Influence of the deposit CO₃/SO₄ ratio on superheater corrosion

Hanna Kinnunen; Dorota Paulina Bankiewicz; Daniel Kristoffer Lindberg; Sonja Enestam; Kari Haaga; Mikko Hupa

Influence of the deposit CO₃/SO₄ ratio on superheater corrosion

Hanna Kinnunen, Dorota Paulina Bankiewicz, Daniel Kristoffer Lindberg, Sonja Enestam, Kari Haaga, Mikko Hupa

Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

Abstract

The present trend in recovery boilers is to raise the steam parameters to increase power generation, but higher steam temperatures are known to increase the risk of corrosion in superheaters. However, other factors may be involved. The pulp mill industry is relocating to areas where pulping operations commonly use eucalyptus and acacia, typically resulting in relatively low white liquor sulphidity (28-33%). Together with increased floor loadings of recovery boilers, this has led to an increase in the carbonate content (CO₃); for example, in ESP ash, it may reach a level of 20% or higher.

This paper focusses on the effect of the CO₃/SO₄ ratio in ash on both high temperature corrosion and the first melting temperature. Several laboratory-scale corrosion studies were conducted with synthetic ashes having different CO₃/SO₄ ratios and with two commonly used superheater materials: the low alloy ferritic steel 10CrMo9-10, and the austenitic stainless steel TP347H. The results were discussed and compared to corrosion measurements in full-scale recovery boiler.

It was concluded that the CO₃/SO₄ ratio affects the melting behavior of superheater deposits to some extent. With TP347H, significant differences in corrosion resistance with varying CO₃/SO₄ ratios were observed at the two highest test temperatures: 525° and 550 °C. No correlation was found between the CO₃/SO₄ ratios and the corrosion resistance of the low alloy steel 10CrMo9-10.

Original language	Undefined/Unknown
Title of host publication	Proceedings of the 2014 International Chemical Recovery Conference
Editors	Markus Nieminen, Päivi Lampinen
Publisher	Suomen Soodakattilayhdistys / Finnish Recovery Boiler Committee
Pages	90–100
ISBN (Electronic)	978-952-68166-2-3, 978-952-68166-1-6
ISBN (Print)	978-952-68166-0-9
Publication status	Published - 2014
MoE publication type	A4 Article in a conference publication
Event	conference; 2014-06-09; 2014-06-12 - Tampere Hall, Tampere Duration: 9 Jun 2014 → 12 Jun 2014

Conference

Conference	conference; 2014-06-09; 2014-06-12
Period	09/06/14 → 12/06/14

Cite this

@inproceedings{c3b923042fca442f894daf3dcbeae159,

title = "Influence of the deposit CO₃/SO₄ ratio on superheater corrosion",

abstract = "The present trend in recovery boilers is to raise the steam parameters to increase power generation, but higher steam temperatures are known to increase the risk of corrosion in superheaters. However, other factors may be involved. The pulp mill industry is relocating to areas where pulping operations commonly use eucalyptus and acacia, typically resulting in relatively low white liquor sulphidity (28-33%). Together with increased floor loadings of recovery boilers, this has led to an increase in the carbonate content (CO3); for example, in ESP ash, it may reach a level of 20% or higher. This paper focusses on the effect of the CO3/SO4 ratio in ash on both high temperature corrosion and the first melting temperature. Several laboratory-scale corrosion studies were conducted with synthetic ashes having different CO3/SO4 ratios and with two commonly used superheater materials: the low alloy ferritic steel 10CrMo9-10, and the austenitic stainless steel TP347H. The results were discussed and compared to corrosion measurements in full-scale recovery boiler. It was concluded that the CO3/SO4 ratio affects the melting behavior of superheater deposits to some extent. With TP347H, significant differences in corrosion resistance with varying CO3/SO4 ratios were observed at the two highest test temperatures: 525° and 550 °C. No correlation was found between the CO3/SO4 ratios and the corrosion resistance of the low alloy steel 10CrMo9-10. ",

author = "Hanna Kinnunen and Bankiewicz, {Dorota Paulina} and Lindberg, {Daniel Kristoffer} and Sonja Enestam and Kari Haaga and Mikko Hupa",

note = "ISBN 978-952-68166-0-9 (hardcover) ISBN 978-952-68166-1-6 (pdf) ISBN 978-952-68166-2-3 (CD-ROM); conference; 2014-06-09; 2014-06-12 ; Conference date: 09-06-2014 Through 12-06-2014",

year = "2014",

language = "Odefinierat/ok{\"a}nt",

isbn = "978-952-68166-0-9",

pages = "90–100",

editor = "Markus Nieminen and P{\"a}ivi Lampinen",

booktitle = "Proceedings of the 2014 International Chemical Recovery Conference",

publisher = "Suomen Soodakattilayhdistys / Finnish Recovery Boiler Committee",

}

Kinnunen, H, Bankiewicz, DP, Lindberg, DK, Enestam, S, Haaga, K & Hupa, M 2014, Influence of the deposit CO₃/SO₄ ratio on superheater corrosion. in M Nieminen & P Lampinen (eds), Proceedings of the 2014 International Chemical Recovery Conference. Suomen Soodakattilayhdistys / Finnish Recovery Boiler Committee, pp. 90–100, conference; 2014-06-09; 2014-06-12, 09/06/14.

Influence of the deposit CO₃/SO₄ ratio on superheater corrosion. / Kinnunen, Hanna; Bankiewicz, Dorota Paulina; Lindberg, Daniel Kristoffer et al.
Proceedings of the 2014 International Chemical Recovery Conference. ed. / Markus Nieminen; Päivi Lampinen. Suomen Soodakattilayhdistys / Finnish Recovery Boiler Committee, 2014. p. 90–100.

Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Influence of the deposit CO₃/SO₄ ratio on superheater corrosion

AU - Kinnunen, Hanna

AU - Bankiewicz, Dorota Paulina

AU - Lindberg, Daniel Kristoffer

AU - Enestam, Sonja

AU - Haaga, Kari

AU - Hupa, Mikko

N1 - ISBN 978-952-68166-0-9 (hardcover) ISBN 978-952-68166-1-6 (pdf) ISBN 978-952-68166-2-3 (CD-ROM)

PY - 2014

Y1 - 2014

N2 - The present trend in recovery boilers is to raise the steam parameters to increase power generation, but higher steam temperatures are known to increase the risk of corrosion in superheaters. However, other factors may be involved. The pulp mill industry is relocating to areas where pulping operations commonly use eucalyptus and acacia, typically resulting in relatively low white liquor sulphidity (28-33%). Together with increased floor loadings of recovery boilers, this has led to an increase in the carbonate content (CO3); for example, in ESP ash, it may reach a level of 20% or higher. This paper focusses on the effect of the CO3/SO4 ratio in ash on both high temperature corrosion and the first melting temperature. Several laboratory-scale corrosion studies were conducted with synthetic ashes having different CO3/SO4 ratios and with two commonly used superheater materials: the low alloy ferritic steel 10CrMo9-10, and the austenitic stainless steel TP347H. The results were discussed and compared to corrosion measurements in full-scale recovery boiler. It was concluded that the CO3/SO4 ratio affects the melting behavior of superheater deposits to some extent. With TP347H, significant differences in corrosion resistance with varying CO3/SO4 ratios were observed at the two highest test temperatures: 525° and 550 °C. No correlation was found between the CO3/SO4 ratios and the corrosion resistance of the low alloy steel 10CrMo9-10.

AB - The present trend in recovery boilers is to raise the steam parameters to increase power generation, but higher steam temperatures are known to increase the risk of corrosion in superheaters. However, other factors may be involved. The pulp mill industry is relocating to areas where pulping operations commonly use eucalyptus and acacia, typically resulting in relatively low white liquor sulphidity (28-33%). Together with increased floor loadings of recovery boilers, this has led to an increase in the carbonate content (CO3); for example, in ESP ash, it may reach a level of 20% or higher. This paper focusses on the effect of the CO3/SO4 ratio in ash on both high temperature corrosion and the first melting temperature. Several laboratory-scale corrosion studies were conducted with synthetic ashes having different CO3/SO4 ratios and with two commonly used superheater materials: the low alloy ferritic steel 10CrMo9-10, and the austenitic stainless steel TP347H. The results were discussed and compared to corrosion measurements in full-scale recovery boiler. It was concluded that the CO3/SO4 ratio affects the melting behavior of superheater deposits to some extent. With TP347H, significant differences in corrosion resistance with varying CO3/SO4 ratios were observed at the two highest test temperatures: 525° and 550 °C. No correlation was found between the CO3/SO4 ratios and the corrosion resistance of the low alloy steel 10CrMo9-10.

M3 - Konferensbidrag

SN - 978-952-68166-0-9

SP - 90

EP - 100

BT - Proceedings of the 2014 International Chemical Recovery Conference

A2 - Nieminen, Markus

A2 - Lampinen, Päivi

PB - Suomen Soodakattilayhdistys / Finnish Recovery Boiler Committee

T2 - conference; 2014-06-09; 2014-06-12

Y2 - 9 June 2014 through 12 June 2014

ER -