Engineer, design construct, test, and evaluate a pressurized fluidized-bed pilot plant using high-sulfur coal for production of electric power: Phase I. Preliminary engineering; Phase II. Final design; Phase III. Construction. Annual report, March 1, 1979-February 29, 1980

The extended test program on the SGT/PFB Technology Unit, previously placed in operation, was completed. Total operating time is 3378 which includes 2681 h burning coal and 1205 h total turbine engine operation. Significant performance and operational milestones, completed during the past year, included: over 2000 h on candidate heat exchanger tube materials at design temperature during which durability of iron-base alloy for PFB heat exchanger tubes was demonstrated; generated electric power with gas turbine operating on PFB coal combustion gas for 1000 h with no appreciable erosion or corrosion of turbine rotor blades and stator vanes; evaluated and improved hot gas cleanup system during which mean particle size of 1.3 Microns and a loading of 0.054 grains/Scf was achieved; and durability of hot/ash solids lock hopper valves for over 1000 h without leakage and stellite coated butterfly gas valve operating successfully for over 900 h in a highly erosive environment was demonstrated. Details of materials evolutions and corrosion rates, component performances and gaseous emission levels are presented