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Mixing devices for selective catalytic reduction systems

A mixing device, selective technology, used in mixers, exhaust devices, mufflers, etc.

Active Publication Date: 2015-07-15
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This angle is less than 90 degrees

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  • Mixing devices for selective catalytic reduction systems
  • Mixing devices for selective catalytic reduction systems
  • Mixing devices for selective catalytic reduction systems

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Embodiment Construction

[0026] The following description is merely exemplary in nature and is not intended to limit the invention, its application or uses. It should be understood that throughout the drawings, like reference numerals indicate like or corresponding parts and features.

[0027] A mixing device for a selective catalytic reduction (SCR) system is provided in the exhaust pipe upstream of the SCR unit for mixing a urea solution with the exhaust gas. The mixing device includes a perforated body and a plurality of tabs extending outwardly from the perforated body. The apertured body has a first surface, a second surface, and a plurality of channels extending from the first surface to the second surface. The first surface and the second surface are parallel to each other and at an angle to the wall of the exhaust pipe. This angle is less than 90 degrees. This angle can be 0 degrees to reduce pressure drop. The mixing device of the present invention achieves better vaporization and distrib...

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Abstract

A selective catalytic reduction (SCR) system includes an exhaust pipe for receiving an exhaust gas from an engine. A selective catalytic reduction (SCR) unit is provided downstream of the exhaust pipe. A first mixing element including a meshed body defines a first surface, a second surface, and a plurality of openings extending from the first surface to the second surface. The first surface and second surface are parallel to each other and define an angle relative to a flow direction of the exhaust flow. The angle is less than 90 degrees.

Description

technical field [0001] The present invention relates to selective catalytic reduction (SCR) systems for automotive exhaust systems, and more particularly to mixing devices for SCR systems that combine reductant (such as urea) with exhaust gas before reaching the SCR catalyst. The two are mixed. Background technique [0002] The background statement provided herein is for the purpose of generally presenting the context of the disclosure. To the extent described in this Background section, the work of the presently named inventors, and aspects of this description that do not constitute prior art as of the filing date, are neither expressly nor implicitly contemplated as being directed to the present invention. current technology. [0003] Selective catalytic reduction (SCR) systems have been used in motor vehicles to reduce nitrogen oxides (NO x ). The SCR system includes an SCR unit (eg, an SCR catalyst) in which SCR processing is performed. Typically, a liquid reductant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20
CPCF01N3/2066B01F5/0473B01F3/04049Y02T10/24F01N3/2892F01N2610/1453B01F5/0616B01F5/0268F01N2240/20Y02T10/12B01F23/2132B01F25/25B01F25/3141B01F25/4315
Inventor C.E.索尔布里格C.乔施S.H.埃尔 塔里V.S.卡萨
Owner GM GLOBAL TECH OPERATIONS LLC