WO2013084653A1 - Dispositif d'épuration des gaz d'échappement et procédé destiné à augmenter la résistance à la corrosion d'un dispositif d'épuration des gaz d'échappement - Google Patents

Dispositif d'épuration des gaz d'échappement et procédé destiné à augmenter la résistance à la corrosion d'un dispositif d'épuration des gaz d'échappement Download PDF

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Publication number
WO2013084653A1
WO2013084653A1 PCT/JP2012/078938 JP2012078938W WO2013084653A1 WO 2013084653 A1 WO2013084653 A1 WO 2013084653A1 JP 2012078938 W JP2012078938 W JP 2012078938W WO 2013084653 A1 WO2013084653 A1 WO 2013084653A1
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WO
WIPO (PCT)
Prior art keywords
exhaust
pipe
control device
emission control
converter
Prior art date
Application number
PCT/JP2012/078938
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English (en)
Japanese (ja)
Inventor
敏 杉山
Original Assignee
Ｕｄトラックス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｕｄトラックス株式会社 filed Critical Ｕｄトラックス株式会社
Publication of WO2013084653A1 publication Critical patent/WO2013084653A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/103—Oxidation catalysts for HC and CO only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/02—Corrosion resistive metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an exhaust purification device and a method for improving corrosion resistance of an exhaust purification device that selectively reduce and purify nitrogen oxides (NOx) in engine exhaust.
  • NOx nitrogen oxides
  • Patent Document 1 An exhaust purification device described in Japanese Patent Application Laid-Open No. 2005-226528 (Patent Document 1) has been proposed as a catalyst purification system for removing NOx in engine exhaust.
  • Such an exhaust purification device injects and supplies a liquid reducing agent or a precursor thereof according to the engine operating state to the exhaust upstream of an SCR (Selective Catalytic Reduction) converter disposed in an exhaust pipe.
  • a reduction agent is selectively reduced to reduce NOx into harmless components.
  • the exhaust pipe into which the liquid reducing agent or its precursor is injected and supplied includes an inner pipe and an outer pipe in order to suppress the liquid reducing agent or its precursor from being cooled and deposited. Double pipe structure is adopted.
  • a urea aqueous solution having excellent safety and handling property may be used as a precursor of a liquid reducing agent.
  • the exhaust gas mixed with the urea aqueous solution passes not only between the inner tube and the outer tube but also between the inner tube and the outer tube. Since the outer peripheral surface of the outer tube is in contact with the outside air, the temperature is likely to be lower than that of the inner tube.
  • the temperature of the outer tube becomes less than about 200 ° C. according to the engine operating condition, etc.
  • the urea aqueous solution droplets adhering to the inner peripheral surface of the outer tube generate biuret while generating ammonia. It will be deposited on the inner peripheral surface of.
  • the biuret deposited on the inner peripheral surface of the outer tube generates cyanuric acid and ammonia when the exhaust gas temperature rises as the engine operating state changes.
  • Ammonia is corrosive to metals, and therefore, when its concentration is locally high, there is a risk of corroding the outer tube, particularly the welded portion applied thereto.
  • the corrosion of the outer tube is not limited to biuret, and may occur in other precipitates derived from urea.
  • an object of the present invention is to provide an exhaust purification device and a method for improving the corrosion resistance of the exhaust purification device, in which the corrosion resistance of the outer tube is improved.
  • the exhaust purification device is disposed in the exhaust pipe of the engine, receives the supply of ammonia generated from the urea aqueous solution, selectively reduces and purifies NOx in the exhaust, and injects the urea aqueous solution upstream of the SCR converter exhaust And an injection nozzle to be supplied.
  • at least a part of the exhaust pipe located between the injection nozzle and the SCR converter has a double pipe structure consisting of an inner pipe and an outer pipe, and at least of both ends of the inner pipe and the outer pipe. End portions located at the exhaust upstream end portion are welded to each other over the entire circumference.
  • FIG. 1 to 3 show an example of an exhaust emission control device.
  • the exhaust purification device communicates the first casing 10 having a cylindrical shape, the second casing 20 having the same cylindrical shape, and the far ends of the first casing 10 and the second casing 20 with each other.
  • the first casing 10 and the second casing 20 are arranged in close proximity to each other so that the axis 10A and the axis 20A are substantially parallel (appears to be parallel in appearance. The same applies hereinafter). .
  • the communication pipe 30 is also piped such that its axis 30A is substantially parallel to the axis 10A of the first casing 10 and the axis 20A of the second casing 20.
  • casing 20, and the communicating pipe 30 correspond to some exhaust pipes of an engine.
  • the first casing 10 has an inlet 12 at the exhaust upstream end and an outlet 14 at the exhaust downstream end.
  • the inlet 12 is formed at the end face of the exhaust upstream end
  • the outlet 14 is formed at the side of the exhaust downstream end.
  • a DOC (Diesel Oxidation Catalyst) converter 16 that oxidizes at least NO (nitrogen monoxide) to NO 2 (nitrogen dioxide) and a PM (Particulate Matter) are captured.
  • a diesel particulate filter (Diesel Particulate Filter, hereinafter referred to as “DPF”) 18 to be collected and removed is housed with the DOC converter 16 on the exhaust upstream side.
  • DPF diesel particulate filter
  • the second casing 20 has an inlet 22 at the exhaust upstream end and an outlet 24 at the exhaust downstream end.
  • both the inflow port 22 and the discharge port 24 are formed on the end side surface.
  • an SCR converter 26 that selectively reduces and purifies NOx using ammonia as a reducing agent
  • an oxidation catalyst converter 28 that oxidizes the ammonia that has passed through the SCR converter 26. 26 is stored with the exhaust upstream side.
  • the communication pipe 30 is the exhaust downstream downstream end of the first casing 10, which is the far ends of the first casing 10 and the second casing 20, in other words, the far ends positioned on opposite sides of each other.
  • the inflow port 22 at the exhaust upstream end of the second housing 20 are in communication with each other. Therefore, engine exhaust flows into the first housing 10 from the inlet 12, passes through the DOC converter 16 and the DPF 18, and enters the communication pipe 30 from the outlet 14. Then, the exhaust gas flows into the second housing 20 from the inlet 22 through the communication pipe 30, passes through the SCR converter 26 and the oxidation catalyst converter 28, and is discharged from the outlet 24. That is, the exhaust passage extending from the first housing 10 to the second housing 20 via the communication pipe 30 is folded once by the communication pipe 30.
  • the communication pipe 30 is a straight straight pipe having bent portions formed at both ends for connection between the outlet 14 of the first casing 10 and the inlet 22 of the second casing 20.
  • An injection nozzle 32 is attached to a bent portion with respect to the outlet 14, and an aqueous urea solution is injected and supplied into a straight pipe. Thereby, the linear length required for the uniform diffusion of the urea aqueous solution into the exhaust gas is secured.
  • a mesh-like diffusion member may be installed in the communication pipe 30.
  • the silhouette has a compact size similar to a square muffler. Further, since the far ends of the first casing 10 and the second casing 20 are communicated with each other by the communication pipe 30, the first casing 10 and the first casing 10 and the second casing 20 are secured while ensuring the tube length necessary for uniform diffusion of the urea aqueous solution.
  • the communication pipe 30 can be accommodated in the silhouette of the second casing 20, and the size in the length direction from the upstream side of the exhaust to the downstream side has been successfully reduced.
  • Both ends of the straight portion sandwiched between the bent portions of the communication pipe 30 are detachably fastened to the bent portions via flanges 34 as shown in FIGS.
  • a straight portion that can be attached and detached by the flange 34 in other words, at least a part of the exhaust pipe positioned between the injection nozzle 32 and the SCR converter 26 improves the heat retaining property of the communication pipe 30, and is supplied by injection from the injection nozzle 32, for example.
  • a double tube structure comprising an inner tube 36 and an outer tube 38 arranged concentrically is formed.
  • the inner pipe 36 and the outer pipe 38 have a stepped shape in which the exhaust upstream end has a large diameter while the exhaust downstream end has a small diameter.
  • both ends of the outer pipe 38 are, for example, a tungsten-inert gas (TIG; Tungsten Inert Gas) that provides a high-quality and beautiful weld bead (weld trace) so that the exhaust gas flowing through the communication pipe 30 does not leak to the outside.
  • TOG Tungsten Inert Gas
  • All the circumferences of the annular flanges 34 are welded to each other by welding.
  • both ends of the inner tube 36 are formed by, for example, TIG welding so that a sealed space is formed by the outer peripheral surface of the inner tube 36, the inner peripheral surface of the outer tube 38, and one surface of the flange 34. The entire surface is welded.
  • the straight portion of the communication pipe 30 is a sealed space between the inner pipe 36 and the outer pipe 38, the exhaust gas mixed with the urea aqueous solution is improved in heat retention while the inner pipe 36 and the outer pipe 38 are mixed. Will not be introduced between. For this reason, precipitates derived from urea such as biuret are hardly deposited on the inner peripheral surface of the outer tube 38, and the absolute amount of ammonia generated from the precipitates is reduced even when the exhaust temperature rises. 38 corrosion can be suppressed.
  • both ends of the inner pipe 36 are welded to the inner peripheral surface of the flange 34, the welding operation is easily performed from the side, and the number of welding steps can be reduced.
  • the end of the inner pipe 36 and the end of the outer pipe 38 are connected via the flange 34. What is necessary is just to weld each other over the perimeter. Further, the inner pipe 36 and the outer pipe 38 may be directly welded at the end portions without the flange 34 interposed therebetween. Further, when the straight portion of the communication path 30 is integrated with the bent portion (cannot be attached / detached) and the inner tube 36 is fixed to the outer tube 38 by a known means, for example, the inner tube What is necessary is just to expand the diameter of the edge part of 36 and to weld the front-end
  • the exhaust purification device includes a first housing 10 in which the DOC converter 16 and the DPF 18 are housed, and a second housing 20 in which the SCR converter 26 and the oxidation catalyst converter 28 are housed. It may be arranged in a straight line. Further, the exhaust purification device only needs to have at least the SCR converter 26.
  • the welding method is not limited to TIG welding, but may be arc welding such as MIG (Metal Inert ⁇ Gas) welding, MAG (Metal Active Gas) welding, or the like.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

L'invention se rapporte à un dispositif d'épuration des gaz d'échappement comportant : un convertisseur à SCR qui reçoit un apport en ammoniac provenant d'une solution aqueuse d'urée et qui réduit/élimine de manière sélective les NOx dans les gaz d'échappement ; et une buse d'injection qui apporte/injecte ladite solution aqueuse d'urée en amont de l'échappement dudit convertisseur à SCR. De plus, une partie au moins du tube d'échappement placé entre la buse d'injection et le convertisseur à SCR possède une structure de tube à paroi double qui comporte un tube externe et un tube interne, et, parmi les deux extrémités du tube interne et du tube externe, au moins celles qui sont placées à l'extrémité de l'échappement se trouvant en amont sont soudées l'une à l'autre sur toute la circonférence, un bord se trouvant entre elles. En outre, les gaz d'échappement auxquels la solution aqueuse d'urée a été ajoutée ne passent pas entre le tube interne et le tube externe, et puisque les dépôts provenant de l'urée n'atteignent presque pas la surface périphérique interne du tube externe, il n'y a pas de corrosion sur le tube externe.
PCT/JP2012/078938 2011-12-06 2012-11-08 Dispositif d'épuration des gaz d'échappement et procédé destiné à augmenter la résistance à la corrosion d'un dispositif d'épuration des gaz d'échappement WO2013084653A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011266473A JP2013119773A (ja) 2011-12-06 2011-12-06 排気浄化装置
JP2011-266473 2011-12-06

Publications (1)

Publication Number Publication Date
WO2013084653A1 true WO2013084653A1 (fr) 2013-06-13

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WO (1) WO2013084653A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109538343A (zh) * 2018-11-27 2019-03-29 中航通飞华南飞机工业有限公司 一种双层结构的飞机发动机排气管及其焊接制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016223311A (ja) * 2015-05-28 2016-12-28 日野自動車株式会社 排気浄化装置の接続構造及び方法
CN114738084A (zh) * 2021-01-07 2022-07-12 长城汽车股份有限公司 汽车后处理系统及汽车

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003184548A (ja) * 2001-12-21 2003-07-03 Nissan Motor Co Ltd 排気二重管
JP2005226528A (ja) * 2004-02-12 2005-08-25 Tokyo Roki Co Ltd Ｓｃｒマフラー
JP2011196311A (ja) * 2010-03-23 2011-10-06 Mazda Motor Corp 排気浄化方法及び排気浄化装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003184548A (ja) * 2001-12-21 2003-07-03 Nissan Motor Co Ltd 排気二重管
JP2005226528A (ja) * 2004-02-12 2005-08-25 Tokyo Roki Co Ltd Ｓｃｒマフラー
JP2011196311A (ja) * 2010-03-23 2011-10-06 Mazda Motor Corp 排気浄化方法及び排気浄化装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109538343A (zh) * 2018-11-27 2019-03-29 中航通飞华南飞机工业有限公司 一种双层结构的飞机发动机排气管及其焊接制造方法

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