An exhaust aftertreatment system

An exhaust aftertreatment system for an internal combustion engine, the exhaust aftertreatment system comprising:

• an outer casing having an exhaust gas inlet and an exhaust gas outlet between which a fluid flow path for exhaust gases from the internal combustion engine is provided,
• a selective catalytic reduction unit provided in the fluid flow path for reducing nitrogen oxides,
• a reductant dosing device for adding reductant to the exhaust flow upstream of the selective catalytic reduction unit, and
• a rotatable mixer device for mixing the reductant with exhaust gases upstream of the selective catalytic reduction unit,
• an air inlet valve provided upstream of the mixer device for introducing air into the fluid flow path, and
• an electric motor arranged for rotating the mixer device to create a suction of air into the fluid flow path via the air inlet valve,
• wherein the exhaust aftertreatment system further comprises a heating element configured to heat gaseous medium flowing in the fluid flow path.