SUCCESSFUL USE OF FLAMELESS OXYFUEL IN STEEL REHEATING

1 VON SCHEELE Joachim
Co-authors:
2 ZILKA Vladimir
Institutions:
1 Linde Technology, Linde plc, Munich, Germany, EU, joachim.von.scheele@linde.com
2 Linde Gas a.s., Brno, Czech Republic, EU, vladimir.zilka@linde.com
Conference:
29th International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 20 - 22, 2020
Proceedings:
Proceedings 29th International Conference on Metallurgy and Materials
Pages:
37-45
ISBN:
978-80-87294-97-0
ISSN:
2694-9296
Published:
27th July 2020
Proceedings of the conference have been sent to Web of Science and Scopus for evaluation and potential indexing.
Metrics:
23 views / 5 downloads
Abstract

Using oxyfuel combustion in steel reheating provides higher throughput and substantial fuel savings. Accordingly, oxyfuel has many benefits, but also some drawbacks like hot spots in furnaces and thermal NOx generation. However, by making the combustion “Flameless” by creating a ‘volume combustion’, these issues can be overcome, and additional advantages can be achieved. This paper describes different solutions, both fully flameless and semi flameless, which have been developed and implemented in steel reheating and annealing furnaces.Over the past three decades, Linde has made more than 160 oxyfuel installations in all types of reheating furnaces, both batch and continuous, and for production of all different steel grades. Since 2003, focus has been on using Flameless Oxyfuel, hitherto resulting in 112 successful installations, 90 of these operating fully with 100 % Flameless Oxyfuel. This paper describes results from these installations, which include fuel savings of up to 60 %, increased throughput by up to 50 %, substantial reductions of CO2 and NOx emissions, much improved temperature uniformity of the heated steel, reduction of scale losses by up to 50 %.Cases with conversion from air-fuel to Flameless Oxyfuel will are described. These examples comprise installations in soaking pit furnaces, rotary hearth furnaces, roller hearth furnaces, and walking beam furnaces with up to 300 t/h nominal capacity, and for production of carbon steel, engineering steel, and stainless steel grades at companies in USA, Europe, and Asia.

Keywords: Steel, reheating, oxyfuel, energy, emission
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