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Solid‐state phase stabilities of relevance to metal dusting in coal gasifier environments
Author(s) -
Tortorelli P. F.,
De Van J. H.,
Judkins R. R.,
Wright I. G.
Publication year - 1998
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/(sici)1521-4176(199805)49:5<340::aid-maco340>3.0.co;2-l
Subject(s) - chemistry , carbide , wood gas generator , coal , metal , metallurgy , materials science , organic chemistry
Thermochemical calculations involving some typical mixed‐gas environments and temperatures of gasifiers were used to examine iron‐based phase stabilities to assess the potential for metal dusting in coal gasification systems. The results indicated that Fe 3 C is only stable under conditions when certain reactions are suppressed and that FeO and Fe 0.877 S tend to form instead of the carbide. Assuming Fe 3 C is a necessary step in the metal dusting of steels, there are therefore numerous coal gasification systems where this type of carbon‐related degradation will not occur, particularly under conditions associated with higher oxygen and sulfur activities.