Current Concepts Regarding HRSG Water/Steam Treatment
By Brad Buecker
It is astonishing to see the many project specifications calling for oxygen scavenger (the correct term is reducing agent) feed to the condensate/feedwater system of heat recovery steam generators (HRSG). Unless the system contains copper alloys, virtually unknown in HRSGs, oxygen scavenger chemistry is a discredited concept. Organizations such as the Electric Power Research Institute (EPRI) and the International Association for the Properties of Water and Steam (IAPWS) have been very strident in broadcasting this issue, but it is clear that many developers and owner’s engineers still have not heard this message, or do not fully understand modern water treatment and chemistry concepts for HRSGs. This article provides an overview of current best practices.
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