System for mixing a liquid spray into a gaseous flow and exhaust aftertreatment device comprising same

A system for mixing a liquid spray into a gaseous flow, the system comprising:

• a main body having a circumferential wall defining an interior for accommodating said gaseous flow, the interior having a first longitudinal axis and extending from a first end to a second end, the first end defining an inlet opening, the second end defining an outlet opening,
• a divider baffle disposed inside said interior;
• a swirl duct disposed within said interior along a second longitudinal axis, said swirl duct having a first end adjacent to said circumferential wall and a second end extending to said divider baffle;
• an injector orifice disposed at said first end of said swirl duct and configured to receive an injector to spray reactant into the gaseous flow so that the reactant mixes with the gaseous flow in said swirl duct;
• a swirl promoting means;
• and
• a restrictor arrangement;
• said swirl promoting means being arranged between said divider baffle and said restrictor arrangement, such that gas passing through said swirl promoting means is swirled around said first longitudinal axis before passing through said restrictor arrangement towards said second end;
• and
• said restrictor arrangement being disposed within said interior between said swirl promoting means and said second end, said restrictor arrangement forcing gas reaching it from an upstream side away from a peripheral region of said interior towards a center axis of said main body.