Pereyaslavtseva E. The intensification of the thermomoist processes by the spray drying of the certain kinds of bacterial specimens

The current thesis is devoted to the study of the high-temperature process of the spray drying of the following bacterial specimens: "Лактин-К", "Бифацил", "БПС-44Р", "ФГ-5". The abovementioned process is considered to be an alternative to the method of vacuum sublimation dehydration. On the basis of the batteries of experimental and analytical investigations the general mechanisms of the influence of the drying temperature characteristics on thermomoist kinetics were determined. Moreover, the possibility of exercising of the spray-type dehydration at the increased temperature conditions: T=160…180 oC is justified. This enables to intensify the thermomoist processes without lowering the final's product quality. The work includes experimental investigations of the bacterial specimens' kinetic performance in "a drop - steam and gas high-temperature medium" System, mathematical model of the drying process of the single drop of bacterial specimens in spray chamber environment, calculations of the heat exchange rate in the spray chamber at various temperature characteristics of the heat carrier (air). In the experimental part the influence of the number of factors on qualitative adjectives, structural-mechanical data and disperse characteristics of powder-like form of the bacterial specimens and was analyzed and investigated using laboratory and industrial spray driers. The technology of multicomponent biosuspensions preparation for the drying with the use of the spinning-pulsating device is tested. At the spray-type dehydration this technology enables to obtain more homogeneously-structured powder than those product samples whose biosuspension was made according to the stereotyped pattern; and eventually allows to achieve the stable effect of the cells' microcapsulation. The influence of the dispersion methods on the dispersed characteristics of the obtained powder-like product was investigated. The calculations of the cyclone devises operating efficiency to the industrial dryers РЦ-1,2 and СУМ-1,5 were made taking into account the dispersed and structural-mechanic characteristics of the bacterial specimens powders. The new instrument-technologic scheme of the bacterial specimens' production by the spray-type dehydration method and the basic diagram of the spray-type drier for such class of product are elaborated. The efficient drying temperature characteristics and characteristics of the suspensions as spray-drying ob-jects that are introduced jn manufacture are defined