Exhaust gas purification apparatus and method for increasing corrosion resistance of exhaust gas purification apparatus
a technology of exhaust gas purification and corrosion resistance, which is applied in the direction of mechanical equipment, machines/engines, manufacturing tools, etc., can solve the problems that the corrosion of the outer pipe, particularly the welded portion thereof, may occur not only by the biuret, and the occurrence of corrosion can be reduced
Inactive Publication Date: 2014-09-18
NISSAN DIESEL MOTOR CO
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Benefits of technology
The present invention provides an exhaust gas purification apparatus with an improved corrosion resistance of the outer pipe. By fine-tuning the grain boundaries of the welded portion on the inner peripheral surface of the outer pipe, a better atomic arrangement can be achieved, which in turn improves corrosion resistance and reduces the occurrence of corrosion. The method for increasing the corrosion resistance of the exhaust gas purification apparatus is also provided.
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[0017]Hereinbelow, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
[0018]FIGS. 1 to 3 illustrate an example of an exhaust gas purification apparatus.
[0019]The exhaust gas purification apparatus includes a first casing 10 having a tubular shape, a second casing 20, which also has a tubular shape, and a communication pipe 30 by which far-end portions of the first casing 10 and the second casing 20 communicate with each other. The first casing 10 and the second casing 20 are arranged to be close to each other in a manner such that an axis 10A thereof and an axis 20A thereof are arranged to be substantially parallel to each other (as used herein, “parallel” may be confirmed by measuring with the eye). In addition, the communication pipe 30 is also arranged in a manner such that an axis 30A thereof is substantially parallel to the axis 10A of the first casing 10 and the axis 20A of the second casing 20. Here, the first casi...
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Abstract
An exhaust gas purification apparatus includes a SCR converter selectively reducing and purifying NOx in exhaust gas upon being supplied with ammonia generated from urea aqueous solution and an injection nozzle injection-supplying the urea aqueous solution on exhaust gas upstream side of the SCR converter. At least a part of an exhaust pipe located between the injection nozzle and the SCR converter has a double-pipe structure including inner and outer pipes, each having a welded portion, and the welded portion of the outer pipe was welded from an inside of the outer pipe. Thus, the outer pipe has fine welded portion on an inner peripheral surface where a welding temperature is high and the coarse welded portion on an outer peripheral surface where the welding temperature is low, resulting in an ordered atomic arrangement and thus improved corrosion resistance of the inner peripheral surface, which may be exposed to ammonia.
Description
[0001]This application is a continuation application of PCT / JP2012 / 078937, filed on Nov. 8, 2012.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an exhaust gas purification apparatus that selectively reduces and purifies nitrogen oxide (NOx) contained in exhaust gas of an engine and relates to a method for increasing corrosion resistance of the exhaust gas purification apparatus.[0004]2. Description of Related Art[0005]As a catalytic purification system for removing NOx contained in exhaust gas of an engine, an exhaust gas purification apparatus disclosed in Japanese Laid-open Patent Application Publication No. 2005-226528 has been proposed. Such an exhaust gas purification apparatus supplies by injection a liquid reducing agent or a precursor thereof according to an engine operation state on the exhaust gas upstream side of a selective catalytic reduction (SCR) converter, which is disposed in an exhaust pipe, to thereby selectively c...
Claims
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IPC IPC(8): F01N3/20
CPCF01N3/20B23K9/167F01N3/2066F01N13/141F01N2450/22F01N2530/02F01N2610/02B23K9/0253B23K9/0284F01N13/08F01N13/16Y02T10/12
Inventor SUGIYAMA, SATOSHI
Owner NISSAN DIESEL MOTOR CO