Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1988-07-11
1989-04-11
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60657, F01K 1302
Patent
active
048194352
ABSTRACT:
A steam turbine power generation generation system includes a partial-arc stem turbine connected in driving relationship to an electric power generator and a boiler system for supplying steam at a predetermined pressure and temperature to the turbine. The boiler system includes a primary superheater, a serially connected division valve for controlling steam flow and pressure and a finish superheater. The turbine system includes a plurality of control valves for controlling steam admission to each partial-arc and a microcomputer base control means for controlling operation of the control valves and the division valve in response to load demands on the system so as to maintain constant speed operation of the steam turbine. The control means provides control signals to the division valve and the control valves for synchronizing operation of the division valve with sequential closing of each of the control valves with the division valve being operated to reduce steam pressure for effecting a reduction in steam flow in accordance with an optimum heat rate for an existing arc of steam admission. Each control valve is operated to modify the arc of admission with constant steam pressure when such modification provides a better heat rate than sliding pressure using the division valve.
REFERENCES:
patent: 4178762 (1979-12-01), Binstock et al.
patent: 4280060 (1981-07-01), Kure-Jensen et al.
patent: 4297848 (1981-11-01), Silvestri et al.
G. W. Bouton, et al.; "Ten Years Experience with Large Pulverized Coal-Fired Boilers for Utility Service"; Apr. 26-28, pp. 19-21.
L. G. Crispin, et al.; "Jacksonville Electric Authority's Conversion of a Subcritical Once-Through Unit to Variable Pressure Cycling Duty"; pp. 1-7.
Ostrager Allen M.
Westinghouse Electric Corp.
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