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Microscopy of fireside corrosion on superheater materials for oxy-fired pulverised fuel power plants
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Microscopy of fireside corrosion on superheater materials for oxy-fired pulverised fuel power plants
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Journal Article
Microscopy of fireside corrosion on superheater materials for oxy-fired pulverised fuel power plants
2012
Overview
The current pressures for increased worldwide electricity supplies coupled with reduced environmental emissions, are leading to a revolution in the operating conditions within pulverised fuel fired boilers to improve their generating efficiencies. This paper reports results from a series of 1000 hour 'deposit recoat' laboratory tests that are assessing the effects of increasing heat exchanger surface temperatures (600, 650 and 700°C) on the fireside corrosion resulting from the combustion of a biomass/coal mix using oxy-firing (with hot flue gas recycle before desulfurisation). The results presented focus on two materials: a ferritic steel (T92) and an austenitic stainless steel (TP347HFG), to illustrate the effects of alloy Cr content. After exposure, the samples were examined using scanning electron microscopy/energy dispersive X-ray analysis to evaluate: surface morphological changes (formation of nodules and whiskers) on bare samples; microstructures of scale/deposit/metal in crosssections; and, elemental distributions. The performances of the samples were determined using dimensional metrology: pre-exposure contact metrology and post-exposure optical microscopy image analysis measurements. The metal loss data generated is being used to develop statistical models to predict the lifetimes of candidate materials for use in superheaters/reheaters in advanced power plants.
Publisher
Taylor & Francis,Taylor & Francis Ltd
