Steam cooled gas turbine system
AssigneeMitsubishi Heavy Industries, Ltd.
InventorHideaki Sugishita
Life of this patent
Estimating the term…
Abstract
A steam cooled gas turbine system in a combined power plant, constituted such that a tail pipe of a combustor is cooled with intermediate pressure steam from an exhaust heat recovery boiler, or outlet bleed steam from a high pressure turbine, and the cooling steam is recovered into an intermediate pressure turbine or an intermediate area of a reheater of the exhaust heat recovery boiler, whereby thermal efficiency is improved, and a cut in NO.sub.x is achieved.
Claims6
In a steam cooled gas turbine system in a combined power plant which comprises a combination of a gas turbine plant and a steam turbine plant including a plurality of turbines having different pressure inputs, and includes an exhaust heat recovery boiler for generating steam turbine driving steam by utilizing exhaust heat from a gas turbine of the gas turbine plant, the improvement comprising:
- means for supplying generated steam from the exhaust heat recovery boiler as cooling steam for an exhaust pipe of a combustor;
- means for recovering the cooling steam applied to the exhaust pipe and applying the recovered steam to the steam turbine plant;
- and
- means for cooling the blades of the gas turbine by the use of steam bled from the outlet of a high pressure turbine of the steam turbine plant, and recovering the cooling steam, which has become hot after cooling, into an area of the reheater of the exhaust heat recovery boiler.
In a steam cooled gas turbine system in a combined power plant which comprises a combination of a gas turbine plant and a steam turbine plant including a plurality of turbines having different pressure inputs, and includes an exhaust heat recovery boiler for generating steam turbine driving steam by utilizing exhaust heat from a gas turbine of the gas turbine plant, the improvement comprising:
- steam piping means for supplying cooling steam from the exhaust heat recovery boiler to an exhaust pipe of a combustor;
- steam recovery piping means connect to the exhaust pipe of the combustor for applying the recovered steam to an intermediate pressure turbine of the steam turbine plant;
- cooling steam supply piping means for cooling the blades of the gas turbine plant connected from an outlet of a high pressure turbine of the steam turbine to the gas turbine, and
- blade cooling steam recovery piping means connected from the gas turbine to an intermediate area of the reheater of the exhaust heat recovery boiler.
Dependencies are inferred from the claim text.