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.
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 |
Keywords
- thermal spray
- coating
- corrosion
- high temperature
- protection
- boiler