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Heat Transfer Effects in Fluidized Bed Grain Drying Quality

Publication Date : 11/07/2015

Author(s) :

P.K.Wankhade , Dr. R.S.Sapakal , Dr. V.S.Sapkal.

Conference Name :
4th International Conference on Recent Trends in Engineering & Technology(ICRTET-2015) July 2-4,2015 Organized by SNJB's KBJ College of Engineering,Chandwad,Nashik,Maharashtra,India

Abstract :

Drying of agricultural grains, seeds is widely used to prevent biodegradation and for further processing. Fluidized bed technology is one of the most effective means for the interaction between solid and gas flow, mainly due to its good mixing and high heat and mass transfer rate. When applied to drying of non-porous moist solid particles, the water is drawn-off driven by the difference in water concentration between the solid phase and the fluidizing gas. The use of a fluidized bed dryer with a lateral air flow and mechanical activity to the drying of some selected grains was investigated. The drying rates curves in terms of moisture content versus drying time for moth beans and soybeans were obtained experimentally using a fluidized bed, the drying rates were found to be dependent on the inlet air temperature and velocity. The effects of heat and mass transfer parameters on the efficiency of fluidized bed drying have been studied to optimize the input and output conditions. The analysis was carried out using two different materials, soybean and moth beans. The objective of this study was to examine the effects of the fluidized-bed drying method on the final quality on various grains. Experimental curves of moisture content vs. drying time, as well as drying rate and the size characteristics of the products, were determined at temperatures between 40°C and 90°C, and air velocity of 0.5m/s – 1.5m/ for moisture content 45-58 % (db) to about 20-26 %(db).

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