Exhaust aftertreatment device, including chemical mixing and...

Details Exhaust aftertreatment device, including chemical mixing and... Exhaust aftertreatment device, including chemical mixing and...

2002-02-27

2004-04-20

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S299000, C060S303000

Reexamination Certificate

active

06722123

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to aftertreatment devices for internal combustion engine exhaust, and more particularly to combined chemical mixing and acoustic effects.
To address engine emission concerns, new standards continue to be proposed for substantial reduction of various emissions, including NO
X
and particulate emissions. Increasingly stringent standards will require installation of aftertreatment devices in engine exhaust systems. Some of the aftertreatment technologies require certain chemical species to be injected into the exhaust system. For example, HC or fuel is injected in some active lean NO
X
systems, and additives such as cerium and iron are injected for diesel particulate filter regeneration, and urea solution is injected in selective catalytic reduction (SCR) systems for NO
X
reduction. These injected chemical species need to be well mixed with exhaust gas before reaching catalysts or filters for the systems to perform properly.
Perforated tubes are widely used in engine exhaust systems for noise reduction. If designed properly, perforated tubes can also create high intensity turbulent flow. The turbulent flow will promote turbulent diffusion of the chemical species and therefor enhance the mixing process.
In one aspect of the present invention, improved chemical mixing is provided.
In another aspect, the invention integrates a turbulent mixing tube with an acoustic tube into an engine exhaust system.
In another aspect, the invention provides an engine exhaust system with two-stage perforated tubes. The system is designed not only to reduce the noise level, but also to enhance the mixing processes of chemical species which are injected into the exhaust system, including for regeneration of diesel particulate filters and for controlling engine NO
X
emissions.


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