Abstract
Today`s limit values for plant water chemistry are from a general point of view and for a specific boiler pressure. The purpose of this publication is to initiate a discussion about how and when the limit values are to be used and what limit value you should choose in every single plant. An increased use of demineralization plants instead of only softening the water gives effects for the boiler water quality. The blow down grade decreases and the boiler water concentration increases. This leads to a change in the ion balance in the boiler water. The hydroxide ion together with the sodium ion can, if they are dominating, cause alkaline stress corrosion. There are also aspects of the building of a magnetite layer in the boiler where the importance of the anion content, chlorides and sulphates, is discussed. Unfortunately, the basic data are too few to get a clear answer. The detection limits for analysis of hardness for instance, can result in that smaller leakages to the condensate are difficult to discover. Leakages with a small amount of hardness to the condensate can give rise to difficulties by causing deposits in the boiler. This is caused by the high up-concentration
More>>
Bauer, T
[1]
- AaF Energikonsult AB (Sweden)
Citation Formats
Bauer, T.
Viewpoints on limit values for water chemistry at pressures up to 80 bar; Synpunkter paa riktvaerden foer vattenkemi vid tryck upp till 80 bar.
Sweden: N. p.,
1993.
Web.
Bauer, T.
Viewpoints on limit values for water chemistry at pressures up to 80 bar; Synpunkter paa riktvaerden foer vattenkemi vid tryck upp till 80 bar.
Sweden.
Bauer, T.
1993.
"Viewpoints on limit values for water chemistry at pressures up to 80 bar; Synpunkter paa riktvaerden foer vattenkemi vid tryck upp till 80 bar."
Sweden.
@misc{etde_10142832,
title = {Viewpoints on limit values for water chemistry at pressures up to 80 bar; Synpunkter paa riktvaerden foer vattenkemi vid tryck upp till 80 bar}
author = {Bauer, T}
abstractNote = {Today`s limit values for plant water chemistry are from a general point of view and for a specific boiler pressure. The purpose of this publication is to initiate a discussion about how and when the limit values are to be used and what limit value you should choose in every single plant. An increased use of demineralization plants instead of only softening the water gives effects for the boiler water quality. The blow down grade decreases and the boiler water concentration increases. This leads to a change in the ion balance in the boiler water. The hydroxide ion together with the sodium ion can, if they are dominating, cause alkaline stress corrosion. There are also aspects of the building of a magnetite layer in the boiler where the importance of the anion content, chlorides and sulphates, is discussed. Unfortunately, the basic data are too few to get a clear answer. The detection limits for analysis of hardness for instance, can result in that smaller leakages to the condensate are difficult to discover. Leakages with a small amount of hardness to the condensate can give rise to difficulties by causing deposits in the boiler. This is caused by the high up-concentration factor. The pH-value in the steam condensate cycle as well as in the boiler water has probably a bigger influence on the corrosion than we realize today.}
place = {Sweden}
year = {1993}
month = {Nov}
}
title = {Viewpoints on limit values for water chemistry at pressures up to 80 bar; Synpunkter paa riktvaerden foer vattenkemi vid tryck upp till 80 bar}
author = {Bauer, T}
abstractNote = {Today`s limit values for plant water chemistry are from a general point of view and for a specific boiler pressure. The purpose of this publication is to initiate a discussion about how and when the limit values are to be used and what limit value you should choose in every single plant. An increased use of demineralization plants instead of only softening the water gives effects for the boiler water quality. The blow down grade decreases and the boiler water concentration increases. This leads to a change in the ion balance in the boiler water. The hydroxide ion together with the sodium ion can, if they are dominating, cause alkaline stress corrosion. There are also aspects of the building of a magnetite layer in the boiler where the importance of the anion content, chlorides and sulphates, is discussed. Unfortunately, the basic data are too few to get a clear answer. The detection limits for analysis of hardness for instance, can result in that smaller leakages to the condensate are difficult to discover. Leakages with a small amount of hardness to the condensate can give rise to difficulties by causing deposits in the boiler. This is caused by the high up-concentration factor. The pH-value in the steam condensate cycle as well as in the boiler water has probably a bigger influence on the corrosion than we realize today.}
place = {Sweden}
year = {1993}
month = {Nov}
}