Exhaust gas mixer

Patent metadata

Field	Value
Publication number	US-9945278-B2
Application number	US-201414533220-A
Country	US
Kind code	B2
Filing date	Nov 5, 2014
Priority date	Nov 5, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A power system including a selective reduction catalyst and an exhaust gas mixer positioned downstream thereof. The exhaust gas mixer includes an inlet opening a plurality of peripheral inlet openings and a plurality of swirler guides. The inlet opening is positioned to receive a first portion of exhaust gas exiting the SCR catalyst, while the plurality of peripheral inlet openings are positioned to receive a second portion of exhaust gas exiting the SCR catalyst. The swirler guides extend radially inwards from a respective peripheral inlet opening, so as to swirl the second portion of exhaust gas about and into the first portion of exhaust gas.

First claim

The invention claimed is:

1. An exhaust gas mixer, comprising:
an inlet plate comprising a plate inlet opening, the inlet plate comprising a plurality of tab receiving apertures positioned radially outward from the plate inlet opening, the plate inlet opening being positioned to receive a first portion of an exhaust gas exiting a selective catalytic reduction (SCR) catalyst;
a tubular surface extending downstream, relative to a direction of flow of the first portion of the exhaust gas, from the plate inlet opening, the tubular surface comprising a plurality of peripheral inlet openings positioned to receive a second portion of the exhaust gas exiting the SCR catalyst, the inlet plate being coupled to the tubular surface upstream of the peripheral inlet openings, relative to the direction of flow of the first portion of the exhaust gas, the inlet plate being angled relative to the tubular surface; and
a plurality of swirler guides, each of the swirler guides extending radially inwards from a respective peripheral inlet opening, each of the swirler guides comprising a tab extending upstream, each of the tabs being positioned in a respective one of the tab receiving apertures for positioning the inlet plate relative to the tubular surface, the swirler guides configured to swirl the second portion of the exhaust gas about and into the first portion of the exhaust gas.

2. The exhaust gas mixer of claim 1 , wherein each swirler guide is bent radially inward from the tubular surface at a bend, each swirler guide extends circumferentially away from each respective bend, and each bend is parallel to a longitudinal axis of the tubular surface.

3. The exhaust gas mixer of claim 2 , wherein the inlet plate is positioned inside of the tubular surface.

4. The exhaust gas mixer of claim 2 , wherein each of the swirler guides is positioned completely radially outward from the plate inlet opening.

5. The exhaust gas mixer of claim 2 , wherein there is not SCR catalyst downstream of the tubular surface, and there is not an ammonia oxidation catalyst downstream of the tubular surface.

6. The exhaust gas mixer of claim 1 , wherein the tubular surface is positioned in an outlet cone that tapers radially inwards thereto in a downstream direction and contacts a region downstream of the peripheral inlet openings, and a longitudinal axis of the tubular surface intersects the plate inlet opening.

7. The exhaust gas mixer of claim 6 , wherein the outlet cone surrounds the peripheral inlet openings and swirler guides, and the outlet cone is configured to route the second portion of the exhaust gas through the peripheral inlet openings and against the swirler guides.

8. The exhaust gas mixer of claim 1 , wherein each tab is coupled to each respective receiving aperture with a weld positioned upstream of the inlet plate.

9. A power system, comprising:
a selective catalytic reduction (SCR) catalyst;
an exhaust gas mixer positioned downstream, relative to a direction of flow of a first portion of an exhaust gas, of the SCR catalyst, the exhaust gas mixer comprising:
an inlet plate comprising a plate inlet opening positioned to receive the first portion of the exhaust gas exiting the SCR catalyst, the inlet plate comprising a plurality of tab receiving apertures positioned radially outward from the plate inlet opening;
an outer surface comprising a plurality of peripheral inlet openings positioned to receive a second portion of the exhaust gas exiting the SCR catalyst, the inlet plate being coupled to the outer surface upstream of the peripheral inlet openings, relative to the direction of flow of the first portion of the exhaust gas, the inlet plate being angled relative to the outer surface, the outer surface being a tubular surface, the inlet plate being positioned inside of the tubular surface; and
a plurality of swirler guides, each of the swirler guides extending radially inwards from a respective peripheral inlet opening and extending radially inwards from the tubular surface, each of the swirler guides comprising a tab extending upstream, each of the tabs being positioned in a respective one of the tab receiving apertures for positioning the inlet plate relative to the tubular surface, the swirler guides configured to swirl the second portion of the exhaust gas about and into the first portion of the exhaust gas.

10. The power system of claim 9 , wherein there is not an SCR catalyst downstream of the swirler guides, and there is not an ammonia oxidation catalyst downstream of the swirler guides.

11. The power system of claim 9 , further comprising an ammonia oxidation catalyst (AOC) positioned downstream of the SCR catalyst and positioned upstream of the exhaust gas mixer.

12. The power system of claim 9 , wherein each of the swirler guides is positioned completely radially outward from the plate inlet opening.

13. The power system of claim 1 , wherein each swirler guide is bent radially inward from the tubular surface at a bend, and each swirler guide extends circumferentially away from each respective bend, and each bend is parallel to a longitudinal axis of the tubular surface.

14. The power system of claim 1 , wherein the tubular surface is positioned in an outlet cone that tapers radially inwards thereto in a downstream direction and contacts a region downstream of the peripheral inlet openings, and a longitudinal axis of the tubular surface intersects the plate inlet opening.

15. The power system of claim 14 , wherein the outlet cone surrounds the peripheral inlet openings and swirler guides, and the outlet cone is configured to route the second portion of the exhaust gas through the peripheral inlet openings and against the swirler guides.

Assignees

• Deere & Co

Inventors

• Wright Cary L
• Bovee Nathan A
• Gavin Iii William F

Classifications

• F01N2240/20

  a flow director or deflector · CPC title

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title

• B01F5/064

  Operations & Transport · mapped topic

• Y02T10/24

  Cross-Sectional Technologies · mapped topic

• F01N3/2892

  Exhaust flow directors or the like, e.g. upstream of catalytic device · CPC title