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Discharge purifying device

A technology of exhaust purification device and exhaust flow path, which is applied in exhaust device, exhaust treatment, noise reduction device, etc., can solve problems such as difficulty in purifying NOx

Inactive Publication Date: 2008-10-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the contrary, the exhaust gas of a lean-burn engine or a diesel engine contains a lot of oxygen, so it is difficult to purify NOx by using a three-way catalyst

Method used

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  • Discharge purifying device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043] figure 1 It is a schematic diagram showing the basic configuration of the exhaust gas treatment device according to the first embodiment.

[0044] The engine 1 has a plurality of cylinders (not shown), and the exhaust gas combusted in the cylinders is discharged to the outside through a plurality of exhaust manifolds 2 and an exhaust pipe 3 .

[0045] In this exhaust treatment device, an oxidation catalyst unit 8 , a plasma treatment unit 4 , and a NOx purification catalyst unit 5 are provided in this order from upstream on an exhaust pipe 3 forming an exhaust flow path.

[0046] The oxidation catalyst unit 8 has a main passage 31 through which the exhaust gas flows in contact with the oxidation catalyst, and a bypass passage 9 formed at the center where the exhaust gas does not come into contact with the oxidation catalyst.

[0047] The plasma processing unit 4 is connected to a plasma control device 6 and a high voltage power supply 7 . The plasma control device 6 c...

Embodiment approach 2

[0082] Figure 4 It is a schematic diagram showing the basic configuration of the exhaust gas treatment device according to the second embodiment.

[0083] In this embodiment, the exhaust flow path formed by the exhaust pipe 3 has a main flow path 31 carrying an oxidation catalyst and a bypass flow path 9 not carrying an oxidation catalyst.

[0084] Other constitutions are the same as those in Embodiment 1.

[0085] In this embodiment, the piping forming the bypass flow path 9 is made of the same metal pipe as the exhaust pipe 3 .

[0086] The pipe diameter of the bypass passage 9 is determined by the concentration ratio of HC and NOx contained in the exhaust gas, the target concentration ratio, and the like.

[0087] Here, the main channel 31 loaded with the oxidation catalyst is a honeycomb structure, and the bypass channel 9 is a conduit structure. In addition to the diameters of the two, the numerical aperture is considered to determine the pipe diameter of the bypass ch...

Embodiment approach 3

[0094] FIG. 6 is a schematic diagram showing a basic configuration of an exhaust gas treatment device according to Embodiment 3. FIG.

[0095] In this embodiment, in the bypass channel 9 of Embodiment 2, a flow control device 10 is provided.

[0096] The other constitutions are the same as those of Embodiment 2.

[0097] In Embodiments 1 and 2, the sizes of the main flow path 31 and the bypass flow path 9 loaded with the oxidation catalyst are determined according to the concentrations of HC and NOx investigated in advance in the operating conditions of the engine 1, and the ratio of the exhaust gas is set.

[0098] On the contrary, in this embodiment, the bypass flow rate can be changed according to the operating conditions of the engine 1 through the control of the flow control device 10, thereby expanding the range of the operating conditions of the engine 1.

[0099] For example, when the air-fuel ratio of engine 1 is 20, the methane conversion concentration (C1 conversio...

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Abstract

An exhaust gas purification apparatus can efficiently purify an exhaust gas even when hydrocarbon contained in the exhaust gas is excessive with content of hydrocarbon and NOx being substantially different. The apparatus has an oxidation catalyst unit ( 8 ), a plasma processing unit ( 4 ) and a NOx purification catalyst unit ( 5 ) arranged on an exhaust gas flow passage, through which the exhaust gas discharged from an engine ( 1 ) flows, in this order form an upstream side to a downstream side. The oxidation catalyst unit ( 8 ) is provided with a main flow passage ( 31 ) through which the exhaust gas flows while being in contact with an oxidation catalyst, and a bypass flow passage ( 9 ) through which the exhaust gas flows without contacting the oxidation catalyst.

Description

technical field [0001] The present invention relates to an exhaust gas purifying device for purifying harmful components in exhaust gas discharged from an engine. Background technique [0002] Nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC) are contained in exhaust gas discharged from automobile engines as harmful components. [0003] As an existing device for purifying these harmful gases, the residual oxygen (O 2 ) in a very small amount of stoichiometric combustion, the three-way catalyst has been put into practical use. By passing exhaust gas from the engine into this three-way catalyst, harmful gas components are converted into H 2 O.CO 2 , N 2 Wait for clean gas. [0004] On the contrary, since the exhaust gas of a lean-burn engine or a diesel engine contains a lot of oxygen, it is difficult to purify NOx by using a three-way catalyst. [0005] Desiring an exhaust purification device that reduces harmful components emitted from gasoline lean-bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/24B01D53/34
CPCF01N13/009F01N2240/28F01N3/2033Y02T10/26F01N13/02F01N3/106F01N2570/14F01N3/2803F01N3/2053Y02A50/20Y02T10/12
Inventor 佐藤稔仓桥正人白神昭
Owner MITSUBISHI ELECTRIC CORP
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