Aftertreatment Module with Reduced Bypass Flow

Patent metadata

Field	Value
Publication number	US-2016348558-A1
Application number	US-201514724438-A
Country	US
Kind code	A1
Filing date	May 28, 2015
Priority date	May 28, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

An aftertreatment module includes a catalytic brick having upstream and downstream flanges sized to extend over potential leak flow paths between bricks. Additionally, an aftertreatment module has an array of similarly flanged bricks to reduce leakage through all interfaces between adjacent bricks. A frame for holding the array of bricks includes flow modulators to restrict leakage through an interface between the frame and at least one side surface defined by the array of bricks.

First claim

What is claimed is:

1 . A catalytic brick for use in an aftertreatment system having a catalytic module frame defining a frame aperture, the catalytic brick comprising:
a brick mantle having first, second, third, and fourth side walls extending from a brick mantle upstream end to a brick mantle downstream end, the first side wall being adjacent to the second side wall, the brick mantle defining a brick mantle aperture; a catalyst material disposed in the brick mantle aperture; a first upstream flange extending outwardly from the first side wall of the brick mantle at the brick mantle upstream end; a first downstream flange extending outwardly from the first side wall of the brick mantle at the brick mantle downstream end; a second upstream flange extending outwardly from the second side wall of the brick mantle at the brick mantle upstream end; and a second downstream flange extending outwardly from the second side wall of the brick mantle at the brick mantle downstream end.

2 . The catalytic brick of claim 1 , in which the first and third walls are spaced from and substantially parallel to each other, and in which the second and fourth walls are spaced from and substantially parallel to each other.

3 . The catalytic brick of claim 2 , in which the brick mantle has a substantially square profile.

4 . The catalytic brick of claim 1 , in which each of the first and second upstream flanges and the first and second downstream flanges is formed of steel.

5 . The catalytic brick of claim 4 , in which each of the first and second upstream flanges and the first and second downstream flanges is welded to the brick mantle.

6 . The catalytic brick of claim 1 , in which the first downstream flange is sufficiently spaced from the first upstream flange to receive a side wall of a second brick having a second brick mantle configured the same as the brick mantle.

7 . The catalytic brick of claim 6 , in which the second downstream flange is sufficiently spaced from the second upstream flange to receive a side wall of a third brick having a third brick mantle configured the same as the brick mantle.

8 . An array of catalytic bricks for an aftertreatment system, comprising:
first catalytic brick including:
a first brick mantle having a first side wall extending from a first brick mantle upstream end to a first brick mantle downstream end, the first brick mantle defining a first brick mantle aperture; and
a catalyst material disposed in the first brick mantle aperture; and
a second catalytic brick disposed adjacent the first side wall of the first brick mantle and including:
a second brick mantle having a first side wall disposed toward the first side wall of the first brick mantle, the first side wall of the second brick mantle and the first side wall of the first brick mantle defining a first brick interface between the first catalytic brick and the second catalytic brick, the second brick mantle defining a second brick mantle aperture;
a catalyst material disposed in the second brick mantle aperture;
a first upstream flange extending outwardly from the first side wall of the second brick mantle at the second brick mantle upstream end; and
a first downstream flange extending outwardly from the first side wall of the second brick mantle at the second brick mantle downstream end;
the first downstream flange being sufficiently spaced from the first upstream flange to receive the first side wall of the first brick mantle; and
each of the first upstream flange and the first downstream flange being configured to traverse the first brick interface between the first catalytic brick and the second catalytic brick.

9 . The array of catalytic bricks of claim 8 , in which each of the first brick mantle and the second brick mantle has a square shape.

10 . The array of catalytic bricks of claim 8 , in which:
the second brick mantle further comprises a second side wall adjacent the first side wall; and the second catalytic brick further includes:
a second upstream flange extending outwardly from the second side wall of the second brick mantle at the second brick mantle upstream end; and
a second downstream flange extending outwardly from the second side wall of the second brick mantle at the second brick mantle downstream end.

11 . The array of catalytic bricks of claim 10 , further comprising a third catalytic brick disposed adjacent the second side wall of the second brick mantle and including a third brick mantle having a first side wall extending from a third brick mantle upstream end to a third brick mantle downstream end, the third brick mantle defining a third brick mantle aperture;
a catalyst material disposed in the third brick mantle aperture; the second side wall of the second brick mantle and the first side wall of the third brick mantle defining a second brick interface between the second catalytic brick and the third catalytic brick; the second downstream flange being sufficiently spaced from the second upstream flange to receive the first side wall of the third brick mantle; and each of the second upstream flange and the second downstream flange being configured to traverse the second brick interface between the second catalytic brick and the third catalytic brick.

12 . The array of catalytic bricks of claim 11 , in which the first side wall of the second brick mantle extends vertically and the second side wall of the second brick mantle extends horizontally.

13 . A catalytic module for an aftertreatment system, comprising:
a catalytic module frame defining a frame aperture, a first frame wall of the catalytic module bordering on the frame aperture; a catalyst assembly disposed in the frame aperture, the catalyst assembly including a mantle having a first side wall disposed toward the first frame wall, the first side wall of the mantle and the first frame wall defining a first frame interface between the catalyst assembly and the catalytic module frame, the mantle defining a mantle aperture holding a catalyst material; and a first flow modulator slidably coupled to the catalytic module frame, the first flow modulator having a body panel defining an inner edge disposed toward the frame aperture, the first flow modulator being movable relative to the catalytic module frame in a first sliding direction to engage the inner edge of the first flow modulator with the first side wall of the mantle so that the body panel of the first flow modulator traverses the first frame interface between the catalyst assembly and the catalytic module frame.

14 . The catalytic module of claim 13 , in which the first flow modulator includes a connection end coupled to the catalytic module frame, the connection end including at least one elongate slot extending parallel to the to the first sliding direction and sized to receive a fastener configured to releasably secure the first flow modulator to the catalytic module frame.

15 . The catalytic module of claim 13 , in which the first flow modulator is formed of a stainless steel material.

16 . The catalytic module of claim 13 , in which the catalyst assembly comprises an array of catalytic bricks, each catalytic brick having a brick mantle, and in which the mantle of the catalyst assembly comprises the brick mantles of the catalytic bricks.

17 . The catalytic module of claim 13 , in which
the catalytic module frame includes a second frame wall bordering on the frame aperture; the mantle of the catalyst assembly includes a second side wall disposed toward the second frame wall, the second side wall of th

Assignees

• Caterpillar Inc

Inventors

• Garduno Juan A
• Deason James
• Justin Julian
• Richey R Zachary
• Deng Ling
• Peltier James D

Classifications

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title

• F01N3/28

  Construction of catalytic reactors · CPC title

• B01D53/9431

  Processes characterised by a specific device · CPC title

• B01D2258/012

  Diesel engines and lean burn gasoline engines · CPC title

• B01D53/9418

  for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas · CPC title