2 TWO-SHAFT GAS TURBINE AND METHOD OF CONTROLLING OPENING DEGREE OF INLET GUIDE VANE OF THE SAME

摘要

Even a two-shaft gas turbine constituted by a gas generator and a low-pressure turbine is intended to suppress deterioration of compressor performance at low temperatures. In order to solve the above problem, the two-shaft type gas turbine of the present invention is a two-shaft type gas turbine in which the amount of inflow air to the compressor is controlled by controlling the opening degree of an inlet air guide provided on the air introduction side, A first control unit for adjusting the opening degree of the inlet vane so as to keep the actual rotational speed of the high-pressure turbine shaft at a constant level during high-speed rotation of the high-pressure turbine shaft; A control state confirming unit for confirming an opening degree of the inlet vane, a second state determining unit for determining whether the actual rotational speed to be kept constant in the first control unit input to the control state verifying unit is equal to or larger than a predetermined threshold value N0, Is equal to or greater than a threshold value? 0, and furthermore, when the atmospheric temperature is equal to or lower than a predetermined threshold value Ta0, Correcting low to reduce the rotational speed and air temperature portion characterized in that provided at least.