Technical Data Sheet
Makeup Tank Heating Retrofit – Feedwater Temperature Control
Oxygen is a dissolved gas with inverse solubility (less
solubility with increasing temperature).
Since oxygen is a very corrosive gas it must be removed in the
feedwater prior to the boiler. Removal
can be accomplished by increasing/controlling temperature and venting oxygen
to atmosphere and by chemically scavenging the oxygen (using a reducing
chemical agent such as sulfite). Ideally,
oxygen removal is primarily achieved by heating and venting - this reduces the
risk of oxygen corrosion and the amount of chemical scavenger feed required.
Increased chemical scavenger is a concern for both
cost and performance reasons (see TDS entitled Boiler
System Oxygen Control). If
the feedwater tank has no provision for temperature increase/control, and
operates at a temperature of <180 degrees F, it is a candidate to be
retrofitted with a temperature increase/control setup.
A steam sparge tube or steam injector can be used to increase
temperature and has proven successful in reducing feedwater oxygen levels and
For more, contact CSC Technology for a complete white paper.
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