GAS TURBINE COOLING SYSTEM, GAS TURBINE PLANT EQUIPPED WITH SAME, AND METHOD FOR COOLING HIGH-TEMPERATURE SECTION OF GAS TURBINE

摘要

This gas turbine cooling system (40) is equipped with: an organic Rankine cycle (50) in which a cycle medium (CM) is circulated while being condensed and evaporated repeatedly; an extraction line (41) for extracting compressed air (CA) from a compressor (11) of a gas turbine (10); a cooling device (60) that, by utilizing the heat of the compressed air (CA) that came in through the extraction line (41), heats and evaporates the cycle medium (CM) that has been condensed in the organic Rankine cycle (50) and cools the compressed air (CA) at the same time; and a cooled air line (42) that introduces the compressed air (CA) that has been cooled by the cooling device (60) to a high-temperature section of the gas turbine (10).