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AssigneeSiemens Energy Global GmbH & Co. KG
InventorsJan Brückner, Tobias Schulze, Frank Thomas
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A method for operating a forced-flow steam generator constructed as a waste-heat steam generator having a pre-heater, including pre-heater heating surfaces, and having an evaporator including evaporator heating surfaces connected downstream on the flow medium side of the pre-heater heating surfaces. A device for adjusting a feed water mass flow has a set point for the feed water mass flow. During the creation of the set point for the feed water mass flow, a waste-heat flow transferred to a fluid in the evaporator heating surfaces is determined, and mass storage and energy storage in the fluid in the evaporator heating surfaces is detected during non-steady-state plant operation. A behaviour over time of a mass storage in the evaporator is coupled with a behaviour over time of a mass storage in the pre-heater, wherein scaling is carried out with a ratio of the density changes in the evaporator and pre-heater.
A method for operating a once-through steam generator designed as a waste-heat steam generator, with a pre-heater, comprising a number of pre-heater heating surfaces, and with an evaporator, comprising a number of evaporator heating surfaces connected downstream on the flow medium side of the pre-heater heating surfaces, the method comprising:
Dependencies are inferred from the claim text.