Fuel cell system

A fuel cell system and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as high material load, machine pressure ratio and power density limitation

Pending Publication Date: 2021-08-31
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited rotational speed, the machine is limited in terms of pressure ratio and power density
Operation of recirculation blower in wet conditions results in high material load

Method used

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  • Fuel cell system
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  • Fuel cell system

Examples

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Embodiment Construction

[0034] exist figure 1A first embodiment of a fuel cell system 10 according to the invention is shown in . The fuel cell system 10 here comprises a fuel cell 14 , of which only the anode space 18 is shown here. The anode chamber 18 is fluidically connected via a hydrogen supply line 22 to a hydrogen store 26 , which is here designed as a hydrogen tank. In the hydrogen supply line 22 , a tank shutoff valve 30 is arranged downstream of the hydrogen storage 26 in order to shut off the supply of hydrogen from the hydrogen storage 26 .

[0035] Downstream of the tank shut-off valve 30, a pressure reducer 34 is arranged in the hydrogen supply line 22 in order to bring the high pressure of the hydrogen storage 26 to a low pressure level. Downstream of this pressure reducer 34 , a low-pressure shut-off valve 38 is arranged in the hydrogen supply line 22 in order to interrupt the hydrogen supply in the low-pressure region. A hydrogen metering valve 46 is arranged between the low-pres...

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PUM

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Abstract

The present invention relates to a fuel cell system (10), comprising at least one fuel cell (14), a hydrogen store (26), in which hydrogen is stored under positive pressure, and which is connected to an anode compartment (18) of the fuel cell (14) via a hydrogen feed line (22), and an anode circuit (58), by means of which unused hydrogen at an outlet (50) of the anode compartment (18) can be recirculated into an inlet (42) of the anode compartment (18). At least one electrically driven recirculation blower (62) is provided between the outlet (50) and the inlet (42) of the anode compartment (18), by means of which blower the unused hydrogen can be fed to the inlet (42) of the anode compartment (18), and at least some of the hydrogen fed to the anode compartment (18) from the hydrogen store (26) can be introduced into at least one gas bearing (70) of the electrically driven recirculation blower (62), and the gas bearing (70) can thus be statically supportive.

Description

technical field [0001] The invention relates to a fuel cell system. Furthermore, the invention relates to a recirculation blower for such a fuel cell system and a method for operating such a recirculation blower. Background technique [0002] In mobile applications, polymer electrolyte membrane fuel cells (PEM-BZ) are preferred due to the low temperature levels in operation. This fuel cell type operates in a stoichiometric excess with excess hydrogen. The unconsumed hydrogen is recycled and supplied again for the reaction together with fresh hydrogen. Starting from the hydrogen tank (typically 350 or 700 bar standard pressure), the hydrogen pressure is reduced in several stages to an operating pressure of <10 bar. To overcome the pressure drop from the anode outlet to the anode inlet, a recirculation blower is typically used. [0003] A fuel cell system is known from DE 10 2007 037 096 A1, which has a recirculation blower arranged in the fuel circuit. Here, the recir...

Claims

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Application Information

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IPC IPC(8): H01M8/04089F25B1/00
CPCH01M8/04097Y02E60/50
Inventor M·赫尔曼H·克默尔
Owner ROBERT BOSCH GMBH
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