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Deflation through fuel cell fuel recycle loop

A fuel cell and recycling technology, applied in the direction of fuel cells, fuel cell additives, circuits, etc., can solve the problems of system complexity, bleed system complexity, unfavorable safety conditions, etc.

Inactive Publication Date: 2009-01-14
INT FUEL CELLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The venting system is thus complicated and may lead to undesired system complexity and adverse safety situations

Method used

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  • Deflation through fuel cell fuel recycle loop
  • Deflation through fuel cell fuel recycle loop
  • Deflation through fuel cell fuel recycle loop

Examples

Experimental program
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Embodiment Construction

[0011] refer to figure 1 , the fuel cell power facility 9 includes a fuel cell stack 11, each of the fuel cells includes an anode flow field 13, a cathode flow field 14, and a coolant channel 15, wherein the fuel reactant gas flows through the anode flow field 13, and the oxidant reactant gas flows through the cathode flow field Field 14 , coolant flows through coolant channels 15 . The inlet 18 of the anode flow field is connected through a pressure control valve 19 to a source of hydrogen 20, which in this embodiment is impure hydrogen. The outlet 23 of the anode flow field is connected by conduit 24 to a recirculation drive 25 which may be a conventional recirculation pump driven by the fuel supply 20 or a recirculation injector. The properties of the recirculation drive can be selected to suit various implementations of the invention.

[0012] The outlet 23 of the anode flow field 13 is also connected to a bleed valve 28 through which a small amount of anode exhaust is ...

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Abstract

In a fuel cell power plant (9) air bleed is provided to the anode flow fields (13) of a stack (11) of fuel cells by introducing the air into the recycle loop (23, 24) upstream of the recycle drive (25). The source of air may be the cathode air supply device (31) that provides oxidant reactant gas to the cathode flow fields (14), or a separate, low pressure, low flow air pump (48) or a separate low pressure, low flow pump (45) connected from the cathode air supply devise (31) through flow controllers (41, 42) to the pressure side of the recycle loop (23, 24) at the exhaust of the anode flow fields (13).

Description

technical field [0001] The present invention relates to injecting air within the anode flow field of a proton exchange membrane (PEM) by mixing the air with fuel recycle gas to convert carbon monoxide to carbon dioxide and thereby reduce fouling and degradation of the anode catalyst and consequent loss of performance. Background technique [0002] It is common practice to inject (bleed) a small amount of air into the anode reactant gas flow of a PEM fuel cell. The air converts carbon monoxide, which is poisonous to the anode catalyst, into harmless carbon dioxide. Bleeding can also help oxidize other contaminants present in the fuel stream. Bleeding systems are most typically used when operating PEM fuel cell stacks on reformed fuels that have relatively high CO concentrations (at 10 to the order of 100ppm). A suitable bleed system must balance the amount of air within the anode sufficiently to provide a beneficial reduction in carbon monoxide, but not exceed the flammabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04
CPCH01M2008/1095H01M8/0668H01M8/04223H01M8/04097Y02E60/50H01M8/2457H01M8/0258H01M8/2483
Inventor M·L·佩里C·E·埃文斯
Owner INT FUEL CELLS