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Method and system for purifying the exhaust gases of a combustion engine

A technology for exhausting gas and internal combustion engines, applied to chemical instruments and methods, separation methods, inorganic chemistry, etc., to achieve simple and safe production and use

Inactive Publication Date: 2016-04-20
PLASTIC OMNIUM ADVANCED INNOVATION & RES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even when this is done, it will take some time to thaw enough urea solution and inject it into the discharge line

Method used

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  • Method and system for purifying the exhaust gases of a combustion engine
  • Method and system for purifying the exhaust gases of a combustion engine
  • Method and system for purifying the exhaust gases of a combustion engine

Examples

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Embodiment Construction

[0050] figure 1 It is a schematic diagram of the SCR system according to the first specific embodiment of the present invention.

[0051] Such as figure 1 As shown in the example, the system includes:

[0052] - a container (i.e. tank) 1 for storing the ammonia precursor solution; and

[0053] - A decomposition and storage unit 2 located inside the tank 1 .

[0054] In a specific embodiment, the storage tank 1 stores an aqueous urea solution, such as solution (commercially available urea solution).

[0055] exist figure 1 In the example of , the decomposition and storage unit 2 includes biological agents 3 (ie protein components or protein sequences). This biological agent 3 is suitable for decomposing the urea stored in the tank 1 . More precisely, biological agent 3 is suitable for converting urea into ammonia solution (ie ammonia water). For example, enzymes such as urease can be used to break down urea. Of course, other suitable protein sequences can be used. ...

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Abstract

SCR method for purifying the exhaust gases of an internal combustion engine of a vehicle, according to which an ammonia precursor is stored in a container (1) mounted on board the vehicle. The method is such that it comprises the steps of: decomposing one part of the ammonia precursor into an aqua ammonia; storing the aqua ammonia in a unit (2) mounted on board the vehicle; metering the stored aqua ammonia into the exhaust gases.

Description

technical field [0001] The present invention relates to methods and systems for purifying combustion engine exhaust gases. Background technique [0002] Legal regulations on vehicle and truck emissions include reducing the release of nitrogen oxides NOx into the atmosphere. A known way of achieving this goal consists in using the SCR (Selective Catalytic Reduction) method, which enables the reduction of nitrogen oxides by injecting a reducing agent, typically ammonia, into the exhaust line. This ammonia can be obtained by using different techniques. [0003] One known technique is based on the use of an ammonia precursor, such as an aqueous urea solution (eutectic solution of 32.5 wt% ammonia in water). Typically, the urea solution is stored in a container mounted on the vehicle. Urea solution is injected into the discharge line and gaseous ammonia is produced from the high temperature (thermal) decomposition of the injected urea solution. In the case of a cold start, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20C01C1/00B01D53/90
CPCB01D53/90F01N3/2066B01D2251/2062F01N2610/02F01N2610/10F01N2610/105F01N2610/12F01N2610/1406B01D53/9418B01D2251/2067B01D2257/404B01D2258/012F01N3/208Y02A50/20Y02T10/12B01D53/9431F01N3/2896
Inventor 弗朗索瓦·道尼尔多米尼克·马杜J-J·范夏夫汀根
Owner PLASTIC OMNIUM ADVANCED INNOVATION & RES SA