REDUCTANT-METERING SYSTEM HAVING A MODULAR STRUCTURE

The invention relates to a reductant-metering system (10) for injecting a reductant into the exhaust-gas flow of an internal combustion engine for selective catalytic reduction, comprising a conveying pump, by means of which reductant from a reductant tank (40) is suctioned from the tank (40) via a suction connection piece (23) and conveyed via a pressure connection piece (50) and introduced into the exhaust-gas flow of the internal combustion engine via at least one nozzle (60), wherein the metering system (10) has a compressed-air supply and the reductant is atomized by means of compressed air outside of the nozzle (60), wherein the reductant-metering system (10) has a modular structure consisting of at least two integrated assemblies (20, 30), wherein the first integrated assembly is designed as a metering unit (20) and has at least the pump, the suction connection piece, the pressure connection piece, and a compressed-air connection and wherein the second integrated assembly is designed as a compressed-air unit (30) and has at least one controlled valve for controlling the compressed-air supply.