Research of contact grain dryer with vibrating transporting working body
Modern trends in development of agricultural organizations in the Russian Federation have identified prospects for design of small-sized equipment. Thus, the use of mini-dryers in existing farms can improve the efficiency of post-harvest grain handling. The authors proposed a patented design of a contact grain dryer. On the basis of experimental studies, it was revealed that a prospective direction for improving the quality of drying in contact grain dryers is the use of an appropriate working body. Its type enables to meet the requirements for the drying process in contact heat supply Devised and tested device for drying grain includes a casing of rectangular cross section, the surface of which is covered with a layer of insulating material, a loading hopper, a discharge window and a transporting body installed inside the casing. There are heating elements under the transporting working body. Transporting working body is made in the form of a box and is installed with the possibility of transmitting vibrations to this body. The upper surface of the box is stepped, made of heat-conducting material. Oscillatory vibration to the transporting working body is transmitted by a drive. As a result of theoretical studies, the basic equations have been formulated that reveal the nature of the thermal regime during contact drying of triticale grains. As a result of the analysis of the obtained mathematical models of grain drying process, the appropriate values of the main independent factors have been revealed, specific heat consumption for evaporation of moisture from triticale grains is q<sub>ucf</sub>.<sub>.opt </sub>is 4.68 kJ/k<sub>moist</sub>: average temperature of the heating surface t<sub>gr.sr.opt</sub> = 132 <sup>0</sup> C, grain drying time τ<sub>opt</sub> = 8 s, grain speed v<sub>$</sub> = 0.22 m / s. The capacity of the device is 132 kg / h. When using the devised device for drying grain per 1 ton of dried grain, the economic effect was 798.9 rubles, the annual economic effect was 79896.6 rubles.