Device for exhaust-gas treatment near an engine and motor vehicle having the device

• US 9,188,039 B2
• Filed: 01/28/2013
• Issued: 11/17/2015
• Est. Priority Date: 07/28/2010
• Status: Active Grant

• Current Assignee: Emitec Gesellschaft für Emissionstechnologie mbH (Continental AG)
• Original Assignee: Emitec Gesellschaft für Emissionstechnologie mbH (Continental AG), J. Eberspaecher Gmbh & Co. KG
• Inventors: Nagel, Thomas, Kruse, Carsten, Oesterle, Joerg, Leicht, Sebastian, Mueller, Joerg-Uwe, Haenisch, Jan
• Primary Examiner(s): Denion, Thomas
• Assistant Examiner(s): Stanek, Kelsey
• Application Number:
  US13/751,576
• Publication Number:
  US 20130139505A1
• Time in Patent Office: 1,023 Days
• Field of Search: 606/051, 602/72, 60275-324, 602/74, 422/170, 422/172, 422/182
• US Class Current: 1/1
• CPC Class Codes: F01N 2240/20 a flow director or deflector
• CPC Class Codes: F01N 2240/40 a hydrolysis catalyst
• CPC Class Codes: F01N 2250/02 filtering and catalytic conversion
• CPC Class Codes: F01N 2470/08 Gas passages being formed between the walls of an outer shell and an inner chamber
• 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 3/02 for cooling, or for removing solid constituents of, exhaust by means of electric or electrostatic separators F01N3/01 ; mixing air with exhaust in tailpipes F01N13/082, F01N13/20
• CPC Class Codes: F01N 3/0231 using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
• CPC Class Codes: F01N 3/04 using liquids
• CPC Class Codes: F01N 3/10 by thermal or catalytic conversion of noxious components of exhaust by using other chemical processes, chemical aspects of catalytic conversion, e.g. using specified catalysts, B01D53/34
• CPC Class Codes: F01N 3/103 Oxidation catalysts for HC and CO only
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: F01N 3/2892 Exhaust flow directors or the like, e.g. upstream of catalytic device
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A device for exhaust-gas treatment near an engine includes an annular structure and a guide structure disposed in an exhaust line. An inner wall forms an inner flow passage and an outer flow passage in the annular structure. The inner wall and the guide structure form a gap in such a way that only a limited secondary flow of the exhaust gas is conducted through the inner flow passage. A motor vehicle having the device is also provided.

Claims

1. A device for exhaust-gas treatment near an engine, the device comprising:

an exhaust line conducting exhaust gas from the engine in a flow direction;

a single inflow portion receiving an entire exhaust gas flow from the engine through said exhaust line, an annular structure and a sleeve-shaped guide structure disposed in said exhaust line;

an inner wall forming an inner flow passage with an inlet region and an outer flow passage in said annular structure;

said inflow portion causing the exhaust gas to impinge obliquely on said annular structure;

said guide structure being separate from and extending into said inner flow passage formed by said inner wall;

said inner wall and said guide structure defining a gap therebetween forming a throttle in said inlet region of said inner flow passage configured to limit a secondary flow of the exhaust gas conducted through said inner flow passage;

an additive discharger configured to meter a urea-water solution additive into said inner flow passage and to admix the metered additive only to said secondary flow of the exhaust gas;

a mixing region following said gap in said flow direction and configured to mix the additive with said secondary flow; and

a hydrolysis catalytic converter disposed in said inner flow passage and following said mixing region in said flow direction.

2. The device according to claim 1, wherein said gap is an annular gap formed concentrically to said inner wall.

3. The device according to claim 1, wherein said inner wall and said sleeve partially overlap radially.

4. The device according to claim 1, wherein said outer flow passage has another catalytic converter.

5. The device according to claim 1, which further comprises:

an exhaust gas mixing portion disposed downstream of said annular structure in the exhaust gas flow direction;

said inner wall of said annular structure projecting into said mixing portion; and

said inner wall having a mixer structure.

6. The device according to claim 1, which further comprises a catalytically active additive reactor disposed downstream of said annular structure in the exhaust gas flow direction, said additive reactor configured to allow metered additive to react with the exhaust gas in said additive reactor.

7. The device according to claim 6, wherein said additive reactor is also a particle separator.

8. A motor vehicle, comprising:

an engine producing exhaust gas;

a turbocharger through which the exhaust gas flows downstream of said engine; and

a device according to claim 1 through which the exhaust gas flows downstream of said turbocharger.

9. The motor vehicle according to claim 8, wherein said device is disposed directly downstream of said turbocharger.

10. The device according to claim 1, wherein said throttle in said inlet region of said inner flow passage is a labyrinth.

11. The device according to claim 1, wherein said guide structure is connected to said exhaust line and is not connected to said annular structure.

12. The device according to claim 1, which further comprises flanges connecting the device to adjacent parts of the engine to permit a close-coupled or near-engine configuration under restricted spatial conditions in an engine compartment of a motor vehicle.

13. The device according to claim 1, wherein said additive discharger extends through said exhaust line and is surrounded by said guide structure.

14. The device according to claim 1, wherein said guide structure is joined to said additive discharger.

15. The device according to claim 1, wherein said inner wall has an inner side, and said gap dimensions said secondary flow to form a boundary flow at said inner side of said inner wall reducing predominant wetting of said inner wall with the additive.