# US 2024/0200480 A1 · Decomposition chambers for aftertreatment systems

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2024/0200480 A1
- Document ID: US20240200480A1
- Status: Published application
- Kind: A1
- Application number: 18/543,149
- Filed: 2023-12-18
- Published: 2024-06-20
- Earliest claimed: 2022-12-19
- Assignees: Cummins Emission Solutions Inc.
- Applicants: Cummins Emission Solutions Inc.
- Inventors: Yash Pal; Sachin Sharma; Allick Mounir Olive; Donald Edward Willey; Sriram Narayanasamy; Priyanka Vinod Chare; Girish Subramanian; Akash A. Pise; Shubham Kalyankar
- Web page: https://patentgrep.com/patent/US20240200480A1

## CPC

- F01N 3/2066: {Selective catalytic reduction [SCR]}
- B01D 53/9431: {Processes characterised by a specific device}
- F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device}
- B01D 2251/20: Reductants
- B01D 2258/01: Engine exhaust gases
- F01N 2240/20: a flow director or deflector
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/1406: Storage means for substances, e.g. tanks or reservoirs
- F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A decomposition chamber for an aftertreatment system includes an outer conduit that has an inner surface, a doser mount coupled to the outer conduit, and an inner conduit disposed within the outer conduit. The inner conduit has an upstream end, a downstream end, and an outer surface that is spaced from the inner surface of the outer conduit. The inner conduit includes an opening aligned with the doser mount and disposed closer to the upstream end than to the downstream end, and a lip extending along a portion of the opening and angled partially outward and partially toward the upstream end.

## Claims

### Claim 1

A decomposition chamber for an aftertreatment system, the decomposition chamber comprising:
an outer conduit having an inner surface;
a doser mount coupled to the outer conduit;
an inner conduit disposed within the outer conduit, the inner conduit comprising:
an upstream end,
a downstream end,
an outer surface that is spaced from the inner surface of the outer conduit,
an opening aligned with the doser mount and disposed closer to the upstream end than to the downstream end, and
a lip extending along a portion of the opening, the lip angled partially outward and partially toward the upstream end.

### Claim 2 (depends on 1)

The decomposition chamber of claim 1, wherein:
the opening comprises:
a first edge defined by a first radius of curvature, and
a second edge positioned downstream of the first edge and having a second radius of curvature, the second radius of curvature being greater than the first radius of curvature; and
the lip extends along at least a portion of the second edge.

### Claim 3 (depends on 2)

The decomposition chamber of claim 2, wherein:
the first edge extends around a first half of the opening, and
the second edge extends around a second half of the opening.

### Claim 4 (depends on 1)

The decomposition chamber of claim 1, further comprising:
a mixer disposed within the outer conduit and downstream of the inner conduit, the mixer comprising:
a hub, and
a plurality of vanes, each of the vanes coupled to the hub

### Claim 5 (depends on 4)

The decomposition chamber of claim 4, further comprising:
a baffle disposed within the outer conduit and downstream of the mixer, the baffle comprising:
a first portion having a shape of a portion of a cylinder, and
a second portion having a shape of a portion of an annular, the second portion extending radially inward from the first portion.

### Claim 6 (depends on 5)

The decomposition chamber of claim 5, wherein the baffle comprises a baffle angle coverage that ranges between 160 degrees and 180 degrees.

### Claim 7 (depends on 5)

The decomposition chamber of claim 5, further comprising:
an outlet fitting coupled to the downstream end of the outer conduit, the outlet fitting having an upstream opening with a first area, and a downstream opening with a second area larger than the first area, the upstream opening having a first central axis, the downstream opening having a second central axis that is offset from the first central axis; and
a plate disposed in the outlet fitting, the plate having an asymmetrical array of perforations.

### Claim 8 (depends on 1)

The decomposition chamber of claim 1, further comprising:
a spacer disposed around the inner conduit, the spacer comprising:
a body interfacing with the outer surface; and
a plurality of flanges, each of the flanges extending away from the inner conduit and interfacing with the inner surface;
wherein the spacer positions the inner conduit within the outer conduit such that the outer surface is spaced apart from the inner surface.

### Claim 9 (depends on 8)

The decomposition chamber of claim 8, wherein:
each of the flanges has a flange length;
the outer surface is disposed away from the inner surface a distance that corresponds to the flange length; and
the lip has a lip height that is less than the flange length.

### Claim 10 (depends on 1)

The decomposition chamber of claim 1, further comprising:
a first spacer disposed proximate the upstream end, the first spacer comprising:
a first body interfacing with the outer surface, and
a first flange extending away from the inner conduit and interfacing with the inner surface; and
a second spacer disposed proximate the downstream end, the second spacer comprising:
a second body interfacing with the outer surface, and
a second flange extending away from the inner conduit and interfacing with the inner surface;
wherein the first spacer is rotated relative to the second spacer such that the first flange is offset from the second flange.

### Claim 11 (depends on 10)

The decomposition chamber of claim 10, wherein:
the first spacer is disposed a first distance from the upstream end; and
the second spacer is disposed a second distance from the downstream end, the first distance being less than the second distance.

### Claim 12 (depends on 1)

The decomposition chamber of claim 1, further comprising:
a first spacer extending around the inner conduit and disposed proximate the upstream end;
a second spacer extending around the inner conduit and disposed proximate the downstream end;
a mixer disposed in the outer conduit and downstream of the inner conduit;
a baffle disposed in the outer conduit and downstream of the mixer;
an outlet fitting coupled to the outer conduit; and
a plate disposed in the outlet fitting.

### Claim 13 (depends on 12)

The decomposition chamber of claim 12, wherein:
the mixer is disposed a first distance downstream of the downstream end; and
the baffle is disposed a second distance downstream of the mixer, the second distance being greater than the first distance.

### Claim 14 (depends on 12)

The decomposition chamber of claim 12, further comprising an inlet fitting coupled to the outer conduit, the inlet fitting comprising an upstream inlet opening centered on an upstream inlet axis;
wherein the outlet fitting comprises a downstream outlet opening centered on a downstream outlet axis; and
wherein the upstream inlet axis is offset from the downstream outlet axis.

### Claim 15

An aftertreatment system, comprising:
a reductant delivery system, comprising:
a reductant source; and
a dosing module fluidly coupled to the reductant source; and
a decomposition chamber, comprising:
an outer conduit having an inner surface;
a doser mount extending from the outer conduit, wherein the dosing module is coupled to the outer conduit via the doser mount; and
an inner conduit disposed within the outer conduit, the inner conduit comprising an opening aligned with the doser mount
a mixer disposed within the outer conduit and downstream of the inner conduit; and
a baffle disposed within the outer conduit and downstream of the mixer.

### Claim 16 (depends on 15)

The aftertreatment system of claim 15, wherein the inner conduit further comprises:
an upstream end; and
a lip extending along a portion of the opening and angled partially outward and partially toward the upstream end.

### Claim 17 (depends on 16)

The aftertreatment system of claim 16, wherein:
the opening comprises:
a first edge defined by a first radius of curvature, and
a second edge positioned downstream of the first edge and having a second radius of curvature, the second radius of curvature being greater than the first radius of curvature; and
the lip extends along at least a portion of the second edge.

### Claim 18 (depends on 16)

The aftertreatment system of claim 16, wherein the baffle comprises:
a first portion having a shape of a portion of a cylinder; and
a second portion having a shape of a portion of an annular, wherein the second portion extends radially inward from the first portion.

### Claim 19 (depends on 18)

The aftertreatment system of claim 18, wherein the decomposition chamber further comprises:
an outlet fitting coupled to the downstream end of the outer conduit, the outlet fitting having an upstream opening with a first area, and a downstream opening with a second area larger than the first area, the upstream opening having a first central axis, the downstream opening having a second central axis that is offset from the first central axis; and
a plate disposed in the outlet fitting, the plate having an asymmetrical array of perforations.

### Claim 20 (depends on 19)

The aftertreatment system of claim 19, wherein the decomposition chamber further comprises:
a spacer disposed around the inner conduit, the spacer comprising:
a body interfacing with an outer surface of the inner conduit; and
a plurality of flanges, each of the flanges extending away from the inner conduit and interfacing with the inner surface of the outer conduit;
wherein the spacer positions the inner conduit within the outer conduit such that the outer surface is spaced apart from the inner surface.