CONTROL DEVICE FOR COMBINED CYCLE PLANT

Japanese Patent JPS5946306

A

PURPOSE:To prevent the high pressure steam turbine from a steam counterflow by a method wherein the steam condition supplied from a low pressure steam line is controlled to correspond with the discharged steam condition blown down from a high pressure steam turbine to a pressure mixing part, in the pressure mixing part of a steam turbine. CONSTITUTION:An output power of a pressure detector 25 which detects a upper side steam pressure of a high pressure steam control valve 15 for a high pressure steam turbine 5, a high pressure steam flow rate signal 30 measured by a high pressure orifice 13 and an output power from a valve lift detector 26 of the high pressure steam control valve 15 are simultaneously inputted to a calculator 29 which calculates the discharged steam pressure of the high pressure steam turbine 5. On the other hand, a calculator 31 calculates, in the same manner, the downstream side steam pressure of a low pressure steam control valve 19 due to the three kinds of output signals. Then, the two outputs from the calculator 29 and the calculator 31 are inputted to an adding machine 33, the adding machine 33 outputs a deviation signal of the downstream side steam pressure of the low pressure steam control valve 19 against the discharged steam pressure. The deviation signal is compared with an output signal from a valve lift detector 28 in a claculator 34. Then, the difference signal acts as an operation signal and the low steam control valve 19 is opened or closed as said difference signal cancels the output signal from the adding machine 33.

SHINDOU KURA

JP15696082A

March 15, 1984

September 09, 1982

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TOKYO SHIBAURA ELECTRIC CO

F01K7/20; F01K23/10; (IPC1-7): F01K23/10

Kiyoshi Inomata

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