Method for operating a stationary gas turbine with a low-calorific or medium-calorific fuel and stationary gas turbine for same

The method involves supplying low calorific fuel and medium calorific fuel e.g. synthesis gas to a gas turbine (10). The gas turbine is provided with a secondary-air system with two cool air stages (44d,44c) to perform refrigeration of turbine components. The fuel is burnt with compressed air and cooling air is supplied from cool air stages at same pressure during identification and partial load operation of the gas turbine. An independent claim is included for stationary gas turbine.