Effect of temperature on corrosion of furnace walls in a waste wood fired boiler
2015 (English)In: Materials at High Temperature, ISSN 0960-3409, Vol. 32, no 1-2, 188-196 p.Article in journal (Refereed) Published
One way of reducing the furnace wall corrosion is to lower the temperature of the wall by reducing the boiler pressure. To test this, four coupons of 16Mo3 were exposed in the furnace wall of a waste wood fired boiler for 1075 h. The temperatures of the samples were individually controlled in the range 280-410 degrees C. The corrosion rates and corrosion mechanism were investigated. The deposits were analysed by XRD and SEM/EDS. The corrosion fronts were studied by focused ion beam milling (FIB)/EDS. The environment was modelled by Thermo-Calc. The amount of potassium and chlorine in the deposit decreased with decreasing temperature. The FIB sections showed a distinctive iron chloride layer at the corrosion front, with an outer layer of iron oxide. The corrosion rate decreased with decreasing metal temperature, but the boiler pressure needs to be reduced to a low level to achieve this, which is not beneficial for the electrical efficiency and therefore not a viable way of reducing corrosion.
Place, publisher, year, edition, pages
2015. Vol. 32, no 1-2, 188-196 p.
High temperature corrosion, Microscopy of cross-section corrosion, Biomass, Chlorine induced attack, Thermodynamic modelling, 16Mo3, Waterwalls
IdentifiersURN: urn:nbn:se:kth:diva-161149DOI: 10.1179/0960340914Z.000000000100ISI: 000348713300025ScopusID: 2-s2.0-84942413073OAI: oai:DiVA.org:kth-161149DiVA: diva2:796181
QC 201503182015-03-182015-03-092015-10-15Bibliographically approved