Method and apparatus for gaseous mixing in a diesel exhaust system

Inactive Publication Date: 2011-09-15
INT ENGINE INTPROP CO LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007]There is disclosed herein an improved diesel exhaust treatment system and method which avoid disa

Problems solved by technology

Diesel exhaust, however, can harm both the environment and people.
Additional equipment can often lead to additional weight and/or additional packaging length.
Such engines are said to run “lean” or on a “lean mixture.” However, the increase in fuel efficiency is offset by the creation of undesirable pol

Method used

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  • Method and apparatus for gaseous mixing in a diesel exhaust system
  • Method and apparatus for gaseous mixing in a diesel exhaust system
  • Method and apparatus for gaseous mixing in a diesel exhaust system

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Embodiment Construction

[0018]While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to embodiments illustrated.

[0019]Referring to FIG. 1, there is illustrated a typical mixer / injector device. Exhaust is discharged from the diesel engine 100, through conduit such as exhaust piping to an exhaust treatment system 110. The exhaust treatment system 110 typically consists of, in downstream order, a diesel oxidation catalyst (DOC) 112, a diesel particulate filter (DPF) 114, a mixer / NH3 treatment canister 116, and a NOx slip catalyst (NSC) 118. The DOC 112, DPF 114 and NSC 118 are additional exhaust treatment structures present in most diesel exhaust treatment systems and which form no part of the...

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Abstract

A mixing device and method for a diesel exhaust system is disclosed having a chamber, a mixer within the chamber, and an injection tube supported on the mixer within the chamber. The mixer is positioned within the chamber adjacent an inlet and includes a plurality of angled blades to effect turbulent flow in a diesel exhaust stream entering the chamber through the inlet. The injection tube includes a plurality of injection points (e.g., openings) for discharging a reagent, such as gaseous ammonia (NH3), into the exhaust stream. The injection tube is curved, and more specifically it is coiled with the injection points spread along the length of the tube in order to deliver reagent across a section of the chamber perpendicular to the exhaust stream flow.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to an apparatus and method for treating and mixing diesel exhaust in a diesel exhaust system. Particularly, the present invention provides methods and apparatus for injecting reagent into a diesel exhaust stream to reduce nitrogen oxides (NOx) without increasing the packing space of the exhaust system.BACKGROUND OF THE INVENTION[0002]Diesel engines are efficient, durable and economical. Diesel exhaust, however, can harm both the environment and people. To reduce this harm, governments, such as the United States and the European Union, have proposed stricter diesel exhaust emission regulations. These environmental regulations require diesel engines to meet the same pollution emission standards as gasoline engines.[0003]Typically, to meet such regulations and standards, systems require equipment additions and modifications. Additional equipment can often lead to additional weight and / or additional packaging length.[00...

Claims

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Application Information

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IPC IPC(8): F01N3/00F01N3/02F01N3/035F01N3/10
CPCB01F3/04049F01N13/009B01F5/0453B01F5/0466B01F5/0618B01F2005/0621F01N3/035F01N3/103F01N3/106F01N3/2892F01N2340/02F01N2610/02F01N2610/1453F01N13/0097B01F5/0451B01F23/2132B01F25/3132B01F25/31332B01F25/3131B01F25/4316B01F25/4317
Inventor GRIFFIN, GREGORY A.MILLER, MICHAEL J.YOON, TIMOTHY
Owner INT ENGINE INTPROP CO LLC
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