Centerline injection system for liquid-only reductant delivery

Patent metadata

Field	Value
Publication number	US-9957868-B2
Application number	US-201514973871-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Dec 26, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A centerline injection system for a liquid-only reductant delivery. An aftertreatment system comprises an aftertreatment component structured to treat exhaust exiting an engine, a reactor pipe, and a liquid-only dosing unit. The reactor pipe is positioned upstream of the aftertreatment component and is structured to receive the exhaust from the engine. The liquid-only dosing unit is structured to inject diesel exhaust fluid into the exhaust received from an engine. The liquid-only dosing unit injects the diesel exhaust fluid at the centerline of the reactor pipe as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component.

First claim

What is claimed:

1. An aftertreatment system, comprising:
an aftertreatment component structured to treat exhaust exiting an engine;
a reactor pipe positioned upstream of the aftertreatment component, the reactor pipe structured to receive the exhaust from the engine;
a liquid-only dosing unit structured to inject diesel exhaust fluid into the exhaust received from the engine, wherein the liquid-only dosing unit injects the diesel exhaust fluid at a centerline of the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component; and
a knife-edge mount structured to mount the liquid-only dosing unit injector inside the reactor pipe, the knife edge mount comprising:
a leading edge comprising a knife edge structure, the leading edge pointing towards an oncoming exhaust flow of the exhaust, and
a trailing edge comprising a knife edge structure, the trailing edge pointing away from the exhaust flow.

2. The system of claim 1 , wherein:
the reactor pipe possess a converging geometry towards at least one end of the reactor pipe; and
the knife-edge structure and the converging geometry of the reactor pipe provide insulation from the exhaust gases for protection of the liquid-only dosing unit.

3. The system of claim 1 , wherein:
the reactor pipe possess a converging geometry towards at least one end of the reactor pipe; and
the knife-edge structure and the converging geometry of the reactor pipe serve to minimize pressure drop and recirculation zones of the exhaust.

4. The system of claim 1 , wherein the liquid-only dosing unit injects the diesel exhaust fluid at the centerline of the exhaust flowing through the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component.

5. The system of claim 1 , wherein the reactor pipe comprises a plurality of converging walls structured to converge towards at least one end of the reactor pipe.

6. The system of claim 1 , wherein the knife-edge mount is fully sealed so as to prevent leakage of the exhaust out of the reactor pipe.

7. The system of claim 1 , wherein the reactor pipe comprises one or more ports configured to receive one or more coolant lines, electrical lines, and reductant supply lines.

8. The system of claim 1 , wherein the momentum of the exhaust through the reactor pipe promotes mixing of the diesel exhaust fluid injected at the centerline of the reactor pipe.

9. A centerline injection system for injecting diesel exhaust fluid into exhaust exiting an engine, the centerline injection system comprising:
a reactor pipe positioned upstream of an aftertreatment component configured to treat the exhaust exiting the engine, the reactor pipe structured to receive the exhaust from the engine;
a liquid-only dosing unit structured to inject diesel exhaust fluid into the exhaust, wherein the liquid-only dosing unit injects the diesel exhaust fluid at a centerline of the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component; and
a knife-edge mount structured to mount the liquid-only dosing unit injector inside the reactor pipe, the knife-edge mount having a trailing edge and a leading edge, each having a knife edge structure so as to minimize recirculation zones and exhaust deviation, the trailing edge pointing away from the exhaust flow of the exhaust, and the leading edge pointing towards the oncoming exhaust flow.

10. The system of claim 9 , wherein the liquid-only dosing unit injects the diesel exhaust fluid at the centerline of the exhaust flowing through the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component.

11. The system of claim 9 , wherein the reactor pipe comprises a plurality of converging walls structured to converge toward one or more ends of the reactor pipe.

12. The system of claim 9 , wherein the knife-edge mount is fully sealed so as to prevent leakage of the exhaust out of the reactor pipe.

13. The system of claim 9 , wherein the reactor pipe and the knife-edge mount comprises one or more ports configured to receive one or more coolant lines, electrical lines, and reductant supply lines.

14. An aftertreatment system, comprising:
an aftertreatment component structured to treat exhaust exiting an engine;
a reactor pipe positioned upstream of the aftertreatment component, the reactor pipe structured to receive the exhaust from the engine, the reactor pipe possessing a converging geometry towards at least one end of the reactor pipe;
a liquid-only dosing unit structured to inject diesel exhaust fluid into the exhaust received from the engine, wherein the liquid-only dosing unit injects the diesel exhaust fluid at a centerline of the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component; and
a knife-edge mount structured to mount the liquid-only dosing unit injector inside the reactor pipe, the knife-edge mount having a leading edge and a trailing edge, at least one of the leading edge and the trailing edge comprising a knife-edge structure,
wherein the knife-edge structure and the converging geometry of the reactor pipe provide insulation from the exhaust gases for protection of the liquid-only dosing unit.

15. An aftertreatment system, comprising:
an aftertreatment component structured to treat exhaust exiting an engine;
a reactor pipe positioned upstream of the aftertreatment component, the reactor pipe structured to receive the exhaust from the engine, the reactor pipe possessing a converging geometry towards at least one end of the reactor pipe;
a liquid-only dosing unit structured to inject diesel exhaust fluid into the exhaust received from the engine, wherein the liquid-only dosing unit injects the diesel exhaust fluid at a centerline of the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component; and
a knife-edge mount structured to mount the liquid-only dosing unit injector inside the reactor pipe, the knife-edge mount having a leading edge and a trailing edge, at least one of the leading edge and the trailing edge comprising a knife-edge structure,
wherein the knife-edge structure and the converging geometry of the reactor pipe serve to minimize pressure drop and recirculation zones of the exhaust.

16. An aftertreatment system, comprising:
an aftertreatment component structured to treat exhaust exiting an engine;
a reactor pipe positioned upstream of the aftertreatment component, the reactor pipe structured to receive the exhaust from the engine, the reactor pipe comprising a plurality of converging walls structured to converge towards at least one end of the reactor pipe; and
a liquid-only dosing unit structured to inject diesel exhaust fluid into the exhaust received from the engine, wherein the liquid-only dosing unit injects the diesel exhaust fluid at a centerline of the reactor pipe so as to provide uniform dispersion of the diesel exhaust fluid across at least a part of the aftertreatment component.

17. An aftertreatment system, comprising:
an aftertreatment component structured to treat exhaust exiting an engine;
a reactor pipe positioned upstream of the aftertreatment component, the reactor pipe structured to receive the exhaust from the engine, the reactor pipe comprising one or more ports configured to receive one or more coolant line

Assignees

• Cummins Emission Solutions Inc

Inventors

• Johnson Samuel

Classifications

• B01D2251/2067

  Urea · CPC title

• Y02T10/24

  Cross-Sectional Technologies · mapped topic

• F01N3/28

  Construction of catalytic reactors · CPC title

• B01D2259/124

  Liquid reactants · CPC title

• B01D53/9431

  Processes characterised by a specific device · CPC title