Abstract
| Original language | English |
|---|---|
| Article number | 65 |
| Journal | Coatings |
| Volume | 6 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2016 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- thermal spray
- coating
- corrosion
- high temperature
- protection
- boiler
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Corrosion Testing of Thermal Spray Coatings in a Biomass Co-Firing Power Plant. / Oksa, Maria; Metsäjoki, Jarkko; Kärki, Janne.
In: Coatings, Vol. 6, No. 4, 65, 2016.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Corrosion Testing of Thermal Spray Coatings in a Biomass Co-Firing Power Plant
AU - Oksa, Maria
AU - Metsäjoki, Jarkko
AU - Kärki, Janne
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - thermal spray
KW - coating
KW - corrosion
KW - high temperature
KW - protection
KW - boiler
U2 - 10.3390/coatings6040065
DO - 10.3390/coatings6040065
M3 - Article
VL - 6
JO - Coatings
JF - Coatings
SN - 2079-6412
IS - 4
M1 - 65
ER -