Reductant delivery system, exhaust treatment system and vehicle comprising the exhaust treatment system

An exhaust treatment system arranged for treatment of an exhaust stream resulting from a combustion in a combustion engine, the exhaust treatment system comprising:

• a particulate filter arranged to catch soot and ash created by the combustion;
• a reductant delivery system arranged downstream of the particulate filter, the reductant delivery system configured to supply a reductant into the exhaust stream, wherein the reductant delivery system comprises:
• an evaporator configured to mix the reductant with the exhaust stream flowing through the evaporator;
• a reductant doser configured essentially in a center of a cross section of the evaporator to provide the reductant in fluid form to a tube arrangement, the cross section being perpendicular to a flow direction of the exhaust stream;
• and
• the tube arrangement configured between the reductant doser and at least one evaporating surface of the evaporator to receive the reductant in fluid form from the reductant doser and to deliver the reductant in fluid form at the at least one evaporating surface, such that the reductant is distributed as a liquid wall film on the at least one evaporating surface;
• and
• a selective catalytic reduction catalyst arranged downstream of the reductant delivery system for reduction of nitrogen oxides NOx in the exhaust stream by utilization of the supplied reductant.

An exhaust treatment system arranged for treatment of an exhaust stream resulting from a combustion in a combustion engine, the exhaust treatment system comprising:

• an upstream dosing device arranged to supply a reductant into the exhaust stream;
• an upstream selective catalytic reduction catalyst arranged downstream of the upstream dosing device for reduction of nitrogen oxides NOx in the exhaust stream by utilizing the supplied reductant;
• a particulate filter arranged downstream of the upstream selective catalytic reduction catalyst to catch soot and ash created by the combustion;
• a reductant delivery system arranged downstream of the particulate filter, the reductant delivery system configured to supply a reductant into the exhaust stream, wherein the reductant delivery system comprises:
• an evaporator configured to mix the reductant with the exhaust stream flowing through the evaporator;
• a reductant doser configured essentially in a center of a cross section of the evaporator to provide the reductant in fluid form to a tube arrangement, the cross section being perpendicular to a flow direction of the exhaust stream;
• and
• the tube arrangement configured between the reductant doser and at least one evaporating surface of the evaporator to receive the reductant in fluid form from the reductant doser and to deliver the reductant in fluid form at the at least one evaporating surface, such that the reductant is distributed as a liquid wall film on the at least one evaporating surface;
• and
• a downstream selective catalytic reduction catalyst arranged downstream of the reductant delivery system to reduce nitrogen oxides NOx in the exhaust stream by utilizing the supplied reductant.

A vehicle comprising an exhaust treatment system arranged for treatment of an exhaust stream resulting from a combustion in a combustion engine of the vehicle, the exhaust treatment system comprising:

• a particulate filter arranged to catch soot and ash created by the combustion;
• a reductant delivery system arranged downstream of the particulate filter, the reductant delivery system configured to supply a reductant into the exhaust stream, wherein the reductant delivery system comprises:
• an evaporator configured to mix the reductant with the exhaust stream flowing through the evaporator;
• a reductant doser configured essentially in a center of a cross section of the evaporator to provide the reductant in fluid form to a tube arrangement, the cross section being perpendicular to a flow direction of the exhaust stream;
• and
• the tube arrangement configured between the reductant doser and at least one evaporating surface of the evaporator to receive the reductant in fluid form from the reductant doser and to deliver the reductant in fluid form at the at least one evaporating surface, such that the reductant is distributed as a liquid wall film on the at least one evaporating surface;
• and
• a selective catalytic reduction catalyst arranged downstream of the reductant delivery system for reduction of nitrogen oxides NOx in the exhaust stream by utilization of the supplied reductant.