Dosing and mixing arrangement for use in exhaust aftertreatment

Patent metadata

Field	Value
Publication number	US-11110406-B2
Application number	US-202016825586-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Feb 15, 2013
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A method for causing exhaust gas flow to flow at least 270 degrees in a first direction about a perforated tube using a baffle plate having a main body with a plurality of flow-through openings and a plurality of louvers positioned adjacent to the flow-through openings. The method includes deflecting a first portion of the exhaust gas flow with the main body of the baffle plate. The method also includes allowing a second portion of the exhaust gas flow to flow through the flow-through openings of the baffle plate. The method also deflects the second portion of the exhaust gas flow at a downstream side of the main body with the louvers hereby causing the second portion of the exhaust gas flow to flow in the first direction about the perforated tube.

First claim

What is claimed is:

1. A dosing and mixing arrangement comprising:
a main body extending along a length between first and second opposite ends of the main body, the main body defining a longitudinal axis extending between the first and second ends, the main body also defining an interior accessible through an inlet;
an outlet pipe extending through the main body at a location adjacent the second end of the main body, the outlet pipe extending in a direction transverse to the longitudinal axis of the main body;
a mixing region disposed within the interior of the main body, the mixing region including a perforated conduit that extends transverse to the longitudinal axis of the main body, the perforated conduit defining multiple openings disposed along a circumference of the perforated conduit, the mixing region also including a flow path extending around the perforated conduit and leading into the perforated conduit through the multiple openings; and
a baffle arrangement disposed within the interior of the main body, the baffle arrangement defining a first entrance to the flow path, the baffle arrangement also defining a second entrance to the flow path, the second entrance being spaced along the flow path from the first entrance.

2. The dosing and mixing arrangement of claim 1 , wherein the baffle arrangement includes a curved baffle plate having at least a portion extending between the perforated conduit and the inlet.

3. The dosing and mixing arrangement of claim 2 , wherein the first entrance is defined by a first aperture extending through the curved baffle plate and the second entrance is defined by a second aperture extending through the curved baffle plate.

4. The dosing and mixing arrangement of claim 1 , wherein the outlet pipe is coupled to the perforated conduit.

5. The dosing and mixing arrangement of claim 4 , wherein the outlet pipe is a first section of a tube and the perforated conduit is a second section of the tube.

6. The dosing and mixing arrangement of claim 4 , wherein the outlet pipe has a constant diameter along a length of the outlet pipe, the length of the outlet pipe extending transverse to the longitudinal axis of the main body.

7. The dosing and mixing arrangement of claim 1 , wherein the perforated conduit has a constant diameter along a length of the perforated conduit, the length of the perforated conduit extending transverse to the longitudinal axis of the main body.

8. The dosing and mixing arrangement of claim 1 , wherein the baffle arrangement includes a first curved surface positioned at the first entrance and a second curved surface positioned at the second entrance.

9. The dosing and mixing arrangement of claim 8 , wherein both the first and second curved surfaces direct exhaust flow in a common direction along the flow path.

10. The dosing and mixing arrangement of claim 1 , wherein the baffle arrangement includes a curved baffle plate extending partially along the perforated conduit, and wherein an open flow area is defined between the curved baffle plate and an opposing surface of the main body.

11. The dosing and mixing arrangement of claim 10 , wherein the first entrance leads to a portion of the flow path extending between the curved baffle plate and the perforated conduit, and wherein the open flow region defines the second entrance.

12. The dosing and mixing arrangement of claim 1 , further comprising a substrate disposed within the interior of the main body and along a flow path between the inlet and the perforated conduit.

13. The dosing and mixing arrangement of claim 1 , further comprising a reactant dispenser location disposed at an end of the perforated conduit.

14. The dosing and mixing arrangement of claim 13 , wherein the reactant dispensing location is aligned with a central longitudinal axis of the perforated conduit, the central longitudinal axis extending through the outlet pipe.

15. The dosing and mixing arrangement of claim 13 , further comprising a reactant dispenser mounted at the reactant dispenser location.

16. The dosing and mixing arrangement of claim 1 , wherein the inlet is disposed at the first end of the main body, wherein the longitudinal axis of the main body extends through the inlet.

17. The dosing and mixing arrangement of claim 1 , wherein the multiple openings are disposed along a length of the perforated conduit.

18. A dosing and mixing arrangement comprising:
a main body extending along a length between first and second opposite ends of the main body, the main body defining a longitudinal axis extending between the first and second ends, the main body also defining an interior accessible through an inlet;
an outlet pipe extending through the main body at a location adjacent the second end of the main body, the outlet pipe extending in a direction transverse to the longitudinal axis of the main body;
a mixing region disposed within the interior of the main body, the mixing region including a perforated conduit that extends transverse to the longitudinal axis of the main body, the mixing region also including a flow path extending around the perforated conduit and leading into the perforated conduit; and
a baffle arrangement disposed within the interior of the main body, the baffle arrangement defining a first entrance to the flow path, the baffle arrangement also defining a second entrance to the flow path, the second entrance being spaced along the flow path from the first entrance, the baffle arrangement including a curved baffle plate spaced from the perforated conduit so that the flow path passes through an open flow area disposed between at least a portion of the baffle arrangement and an opposing surface of the perforated conduit.

19. The dosing and mixing arrangement of claim 18 , wherein the first entrance leads to a portion of the flow path extending between the curved baffle plate and the opposing surface of the perforated conduit, and wherein the open flow area defines the second entrance.

20. A dosing and mixing arrangement comprising:
a main body extending along a length between first and second opposite ends of the main body, the main body defining a longitudinal axis extending between the first and second ends, the main body also defining an interior accessible through an inlet;
an outlet pipe extending through the main body at a location adjacent the second end of the main body, the outlet pipe extending in a direction transverse to the longitudinal axis of the main body;
a mixing region disposed within the interior of the main body, the mixing region including a perforated conduit that extends transverse to the longitudinal axis of the main body, the perforated conduit defining multiple openings, the mixing region also including a flow path extending around the perforated conduit and leading into the perforated conduit through the multiple openings; and
a baffle arrangement disposed within the interior of the main body, the baffle arrangement defining a first entrance to the flow path, the baffle arrangement also defining a second entrance to the flow path, the second entrance being spaced along the flow path from the first entrance, wherein the baffle arrangement includes a curved baffle plate having at least a portion extending between the perforated conduit and the inlet.

21. A dosing and mixing arrangement comprising:
a main body extending along a length between first and second opposite ends of the main body, the main body defining a longitudinal axis extending between the first and second ends, the

Assignees

• Donaldson Co Inc

Inventors

• De Rudder Korneel
• Le Merdy Stéphane

Classifications

• B01F2025/931

  Flow guiding elements surrounding feed openings, e.g. jet nozzles · CPC title

• B01F23/2132 Primary

  using nozzles · CPC title

• B01F25/3131

  with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements · CPC title

• B01F25/103

  with additional mixing means other than vortex mixers, e.g. the vortex chamber being positioned in another mixing chamber · CPC title

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title