| 摘要 |
A fuel cell system having a fuel cell stack ( 9 ) employing a phosphoric acid or other electrolyte, includes a non-reactive zone ( 11 ) in each of a group of fuel cells between corresponding coolant plates ( 55 ), the coolant entering the coolant plates in an area adjacent to the non-reactive zones ( 29-31 ). Each fuel cell has three-pass fuel flow fields, the first pass substantially adjacent to a third zone ( 13 ), remote from the first zone, the second pass substantially adjacent to a second zone contiguous with the first zone, the coolant flowing ( 33, 34 ) from a coolant inlet ( 29 ) through the first zone, to the far side of the second zone, and ( 37-41 ) from the near side of the second zone to the third zone and thence ( 45-50 ) to a coolant exit manifold ( 30 ), which assures temperatures above 150° C. (300° F.), to mitigate CO poisoning of the anode within the reactive zones, and assuring temperatures below 140° C. (280° F.) to promote sufficient condensation of evaporated electrolyte in the non-reactive zones, so as to provide a long system life.
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