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How to screen high temperature steels for optimal use in biofuel-heated burners for residential boilers: Role of alkali
RISE, Swerea, Swerea IVF AB.
Volvo Powertrain Sweden Product Development.
Chalmers University of Technology.
Chalmers University of Technology.
2011 (engelsk)Inngår i: NACE - International Corrosion Conference Series, 2011Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Hot parts of burners for residential boilers are subject to irregular heating cycles up to 800 °C and higher, simultaneously exposed to alkali salts, variable oxygen partial pressure - and thermal shock. Fundamental hot corrosion studies under well-controlled conditions, in combination with simple ranking tests simulating the effect of ash deposited on the alloy surface, have been performed. The investigation included four types of high-alloyed steel and two types of ash from wood and bark pellets. The work was complemented with field studies of selected damaged parts. Two mechanisms involving interaction of potassium as well as carbon under intermittent oxygen-deficient conditions with chromium from the alloys have been corroborated. A simple ranking test procedure has also been designed. It proved relevant as a screening method only after incorporating a mild thermal shock in the heat treatment sequence. A significant difference in corrosive effect, particularly on a lower chromium-alloy like 304 L, has been observed for the ash derived from the wood and bark pellets, respectively.

sted, utgiver, år, opplag, sider
2011.
Serie
International corrosion conference series, ISSN 0361-4409
Emneord [en]
Alkali corrosion, High temperature corrosion-resistant alloys, Pellet ash, Residential boilers, Screening, Thermal shock
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-13426Scopus ID: 2-s2.0-79959980081OAI: oai:DiVA.org:ri-13426DiVA, id: diva2:973633
Konferanse
Corrosion 2011
Tilgjengelig fra: 2016-09-22 Laget: 2016-09-22bibliografisk kontrollert

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