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AssigneeGeneral Electric Company
InventorsLloyd H. Johnson, Robert S. Couchman, Robert C. Spencer, Jr., John A. Booth, Russell J. Holman
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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.
A method of operating a steam turbine delivering power to a connected load and adapted to receive steam from a steam generating source, the turbine having a plurality of control valves for controlling the admission of steam to higher pressure stages of the turbine and having a bypass overload valve connected to receive steam from the steam source and to discharge such steam to a power pressure stage of the turbine, said method comprising the steps of:
In combination with a steam turbine delivering power to a connected load and adapted to receive steam from a steam generating source, the turbine having a plurality of control valves for controlling the admission of steam to higher pressure stages of the turbine, apparatus for operating the turbine at elevated power loads comprising:
Dependencies are inferred from the claim text.