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Corrosion of HR3C heat exchanger alloy in a biomass fired PF utility boiler
Author(s) -
Liu C.,
Little J. A.,
Henderson P. J.,
Ljung P.
Publication year - 2000
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200011)51:11<765::aid-maco765>3.0.co;2-y
Subject(s) - flue gas , corrosion , alloy , boiler (water heating) , chemistry , metallurgy , high temperature corrosion , heat exchanger , nuclear chemistry , materials science , thermodynamics , physics , organic chemistry
Abstract Detailed microscopic examinations have been conducted on two, temperature‐regulated probes (commercial HR3C heat exchanger alloy) after being exposed to biomass flue gas inside a PF boiler for 3770 h at 600°C and 650°C respectively. Corrosion of the tube proceeds via scale formation and internal element depletion. Three characteristic types of internal corrosion have been identified depending on their position relative to the flue gas passage and deposit/flue gas chemistry. Severe, mainly internal corrosion occurs at down‐stream locations where higher potassium chloride content exists within the deposit. Corrosion mechanisms corresponding to each type of internal corrosion have been proposed based on further laboratory tests and thermodynamic analysis. The increased temperature (650°C) causes slightly higher material wastage for the alloy.