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Exhaust gas purification apparatus

A technology for exhaust gas purification and equipment, which is applied to mechanical equipment, exhaust devices, catalyst carriers, etc., and can solve the problems of electric heater cut-off and short circuit.

Inactive Publication Date: 2010-08-18
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, according to the system of the above-mentioned document, the electric heater may be cut off due to a broken wire, which may be due to overheating of the heater during operation when the exhaust gas flow is low, or due to particulate matter (PM) adhering to the heating element short circuit caused by

Method used

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Embodiment Construction

[0013] The following will refer to Figure 1 to Figure 4 Preferred embodiments of the exhaust gas purification device according to the present invention are described. see first figure 1 , which shows a schematic structural diagram of an exhaust gas purification device according to a preferred embodiment of the present invention. Exhaust gas from the diesel engine 1 flows through an exhaust pipe 2 . An oxidation catalyst 3 , a diesel particulate filter (hereinafter referred to as DPF) 4 , an SCR catalyst 5 and another oxidation catalyst 6 are arranged in this order in the exhaust gas pipe 2 . A nozzle 7 for injecting urea water is provided between the DPF 4 and the SCR catalyst 5 , and the nozzle 7 is connected to a urea water tank 7 for storing urea water through a pipe 8 . A urea water supply device 10 is provided in the pipeline 8, and the urea water supply device 10 is used to supply the urea water in the urea water tank 9 to the nozzle 7, and is also electrically conne...

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Abstract

An exhaust gas purification apparatus includes a catalyst carrier which has a body and a catalyst supported on the body, and an electrically conducting device for conducting an electric current to the body. A part of the body is at least made of a conductive nonmetal.

Description

Background technique [0001] The present invention relates to an exhaust gas purification device, and more particularly to an exhaust gas purification device for increasing the temperature of a catalyst forming part of the device. [0002] A urea selective catalytic reduction technology (hereinafter abbreviated as SCR) for reducing nitrogen oxide (NOx) content in exhaust gas of a diesel engine has been developed. The SCR includes: an oxidation catalyst, which is used to oxidize nitrogen monoxide (NO) to nitrogen dioxide (NO2); an SCR catalyst, which is arranged downstream of the oxidation catalyst, and which is used to convert NOx to Nitrogen and H2O, wherein ammonia is produced by reacting urea with H2O; a urea supply device for supplying urea to the SCR catalyst; and an oxidation catalyst disposed downstream of the SCR catalyst for oxidizing the above residual ammonia after the chemical reaction. [0003] When the temperature is higher than a certain level, the oxidation ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20
CPCF01N2330/06F01N3/2026Y02T10/26F01N3/28F01N3/2828Y02T10/12
Inventor 吉田浩二
Owner TOYOTA IND CORP