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Urea mixer

A mixer and urea technology, applied in fluid mixers, mixers, gas/steam and liquid mixing, etc., can solve problems such as urea deposition and poor SCR coating

Inactive Publication Date: 2018-01-30
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, Cho's static mixer can over-agitate the urea injection, which can lead to urea deposits and poor SCR coating

Method used

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  • Urea mixer
  • Urea mixer
  • Urea mixer

Examples

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Embodiment Construction

[0013] The following description relates to a system and method for a urea mixer configured to receive urea injection from an ejector. The urea mixer can be positioned upstream of the SCR catalyst, such as figure 1 Shown. The urea mixer includes an upstream part positioned outside the exhaust pipe and a downstream part positioned inside the exhaust pipe, such as figure 2 Shown. The downstream portion is physically coupled to the inner surface of the exhaust pipe, wherein the opening is positioned around the central axis of the exhaust pipe. The downstream part further includes a plurality of perforations on the curved surface of the downstream part. The hole is positioned between the inner surface of the exhaust pipe and the opening on the curved surface, such as image 3 Shown. In this way, the exhaust gas flows through the opening or perforation when it reaches the downstream portion. Figure 4 An example exhaust flow through a urea mixer is shown in. The exhaust gas is d...

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Abstract

The invention relates to a urea mixer. Methods and systems are provided for a urea mixer. In one example, a urea mixer may include a tube for mixing exhaust gas with urea outside of a main exhaust passage.

Description

Technical field [0001] This specification relates generally to methods and systems for urea mixers. Background technique [0002] A technology for aftertreatment of engine exhaust uses selective catalytic reduction (SCR) to reduce the NO in exhaust x And ammonia (NH 3 ) Some chemical reactions occur between. By injecting urea into the exhaust channel, NH 3 Introduce into the engine exhaust system upstream of the SCR catalyst, or generate NH in the upstream catalyst 3 . Urea decomposes into NH entropy under high temperature conditions 3 . SCR helps NH 3 And NO x The reaction between the NO x Converted into nitrogen (N 2 ) And water (H 2 O). However, as recognized by the present inventors, problems can arise when injecting urea into the exhaust path. In one example, urea may be poorly mixed into the exhaust flow (e.g., the first part of the exhaust flow has a higher urea concentration than the second part of the exhaust flow), which may result in poor SCR coating and in the exha...

Claims

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Application Information

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IPC IPC(8): F01N3/28F01N3/20
CPCF01N2240/20F01N3/2066F01N3/2892F01N2610/02F01N2610/1453Y02T10/12B01F23/2132B01F2025/918B01F25/3141B01F25/31423B01F25/3131B01F25/32B01F25/45211B01F25/4521B01F23/20B01F25/30B01F25/40
Inventor 张小钢
Owner FORD GLOBAL TECH LLC