초록 ▼

A gas turbine combined plant, a method of operating the same, and a steam-cooling system for a gas turbine hot section are provided, whereby the generation of thermal stress can be utmost reduced. A gas turbine hot section steam cooling system (30) is designed to cool a hot section (8) of a gas turb

A gas turbine combined plant, a method of operating the same, and a steam-cooling system for a gas turbine hot section are provided, whereby the generation of thermal stress can be utmost reduced. A gas turbine hot section steam cooling system (30) is designed to cool a hot section (8) of a gas turbine unit (1) by the steam of an exhaust heat recovery boiler (2) and to supply the steam after cooling into a steam turbine (23). The system (30) comprises: a temperature detectors (15, 16) for detecting the outlet temperature of the steam of the gas turbine hot section and the outlet temperature of the steam of the exhaust heat recovery boiler, respectively, at the start-up time of the gas turbine; and a shielding valve (20) disposed to a pipe (12a) supplying the steam after cooling the gas turbine hot section to the steam turbine for shielding the steam after cooling in the case where there is a substantial difference between the both temperature levels. A regulating valve (19) is disposed to the pipe (19a) connecting the gas turbine hot section to a condenser (11) such that the steam after cooling may be recovered to the condenser in the case where there is a substantial difference between the both temperature levels.

대표청구항 ▼

[ What is claimed is:] [1.]1. A gas turbine combined plant comprising:a first path for directing steam from an exhaust heat recovery boiler to a steam turbine unit;a second path branched from said first path and connected to a condenser through a first valve unit; anda third path for directing steam

[ What is claimed is:] [1.]1. A gas turbine combined plant comprising:a first path for directing steam from an exhaust heat recovery boiler to a steam turbine unit;a second path branched from said first path and connected to a condenser through a first valve unit; anda third path for directing steam after cooling a gas turbine hot section to said first path,wherein a second valve unit is disposed to said third path, and said gas turbine combined plant further comprises a fourth path connected to said condenser through a third valve unit from the point located at the upstream side of said second valve unit disposed to said third path.