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Apparatus for reducing nitrogen oxide contained in exhaust gas

a technology of exhaust gas and apparatus, which is applied in the direction of machines/engines, physical/chemical process catalysts, separation processes, etc., can solve the problems of difficult to reduce nosub>x /sub>, thc and co are not fully oxidized, etc., and achieve the effect of reducing the nitrogen oxide contained and reducing the nox

Inactive Publication Date: 2009-06-18
HYUNDAI MOTOR CO LTD +1
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Benefits of technology

[0012]Embodiments of the present invention has been made in an effort to provide an apparatus for reducing nitrogen oxide contained in exhaust gas having advantages of fully oxidizing THC and CO contained in the exhaust gas and sufficiently reducing NOx as a consequence that a SCR device uses NO2 generated when the THC and CO are oxidized.

Problems solved by technology

Therefore, it is difficult to reduce the NOx by using the NO2 generated in the DOC device according to the conventional apparatus for reducing nitrogen oxide contained in exhaust gas.
In addition, since, by applying the EGR technology and the post injection technology to the vehicles, the increased THC and CO are oxidized only in the DOC device, the THC and the CO are not fully oxidized.

Method used

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  • Apparatus for reducing nitrogen oxide contained in exhaust gas
  • Apparatus for reducing nitrogen oxide contained in exhaust gas
  • Apparatus for reducing nitrogen oxide contained in exhaust gas

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Embodiment Construction

[0021]An exemplary embodiment of the present invention will hereinafter be described in detail with reference to the accompanying drawings.

[0022]FIG. 1 is a schematic diagram of an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention.

[0023]As shown in FIG. 1, exhaust gas generated in an engine 10 flows sequentially through a turbo charger 20, a DOC device 30, a CPF device 40, a nozzle 50, and an SCR device 60, and noxious materials contained in the exhaust gas are removed. The turbo charger 20, the DOC device 30, the CPF device 40, the nozzle 50, and the SCR device 60 are mounted on an exhaust pipe 70.

[0024]The engine 10 includes a plurality of cylinders (not shown) for burning an air-fuel mixture. Each cylinder is connected to an intake manifold (not shown) so as to receive the air-fuel mixture, and the intake manifold is connected to an intake pipe (not shown) so as to receive fresh air.

[0025]In addition, each...

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Abstract

An apparatus for reducing NOx contained in exhaust gas as an exemplary embodiment of the present invention may include: a DOC device primarily oxidizing an exhaust materials containing THC and CO in the exhaust gas by using a first DOC; a CPF device mounted downstream of the DOC device to receive the exhaust gas primarily oxidized by the DOC device, further oxidizing the exhaust materials containing the THC and the CO by heat generated during the primary oxidation and an oxidizing agent coated therein, and oxidizing NO in the exhaust gas into NO2 by using the generated heat and the oxidizing agent coated therein; a nozzle mounted downstream of the CPF device, and dosing a reductant to the exhaust gas; and a SCR device mounted downstream of the nozzle, and reducing NOx in the exhaust gas into N2 by using the NO2 generated in the CPF device and the reductant.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Korean Patent Application No. 10-2007-0131563 filed in the Korean Intellectual Property Office on Dec. 14, 2007, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002](a) Field of the Invention[0003]The present invention relates to an exhaust apparatus of vehicles. More particularly, the present invention relates to an apparatus for reducing nitrogen oxide contained in exhaust gas that effectively reduces the nitrogen oxide in the exhaust gas.[0004](b) Description of the Related Art[0005]Generally, exhaust gas flowing out through an exhaust manifold from an engine is driven into a catalytic converter mounted at an exhaust pipe and is purified therein. After that, the noise of the exhaust gas is decreased while passing through a muffler and then the exhaust gas is emitted into the air through a tail pipe. The catalytic converter is a type of ...

Claims

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Application Information

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IPC IPC(8): F01N3/10
CPCB01D53/9418Y02T10/24B01D53/9477B01D2251/2067B01D2255/1021B01D2255/1023B01D2255/20738B01D2255/50B01D2255/915B01D2258/012B01J29/072F01N3/035F01N3/10F01N3/2066F01N3/2073F01N2250/02F01N2570/14F01N2610/00B01D53/944Y02A50/20Y02T10/12F01N3/28F01N3/20
Inventor KIM, CHANG DAELEE, JIN HACHO, JI HO
Owner HYUNDAI MOTOR CO LTD
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