Effect Of Drying Temperature On Moisture Decrease Of Various Grains With Rotary Dryer Counter Current System

Abstract

Solid drayer meaning water separate from solid substance. One of drying equipment is rotary dryer, it’s consist of one rotary cylinder, horizontal, or rather oblique downwards with DCS (Distributed Control System), in order to control manufacturing process continually or batch-oriented. On this experiment using various grains as the ingredient, such as kidney bean, red soybeans, black soybeans, brown rice and black sticky rice. It’s used three variable, each variable the same weight of 1 kg. Drying performed at 75°C, 85°C, and 95°C. From lab work in getting the rate of drying increased. To kidney bean at 75°C of 5.9438 lb/ft2h, at a temperature of 85°C of 6.2891 lb/ft2h and 95°C of 6.5911 lb/ft2h. To read soybeans at 75°C of 4.8133 lb/ft2h, temperature 85°C of 5.0979 lb/ft2h and 95°C of 5.2323 lb/ft2h. For black soybeans at 75°C of 4.7005 lb/ft2h, at a temperature of 85°C of 5.3557 lb/ft2h and 95°C of 5.4839 lb/ft2h. As for brown rice at 75°C of 2.1071 lb/ft2h, temperature 85°C of 2.1657 lb/ft2h and 95°C of 2.2427 lb/ft2h. And for black sticky rice at 75°C of 2.1541 lb/ft2h, temperature 85°C of 2.2223 lb/ft2h and 95°C of 2.2929 lb/ft2h. Similarly, with evaporation of water levels rising on the material. To kidney bean at 75°C is 2%, temperature 85°C is 4%, and 95°C is 5%. To red soybeans at 75°C is 4%, temperature 85°C is 7%, and 95°C is 9%. For black soybeans at 75°C is 5%, temperature 85°C is 6%, and 95°C is 9%. As for brown rice at 75°C is 9%, temperature 85°C is 12%, and 95°C is 14%. And for black sticky rice at 75°C is 8%, temperature 85°C is 11%, and 95°C is 15%. From the lab found the rate of H2O evaporated is increasing. To kidney bean at 75°C is 5.9438 kg H2O/m2s, at a temperature of 85°C is 6.2891 kg H2O/m2s and 95° C of 6.5911 kg H2O/m2s. To red soybeans at 75°C is 4.8133 kg H2O/m2s, temperature 85°C is 5.0979 kg H2O/m2s and 95°C is 5.2323 kg H2O/m2s. For black soybeans at 75°C is 4.7005 kg H2O/m2s, at a temperature at 85°C is 5.3557 kg H2O/m2s and 95°C is 5.4839 kg H2O/m2s. As for brown rice at 75°C is 2.1071 kg H2O/m2s, temperature 85°C is 2.1657 kg H2O/m2s and 95°C is 2.2427 kg H2O/m2s. And for black sticky rice at 75°C is 2.1541 kg H2O/m2s, temperature 85°C is 2.2223 kg H2O/m2s and 95°C is 2.2929 kg H2O/m2s. The higher the temperature of drying the weight of the H2O evaporated, and H2O evaporated rate of the drying rate will further go up. The rate of drying, evaporation rate of H2O and evaporation of H2O levels directly proportional to temperature. From the lab can be concluded that the best operating conditions of the experiment with a temperature of 95°C because the water content of the teruapkan most high, the evaporation rate of H2O and the drying rate is also the largest resulting grains drier.