Transcription of Drying Basics and Principles
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Drying Basics and Principles
Drying Basics and PrinciplesM Unit, CESD IRRI LB PhiliiIRRI Los Ba os, Drying process Moisture gradientTempering Tempering Heated air Drying and yglow temperature dryingDrying processyg I Preheating period Drying rate is slowly increasingincreasing only a very slight change in MC II Constant-rate period Drying rate is constant in time removal of surface water grain temperature is constantdtt energy used to evaporate water III Falling-rate period Drying rate declines over time-> temperatures for Drying dddrying rate declines over time transfer of internal moisture to the surface Drying rate declinespaddy Seeds Maximum of 43 C For milling grain heats up (danger) for paddy grain starts at 18%g During constant-rate period: > 100 C During falling-rate period: < 55 C(depends on Drying system) Drying rateyg Stated in percent moisture removed per hourpp Affected by: Temperature and relative humidity of the Drying air Seeds: max.
Grain Quality Medium quality, uneven drying of bottom and top layer Heater Drying air temperature: 43Drying air temperature: 43°C A.) Kerosene burner, 2.0 l kerosene/h B.) Rice hull furnace, 3-4 kg rice hull/h Fan Axial flow fan, 2200 rpm 1800 cfm at 20mm H2O1800 cfm at 20mm H2O A.) Electric motor, 2.5 kW B.) Gasoline engine, 0.75l gasoline/h ...
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