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Materials from Interviews with Dry Cooling System Operators Air-side cleaning issues include: • Frequency—manufacturer’s recommendation “at least annually”; last cleaning interval was 18 months. • We got somewhat conflicting stories about the need for and effect of cleaning. The main contaminant is sugar dust from loading/unloading activities at C&H. It coats the fins and biological activity creates a tough black layer. • So felt that the fouling was not obvious and there was no particular change in appearance as a result of cleaning. Others said an adherent black layer came off leaving the tubes a light gray. • So felt there was no particular improvement in performance as a result of the cleaning. Others reported that the automatic controls had cut some of the fans back from full to half speed at similar conditions after cleaning. • Wash water is discharged to straits. There is no systematic monitoring of the ACC performance. Since the gas turbines and the steam turbines are on a single shaft, there is no way to know how the two parts contribute to the output. However, Crockett does keep data records of ambient temperature, steam flow and cold water temperature leaving the ACC. It would seem to be possible to extract at least average performance information over some period of time and generate cleanliness factors for the unit. The general estimate was that very hot days cost the company 3 to 5 Mw on the steam side at “7 or 8” on the gas turbine side. Noise is not much of a problem. Limits are < 50db at the nearest residence and at 300 yards into the Bay. There is apparently no trouble in maintaining these levels. The noise on the fan deck was not excessive—comfortable to walk around. Corrosion issues include: • No known corrosion problems on the tubes or fins, at the fin-tube contacts points or at the tube header connections. The use de-mineralized water to wash and do not use external sprays for hot weather performance enhancement. • Crockett is considering installing sprays (talking with MeeSpray Humidification Division (See “Other Contacts”) and recognize that there might be corrosion/scaling problems if not operated properly. There are examples of spray enhanced units locally (Shell Martinez and TOSCO) See “Other Contacts.” Worker safety issues include: • Some problems with knowing when particular fans are locked out or just “off”. • Gear box oil is awkward to change, requires workers to hang through the fan blades. • Can get too hot on discharge side of exchangers—must limit working time to approximately 15 minutes. C-3PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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