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Cooling Technologies: the State of the Art • There have been no air in-leakage problems, and the vacuum systems and de-aerators have worked well. • The water chemistry is easy to control, although there are very high make-up rates (complete cycle water turnover every 2 or 3 days) because condensate from the sugar plant is either not returned or has to be discharged because of contamination. • Cleaning of the finned tube surfaces was last performed 18 months ago. The high-pressure cleaning system works well in removing the “sugar dust” coating from the fins. There were conflicting reports on the need for and the effectiveness of the cleaning. Some felt that there was no improvement in performance as a result of the cleaning. Others reported that the automatic controls had cut the fans back from full to half speed at similar operating conditions after cleaning. • No noise problems exist. Limits of 50 dB at the property boundary are easily maintained. • No corrosion problems have occurred on the condenser surfaces. • Maintenance costs are not accounted for separately but have not appeared to be excessive. The ACC unit is maintained as part of the normal plant routine by the regular staff. The performance of the unit and the plant has been satisfactory. No quantitative performance data were provided (there is no systematic monitoring), and acceptance test results were not available. Anecdotal information includes the following: • A “consensus estimate” by plant personnel indicates that the hottest summer days incur a 3- to 5-MWe reduction of output from the steam side (and a reduction of ~7 to 8 MWe on the combustion turbine side). • Fan power is the biggest plant load. There are 15 fans (each 150 hp), which in total consume about 2 MW. • No problems with wind effects have been experienced. • Freeze protection has not been a problem. (However, cold weather operating controls sometimes act strangely, i.e., fans will turn off and operators don’t know why. This is thought to be a conflict between the BDT operating system and the plant’s Foxboro I&C package, but is not considered a serious problem.) • The plant manager and engineers would like to explore methods for wet enhancement of ACC performance on the hottest days. The complete set of meeting notes is provided in Appendix C, along with extensive information on the air-cooled condenser including the following: • Schematic of the ACC flow system • ACC design data • ACC general arrangement drawings • ACC process data sheet • ACC performance summary 3-10PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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