The site of Kessales near Liège hosts a continuous annealing line that produces mild and Ultra Hight Strength steels for automotive and industry clients throughout Europe. In 2011, the decision was taken to renew the technology of the burners of the line for quality, energy and environmental reasons.
One of the key-objectives was to reduce NOX (Nitrogen Oxides) emissions by reducing the temperature of the flames and the excess of Oxygen in the combustion.
In November 2011, the line was interrupted during 6 weeks in order to execute this 7 million Euros investment, which took place at various levels:
One year and a half after these investments, the outcomes go beyond the initial expectations. Altogether, the new burners and radiant tubes, by allowing part of the fumes to circulate again in the tubes, diminish the oxygen brought into the combustion as well as the flame temperature and therefore NOX emissions. The new set-up allows also a better heating of the coil.
On top of that, the new state-of-the-art installation allows to reprocess 3 tons per hour of steam in average, both for the manufacturing process itself and also to heat the buildings. This represents 15% of the total consumption of steam of the Kessales site, an annual saving of 23500 Gigajoules of natural gas and 1311 tons of CO2.