Volchanska Kateryna

@znu.edu.ua

Асистент кафедри Електричної інженерії та кіберфізичних систем Інженерний навчально-науковий інститут ім. Ю.М. Потебні
Запорізький національний університет

Volchanska Kateryna


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https://researchid.co/volchanska

RESEARCH, TEACHING, or OTHER INTERESTS

Engineering, Energy Engineering and Power Technology, Artificial Intelligence, Modeling and Simulation
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Scopus Publications

Scopus Publications

  • Study of the cascade system model for waste heat recovery from the flue gases of the electric arc furnace
    К. Volchanska, A. Yerofieieva, О. Barishenko, A. Vlasov, М. Ivchenko, А. Yeremenko
    International Journal of Thermofluids, 2025
    The paper deals with methods for recovering a significant part of the thermal energy consumed by the metallurgical industry and discarded as waste heat from the electric arc furnace. One of the main sources of heat removal from an electric arc furnace is the emissions of high-temperature waste gases. The use of waste heat recovery methods allows the energy efficiency of the technological process to be increased, operating costs for steel production to be reduced, and also hazardous emissions into the environment to be reduced. The study was conducted in an ultra-high-power electric arc furnace along with preheating of steel scrap in a closed container using residual heat from flue gases. The temperature of the flue gases and the flow velocity profiles of the electric arc furnace were obtained experimentally and used as the basis for developing the cascade system model for the waste heat recovery from the flue gases. The novelty of this study is in the development and modeling of a combined cascade system for waste heat recovery from the flue gases of a powerful electric arc furnace (EAF), which includes three daisy-chained energy subsystems: a steam Rankine cycle (RC), an organic Rankine cycle (ORC) and a heat pump (HP) system. The proposed multi-stage structure of the system provides a step-by-step decrease in the temperature of flue gases and an effective heat transfer to several independent energy flows. This ensures the increased flexibility of the system, reduced energy losses and adaptability to the cyclic operation mode of the furnace. In this study, exergy analysis was used for the first time to set the tasks in the form of variational inequalities, reflecting the distinct dissipative properties of materials associated with energy losses. Usage of variational inequalities allowed us to build a mathematical model that adequately describes the recovery process, taking into account losses and limitations. The simulation results showed a reduction in electricity consumption by 40–50 kWh/t (saving approximately 8–12 %), a reduction in melting time by 5–8 min (reduction by 10–15 %), and a reduction in electrode consumption by 0.2–0.4 kg/t (saving approximately 7–12 %). The heat efficiency of the electric arc furnace increased by 70 %. Experimental studies confirmed the adequacy of the proposed strategies and calculations.