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- W2070176707 abstract "A one-dimensional model has been derived for gas-particle contacting in circulating fluidized bed risers. The aim of the modelling effort is to predict the total degree of heterogeneous conversion attainable in CFB risers, not to predict cross-sectional gradients or properties. The model is based on a single, freely moving particle approach taking into account external as well as internal transport limitations. The model also includes a correction function to take particle clustering effects into account in a simplified way. The bottom bed is treated in a very simplified way so that a total bypass flow is computed by a correlation function. For the remainder of the riser, except for the splash zone, a core-annulus structure is assumed. The model takes into account different types of particles and may therefore be used to estimate the efficiency of, for example, limestone injection for sulphur retention in a coal-fired unit where sand is the bed material. The model also includes the option to predict probability distributions for the number of contacts between a gas package and particles of different types and thus to estimate the contacting time. This is useful to predict conversion rates in catalytic applications. The model is compared to experimental data from literature and shows reasonable agreement over a wide range of operating conditions." @default.
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- W2070176707 date "1996-08-01" @default.
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- W2070176707 title "A theoretical model for gas-particle contact efficiency in circulating fluid bed risers" @default.
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- W2070176707 doi "https://doi.org/10.1016/0032-5910(96)03121-x" @default.
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