| Autor: |
Бошкова, І. Л., Волгушева, Н. В., Капауз, К. О., Гречановський, А. П. |
| Předmět: |
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| Zdroj: |
Refrigeration Engineering & Technology; 2024, Vol. 60 Issue 2, p1-10, 10p |
| Abstrakt: |
A microwave-convective dryer for seed grain is considered as an effective drying system that allows reducing energy consumption. It is emphasized that for optimal design and cost-effective operation, as well as proper observance of optimal storage conditions for agricultural products, in particular grain products, it is advisable to use microwave heating with simultaneous blowing of air through the layer and to ensure utilization of air heat from the magnetron cooling system. It was determined that one of the main problems of using a microwave field for processing dense layers of grain is to ensure sufficient uniformity of the distribution of the microwave field. It is emphasized that the use of horn-type waveguides makes it possible to effectively irradiate grain with microwave energy. The scheme of the installation for microwave-convective grain drying is proposed, in which horn antennas are proposed as waveguides, closed with fluoroplastic plates to prevent water vapor from entering the working chamber to the waveguide. The calculations of the cooling system of the anode blocks of magnetrons and the calculation of the grain preheating chamber are presented. The heating medium is air blown through the layer in a horizontal direction at a filtration speed of 0.14 m/s. Based on the calculation of the working chamber of a microwave-convective dryer with a dense layer moving with a flow rate of G = 1,25·10-2 kg/s, the power consumed from the network by magnetrons, taking into account the efficiency of the microwave chamber, and the appropriate number of magnetrons are determined. At the drying rate N = 5,8·10-5 с -1 and using three magnetrons with a total power of 3 kW, the specific consumption per kilogram of evaporated moisture will be 5.3 MJ/kg. The use of a heat recovery system in the preheating chamber reduces energy consumption by 1.3 times. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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