Robert Boschgmbh

Franz-Josef Trompeter

Markus Buerglin

Stefan Woerz

Markus Hernier

Norbert Breuer

Matthias Burger

Peter Riegger

Andreas Genssle

Thorsten Raatz

Thomas Hauber

Ralf Wegst

Dirk Von Meduna

Matthias Kruse

The invention proposes a method for metering a reagent, in which the reagent is sprayed into a spray tube () via an electrically activated metering valve (), and is mixed in the spray tube () with compressed air, and in which the reagent mixed with compressed air is introduced by means of the spray tube () into an exhaust gas duct () and is atomized, and a device for carrying out the method. The procedure according to the invention is distinguished in that the duration of the metering valve activation signal () is corrected depending on the differential pressure between the hydraulic pressure (p_Rea_hyd) of the reagent in the metering valve () and the pneumatic pressure (p_D_pneu) in the spray tube (). The procedure according to the invention permits a high degree of accuracy in the metering of the reagent.

Method for metering a reagent into an exhaust gas duct and device for carrying out the method

Devices and methods for the production of ammonia as a reducing agent for the selective catalytic reduction (SCR) of nitrogen oxides in the exhaust gas of a combustion source, especially of an internal combustion engine. The ammonia is admixed with the exhaust gas in the direction of flow in front of a SCR-catalytic converter. In so doing, nitrogen oxide is produced in a nitrogen oxide production unit separated from the combustion source and its exhaust gas duct and is stored in at least one storage catalytic converter or a nitrogen oxide storage and a subsequently connected catalytic converter. Furthermore, hydrogen and/or a hydrogen-carbon monoxide-mixture is produced in a hydrogen production unit separated from the combustion source and its exhaust gas duct and delivered to a storage catalytic converter. Hydrogen and the stored nitrogen oxide are converted catalytically to ammonia in the storage catalytic converter or in the catalytic converter.

Device and procedure for the production of ammonia

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Freiberg am Neckar, Germany

Franz-Josef Trompeter