Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1996-05-31
1998-08-11
Maples, John S.
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
429 17, 423237, 423238, H01M 806
Patent
active
057925720
ABSTRACT:
Ammonia which is found in fuel cell fuel gases is removed therefrom by passing the fuel gas stream through a scrubber bed of porous carbon pellets containing phosphoric acid. The ammonia reacts with the phosphoric acid in the scrubber bed to form ammonium phosphate compounds which remain in the scrubber bed. The ammonia content of the fuel gas stream is thus lowered to a concentration of about one ppm or less. By maintaining the temperature of the fuel gas stream passing through the scrubber bed in a range of about 400.degree. F. to about 450.degree. F. sufficient phosphoric acid will also be evaporated from the scrubber bed to replace acid electrolyte lost during operation of the power plant. Adjustments in the temperature of the fuel gas flowing through the scrubber may be made in order to match electrolyte losses which occur during different operating phases of the power plant. The scrubber formed in accordance with this invention thus serves two functions, one being to remove ammonia from the fuel gas stream, and the other being to replenish electrolyte lost in the power plant during normal operation thereof.
REFERENCES:
patent: 4259302 (1981-03-01), Katz et al.
patent: 5213912 (1993-05-01), Kunz et al.
patent: 5419978 (1995-05-01), Landau
Breault Richard D.
Foley Peter F.
Fredley Robert R.
Luczak Francis J.
Preston, Jr. John L.
International Fuel Cells, Inc.
Jones William W.
Maples John S.
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