| 摘要 |
PURPOSE:To efficiently cool a turbine blade implanting part by providing a blade in the first stage and both a nozzle and a blade in the second stage and thereafter with a partition that separates each steam passage in the radial direction and supplying cooling steam through the inner flow passage while supplying principal steam through the outer passage respectively. CONSTITUTION:Principal steam of high temperature FH flows into an upper part nozzle box 3a via a principal steam feeding pipe 11, flows in a flow passage on the tip side (outward in the radial directin) with respect to a partition 15a in a flow passage of a blade 6 in the first stage via a principal steam nozzle 4a, and then flows into a nozzle 13 in the second stage, while giving turning effort to a rotor 2. On the other hand, cooling steam FC flows into a lower part nozzle box 3b via a cooling steam feeding pipe 12 and flows out into a flow passage on the root side with respect to the partition 15a in the flow passage of the blade 6 in the first stage via a cooling steam nozzle 4b. With this contrivance, both the implanting part of the blade 6 and the rotor 2 are brought into contact with the cooling steam FC that is lower in temperature than the principal steam FH so that they can be cooled efficiently. |
