BOILERS CONTROL ECONOMICS MATERIALS OF CONSTRUCTION OXYGEN SCAVENGERS REDOX SCALING TROUBLESHOOTING

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Abstract

In 2004, the Electric Power Research Institute (EPRI) recommended, in its Cycle Chemistry Guidelines for Fossil Plants: Phosphate Continuum and Caustic Treatment (1), that ﾓORP should be used to control the oxidizing power of the feedwater in all-ferrous systems, or, and more importantly, the reducing power of the feedwater in mixed metallurgy systems.ﾔ EPRI further recommended control be based on measurements made at operating temperature, rather than on samples cooled to room temperature. In 2008, a service companya commercialized technology capable of measuring and controlling oxidation-reduction potential (ORP) in situ, at operating pressures and temperatures. Since that time, about 50 power plants have adopted this control mechanism and used it to reduce their feedwater and condensate corrosion rates. This article explains the technology, its use, and the results achieved in several North American power plants.

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