Abstract
At the choice of the mode of safe drying of grain mass it is necessary to consider its heterogeneity on moisture content. It is an undesirable factor of which it is necessary to get rid. When increase in moisture inconstant the stability of grain mass at storage decreases, there is a danger of emergence of heating, the overall performance of dryers and other processing equipment decreases, energy costs for seeds production rise. To eliminate this shortcoming located in a grain layer or grain stream the dried-up product should be mixed carefully for the best uniformity. However not uniformity on individual moisture content of separate grains will remain. For its decrease combination of lying with material concitation is used. Researches were conducted in batch-operated laboratory machine. The humidified seeds of sugar beet were blowed-through with the drying agent speed of 0.5 m/s and temperature of 45 degrees Celsius. Moisture removal between concitations did not exceed 2.5 percent for selection seeds and 3.0 percent for ordinary ones. Duration of the periods between concitations can be determined in the analytical way. Thickness of a layer of seeds allowing drying without concitation decreases on square dependence on increase in moisture content. A contact moisture exchange between the damp and dried caryopsides for 30 min and more make it possibledrop-off in the unevenness of drying up to 0.5 percent.
Highlights
At the choice of the mode of safe drying of grain mass it is necessary to consider its heterogeneity on moisture content
When increase in moisture inconstant the stability of grain mass at storage decreases, there is a danger of emergence of heating, the overall performance of dryers and other processing equipment decreases, energy costs for seeds production rise
Duration of the periods between concitations can be determined in the analytical way
Summary
При выборе режима безопасной сушки зерновой массы необходимо учитывать ее неоднородность по влажности. С увеличением невыравненности зерновой массы по влажности снижается устойчивость ее при хранении, появляется опасность возникновения очагов самосогревания, уменьшается эффективность работы сушильных установок и других машин по обработке, возрастают затраты энергии на производство семян. Для устранения этого недостатка на отдельных участках зернового слоя или зернового потока высушенный продукт следует тщательно перемешивать, чтобы достичь наилучшей выравненности. Влагосъем между перемешиваниями не превышал 2,5 процента для селекционных и 3,0 процента для рядовых семян. Допускающая сушку без перемешивания, убывает по квадратичной зависимости от повышения влажности. В перемешанных семенах происходит контактный влагообмен между влажными и подсушенными зерновками, что при суммарной длительности контакта не менее 30 мин позволяет дополнительно снизить неравномерность сушки до 0,5 процента. Исследование сушки селекционных семян в плотном слое // Сельскохозяйственные машины и технологии.
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