F - Mech Eng,Light,Heat,Weapons – 01 – K
Patent
F - Mech Eng,Light,Heat,Weapons
01
K
60/47, 322/6.4
F01K 13/02 (2006.01) F01D 17/18 (2006.01) F22B 35/06 (2006.01) G05B 15/00 (2006.01)
Patent
CA 1105082
47,769 AN EFFICIENT VALVE POSITION CONTROLLER FOR USE IN A STEAM TURBINE POWER PLANT ABSTRACT OF THE DISCLOSURE An efficient valve position controller adapted for use in a steam turbine power plant for efficiently positioning a plurality of steam admission valves to substantially effect a desired power generation level is disclosed. The power plant includes a boiler for generating steam to the turbine at a boiler throttle pressure that is governed by a pressure set point; a valve control means which is governed by a reference signal corresponding to the desired power generation level to position the plurality of steam admission valves in a state according to a predetermined valve posi- tioning pattern based on the value of the reference signal; and an electrical generator driven by the steam turbine to generate electrical energy. A plurality of values of the reference signal are predetermined as being related to efficient valve position states for regulating steam admission to the turbine. The controller adjusts the pressure set point at a desired rate and in a direction as determined by the difference between a selected one of the predetermined values and a present value of the reference signal. Accord- ingly, the reference signal is modulated as a function of the pressure set point adjustment until the reference signal is substantially equal to the selected value at which time the reference signal is governing the valves substantially at an efficient valve position state and further pressure set point adjustment is inhibited. In addition, when the reference signal becomes equal to a predetermined threshold -1- 47,769 value which is indicative of the steam admission valves being substantially wide open, the pressure set point is adjusted to a preset value.
315560
Binstock Morton H.
Johnson Steven J.
Mcconnell And Fox
Westinghouse Electric Corporation
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