Analyzing the kinetics in the filtration drying of crushed cotton stalks

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 %.

Kinetic Regularities of the Filtration Drying of Barley Brewer’s Spent Grain

“…A schematic view of container 5 is given in the literature. 22 To study the kinetics of filtration drying of barley brewer's spent grain, three series of experiments were conducted, the peculiarity of which was the change in a certain process parameterthe temperature of the thermal agent T, the velocity of the thermal agent v 0 , and the height of the wet material layer H. It is known that the drying process of dispersed materials is divided into two periods: 19 the first period is a complete saturation of the thermal agent with moisture, and the second period is a partial saturation of the thermal agent with moisture. To determine the values of the critical moisture content w с cr and the critical time τ cr at different temperatures of the thermal agent and different filtering rates of the thermal agent, the renowned method was used.…”

“…18 Filtration drying is an intensive drying method that allows to increase the drying intensity and reduce specific heat and energy consumption. [19][20][21] The principle of filtration drying is that the thermal agent moves through the porous structure of a gaspermeable material under a pressure drop. 18 The process of heat and mass transfer occurs on the intra-capillary surface, which exceeds the geometric surface of the dried material.…”

Використання Відходів Виробництва Кави Як Сировини Для Твердого Палива

“…The preparation of the initial material consisted in drying it to the recommended values, taking into account the high moisture content [16][17][18]. Preliminary drying of raw materials was carried out on a laboratory installation for filtration drying [19], according to advantages of using this drying method [20].…”

Design and performance study of a dual-axis solar tracker system for the climate of Eastern Libya

“…As a result, for horizontal surfaces (ε = 0°), the factor F WG is equal to 0, but for vertical surfaces (ε = 90°), the factor F WG is equal to 0.5 [18][19][20].…”