Serdiuk A. Development of an electrotechnical complex for the preparation of liquid feed based on rotary-pulsation technologies

An electrotechnological complex for the preparation of high-quality liquid grain fodder based on rotary-pulsation technologies is proposed. Numerical modeling of the processes of hydrodynamics and heat and mass transfer in a rotary-pulsation apparatus using the DPEI technology was carried out. As a result of numerical calculations, the fields of pressures, temperatures and speeds were obtained, which made it possible to determine the optimal geometric dimensions of the rotor and stator, the size of the gap between them, and to determine the number and sizes of the holes of a rectangular profile, at which the process of processing the mixture will be most effective. On the basis of the developed simulation model in the Matlab Simulink software environment, the regularities of the transient processes of the electric drive of the rotary-pulsation unit as part of the electrotechnical complex for the preparation of liquid grain fodder are established. According to the results of mathematical modeling, an experimental experimental unit for the preparation of liquid grain fodder was manufactured. Оperating modes of the rotary-pulsation unit were investigated. The main modes of operation of the engine of the electrical engineering complex were studied and it was proved that the use of a frequency converter to change the speed of rotation of the working bodies of the installation in the process of preparing liquid feed allows to reduce energy costs for their preparation by 7%. Analyzing the results of the research, it was found that the processing of the water grain environment should be carried out using a frequency converter in order to reduce energy costs for the preparation of a unit of fodder products with the following parameters: the content of the solid phase in the mixture is 30 %, the speed of rotation of the rotor of the installation varies during the processing from 3000 to 2400 rpm, the gap between the rotor and the stator is 500 μm, the duration of processing the water-grain mixture is 20 minutes (or 25-30 processing cycles); the temperature of the mixture is no more than 55℃, the viscosity is about 2 Pa‧s. Іt was established that the liquid grain feed produced using the developed technology has 15 % higher nutritional characteristics than the feed produced according to the existing technology of production of fodder for domestic animals. The analysis of the economic efficiency of the use of an electrotechnical complex in the technology of preparing liquid grain fodder showed that the proposed technology allows reducing the consumption of electrical energy by 25-30 %, while the liquid fodder obtained in the manufacturing process has 15 % more nutritional and energy value than fodder prepared according to the existing technology. The annual economic effect of feeding one hundred pigs is about 103 thousand hryvnias.