F - Mech Eng,Light,Heat,Weapons – 01 – K
Patent
F - Mech Eng,Light,Heat,Weapons
01
K
60/43
F01K 23/02 (2006.01)
Patent
CA 1170842
ABSTRACT Steam-cooling with a steam thermal barrier for vanes and blades in a gas generator or power turbine is disclosed. This has particular application to apparatus for generating useful power by reheating gas generator turbine exhaust gases to directly generate power, or alternatively, by reheating this exhaust gas to directly generate power and further reheating superheated steam by heat exchange for combined gas reheat and steam superheating with optional steam reheating as well. Steam-cooling offers advantages over cooling with air or water at the higher temperatures characteristic of the high temperature turbine technology gas turbines coupled with the reheat steam cycle. Consequently, higher cycle efficiency is obtainable for 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 turbine having steam-cooled components can operate at a cycle pressure ratio of about 38 without intercooling and can include steam superheating in the reheat combustor. To accomplish steam cooling, steam is introduced into an internal steam distribution plenum in the turbine blading and is then directed, through nozzles, to the external surface of the blading.
432490
Abb Power Generation Ltd.
Macrae & Co.
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