F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
60/47
F01D 17/00 (2006.01) F01K 13/02 (2006.01)
Patent
CA 1096184
17/6 METHOD AND SYSTEM FOR EFFECTING CONTROL GOVERNING OF A STEAM TURBINE ABSTRACT OF THE DISCLOSURE A method and system for effecting control governing of a steam turbine wherein the steam chamber of a first stage nozzle is divided into a plurality of steam compartments, control valves each connected to one of the steam compartments are individually operated for controlling the flow rate of steam introduced into the turbine, and the governing of the nozzle is effected by adjusting the flow rate of steam in accordance with a load. At low load, the degree of opening of the control valves is kept constant and the turbine is driven by steam of a reduced pressure by reducing the pressure of the steam at the inlet of the turbine so as to maintain, in a low load region, the volume flow rate of steam for a high load region. To cope with a change in the value of the load, the degree of opening corresponding to a predetermined change in the value of the load is set beforehand for each control valve. When the change in the value of the load is smaller than the predetermined change in the value of the load, the degree of opening of the control valve involved is adjusted. Conversely, when the change in the value of the load is greater than the predetermined change in the value of the load, the pres- sure of the steam at the inlet of the turbine is controlled.
296920
Hisano Katsukuni
Kunio Tsuji
Nakamura Shozo
Sakai Akira
Hitachi Ltd.
Kirby Eades Gale Baker
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