Process for cleaning a spray nozzle for a urea solution used for the catalytic reduction of exhaust gases

摘要

Cleaning a spray nozzle for a urea solution for the catalytic reduction of NOx in diesel engine exhaust gases comprises introducing water or a cleaning liquid into the nozzle immediately after urea dosing has finished depending on the process-specific data, e.g. shortly after each start of the engine and/or after a number of doses of urea.