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.
Highlights
Response to the threat of climate change has taken a major step with the Paris Agreement [1], which is an extensive and legally binding climate agreement with target of holding global warming well below 2 ◦ C compared to pre-industrial levels
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An exposure campaign with corrosion probe was conducted in a 550 MWth circulating fluidized bed boiler at Alholmens Kraft power plant
Summary
Response to the threat of climate change has taken a major step with the Paris Agreement [1], which is an extensive and legally binding climate agreement with target of holding global warming well below 2 ◦ C compared to pre-industrial levels. Energy and climate targets to prevent greenhouse gas emissions have been tightened from the 20-20-20 targets, including 20% cut in greenhouse gas emissions from 1990 levels, 20% of EU energy from renewables and 20% improved in energy efficiency, to 2030 targets of a 40% cut in the greenhouse gas emissions and at least 27% share of renewable energy consumption [2]. While share of wind and solar energy are increasing rapidly, other renewable energy forms producing base load are needed, during and beyond the transformation period until the year 2050, when 26% to 29% of global electricity is predicted to be produced by wind and solar power [3,4]. Especially production of thermal energy by biomass, is currently the largest form of renewable energy and is expected to keep its dominant position. Biomass combustion together with enhanced recycled fuel (waste) combustion is detrimental to components of the power plants due to very reactive species that cause slagging and high temperature corrosion
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