Time and temperature effects on alkali chloride induced high temperature corrosion of superheaters during biomass firing

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Time and temperature effects on alkali chloride induced high temperature corrosion of superheaters during biomass firing. / Okoro, Sunday Chukwudi; Montgomery, Melanie; Jappe Frandsen, Flemming; Pantleon, Karen.

In: Energy and Fuels, Vol. 32, No. 7, 2018, p. 7991-7999.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{e02da45698dd473099dcb0c02476d7c1,
title = "Time and temperature effects on alkali chloride induced high temperature corrosion of superheaters during biomass firing",
abstract = "The high content of alkali chloride in deposits which form during biomass firing in power plants contributes significantly to corrosion of the superheaters. In order to understand the influence of time and temperature on high temperature corrosion under such harsh conditions, laboratory scale studies as a function of time and temperature were carried out using KCl coated samples of the austenitic stainless steel (TP347H). To understand the progress of corrosion with time, isothermal exposures at 560 oC (from 83.5 h to 672 h), and at 600 oC (from 83.5 h to 168 h) were conducted in a gas mixture comprising of O2, H2O, CO2, HCl and SO2. In addition, samples were subjected to temperature variations between 560 oC and 600 oC to gain insights on the influence of temperature. The microstructure and elemental composition of the corrosion products resulting from the exposures were studied with scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. The results show that corrosion attack progressed with time such that the thickness of the consistently identified three regions of corrosion products increased with time, therefore suggesting that the corrosion products were not protective. Also, exposures under varying temperature conditions revealed that an increased corrosion attack would always occur once the superheater experiences a higher temperature, because, a memory effect from prior exposure at higher temperature propagates more corrosion attack during subsequent exposure to a lower temperature.",
keywords = "Biomass firing, Alkali chloride, High temperature corrosion, Thermal variation",
author = "Okoro, {Sunday Chukwudi} and Melanie Montgomery and {Jappe Frandsen}, Flemming and Karen Pantleon",
year = "2018",
doi = "10.1021/acs.energyfuels.8b01232",
language = "English",
volume = "32",
pages = "7991--7999",
journal = "Energy & Fuels",
issn = "0887-0624",
publisher = "American Chemical Society",
number = "7",

}

RIS

TY - JOUR

T1 - Time and temperature effects on alkali chloride induced high temperature corrosion of superheaters during biomass firing

AU - Okoro, Sunday Chukwudi

AU - Montgomery, Melanie

AU - Jappe Frandsen, Flemming

AU - Pantleon, Karen

PY - 2018

Y1 - 2018

N2 - The high content of alkali chloride in deposits which form during biomass firing in power plants contributes significantly to corrosion of the superheaters. In order to understand the influence of time and temperature on high temperature corrosion under such harsh conditions, laboratory scale studies as a function of time and temperature were carried out using KCl coated samples of the austenitic stainless steel (TP347H). To understand the progress of corrosion with time, isothermal exposures at 560 oC (from 83.5 h to 672 h), and at 600 oC (from 83.5 h to 168 h) were conducted in a gas mixture comprising of O2, H2O, CO2, HCl and SO2. In addition, samples were subjected to temperature variations between 560 oC and 600 oC to gain insights on the influence of temperature. The microstructure and elemental composition of the corrosion products resulting from the exposures were studied with scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. The results show that corrosion attack progressed with time such that the thickness of the consistently identified three regions of corrosion products increased with time, therefore suggesting that the corrosion products were not protective. Also, exposures under varying temperature conditions revealed that an increased corrosion attack would always occur once the superheater experiences a higher temperature, because, a memory effect from prior exposure at higher temperature propagates more corrosion attack during subsequent exposure to a lower temperature.

AB - The high content of alkali chloride in deposits which form during biomass firing in power plants contributes significantly to corrosion of the superheaters. In order to understand the influence of time and temperature on high temperature corrosion under such harsh conditions, laboratory scale studies as a function of time and temperature were carried out using KCl coated samples of the austenitic stainless steel (TP347H). To understand the progress of corrosion with time, isothermal exposures at 560 oC (from 83.5 h to 672 h), and at 600 oC (from 83.5 h to 168 h) were conducted in a gas mixture comprising of O2, H2O, CO2, HCl and SO2. In addition, samples were subjected to temperature variations between 560 oC and 600 oC to gain insights on the influence of temperature. The microstructure and elemental composition of the corrosion products resulting from the exposures were studied with scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. The results show that corrosion attack progressed with time such that the thickness of the consistently identified three regions of corrosion products increased with time, therefore suggesting that the corrosion products were not protective. Also, exposures under varying temperature conditions revealed that an increased corrosion attack would always occur once the superheater experiences a higher temperature, because, a memory effect from prior exposure at higher temperature propagates more corrosion attack during subsequent exposure to a lower temperature.

KW - Biomass firing

KW - Alkali chloride

KW - High temperature corrosion

KW - Thermal variation

U2 - 10.1021/acs.energyfuels.8b01232

DO - 10.1021/acs.energyfuels.8b01232

M3 - Journal article

VL - 32

SP - 7991

EP - 7999

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 7

ER -