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We studied the kinetic regularities of filtration drying of corn alcohol distillery stillage. The kinetic curves characterizing the process of filtration drying of corn alcohol distillery stillage at different parameters of the stationary layer of the studied material and thermal agent were obtained: at different heights of the wet material, and at different temperatures of the thermal agent and the velocity of its movement through the stationary layer. The calculated dependences for determining the intensity of the filtration drying process in two conditional drying periods were proposed. The equations for the calculation of drying time separately for each conditional drying period were given. The maximum value of the relative error is 19.42%, while the average relative error is 5.37%, which is an acceptable deviation in practical calculations of experimental and industrial drying installations. [ABSTRACT FROM AUTHOR]

The article presents the results of a study of the kinetic regularities of filtration drying of coffee production waste in order to increase its shelf life at different process parameters-the height of the stationary layer of wet material (40 mm, 80 mm, 120 mm, 160 mm), the velocity of the thermal agent (1.24 m/sec, 1.76 m/sec, 2.29 m/sec, 2.82 m/sec) and its temperature (60°C, 70°C, 80°C, 90°C). The influence of the temperature of the thermal agent and the velocity of its filtration through a stationary layer of different heights of wet coffee production waste on the kinetics of the filtration drying process is shown. The analysis of the experimentally obtained drying kinetic curves indicates the presence of two drying periods: the first period, complete saturation of the thermal agent with moisture, and the second period, partial saturation of the thermal agent with moisture. The results of the study indicate an increase in the drying time with an increase in the height of the stationary layer of the dried material, a decrease in the temperature of the thermal agent, and a decrease in its velocity. As a result of the graphical analysis of the obtained experimental data, generalized dependencies describing the intensity of the filtration drying process in the first and second drying periods were determined. These generalizing dependencies allow us to obtain equations for determining the time of the filtration drying process in both periods, which makes it possible to establish the total duration of the technological process. To assess the compliance of the experimental data with theoretically calculated ones, a graphical distribution of the obtained errors was constructed. It has been determined that the maximum absolute relative error of conformity of experimental data to theoretically calculated values is 21.78%, the average absolute relative error is 5.83%. The magnitude of the errors makes it possible to use the obtained equations for practical calculations of drying equipment. [ABSTRACT FROM AUTHOR]

The article describes preparation of an alternative solid fuel from corn alcohol distillery stillage, which is the waste of the alcohol industry. We determined the calorific values of the dried alcohol distillery stillage and experimental briquettes, which were made of it by pressing at high pressure and temperature. The average value of the higher calorific value of the dried alcohol distillery stillage is 19545 kJ kg-1, while this value for the produced briquettes is in the range of 22445 to 26594 kJ kg-1. The established calorific values exceed those of analogues, which are widely used for the producing of alternative solid fuels (miscanthus and energy willow). Solid fuel prepared from corn alcohol distillery stillage can be used both in a solid form and in a dried one. The proposed method for preparation of the solid fuel allows providing additional utilization of alcohol distillery stillage and rational use of secondary raw materials of alcohol production. [ABSTRACT FROM AUTHOR]

The article describes the results of experimental studies on kinetics of the filtration drying of corn distillery stillage, which has previously proven its effectiveness in drying other crops and various dispersed materials. The experimental data are presented in the form of graphical plots describing the change of material moisture over time depending on the temperature of the drying agent (60, 70, 80 and 90°C) and the layer height (40, 80, 120 and 160 mm). The obtained results are analyzed and the changes that occur on the filtration drying curves depending on the change in the material layer height and drying agent temperature are described. It is shown that the filtration drying time of alcohol distillery stillage increases with increasing the material layer height. It is determined that the drying potential remains constant at the same parameters of the drying agent. It is shown that the rate of moisture removal during the filtration drying does not depend on the material layer height. It is found that the average residual moisture of corn alcohol distillery stillage is 3.14±0.06 wt.%; this value satisfies industrial needs for an increase in its shelf life and the possibility of long-term storage and transportation. [ABSTRACT FROM AUTHOR]