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US 4,145,995 AGranted
Method of operating a power plant and apparatus therefor
AssigneeHitachi, Ltd.
InventorShunji Kato
Life of this patent
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AssigneeHitachi, Ltd.
InventorShunji Kato
Estimating the term…
In the control of the operation of a power plant including a gas turbine power generating unit, a main boiler whose heat source is exhaust gas of the gas turbine and which supplies steam to a heat load, a back-up boiler which has an independent fuel system and which is operated to supply steam to the heat load when the quantity of supply of steam of the main boiler to the load is insufficient, and a heat exchanger which is disposed in a boiler feeding system common to the main boiler and the back-up boiler and which receives excess steam or condensed water as discharged from the heat load and heats feed water, a method of operating a power plant and apparatus therefor comprising a circulating pipe for connecting a steam generating portion of the back-up boiler and the heat exchanger and for causing boiler feed water to flow from the back-up boiler back to the heat exchanger even during shutdown of the back-up boiler, and valve means disposed in the circulating pipe and adapted to be shut when a condition of the generating steam of the main boiler for the heat load is insufficient and when the back-up boiler is operated, whereby the temperature of the steam generating portion of the back-up boiler is held at above a predetermined temperature even during the shutdown of the back-up boiler.
In a method of controlling the operation of a power plant including a gas turbine power generating unit, a main boiler whose heat source is exhaust gas of the gas turbine and which supplies steam to a heat load, a back-up boiler which has an independent fuel system and which supplies steam to the heat load only when the condition of the steam supplied by the main boiler has become insufficient, and a heat exchanger which is disposed in a feeding system common to the main boiler and the back-up boiler and which receives excess steam or condensed water as discharged from the heat load and heats feed water,
In an apparatus for controlling the operation of a power plant including a gas turbine power generating unit, a main boiler whose heat source is exhaust gas of the gas turbine and which supplies steam to a heat load, a back-up boiler which has an independent fuel system and which supplies steam to the heat load only when the condition of the steam supplied from the main boiler has become insufficient, and a heat exchanger which is disposed in a feeding system common to the main boiler and the back-up boiler and which receives excess steam or condensed water as discharged from the heat load and heats feed water,
Dependencies are inferred from the claim text.