Calculation of the radius of the cutting torch when drying liquid heterogeneous systems with complex rheological properties
Abstract
The value of the radius of the spray torch at different heat-technological parameters of drying and the necessary information for the analysis and optimization of the operation of the spray drying unit, depending on the productivity, its technical characteristics and the physicochemical characteristics of the material being dried, can be quickly obtained using a mathematical calculation algorithm.
The calculations were carried out in Microsoft Excel according to the formula of Acad. A.A. Dolinskyi, in which the value of the average volumetric-surface diameter of a droplet in the spray plume is determined by the Fraser formula. The results of calculating the radius of the spray plume are presented on the example of a mushroom suspension, which is characterized by complex rheological properties, obtained using a special technology of the Institute of Technical Thermophysics of the National Academy of Sciences of Ukraine.
The calculations were carried out for a small-sized spray dryer with a cylindrical part of the chamber 1.3 m in diameter and a disk atomizer at different parameters: air temperature at the chamber inlet, the unit's capacity for liquid product and its temperature.
The dependences obtained from the calculated data demonstrate the possibility of reducing the radius of the spray of a liquid heterogeneous system with a temperature of 50-60 ° C by an average of 20% in comparison with the cooled product, and with an increase in the temperature of the coolant at the inlet to the chamber from 160 ° C to 190 ° C, the productivity of the spray drying unit increases by 25-30%.
The high convergence of the calculated data with the experimental ones indicates the advisability of using this mathematical calculation algorithm for a quick and well-grounded determination of the rational dimensions of industrial spray dryers for the production of dry forms of new types of products, taking into account the complex rheological properties of the initial high-humidity heterogeneous systems and the peculiarities of the kinetics of their drying.
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