Hot Corrosion/Erosion Testing of Materials for Applications for Advanced Power Conversion Systems Using Coal-Derived Fuels. Fireside II. Evaluation of Turbine Materials for Use in a Coal-Fired Fluidized Bed Combustion Environment.

摘要

This report summarizes the results of the General Electric Fireside Corrosion Task II Program. This program was designed to evaluate the erosion/corrosion behavior of gas turbine nozzle guide vane and rotor blade materials in both simulated and actual pressurized fluidized bed combustor (PFBC) environments. Simulation testing included exposing disc-shaped specimens in atmospheric pressure small burner rig test stands operated at 1600 exp 0 F (871 exp 0 C) for periods up to 1300 hours. PFBC evaluation testing consisted of exposing airfoil shaped specimens to the efflux from a PFBC in a turbine test section installed in the Exxon PFBC Miniplant facility at Linden, N.J. Candidate gas turbine materials included three cast vane and blade base alloys, FSX-414, IN-738, and U-700, and one protective coating system, platinum-chromium-aluminide (RT-22). Small burner rig testing consistently showed the nickel-base alloys U-700 and IN-738 most susceptible to corrosion/sulfidation, followed by the cobalt-base alloy FSX-414; the RT-22 coating on IN-738 was most resistant to hot corrosion attack. Parts life estimates have been made for the nickel and cobalt-base alloys based on corrosion rates determined from the PFBC testing. (ERA citation 06:002743)