Enhancing Corrosion Resistance Superheater Alloys

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The efficiency of biomass-fueled power plants are much lower than those of natural gas and coal-fueled plants because exit steam temperatures are restricted to inhibit corrosion of superheater tubes. Nexterra needs to raise steam conditions from 403°C to 460°C in future systems in order to satisfy customer demands. The raise in superheater conditions increases the probability of corrosion issues due to contaminants in the fuel. In order to achieve the more aggressive steam conditions it is necessary to modify boiler design to include boiler tube materials that are resistant to corrosion. Nexterra has therefore engaged the Berlinguette group at The University of British Columbia in light of their expertise in making thin metal coatings that could potentially serve as anticorrosion materials. These materials will be used in a targeted testing program to examine whether large savings in capital and maintenance costs can be achieved with a protective corrosion layer. The outcomes of this project have the potential to strengthen Nexterra?'s position as a global leader in plant-scale, energy-from-waste gasification systems for the production of clean, renewable heat and power.