Turbo charged internal-combustion engine for exhaust system with an SCR catalytic equipment

A technology of SCR catalyst and exhaust gas turbine, which is applied to internal combustion piston engines, exhaust gas treatment, exhaust devices, etc., can solve the problems of expensive exhaust gas after-treatment systems, inability to hydrolyze urea, and lower temperature levels.

Active Publication Date: 2007-03-28
MAN NUTZFAHRZEUGE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a hydrolysis catalyst makes the exhaust gas aftertreatment system considerably more expensive than systems which can be adequately applied without such a hydrolysis catalyst
In addition, the hydrolysis catalytic converter, which is arranged in the exhaust tract downstream of the exhaust gas turbocharger, is charged with exhaust gas whose temperature level is already relatively much lower, even below a certain temperature depending on the load situation of the internal combustion engine, with Favorable urea hydrolysis is no longer possible at this temperature

Method used

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  • Turbo charged internal-combustion engine for exhaust system with an SCR catalytic equipment
  • Turbo charged internal-combustion engine for exhaust system with an SCR catalytic equipment
  • Turbo charged internal-combustion engine for exhaust system with an SCR catalytic equipment

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Embodiment Construction

[0026] In the drawing, 1 denotes the exhaust gas turbocharger, 2 denotes the exhaust gas turbine of the exhaust gas turbocharger, and 3 denotes the compressor of the exhaust gas turbocharger. According to the invention, only the exhaust gas turbine 2 is of interest. Here, 4 designates the turbine wheel of the exhaust gas turbine, and 5 designates the turbine body of the exhaust gas turbine. 6 denotes the outer wall of the turbine body, 7 denotes the turbine inlet, and 8 denotes the turbine outlet.

[0027] The turbine inlet 7 of the exhaust gas turbine 2 is connected to an exhaust pipe section, such as an elbow or an exhaust manifold, through which the exhaust gas turbine receives energy from a likewise not shown internal combustion engine, in particular from a diesel engine of a motor vehicle. Exhaust gases from the engine delivered according to arrow 9. Connected to the outlet 8 of the exhaust gas turbine 2 is an exhaust line 10 in which, downstream of the exhaust gas turb...

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Abstract

The invention relates to means of superchargers loaded internal-combustion engine, in particular diesel engine of a vehicle, in whose exhaust strand an exhaust subsequent treatment mechanism with at least one SCR catalyst is intended, ammonia as reducing agent for nitrogen oxide reduction supplyable is characterized, which is generatable in a ammonia reactor from a urea water solution or a solid urea, by the fact that the ammonia reactor (11) outside at the turbine case of the supercharger, whose heat radiation is used for ammonia production.

Description

technical field [0001] The invention relates to an internal combustion engine which is charged by means of an exhaust gas turbocharger and has the features stated in the preamble of claim 1 . Background technique [0002] In order to treat NO in diesel engine exhaust x Selective Catalytic Reduction (SCR), using ammonia (NH 3 ) as a reducing agent. This reducing agent can be produced by thermal decomposition of a urea-water solution or solid urea. There are different variants and different types of ammonia reactors for this purpose. In the simplest case, a urea-water solution is sprayed directly into the hot exhaust gas upstream of the SCR catalytic converter. The disadvantage here is that the vaporized water has a small share and only a small amount of urea is decomposed into ammonia (NH 3 ) and isocyanic acid (HNCO), which reduces the efficiency of the SCR catalyst. Catalytic thermal decomposition of urea-water solutions with the aid of a hydrolysis catalyst in a spli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F02B37/00B01D53/94
CPCF01N2610/12F01N2610/1453F01N2240/40Y02T10/24F02B37/18F01N2610/10F01N3/2066Y02T10/144F01N3/2073F01N3/106F02B37/00F01N2610/02Y02A50/20Y02T10/12
Inventor E·斯蒂尔曼
Owner MAN NUTZFAHRZEUGE AG
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