AN EXHAUST AFTERTREATMENT SYSTEM

An exhaust aftertreatment system (100) for an internal combustion engine (110), comprising:- an outer casing (101) having an exhaust gas inlet (102) and an exhaust gas outlet (103) between which a fluid flow path (104) for exhaust gases is provided,- a selective catalytic reduction unit (105) provided in the fluid flow path for reducing nitrogen oxides,- a reductant dosing device (108) for adding reductant to the exhaust flow upstream of the selective catalytic reduction unit, and- a rotatable mixer device (109) for mixing the reductant with exhaust gases upstream of the selective catalytic reduction unit,- an air inlet valve (111) provided upstream of the mixer device for introducing air into the fluid flow path, and- an electric motor (112) arranged for rotating the mixer device to create a suction of air into the fluid flow path via the air inlet valve,The exhaust aftertreatment system further comprises a heating element (130) configured to heat gaseous medium flowing in the fluid flow path.