Voskresenskaja E. Combined methods of drying of grain products

Processes and Equipments of Food, Microbiological and Pharmaceutical Productions. – Odessa national academy of food technologies, Ministry of Education and Science of Ukraine, Odessa, 2017. The dissertation is devoted to the reasearch of combined methods of grain drying and development of the dryer on the basis of the RTS and the methods of its calculation. Defects of existing convective grain dryers are defined: low efficiency (up to 40%); low specific moisture release; uneven drying; high costs of drying agent, high energy costs. The methods for solving drying problems are proposed - the use of combined drying technologies, heat recuperators, thermosyphons, heat pipes in drying technologies, utilization of the heat of exhaust gases from grain dryers. To evaluate the proposed circuit solutions based on analytical and experimental studies, designs of experimental instalations have been developed: a combined dryer with rotating thermosyphon and a combined microwave dryer. Large-dispersed and fine-dispersed food materials - cereals - were chosen as treatment objects. Experimental studies of the kinetics of drying were carried out on the following products: wheat, maize, boiled peas, millet, amaranth. Methods for experimental studies of the processes of hydrodynamics, heat-mass transfer in developed dryers have been developed. Analytical and experimental studies confirmed that the grain dryer delivers ecologicaly clean grain drying with high energy efficiency. It was found that the rate of drying in the dryer affects the temperature of the module surface, the amount of grain and RTS rate of turn-over. The mathematical description of the kinetics of drying was developed to similarity numbers engineering method and computer program for calculating the dryer. A computer simulation of the drying process in grain dryer was calculated. The project of scientific and technical documentation of the dryer was developed.