Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 240-250 |
| Number of pages | 11 |
| Journal | Fuel |
| Volume | 94 |
| DOIs | |
| Publication status | Published - 2012 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- Bromine
- chlorine
- corrosion
- solid recovered fuel
- waterwall
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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 journal › Article › Scientific › peer-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 -