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Materials from Interviews with Dry Cooling System Operators Calpine September 18, 2000. (Monday, 2:30 PM) Kim Stucki Calpine 620 Coolidge Drive Folsom, CA 916-608-3839 General: Topics for discussion • What are the factors which influence the choice of cooling system for your power projects? • Assume: Gas-fired, combined cycle (~ 500MWe) power plant at an inland California location. Capital cost comparisons:---Cost of system from turbine flange to ultimate discharge---- • How is the comparison done? • Is there a systematic optimization to select the design points for comparison? • If so, how are the “penalty” costs evaluated • capacity shortfall on hottest periods • efficiency penalties during rest of year • lost revenues or contractual penalties for capacity replacement (or failure to deliver) • If no optimization, how are comparative design points selected? • Average temperature over year? • Design back-pressure at 1 or 2 1⁄2% exceeded dry bulb (wet-bulb)? Approaches to mitigating hot day penalties: • What is the effect of ambient dry bulb on plant output and efficiency? • On gas turbines • On steam side • Use • Any experience • Cost/reliability • Efficiency penalties during rest of year of high back-pressure turbines • Use • On gas turbines • On air cooled condensers • Other wet/dry systems • Indirect dry cooling • Heller system Other considerations: • Licensing issues • Reduced licensing time (what is it worth to get on-line “six months sooner”. C-24 of inlet spraysPDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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