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Emission control system and reductant injector

An emission control system and reductant technology, which is applied to the electronic control of exhaust treatment devices, exhaust devices, exhaust treatment, etc. Exhaust back pressure and other issues

Active Publication Date: 2017-10-20
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mixing devices can be costly, bulky and increase exhaust back pressure
In addition, the mixing device did not significantly improve reductant atomization and evaporation in the exhaust system
Therefore, the mixing device may prevent the SCR catalyst from achieving the desired NO x conversion level

Method used

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  • Emission control system and reductant injector
  • Emission control system and reductant injector
  • Emission control system and reductant injector

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Embodiment Construction

[0011] Described herein is an exhaust system with a reductant injector that promotes flow mixing, reductant atomization, and increased reductant evaporation. Increased reductant evaporation may be achieved by an exhaust passage running immediately adjacent to (eg, between) the reductant passage in the interior of the reductant injector and fluidly separate from the reductant passage. Exhaust flow passing through the reductant injector enables heat to be transferred from the hot exhaust to the reductant via the common wall separating the reductant and exhaust, thereby increasing the temperature of the reductant. Consequently, evaporation of the reducing agent in the exhaust flow injected into the exhaust duct is increased. Additionally, the reductant flowing from the reductant injector may have a high pressure. Atomization of the injected reductant is increased when the reductant flow at high pressure is injected adjacent to the exhaust flow traveling through the reductant inj...

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Abstract

The invention provides an emission control system and a reductant injector. The emission control system for an engine is described herein. The emission control system includes a reductant injector extending into an exhaust conduit upstream of a catalyst. The reductant injector includes a reductant passage selectively receiving reductant from a reductant reservoir, an exhaust gas inlet receiving exhaust gas from the exhaust conduit, and an interior exhaust passage adjacent to the reductant passage, the interior exhaust passage receiving exhaust gas from the exhaust gas inlet and fluidly separated from the reductant passage.

Description

technical field [0001] This application relates to emission control systems and reductant injectors. Background technique [0002] Engines can implement a strategy called Selective Catalytic Reduction (SCR) to reduce engine emissions in the exhaust system. SCR is a process in which a gaseous or liquid reductant (eg, ammonia, urea, etc.) is introduced into the exhaust pipe upstream of the catalyst. The SCR strategy reduces the NO in the exhaust stream x Convert to N 2 and water, thereby reducing engine emissions and thus reducing the engine's impact on the environment. However, many factors can affect SCR performance. For example, reduced reductant injection atomization caused by low pressure reductant injection can negatively impact SCR operation. Reduced reductant evaporation also reduces NO in the catalyst during cold start, for example x convert. Incomplete flow mixing of reductant and exhaust gas also reduces NO in the catalyst x convert. In previous emission co...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/206F01N3/208F01N9/00F01N2570/14F01N2610/02F01N2610/1453F01N2610/146F01N2900/1404Y02T10/12
Inventor 张小钢
Owner FORD GLOBAL TECH LLC
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