Magnetic field modelling of a Direct Current Electric ARC Furnace

by Masoud Sharifi

Publisher: National Library of Canada in Ottawa

Written in English
Published: Downloads: 493
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Edition Notes

Thesis (M.A.Sc.) -- University of Toronto, 1994.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative. --
ID Numbers
Open LibraryOL17054880M
ISBN 100315962100
OCLC/WorldCa46523350

The present invention is applicable to such electric furnaces and in particular to an alternating current direct arc electric furnace equipped with three electrodes powered by three phase alternating current to establish arcs passed from an electrode to a metal charge to another electrode and from electrode to electrode. The direct-arc. The dual-electrode direct current (DC) arc furnace uses two graphite electrodes, one connected as cathode and one as anode. Such an the pinching of the electric and magnetic fields results in a force on the plasma gas directed The dual-electrode DC arc furnace–modelling insights T r .   Current induced magnetic fields depend more on the wire placement than on the current flow. Parallel cables are very good at cancelling each out out, so only a tiny fraction of the field is radiated more than a couple inches from the wire. On the other hand, a big loop makes a very good broadcast antenna. everyone's life -- he perfected his invention -- the electric light bulb. Prior to , direct current (DC) electricity had been used in arc lights for outdoor lighting. In the lates, Nikola Tesla pioneered the generation, transmission, and use of alternating current (AC) electricity, which can be transmitted over much greater distances.

  Back in the day (s) we didn't have very strong permanent magnets available, so I didn't have an opportunity to discover what effect a strong magnetic field would have on the arc. The buoyancy, created by the heated air of the arc, was a much stronger force than the Lorentz force created by the puny magnetic fields available to me at the time.   There are several open source packages that have solvers for magnetostatics. 1. MaxFEM (MaxFEM) 2. ELMER (Elmer finite element software) 3. OpenFOAM (Standard Solvers -- included the static magnetic solver) For high frequency problems, FDTD (Fini. As the copper passes through the magnetic fields an electric current is induced within the copper. You can read more about electric motors in our blog. Four or more magnets with an equal number of north and south polarity on the inner radius can be used to create a multi-pole ring. All arc magnets are available with either pole on the inner radius.   Constituencies ranging from recycling advocates to stock analysts to executives of scrap-fed electric arc furnace (EAF) steelmaking firms have long held that the EAF sector is well positioned to compete in a fast-changing global economy. The roiling of global markets by the COVID coronavirus seems to be bolstering that point of view.

  Electric Arc Furnace: June, The function of the magnetic yokes is to confine the magnetic field produced by the induction coil 3 and prevent it from This is achieved by means of an additional insulated electrode 11 that extends through the bottom of the furnace. A low DC current or AC current of a low voltage source 13 is passed. - current induced into the shaded pole from the main windings, which reaches its peak at a different time than the rest of the iron core, this creates the rotation and starts the motor. The poles of the motor create a rotating magnetic field that continues rotation.   This equation solves for the electric potential field, V, which gives us the electric field, \mathbf{E} = -\nabla V, and the current, \mathbf{J} = \sigma \mathbf{E}.This equation can be solved with the core COMSOL Multiphysics package and is solved in the introductory example to the software. The AC/DC Module and the MEMS Module extend the capabilities of the core package, for example, by. The arc current changes at a frequency of 50 Hz. Figure 3, a shows one arc cycle in glowing onto a liquid metal bath. An arc current creates a magnetic field, which generates a compressive pressure on the arc column that is ra-dially directed from the outer surface of the arc column of r a radius to its axis. Compressive pressure com at r f.

Magnetic field modelling of a Direct Current Electric ARC Furnace by Masoud Sharifi Download PDF EPUB FB2

Keywords: Electric arc furnace, EAF, electromagnetic stirring, CFD, flow modeling Abstract Electromagnetic stirring can play an important role in modern Electric Arc Furnaces (EAF), as they often operate far from equilibrium conditions, with tap-to-tap times of 45 minutes or less, high electric power input and significant.

Magnetic fields in industry: arc furnace Abstract: Interest in magnetic fields of electric power systems in a working environment have increased during the past few years.

Reasons for this are public concern about the possible health risks that the fields may cause and disturbances in appliances caused by the magnetic fields. 2. Magnetic field measurement.

Let I arc be the current flowing through the conductor that generates the arc in the EAF, D the distance from the measurement place and μ o, the magnetic permeability of free space, the magnetic field generated on a point in the space is then defined by Eq.: (1) B = μ o I arc 2 π DCited by: 1.

– The purpose of this paper is to present a 3D finite element model of the electromagnetic fields in an AC three‐phase electric arc furnace (EAF). The model includes the electrodes, arcs, and molten bath., – The electromagnetic field in terms of time in AC arc is also modeled, utilizing a 3D finite element method (3D FEM).

The arc is supposed to be an electro‐thermal Cited by: 3. The article is aimed: 1) to develop a mathematical model and to determine the dynamic parameters of a mechanical system of balanced electrode holder of electric arc furnace; 2) to perform a. Interest in magnetic fields of electric power systems in a working environment have increased during the past few years.

Reasons for this are public concern about the possible health risks that the fields may cause and disturbances in appliances caused by the magnetic fields. New guidelines being prepared, e.g., ICNIRP (International Commission on Non-Ionizing Radiation Protection). where E is the electric field (V m −1), B is the magnetic field (T), σ is the electrical conductivity (S m −1) and μ 0 is the magnetic permeability (H m −1).

Ohm's Law for a fluid with a velocity field u inside a magnetic field is described by equation (). The first term on the right-hand side of equation () is due to the applied. A two-dimensional mathematical model was developed to describe the heat transfer and fluid flow in an AC arc zone of a ferrosilicon submerged arc furnace.

In this model, the time-dependent conservation equations of mass, momentum, and energy in the specified domain of plasma zone were numerically solved by coupling with the Maxwell and Laplace.

Abstract: This paper investigates the modelling and control of the electric energy input of a three-phase electric arc furnace (EAF) using electrode position control as the main control strategy. Two methods to keep the electrical energy input constant at a known set point value are to control the arc-current or the arc.

Direct current (DC) arc furnaces have been used extensively in the steel recycling φ is the electric potential field, A. is the magnetic vector potential field, and µ representing a “slice” through the furnace centreline. The model geometry is shown in Fig. viscosity, j is the electric current density vector, and B is the magnetic field.

The heat transfer model is similarly derived by assuming constant properties and making use of the local thermodynamic equilibrium approximation[7], by which a single temperature can be used to characterise the material's properties. Effective Magnetic Shielding in Electric Arc Furnace Transformers Using Interphase Wall Shunts Masood Moghaddami 1, Arif I.

Sarwat 1Department of Electrical and Computer Engineering, Florida International University, Miami, USA Abstract—Magnetic shielding in electric arc furnace (EAF) transformers is of a great importance for stray loss reduction. Modeling voltage-current characteristics of an electric arc furnace based on actual recorded data: A comparison of classic and advanced models Abstract: Field measurements of voltage and current is the most effective way for characterizing the electric response of an EAF that describe the nonlinear behavior of AC EAF loads.

The relative errors of the method do not exceed % for the magnetic field energy, % for the electrical loss, % for the voltage drop modulus, and % for the voltage drop phases compared with the numerical values from field simulation of the furnace loop electric circuit.

Electric Arc Furnace An EAF is a type of electric furnace, which is used for melting of metals. The operating mechanism is that an electrical energy converted into heat in an electric arc between is electrodes. This assists in heating and melting of the metal. MODELING METHOD. AC Electric arc Mathematical Furnace Model.

According to the analysis in [7], the EAF arc energy equation which describes the relationship of arc current and arc radius is. 3 2 12 2 n m dr k kr kr i dt r + += (1) where i is the arc current; is the arc radius; r 1, k.

2, k. 3, m, n. are variables. When the. arc. furnace. The effect. electrode phase. rotation with unbalanced. electrode. currents on the.

induced. losses is shown. This study indicates the direct. similarity. between the induced loss distribution and the nonlinear. refractory. wear pattern in a furnace. Experimental results on a. furnace. model are. included.

to support the. This article is devoted to the numerical modeling of electrovortex and convection flows in the direct current (DC) electric arc furnace with a different position of the bottom electrode. The article is devoted to the numerical modelling of electrovortex and convection flows in DC electric arc furnace with the cooling bottom electrode.

The shear stress on the fettle area are offered as criteria for the estimation of vortex flows influence on the increased wearing of fettle. Electric arc furnace In steel industry, integrated steel mill and electric arc furnace (EAF), referred to as mini-mill, are two steel production routes.

In integrated mill, iron ore is the primary raw material which is charged to blast furnace (BF), whereas mini-mill is charged by almost % scrap. The exponential growth of computing power in the last two decades opens up entirely new options for numerical simulations of the Electric Arc Furnace (EAF).

Simulations can be used to analyze physical phenomena resisting direct observation or operational measurement even. THE ELECTRIC ARC MODEL The electric arc furnace is a nonlinear and unbalanced high power three-phase charge.

In simulations were used a model based on relations between arc radius/length, the arc voltage and the current. This model was presented in [11], [12] and used by authors in [17] and [18]. It consider that the arc voltage-current.

Keywords: Furnace, Plasma Arc, Control, Measurement, Modelling Abstract A direct-current (DC) plasma arc furnace is a type of electric furnace used for metallurgical operations. The successful operation of DC furnaces depends to a large extent on gaining a transfer model, and an electromagnetic field model.

Together these form an MHD system. Calculating Magnetic Fields of Short Current Segments. A short wire of length carries a current of in the vertical direction (Figure ).

The rest of the wire is shielded so it does not add to the magnetic field produced by the wire. Calculate the magnetic field at point, which is from the wire in the. Applications of the direct current (DC) arc furnace as a metallurgical unit operation may be found in a significant with a discussion of various levels of coupling between the dust field and the arc plasma gas.

The model is then used to magnetic field vector. The conservation of. The electric arc furnace operating cycle is called the tap-to-tap cycle and is made up of the following operations: Furnace charging Melting Refining De-slagging Tapping Furnace turn-around Modern operations aim for a tap-to-tap time of less than 60 minutes.

Some twin shell furnace operations are achieving tap-to-tap times of 35 to 40 minutes. Ørsted's discovery in that a magnetic field existed around all sides of a wire carrying an electric current indicated that there was a direct relationship between electricity and magnetism.

Moreover, the interaction seemed different from gravitational and electrostatic forces, the. Modeling of Three Phase Electric Arc Furnaces.

Manuela PĂNOIU, Caius PĂNOIU and Ioan ŞORA. Abstract. In this paper are study the modeling of a three phase electric arc furnace installation. It is well know that the electric arc is a nonlinear element. Thus, for modeling his behavior, the authors are using a.

turns ratio of the auxiliary CT. The arc furnace inrush current has both a dc component and ac magnitudes that vary between phases, as described in the “Inrush on an Electric Arc Furnace” section. This causes the CTs to behave differently from one another and results in a false residual current, as seen in Figure 4 and Figure 6.

Magnetic field due to a moving charge (Biot-Savart law) is: B = (μ o /4π) × Idl (sinθ)/r 2; Learn more about the Motion in Combined Electric and Magnetic Field.

Differences. The source of the electrostatic field is scalar in nature. Whereas, the source of the magnetic field, which is the current element (Idl), is a vector in nature. We have seen that a charged object produces an electric field E G at all points in space. In a similar manner, a bar magnet is a source of a magnetic field B G.

This can be readily demonstrated by moving a compass near the magnet. The compass needle will line up along the direction of the magnetic field produced by the magnet, as depicted in.Sir Charles Oatley Electric and Magnetic Fields (an introduction) Cambridge University Press Acrobat 7 Pdf Mb.

Scanned by artmisa using Canon DRC + flatbed option.Magnetic Field from an Arc of Current. What is the magnetic field at the center of an arc of current of radius R?

The arc curves through an angle θ. If the current is counter-clockwise the magnetic field at the center is out of the page. The magnetic field dB from a representative piece of the wire is.