Patent attributes
A gas turbine is equipped with: a low-pressure bleed passage, a medium-pressure bleed passage, and a high-pressure bleed-passage for supplying compressed air bled from respective bleed chambers to a turbine; a low-pressure exhaust passage, a medium-pressure exhaust passage, and a high-pressure exhaust passage for exhausting the compressed air in the respective bleed passages to an exhaust chamber; a low-pressure exhaust valve, a medium-pressure exhaust valve, and a high-pressure exhaust valve provided respectively in the exhaust passages; a low-pressure ejector and a medium-pressure ejector provided in the respective exhaust passages; a driving air supply passage for supplying the compressed air to the ejectors; and a control device configured to open the exhaust valves and supply compressed air from the driving air supply passage to the ejectors when an operating state of a gas turbine is in a region in which rotation stall is generated.
