| 摘要 |
A super steam turbine ( 100 ) into which high-temperature steam of 650° C. or more is introduced is provided with an inner steam pipe ( 120 ) which is disposed through an inner casing ( 110 ) and an outer casing ( 111 ), an outer steam pipe ( 130 ) which is welded to the outer casing ( 111 ) and disposed outside of the inner steam pipe ( 120 ) along the inner steam pipe ( 120 ) with a prescribed space therebetween, and a radiation heat shielding pipe ( 140 ) which is disposed along the inner steam pipe ( 120 ) between the inner steam pipe ( 120 ) and the outer steam pipe ( 130 ) to face a welded portion of at least the outer steam pipe ( 130 ), wherein cooling steam ( 160 ) is flown between the inner steam pipe ( 120 ) and the outer steam pipe ( 130 ), respective component parts are made of a suitable heat-resisting steel having prescribed chemical composition ranges.
|
