The research subject is a multivariate analysis of the air-flow classification process of the straw heap with a predetermined fractional composition supplied to the cleaning after the drum destroyer. The work objective is to identify patterns of the air separation using three pneumatic ducts with a linkage parameter variation. The investigative technique is an analytical modeling. The effect of probabilistic characteristics of the heterogenic thrashed heap supply, airflow velocity distribution by the separator width, and density function of heap components terminal velocity on the separation is evaluated. The air-flow classification process on each section of the pneumatic duct is considered. To this end, the mathematical expressions averaging the air classifi-cation indicators of the consistently functioning three pneumatic ducts and a stochastic quasistatic mathematical model of the separator operation with three pneumatic ducts in series are used. The results of the separator parametric synthesis and its techno-logical parameters are presented. The fractional constituents of the heap components and their percent-sizes in each air-classified fraction are shown. The possibility of the air-flow classification of the crushed straw heap in the predetermined factions at the preset productivity of 0.6-0.7 kg/m∙s is revealed. It is found that under the rational functioning of the air separator, the straw con-tent in the service faction is 97.03%. In this case, the minimum grain content is 0.03%, and mineral impurities are 0%. It is re-vealed that the air separator with three pneumatic ducts in series is sufficient for separating the crushed straw heap with the predetermined agro-technical requirements.
air-flow classification machine, mathematical model, milled strawy material, modeling, indicators of separation.
Использование измельченной соломы [1] для получения из нее целлюлозного полуфабриката тре-бует соответствующей технологической обработки. В частности, необходимо добиться ограничения длины основной массы соломы в пределах 30–50 мм [2, 3, 4]. Таким образом, ставится задача по сепарации измельченной соломы из исходной измельченной соломистой массы с известным фракционным составом и технологическими свойствами ком-понентов.
Анализ этих технологических свойств позволил принять гипотезу о возможной сепарации гетерогенного во-роха в пневмосепараторе с одним или несколькими последовательно функционирующими вертикальными пневмока-налами с выделением деловой соломистой фракции [5, 6].
При многомерном анализе этой технологической операции учитывали вероятностные характеристики:
— ввода соломистого вороха в вертикальные пневмоканалы;
— распределения скоростей воздушного потока по ширине пневмоканалов;
— распределения скоростей витания всех компонентов, входящих в состав соломистого вороха [6–9].
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13. Saitov, V.E. Matematicheskoe modelirovanie razdeleniya vozdushnym potokom otkhodov pri ochistke zerna. [Mathematical modeling of the airflow classification of the waste in grain cleaning.] Tractors and Agricultural Machinery, 2007, no. 5, pp. 39–41 (in Russian).
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