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GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS

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GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS ( gas-turbines-in-simple-cycle-combined-cycle-applications )

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64 Fig. 78. 2x700 MW Steam Reference Power Plant 10 Fuels for Combined Cycles11 Gas turbine operators prefer to burn natural gas and light oil (diesel, No.2). As we saw previously, crude oil, residual and “bunker fuel contain corrosive components. They require fuel treatment equipment. Also, ash deposits from these fuels can result in gas turbine derating of up to 15 percent. As we also saw previously (in the case of the Shunde plant in south China), they may still be economically attractive fuels, particularly in combined-cycle plants. Sodium and potassium are removed from residual, crude and heavy distillates by a water washing procedure. A simpler and less expensive purification system will do the same job for light crude and light distillates. A magnesium additive system reduces vanadium. Note that reduced availability will result due to water cleaning shutdowns to remove blade deposits, as on-line washing, even at reduced speeds, is not effective. A shutdown with a crank soak every 100 to 120 hours is required. Reduced component life due to hot gas path corrosion caused by vanadium deposits and other corrosion is another factor to consider. Table 7 provides a sample of naphtha- and heavy oil-fired power plants in operation and in the planning stage. As this table shows, some plants (e.g., Kot Addu and Valladolid) have accumulated 30-60,000 hrs of successful operation over their first five years plus.

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