However, the optimum O.
sub.
2 concentration is chosen within the range of compatibility with the efficiency of an oxygen plant (for example, a PSA plant).
Since the fuel is recycled, the fuel utilization rate per cycle is lowered to increase the theoretical electromotive voltage.
Moreover, this recycling brings the fuel utilization rate to nearly 100% as a whole so that the aforementioned loss (15.
about.
20%) due to combustion of the residual fuel is eliminated.
The fuel utilization rate per cycle is preferably 10 to 20 percent.
If the fuel utilization rate per cycle is less than 10 percent, the recycled gas entering the generating chamber containing an assemblage of cells must be preheated to a fairly high temperature
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