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Paper details | |
Title: | Experimental Characterisation of Materials for Biomass Co-Firing |
Author(s): | O'Hagan, C.P., O'Brien, B.J., Leen, S.B., Monaghan, R.F.D |
Document(s): | |
Abstract: | Increased rates of corrosion during the cofiring of peat with biomass have been identified as a limiting factor on the level of biomass viable to use. The present work is motivated by the need for mechanismsbased models to simulate this process. Experimental studies on pure iron are presented, without the complexities of alloying elements, to develop a fundamental understanding of the corrosion process during cofiring of peat and biomass. A synthetic salt with chemical composition representative of insitu plant measurements is applied to specimens in a furnace at 540°C for up to 4 weeks. The corrosion layer from interrupted tests is analysed using scanning electron microscopy (SEM), optical microscopy (OM) and energy dispersive Xray spectroscopy (EDX) to provide insight into the material degradation and structure of the corrosion layer. Two distinct types of oxide are identified from the tests. The first, a compact, uniform oxide layer which forms over the substrate initially. As corrosion proceeds, this layer degrades, leading to spallation and formation of a mixture of corrosion debris into the salt layer. Healthy iron was found to separate from the substrate and undergo oxidation from both above and below. A mechanism for this corrosion process is suggested. |
Keywords: | biomass, co-firing, corrosion, oxidation, power generation, fluidized bed |
Topic: | Biomass Conversion Technologies for Heating, Cooling and Electricity |
Subtopic: | Solid biofuels combustion in large utilities |
Event: | 22nd European Biomass Conference and Exhibition |
Session: | 2BV.2.45 |
Pages: | 723 - 730 |
ISBN: | 978-88-89407-52-3 |
Paper DOI: | 10.5071/22ndEUBCE2014-2BV.2.45 |
Price: | FREE |