Heat exchangers and cooling methods for gas turbines

A gas turbine (10) comprising a compressor (20), a combustor (30) downstream of the compressor, a turbine (40) downstream of the combustor, a heat exchanger (70), a first cooling fluid system (50) and a second cooling fluid system (60) is described. The first cooling fluid system and the second cooling fluid system are each configured and arranged to extract a cooling fluid from the compressor and to cool a part of the gas turbine using the cooling fluid. The first cooling fluid system and the second cooling fluid system each extend from the compressor to the heat exchanger and from the heat exchanger to the part of the gas turbine to be cooled. The heat exchanger is configured and arranged to exchange heat from the cooling fluid in the second cooling fluid system to the cooling fluid in the first cooling fluid system. A rotor cover (100) with a heat exchanger and methods of operation are also described. 本发明涉及热交换器和用于燃气涡轮机的冷却方法。描述了种燃气涡轮机（10），其包括压缩机（20）、在压缩机下游的燃烧器（30）、在燃烧器下游的涡轮机（40）、热交换器（70）、第冷却流体系统（50）和第二冷却流体系