Baseline Data on Utilization of Low-Grade Fuels in Gas Turbine Applications Volume 2:Hot Component Corrosion Evaluation

摘要

EPRI Project RP1079-2 was established to compare the corrosion of turbine parts when operated with residual oil versus distillate oil. A metallographic evaluation of combustion turbine hot components, which showed partial residual versus total distillate fuel firing, revealed no discernable differences in component degradation (hot corrosion). Considering the time of operation, the degree of hot corrosion observed was somewhat greater than expected for oil-fired combustion turbines of similar designs and alloy selections. This abnormality was attributed to the ingestion of high levels of sodium contaminated mist from the adjacent cooling tower through the turbine compressor inlet. Corrosion due to vanadium compounds in the heavy fuel machines was practically nil, which indicates that residual fuel is satisfactory for use in combustion turbine plants.