Liquid heaters and vaporizers – Automatic control of fluid fuel and water
Reexamination Certificate
2005-09-06
2005-09-06
Wilson, Gregory (Department: 3749)
Liquid heaters and vaporizers
Automatic control of fluid fuel and water
C122S45100R, C376S207000
Reexamination Certificate
active
06938584
ABSTRACT:
A feedwater control system considering a pressure drop of feedwater control valve in a nuclear power plant and a control method therefor are provided. In the feedwater control system, a first detection unit includes: a flow error signal generator for generating a flow error signal corresponding to a difference between a steam flow signal and a feedwater flow signal; and a water level correction error signal generator for generating a water level correction error signal corresponding to a sum of a water level measurement signal and the flow error signal. A second detection unit includes: a pressure drop sensor unit for detecting a pressure difference between front and rear portions of at least one feedwater control valve among the main feedwater control valves and the downcorner feedwater control valves and generating a pressure drop signal corresponding to the detected pressure difference; a pressure drop setup value signal generator for generating a pressure drop setup value signal corresponding to a previously set pressure drop setup value of the feedwater control valves; and a pressure drop error signal generator for comparing the pressure drop signal with the pressure drop setup value signal and generating a pressure drop error signal. A control unit controls the main feedwater pump based on a correction control signal output from the correction control signal generator.
REFERENCES:
patent: 4074360 (1978-02-01), Stadie et al.
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patent: 5287390 (1994-02-01), Scarola et al.
patent: 6055945 (2000-05-01), Simoni
Seo Jong Tae
Sohn Jong Joo
Sohn Suk Whun
Song In Ho
Korea Power Engineering Company, Inc.
Nixon & Vanderhye P.C.
Wilson Gregory
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