Device and method for operating nitrogen oxide catalyst

• Main Author: HEIMANN CHRISTIAN
• Format: Patent
• Language: Chinese; English
• Published: 07.07.2023
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

The invention relates to a device (100) and a method (102) for operating a catalyst for the selective catalytic reduction of nitrogen oxides in an exhaust gas (102). The size of the urea aqueous solution film on at least a portion of an inner wall (114) of a line (116) through which exhaust gas and urea aqueous solution can be fed to the catalyst (102) is determined by means of a model (110) for predicting the urea aqueous solution film on at least a portion of the inner wall (114), the size of the urea aqueous solution film on at least a portion of the inner wall (114) being determined when the size is below a threshold value. Wherein, when the size reaches or exceeds the threshold value, the mass flow of the aqueous urea solution introduced into the catalyst (102) is limited to a first value, and wherein, when the size reaches or exceeds the threshold value, the mass flow of the aqueous urea solution is limited to a second value, which is smaller than the first value. 用于运行用于选择性地催化还原在废气(102)中的氮氧化物的催化器的设备(100