Rice husk furnace for grain dryer
Why do we use rice husk for grain dryer furnaces?
Rice husk is cheap and lowers drying cost, thus making mechanical drying competitive. As a waste of the rice milling process, the cost of acquiring rice husk is practically its transportation cost to the dryer.
In Vietnam, 2.5 kg of rice husk yields the same heat quantity of 1 kg of good-grade coal, but the former costs only 1/7 that of the latter.
What are the types of rice husk furnace?
Two furnace designs are shown below, both with inclined grates. The box-type furnace does not do as good a job of settling ashes as the furnace with cylindrical chamber and center pipe.
IRRI, in cooperation with Nong Lam Univeristy (NLU), has recently upscaled the Hohenheim-type inverted draft automatic furnace, which enables each rice husk feeding to last to one whole hour. The burning is even, keeping the drying temperature constant. The furnace can be matched with the SHG-4 four-ton dryer.
Components of a rice husk furnace
Firing a rice husk furnace
The furnace should burn without smoke or fly ashes.
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Prepared by M Gummert with inputs from JF Rickman (2004); updated by M Gummert (2010)