Cooling assembly and method for a gas-turbine electric power generating plant and gas-turbine electric power generating plant comprising said cooling assembly

摘要

A cooling assembly (10) for a gas-turbine electric power generating plant (1), equipped with a gas turbine (2) having at least one array (12) of stator blades (13) and with a compressor (3), comprising:- a cooling circuit (28) for cooling the array (12) of stator blades (13) of the gas turbine (2), which comprises at least one manifold (32a, 32b, 32c) and a plurality of conduits (33) connected to the manifold (32a, 32b, 32c) and arranged at least partly inside respective stator blades (13);- a compressed-air extraction circuit (29), which draws at least one flow of compressed air from the compressor (3) and feeds it to the cooling circuit (28);- a cooling fluid feed circuit 30, which is configured to add at least a first flow rate (Q1, Q2, Q3) of cooling fluid to the flow of drawn-off compressed air to cool it, and comprises a control unit (44) configured to calculate the first flow rate (Q1, Q2, Q3) of cooling air on the basis of at least a first parameter (TT) related to a temperature of the gas turbine (2), and on the basis of at least a second parameter (TC, Po, Pi) related to a temperature of the flow of compressed air drawn from the compressor (3) by means of the compressed-air extraction circuit (29).