Synopsis
The present paper is concerned with equilibrium relations in refractory materials and their reaction products with coal-ash slags in slagging coal gasifiers. Phases containing chromium oxide have shown exceptional resistance to corrosion in such gasifiers. High-temperature equilibrium data on systems involving chromium oxide as a component at various oxygen partial pressures are discussed. Particular attention is given to the presence of Cr2+ in silicate melts under strongly reducing conditions. It is shown that the latter may cause large decreases in liquidus and solidus temperatures compared to those prevailing under more oxidizing conditions.
Great progress has been made in recent years in determining and interpreting thermodynamic properties of oxide and silicate solid solutions at high temperatures. Activity-composition relations in several refractory oxide phases involving chromium oxide as a component have been determined experimentally, and are discussed in the present paper. General conclusions are drawn regarding the importance of volume differences in determining the degree of deviation from ideality of oxide and silicate solid solutions.
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References
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© 1984 ECSC, EEC, EAEC, Brussels and Luzembourg
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Muan, A. (1984). Thermodynamic Aspects of the Application of Ceramics/Refractories in Advanced Energy Technologies. In: Kröckel, H., Merz, M., Van Der Biest, O. (eds) Ceramics in Advanced Energy Technologies. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6424-2_18
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DOI: https://doi.org/10.1007/978-94-009-6424-2_18
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