High temperature corrosion of boiler waterwalls induced by chlorides and bromides. Part 2

Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous species

D. Bankiewicz (Corresponding Author), Pasi Vainikka, D. Lindberg, A. Frantsi, J. Silvennoinen, P. Yrjas, M. Hupa

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

In Part 1 of the work a measurement campaign was carried out to determine the occurrence of corrosive ash components in a bubbling fluidized bed (BFB) boiler combusting solid recovered fuel (SRF). It was found out that the main ash-forming elements that had been vaporized and subsequently condensed from the gas phase were Na, K, S and Cl together with minor amounts of Zn, Pb, Cu, and Br. Both, Cl and Br were found in the corrosion front of the waterwalls prior to the measurement campaign. In this work, the forms of ash forming elements in the combustion gases and in the waterwall deposits of the examined boiler were predicted by means of thermodynamic equilibrium modeling. Laboratory tests were also carried out to estimate the degree of corrosion of boiler steels under bromine containing deposits. A mixture of ZnBr2 and K2SO4 was selected for high temperature lab-scale corrosion testing since Zn, Br and K as well as sulfates were present in the deposit and it was possible to compare these results to previously published results with ZnCl2–K2SO4 mixtures. The comparison showed that more severe material degradation was caused by the ZnBr2 containing salt than by the corresponding chloride and corrosion was significant already at 400 °C.
Original languageEnglish
Pages (from-to)240-250
Number of pages11
JournalFuel
Volume94
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Ashes
Bromides
Boilers
Chlorides
Thermodynamics
Corrosion
Deposits
Gases
Bromine
Caustics
Temperature
Steel
Fluidized beds
Sulfates
Salts
Degradation
Testing

Keywords

  • Bromine
  • chlorine
  • corrosion
  • solid recovered fuel
  • waterwall

Cite this

Bankiewicz, D. ; Vainikka, Pasi ; Lindberg, D. ; Frantsi, A. ; Silvennoinen, J. ; Yrjas, P. ; Hupa, M. / High temperature corrosion of boiler waterwalls induced by chlorides and bromides. Part 2 : Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous species. In: Fuel. 2012 ; Vol. 94. pp. 240-250.
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abstract = "In Part 1 of the work a measurement campaign was carried out to determine the occurrence of corrosive ash components in a bubbling fluidized bed (BFB) boiler combusting solid recovered fuel (SRF). It was found out that the main ash-forming elements that had been vaporized and subsequently condensed from the gas phase were Na, K, S and Cl together with minor amounts of Zn, Pb, Cu, and Br. Both, Cl and Br were found in the corrosion front of the waterwalls prior to the measurement campaign. In this work, the forms of ash forming elements in the combustion gases and in the waterwall deposits of the examined boiler were predicted by means of thermodynamic equilibrium modeling. Laboratory tests were also carried out to estimate the degree of corrosion of boiler steels under bromine containing deposits. A mixture of ZnBr2 and K2SO4 was selected for high temperature lab-scale corrosion testing since Zn, Br and K as well as sulfates were present in the deposit and it was possible to compare these results to previously published results with ZnCl2–K2SO4 mixtures. The comparison showed that more severe material degradation was caused by the ZnBr2 containing salt than by the corresponding chloride and corrosion was significant already at 400 °C.",
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High temperature corrosion of boiler waterwalls induced by chlorides and bromides. Part 2 : Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous species. / Bankiewicz, D. (Corresponding Author); Vainikka, Pasi; Lindberg, D.; Frantsi, A.; Silvennoinen, J.; Yrjas, P.; Hupa, M.

In: Fuel, Vol. 94, 2012, p. 240-250.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - High temperature corrosion of boiler waterwalls induced by chlorides and bromides. Part 2

T2 - Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous species

AU - Bankiewicz, D.

AU - Vainikka, Pasi

AU - Lindberg, D.

AU - Frantsi, A.

AU - Silvennoinen, J.

AU - Yrjas, P.

AU - Hupa, M.

PY - 2012

Y1 - 2012

N2 - In Part 1 of the work a measurement campaign was carried out to determine the occurrence of corrosive ash components in a bubbling fluidized bed (BFB) boiler combusting solid recovered fuel (SRF). It was found out that the main ash-forming elements that had been vaporized and subsequently condensed from the gas phase were Na, K, S and Cl together with minor amounts of Zn, Pb, Cu, and Br. Both, Cl and Br were found in the corrosion front of the waterwalls prior to the measurement campaign. In this work, the forms of ash forming elements in the combustion gases and in the waterwall deposits of the examined boiler were predicted by means of thermodynamic equilibrium modeling. Laboratory tests were also carried out to estimate the degree of corrosion of boiler steels under bromine containing deposits. A mixture of ZnBr2 and K2SO4 was selected for high temperature lab-scale corrosion testing since Zn, Br and K as well as sulfates were present in the deposit and it was possible to compare these results to previously published results with ZnCl2–K2SO4 mixtures. The comparison showed that more severe material degradation was caused by the ZnBr2 containing salt than by the corresponding chloride and corrosion was significant already at 400 °C.

AB - In Part 1 of the work a measurement campaign was carried out to determine the occurrence of corrosive ash components in a bubbling fluidized bed (BFB) boiler combusting solid recovered fuel (SRF). It was found out that the main ash-forming elements that had been vaporized and subsequently condensed from the gas phase were Na, K, S and Cl together with minor amounts of Zn, Pb, Cu, and Br. Both, Cl and Br were found in the corrosion front of the waterwalls prior to the measurement campaign. In this work, the forms of ash forming elements in the combustion gases and in the waterwall deposits of the examined boiler were predicted by means of thermodynamic equilibrium modeling. Laboratory tests were also carried out to estimate the degree of corrosion of boiler steels under bromine containing deposits. A mixture of ZnBr2 and K2SO4 was selected for high temperature lab-scale corrosion testing since Zn, Br and K as well as sulfates were present in the deposit and it was possible to compare these results to previously published results with ZnCl2–K2SO4 mixtures. The comparison showed that more severe material degradation was caused by the ZnBr2 containing salt than by the corresponding chloride and corrosion was significant already at 400 °C.

KW - Bromine

KW - chlorine

KW - corrosion

KW - solid recovered fuel

KW - waterwall

U2 - 10.1016/j.fuel.2011.12.023

DO - 10.1016/j.fuel.2011.12.023

M3 - Article

VL - 94

SP - 240

EP - 250

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -