Pre-oxidation and its effect on reducing high-temperature corrosion of superheater tubes during biomass firing

Sunday Chukwudi Okoro, M. Kvisgaard, Melanie Montgomery, Flemming Jappe Frandsen, Karen Pantleon

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Abstract

Superheater tubes in biomass-fired power plants experience high corrosion rates due to condensation of corrosive alkali chloride-rich deposits. To explore the possibility of reducing the corrosion attack by the formation of an initial protective oxide layer, the corrosion resistance of pre-oxidised Al and Ti-containing alloys (Kanthal APM and Nimonic 80A, respectively) was investigated under laboratory conditions mimicking biomass firing. The alloys were pre-oxidised at 900°C for 1 week. Afterwards, pre-oxidised samples, and virgin non-pre-oxidised samples as reference, were coated with a synthetic deposit of KCl and exposed at 560°C for 1 week to a gas mixture typical of biomass firing. Results show that pre-oxidation could hinder the corrosion attack; however, the relative success was different for the two alloys. While corrosion attack was observed on the pre-oxidised Kanthal APM, the pre-oxidised Nimonic 80A remained unaffected suggesting protection of the alloy from the corrosive environment.
Original languageEnglish
JournalSurface Engineering
Volume33
Issue number6
Pages (from-to)428-432
ISSN0267-0844
DOIs
Publication statusPublished - 2017

Keywords

  • Corrosion
  • Biomass
  • Chlorination
  • Sulphation
  • Superheater
  • FeCrAl alloy
  • Superalloy

Cite this

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title = "Pre-oxidation and its effect on reducing high-temperature corrosion of superheater tubes during biomass firing",
abstract = "Superheater tubes in biomass-fired power plants experience high corrosion rates due to condensation of corrosive alkali chloride-rich deposits. To explore the possibility of reducing the corrosion attack by the formation of an initial protective oxide layer, the corrosion resistance of pre-oxidised Al and Ti-containing alloys (Kanthal APM and Nimonic 80A, respectively) was investigated under laboratory conditions mimicking biomass firing. The alloys were pre-oxidised at 900°C for 1 week. Afterwards, pre-oxidised samples, and virgin non-pre-oxidised samples as reference, were coated with a synthetic deposit of KCl and exposed at 560°C for 1 week to a gas mixture typical of biomass firing. Results show that pre-oxidation could hinder the corrosion attack; however, the relative success was different for the two alloys. While corrosion attack was observed on the pre-oxidised Kanthal APM, the pre-oxidised Nimonic 80A remained unaffected suggesting protection of the alloy from the corrosive environment.",
keywords = "Corrosion, Biomass, Chlorination, Sulphation, Superheater, FeCrAl alloy, Superalloy",
author = "Okoro, {Sunday Chukwudi} and M. Kvisgaard and Melanie Montgomery and {Jappe Frandsen}, Flemming and Karen Pantleon",
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language = "English",
volume = "33",
pages = "428--432",
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Pre-oxidation and its effect on reducing high-temperature corrosion of superheater tubes during biomass firing. / Okoro, Sunday Chukwudi; Kvisgaard, M.; Montgomery, Melanie; Jappe Frandsen, Flemming; Pantleon, Karen.

In: Surface Engineering, Vol. 33, No. 6, 2017, p. 428-432.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Pre-oxidation and its effect on reducing high-temperature corrosion of superheater tubes during biomass firing

AU - Okoro, Sunday Chukwudi

AU - Kvisgaard, M.

AU - Montgomery, Melanie

AU - Jappe Frandsen, Flemming

AU - Pantleon, Karen

PY - 2017

Y1 - 2017

N2 - Superheater tubes in biomass-fired power plants experience high corrosion rates due to condensation of corrosive alkali chloride-rich deposits. To explore the possibility of reducing the corrosion attack by the formation of an initial protective oxide layer, the corrosion resistance of pre-oxidised Al and Ti-containing alloys (Kanthal APM and Nimonic 80A, respectively) was investigated under laboratory conditions mimicking biomass firing. The alloys were pre-oxidised at 900°C for 1 week. Afterwards, pre-oxidised samples, and virgin non-pre-oxidised samples as reference, were coated with a synthetic deposit of KCl and exposed at 560°C for 1 week to a gas mixture typical of biomass firing. Results show that pre-oxidation could hinder the corrosion attack; however, the relative success was different for the two alloys. While corrosion attack was observed on the pre-oxidised Kanthal APM, the pre-oxidised Nimonic 80A remained unaffected suggesting protection of the alloy from the corrosive environment.

AB - Superheater tubes in biomass-fired power plants experience high corrosion rates due to condensation of corrosive alkali chloride-rich deposits. To explore the possibility of reducing the corrosion attack by the formation of an initial protective oxide layer, the corrosion resistance of pre-oxidised Al and Ti-containing alloys (Kanthal APM and Nimonic 80A, respectively) was investigated under laboratory conditions mimicking biomass firing. The alloys were pre-oxidised at 900°C for 1 week. Afterwards, pre-oxidised samples, and virgin non-pre-oxidised samples as reference, were coated with a synthetic deposit of KCl and exposed at 560°C for 1 week to a gas mixture typical of biomass firing. Results show that pre-oxidation could hinder the corrosion attack; however, the relative success was different for the two alloys. While corrosion attack was observed on the pre-oxidised Kanthal APM, the pre-oxidised Nimonic 80A remained unaffected suggesting protection of the alloy from the corrosive environment.

KW - Corrosion

KW - Biomass

KW - Chlorination

KW - Sulphation

KW - Superheater

KW - FeCrAl alloy

KW - Superalloy

U2 - 10.1080/02670844.2016.1199128

DO - 10.1080/02670844.2016.1199128

M3 - Journal article

VL - 33

SP - 428

EP - 432

JO - Surface Engineering

JF - Surface Engineering

SN - 0267-0844

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ER -