January 2004

Heat Transfer/Rotating Eqiupment

Gas turbine fuel nozzle refurbishment

Follow these guidelines to improve reliability and reduce emissions

Phillips, J. N., Simas, P., Fern Engineering, Inc.

One principal cause of damage to gas turbine hot-section components is imbalanced fuel distribution due to dirty or defective fuel nozzles. Having more fuel flowing to one nozzle and less to another will also cause more NO xand CO emissions because hot and cold spots are simultaneously existing in the combustion section. Those same hot spots reduce creep life of the combustion liners, transition pieces, and turbine nozzles and blades. Luckily, these problems can be minimized by careful refurbishment and calibration of the fuel nozzles. Fuel nozzle malfunctions.Gas turbines typically have multiple fuel nozzles through which fuel is injected into the combustion zone (Fig.

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