METHOD AND UNIT FOR APPLYING A PROTECTIVE OR DECORATIVE COATING TO A METAL BAND

摘要

Installation for the protective or decorative coating of a metal strip (1), where the said metallic strip (1) is moving continuously through the installation and consists on, at least, a tunnel furnace (2), a regenerative incinerator (6) and an extraction circuit (19) of the gas of the tunnel furnace with a flow Q2 at a temperature T2; as well as a second dilution circuit (12) of the air entering the said tunnel furnace (2) and comprises an additional circuit of injection (14) of hot air at a temperature T1 with a flow Q1 connected to the said circuit of extraction of gas (19) from the tunnel furnace (2) at the regenerative incinerator (6) inlet, such that the inlet flow Q3 is the addition of the injection flow Q1 and extraction flow Q2, and its temperature T3 is higher than the dew point of the volatile organic compounds.