Patent ID: 9085993
Filing Date: 2015-07-21
Classification: F01D,F05D

Abstract:
1. A cooling method of cooling a dummy ring and a rotor surrounded by the dummy ring of a single-flow high pressure turbine which is integrated in a steam turbine generator facility and into which steam of high temperature is introduced, the method comprising: supplying cooling steam generated in the steam turbine generator facility to a cooling steam supply path arranged in the dummy ring, the cooling steam having lower temperature and higher pressure than leak steam which is a portion of main steam supplied to a nozzle chamber of the single-flow high pressure turbine and leaks to the dummy ring side; and cooling the dummy ring and the rotor by introducing the cooling steam to a clearance formed between the dummy ring and the rotor via the cooling steam supply path and forcing the cooling steam to flow in the clearance against the leak steam, wherein the rotor has a first rotor part made of heat resistant material and a second rotor part made of heat resistant material having heat resistance lower than the first rotor part and connected to the first rotor part at a connection part, wherein the cooling steam supply path has a part extending through the dummy ring adjacent to the nozzle chamber and an opening which is formed on an inner periphery of the dummy ring adjacent to the nozzle chamber facing the rotor and which opens to the clearance, wherein the inner periphery of the dummy ring has wherein a labyrinth seal is provided in each of a clearance between the first region of the inner periphery of the dummy ring and the rotor and a clearance between the second region of the inner periphery of the dummy ring and the rotor, and wherein a part of the rotor includes the connection part and is surrounded by the second region of the inner periphery of the dummy ring, and wherein said cooling operation includes cooling the connection part of the rotor.