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Coatings 2016, 6(4), 65; doi:10.3390/coatings6040065

Corrosion Testing of Thermal Spray Coatings in a Biomass Co-Firing Power Plant

VTT Technical Research Centre of Finland Ltd., P.O. Box 1000, FI-02044 VTT, Finland
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Academic Editor: Pedro Neto
Received: 20 September 2016 / Revised: 31 October 2016 / Accepted: 19 November 2016 / Published: 24 November 2016
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Abstract

Large-scale use of biomass and recycled fuel is increasing in energy production due to climate and energy targets. A 40% cut in greenhouse gas emission compared to 1990 levels and at least a 27% share of renewable energy consumption are set in EU Energy Strategy 2030. Burning fuels with high content of corrosive species such as chlorine and heavy metals causes deterioration of boiler components, shortened lifetime, limited availability of a plant and hence higher maintenance and investment costs and lower thermal and economic efficiency. Coatings can be applied to protect the critical boiler components against high temperature corrosion. In this study, five thermal spray coatings were tested in an actual biomass co-firing boiler for 1300 h with a measurement probe. The coatings were analyzed after the exposure by metallographic means and scanning electron microscope/energy-dispersive X-ray spectroscope (SEM/EDX). The deposits formed on the specimens were analyzed by X-ray fluorescence. At 550 °C, the coatings showed excellent corrosion performance compared to reference material ferritic steel T92. At 750 °C, tube material A263 together with NiCr and NiCrTi had the highest corrosion resistance. To conclude, thermal spray coatings can offer substantial corrosion protection in biomass and recycled fuel burning power plants. View Full-Text
Keywords: thermal spray; coating; corrosion; high temperature; protection; boiler thermal spray; coating; corrosion; high temperature; protection; boiler
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Oksa, M.; Metsäjoki, J.; Kärki, J. Corrosion Testing of Thermal Spray Coatings in a Biomass Co-Firing Power Plant. Coatings 2016, 6, 65.

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