ОПРЕДЕЛЕНИЕ ТЕМПЕРАТУРЫ ДИСКА ПРИ ОБЖАРКЕ ЗЕРНА В УСТАНОВКЕ КОНТАКТНОГО ТИПА

Abstract

Analysis of mechanization means for roasting grain, which is used in animal feed, showed that they have a number of disadvantages: low quality of grain roasting, high cost, increased specific metal consumption and specific energy consumption. The development of new technical means capable of frying grain efficiently, taking into account resource conservation, is a pressing and important scientific and technical problem. A physical model of the installation with a working body, which is made in the form of a flat spiral, was developed to solve it. The device includes a casing made in the form of a vertically mounted cylinder, the outer surface of which is covered with heat-insulating material, from which excess moisture is removed through a perforated plate in the form of steam. The study of the developed installation was carried out in laboratory conditions for barley grain. For the roasting process, we chose specific energy consumption as an optimization criterion; the most significant independent factors were the heating temperature of the disk and the residence time of the grain on the disk. The range of changes in the heating temperature of the disk in experiments to avoid charring of the grain was 180 - 250ºC, and the time the grain remained on the disk was 140 - 200 0C. To assess the quality of grain roasting, the mass fraction of dextrins was determined. As a result of the study, it was established that the rational value of the disk temperature is 224 ºС, and the residence time of the grain in the installation is 168 s. The specific energy consumption for roasting grain at such values of independent process factors is 3922 kJ h/kg, and the throughput of the installation reaches 30 kg/h. The quality of grain roasting meets the requirements.