ЦЕЛЕСООБРАЗНОСТЬ ПРИМЕНЕНИЯ ПРЕДВАРИТЕЛЬНОГО ОЗОНИРОВАНИЯ ВЛАЖНОГО ЗЕРНА ПЕРЕД СУШКОЙ

Abstract

When drying grain, ozone enters into a number of chemical reactions that contribute to an increase in the partial pressure inside the grain and a change in the temperature gradient, which accelerates vaporization and increases the moisture diffusion coefficient. Practical application of the ozone-air mixture as a drying agent has not been established due to difficulties with process safety, the lack of substantiated ozone treatment modes, and imperfect ozonizer designs. The feasibility of using the ozonation process during drying was determined based on experiments on changing grain moisture using the ozone-air mixture as a drying agent. It was proposed to modernize the existing grain drying complexes by retrofitting the buffer silos with an ozonation system. A method for drying grain material has been developed that consists of two sequentially performed operations: preliminary ozone treatment of wet grain and its subsequent drying in a serial grain dryer. Three experiments were conducted to determine the effect of preliminary ozonation on the moisture separation process when heating a grain heap. It was found that the use of preliminary ozone treatment of wet grain in a buffer tank before the grain dryer with an ozone concentration of 5, 7.5 and 15.3 mg/m3 made it possible to increase the relative drying rate by 1.51-1.84 times. Preliminary ozonation of wet grain is advisable because it not only reduces the costs of bringing the grain to a conditioned state in terms of moisture, but also has a positive effect on the quality of the dried material.