REBOX - Oxyfuel Solutions for Reheating

REBOX® offers more capacity with less emission to any new or existing furnace by: Through put (tonne/hour) increased up to 50% Fuel savings up to 50% Corresponding 50% reductions of CO2 NOx emissions below 70 mg/MJ.

Experience and Technical Lead

Since 1990, Linde has supplied 115 REBOX oxyfuel based solutions to batch and continuous reheat furnaces for rolling mills and forge shops as well as for annealing furnaces. Linde has not only the experience from all these installations, but is also a forerunner in combustion technology development in this area.

State of the art technologies including so called flameless combustion and direct flame impingement have been brought to full scale installed customer solutions since 2002.


Oxyfuel Has No Nitrogen Ballast

Combustion is all about fuel, oxygen and ignition. Air contains only 21% oxygen, the remaining 79% is ballast, practically nitrogen. In combustion processes, all this ballast is negative, it does not take part in the combustion, but has to be heated up, consuming unnecessary extra fuel.

The ballast also has to be transported by electrical blowers, through oversized ducting and burners in long furnaces and flue gas systems that are much larger in size than with using only oxygen. This has a negative impact on the capital requirements and using air will substantially increase the production of NOx.

It has been clearly demonstrated in practice that if oxygen, not air is used to combust a fuel, all the heat transfer mechanisms, convection, conduction and radiation, can be promoted at the same time.

This results in a faster, more even heating process, which cuts the total heating time thus allowing for more production capacity and flexibility. The flue gas volumes are reduced by up to 80% with no more need for bulky flue gas systems or recuperators.


Turnkey and Complete Scope of Supply
 
Linde has the experience and organisation to deliver complete turnkey installations including engineering, project handling, revamping and commissioning.

The REBOX portfolio includes equipment and control systems for oxygen-enrichment, oxygen-lancing, oxyfuel-boosting and 100% oxyfuel operation in reheat furnaces and annealing lines.

Linde develops and produces powerful, compact and rugged oxyfuel burners needed to retrofit in existing furnaces. The efficient oxyfuel technology makes it possible to replace a 2 MW airfuel burner with a more compact REBOX burner of 1.3 MW, still allowing for an increased production capacity.

The control system handles all aspects of operation, safety, optimum heating and energy usage.

Find out more about REBOX customer installations and the technology in use: REBOX - Publications: Articles 30% Increased Capacity in Metal Coating Lines at ThyssenKrupp Steel - Iron & Steel Technology, May, 2010 Results from 120 Oxyfuel Installations in Reheating and Annealing - Heat Processing, November, 2009 Direct Solution Treatment for Efficient Annealing - Stainless Steel World, October, 2009 Direct Flame Impingement Oxyfuel for Enhanced Strip Processing - Ironmaking & Steelmaking, October, 2009 Installation in Rotary Hearth Furnace at ArcelorMittal Shelby - Iron & Steel Technology, September, 2009 Interview with Joachim von Schéele in Iron & Steel Today Energieeffizienz und Minderung des CO2-Ausstoßes durch Sauerstoffverbrennung, article in Stahl und Eisen REBOX HLL at SSAB - NS&MR 2009 Less Fuel, CO2 and NOx but Higher Production - Metals 2009, Czech Republic Flameless Oxyfuel Low Calorific Gases - NS&MR 2008 Flameless Oxyfuel for More Production Less CO2 and NOx - Stahl und Eisen 2008 Feature article on flameless oxyfuel - Iron & Steel Today, July, 2008 SCANMET conference presentation on modern combustion technologies 13 years with oxyfuel reheating at Ovako - Iron & Steel Technology, May, 2008 Ascométal paper at ATS 2007 State-of-the art oxyfuel solutions. For reheating and annealing. Furnaces in Steel Industry - Dr. Ing Axel Schrello State-of-the art oxyfuel solutions. For reheating and annealing. Furnaces in Steel Industry - Dr. Ing Axel Schrello (slides) DFI oxyfuel presentation at ATS 2006 Utilização do processo oxi-combustível, ABM Curitiba, Brasil, 17-20 Outobro, 2006 Oxyfuel impact on scale formation, Steel Rolling 2006, Paris, France Flameless oxyfuel, AISTech 2006, Cleveland, USA Oxyfuel at Ovako, Sweden, Steel Rolling 2006, Paris Oxyfuel article, ENERGY nr 1, 2005 (in German) Article on flameless oxyfuel, Nordic Steel & Mining Review, 2005 Oxyfuel article, Iron & Steel Technology, May 2005 Oxyfuel article, Gaswärme International Nr 3, 2005 (in German) Boosting heating capacity using new technology 2004 Short term opportunities for decreasing CO2, SCANMET 2004 Presentation at ATS Paris, December 2004 (In French) Presentation at Riva del Garda, September 2004 Comparison of Flameless Oxyfuel and Regenerative Technology 2004

REBOX - Publications: Customer Reference Sheets ArcelorMittal Shelby, US ASCOMETAL, Fos-sur-Mer, France ThyssenKrupp Steel, Finnentrop Reiner Brach Pit furnace Bruderus Pusher furnace NAF Box furnace Ovako Rotary hearth furnace Avesta Polarit Roller hearth furnace Outokumpu Catenary furnace at Avesta Outokumpu Catenary furnace at Nyby DFI Outokumpu Catenary furnace at Nyby (Flameless) Outokumpu Walking Beam furnace at Degerfors Ovako Pit Furnaces