Combustion Turbine Design Guidelines Based on Deposition/Corrosion Considerations

Abstract

The objective of this project is to evolve design guidelines based on considerations of deposition and corrosion, for future operation of large stationary combustion turbines for electric power generation. The primary emphasis of the investigation is to establish the operating blade surface temperature, considering all aspects of deposition and corrosion, for a range of fuels including residual oil and coal-derived liquids. The design guidelines that will evolve from this program will provide a data base to determine the trade-offs between metal temperature, performance, maintenance and reliability. There is, at present, some operating and lab experience that indicates the possibility of serious deposition problems as turbine inlet temperature (TlT) increases, and as the differential between TlT and blade surface temperature increases. The concern regarding corrosion effects is centered on two considerations: a) Will metal surface temperature continue to govern the corrosion process as TlT increases, and b) Will present-day additives be effective at higher in-let temperatures and cycle pressures? Evaluation of the initial test results is presented.