Abstract
India has abundance of biomass such as rice husk, bagasse, wheat straw, sawdust etc. which is used as a main or auxiliary fuel in the fluidized bed combustor, gasifier and pyrolizer. Design of such fluidized bed equipments require the knowledge of minimum fluidization velocity (Umf), complete fluidization velocity (Ucf) and transport disengagement height (TDH). The present work reports the fluidization characteristic, Umf, Ucf and TDH of the individual size groups of sawdust and mixture thereof. The results indicate that the Umf and Ucf have a tendency to increase with increase in particle diameter, however the TDH shows the reverse trend. The sawdust particle size of 925 and 1200 μm showed significant difference between their Umf and Ucf, an essential parameter for controlled fluidization. Based on the experimental work new correlations for the prediction of Umf, Ucf and TDH for sawdust sample are proposed. The proposed correlations of Umf, Ucf and TDH are in good agreement with experimental values and the deviations found within the range of nearly ±10% for all the samples.
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