Predictions of Combustion Turbine Performance in Pressurized Fluidized-Bed Combustion Power Plants. Final Report

摘要

Large utility combustion turbines have not expanded PFB (pressurized, fluidized bed) combustion gases. Consequently, the erosion, deposition and corrosion tolerances of these machines to particulates and chemical contaminants contained in the gases is not known. This report provides an assessment of tolerances for utility turbines operating with PFBC power plants. Differences between erosion environments produced in large utility turbines and cascades or small turbines are explored to evaluate the extent which cascade and small turbine test results indicate erosion tolerances of large utility turbines. Experimental data are complemented with mechanistic analyses to describe general erosion/deposition/corrosion potential characteristics expected for PFBC power plant turbines and to evaluate tolerances for two existing utility turbines, each operating with a specific PFBC power plant. Intervals for turbine maintenance due to erosion and deposition degradations are projected for alternative particulate cleanup systems used with each plant. Effects of combustor operating conditions (excess air levels and sulfur removal efficiencies) on turbine corrosion/deposition potential are explored. Turbine design modifications are identified which might improve tolerances to PFB combustion gases and potentially increase turbine reliability and reduce gas cleanup and turbine maintenance costs. (ERA citation 81:025443)