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Investigation of proper modeling of very dense granular flows in the recirculation system of CFBs

Particuology 2012年第6期10卷 699-709页

作者： Aristeidis Nikolopoulos Nikos Nikolopoulos Nikos Varveris sotirios karellas Panagiotis Grammelis Emmanuel Kakaras Laboratory of Steam Boilers and Thermal Plants Thermal Engineering SectorSchool of Mechanical EngineeringNTUAAthensGreece Centre for Research and Technology Hellas Institute for Solid Fuels Technology and ApplicationsAthens Gr-15310Greece

The aim of this paper is the development of new models and] or the improvement of existing numerical models, used for simulating granular flow in CFB （circulating fluidized bed） recirculation systems. Most recent models follow the TFM （two-fluid model） methodology, but they cannot effectively simulate the inter-particle friction forces in the recirculation system, because the respective stress tensor does not incorporate compressibility of flow due to change of effective particle density. As a consequence, the induced normal and shear stresses are not modeled appropriately during the flow of the granular phase in the CFB recirculation system. The failure of conventional models, such as that of yon MisesJCoulomb, is mainly caused by false approximation of the yield criterion which is not applicable to the CFB recirculation system. The present work adopts an alternative yield function, used for the first time in TFM Eulerian modeling. The proposed model is based on the Pitman-Schaeffer-Gray-Stiles yield criterion. Both the temporal deformation of the solid granular phase and the repose angle that the granular phase forms are more accurately simulated by this model. The numerical results of the proposed model agree well with experimental data, implying that frictional forces are efficiently simulated by the new model.

关键词： Euler-EulerCFBRepose angleFull-loop simulationGranular viscosityYield criterion

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