Browsing by Author "Ovcharenko, Alina"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item type:Item,
    Effect of Vapor Treatment on the Caking Properties of Different Coal Types
    (MDPI AG, Basel, Switzerland, 2026) Koveria, Andrii; Saik, Pavlo; Polyanska, Alla; Ovcharenko, Alina; Usenko, Andrii Yu.; Pazynich, Yuliya
    ENG: Modification of the properties of caking coals through the methods of their treatment is of practical interest, especially in the context of deterioration of the raw material source for coke production and high requirements for the quality of coke. Considering the hydrophobicity of coals and their relatively high porosity, vapor treatment can be an effective method of influencing coal properties. Research on the properties of coal treated with water vapor and crude benzene vapor was conducted using different caking ability methods. Coal moistened to 10%wt. was also investigated for comparison. Four coal samples with varying degrees of coalification, ranging from medium to high rank (Ro = 0.76–1.50%) and characterized by volatile matter (Vdaf = 20.24–37.42%), were investigated. The mechanisms of interaction between coals and water in liquid and vapor form were determined. The results demonstrate that the treatment with water vapor and crude benzene significantly affects the properties of coal A. Specifically, under the influence of water vapor, there is a decrease in the period before the formation of plasticity and an increase in the caking properties of coal A. Coal B and C have good caking ability, so the effect of treatment is less noticeable. The treatment of the coal D leads to an increase in the viscosity of the plastic mass and a decrease in the caking properties. The approaches used in the study of the impact on coal properties can be effectively implemented in production conditions.
  • Thumbnail Image
    Item type:Item,
    Improvement of Energy Efficiency and Environmental Safety of Internal Combustion Engines by Using Binary Fuel Mixtures with Hydrogen
    (Ukrainian State University of Science and Technologies, Dnipro, 2025) Bartashevskyi, Stanislav; Koveria, Andrii; Ovcharenko, Alina; Mazorchuk, Volodymyr F.
    ENG: This paper addresses current issues related to improving the efficiency of fuel use in internal combustion engines and reducing the environmental impact of fuel combustion. It is demonstrated that incorporating hydrogen into mixtures with liquid fuels enhances the fuel’s energy potential and combustion completeness. This approach aligns with the goals of sustainable development by reducing reliance on liquid hydrocarbon fuels and mitigating the harmful effects of pollutant emissions. The study proposes producing hydrogen via chemical reactions directly at the point of use, in quantities required for operation. These reactions enable the use of readily available, non-toxic materials for the targeted generation of hydrogen and its incorporation into fuel mixtures. Calculations show that the energy consumption for decomposing 1 kg of water using diesel and AI-92 gasoline is 12.9 MJ/kg and 13.2 MJ/kg, respectively.