Pembuatan fluidized bed dryer untuk pengeringan benih pertanian secara semi batch

Oleh :
Irma Indriani - I8306003 - Fak. Teknik

ABSTRACT Melon seed is one of agriculture seed product, it is have the high economic cost. Now, the phenomenon in the villager community is they was drainage the agriculture seed by sunrise energy by spread it in yard or in the rack for drying. This method have any weakness, beside depend for the weather it can made the seed be easy to contaminated, have a difficult control, need a large place and this method also need along time to do. Drainage is the method to out or disappear a part of water from the materials with dryer media, till the Equilibrium Moisture Content (EMC) with normal atmosphere condition or the equilibrium moisture which equal with water activity can be safe from the microbiology, enzyme, and chemical damage. The purpose of Fluidized Bed Dryer (FBD) drainage is for dry the agriculture seed to get the equal equilibrium moisture with a short time drainage process. Fluidized Bed Dryer (FBD) is a dryer with fluidization principle. The principle of this drainage machine is blow up the warm air by the blower pass trough the tract above of dryer vessel who pierce material spread out area in order that this materials can be move and have a fluid characteristic. A wet melon seed with 46,21 % of equilibrium moisture and 75 ºC of temperature can get 3,80 % of equilibrium moisture, by Fluidized Bed Dryer (FBD) drainage in 75 minutes of optimum time. At the time in 65ºC of temperature and 90 minutes of optimum time can get 5,18 % of equilibrium moisture. And for 55 ºC of temperature and 120 minutes of optimum time we can get 3,65 % of equilibrium moisture. From the experiment, for 80 gram seed with 43,05 % of equilibrium moisture, 75 minutes of optimum drainage time, in 75 ºC of temperature we can get 3,80 % of equilibrium moisture. And to get a good seed for growth its need at about 11-14 %.