Research of energy expenditures for mechanical mixing of raw materials in a biogas reactor
DOI:
https://doi.org/10.15588/1607-6761-2025-2-2Keywords:
Reynolds criterion, comparative analysis, energy efficiency, Euler's criterion, mechanical mixing, electric motor power, energy consumptionAbstract
Purpose. Study of energy consumption by mechanical mixers and selection of an energy-efficient mixing device to ensure reduction of energy consumption for the biogas production process and increase interest in its further processing into other types of energy.
Methodology. Comparative analysis and use of mathematical modeling methods to determine the amount of energy consumed for mixing, generalization of the results obtained.
Findings. The formation of the energy system consists in including renewable alternative energy systems, including biogas technologies. The energy efficiency of which depends on the amount of energy consumed for the processes of intensification of the fermentation of raw materials. One of the main means of intensification is careful and frequent mixing of raw materials during fermentation. The presence of various types of devices for mixing substances in reactors confirms the relevance of the issue of developing energy-efficient means to accelerate fermentation and increase the profitability of further actions with biogas and its processing. The most rational ways to increase the energy efficiency of mixing are to establish the dependences of energy consumption by mechanical mixing devices, to choose a rational type of mixer, which includes the search for rational mass-dimensional characteristics that ensure uniform flows of raw materials in the biogas reactor and at the same time spend the least amount of energy for mixing. Performing the above actions ensures the determination of rational mass-dimensional characteristics of the mixer, which significantly reduces energy consumption for mixing and increases the profitability of implementing biogas technologies into the energy system.
Originality. The types of electric machines used as electric drives of mixing devices are analyzed. Taking into account the control systems of electric drives and the cycle diagrams of their operation, as well as the features of mixing the substance, the change in the Euler hydrodynamic similarity criterion for different types of mechanical mixers with the same geometric parameters of biogas reactors, the levels of organic raw materials and the same speed mode of movement of the working body of the mixer, the power consumption for the technological process – mixing is established. A comparative analysis of the influence of the type and geometric dimensions of mechanical mixers on the energy consumption for mixing the volume of the substance in a closed tank when using a single-phase asynchronous motor as a mixer drive is carried out. Using a polynomial dependence, an equation was obtained that describes the change in the power of the electric drive from the change in the frequency of rotation of the working body of a two-tier mixer in which the blades are installed at an angle of 900.
Practical value. The results presented in the work can be used to increase the energy efficiency of biogas plants. The direction of further research on the consumption of reactive power by electric motors during the technological cycle of the mixer operation has been established, which will allow determining the pattern of changes in reactive power consumption and outlining the directions of movement towards its reduction.
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