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- W1966684443 abstract "Abstract The design and operation of power plants that use waste, thermally exploitable waste products and biomass as fuels are considered difficult because there are substantial fluctuations in the fuel composition and the resulting energy content. In addition, deposits often occur on steam generator walls. These deposits hinder heat transfer, reducing steam generator performance, and generally promote corrosion. The detailed properties of these deposits during plant operation are unknown. To implement improved cleaning processes, for example those using water cannons, methods for in-situ analysis of the deposits are required. The temperature field and heat flux density distribution in the membrane wall are dependent on the material density, the specific heat capacity, and the thermal conductivity as well as on the heat transfer conditions between the flue gas and the membrane wall. The presence of deposits on membrane walls damps temperature fluctuations, and there is a phase shift of the signal that depends on the properties of the deposit materials. This allows a method for the online signal analysis of heat flux density and temperature signals. In the future, this method could be used to help obtain information on the type of deposits, the deposit thickness, and the corrosion potential as well as other properties to optimize cleaning. This study describes the first investigative step in which the properties (deposit thickness, thermal conductivity, and thermal diffusivity) of two model deposits were identified using a mathematical model. The results of this model are validated with experimentally obtained data. The initial investigations were performed using harmonic oscillations to simplify the naturally occurring stochastic fluctuations, which are difficult to describe mathematically. Further development of this method will be aimed at expanding it to cover non-periodic temperature fluctuations using signal analysis methods and the application of the measurement and analysis procedure in practice." @default.
- W1966684443 created "2016-06-24" @default.
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- W1966684443 date "2013-10-01" @default.
- W1966684443 modified "2023-09-27" @default.
- W1966684443 title "In-situ analysis of deposit properties in steam generators" @default.
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- W1966684443 doi "https://doi.org/10.1016/j.ijthermalsci.2013.05.006" @default.
- W1966684443 hasPublicationYear "2013" @default.
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