Exhaust gas after-treatment unit with countercurrent housing and corresponding process for exhaust gas after-treatment

A technology of exhaust gas post-treatment and equipment, applied in exhaust gas treatment, mechanical equipment, gas passages, etc., can solve problems such as limited space and large heat load of catalytic converters, and achieve the purpose of improving service life, avoiding thermal gradients, and uniform heating. Effect

Inactive Publication Date: 2006-07-26
EMITEC EMISSIONSTECHNIK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the available space for arranging the catalytic converter is usually very limited, especially in the vicinity of the engine
On the other hand, installation close to the engine results in a high thermal load on the catalytic converter due to the resulting temperature gradients and strong pulsating airflow

Method used

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  • Exhaust gas after-treatment unit with countercurrent housing and corresponding process for exhaust gas after-treatment
  • Exhaust gas after-treatment unit with countercurrent housing and corresponding process for exhaust gas after-treatment
  • Exhaust gas after-treatment unit with countercurrent housing and corresponding process for exhaust gas after-treatment

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Embodiment Construction

[0039] FIG. 1 schematically shows a longitudinal section through a first exemplary embodiment of an exhaust gas aftertreatment device 1 according to the invention. The exhaust gas aftertreatment device 1 has a housing 2 with a honeycomb body 3 which serves as a catalytic converter. The honeycomb body 3 is surrounded by a sleeve 4 and fastened in the housing 2 by fastening means 5 . The fastening device 5 is preferably designed as a web which does not significantly reduce the freely permeable cross-section of the recirculation zone 6 . A free-flowing cross-section means in particular that no honeycomb structures are formed in the recirculation zone. The honeycomb body 3 can be designed both as a ceramic and as a metallic honeycomb body 3 . figure 2 An example of a metal honeycomb is shown. The inlet pipe 13 is provided with a conical section 35 which directs the exhaust gas directly to the first end side 14 of the honeycomb body 3 . The cone 35 has an opening angle of at le...

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Abstract

The invention relates to an exhaust gas aftertreatment installation (1), especially for use near the internal combustion engine of an automobile. Said installation comprises a housing (2), having a catalytic converter (3), surrounded by at least one return flow area (6) through which the fluid can flow in a substantially free manner. Said catalytic converter (3) has a first face (14), a second face (16) and cavities (10) through which a fluid can flow in a forward flow direction (15). The first face (14) of the at least one catalytic converter (3) is linked with at least one gas supply pipe (13) and at least one gas discharge pipe (25) is linked with the at least one return flow area (6) in a substantially gas-tight manner. At least one flow deflection means (17) effects deflection (20) of the fluid from the catalytic converter (3) to the return flow area (6) of the housing (2) through which the fluid can flow in a substantially free manner. The inventive exhaust gas aftertreatment installation (1) is compact in design, has a better light-off performance and reduced alternating thermal stresses as compared to conventional exhaust gas aftertreatment installations.

Description

technical field [0001] The invention relates to an exhaust gas aftertreatment device with a counterflow housing and a corresponding exhaust gas aftertreatment method. Background technique [0002] Due to the continuous increase in the scale of automobile traffic, many countries in the world have announced the limit value that the load of harmful substances in automobile exhaust gas must not exceed. The limit value is regularly reduced, so that the expenditure on the conversion of pollutants in the exhaust gas must be increased to meet the limit value. In this case, a catalytic conversion of the exhaust gas is carried out, in which the harmful constituents of the exhaust gas are converted into harmless constituents. Such catalytic conversions require as large a reaction surface area as possible, but the components used therein must not be so large that the space generally available in motor vehicles is exceeded. A solution to this is to provide honeycomb bodies as catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N7/10F01N13/04F01N13/10
CPCF01N3/2892F01N2470/16F01N2470/14F01N3/2842F01N3/2825F01N2013/045F01N3/2889F01N2013/026F01N2470/24F01N2470/22F01N3/281F01N13/10F01N2470/08F01N2240/20F01N13/017F01N13/0097Y02A50/20
Inventor R·布吕科
Owner EMITEC EMISSIONSTECHNIK
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