Abstract
The high temperature electrolysis (HOT ELLY) of water vapor using zirconia as a solid oxide electrolyte has been demonstrated in laboratory experiments to be a very efficient method of hydrogen production. This program is a cooperation between Dornier Systems, Friedrichshafen and Lurgi, Frankfurt. In this paper, the thermodynamical advantages of electrolysis at very high temperatures, typically 900–1000°C, will be briefly reviewed first. After the principal technical realization has been explained the status of the advanced cell and module development will be illustrated. The process engineering for electrolysis plants will then be discussed and our concept for building up electrolysis units introduced. Finally a cost examination and comparison with conventional H 2-production plants will be reviewed.
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