Exhaust gas purifying method for exhaust line of e.g. oil engine, involves determining injection temperature at which ammonia is to be injected in exhaust line, and reducing nitrogen oxide emptied by ammonia injected in exhaust line

摘要

#CMT# #/CMT# The method involves storing nitrogen oxide of exhaust gas at storing temperature that is lower than or equal to 150 degree celsius, and measuring temperature of the exhaust gas. Injection temperature at which ammonia is to be injected in an exhaust line (1), is determined. The ammonia is injected within the exhaust line upstream of a nitrogen oxide storage location to empty the nitrogen oxide at the injection temperature. The nitrogen oxide emptied by the ammonia injected in the exhaust line is reduced. #CMT# : #/CMT# An independent claim is also included for a device for purifying an exhaust gas comprising nitrogen oxide. #CMT#USE : #/CMT# Method for purifying exhaust gas comprising nitrogen oxide for an exhaust line (claimed) of an internal combustion engine e.g. oil engine or petrol engine, in a vehicle. #CMT#ADVANTAGE : #/CMT# The nitrogen oxide emptied by the ammonia injected in the exhaust line is reduced, thus permitting effective and simple treatment of the nitrogen oxide of the exhaust gas without enriching the exhaust gas. The method improves effectiveness of conversion of the nitrogen oxide low temperature relative to a nitrogen oxide trap and catalysis, and simplifies introducing function of the nitrogen oxide relative to a selective catalytic reduction system at reduced cost. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a side view of an exhaust line of an internal combustion engine. 1 : Exhaust line 3 : Internal combustion engine 5 : Turbocharger 7 : Oxidation catalyst 9 : Exhaust gas purifying device.