Mixer box, a use thereof and a method for mixing

A mixer box for mixing and complete or partial vaporization and/or decomposition of a liquid additive to the exhaust gas flow from a combustion engine, which mixer box has a gas inlet (108), a gas outlet (109) and internal duct means establishing a gas flow path (A-H) from the gas inlet (108) to the gas outlet (109), which duct means includes a first duct portion (107) having an outer wall (171) and an inner wall (161), the inner wall (161) being surrounded by the outer wall (171), such that the gas flow path through said first duct portion (107) thereby is established between said walls (161, 171), said first duct portion (107) is provided with at least two partitions (121-124) extending between the outer wall (171) and the inner wall (161) and separating said first duct portion (107) into at least two duct sections (101a,101b, 102a, 102b) of which at least one is an upstream duct section (101a, 101b) and at least one is a downstream duct section (102a, 102b), wherein the duct means further includes a second duct portion (106), which second duct portion (106) is surrounded by the first duct portion (107), characterized in that a liquid injection means (112) is arranged to inject liquid into the second duct portion (106), and where the liquid injection means (112) is provided in an end wall of the second duct portion (106).