| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a blade surface corrosion prevention means which does not lower a turbine output and operating efficiency and does not produce an extra machining cost in the final stage blade cascade of a condensate type steam turbine. <P>SOLUTION: In the low-pressure turbine casing 12 of the condensate type steam turbine 10, an annular pocket 36 is formed in a blade ring 24 positioned on the outside of a final stage stationary blade 28c, and a dry steam introduction pipe 38 and outlet pipes 42a-42c are connected to the annular pocket 36. A hot dry steam ds extracted from a high-pressure turbine casing is introduced into the annular pocket 36 through the dry steam introduction pipe 38. The root side area 29c of the final stage stationary blade 28c is heated to heat and evaporate the droplets flowing toward the distal end area 21c of a final stage moving blade 20c through the root side area 29c for pulverization. Consequently, the distal end area 21c of the final stage moving blade 20c is prevented from being corroded. <P>COPYRIGHT: (C)2012,JPO&INPIT |
