Abstract
Experimental studies of the kinetics of the process of drying triticale grain during counter-current-direct blowing of the grain layer were carried out. In the experimental installation, a programmed change in the direction of the drying agent flow through the grain layer was carried out and the actual conditions of the drying agent supply through the supply and discharge boxes of the shaft grain dryer were emitted. Analysis of drying curves and drying rate of triticale grain showed the presence of only a period of decreasing drying rate, in which the intensity of moisture diffusion is significantly less than the intensity of moisture exchange. The organization of the experiment made it possible to fully adapt it to industrial mine grain dryers, in which the drying process is carried out in a continuous mode. Based on the results of the study, an empirical model of the drying process is proposed in the form of an exponential function, which establishes a unique functional relationship between the current moisture of the grain and the main parameters of the process: temperature, speed, moisture content of the drying agent and the thickness of the blown layer. Taking into ac-count the requirements to the process modes of grain drying, the triticale analyzes the ratio between the grain temperature and its humidity at various values of the mode parameters, which is proposed to be used as a restriction on the drying temperature mode.
Highlights
Конвективная сушка злаковых культур в шахтной зерносушилке относится к нестационарным процессам, происходящим в капиллярнопористой среде, имеющей хаотическую структуру, изменяющуюся во времени и пространстве [1, 2]
Experimental studies of the kinetics of the process of drying triticale grain during counter-current-direct blowing of the grain layer were carried out
drying rate of triticale grain showed the presence of only a period of decreasing drying rate
Summary
Экспериментально- Tertychnaya T.N., Shevtsov A.A., Kulikov S.S. Experimental and статистическое исследование процесса сушки зерна тритикале при statistical analysis research of the triticale grain drying process when противоточно-прямоточном продувании зернового слоя // Вестник coun-tercurrent-direct-flow blowing of the grain layer. Поэтому в инженерной практике используются экспериментальные методы исследования, связанные с получением кривых сушки в условиях стационарных режимов, когда параметры сушильного агента постоянны. Однако такие режимы не являются характерными для промышленного процесса сушки зерна, когда для сохранения его высокого качества осуществляется ступенчатая сушка при повышении температуры сушильного агента и уменьшении его линейной скорости [3,4,5]. Скорость воздуха в слое невелика (0,2–0,4 м/с), а скорость движения зерна примерно в 100 раз меньше скорости воздуха в связи с этим активная поверхность зернового слоя значительно меньше суммарной [6]
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