Method and device for processing the waste gas of an internal combustion engine
A technology for internal combustion engines and exhaust pipes, applied in the field of exhaust gas treatment of internal combustion engines, can solve the problems of hydrolysis catalytic converter damage, catalytic active coating falling off, etc., and achieve the effect of improving sealing
Active Publication Date: 2013-01-02
EMITEC EMISSIONSTECHNIK
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The method described here has the disadvantage that the hydrolysis catalyst is cooled by evaporating the aqueous urea solution
Especially when large quantities of ammonia are required, at least in local areas of the hydrolysis catalyst, this leads to an intense cooling, so that the hydrolysis catalyst is no longer or no longer fully operational here
In addition, the hydrolysis catalyst can be damaged due to locally intense intermittent cooling of the hydrolysis catalyst due to the evaporation of individual droplets, in particular the catalytically active coating can be detached
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0171] Figure 1 schematically shows a device 1 for preparing a gas mixture comprising at least one of the following substances:
[0172] a) at least one reducing agent, and
[0173] b) at least one reducing agent precursor.
[0174] This is in particular the reducing agent ammonia and the reducing agent precursor urea. The device 1 comprises an addition duct 2 with a distribution hole 3 . Furthermore, means 4 for heating the addition line 2 are formed, by means of which the addition line 2 is heated to a first critical temperature above the boiling temperature of water. The device 1 also includes a storage tank, not shown here, which is fluidically connected to the addition line 2 . That is, in particular a fluid stored in the storage tank, such as an aqueous solution comprising at least one reducing agent precursor, can flow through the addition line 2 to the distribution opening 3 during operation. With this device 1 a gas mixture can be produced which contains at least ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| volume | aaaaa | aaaaa |
Login to View More
Abstract
The device (15) has a reducing agent solution evaporator (16), a hydrolysis catalyst that is connected to the reducing agent solution evaporator for hydrolysing. A selective catalytic reduction catalyst (18) for selective catalytic reduction of nitrogen oxides. An aqueous solution has a reducing agent precursor that is evaporated by the evaporator unit. The reducing agent solution precursor and a hydrolysis catalyst (17) are mounted and connected to a waste gas line (14). A connecting unit (11) is provided that is made from a ceramic material or poly tetra fluoro ethylene. An independent claim is also included for a method for processing the waste gas of an internal combustion engine, which involves producing a reducing agent.
Description
technical field [0001] The invention relates to a method and a device for treating the exhaust gas of an internal combustion engine, wherein the nitrogen oxide content in the exhaust gas of an internal combustion engine is reduced by selective catalytic reduction. Background technique [0002] The exhaust gas of an internal combustion engine has substances which it is undesirable to emit into the environment. For example, nitrogen oxides (NOx) are only permitted up to a certain limit value in the exhaust gas of internal combustion engines in many countries. In addition to the internal measures of the engine, after-treatment methods are also adopted. The internal measures of the engine can reduce the emission of nitrogen oxides by selecting a suitable operating point of the internal combustion engine, and the after-treatment methods can further reduce nitrogen oxides. [0003] A method for further reducing nitrogen oxide emissions is the so-called selective catalytic reducti...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90F01N3/20B01D53/94
CPCB01D53/9431F01N2900/1811F01N2240/40Y02T10/24B01D53/90F01N2610/06F01N2610/10F01N3/208F01N2610/11B01D2251/2067F01N2610/14F01N2610/02Y02T10/12B01D53/94F01N3/20
Inventor R·布吕科M·布鲁格尔T·黑里希P·希尔特U·克列宁
Owner EMITEC EMISSIONSTECHNIK