Abstract
By using a numerical model, developed based on the proposed physical and mathematical models, we performed a numerical study of non-stationary temperature fields and moisture content of the process of infrared radiation drying of fluting. A distinctive feature of present study is a combined consideration of the kinetics of drying process, translucency to the IR radiation of the material using the approximations of the Burgers' models, gray medium and diffuse reflection of boundaries. Verification of the numerical model demonstrated a convergence of results of numerical modeling of the fluting surface temperature, duration and speed of its drying with the data of physical experiment within the range of 5 % on the interval of change in the square meter mass of dry fluting from 0.112 kg/m 2 to 0.2 kg/m 2 . It is substantiated that the developed numerical model makes it possible to define kinetic patterns and basic parameters required to intensify the process of drying and to design the appropriate equipment.
Highlights
In connection with the growing volume of production and demand for corrugated cardboard [1], there has been a significant increase in the production of paper for corrugating – fluting
The fluting is rapidly heated from the heat that is released in its volume when exposed to the IR radiation, reducing the duration of its heating and drying in general
– to formulate a physical model based on the analysis of physical processes that occur during radiation drying of fluting;
Summary
In connection with the growing volume of production and demand for corrugated cardboard [1], there has been a significant increase in the production of paper for corrugating – fluting. The most energy-intensive and metal-intensive stage in the production of fluting is a drying process on the drying cylinders of paper machine [2] The fluting is rapidly heated from the heat that is released in its volume when exposed to the IR radiation, reducing the duration of its heating and drying in general This makes it possible to reduce the number of drying cylinders in a paper machine and, the cost of water vapor. The lack of direct contact between a fluting and IR emitters (heaters) makes it possible to apply the drying process immediately after its gluing In this case, under condition of using “clean” electricity (for example, nuclear power), the IR heaters do not emit combustion products of fossil fuel into the environment. A relevant task is to develop mathematical and numerical models for the process of IR drying of fluting to determine kinetic parameters of the process, which are required to design new equipment with the minimization of the number of physical experiments
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