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WO2018095141A1 - Dispositif de post-traitement des gaz d'échappement - Google Patents

Dispositif de post-traitement des gaz d'échappement Download PDF

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Publication number
WO2018095141A1
WO2018095141A1 PCT/CN2017/104328 CN2017104328W WO2018095141A1 WO 2018095141 A1 WO2018095141 A1 WO 2018095141A1 CN 2017104328 W CN2017104328 W CN 2017104328W WO 2018095141 A1 WO2018095141 A1 WO 2018095141A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
exhaust aftertreatment
cavity
aftertreatment device
housing
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2017/104328
Other languages
English (en)
Chinese (zh)
Inventor
吴健
严俊
郑祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenneco Suzhou Emission System Co Ltd
Original Assignee
Tenneco Suzhou Emission System Co Ltd
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 Tenneco Suzhou Emission System Co Ltd filed Critical Tenneco Suzhou Emission System Co Ltd
Publication of WO2018095141A1 publication Critical patent/WO2018095141A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • 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 invention relates to an exhaust gas aftertreatment device, and belongs to the technical field of engine exhaust aftertreatment.
  • the uniformity of ammonia distribution in the exhaust 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 exhaust pipe when severe, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • an exhaust aftertreatment device comprising a housing, a mixing chamber located in the housing, and a mixing device at least partially located in the mixing chamber, wherein
  • the housing is provided with an inlet tube, an outlet tube and a first side for mounting a urea nozzle, the mixing chamber including a side plate opposite the first side and between the first side and the side plate a partition separating the mixing chamber into a first cavity and a second cavity;
  • the mixing device comprising a distribution plate located in the first cavity and facing the inlet pipe, located a swirl tube inside the first cavity and located downstream of the distribution plate; and a flow guide cover fixed to the side plate and facing the swirl tube;
  • the distribution plate has an arc shape, and is disposed thereon Having a plurality of dispensing orifices;
  • the urea nozzle for injecting atomized urea droplets into the swirl tube, the swirling tube being provided with a plurality of swirling fins in the first cavity, the swirling tube Er
  • the mixing chamber is further provided with a top plate and a bottom plate, wherein the partition plate and the side plate are both welded on the top plate and the bottom plate, and the distribution plate is upwardly raised The shape is welded to the bottom plate.
  • the left and right sides of the distribution plate are respectively welded to the first side and the partition.
  • the length of the bottom plate is greater than the length of the top plate.
  • the shroud is spaced apart from the swirl tube by a distance, and the shroud protrudes rearward from the side plate.
  • the side plates are provided with a plurality of openings through which a mixture of exhaust gas and urea droplets of the engine passes.
  • the separator is a non-porous separator.
  • the inlet pipe is located at a bottom end of the casing
  • the outlet pipe is located at a top end of the casing
  • the exhaust aftertreatment device is further disposed within the casing.
  • the housing includes two first and second housings each having a U shape, wherein the first housing and the second housing are welded together.
  • the present invention increases the distance and time of urea evaporation by providing a distribution plate, a swirling tube and a shroud, and improves the uniformity of airflow mixing.
  • Figure 1 is a perspective view of an exhaust aftertreatment device of the present invention.
  • Figure 2 is a perspective view of another angle of Figure 1.
  • Fig. 3 is an exploded perspective view of Fig. 1;
  • Figure 4 is an exploded perspective view of another angle of Figure 3.
  • Figure 5 is an exploded perspective view of the top plate, the bottom plate, the partition plate, the distribution plate, the swirl tube, and the like of Figure 4;
  • Figure 6 is an exploded perspective view of the second housing, side panels, and shroud of Figure 4.
  • Figure 7 is a cross-sectional view taken along line A-A of Figure 1.
  • the present invention discloses an exhaust aftertreatment device 100 for treating exhaust gases of an engine (e.g., a high power engine).
  • the exhaust aftertreatment device 100 comprises a housing 1 , a mixing chamber 2 located within the housing 1 , and a mixing device 3 at least partially located within the mixing chamber 2 and at the mixing device 3 The downstream of the selective catalytic reduction agent 4.
  • the housing 1 is provided with an inlet tube 11 and an outlet tube 12.
  • the inlet tube 11 is located at the bottom end of the housing 1 and the outlet tube 12 is located at the top end of the housing 1.
  • the housing 1 includes two first housings 13 and a second housing 14 each having a U shape, wherein the first housing 13 and the second housing 14 are welded together.
  • the first housing 13 and the second housing 14 are both double-layered structures.
  • the first housing 13 is provided with a first side 131 for mounting a urea nozzle (not shown).
  • the mixing chamber 2 includes a top plate 21, a bottom plate 22, a side plate 23 opposite to the first side surface 131, and a partition plate 24 between the first side surface 131 and the side plate 23.
  • the partition plate 24 and the side plate 23 are welded to the top plate 21 and the bottom plate 22. Referring to FIG. 7, the partition 24 partitions the mixing chamber into a first cavity 25 and a second cavity 26.
  • the length of the bottom plate 22 is greater than the length of the top plate 21.
  • the mixing device 3 comprises a distribution plate 31 located in the first cavity 25 and facing the inlet tube 11, a swirl tube 32 located in the first cavity 25 and downstream of the distribution plate 31. And a shroud 33 fixed to the side plate 23 and facing the swirl tube 32.
  • the distribution plate 31 has an arc shape and is provided with a plurality of distribution holes 311 therein.
  • the distribution plate 31 has an upwardly convex shape and is welded to the bottom plate 22. In the illustrated embodiment of the present invention, the left and right sides of the distribution plate 31 are welded to the first side surface 131 and the partition plate 24, respectively.
  • the partition 24 is a non-porous partition, that is, the partition 24 is not provided with any holes connecting the first cavity 25 and the second cavity 26.
  • the urea nozzle is configured to spray atomized urea droplets into the swirl tube 32, and the swirl tube 32 is provided with a plurality of swirl fins 321 located in the first cavity 25, so that the engine row Gas can enter the swirl tube 32 in a spiral manner.
  • the swirl tube 32 is mounted on the first side 131 and the partition 24 and passes through the partition 24 to extend into the second cavity 26.
  • the shroud 33 is provided with an opening 331 facing the swirl tube 32 and an arcuate inner surface 332 for changing the flow direction of the air flow.
  • the shroud 33 is spaced apart from the swirl tube 32 by a distance, and the shroud 33 projects rearwardly from the side plate 23.
  • the side plates 23 are provided with a plurality of openings 231 through which a mixture of exhaust gas and urea droplets of the engine passes.
  • the shroud 33 is also a two-layer structure in the illustrated embodiment of the invention.
  • the selective catalytic reducing agent 4 is two groups in the illustrated embodiment of the invention and is located downstream of the side panel 23.
  • the exhaust of the engine enters the inlet pipe 11 and distributes the exhaust gas entering the first cavity 25 under the action of the distribution plate 31; subsequently, the exhaust gas forms a spiral flow under the guidance of the swirling plate 321 And entering the swirl tube 32; when the injection condition is reached, the urea nozzle injects the atomized urea solution into the swirl tube 32, and the urea droplet is mixed with the exhaust gas under the action of the spiral air flow.
  • the gas stream from the swirl tube 32 enters the second chamber 26, and a portion of the mixture of exhaust gas and urea droplets will rush into the flow hood 33 and then reverse under the action of the inner surface 332;
  • the mixture with the urea droplets passes through the opening 231 and eventually exits the outlet tube 12 after passing through the selective catalytic reducing agent 4.
  • the mixing chamber 2 and the mixing device 3 of the present invention increase the distance and time of urea evaporation on the one hand, improve the uniformity of airflow mixing, and reduce the risk of crystallization due to contact of the urea solution with the tube wall.

Landscapes

  • 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)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un dispositif de post-traitement des gaz d'échappement (100), comprenant un boîtier (1), une cavité de mélange (2), et un dispositif de mélange (3). Le boîtier (1) est pourvu d'un tuyau d'entrée (11), d'un tuyau de sortie (12), et d'une première surface latérale (131) sur laquelle est montée une buse d'urée. La cavité de mélange (2) comprend une plaque latérale (23) et un séparateur (24). Le séparateur (24) sépare la cavité de mélange (2) en une première cavité (25) et une seconde cavité (26). Le dispositif de mélange (3) comprend une plaque de distribution (31) faisant face au tuyau d'entrée (11), un tuyau de turbulence (32) situé en aval par rapport à la plaque de distribution (31), et un couvercle de guidage d'écoulement (33) faisant face au tuyau de turbulence (32). La plaque de distribution (31) est en forme d'arc, et comporte une pluralité de trous de distribution (311). Le tuyau de turbulence (32) est pourvue d'une pluralité de plaques de turbulence (321) situées à l'intérieur de la première cavité (25). Le couvercle de guidage d'écoulement (33) est pourvu d'une ouverture (331) faisant face au tuyau de turbulence (32), et d'une surface interne en forme d'arc (332) pour changer la direction d'écoulement d'un flux de gaz. Le dispositif de post-traitement d'échappement de la présente invention augmente la distance et le temps pour l'évaporation de l'urée, améliorant l'uniformité de mélange de flux de gaz, et la réduction du risque de cristallisation provoquée par le contact entre une solution d'urée et une paroi de tuyau.
PCT/CN2017/104328 2016-11-25 2017-09-29 Dispositif de post-traitement des gaz d'échappement Ceased WO2018095141A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201621279927.4U CN206267925U (zh) 2016-11-25 2016-11-25 排气后处理装置
CN201621279927.4 2016-11-25

Publications (1)

Publication Number Publication Date
WO2018095141A1 true WO2018095141A1 (fr) 2018-05-31

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CN (1) CN206267925U (fr)
WO (1) WO2018095141A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110439658A (zh) * 2019-08-12 2019-11-12 郑州精益达环保科技有限公司 一种国六scr前端尿素混合结构
CN111878197A (zh) * 2020-03-05 2020-11-03 广西玉柴机器股份有限公司 一种scr高效混合器
CN113027573A (zh) * 2021-02-08 2021-06-25 凯龙高科技股份有限公司 一种壁流涡旋式混合器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206267925U (zh) * 2016-11-25 2017-06-20 天纳克（苏州）排放系统有限公司 排气后处理装置
WO2019045701A1 (fr) 2017-08-30 2019-03-07 Faurecia Emissions Control Technologies, Usa, Llc Cône d'injecteur de type venturi
CN118728526A (zh) * 2018-01-26 2024-10-01 天纳克（苏州）排放系统有限公司 排气后处理装置
CN108979805B (zh) * 2018-09-07 2023-08-29 安徽艾可蓝环保股份有限公司 一种满足国六排放标准的新型scr系统混合扰流装置
CN110578581A (zh) * 2019-09-30 2019-12-17 潍柴动力股份有限公司 一种scr后处理装置及其进气混合装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010032518A1 (fr) * 2008-09-18 2010-03-25 いすゞ自動車株式会社 Dispositif d’épuration des gaz d’échappement et procédé d’épuration des gaz d’échappement
CN105134349A (zh) * 2015-08-21 2015-12-09 天纳克（苏州）排放系统有限公司 排气处理装置
CN105971697A (zh) * 2015-03-10 2016-09-28 曼卡车和巴士股份公司 用于来自机动车辆的排出气体的后处理的装置
CN205605279U (zh) * 2016-04-12 2016-09-28 天纳克（苏州）排放系统有限公司 混合组件
CN206267925U (zh) * 2016-11-25 2017-06-20 天纳克（苏州）排放系统有限公司 排气后处理装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010032518A1 (fr) * 2008-09-18 2010-03-25 いすゞ自動車株式会社 Dispositif d’épuration des gaz d’échappement et procédé d’épuration des gaz d’échappement
CN105971697A (zh) * 2015-03-10 2016-09-28 曼卡车和巴士股份公司 用于来自机动车辆的排出气体的后处理的装置
CN105134349A (zh) * 2015-08-21 2015-12-09 天纳克（苏州）排放系统有限公司 排气处理装置
CN205605279U (zh) * 2016-04-12 2016-09-28 天纳克（苏州）排放系统有限公司 混合组件
CN206267925U (zh) * 2016-11-25 2017-06-20 天纳克（苏州）排放系统有限公司 排气后处理装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110439658A (zh) * 2019-08-12 2019-11-12 郑州精益达环保科技有限公司 一种国六scr前端尿素混合结构
CN111878197A (zh) * 2020-03-05 2020-11-03 广西玉柴机器股份有限公司 一种scr高效混合器
CN113027573A (zh) * 2021-02-08 2021-06-25 凯龙高科技股份有限公司 一种壁流涡旋式混合器

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