F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
341/38.1
F01D 21/12 (2006.01) F01D 19/02 (2006.01) F01K 7/16 (2006.01)
Patent
CA 1119696
ABSTRACT OF THE DISCLOSURE The present stress in the turbine rotor is estimated at each control period, from the steam tempera- ture and pressure at the turbine inlet. In addition, the future turbine inlet steam temperature or pressure is preestimated once every nT control cycles, for a given speed or load changing rate, making use of data concerning the changing rate of the turbine steam inlet temperature or pressure in relation with the change of the speed or load, which has been obtained by a learning of the past turbine operating condition. This future steam temperature or pressure at the turbine inlet is used as a factor for preestimating the future stress expected to be caused in the turbine rotor. The preestimation of the rotor stress is performed for a plurality of assumed speed or load chang- ing rates. The turbine is controlled at the maximum speed increase-rate or load changing rate which would not cause the future stress preestimated over a given preestimation time to exceed a limit stress. An observation of the present stress is made at each control period to check whether the limit stress is not exceeded by the present stress.
308308
Fukushima Koichiro
Higashi Toshihiko
Hisano Katsukuni
Kashiwahara Katsuto
Kato Fumio
Hitachi Ltd.
Kirby Eades Gale Baker
LandOfFree
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