Compact evaporation and mixing device

The invention relates to a liquid evaporation and gas mixing device for an exhaust gas aftertreatment system for mixing an exhaust gas stream from the exhaust gas aftertreatment system with an evaporated liquid reducing agent, comprising a housing, the invention relates to an apparatus for swirling an exhaust gas stream, comprising a housing defining a longitudinal axis and having an upstream inlet receiving the exhaust gas stream and a downstream outlet distributing the mixed exhaust gas stream and vaporized reductant, and comprising: a) a first mixing chamber adapted to swirl the exhaust gas stream therein and having at least one inlet for receiving the exhaust gas stream and at least one outlet, b) a second mixing chamber adapted to swirl the flow of exhaust gas within the chamber and having at least one inlet for receiving the flow of exhaust gas and at least one outlet, c) a dosing module, the dosing module is used for injecting liquid reducing agent into the first chamber or the second chamber or the fi