PENGARUH LAMA WAKTU PERENDAMAN DAN SUHU KONDISI OPERASI PADA GABAH DENGAN MENGGUNAKAN ROTARY DRYER FIREBRICK (The Effect of Immersion Time and Temperature condition in operation on the Rate Drying of Unhulled Rice on Rotary Dryer Firebrick )

Abstract

Drying is a process-water discharge of materials using thermal energy so that the level of the water content of the material menurun.Proses drying is usually accompanied by the evaporation of water contained in the material. In this lab used a rotary kiln dryer to dry the grain. Rotary dryer consists of a horizontal cylindrical shell mounted on a roller bearing, so the cylinder can rotate and tilt angle position a little shaping. Feed entered at the high end of the cylinder, and will come out as a dry product on the other end. As the heater can be used hot air or exhaust gases of combustion are still having a high temperature. On grain drying using the rotary dryer can be concluded that the greater the temperature used for drying the evaporative H2O will further increase. The greater the temperature used to dry the less time for drying. The higher the temperature the higher the rate of drying is used and the more material used, the lower the rate of drying pengeringannya.Laju will decrease if the water layer that covers the material has a thin, water in uapkan the less, so it needs a bit of heat as well. On grain drying with variable temperature 55oC, 60 oC, 65 oC, 70 oC, 75 oC obtained% H2O evaporated with 6.67% of data, 7.74%, 8.91%, 9.76%, 10.65% and Data obtained for the drying rate 0.098 lb.ft2 / h, 0.187 lb.ft2 / h, 0.197 lb.ft2 / h, 0.212 lb.ft2 / h, 0.237 lb.ft2 / h. Optimum temperature is 65 ° C, not too low and not too high for the heating temperature. At the time variable immersion 24 hours, 27 hours, 30 hours, 33 hours, 36 hours obtained obtained with the data teruapkan% H2O 4.26%, 9.46%, 10.92%, 11.49%, 16.63% and Data obtained for the drying rate of 0.049 lb.ft2 / h, 0.101 lb.ft2 / h, 0.132 lb.ft2 / h, 0.142 lb.ft2 / h, 0.196 lb.ft2 / h. From the experiment it can be concluded that the longer the immersion time, the greater the drying rate.