Analysis of Grain Air-drying Process Using Active Airing Method

Grain drying duration and blowing air comparative rate arc analyzed in this article using air drying process which is dependable from initial grain content in Lithuanian climate. Tests' results concluded that calculated grain air-drying duration by given 0,250-0,282 kg/kg (20-22 %) initial moisture content is from 105 to 160 hours and blowing air comparative rate-400-700 m³(th). Mostly serial ventilators are used to blow air through the layer of grain. Having variable aerodynamic resistance conditions, they are not sufficient for the air drying process. Using active airing method, grains are poured step by step into a granary to the certain limit, therefore aerodynamic resistance increases gradually. The way as the new ventilators are designed and operate under variable aerodynamic resistance conditions, slatic pressure of 3050 and 3300 Pa can be achieved which allows to dry grains from 8340 to 25000 kg using new ventilators during a given drying. It is known that by decreasing the thickness of grain layer from 2 to 0,5 meters, due to increased siccative grain quantity rate, the total quantity of air-drying grains can be increased 1,3-2,3 timesVytauto Didžiojo universitetasŽemės ūkio akademij