Linde Aktiengesellschaft

Aga Ab

Johannes Lodin

Ola Ritzén

Lennart Rangmark

Sören Wiberg

Henrik Gripenberg

Lars-Göran Elfgren

A cold rolled strip () of aluminum is continuously transported along a transport path where a ramp of Direct Flame Impingement (DFI) burners () are located, for heating the strip. The ramp () is located perpendicular, or substantially perpendicular, to the direction of movement of the strip (), the DFI burners () are mutually located such that the whole width of the strip () is heated to the same, or substantially the same, temperature. The velocity of the strip () passing the ramp and the heating power of the burners () are adapted to heat treat the strip () such that annealing of the strip is carried out and the heat treated strip is wound to a coil ().

Annealing of cold rolled metal strip

A method for providing uniform heat distribution within a furnace as well as decreasing the amount of NOin the combustion products, when operating an industrial furnace having at least one conventional burner using air as the oxidant. At least one lance is connected with the furnace, and an oxidant including oxygen gas is flowed into the furnace through the lance to impinge against a flame issuing from the burner at a certain impingement point. The amount of oxygen supplied by the air supply to the burner together with the amount of oxidant issuing from the lance corresponds with the stoichiometric amount for a fuel supplied to the burner. At least 50% of the supplied oxygen for combustion is supplied through the lancing of oxidant, and the oxidant is flowed into the furnace through the lance at a velocity of at least 200 m/s.

Lancing of oxygen

Growing community of inventors

Älvsjö, Sweden

Johannes Lodin