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• ACC performance characteristics (turbine back pressure vs. % heat load for a range of ambient air temperature and various fan settings) El Dorado El Dorado Energy’s Boulder City Power Plant was visited on October 28, 2000. The host for the visit was George Tatar, facility manager. Detailed contact information is available in Appendix C. The plant began operation in May 2000. It is a gas-fired 540-MWe 2 x1 combined cycle (two 180-MW combustion turbines; one 180-MW steam turbine). The ACC is a GEA unit. Auxiliary cooling (lube oil, etc) is provided by a closed-loop fin-fan cooler from BDT Engineering. The steam turbine, which is of Westinghouse high back pressure design, operates over a range of 2 to 8.5 in. Hga. No capital cost information was provided. No start-up, maintenance or cleaning problems had yet been encountered on the cooling system. Some unrelated start-up problems with the steam turbine thrust bearing had been experienced. No performance data or acceptance test data were made available. Performance issues include • A “dramatic” performance drop-off when ambient temperature exceeds 110°F; and • A “distinct loss” of cooling during periods of gusting winds. The reasons given for the choice of dry cooling include • The “politics” of fresh water use in the Las Vegas area, • Unavailability of reclaimed municipal water for wet tower make-up, • Inadequate area on plant property for evaporation ponds to dispose of cooling tower blowdown, and • An economic advantage for dry cooling when compared to wet cooling with vapor compression evaporators (VCE) brine concentrators The facility manager wants to explore the use of spray cooling or some other form of wet enhancement to mitigate the performance deterioration on the hottest days. Additional information about the plant, including the original meeting notes, is included in Appendix C. Calpine On September 18, 2000, a meeting was held at the Calpine offices with Kim N. Stucki, manager, plant engineering. Contact information is in Appendix C. Cooling Technologies: the State of the Art 3-11PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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