High-Temperature Corrosion of Refractory Materials in Biomass and Waste Combustion: Method Development and Tests with Alumina Refractory Exposed to a K₂CO₃-KCl Mixture

Na Li, Emil Vainio, Mikko Hupa, Leena Hupa, Edgardo Coda Zabetta

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

When biomass and waste fuels are burned, alkalis and chlorine may form corrosive vapors and deposits, which can cause corrosion of boiler refractories.  A lab. method for studying refractory deterioration at temps. and conditions relevant for biomass and waste fuel combustion was developed.  Alumina refractory samples were exposed to a K2CO3-KCl mixt. at 800 and 1000 °C for 168 h.  Different approaches to analyze alkali penetration into the refractory material were tested.  The infiltration of potassium into the refractory was detd. by horizontal and vertical line scan analyses and area analyses of the sample cross section using SEM with energy-dispersive X-ray anal.  A descriptive anal. of alkali infiltration mechanisms was obtained by applying Xphase spectral imaging software.  Addnl., X-ray diffraction analyses of the cross section were made before and after exposure to detect new phases.  The method gives detailed information on the alkali penetration and the mechanism behind it and can be used to est. and compare the performance of refractories in various biomass and waste combustion conditions.

Original languageUndefined/Unknown
Pages (from-to)10046–10054
JournalEnergy and Fuels
Volume31
Issue number9
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

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