Abstract
The drying of crushed plant-derived materials, in particular crushed cotton stems, is a complex heat-exchange and technological task. Resolving this task successfully ultimately determines the specific energy costs of the drying process and the quality of the resulting products. The rational drying regime of crushed cotton stems should ensure the minimum possible process duration, energy costs, and provide the necessary quality characteristics of the dried material. To address this issue, it is necessary to investigate the influence of technological parameters of the process (the temperature and filtration rate of the heat agent), as well as the thickness of the stationary layer of crushed cotton stems, on drying kinetics. This paper has generalized experimental studies into the kinetics of filtration drying of crushed cotton stems during the period of complete saturation of the thermal agent with moisture. The influence of the temperature of the drying agent, the speed of its filtering through a stationary layer of different heights of wet crushed cotton stems, on the kinetics of filtration drying has been shown. The study's results demonstrate the dynamics of moisture removal at different parameters of the heat agent and the heights of the stationary layer of crushed cotton stems. The resulting dependence has been established, which is used to determine the value of the kinetic coefficient η for crushed cotton stems; the value of the kinetic coefficient has been calculated, a=20.74 1⁄m. The dependence has been derived, using which makes it possible to generalize the kinetics of filtration drying of crushed cotton stems during the period of complete saturation of the heat agent with moisture within the limits of changing the moisture content of the veneer The comparison of the experimental data with those obtained theoretically has shown that the maximum absolute value of relative error does not exceed 15.2 %.
Highlights
Theoretical and experimental studies into the kinetics of filtration drying of crushed cotton stalks are of relevance both scientifically and practically
The use of the filtration method of drying could significantly improve the efficiency of the drying process by ensuring high coefficients of heat and mass exchange in the stationary layer and the use of a low-temperature heat agent
The following tasks have been set: – to theoretically analyze the kinetics of drying wet materials; – to experimentally investigate the kinetics of filtration drying of crushed cotton stalks at different temperatures and filtration speeds of the heating agent, as well as at different heights of the stationary layer; – to derive estimation dependences for calculating the change in moisture content in time and the time of filtration drying of crushed cotton stalks in the period of full and partial saturation of the heating agent with moisture; – to compare experimental data with theoretically calculated data and establish the value of relative error
Summary
Most of it is the stems and roots of plants of this technical crop [1]. Cotton stalks (guza-paya), the volume of formation of which annually is more than 0.5 million tons, are a very promising raw material for recycling in order to obtain building materials. Other attempts to recycle guza-paya have not been successful for any large-scale practical application. Often, these wastes are burned directly in the fields or processed using thermochemical processes, such as pyrolysis, for the purpose of energy recovery, as shown by the authors of [2, 3]. Theoretical and experimental studies into the kinetics of filtration drying of crushed cotton stalks are of relevance both scientifically and practically
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