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Process for purifying exhaust gases and apparatus for purifying exhaust gases

A technology of exhaust flow and supply device, which is applied to exhaust devices, chemical instruments and methods, separation methods, etc., can solve the problem of difficult to use ozone to remove PMs, etc., and achieve the effect of effective removal

Inactive Publication Date: 2008-04-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, catalyst components, or metal oxides used to support catalyst components, may decompose ozone
Therefore, in conventional filter catalysts, it is difficult to remove PMs by oxidation using ozone

Method used

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  • Process for purifying exhaust gases and apparatus for purifying exhaust gases
  • Process for purifying exhaust gases and apparatus for purifying exhaust gases
  • Process for purifying exhaust gases and apparatus for purifying exhaust gases

Examples

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Embodiment Construction

[0035] Having generally illustrated the invention, it is further described by reference to specific preferred embodiments which are provided herein for purposes of illustration only and are not intended to limit the scope of the appended claims.

[0036]According to the exhaust purification method of the present invention, in the step of trapping PMs, PMs are firstly trapped with a filter. As for the exhaust gas, there may be exemplary PMs-containing exhaust gas such as exhaust gas emitted from a diesel engine.

[0037] The filter traps PMs by filtering only the gas components in the exhaust gas. For example, the filter can consist of metal foam or heat-resistant non-woven fabric. Alternatively, filters can be made of heat-resistant ceramics such as cordierite and silicon carbide. As one of such filters, a wall flow structure DPF has been known. The wall flow structure DPF includes: an inlet unit inserted on the downstream side of the exhaust flow; an outlet unit located ne...

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Abstract

The present invention relates to a process for purifying exhaust gases and an exhaust-gas purifying apparatus utilizing the exhaust-gas purifying process. A process for purifying exhaust gases includes the steps of collecting PMs, forcibly exhausting PMs, and purifying PMs. In the step of purifying PMs, PMs in exhaust gases are collected with a filter. In the step of forcibly exhausting PMs, PMs, which are collected on the filter, are exhausted by blowing a pressurized gas onto the filter, thereby forming PMs-containing gases. In the step of purifying PMs, PMs, which are contained in the PMs-containing gases, are purified by contacting an oxidizing agent with the PMs-containing gases, thereby removing the PMs from the PMs-containing gases by means of oxidation.

Description

technical field [0001] The present invention relates to a method for purifying exhaust gas containing particulate matter (hereinafter abbreviated as "PMs"), and an apparatus for purifying exhaust gas using the exhaust method. Background technique [0002] For gasoline engines, harmful components in the exhaust have been safely reduced through strict regulations on exhaust and technological advances to cope with the strict regulations. On the other hand, for diesel engines, due to the emission of particulates (or PMs, such as carbon-containing fine particles, sulfur-containing fine particles such as sulfate, and high-molecular hydrocarbon fine particles (hereinafter referred to as "SOFs")) In a unique situation, it is more difficult to purify the exhaust of a diesel engine than that of a gasoline engine. [0003] For diesel engines, exhaust purification devices have been developed, and the following are known. For example, exhaust gas purification devices can be roughly div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D46/24F01N3/023F01N3/05
CPCF01N2240/38B01D46/0058F01N2013/023B01D53/944B01D46/0061B01D2267/40B01D46/0068F01N2510/06F01N3/0842F01N3/0233B01D2279/30F01N3/035F01N13/04F01N3/0814F01N2510/0684B01D46/2418F01N3/2093F01N3/032F01N3/22F01N13/0093F01N13/011B01D46/82B01D46/90B01D46/71B01D53/94B01D46/24F01N3/05F01N3/023
Inventor 铃木重治山崎清榊原雄二
Owner TOYOTA JIDOSHA KK
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