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Optimised selection of new protective coatings for biofuel boiler applications

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)642-649
Number of pages8
JournalMaterials and Corrosion-Werkstoffe und Korrosion
Volume62
Issue number7
DOIs
Publication statusPublished - Jul 2011
Publication typeA1 Journal article-refereed

Abstract

Using biofuels in power and CHP boilers can pose a challenge for materials performance. Formation of deposits containing e.g. potassium, sulphur, calcium, sodium, and chlorine can result in severe corrosion of conventional steels and alloys at relatively modest temperatures. Given suitable component design and fabrication facilities, coatings may be considered to protect the fireside surfaces. This paper aims to present a systematic approach to the design and selection criteria for protective coatings of boilers. The approach includes modelling of the process and surface conditions, optimisation of the coating process and structure, and performance validation in the laboratory and plant scales. The applied examples have included iron and nickel based HVOF and arc sprayed coatings subjected to verification field testing in boiler testing under aggressive biofuel conditions. The coatings have shown good corrosion resistance in both laboratory tests and long-term harsh field tests. The paper discusses the used approach for finding a suitable and cost effective coating for biofuel boiler applications. The paper gives test results from microstructural, corrosion resistance and field testing experience for the selected coatings.

Keywords

  • biofuel boiler, coating performance, life extension, protection