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Method for operating fuel cell system

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, circuits, etc., can solve the problems of fuel cell performance degradation, hydrogen concentration reduction, etc., and achieve the effect of low cost and significant energy advantages

Inactive Publication Date: 2014-05-14
DAIMLER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of the constant volume of the recirculation line, the hydrogen concentration decreases and the performance of the fuel cell deteriorates

Method used

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  • Method for operating fuel cell system
  • Method for operating fuel cell system
  • Method for operating fuel cell system

Examples

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Embodiment Construction

[0023] exist figure 1 A very schematically shown fuel cell system 1 can be seen in FIG. The fuel cell system includes as an essential component a fuel cell 2 which is supposed to be designed as a PEM fuel cell. The fuel cell has an anode chamber 3 which is formed separately from a cathode chamber 5 of the fuel cell 2 by a membrane 4 for the passage of protons. Typically, the fuel cell 2 is designed in such a way that it is designed as a stack of individual cells, a so-called fuel cell stack.

[0024]Oxygen is supplied to the cathode space 5 of the fuel cell 2 via an air supply device 6 as an air supplier. In this way, the unconsumed exhaust gas from the cathode chamber 5 , which always still contains a certain amount of residual oxygen, flows into the area of ​​the burner, preferably the catalytic burner 7 . In this case, the exhaust gas is reburned together with hydrogen from the exhaust gas of the anode chamber 3 in a manner that will be explained further below. The hot ...

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Abstract

The invention relates to a method for operating a fuel cell system (1) comprising at least one fuel cell (2) which has an anode chamber (3) and a cathode chamber (4), wherein anode exhaust gas can flow out of the anode chamber (3), and the fuel cell system is provided with a recirculation process for the anode exhaust gas around the anode chamber (3). The method is characterized in that below a specified maximum load (Ix) of the fuel cell (2), the fuel cell is operated with recirculation of the anode exhaust gas, and the fuel cell is operated between the base load (Ix) and the full load (Imax) of the fuel cell (2) under a condition without recirculation of the anode exhaust gases.

Description

technical field [0001] The invention relates to a method for operating a fuel cell system according to the type further defined in the preamble of claim 1 . Background technique [0002] Fuel cell systems are known from the general prior art. These fuel cell systems utilize, for example, fuel cells which may be designed as PEM fuel cells to generate electrical energy from air, oxygen and hydrogen. Such fuel cell systems can be used, for example, in motor vehicles for generating electrical drive power. [0003] In principle, it is now possible to operate a fuel cell with a cathode chamber supplied with air and an anode chamber supplied with hydrogen or a hydrogen-containing gas, in particular to design the anode chamber as an anode chamber closed on one side . If only pure hydrogen is supplied to the anode space, this hydrogen is in principle completely converted in the fuel cell, so that no medium flows out of the anode space. It is currently the case in practice that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04
CPCH01M8/04097H01M8/04156H01M8/04589H01M8/04753H01M8/04111Y02E60/50
Inventor F·布兰克S·德恩M·耶瑟C·马佐塔M·乌尔
Owner DAIMLER AG