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REBOX® - Oxyfuel Solutions in Reheating |
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For existing furnaces with unchanged staffing, REBOX® offers efficient solutions providing increased production capacity and flexibility, decreased fuel costs and lowered emissions of CO2, NOx and SOx. REBOX® has also been successfully applied in new furnaces.
More capacity with less emission:
- Throughput (ton/hour) increased up to 50%
- Fuel savings up to 50%
- Corresponding 50% reduction of CO2
- NOx emissions below 0.16 lb/mmBtu
Experience and technical lead
Linde has supplied 85 REBOX® oxyfuel-based solutions to batch and continuous reheat furnaces for rolling mills and forge shops as well as for annealing furnaces since 1990. Linde not only has the experience from these installations, but is also a forerunner in combustion technology development. 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 and 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 and also 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 organization 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 all oxyfuel operations in reheat furnaces and annealing lines.
Linde develops and produces the powerful, compact and rugged oxyfuel burners needed to retrofit in existing furnaces. The efficient oxyfuel technology makes it possible to replace a 6.8 mmBtu/hr airfuel burner with a more compact REBOX® burner of 4.4 mmBtu/hr and still allow for increased production capacity. The control system handles all aspects of operation including safety, optimum heating and energy usage.
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1. Oxy-Fuel Combustion for Reheat Furnaces, Steel Times International (PDF, 958.Kb)
2. Oxy-Fuel - Demanding, but (PDF, 143.1Kb)
3. Boosting Heating Capacity using New Technology (PDF, 464.Kb)
4. Short Term Opportunities for Decreasing CO2, SCANMET 2004 (PDF, 270.3Kb)
5. Oxyfuel Solutions for Higher Throughput with Less Emissions, Riva del Garda Sept 2004 (PDF, 756.5Kb)
6. Comparison of Flameless Oxyfuel and Regenerative Technology (PDF, 293.5Kb)
7. Fuel Savings & Reduced Emissions - AIS Tech 2004 (PDF, 380.3Kb) |
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