Linde recently installed its Rebox^® oxyfuel solutions in ThyssenKrupp Steel’s galvanizing line at the Finnentrop, Germany, facility. The new technology resulted in a 30% production increase, from 82 to 105 tons per hour.

The Rebox technology incorporates direct flame impingement (DFI) oxyfuel, where the oxyfuel flames are fired directly onto the moving metal. The DFI oxyfuel increases heat transfer for more throughput without extending the furnace or line. Three meters of the recuperative zone were refitted with a compact 5-mW DFI oxyfuel unit consisting of four burner row sets.

Fuel consumption was reduced by 6% and annealing properties over the entire strip width were improved. In addition to effectively heating the steel, which facilitates reduced fuel consumption, oxyfuel also cleans the steel, which eliminated ThyssenKrupp’s need for its 25-meter pre-cleaning section.

Linde has made over 100 oxyfuel installations internationally in reheating and annealing furnaces, resulting in increased furnace capacity, more flexibility and reduced costs for the steel industry.

ThyssenKrupp Steel AG produces galvanized strip for use in the automotive, white goods and for the construction industry at its Finnentrop, Germany, facility.