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Materials from Interviews with Dry Cooling System Operators The property boundaries of the plant will not accommodate evaporation ponds for cooling tower blowdown. [Note the evaporation rate is equivalent to the Blythe area.] El Dorado looked at cooling towers with VCE (brine concentrators) versus ACC, and based on their analysis, dry cooling was more economic. Also, the ACC support structure was designed for Zone 2 seismic making it less costly. The Westinghouse steam turbine was a first of its kind: It can operate at back pressures of 2 to 8.5 inches. Initially, the turbine had problems with its thrust bearing (I hate when that happens), but the problem has been repaired. The problem was not related to the ACC. There are now seven of these turbines on order, in manufacture or installed. The following information was gathered on the ACC: GEA supplied the ACC. The ACC is only used for steam condensation. There is a separate closed-loop fin-fan cooler (supplied by Balke Durr) used only for auxiliary cooling. The ACC has 5 banks with six fan bays. The fans are huge - 34 feet diameter (maybe 36 feet - George was not sure). Each multiple-speed fan requires 200 HP for a total of 6,000 HP (4.5 MW). When I visited the plant it was 60-65 F and all fans were in service and spinning slowly. The plant has been on line for 6 months and there are no signs of corrosion. The fins are probably carbon steel (George was not sure). Like almost all power plants, El Dorado is using a specialty chemical provider to monitor and control steam chemistry. El Dorado did not buy the cleaning apparatus (we saw at Crockett). They have not had problems with sand/dust in the fin crevices (as yet) even though they experience notable gusting in their area. There is a distinct loss of cooling during periods with gusting winds. Evidently, during these periods, some fans are starved of air flow (that’s GEA analysis of the situation). He had no idea of the cost of the ACC. George is actually thinking of ways to pre-cool air to the ACC to enhance overall power plant performance during the hottest days of the years. When ambient air temperature exceed 110 F, plant performance drops dramatically. We discussed the following: One idea George is thinking of is to install evaporative coolers around the open areas of the ACC. The coolers would cool some of the air drawn into the fans. C-19PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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