STEAM TURBINE PLANT AND COOLING METHOD OF STEAM TURBINE PLANT

摘要

PROBLEM TO BE SOLVED: To prevent decline in thermal efficiency caused by intermixture of low-temperature steam with high-temperature steam from outside in the radial direction of a gap between diaphragm outer rings adjacent to each other toward inside. SOLUTION: A seal device 541for cooling steam is provided in the gap G between the adjacent diaphragm outer rings 39U, 39D. This constitution prevents cooling steam 51 passing a communication groove 52 formed in a fitted and fixed part of an inner casing 32 and diaphragm outer rings 39 from being mixed with drive reheating steam of an intermediate pressure turbine 3-2. COPYRIGHT: (C)2006,JPO&NCIPI