WO2017215459A1 - Appareil de mélange de post-traitement de gaz d'échappement - Google Patents

Appareil de mélange de post-traitement de gaz d'échappement Download PDF

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Publication number
WO2017215459A1
WO2017215459A1 PCT/CN2017/086992 CN2017086992W WO2017215459A1 WO 2017215459 A1 WO2017215459 A1 WO 2017215459A1 CN 2017086992 W CN2017086992 W CN 2017086992W WO 2017215459 A1 WO2017215459 A1 WO 2017215459A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixing
pipe
tube
side wall
exhaust gas
Prior art date
Application number
PCT/CN2017/086992
Other languages
English (en)
Chinese (zh)
Inventor
童毅君
白冰
毛伟
Original Assignee
天纳克（苏州）排放系统有限公司
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 天纳克（苏州）排放系统有限公司 filed Critical 天纳克（苏州）排放系统有限公司
Publication of WO2017215459A1 publication Critical patent/WO2017215459A1/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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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

Definitions

  • the invention relates to an exhaust gas post-treatment mixing device, and belongs to the technical field of engine exhaust gas post-treatment.
  • the uniformity of ammonia distribution in the exhaust gas aftertreatment system (eg, selective catalytic reduction system, SCR system) has an important impact on the overall performance and durability of the system. If the ammonia distribution is uneven, it will lead to excessive ammonia in the local area and easy to cause ammonia leakage, while in other thin ammonia regions, the nitrogen oxide (NOx) conversion efficiency is too low. Uneven distribution of ammonia over a long period of time can result in uneven aging of the catalyst, thereby affecting the overall performance of the catalyst. In addition, the uneven distribution of urea droplets may cause the local tube wall or mixed structure temperature to be too low to form crystallization, which may block the tail gas pipe when severe, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • an exhaust aftertreatment mixing device comprising a housing and a mixing assembly at least partially located within the housing, wherein the mixing assembly comprises a mixing chamber, at least partially extending into the chamber An intake pipe in the mixing chamber and an air outlet pipe extending at least partially into the mixing chamber, the side wall of the air inlet pipe being provided with at least one opening communicating with the mixing chamber, the air outlet pipe comprising an inner tube, and a matching body of the inner tube, an outer tube located at a periphery of the inner tube, and an end cap cooperating with the outer tube, the inner tube being provided with a first tube body and extending in the mixing chamber a second tube body of the mixing chamber, a side wall of the first tube body is provided with a plurality of swirling sheets, and a mixing space is arranged between the second tube body and the outer tube, the second tube
  • the side wall of the body is provided with a plurality of first perforations through which the airflow passes; the distribution body is provided with a plurality
  • the housing is provided to install a urea nozzle to inject urea into the inner tube Mounting seat.
  • the mixing chamber is at least surrounded by a U-shaped side wall, a protruding wall at the top of the outer tube, and a bottom wall connecting the U-shaped side wall and the protruding wall.
  • the bottom wall is provided with a solid portion that blocks the intake pipe and a mounting hole through which the inner tube passes.
  • the bottom wall is provided with a slot at a periphery of the mounting hole, and the slot communicates with the mixing chamber and the mixing space.
  • the first pipe body includes a plurality of openings at an upper portion of the swirling sheet, and the opening holes are adjacent to the mounting seat and communicate with the mixing chamber.
  • the distribution body is fixed at the bottom of the first pipe body.
  • the distribution body has an arc shape.
  • the end cap is provided with a protrusion protruding into the second tube body for forcing a reverse flow of the airflow.
  • the dispensing body is located above the end cap and spaced apart from the end cap in a vertical direction.
  • the air intake pipe and the air outlet pipe are arranged side by side and parallel, the air intake pipe and the air outlet pipe are both perpendicular to the casing, and both sides of the mixing cavity are arcs. shape.
  • the present invention improves the mixing uniformity of the exhaust gas and the urea droplet by providing the swirling sheet; by setting the distribution body, the urea droplet is broken smaller, and the atomization and mixing effect of the urea is improved; In addition, by providing the inner tube and the outer tube, and forcing the flow of the gas to flow backward through the end cap, the distance and time of evaporation of the urea are increased, and the uniformity of the airflow mixing is improved.
  • Figure 1 is a schematic perspective view of a tail gas aftertreatment mixing device of the present invention.
  • Figure 2 is a perspective view of another angle of Figure 1.
  • Figure 3 is a left side view of Figure 2.
  • Figure 4 is a cross-sectional view taken along line A-A of Figure 3.
  • Figure 5 is a perspective exploded view of Figure 1.
  • the present invention discloses an exhaust aftertreatment mixing device 100 for use in an aftertreatment system such as an SCR to treat engine exhaust.
  • the exhaust aftertreatment mixing device 100 includes a housing 1 and a mixing assembly 2 at least partially mounted within the housing 1.
  • the casing 1 has a cylindrical shape, and is provided with a mounting portion 11 that protrudes from the casing 1 and a mounting seat 12 that is welded to the mounting portion 11.
  • the mount 12 is used to mount a urea nozzle (not shown) to inject urea into the mixing assembly 2.
  • the mixing assembly 2 includes a mixing chamber 21, an intake tube 22 that extends at least partially into the mixing chamber 21, and an outlet tube 23 that extends at least partially into the mixing chamber 21.
  • the intake pipe 22 passes through the mounting portion 11.
  • the intake pipe 22 is disposed side by side and parallel to the air outlet pipe 23, and the intake pipe 22 and the air outlet pipe 23 are both perpendicular to the casing 1.
  • the side wall of the intake pipe 22 is provided with at least one opening 221 that communicates with the mixing chamber 21. Referring to FIG. 4 and FIG. 5, in the illustrated embodiment of the present invention, the openings 221 are several and are circular.
  • the air outlet tube 23 includes an inner tube 24, a distribution body 25 that cooperates with the inner tube 24, an outer tube 26 that is located at the periphery of the inner tube 24, and an end cap 27 that mates with the outer tube 26.
  • the mixing chamber 21 is at least a U-shaped sidewall 211, a protruding wall 261 at the top of the outer tube 26, and the U-shaped sidewall 211 and the protruding wall.
  • the bottom wall 212 of the 261 and the mounting portion 11 are enclosed. In the illustrated embodiment of the invention, both sides of the mixing chamber 21 are curved.
  • the bottom wall 212 is provided with a solid portion 2121 that blocks the intake pipe 22 and a mounting hole 2122 through which the inner tube 24 passes. The bottom end of the intake pipe 22 abuts against the solid portion 2121.
  • the inner tube 24 is provided with a first tube body 241 located in the mixing chamber 21 and a second tube body 242 extending out of the mixing chamber 21.
  • the first tube body 241 is substantially in the shape of a truncated cone, and a side wall thereof is provided with a plurality of swirling sheets 2411 and a plurality of openings 2412 at an upper portion of the swirling sheet 2411.
  • the opening 2412 is adjacent to the mount 12 and is in communication with the mixing chamber 21.
  • a mixing space 28 is disposed between the second pipe body 242 and the outer pipe 26, and a sidewall of the second pipe body 242 is provided with a plurality of first through holes 2421 through which airflow passes.
  • the distribution body 25 is provided with a plurality of through holes 251 through which the airflow passes.
  • the outer tube 26 is located at the periphery of the second tube body 242, and the wall surface of the outer tube 26 is provided with a plurality of second perforations 262 for airflow.
  • the end cap 27 is located at the bottom of the outer tube 26 to force the flow of gas to flow in the opposite direction.
  • the dispensing body 25 is fixed to the bottom of the first tubular body 241.
  • the distribution body 25 has an arc shape.
  • the end cap 27 is provided with a projection 271 that projects into the second tubular body 242 and forces the airflow to flow in the opposite direction.
  • the dispensing body 25 is located above the end cap 27 and is spaced apart from the end cap 27 in a vertical direction.
  • the bottom wall 212 is provided with a slot 2123 at the periphery of the mounting hole 2122.
  • the slot 2123 communicates with the mixing chamber 21 and the mixing space 28 to reduce back pressure.
  • the exhaust gas of the engine enters from the intake pipe 22, the exhaust gas enters the mixing chamber 21 through the opening 221, and then most of the exhaust gas is rotated into the inner pipe 24 under the guidance of the swirling plate 2411, and a small amount of exhaust gas is self-opening. 2412 enters inner tube 24.
  • the urea nozzle injects urea into the mixing assembly 2, and the atomized urea droplets are mixed with the exhaust gas of the engine and rotated downward.
  • the plurality of through holes 251 of the distribution body 25 can on the one hand break the urea hitting it into smaller droplets, thereby improving the atomization and mixing effect of the urea; on the other hand, the airflow can be passed through, thereby reducing Back pressure.
  • the flow of gas is forced to reverse (e.g., upward) under the action of the end cap 27.
  • the airflow after the reverse passes through the first perforations 2421 and/or the second perforations 262 to a carrier (eg, an SCR, not shown) located downstream.
  • a carrier eg, an SCR, not shown

Landscapes

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

Abstract

Cet appareil de mélange de post-traitement de gaz d'échappement, comprend une enveloppe et un ensemble mélangeur. L'ensemble mélangeur comprend une cavité de mélange, un tuyau d'admission de gaz, et un tuyau de sortie de gaz. La paroi latérale du tuyau d'admission de gaz est pourvue d'au moins une ouverture en communication avec la cavité de mélange. Le tuyau de sortie de gaz comprend un tuyau interne, un distributeur, un tuyau externe et un couvercle d'extrémité. Le tuyau interne est pourvu d'un premier corps de tuyau positionné à l'intérieur de la cavité de mélange et d'un second corps de tuyau s'étendant à l'extérieur de la cavité de mélange. La paroi latérale du premier corps de tuyau est pourvue d'une pluralité de plaques d'écoulement rotatives. Un espace de mélange est disposé entre le second corps de tuyau et le tuyau externe. La paroi latérale du second corps de tuyau est pourvue d'une pluralité de premières perforations à travers lesquelles passe le flux de gaz. Le distributeur est pourvu d'une pluralité de trous traversants à travers lesquels passe le flux de gaz. La paroi latérale du tuyau externe est pourvue d'une pluralité de secondes perforations à travers lesquelles passe le flux de gaz. Le couvercle d'extrémité est positionné au fond du tuyau externe et est utilisé pour forcer le flux de gaz à s'écouler dans la direction inverse. La présente invention augmente la distance et le temps d'évaporation de l'urée, et améliore l'uniformité du mélange du flux gazeux.
PCT/CN2017/086992 2016-06-13 2017-06-02 Appareil de mélange de post-traitement de gaz d'échappement WO2017215459A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610415941.0A CN107489501A (zh) 2016-06-13 2016-06-13 尾气后处理混合装置
CN201610415941.0 2016-06-13

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Publication Number Publication Date
WO2017215459A1 true WO2017215459A1 (fr) 2017-12-21

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WO (1) WO2017215459A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100029141A1 (it) * 2021-11-17 2023-05-17 Fpt Ind Spa Miscelatore per sistema di post-trattamento di gas di scarico veicolari e sistema di post-trattamento comprendente tale miscelatore

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CN110836136A (zh) * 2019-07-30 2020-02-25 万向通达股份公司 车辆后处理器及其旋叶管

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DE102009036511A1 (de) * 2009-08-07 2011-02-10 Friedrich Boysen Gmbh & Co. Kg Abgasanlage
US20120124968A1 (en) * 2010-11-24 2012-05-24 Cnh America Llc Mixing pipe for scr mufflers
CN103321724A (zh) * 2013-07-09 2013-09-25 潍柴动力股份有限公司 Scr催化消声器及其混合管装置
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WO2016044086A1 (fr) * 2014-09-15 2016-03-24 Tenneco Automotive Operating Company Inc. Ensemble de mélange d'échappement
CN205714371U (zh) * 2016-06-13 2016-11-23 天纳克（苏州）排放系统有限公司 尾气后处理混合装置

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DE102010014037A1 (de) * 2009-04-02 2010-11-04 Cummins Filtration IP, Inc., Minneapolis Reduktionsmittelzersetzungssystem
US9352276B2 (en) * 2013-05-07 2016-05-31 Tenneco Automotive Operating Company Inc. Exhaust mixing device
CN105089750B (zh) * 2015-08-21 2018-04-06 天纳克（苏州）排放系统有限公司 排气处理装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009036511A1 (de) * 2009-08-07 2011-02-10 Friedrich Boysen Gmbh & Co. Kg Abgasanlage
US20120124968A1 (en) * 2010-11-24 2012-05-24 Cnh America Llc Mixing pipe for scr mufflers
CN103321724A (zh) * 2013-07-09 2013-09-25 潍柴动力股份有限公司 Scr催化消声器及其混合管装置
WO2016044086A1 (fr) * 2014-09-15 2016-03-24 Tenneco Automotive Operating Company Inc. Ensemble de mélange d'échappement
CN104832256A (zh) * 2015-05-13 2015-08-12 天纳克（苏州）排放系统有限公司 双层混合管及其排气处理装置
CN205714371U (zh) * 2016-06-13 2016-11-23 天纳克（苏州）排放系统有限公司 尾气后处理混合装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100029141A1 (it) * 2021-11-17 2023-05-17 Fpt Ind Spa Miscelatore per sistema di post-trattamento di gas di scarico veicolari e sistema di post-trattamento comprendente tale miscelatore
EP4183988A1 (fr) * 2021-11-17 2023-05-24 FPT Industrial S.p.A. Mélangeur pour un système de post-traitement des gaz d'échappement de véhicule et système de post-traitement comprenant un tel mélangeur

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