Overview of OT
- Georgia Power Co., Atlanta, GA (United States)
- Electric Power Research Institute, Palo Alto, CA (United States)
At the last International Fossil Cycle Chemistry Conference in June 1991, a report was given on the Electric Power Research Institute (EPRI) sponsored project to study and transfer technology on the use of oxygenated feedwater treatment (OT). The report basically summarized the excellent results of employing OT worldwide, and updated the project activities which included development of an EPRI guidance document for implementation of OT in US utilities. Since the OT conversions of Georgia Power`s Wansley Unit No. 1 and Ohio Edison`s Sammis Unit 5 in November 1991, over 30 once-through units have subsequently been converted. In 1994, the first US drum unit was converted. The results have been outstanding with very large reductions of feedwater corrosion products (usually Fe<1 ppb at the economizer inlet) as a result of the more oxidizing environment (>+120 mV) and the change of the surface oxide layer from magnetite to ferric oxide hydrate (FeOOH) throughout the feedwater system. The benefits accrue because FeOOH blocks the pores of original Fe{sub 3}O{sub 4} reducing the transport of oxygen and iron ions through the layer. These surface layers of FeOOH also have a much lower solubility in flowing feedwater. This paper will provide an overview of the two supercritical/subcritical unit feedwater treatment technologies, (OT & AVT). In addition, the results of the two EPRI OT demonstration units (Wansley 1, Georgia Power Co. & Sammis 5, Ohio Edison) will be presented.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States)
- OSTI ID:
- 50720
- Report Number(s):
- EPRI-TR-104502; CONF-940982-; TRN: 95:003576-0026
- Resource Relation:
- Conference: 4. international conference on fossil plant cycle chemistry, Atlanta, GA (United States), 7-9 Sep 1994; Other Information: PBD: Jan 1995; Related Information: Is Part Of Proceedings: Fourth international conference on fossil plant cycle chemistry; Dooley, R.B.; Pate, S.R. [eds.]; PB: 681 p.
- Country of Publication:
- United States
- Language:
- English
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