Aug 10, 2012
German company develops new electric arc furnaceBack
Engineering|Cleaning|Components|Energy|Gas|Materials Handling|Shell|SMS Siemag|SMS-Siemag|System|Water|RWTH Aachen University Institute|Cleaning|Electrode Slipping Device|Energy|Energy Costs|Integrated Energy Recovery System|Lower Energy Consumption|Materials Handling|Steel|Thermal Energy|Bernd Friedrich|Iron Ore|Power|Water|Arccess|Conarc Technology|SAF Technology
© Reuse this
German engineering company SMS Siemag has developed the Arccess steady electric arc furnace (S/EAF), which allows continuous operation for up to one week.
EAFs are the core units of an electric steelmaking plant and have a significant impact on production and energy costs.
The development of the S/EAF arose from SMS Siemag’s long-standing experience in the fields of submerged-arc furnaces (SAFs), EAFs and its Conarc technology.
The result is a new type of EAF that yields 30% higher productivity with lower energy consumption because of its reliable continuous process. The integrated energy recovery system further improves efficiency by using the thermal energy of the hot furnace offgases.
All components have been designed to allow for continuous power-on operation for about one week. Uninterrupted operating practice is made possible by a patented system derived from SAF technology, which enables the electrodes to be clamped and slipped continuously. Whenever an electrode has been used up, a fresh piece of electrode is joined at its end. Both operations take place under ‘power-on’ settings.“
Continuous operation in SAFs is only possible by the electrode slipping device.
“That this principle will now be transferred into the new S/EAF is a real innovation and it definitely results in increased efficiency,” says RWTH Aachen University Institute for Machine Elements and Machine Design professor Bernd Friedrich.
Similarly, with the operation of an SAF, the process takes place in a uniform way and is almost free of fluctuations, since the S/EAF is operated continuously in the flat bath phase.
The geometry of the new furnace shell has been improved accordingly and comprises a flat lower shell and a conical furnace roof placed closely on top.
The S/EAF is continuously charged with direct-reduced iron-ore/hot briquetted iron (DRI/HBI), hot metal or scrap through a materials handling system that is also rated for the use of 600 °C hot DRI.
In addition to the electrodes, water-cooled oxygen-blowing lances are introduced through the furnace roof. This technology has been adopted from Conarc – a furnace unit developed by SMS Siemag with the aim to rapidly decarburise melts with a high carbon content. The level of foaming slag is controlled by a new, patented slag door system. The steel is tapped slag-free and under ‘power-on’.
Since the S/EAF is not opened during operation, no roof hood for the secondary gas collection is needed. Primary gases are directly exhausted through a furnace nozzle. This allows the connected gas cleaning plant to have smaller dimensions.
The power-off times that previously affected the EAF no longer arise, states SMS Siemag.
Continuous operation is interrupted only for regular maintenance work. For that purpose, the lower furnace shell can also be driven to a maintenance stand. No heavy-duty gantry cranes, elaborate building structures or foundations are needed.
The steady input of electrical energy and the flat-bath process prevent negative feedback on the electricity grid. Further advantages are the protection of the refractory lining and lower specific electrode consumption.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines
Other Foundries, Forges and Die-Casting News
A new modular oven and operator panel with a colour display is being offered by global technology group Siemens’ Industry Automation Division for its Maxum Edition II gas chromatograph, used to separate and analyse gas by chromatography.
British technology company Dyson says its patented Airblade hand dryer is the first hand dryer to earn the Carbon Reduction Label from nonprofit organisation Carbon Trust.
Updated 2 hours 33 minutes ago President Jacob Zuma announced the composition on Wednesday of the ‘Energy Security Cabinet Sub-Committee’, which he said would oversee the development of South Africa’s future energy mix. Delivering his Budget Vote in the National Assembly, Zuma said the...
Updated 2 hours 34 minutes ago Consulting Engineers South Africa (Cesa) on Wednesday stated that it welcomed government’s move to lead municipalities back to basics and to put in place institutional mechanisms to enable them to deliver core municipal services, as announced by Cooperative...
Updated 2 hours 55 minutes ago JSE-listed construction firm Group Five on Wednesday announced that it expected its fully diluted headline earnings per share (HEPS) for the year ended June 30 to be between 20% and 30% higher, at 382c to 414c, than the fully-diluted HEPS of 318c achieved during the...
Recent Research Reports
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
Real Economy Insight: Steel 2014 (PDF Report)
This four-page brief covers key developments in the steel industry over the past 12 months. It provides an overview of the global and South African steel and stainless steel markets, South Africa’s major steel producers and events that have shaped these markets.
This Week's Magazine
Local aerospace company Denel Aerostructures (DAe), part of the State-owned Denel Group, has won a fourth contract to manufacture parts for the Airbus A400M military air transport and air-to-air refuelling aircraft. The new contract, which was won in an international...
Although CEO Mark McChlery and chief marketing officer Bob Skinstad likened themselves to children in a playground when taking on the task of “reengineering and repositioning” the Seartec brand, the “young, dynamic and enthusiastic guys” were like proud...
An increasing number of buyers, in both the new and used car markets, are opting for finance structures that lower their monthly repayments, says asset financing company WesBank. These include the use of large balloon payments (also known as residuals), as well as...
Tertiary education institutions can use search engine giant Google’s Chromebook to provide secure mobile end-point devices for students on which they can share documents, work collaboratively on documents and access education materials and applications being used...
Local ceiling and partition company Abbeycon has beaten global competition at the Saint-Gobain Gypsum International Trophy competition, which was held last month in Berlin, Germany.
Next ArticleR&D initiative to solve refractory problems