초록 ▼

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 combin

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°F. (1371°C.) and 2050°F. (1121°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.

대표청구항 ▼

In the production of useful power wherein compressed heated gas is produced for contacting turbine blading for rotating a turbine shaft, and said turbine blading is cooled, the improvement comprising; introducing steam into the interior of said blading, directing steam from the interior of said blad

In the production of useful power wherein compressed heated gas is produced for contacting turbine blading for rotating a turbine shaft, and said turbine blading is cooled, the improvement comprising; introducing steam into the interior of said blading, directing steam from the interior of said blading substantially tangentially onto the exterior surfaces of said blading, the relative velocity of said steam directed onto the surface of said blading being substantially zero with respect to the velocity of said compressed heated gas contacting said blading, whereby the external surface of said blading is covered with a thermal barrier of steam which insulates the blading against radiant and convection heating.