High-Temperature-Turbine Technology Program: Phase II. Technology Test and Support Studies. Update of Overall Plant-Design Description Combined-Cycle Electric-Power Plant Operating on Coal-Derived Liquid Fuel

摘要

Changes made to the preliminary design of a commercial combined cycle electric powerplant operating on coal-derived liquid fuel are described. Major elements changed are: the gas turbine configuration; and steam system operating parameters. The net power output of this baseload station was increased from 665 MW to 806 MW, principally as a result of increasing the size of the four gas turbines. The gas turbine configuration was changed from a 2-spool, annular burner arrangement to a single shaft engine with can-type combustors. Firing temperature was revised from 3000 tp 2750 exp 0 F. The free power turbine arrangement of the original powerplant concept which permits double-ending the electrical generators was retained. The steam system configuration was changed from an 1800/1000 single level system to a 2400/1000/1000 single reheat configuration which utilizes heat extraction from the hot flue gas down to 280 exp 0 F. The steam system produces 347 MW of electrical power. The coal-derived liquid fuel used in this study is the same as that originally selected, a distilled fuel product derived from the H-coal process with a higher heating value estimated to be 17,800 Btu/lb. The modular arrangement of the original powerplant design was retained. The gas turbine concept with free power turbines and double-ended alternator permits the powerplant to operate over a wide range of output at optimum component efficiency. The overall powerplant efficiency is 47.4%. This figure is conservatively based on demonstrated performance of commercial or near-commercial components utilized in the design, including the 2750 exp 0 F transpiration air-cooled turbine concept which was successfully tested at conditions simulating the combustion of coal-derived fuel. (ERA citation 07:046576)