Authors:
A. A. RUMYANTSEV, candidate of technical sciences, associate professor
Kostanai Engineering and Economic University named after M. Dulatov (59 Chernyshevsky Str, Kostanay, Republic of Kazakhstan)
V. S. KUKHAR, candidate of economic sciences,
Ural State Agrarian University (42 K. Libknekhta Str., 620075, Ekaterinburg)
Abstract. The article proposes a methodology for heat calculation of the set, combining functions of the steam generating unit; and the grain steamer. Theoretical studies have shown a significant effect of the mass flow rate of water supply and the input power for the duration of warming the bottom to a technologically specified temperature. The input power should not be large when the steady-state temperature can significantly exceed the technologically specified temperature of the generating steam of the set floor. This will lead to an increase in its size, weight and additional costs. Mass flow rate of water should provide a sufficient degree of humidification of grain for obtaining its high technological properties. Less tangible effect exerted on the heating dynamics of the set is its size, determined by the internal diameter of the operating chamber, the increase of which leads to an increase in the mass and area of the outer surface. A calculation show that approximately equal, but not so significant, influence on the heating dynamics of the set, other things being equal, exerts the area of the outer surface of the thermal insulation, as well as the heat transfer coefficient. An increase in the average surface temperature of the thermal insulation from 60 to 120 °C increases the heat transfer coefficient from 12.0 to 15.9 J/(m2 × s), which leads to a decrease in the temperature of the heated bottom of the set 10 minutes from the start of the process by 8 °C, whereas a reduction in the input power from 60 to 54 kW leads to a decrease in this temperature by 17 °C. Energy-intensive processes of water heating and steam generation significantly influence the heating dynamics of the set. The heat calculation of the set is limited by the temperature parameters of the steam- ing process, and allows coordinating the optimum value of the input power with the speed and the heating time of the installation bottom to the preset temperature.
Keywords: heat, calculation, set, steam generating unit, steamer, processing, grain.
