Selecting the Calculation Procedure and Studying the Electrical Characteristics of Induction Crucible Furnaces with a Conductive Crucible

  • Максим [Maksim] Андреевич [A.] Федин [Fedin]
  • Александр [Aleksandr] Борисович [B.] Кувалдин [Kuvaldin]
  • Алексей [Aleksey] Олегович [O.] Кулешов [Kuleshov]
Keywords: induction crucible furnace, conductive crucible, calculation methods, mathematical and physical modeling, electrical characteristics

Abstract

The known procedures for calculating induction crucible furnaces with a conductive crucible are reviewed and compared with one another. It is shown that the electric and power performance characteristics of furnaces of this type can be efficiently calculated and theoretically studied by computer simulation based on the finite element method and implemented in the ELCUT universal software package. The results from electric calculation of a laboratory furnace with a graphite crucible and with aluminum alloy charge carried out using different methods are compared with one another, and the effectiveness of using the ELCUT software package has been demonstrated from that comparison. A laboratory electrical processing facility comprising an induction crucible furnace with a conductive crucible, an adjustable high-frequency transistor inverter serving as a power supply, a microprocessor control system, and a data acquisition system has been set up. The techniques for measuring electrical quantities at high frequency that have been implemented in the laboratory setup are described. The modelling has been carried out at the experimental setup fitted with the necessary instrumentation. The calculation results are compared with the physical experiment data, and adequacy of the theoretical investigation has been confirmed by experiment. The laboratory furnace equipped with a graphite crucible intended for melting 1 kg of copper by heating it to 1100 °C using a current frequency of around 22 kHz has been calculated. The electromagnetic wave penetration into the furnace charge presenting a double-layer conductive body (with the conductive crucible forming the external layer and the metal being melted forming the inner layer) has been investigated. The effect the presence of the charge inner layer on the furnace electrical and power performance characteristics has been investigated. The dependences of electric and power performance characteristics on the frequency, inductor current and temperature, as well as the distribution of magnetic field intensity over the radius and specific volumetric power release in the crucible and charge for the empty crucible and the crucible with liquid copper have been studied. The calculation results were also compared with the experimental data. The performed investigations form the basis for designing induction crucible furnaces with a conductive crucible and also for constructing the control system.

Information about authors

Максим [Maksim] Андреевич [A.] Федин [Fedin]

Science degree: Ph.D. (Techn.)

Workplace Power Supply of the Industrial Enterprises аnd Electrotechnologies Dept., NRU MPEI

Occupation Assistant Professor

Александр [Aleksandr] Борисович [B.] Кувалдин [Kuvaldin]

Science degree: Dr. Sci. (Techn.)

Workplace Power Supply of the Industrial Enterprises аnd Electrotechnologies Dept., NRU MPEI

Occupation professor

Алексей [Aleksey] Олегович [O.] Кулешов [Kuleshov]

Workplace Power Supply of the Industrial Enterprises аnd Electrotechnologies Dept., NRU MPEI

Occupation Ph.D.-student

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Для цитирования: Федин М.А., Кувалдин А.Б., Кулешов А.О. Выбор методики расчета и исследование электрических характеристик индукционных тигельных печей с проводящим тиглем // Вестник МЭИ. 2017. № 3. С. 77—86. DOI: 10.24160/1993-6982-2017-3-77-86.
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For citation: Fedin М.А., Kuvaldin А.B., Kuleshov А.О. Selecting the Calculation Procedure and Studying the Electrical Characteristics of Induction Crucible Furnaces with a Conductive Crucible. MPEI Vestnik. 2017; 3:77—86. (in Russian). DOI: 10.24160/1993-6982-2017-3-77-86.
Published
2019-01-15
Section
Electrical Engineering (05.09.00)