Abstract
This study described a methodology developed to prevent the occurrence of corrosion failure in steam turbines. The methodology was developed after the failure of a turbine blade at a plant in Brazil. Deposits were collected from various locations along the turbine blade path and analyzed. A turbine deposit collector and simulator was installed to determine the concentrations of steam impurities. Samples were collected from the low pressure turbine at the crossover point and from the polishing station and analyzed using inductive coupled plasma-mass spectrometry (ICP-MS) in order to determine if sodium levels exceeded 3 ppb. Filters were weighed in order to determine the accumulation of impurities. A 3-electrode system was used to determine the influence of chloride ions. The design of the system's condensate polisher beds was modified in order to improve condensate effluent conductivity. The condensate treatment procedure lowered the concentrations of salt impurities and established a monitoring methodology for water and steam used at the plant. It was concluded that the methodology can be used to to reduce inspection intervals and increase system reliability. 10 refs., 1 tab., 7 figs.
Pacheco, D S;
Franco, C V;
Godinho, J F;
Frech, W A;
Sonai, G G;
[1]
Torres, L A.M.;
Ellwanger, A R.F.
[2]
- Univ. Federal de Santa Catarina, Florianopolis (Brazil)
- Tractebel Energia, Capivari de Baixo (Brazil)
Citation Formats
Pacheco, D S, Franco, C V, Godinho, J F, Frech, W A, Sonai, G G, Torres, L A.M., and Ellwanger, A R.F.
Physical-chemistry aspects of water in steam turbines associated with material stress and electrochemical assessment of the AISI 403 to simulate real condition.
Canada: N. p.,
2009.
Web.
Pacheco, D S, Franco, C V, Godinho, J F, Frech, W A, Sonai, G G, Torres, L A.M., & Ellwanger, A R.F.
Physical-chemistry aspects of water in steam turbines associated with material stress and electrochemical assessment of the AISI 403 to simulate real condition.
Canada.
Pacheco, D S, Franco, C V, Godinho, J F, Frech, W A, Sonai, G G, Torres, L A.M., and Ellwanger, A R.F.
2009.
"Physical-chemistry aspects of water in steam turbines associated with material stress and electrochemical assessment of the AISI 403 to simulate real condition."
Canada.
@misc{etde_21222039,
title = {Physical-chemistry aspects of water in steam turbines associated with material stress and electrochemical assessment of the AISI 403 to simulate real condition}
author = {Pacheco, D S, Franco, C V, Godinho, J F, Frech, W A, Sonai, G G, Torres, L A.M., and Ellwanger, A R.F.}
abstractNote = {This study described a methodology developed to prevent the occurrence of corrosion failure in steam turbines. The methodology was developed after the failure of a turbine blade at a plant in Brazil. Deposits were collected from various locations along the turbine blade path and analyzed. A turbine deposit collector and simulator was installed to determine the concentrations of steam impurities. Samples were collected from the low pressure turbine at the crossover point and from the polishing station and analyzed using inductive coupled plasma-mass spectrometry (ICP-MS) in order to determine if sodium levels exceeded 3 ppb. Filters were weighed in order to determine the accumulation of impurities. A 3-electrode system was used to determine the influence of chloride ions. The design of the system's condensate polisher beds was modified in order to improve condensate effluent conductivity. The condensate treatment procedure lowered the concentrations of salt impurities and established a monitoring methodology for water and steam used at the plant. It was concluded that the methodology can be used to to reduce inspection intervals and increase system reliability. 10 refs., 1 tab., 7 figs.}
place = {Canada}
year = {2009}
month = {Jul}
}
title = {Physical-chemistry aspects of water in steam turbines associated with material stress and electrochemical assessment of the AISI 403 to simulate real condition}
author = {Pacheco, D S, Franco, C V, Godinho, J F, Frech, W A, Sonai, G G, Torres, L A.M., and Ellwanger, A R.F.}
abstractNote = {This study described a methodology developed to prevent the occurrence of corrosion failure in steam turbines. The methodology was developed after the failure of a turbine blade at a plant in Brazil. Deposits were collected from various locations along the turbine blade path and analyzed. A turbine deposit collector and simulator was installed to determine the concentrations of steam impurities. Samples were collected from the low pressure turbine at the crossover point and from the polishing station and analyzed using inductive coupled plasma-mass spectrometry (ICP-MS) in order to determine if sodium levels exceeded 3 ppb. Filters were weighed in order to determine the accumulation of impurities. A 3-electrode system was used to determine the influence of chloride ions. The design of the system's condensate polisher beds was modified in order to improve condensate effluent conductivity. The condensate treatment procedure lowered the concentrations of salt impurities and established a monitoring methodology for water and steam used at the plant. It was concluded that the methodology can be used to to reduce inspection intervals and increase system reliability. 10 refs., 1 tab., 7 figs.}
place = {Canada}
year = {2009}
month = {Jul}
}