A method of melting and / or heating a reductant fluid in an SCR exhaust aftertreatment system

摘要

A method for melting and / or heating a reducing agent liquid in an SCR exhaust aftertreatment system (1) comprising at least one reducing agent liquid reservoir (2), a heater (2a), a conduit for supplying the reducing agent liquid (4) to a metering device (5) Introducing the reducing agent into an exhaust gas line (6) of an internal combustion engine (7), a reducing agent pump (3), a return line (9) arranged upstream of the metering device (5) to the reservoir (2) and a valve (10) inserted into the return line (9) ) for circulating flowable reducing agent liquid in the SCR exhaust aftertreatment system (1) upstream of the metering device (5) while heating the reducing agent liquid with the heating device (2a), characterized in that the reducing agent liquid is circulated in the return line (9) when circulating.