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- W1498757922 abstract "The broad features of fluidized bed combustors (FBC's) are markedly different from fluidized beds of the more traditional type, such as fluidized bed catalytic reactors (FBR's). Thus, the two types operate in distinct fluid dynamics regimes; i.e., the FBR's in a fast bubble regime and the FPC's in a slow bubble regime if there are bubbles at all. Similarly, in heat transfer, while the FBR will operate in a regime where the hot solid particles are expected to change in temperature substantially during a heat transfer process, the FBC will operate in a regime where the solid particles remain nearly isothermal. In the latter case, for a given fractional time of exposure to bubbles, the rate of heat transfer is independent of the bubble frequency. These differences are attributable to the relatively larger solid particles (e.g., 1 mm diameter) being used in an FBC as contrasted to the FBR. An important and unique feature of an FBC, which further sets it apart from an FBR, has been uncovered. In an FBR where gas solid reaction occurs, the diffusional rate of reactant gas from the bubble phase to the emulsion phase is usually an important factor in determining the overall reactionmore » rate. In contrast, in an FBC where larger size bed materials are used, the bed in most instances appears to operate in a different regime, where this interphase (i.e., between bubble phase and the emulsion phase) diffusional resistance is either negligible or relatively insignificant. This preliminary conclusion is deduced from the carbon-loading computation using our zero-order model, and illustrates that ''modeling'', among its other functions, may serve as a powerful tool to define the important characteristics of an FBC system.« less" @default.
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- W1498757922 date "1977-02-01" @default.
- W1498757922 modified "2023-09-24" @default.
- W1498757922 title "Modeling of fluidized bed combustion of coal. Quarterly technical progress report (No. 3), November 1, 1976--January 31, 1977. [Comparison of processes in combustors and other reactors]" @default.
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