Mixing device for reducing agent preparation

Abstract

Mixing device (1) for mixing an additive (2) with an exhaust gas flow (3), wherein the mixing device comprises at least one overflow plane which is arranged in a mixing section of an exhaust gas line. The exhaust gas duct (6) has a cross section (7) and a main flow direction (8) of the exhaust gas flow (3). The mixing device is characterized in particular in that the at least one overflow plane (4) is arranged centrally in the mixing section (5) and is oriented in the main flow direction (8) of the exhaust gas flow (3), wherein in A plurality of closed recesses (9) are formed in the overflow plane (4). The proposed mixing device achieves efficient mixing of the exhaust gas flow with additives without high flow resistance.

Description

technical field [0001] The invention relates to a mixing device for mixing exhaust gas in an exhaust gas line with an additive, wherein the additive is added, in particular to the exhaust gas, and distributed homogeneously there. In internal combustion engines, especially diesel engines and lean-burn engines, nitrogen oxides occur in undesirably large quantities. In order to remove said nitrogen oxides, it is especially suitable to add the additive ammonia, whereby when there is an excess of oxygen, the nitrogen oxides can be reduced to nitrogen and combined with the hydrogen part of the ammonia to form water. Storage of the irritating gas ammonia has proven unsuitable for mobile use. Conversely, the storage of ammonia in the form of urea dissolved in water has proven suitable for mobile use. For this, use the name A solution containing 32.5% urea has been successful in the market. However, the aqueous urea solution must be prepared accordingly by hydrolysis and / or therma...

AI Technical Summary

Problems solved by technology

This significantly increases the back pressure of the exhaust gas

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