Apparatus for the aftertreatment of the exhaust gases of diesel engines

Patent metadata

Field	Value
Publication number	US-9587543-B2
Application number	US-201414547982-A
Country	US
Kind code	B2
Filing date	Nov 19, 2014
Priority date	Jul 25, 2007
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

An exhaust gas aftertreatment device, including a bent exhaust pipe, a mixing pipe having a closed end at the exhaust pipe bend and a bell-shaped widened portion in at least partial contact with the exhaust pipe at its opposite end, and a nozzle connected to a receptacle in the mixing pipe closed end for injecting an additive into the exhaust gases, with a mixing one in the exhaust pipe between the urea nozzle and the exhaust pipe outlet in which the exhaust gases flow around the mixing pipe symmetrically and form a double eddy in the mixing pipe.

First claim

The invention claimed is:

1. A device for aftertreating exhaust gases, comprising:
an exhaust pipe ( 2 ) having an inlet end and an outlet end positioned in a downstream direction relative to the inlet end, the exhaust pipe including a continuously curved bend;
a mixing pipe ( 20 ) including a first section having a substantially constant cross-sectional area extending between a first end adjacent the continuously curved bend and a second end downstream of the first end, and further including a second section having a conical or bell-shaped widened portion ( 23 ) extending outwardly from the second end and in contact with the exhaust pipe;
a urea nozzle adjacent the first end of the first section of the mixing pipe for injecting an additive into the first section of the mixing pipe; and
a mixing zone positioned downstream relative to the first end of the first section of the mixing pipe;
wherein the first section of the mixing pipe includes at least one perforation ( 22 ) permitting the flow of a first volume of exhaust gases therethrough to promote a homogenous mixture of the first volume of exhaust gases and the additive at the center of the exhaust pipe in the mixing zone;
wherein the second section of the mixing pipe permits the flow of a second volume of exhaust gases therethrough and allowing the second volume of exhaust gases to form a jacket flow around the homogenous mixture in the mixing zone.

2. The device according to claim 1 , wherein the mixing pipe widened portion includes perforations ( 24 ) permitting the flow of the second volume of exhaust gases therethrough.

3. The device according to claim 1 , wherein said mixing pipe first section includes a plurality of irregularly distributed perforations ( 22 ).

4. The device according to claim 1 , wherein the exhaust pipe and mixing pipe are configured and relatively situated so that exhaust gases ( 1 ) flow around the mixing pipe ( 20 ) symmetrically and form a double eddy ( 1 ′) in the mixing pipe ( 20 ).

5. The device according to claim 1 , further comprising an opening through said exhaust pipe ( 2 ) at the exhaust pipe bend, wherein said mixing pipe first end extends through said exhaust pipe opening.

6. The device according to claim 1 , wherein the additive includes a composition to chemically react with diesel engine exhaust gases across an SCR.

7. The device according to claim 1 , wherein the second section of the mixing pipe includes at least one perforation ( 24 ) permitting said second volume of exhaust gases therethrough and allowing the second volume of exhaust gases to form a jacket flow around the homogenous mixture in the mixing zone.

Assignees

• Tenneco Gmbh

Inventors

• Haverkamp Sascha
• Lang Andreas
• Wolf Michael

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• Y02T10/24

  Cross-Sectional Technologies · mapped topic

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N2610/14

  Arrangements for the supply of substances, e.g. conduits · CPC title

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title