ABSTRAKT

Indirect heated gasification processes for the production of synthetic gas from coal and steam are now being intensively investigated.
For such processes research on material performance is being conducted under operation conditions particularly in the case of gasification of Rhine-Brown-Coal with its own water in an externally heated tube.
For this, nine selected steel qualities were installed in the different zones of a four meter tube and tested in gasification experiments over 100 and 500 hours.
In particular, hydrogen sulfide proved to be aggressive under the present conditions and led to considerable deterioration of the materials used.
Surprisingly catastrophic corrosion phenomena occurred on those samples located near the cold outlet of the pilot plant and exposed to temperatures of 800−1000 K. There are distinct indications that this massive corrosion is being caused by the combined action of hydrogen sulfide and hydrogen chloride.
The results are being compared with those of other investigations. They allow proposals to be made on how the process would have to be conducted with particular reference to the service life of the materials and to the selection of materials suited to this process of gasification.