Device for introducing an additive into an exhaust gas

• US 20020162322A1
• Filed: 01/22/2002
• Published: 11/07/2002
• Est. Priority Date: 07/22/1999
• Status: Abandoned Application

• Current Assignee: Hartmut Ritter, Ingo Ganzmann, Jurgen Zwack, Werner Langer
• Original Assignee: Hartmut Ritter, Ingo Ganzmann, Jurgen Zwack, Werner Langer
• Inventors: Ritter, Hartmut, Langer, Werner, Zwack, Jurgen, Ganzmann, Ingo
• Application Number:
  US10/054,443
• Publication Number:
  US 20020162322A1
• Time in Patent Office: Days
• US Class Current: 60/286
• CPC Class Codes: B01D 53/79 Injecting reactants
• CPC Class Codes: B01D 53/92 of engine exhaust gases exhaust or silencing apparatus for internal combustion engines, machines or engines in general, having means for purifying, rendering innocuous or otherwise treating exhaust gases F01N3/00
• CPC Class Codes: B01F 2025/931 Flow guiding elements surrounding feed openings, e.g. jet nozzles
• CPC Class Codes: B01F 25/3131 with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
• CPC Class Codes: F01N 2240/20 a flow director or deflector
• CPC Class Codes: F01N 2470/24 Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
• CPC Class Codes: F01N 2610/02 the substance being ammonia or urea
• CPC Class Codes: F01N 2610/1453 Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A reducing agent or an additive that releases an agent is often added to an exhaust gas from engines in order to chemically convert constituents, in particular nitrogen oxides, in the exhaust gas. To achieve intimate mixing of the exhaust gas with the reducing agent or additive over a short section of the gas duct, at least one mixer and at least one nozzle for introducing the additive into the exhaust gas are structurally and functionally combined with one another.

Claims

1. A device for introducing an additive into an exhaust gas, the exhaust gas being introduced into an exhaust gas line from a diesel engine and having a flow direction, the device comprising:

at least one nozzle; and

at least one mixer for mixing the exhaust gas with the additive, said mixer and said nozzle combined with one another to form a structural and functional unit, said mixer having a tubular body disposed approximately parallel in terms of the flow direction of the exhaust gas and housing said nozzle, said tubular body having an upstream end with a first opening formed therein and a downstream end with a second opening formed therein and communicating with said first opening, said mixer having lamellae supported by said tubular body, and said lamellae, with regard to the flow direction of the exhaust gas, face upstream at said upstream end of said tubular body and face downstream at said downstream end of said tubular body.

2. The device according to claim 1, wherein said tubular body has a cross section that is circular.

3. The device according to claim 1, wherein said tubular body has a diameter in a range of 0.2 to 0.5 times a diameter of the exhaust gas line.

4. The device according to claim 1, wherein said tubular body has a length that is approximately 0.2 to 0.5 times a diameter of the exhaust gas line.

5. The device according to claim 1, wherein said mixer has a tubular connection piece projecting into the exhaust gas line and guided onto said tubular body, said mixer further having a tube serving as a feed line and as a support for said nozzle, said tube extending into said tubular body through said tubular connecting piece.

6. The device according to claim 1, wherein mixer has a center axis and said nozzle lies on said center axis in such a manner that the additive can be sprayed in the flow direction of the exhaust gas.

7. The device according to claim 1, wherein said tubular body has an axis, and said lamellae supported by said upstream end and said downstream end of said tubular body form an angle of 30°

to 60°

, with said axis of said tubular body and, said lamellae for support, have free ends directed onto an inner side of the exhaust gas line.

8. The device according to claim 1, wherein said lamellae have root ends connected to said tubular body and free ends being approximately twice as wide as said root ends.

9. The device according to claim 1, wherein said lamellae have a given width, and between adjacent ones of said lamellae free spaces are formed having a width approximately as wide as said given width of said lamellae.

10. The device according to claim 1, wherein said lamellae that face upstream are disposed staggered with respect to said lamellae that face downstream.

11. The device according to claim 1, wherein a number of said lamellae facing upstream is equal to a number of said lamellae facing downstream.

12. The device according to claim 1, wherein said tubular body bears a same number of said lamellae at both of said upstream end and said downstream end.

13. The device according to claim 1, wherein said lamellae include planar metal sheets.

14. The device according to claim 12, wherein said tubular body bears between four and eight of said lamellae at both of said upstream end and said downstream end.

15. The device according to claim 7, wherein said angle is 45°

.