problems with dc arc furnace technology


  • Danarc technology for electric arc furnaces

    Danarc electric arc furnace technology combines high-impedance technology with bottom tuyeres for oxygen and carbon injection. Together with lance injection and wall burners for both conventional operation and post-combustion, the concept provides full flexibility in the choice of energy sources. The basic philosophy of the concept is to have ...

  • Pyrometallurgical recovery of cobalt from waste …

    DC-plasma arc furnace was used to reduce slag to recover cobalt at about. 13.5kV A power input. The major part of the study was conducted in a tube furnace and the findings were applied to the extraction of cobalt from slag using the plasma-arc furnace.

  • DC Furnace Arc Problems

     · 12 Jun 03 20:24. I work in a structural steel mill which uses a DC Electric Arc Furnace (13.8 kV). We have been having problems for quite some time with the electrode arcing to the furnace roof and damaging the water cooled panels. I am currently researching ways that I can electrically isolate the roof from the body of the furnace.

  • AC and DC EAF | TENOVA

    AC and DC EAF. A modern EAF is a concentrate of technology combining knowledge from different fields, Tenova offers the market some of the most advanced solutions for EAFs leveraging on a holistic approach to the steelmaking process. Complete furnace packages are supplied providing equipment for all the charging mix alternatives including DRI ...

  • Engineering-Scale DC Arc Furnace Testing Summary

    Technology (MIT) and Electro-Pyrolysis, Inc. (EPI). Those three organizations pooled their efforts in order to demonstrate the technology using the graphite electrode DC arc furnace for treatment hazardous waste. Electro-Pyrolysis, Inc., the industrial participant

  • problems with dc arc furnace technology

    DC ARC FURNACES – PAST, PRESENT, AND FUTURE Significant commercialisation of DC furnace technology occurred in the 1990s, when there was a huge demand for DC arc furnaces for steel scrap melting, following the development of high-power solid-state ...

  • Pilot plant production of ferronickel from nickel oxide …

     · The development and various advantages of the DC-arc furnace technology developed at Mintek has previously been described in detail (Jones et al., 1993; Lagendijk et al., 1994). In essence, nickel-containing lateritic material, together with a carbonaceous reducing agent is fed onto the uncovered molten bath of a typical DC-arc furnace.

  • Electric Arc Furnace Design Operation and Working …

     · Electric Arc Furnace Working Principle and Operation. Electric arc furnaces work on the principle of the electrode forming an arc between itself and the top layer of metal to be melted. The operation begins with a delivery of steel scrap to the scrap bay, located at one end of the EAF building. The scrap comes in many forms, from shredded ...

  • IJERT – International Journal of Engineering Research & Technology

    2. Power quality iIssues in Electric Arc Furnace The perturbations caused by electric arc furnaces are of random nature and it varies from a frequency range of DC to a few hundreds of Hz. Depending on power supply (AC or DC) of EAF, there are

  • Direct Current (DC) Arc Furnace | Industrial Efficiency …

    Direct Current (DC) Arc Furnace This arc furnace achieves an energy savings of approximately 5% in terms of power unit consumption in comparison with the older designs of 3-phase AC arc furnaces. In addition, it also has other features, including higher melting efficiency and extended hearth life.

  • RECOVERY OF VALUABLE BASE METALS FROM SECONDARY MATERIALS USING DC …

    Tetronics'' DC Plasma Arc technology is one of several pyrometallurgical solutions available for the recovery of valuable base metals from secondary sources, the other key ones being shaft furnace and submerged arc furnace smelting. Shaft furnaces and ...

  • Demystifying the world's largest 420-ton DC arc …

     · The main technical parameters of the DC arc furnace are shown in Table 1. The power supply of this DC arc furnace is composed of a transformer, a thyristor, a DC …

  • DC Arc Furnaces

    DC Arc furnace is the most versatile means for melting ferrous metals. Until recently, AC Arc Furnaces were used for melting as generation & distribution of AC power was convenient. But with the progress in thyristor Technology, DC Supply has become a genuine alternative to AC Supply.

  • Implementation of a Novel Technology for the Recovery of Cobalt from Copper Smelter Slags

    In January 2001, Chambishi Metals commissioned a 40MW DC arc furnace using selective carbothermic reduction for processing reverberatory furnace slag stockpile of 20 million tons containing 0.34 to 4.5% cobalt, and an average of 1.1% copper.

  • Rolling Mill Production Line: The Advantages of DC …

     · Today I will introduce the advantages of DC electric arc furnace. It is the same as AC electric arc furnace, which uses the arc generated between the electrode and the charge (or molten pool) to generate heat, so as to achieve the purpose of melting, and can be used to melt steel or alloy. (3) Less electrode loss, 50% less electrode consumption ...

  • DC Electric Arc Furnace – IspatGuru

     · Some feel that the possibility for increased automation of EAF activities is greater for the DC furnace. This is because with only one electrode, there is increased space both on top and within the furnace. DC furnace is expected to cost from 10 % to 35% more

  • A new process for the thermal refining of zinc: A case study of technology …

    DC arc furnace technology for the metallurgical industry. This includes the patented Enviroplas® process for the treatment of zinc bearing waste materials1–8. As a consequence Mintek has developed extensive expertise in the pyrometallurgical processing of zinc

  • A novel feeding topology for DC electric arc furnaces …

     · Furthermore, the proposed power supply system is free of any current/power-sharing problems, and only one proportional-integral controller is sufficient to control the DC arc …

  • problems with dc arc furnace technology

    RECOVERY OF COBALT NICKEL AND COPPER FROM SLAGS USING DC-ARC FURNACE TECHNOLOGY. R.T. Jones D.A. Hayman and G.M. Denton. Pyrometallurgy Division Mintek Private Inquiry Online TIG ...

  • How To Make An Electrical Arc Furnace

     · How to hack flashlight batteries and a fire brick, into a desktop arc reaction chamber. ...For hobby metal melting, and for science!Some quick links to a fe...

  • Technology Expertise

    SHORT DC ARC TECHNOLOGY developed by Keech Furnace Technologies is called brush arc technology. The arc only "brushes" the charge and is typically between 2mm and 10mm in length. The advantage of this technology is that little energy is lost during the smelting process resulting in lower energy consumption therefore more cost effective and increases production.

  • Demystifying the world's largest 420-ton DC arc …

     · In recent years, due to the development and application of high-power thyristor technology, DC arc furnace has re-emphasized people''s attention. …

  • DC ARC FURNACES – PAST, PRESENT, AND FUTURE

    Significant commercialisation of DC furnace technology occurred in the 1990s, when there was a huge demand for DC arc furnaces for steel scrap melting, following the development of high-power solid-state rectifiers. Around that time, about 80 DC arc furnaces

  • Electric Arc Furnace: Advantages of DC Arc Furnace

    The maintenance and service life of the contacts are the key problems in the operation of the DC arc furnace. Generally, copper plate is placed on the steel plate at the bottom of the furnace …

  • Assessment of Plasma Arc Technology for Processing of …

    Plasma arc (PA) technology has been used predominantly for steel making in electric arc furnaces. Several commercial-scale facilities were built as the result of efforts in the early 1970s to use PA for processing hazardous waste, including low-level mixed

  • Modeling of a DC Electric Arc Furnace—Heat Transfer from the Arc

    Modeling of a DC Electric Arc Furnace—Heat Transfer from the Arc Jonas ALEXIS, Marco RAMIREZ1), Gerardo TRAPAGA1) and Pär JÖNSSON2) MEFOS, Box 812, SE-97525 Luleå, Sweden. Also, a graduate student at the Div. of Metallurgy, Royal Institute of

  • Optimization of the Electric Arc Furnace Transformer Power

     · We now consider the problems of choosing the large-capacity EAF transformer power. Since the total transformer power is St = sqrt 3 UtI2, where Ut is the linear value of the secondary transformer voltage and I2 is the arc current, the power introduced into a furnace (transformer power) can be increased by increasing the voltage or the current.

  • High productivity with ELECTRIC ARC FURNACES

    SMS Demag Electric Arc Furnaces DESIGN FEATURES 4 SMS Demag Electric Arc Furnaces are known worldwide for their availability and robustness. Our furnace design reflects constant improvements and responds to our customers'' demands. High productivity

  • AC

    AC- AND DC- SMELTER TECHNOLOGY FOR FERROUS METAL PRODUCTION Dr. G. Kleinschmidt, Dr. R. Degel, M. Köneke, H. Oterdoom SMS SIEMAG AG Eduard-Schloemann-Strasse 4 Düsseldorf, Germany ABSTRACT In 1906, the first submerged arc

  • Low cost ferroalloy extraction in DC-arc T furnace at Middleburg …

    MW DC-arc furnace with a DC power supply for the smelting of Transvaal chromite ore fines. With the benefit of 12 years'' experience with this technology while operating a 44 MW DC-arc furnace, MFC mitigated all known challenges and considered up-scaling ...

  • A fault analysis of DC electric arc furnaces with SVC …

     · Measurement data of the DC arc furnace The plant operates without the 2nd harmonic filter, because of the frequent failures on it. It had been expected that these failures resulted in a large amplification of the 2nd harmonic current due to the parallel resonance between the filters and the transformer TR-B.

  • DC arc furnaces – The story of a successful South African technology

    DC arc furnaces for melting metals date back to 1878 •Sir William Siemens used a DC arc furnace in 1878 with a vertical graphite cathode, with the arc transferred to the melt in contact with a …

  • Investigation of Voltage Unbalance Problems In Electric …

    References 1. Fenghua W., Zhijian J., Application of Extended Kal-man Filter to the modelling of Electric Arc Furnace for Power Quality Issues, IEE E Transactions on Power Delivery, 2005, 10(4), p. 991-996. 2. Carpinelli G., Iacovone F., Russo A., Varilone P., Chaos-based modelling of DC arc furnaces for power quality issues, IEE E Transactions on Power Delivery, 2004, 19(4), p. 1869-1876.

  • POLAR FURNACE TECHNOLOGIES – High End DC Arc …

    Polar Furnace Technologies was created to set standards through innovative products, state-of-the-art technology, comprehensive service and maximum flexibility. The company''s competence consists on the one hand of its mastery in DC plasma arc furnace technology and on the other hand of its know-how in designing custom-tailored system solutions for use in these fields.

  • The Differences in an AC Vs. DC Arc Furnace | eHow

     · DC furnaces are more expensive to purchase. For instance, an AC furnace will be about $3,000,000 cheaper than a DC furnace, but the DC furnace saves money in the long run. Unlike AC furnaces, it doesn''t require burners, which cost about $500,000 each, and the overall energy consumption is less, so utility costs are lower.

  • Electric Arc Furnace Design, manufacture, Install "Turn …

    Electric Arc Furnace New Technology: 1. Optimization design 2. Tubular water cooled furnace wall and furnace lid Eccentric bottom tapping (EBT) Copper-steel combined electrode arm 3. Cluster type large sectional area water cooled cables Optimize large

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