TURBINE COOLING APPARATUS

摘要

A turbine cooling apparatus of an embodiment includes a cooling air supply unit and a control unit The control unit controls an operation of the cooling air supply unit during a turning operation. Here, the control unit controls the operation of the cooling air supply unit to make the cooling air supply unit supply the cooling air at a previously determined flow rate. Thereafter, the control unit controls the operation of the cooling air supply unit based on at least either of a result obtained by measuring differential expansion between a turbine rotor and a turbine casing, and a result obtained by measuring a temperature difference between an inner peripheral surface of a steam chamber positioned at an entrance of a steam flow path through which steam flows in the turbine casing and an outer peripheral surface of the steam chamber.

主权项

1. A turbine cooling apparatus for cooling a steam turbine having a turbine casing and a turbine rotor housed in an inner part of the turbine casing, the turbine cooling apparatus comprising:
a cooling air supply unit configured to supply cooling air to the inner part of the turbine casing; and a control unit configured to control an operation of the cooling air supply unit during a turning operation, wherein the control unit controls the operation of the cooling air supply unit to make the cooling air supply unit supply the cooling air at a previously determined flow rate, and then controls the operation of the cooling air supply unit based on at least either of a result obtained by measuring differential expansion between the turbine rotor and the turbine casing, and a result obtained by measuring a temperature difference between an inner peripheral surface of a steam chamber positioned at an entrance of a steam flow path through which steam flows in the turbine casing and an outer peripheral surface of the steam chamber.