Steam-cooled blading with steam thermal barrier for reheat gas turbine combined with steam turbine

Abstract

Steam-cooling with a steam thermal barrier for reheat gas turbine vanes and blades offers advantages over cooling with air or water at the higher temperatures characteristic of existing high temperature gas tubines, in particular when coupled with a reheat steam cycle. Consequently, in such a combined cycle, higher cycle efficiency is obtainable for gas turbine initial firing temperatures of about 2500.degree. F. (1371.degree. C.) and 2050.degree. F. (1121.degree. C.) reheat temperatures where over-all combined cycle degradation resulting from steam cooling is below about 1%. A proposed combined reheat gas turbine and steam turbine cycle includes a gas turbine having steam-cooled components operating at a cycle pressure ratio of about 38 without intercooling and includes steam superheating in the reheat combustor.

Dependencies are inferred from the claim text.