| 摘要 |
PURPOSE:To decrease thermal stress of a rotor, by warming up the front stages group of a high pressure turbine and keeping the rear stages group of this high pressure turbine to be vacuum, during the start of an intermediate pressure turbine, in the starting method for a reheat turbine, which is constituted as starting the high pressure turbine after starting the intermediate pressure turbine. CONSTITUTION:At the start of a turbine, steam is fed from a steam pipe 28 into the steam chamber 29 of an intermediate pressure turbine 50, and most of this steam is led out to a low pressure turbine through a connecting pipe 51, as being expanded in the stages of the intermediate pressure turbine. On the other hand, a part of the steam is led into a steam chamber 41 through such as a space between the stationary blade 210 at the first stage of the intermediate pressure turbine and a packing case 40, and sent to a warming up steam valve 75 through routes 101-104. Then, this steam is led to the first stage 10a of a high pressure turbine 10 through routes 74-70, so as to perform warming up by this steam, and after that, this steam is exhausted to a condensate route through a ventilator valve 85 and a steam pipe 87. At this time, the inside of the high pressure turbine 10 is kept vacuum, and flowing of the outside air into this turbine 10 is prevented by labyrinth packings 303a-303c.
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