GAS TURBINE, GAS TURBINE CONTROL DEVICE, AND GAS TURBINE COOLING METHOD

摘要

A gas turbine includes a cooling air supply passage which supplies compressed air bled from a compressor to a disk cavity of a turbine, a cooler side valve in the cooling air supply passage, a temperature measurement unit which measures ambient temperature of the disk cavity, and a control device which adjusts an opening degree of the cooler side valve based on the ambient temperature measured by the temperature measurement unit. The control device includes a first valve opening degree setting value and a second valve opening degree setting value larger than the first valve opening degree setting value of the cooler side valve, the first valve opening degree setting value is used when the ambient temperature is lower than a predetermined switching temperature, and the second valve opening degree setting value is used when the ambient temperature is higher than the switching temperature.

主权项

1. A gas turbine comprising:
a compressor which compresses air; a combustor which burns a mixture of a fuel and the air compressed by the compressor; a turbine which obtains rotational power by a combustion gas generated by the combustor; a cooling air supply passage which supplies air bled from the compressor to a disk cavity of the turbine; an opening/closing valve which is provided in the cooling air supply passage; a temperature measurement unit which measures an ambient temperature of the disk cavity; and wherein the control device includes a first valve opening degree setting value and a second valve opening degree setting value larger than the first valve opening degree setting value of the opening/closing valve, and the second valve opening degree setting value is used when the ambient temperature is higher than the second switching temperature and the first valve opening degree setting value is used when the ambient temperature is lower than the first switching temperature.