Study of the oxidation to high temperature of eight alloys in atmospheres of combustion of biomass

Authors

  • C. Berlanga-Labari Departamento de Ingeniería Mecánica, Energética y de Materiales, Universidad Pública de Navarra
  • J. J. Fernández-Carrasquilla Departamento de Ingeniería Mecánica, Energética y de Materiales, Universidad Pública de Navarra

DOI:

https://doi.org/10.3989/revmetalm.2008.v44.i4.126

Keywords:

High Temperature corrosion, Chorine Attack, Superheaters, Biomass

Abstract


The combustion of biomass, especially wheat straw, generates very corrosive media particularly near the superheater tubes. Chlorine is known to be the main corrosive agent in biomass-fired plants. This paper focuses on the study of the corrosivity of such environments composed of gases and ashes, at high temperature, on eight commercial alloys with different chromium and nickel contents. These have been: AISI 347 CG (1.4550), AISI 347 FG(1.4550), AISI 316LN (1.4910), ESSHETE 1250 (1.4982), AC 66 (1.4877), X20CrMoV12:1 (1.4922) and AISI 347 coated with Inconel 625 and Inconel 686. Corrosion tests in the boiler have been performed during 8.000 h and 15.000 h at temperatures between 500 °C y 550 °C in the biomass plant of Sangüesa (Navarra, Spain). Experimental results showed an unacceptable behaviour far the martensitic steel, acceptable far the austenitics and good far the inconels. The appearance of the corrosion attack was also investigated to obtain understanding of the corrosion mechanism. The corrosion mechanism by molten salts has been rejected. The active oxidation corrosion mechanism has been proposed as the most probable in order to interpretate the corrosion behaviour of these materials in these environments.

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Published

2008-08-30

How to Cite

Berlanga-Labari, C., & J. Fernández-Carrasquilla, J. (2008). Study of the oxidation to high temperature of eight alloys in atmospheres of combustion of biomass. Revista De Metalurgia, 44(4), 343–354. https://doi.org/10.3989/revmetalm.2008.v44.i4.126

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