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Corrosion Resistance of Novel Coatings on Ferritic Steels for Oxycombustion–Supercritical Steam Boilers: Preliminary Results

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Abstract

Increasing the efficiency of coal fired steam power plants is an important contribution towards clean coal power. In fact, new ferritic steels are expected to withstand 325 bar and 650 °C. Moreover, in order to facilitate CO2 capture oxygen can be used instead of air for combustion (oxycombustion) so that no NOX emissions are produced. Boiler components, such as superheater tubes, are exposed to both steam and fireside corrosion and at higher temperatures, ferritic steels corrode at very fast rates under both atmospheres. A solution can be found in the use of protective coatings, a number of which, applied by techniques capable of depositing said coatings both on the inner and outer surfaces of tubes, are being studied within nationally and European funded projects. In particular, two new Ni and Cr modified aluminide coatings deposited on P92 by non-line-of-sight hybrid processes have been produced and the preliminary results of on-going laboratory testing, both under oxycombustion model atmospheres as well as under pure steam at 650 °C are promising, in particular those exhibited by the Cr enriched aluminide coating. Moreover, results obtained in a pilot oxycombustion boiler operated by CIUDEN in Leon, Spain are also shown.

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Acknowledgments

The authors are grateful for the support by the Spanish Ministry of Economy and Competitiveness for financial support (ENE2011-29203-C02-01) as well as the EC (POEMA, G.A. No.: 310436). We also acknowledge ENDESA for supporting the pilot plant tests at CIUDEN and all members of the Metallic Materials Area at INTA for technical support.

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Authors and Affiliations

  1. Instituto Nacional de Técnica Aeroespacial, Ctra. Ajalvir Km 4, 28850, Torrejón de Ardoz, Spain

    Alina Agüero, Ignacio Baraibar, Vanessa González & Daniel Plana

  2. Ingeniería de Sistemas para la Defensa de España SA, Calle Beatriz de Bobadilla No. 3, 28040, Madrid, Spain

    Raúl Muelas

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  1. Alina Agüero
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  2. Ignacio Baraibar
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  3. Vanessa González
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  4. Raúl Muelas
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  5. Daniel Plana
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Correspondence to Alina Agüero.

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Agüero, A., Baraibar, I., González, V. et al. Corrosion Resistance of Novel Coatings on Ferritic Steels for Oxycombustion–Supercritical Steam Boilers: Preliminary Results. Oxid Met 85, 263–281 (2016). https://doi.org/10.1007/s11085-015-9575-y

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