Design fabrication and evaluation of a direct-fired corn cob furnace for corn drying
2009
Bitog, J.P.P., Nueva Viscaya State Univ., Bayombong, Nueva Viscaya (Philippines) | Elauria, J.C. | Elepaño, A.R. | Resurreccion, A.N., Philippines Univ. Los Baños, College, Laguna (Philippines) Coll. of Engineering and Agro-Industrial Technology
The performance of a fabricated direct-fired corncob furnace was evaluated to determine best combinations of operating parameters involving fuel feed rate, combustion air, and fuel size. The furnace had the following components: hopper, rotary feeder, variable motor, inclined grate, and horizontal grate. The furnace wall was made up of cement and red volcanic cinder. Result showed no trend from the computed burning efficiency when the fuel feed rate was varied. All the levels of combustion air and fuel size significantly affect the burning efficiency of the furnace. All levels of the independent parameters revealed significant differences in the furnace efficiency. In terms of furnace capacity, all independent parameters revealed no significant differences. Theoretically, the furnace can supply the required energy needed for the two-ton flat bed dryer to dry corn grains from 28% to 12% moisture content for 8 hours of operation. Fuel feed rate of 15 kg/hr with 3,300 cu m/hr combustion air and fuel size 2.5 cm is the best operating condition to operate with the high furnace efficiency. The average computed furnace efficiency for this operating condition is 89%.
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