Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1981-11-02
1983-09-13
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60662, 60677, F01K 1302
Patent
active
044034768
ABSTRACT:
A method is disclosed for operating a steam turbine using turbine reserve capacity for attaining operation at elevated loads. In a preferred form of the invention, a bypass overload valve is provided in parallel with the steam admission control valves but is connected to discharge steam to a lower pressure stage of the turbine. During operation of the turbine at less than full load, the bypass overload valve is maintained closed and the control valves are positioned to sustain a preselected load. As load on the turbine increases, the control valves are increasingly opened until they have all reached their fully opened position corresponding to a nominal rated capacity of the turbine. Then, at the discretion of operating personnel, the bypass overload valve is fully opened while simultaneously one or more of the control valves is throttled to offset any steam passing through the bypass overload valve in excess of the amount required to sustain the preselected turbine load. A throttling reserve is thus established on the control valves which may then be positioned toward their fully opened position to achieve greater power output.
REFERENCES:
patent: 1798894 (1931-03-01), Noack et al.
patent: 2254424 (1941-09-01), Gleichmann
patent: 4118935 (1978-10-01), Andersson
J. E. Downs et al., "Large Steam Turbine-Generators with Spinning Reverse Capacity", vol. XXII--Preceedings of the American Power Conference, 1960.
Booth John A.
Couchman Robert S.
Holman Russell J.
Johnson Lloyd H.
Spencer, Jr. Robert C.
Ahern John F.
General Electric Company
Husar Stephen F.
Kain, Jr. Robert C.
Ostrager Allen M.
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