To provide a low pressure steam turbine with a moving blade capable of reducing vibrational stress associated with superimposing of random vibration and flashback vibration, in a large low pressure steam turbine.
This low pressure steam turbine has a plurality of paragraphs constituted of a stationary blade and the moving blade, and the moving blade in the paragraph is made in a high damping structure of a head end overall peripheral connecting blade structure, etc. in having air bleed holes of steam for feed water heating of a feed water heater immediately before and after one of the paragraphs. Additionally, a steam flow rate of a low pressure steam turbine inlet is increased by more than about 10% of rating or quantity of hot water in the feed water heater is adjusted when pressure of steam in a steam channel reaching the feed water heater from a periphery of the air bleed hole on the side immediately before the moving blade becomes higher than a specified value.
SENOO SHIGEKI
SEGAWA KIYOSHI
MITANI TATSUO
YAMAGUCHI KAZUYUKI
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