Performance evaluation of the Fluidized Ved Dryer for first stage drying of high moisture paddy
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Date
2023
Authors
Graciano T. Sto. Tomas
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Abstract
The fluidized bed dryer for paddy was designed by PhilMech as a two=stage drying system. The dryer served as the first-stage dryer for the immediate removal of free water to a more manageable level of 18-22% moisture content wet basis. The heat source of the dryer can be adapted to diesel or biomass. such as rice hull.
This study was conducted to evaluate the performance of the fluidized bet dryer in first stage drying of high moisture paddy using 2 different heat sources. These experimental rooms using diesel and another three runs using rice hull were made. The performance evaluation was done at Bagong Bahay ng Mabini-Purpose Cooperative. Two tons of high mositure paddy were used in each batch and a total of 6 batch was done.
Drying parameters such as heat utilization, moisture content reduction, heat added to the air, drying efficiency, drying system efficiency, and heating system efficiency were measured, computed and analyzed. Ambientcondition, crop condition and dryer performance were recorded for every test run. The PAES 202-2015 or the Fleated air mechanical dryer test procedure used as the reference for the drying performance test. Results were analyzed using Analysis of Variance (ANOVA) and the comparison among means was done using Tukey's Test. Simple cost analysis for price per kilo (Kg) of wet paddy to be dried at the fluidized bed dryer were also carried out. Based on the performance evaluation made on the fluidized bed dryer, it resulted to a measured drying condition for the developed fluidized bed dryer was at temperature of 70°C with an air velocity of 9m/s and static pressure of 3.5 in H2O.
The fluidized bed dryer resulted to a high drying system efficiency when diesel burner is used as a heating system.
The drying parameters such as heat utilization, drying efficiency, drying system efficiency, heating system efficiency and drying time are are significantly affected by the fuel used in heating system. in terms of fuel used, the use of rice hull furnace resulted to a higher fuel consumption compared to the use of diesel burner as heating system. Using simple cost analysis on using diesel burner heating system in the fluidized bed dryer will incur a total of Php 0.83 to dry a kilogram of paddy, on the other hand, using a rice hull furnace resulted to lower drying cost of Php 0.74 kilogram of paddy.