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Oxide scale exfoliation and regrowth in TP347H superheater tubes / A. S. Sabau in Materials and corrosion, Vol. 63 N° 10 (Octobre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 10 (Octobre 2012) . - pp. 896–908 Titre : Oxide scale exfoliation and regrowth in TP347H superheater tubes Type de document : texte imprimé Auteurs : A. S. Sabau, Auteur ; I. G. Wright, Auteur ; J. P. Shingledecker, Auteur Année de publication : 2013 Article en page(s) : pp. 896–908 Note générale : Génie mécanique Langues : Anglais (eng) Résumé : This paper provides an introduction to a comprehensive model being developed to predict and control oxide scale exfoliation from the steam-side of superheater and reheater tubes in steam boilers. The model deals with the main phenomena involved in scale growth and failure in steam, and incorporates major variables related to boiler design and operation. The considerations used to calculate oxide growth under the specific constrains of small diameter tubes carrying high-pressure steam and operating with large temperature gradients under temperature and pressure cycling conditions, as well as the evolution of stresses and strains in the scales, are indicated but only a cursory description is given of the details of the analytical treatments. An example is presented of calculations made with the model to predict the extent of blockage expected in a single superheater loop as a function of time and outlet steam temperature under several realistic service conditions. The results suggest that problems due to scale exfoliation would be expected early in the operating life of superheater tubes made from austenitic steel TP347H. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206640/abstract [article] Oxide scale exfoliation and regrowth in TP347H superheater tubes [texte imprimé] / A. S. Sabau, Auteur ; I. G. Wright, Auteur ; J. P. Shingledecker, Auteur . - 2013 . - pp. 896–908. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 10 (Octobre 2012) . - pp. 896–908 Résumé : This paper provides an introduction to a comprehensive model being developed to predict and control oxide scale exfoliation from the steam-side of superheater and reheater tubes in steam boilers. The model deals with the main phenomena involved in scale growth and failure in steam, and incorporates major variables related to boiler design and operation. The considerations used to calculate oxide growth under the specific constrains of small diameter tubes carrying high-pressure steam and operating with large temperature gradients under temperature and pressure cycling conditions, as well as the evolution of stresses and strains in the scales, are indicated but only a cursory description is given of the details of the analytical treatments. An example is presented of calculations made with the model to predict the extent of blockage expected in a single superheater loop as a function of time and outlet steam temperature under several realistic service conditions. The results suggest that problems due to scale exfoliation would be expected early in the operating life of superheater tubes made from austenitic steel TP347H. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206640/abstract