- The dissolved gases normally present in water cause many corrosion problems. Carbon dioxide exists in aqueous solutions and as the combine forms of carbonate and bicarbonate ions.
- Carbon dioxide dissolves in water & produces corrosive carbonic acid. The low pH resulting from this reaction a enhances the corrosive effect of oxygen. CO2 + H2O ——> H2CO3
- Heating the feed water and maintaining it at a high temperature prior to its delivery to the boiler can drive off carbon dioxide.
SENSIBLE HEAT Sensible heat produces a rise or fall in temperature of substance Sensible heat does not change physical state of substance LATENT HEAT Latent heat changes the state of substance i.e. Liquid to Gas, Solid to Liquid and Liquid to Solid in case of boiler . Latent heat does not cause temperature change in the substance
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