Use of Unique Fractional Electro De-Ionization (FEDI) in Power Plant Application
International Water Conference 2005
Abstract: In recent years use of EDI (Electro De-Ionization) has seen its acceptance diminish as part of Demineralization system at power plants. The paper will discuss the application of FEDI (Fractional Electro De- Ionization) in production of deionized water at two merchant power plants in Texas. The paper presents operating data and operating experience to demonstrate significant improvements made over the conventional EDI by overcoming hardness scaling, energy conservation and ion removal efficiency; in essence promoting wider acceptability with the achieved improvements in EDI module construction and operation. Fractional Electro De Ionization (FEDI) is an advanced version of Electro De Ionization process. The conventional EDI process is limited in terms of hardness tolerance and results in scaling due to precipitation of hardness. FEDI differentiates the treatment of weakly ionized and strongly ionized impurities and provides optimum driving force in terms of electrical energy in a two stage process. FEDI has specially designed media with an objective to minimize pressure drop and facilitate quick transport of all the ionic impurities into the reject stream. This design of media allows in situ regeneration of the FEDI module quickly. The paper will discuss several advancements and improvements of FEDI technology as compared to conventional EDI.
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