High temperature corrosion of boiler waterwalls induced by chlorides and bromides. Part 2: Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous species

Dorota Bankiewicz*, Pasi Vainikka, Daniel Lindberg, Ari Frantsi, Jaani Silvennoinen, Patrik Yrjas, Mikko Hupa

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    28 Citations (Scopus)

    Abstract

    In Part 1 of the work a measurement campaign was carried out to determine the occurrence of corrosive ash components in a bubbling fluidized bed (BFB) boiler combusting solid recovered fuel (SRF). It was found out that the main ash-forming elements that had been vaporized and subsequently condensed from the gas phase were Na, K, S and Cl together with minor amounts of Zn, Pb, Cu, and Br. Both, Cl and Br were found in the corrosion front of the waterwalls prior to the measurement campaign. In this work, the forms of ash forming elements in the combustion gases and in the waterwall deposits of the examined boiler were predicted by means of thermodynamic equilibrium modeling. Laboratory tests were also carried out to estimate the degree of corrosion of boiler steels under bromine containing deposits. A mixture of ZnBr2 and K2SO4 was selected for high temperature lab-scale corrosion testing since Zn, Br and K as well as sulfates were present in the deposit and it was possible to compare these results to previously published results with ZnCl2–K2SO4 mixtures. The comparison showed that more severe material degradation was caused by the ZnBr2 containing salt than by the corresponding chloride and corrosion was significant already at 400 °C.
    Original languageEnglish
    Pages (from-to)240-250
    JournalFuel
    Volume94
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Funding

    Financial support from the Finnish Funding Agency for Technology and Innovation (Tekes), Stora Enso Oyj, Metso Power Oy, Lassila & Tikanoja Oyj, the Graduate School in Chemical Engineering and INECSE – Marie Curie Early Stage Training Programme is gratefully acknowledged.

    Keywords

    • Bromine
    • chlorine
    • corrosion
    • solid recovered fuel
    • waterwall

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