Combined cycle power plant
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsHIROYUKI YAMAMOTO, HIDEO KIMURA
Life of this patent
Estimating the term…
Abstract
A combined cycle power plant is disclosed, which has a backup function operating during the normal operation as well as when the plant is activated, so as to reliably maintain the steam cooling operation when an abnormal phenomenon occurs. In this power plant, the cool steam of the steam cooling system for cooling a high-temperature portion of the gas turbine is the high-pressure exhaust gas of the high-pressure turbine. When the exhaust gas is unexpectedly insufficient, high or medium-pressure steam output from the exhaust heat recovery boiler is introduced as cool steam into the steam cooling system, thereby reliably continuing the steam cooling operation.
Claims2
A combined cycle power plant having a gas turbine plant and a steam turbine plant combined together, the power plant comprising:
- an exhaust heat recovery boiler for generating steam for driving the steam turbine by using exhaust heat from the gas turbine;
- and
- a steam cooling system for cooling a target high-temperature portion in the gas turbine by using steam, where superheated steam from the steam cooling system is recovered and used in the steam turbine, and
- wherein the steam turbine plant comprises at least a high-pressure turbine and a low-pressure turbine, wherein an exhaust gas from the high-pressure turbine is introduced into the steam cooling system, and when the exhaust gas from the high-pressure turbine is unexpectedly insufficient, high or medium-pressure steam output from the exhaust heat recovery boiler is introduced into the steam cooling system.
Dependencies are inferred from the claim text.