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Method for preventing formation of urea-based deposits and exhaust passage having coating

A technology for exhaust channels and deposits, which is applied in exhaust treatment, exhaust devices, machines/engines, etc., can solve problems such as shortcomings that have not been eliminated, and achieve the effects of saving materials, increasing service life, and improving effectiveness

Pending Publication Date: 2020-07-24
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages mentioned above about DE 11 2010 000 713 T5 were not eliminated

Method used

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  • Method for preventing formation of urea-based deposits and exhaust passage having coating
  • Method for preventing formation of urea-based deposits and exhaust passage having coating

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Embodiment Construction

[0059] figure 1 The sequence of the method for preventing the formation of urea-based deposits in the exhaust tract 1 of an internal combustion engine 2 is shown. In a first process step S1 , those regions of the exhaust duct 1 where there is a risk of forming urea-based deposits are identified. For example, this can be the area between the spraying device 7 and the SCR or SDPF catalytic converter 13 arranged downstream of the spraying device 7 . Since the spraying device 7 is used to introduce an aqueous urea solution into the exhaust gas 8, there is a risk that urea-based deposits will form in the region of the spraying device 7 and downstream of the spraying device 7, for example, water evaporates from the aqueous urea solution and Urea precipitates prior to urea deposition. The formation of urea-based deposits depends, inter alia, on the temperature of the exhaust gas 8 , the temperature of the exhaust duct 1 (eg the temperature of the pipes belonging to the exhaust duct...

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Abstract

The invention relates to a method for preventing the formation of urea-based deposits in an exhaust duct 1 of an internal combustion engine 2. The method comprises identifying a region (S1) of the exhaust duct 1 at risk of urea-based deposit formation, determining a degree of spatial resolution of the risk of urea-based deposit formation in the identified region (S2), and applying a coating 3 formed for catalytically decomposing an aqueous urea solution and / or urea-based deposits to the identified region (S3) according to the determined degree. Furthermore, an exhaust duct 1 for an internal combustion engine 2 has a coating 3, which is configured for catalytically decomposing urea-based deposits, in the region of the exhaust duct 1 at risk of urea-based deposit formation, the coating 3 having a varying layer thickness 4 and / or varying composition.

Description

technical field [0001] The invention relates to a method for preventing the formation of urea-based deposits in an exhaust tract of an internal combustion engine and to a coated exhaust tract for an internal combustion engine. Background technique [0002] A major challenge in the development of lean-burn engines and corresponding drive systems is the reduction of nitrogen oxide emissions in a substantially oxidizing environment under different operating conditions. [0003] The use of SCR (Selective Catalytic Reduction) exhaust gas aftertreatment devices is one of the important possibilities for removing nitrogen oxides from exhaust gases by catalytic conversion into non-toxic substances (ie nitrogen and oxygen) and thus reducing nitrogen oxide emissions. SCR technology is characterized by its robustness and the high conversion rates that can be achieved. In addition to pure SCR catalytic converters, particle filters with SCR coating, hereinafter referred to as SDPF cataly...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N13/08F01N13/16
CPCF01N3/2066F01N13/08F01N13/16F01N2570/14F01N2610/02
Inventor 简·哈尔姆森罗伯特·屋罗佩茨玛蒂娜·赖歇特玛丽亚·阿尔米恩多
Owner FORD GLOBAL TECH LLC
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