Page 20 - 德国埃克斯玛_EXMAR_案例分析_应用介绍-不锈钢管接头_不锈钢_卡套接头_高压球阀_针阀_流量调节阀_液压系统_NC夹紧环

Stainless steel
in fuel cells
EXAMPLE OF APPLICATION

DLR – German Aerospace Center
D-70569 Stuttgart www.dlr.de

Development and manufacturing of high and low-temperature fuel cells

The German Aerospace Center in Stuttgart develops both low-temperature as well as high-temperature fuel
cells, of which the operating temperature is 80°C or 750°C, respectively. These are energy converters which
convert the chemical energy of fuel gases into electrical energy via an electrochemical reaction. This proc-
ess, also called cold combustion, is characterised by the extremely low emission of harmful substances and
the high degree of efficiency. For example, with the ceramic high-temperature cell systems (Solid Oxide Fuel
Cell, SOFC) an overall electric efficiency of up to 65% is realised. Fuel cells are, therefore, instrumental in
achieving a highly efficient and low-emission energy supply and transportation means. The spectrum of po-
tential uses of fuel cell technology is wide, ranging from portable devices e.g. for cell phones, to mobile ap-
plications such as power engines and even stationary power plants with high-efficiency cogeneration of heat
and power.

APPLICATION
EXMAR products: NC-compression ferrule unions, stainless steel flexible hoses, hose fittings with
male adaptors, metal seals, from 06 - 22mm, light versions
Some with special OX cleaning for use with oxygen
Application area: High-temperature fuel cells

PARAMETERS
Medium: Hydrogen, oxygen,
nitrogen, carbon monoxide,
carbon dioxide, methane,
steam, compressed air
Pressure: unpressurised, max. 0.5bar
Temperatures: up to 800°C cont. operation
– 5.000 operating hours

Tube systems to supply the high-temperature fuel cells with gases

In co-operation with several industrial partners, the German Aerospace Center has developed a lightweight
concept of solid oxide fuel cells to improve the performance and efficiency of fuel cell stacks. The high oper-
ating temperatures of approx. 700°C to 800°C make it particularly difficult to select materials that are suffi-
ciently resistant. Many requirements in regard to capacity, fuel gas utilisation, weight, volume, long-term
stability, must be complied with mobile applications. In addition, high thermal cyclability and a short start time
of the fuel cell system is required.

© SERTO GROUP, Switzerland www.serto.com – www.exmar.de DLR Stuttgart Brennstoffzellen e.doc