Abstract
The kinetics of the drying process in continuous drum dryers differs from the drying of single objects in a batch mode. Drying process is affected by too many factors; hence, it is practically impossible to obtain an analyt- ical solution from the initial equations of heat and mass transfer, since the duration of drying depends on the opera- ting parameters. Therefore, it is of high theoretical and practical importance to create a highly efficient rotary drum dryer. Its design should be based on an integrated research of non-stationary processes of heat and mass transfer, hydrodynamics of fluidized beds, and drying kinetics in the convective heat supply. The experiment described in the present paper featured sunflower seeds. It was based on a systematic approach to modelling rotary convective drying processes. The approach allowed the authors to link together separate idealized models. Each model characterized a process of heat and mass transfer in a fluidized bed of wet solids that moved on a cylindrical surface. The experiment provided the following theoretical results: 1) a multimodel system for the continuous drying process of bulky mate- rials in a fluidized bed; 2) an effective coefficient of continuous drying, based on the mechanics of the fluidized bed and its continuous dehydration. The multimodel system makes it possible to optimize the drying process according to its material, heat-exchanger, and technological parameters, as well as to the technical and economic characteristics of the dryer.
Highlights
The general theory of heat and mass transfer in capillary porous and other dispersed media belonged to Prof
Each model characterized a process of heat and mass transfer in a fluidized bed of wet solids that moved on a cylindrical surface
We developed the mathematical models in accordance with the analytical multimodel system for the continuous drying process of wet solids in a fluidized layer
Summary
The model describes the physical properties necessary for conducting hydrodynamic and heat transfer processes In this case, the linear dimensions of the bulk material are determined by its volume, surface area, equivalent diameter, sphericity coefficient (non-sphericity), and the value of specific surface. In the general case, when organizing continuwet solids in rotating drum dryer, the drying agent flows ous drying of wet solids in a fluidized bed, the coolant around the particles in the fluidized bed of the granular product and between the particles of the material in the channels [6] In this connection, we can point out external (flow-around), internal (filtration), and mixed hydrodynamics problem. For a convective drying process, the energy efficiencoefficient of drying It is based on the analysis of the cy can be expressed by the following relation: mechanics of a fluidized bed of wet solids on a cylindrical surface with regard to the continuous dehydration. They are defined as the ratio of the usable energy
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