Method for the flexible operation of a power plant
AssigneeSiemens Aktiengesellschaft
InventorsJan Brückner, Gerhard Schlund, Frank Thomas, Bernd Weissenberger
Life of this patent
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Abstract
A method for flexibly operating a nuclear power plant with a waste heat steam generator that operates according to the forced-flow principle and that has heating surfaces of different stages of the waste heat steam generator, the heating surfaces being arranged in the flue gas channel, is provided. In order to increase the output, a mass flow of the feedwater flowing through the heating surfaces is increased while almost simultaneously activating a supplementary firing arranged in the flue gas channel of the waste heat steam generator.
Claims8
A method for the flexible operation of a power plant, the power plant including a waste heat steam generator that works according to a once-through principle and has a plurality of heating surfaces of various stages of the waste heat steam generator arranged in a flue gas duct, the method comprising:
- increasing power of the power plant by using an additional firing power controller controlling an additional firing within the flue gas duct at approximately the same time as a mass flow rate of a feed water flowing through the plurality of heating surfaces is increased by controlling a feed water quantity controller controlling a feed water pump, the additional firing power controller and the feed water quantity controller both being controlled and monitored by a central control system, wherein the additional firing is located at a flue gas entry side of the flue gas duct;
- wherein the feed water flows in a feed water direction towards the flue gas entry side of the flue gas duct starting proximate a flue gas exit side of the flue gas duct through the plurality of heating surfaces a single time according to the once-through principle;
- wherein a flue gas flows from the flue gas entry side of the flue gas duct and around the plurality of heating surfaces, such that the flue gas first passes around one or more superheater stages, then around one or more evaporator stages, and then around one or more preheater stages, in a flow direction opposite to a flow direction of the feed water.
A method for flexible operation of a power plant having a waste heat steam generator that works according to a once-through principle, the waste heat steam generator including a plurality of heating surfaces of various stages of the waste heat steam generator arranged in a flue gas duct, the method comprising:
- switching on an additional firing that is arranged in the flue gas duct;
- and
- increasing a mass flow rate of a feed water flowing through the plurality of heating surfaces by controlling a feed water quantity controller controlling a feed water pump when the additional firing is switched on using an additional firing power controller controlling to increase a steam mass flow rate that:
- actively controls a cooling of one or more superheater heating surfaces of the plurality of heating surfaces within the flue gas duct, and
- generates a larger quantity of steam to be delivered;
- wherein the feed water flows in a feed water direction towards a flue gas entry side of the flue gas duct starting proximate a flue gas exit side of the flue gas duct through the plurality of heating surfaces a single time according to the once-through principle;
- wherein a flue gas flows from the flue gas entry side of the flue gas duct and around the plurality of heating surfaces, such that the flue gas first passes around one or more superheater stages, then around one or more evaporator stages, and then around one or more preheater stages, in a flow direction opposite to a flow direction of the feed water;
- the additional firing power controller and the feed water quantity controller both being controlled and monitored by a central control system.
Dependencies are inferred from the claim text.