WO2017206945A1 - 发动机排气后处理系统 - Google Patents

发动机排气后处理系统 Download PDF

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Publication number
WO2017206945A1
WO2017206945A1 PCT/CN2017/086994 CN2017086994W WO2017206945A1 WO 2017206945 A1 WO2017206945 A1 WO 2017206945A1 CN 2017086994 W CN2017086994 W CN 2017086994W WO 2017206945 A1 WO2017206945 A1 WO 2017206945A1
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WIPO (PCT)
Prior art keywords
tube
assembly
mixing
engine exhaust
aftertreatment system
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PCT/CN2017/086994
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English (en)
French (fr)
Inventor
王聪
童毅君
陈智
毛伟
王林
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天纳克（苏州）排放系统有限公司
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Publication of WO2017206945A1 publication Critical patent/WO2017206945A1/zh

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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
    • 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
    • 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
    • F01N13/009—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 two or more separate purifying devices arranged in series
    • 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
    • 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]
    • F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing

Definitions

  • the present invention relates to an engine exhaust aftertreatment system.
  • Engine exhaust aftertreatment systems are primarily devices used to treat or evolve toxic and hazardous materials in the exhaust.
  • the poisonous substances in the exhaust gas mainly include hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter.
  • the oxidation type catalytic converter and the particle trap are disposed in series in the first housing, and additionally provided a first cavity in communication with the first housing; the selective catalytic reducing agent And disposed in the second housing, and additionally providing a second cavity in communication with the second housing; and then connecting the first and second cavities in series by means of a mixing tube.
  • the exhaust gas is mixed with the urea droplets in the mixing tube, and the mixture then enters the second chamber and is passed through a selective catalytic reducing agent to reduce harmful substances.
  • the urea droplets ejected from the urea nozzle are liable to directly contact the tube wall of the mixing tube, thereby generating crystallization.
  • an engine exhaust aftertreatment system including a first aftertreatment component, a first mixing cavity component in communication with the first aftertreatment component, and the first a mixing tube assembly in communication with the mixing chamber assembly
  • the mixing tube assembly includes a mixing tube at least partially located in the first mixing chamber assembly and a connecting tube in communication with the mixing tube, the mixing tube including a hollow interior a cavity, a plurality of fins surrounding the periphery of the inner cavity and circumferentially distributed, a plurality of slots corresponding to the plurality of fins and communicating with the inner cavity, and one side of the fin
  • the mixing tube assembly further comprising a draft tube located in the connecting tube, the draft tube being fixed on an inner wall of the connecting tube and the guiding tube a gap between the outer surface and the inner wall of the connecting tube, the appearance of the guiding tube
  • the surface has a plurality of through holes.
  • the draft tube includes a first end adjacent to the mixing tube and a second end opposite the first end, wherein the second end is open.
  • the draft tube has a cylindrical shape, and the first end is provided with a plurality of outwardly expanding claw portions, and the plurality of claw portions are welded and fixed on the inner wall of the connecting tube. A groove for passing the exhaust gas is formed between the adjacent two claw portions.
  • the draft tube has a truncated cone shape, the diameter of the first end is larger than the diameter of the second end, and the first end is welded and fixed on the inner wall of the connecting tube.
  • the mixing tube is welded and fixed to the connecting tube.
  • the mixing tube assembly further includes an outer tube that is sleeved at a periphery of the connecting tube.
  • the engine exhaust aftertreatment system further includes a second aftertreatment component disposed alongside the first aftertreatment component and a second mixing cavity in communication with the second aftertreatment component An assembly, the mixing tube assembly being coupled between the first mixing chamber assembly and the second mixing chamber assembly; the first aftertreatment assembly and the second aftertreatment assembly being coupled by the first mixing chamber The assembly, the mixing tube assembly, and the second mixing chamber assembly are connected in series.
  • the first aftertreatment component comprises a diesel oxidation catalyst and/or a diesel particulate trap
  • the second aftertreatment component comprises a selective catalytic reducing agent
  • the through hole has a circular shape.
  • the urea nozzle mounting portion is used to mount a urea nozzle, and the urea nozzle is provided with an injection region, the draft tube being at least partially located in the injection region.
  • the present invention reduces the amount of urea directly contacting the pipe wall of the connecting pipe by providing a draft tube, thereby reducing the risk of urea crystallization.
  • Figure 1 is a perspective view of an engine exhaust aftertreatment system 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 1.
  • Fig. 3 is a partially exploded perspective view of Fig. 2;
  • Fig. 4 is a partially exploded perspective view of Fig. 1;
  • Figure 5 is a partially exploded perspective view of another angle of Figure 4.
  • Figure 6 is an exploded perspective view of the mixing tube assembly of Figure 1 in a first embodiment.
  • Figure 7 is a perspective view of the draft tube of Figure 6.
  • Figure 8 is an exploded perspective view of the mixing tube assembly of Figure 1 in a second embodiment.
  • Figure 9 is a cross-sectional view of the engine exhaust aftertreatment system of the first embodiment taken along line A-A of Figure 3 .
  • Figure 10 is a cross-sectional view of the engine exhaust aftertreatment system of the first embodiment taken along line B-B of Figure 3 .
  • Figure 11 is a cross-sectional view of the engine exhaust aftertreatment system of the second embodiment taken along line A-A of Figure 3 .
  • Figure 12 is a cross-sectional view of the engine exhaust aftertreatment system of the second embodiment taken along line B-B of Figure 3 .
  • the present invention discloses an engine exhaust aftertreatment system 100 including a first aftertreatment assembly 1 and a first mixing chamber assembly 2 in communication with the first aftertreatment assembly 1. a second aftertreatment assembly 3 disposed side by side with the first aftertreatment assembly 1, a second mixing chamber assembly 4 in communication with the second aftertreatment assembly 3, and a communication with the first and second mixing chamber assemblies 2, 4 mixed tube assembly 5.
  • the first aftertreatment component 1 and the second aftertreatment component 3 are connected in series by the first and second mixing chamber assemblies 2, 4 and the mixing tube assembly 5.
  • the first aftertreatment assembly 1 includes a first housing 11 , an oxidation type catalytic converter (DOC) 12 mounted in the first housing 11 , and is mounted on the A particulate trap (DPF) 13 in the first housing 11 and an exhaust inlet 14 upstream of the oxidizing catalytic converter 12.
  • DOC oxidation type catalytic converter
  • DPF particulate trap
  • the second aftertreatment assembly 3 includes a second housing 31, a selective catalytic reducing agent (SCR) 32 mounted within the second housing 31, and the selection The exhaust outlet 33 downstream of the catalytic reducing agent 32.
  • SCR selective catalytic reducing agent
  • the first mixing chamber assembly 2 and the second mixing chamber assembly 4 are substantially identical in shape.
  • the first mixing chamber assembly 2 is for directing exhaust gas from the first aftertreatment assembly 1 to the mixing tube assembly 5.
  • the first mixing chamber assembly 2 is provided with a urea nozzle mounting portion 21 at a position facing the mixing tube assembly 5 for mounting a urea nozzle (not shown).
  • the mixing tube assembly 5 includes a mixing tube 51 at least partially located in the first mixing chamber assembly 2, and is connected to the mixing tube 51.
  • the mixing tube 51 includes a hollow inner cavity 511 surrounding the periphery of the inner cavity 511 and along a plurality of fins 512 distributed circumferentially, a plurality of slots 513 corresponding to the plurality of fins 512 and communicating with the inner cavity 511, and a side of the fin 512 adjacent to the urea nozzle mounting portion 21 A plurality of openings 514.
  • the draft tube 53 is fixed on the inner wall of the connecting tube 52 and has a gap between the outer surface 531 of the draft tube 53 and the inner wall of the connecting tube 52, and the outer surface 531 of the guiding tube 53 There are a plurality of through holes 532 therethrough. In the illustrated embodiment of the invention, the through hole 532 is circular.
  • the draft tube 53 includes a first end 533 adjacent the mixing tube 51 and a second end 534 opposite the first end 533, wherein the second end 534 is open.
  • the draft tube 53 has a cylindrical shape, and the first end 533 is provided with a plurality of outwardly expanding claw portions 535, and the plurality of claw portions 535.
  • the welding is fixed on the inner wall of the connecting pipe 52, and a groove 536 through which the exhaust gas passes is formed between the adjacent two claw portions 535.
  • the draft tube 53 has a truncated cone shape, the diameter of the first end 533 is larger than the diameter of the second end 534 , and the first end 533 is welded and fixed. On the inner wall of the connecting pipe 52.
  • the mixing tube 51 is welded and fixed to the connecting tube 52.
  • the mixing tube assembly 5 further includes an outer tube 54 that is sleeved around the periphery of the connecting tube 52.
  • a heat insulating material such as heat insulating cotton may be disposed between the connecting pipe 52 and the outer pipe 54, thereby achieving heat preservation and reducing the risk of urea crystallization.
  • the draft tube 53 is at least partially located in the injection region of the urea nozzle (refer to the upper and lower angle regions shown in FIG. 9 or FIG. 11), the injected urea is used. At least a part of the solution is directly in contact with the draft tube 53, thereby achieving the crushing of the urea droplets and reducing the risk of urea crystallization. If there are urea droplets remaining on the wall of the draft tube 53 or a small amount of precipitated urea crystals, it can also be blown outward by the exhaust swirl through the through holes 532. Further, since there is a gap between the outer surface 531 of the draft tube 53 and the inner wall of the connecting pipe 52, the exhaust gas can blow away the urea crystals through the gap.

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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)
  • Exhaust Gas After Treatment (AREA)

Abstract

一种发动机排气后处理系统，其包括第一后处理组件（1）、第一混合腔组件（2）以及混合管组件（5）。该混合管组件包括混合管（51）以及与该混合管相连通的连接管（52）。该混合管包括中空的内腔体（511）、围绕在该内腔体的外围且沿周向分布的若干翅片（512）、对应于该若干翅片且与该内腔体连通的若干开槽（513）以及位于该翅片的一侧的若干开孔（514）。该混合管组件还包括位于该连接管中的导流管（53），该导流管固定在该连接管的内壁上且该导流管的外表面与该连接管的内壁之间具有间隙，该导流管的外表面上具有若干贯穿的通孔。如此设置，降低了直接与连接管的管壁进行接触的尿素的量，降低了尿素结晶的风险。

Description

发动机排气后处理系统
本申请要求了申请日为2016年6月3日、申请号为201610388059.1、发明名称为“发动机排气后处理系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种发动机排气后处理系统。
背景技术
发动机排气后处理系统(例如柴油机排气后处理系统)主要是用来处理或进化排气中有毒及有害物质的装置。排气中的毒害物质主要包含碳氢化合物、一氧化碳、氮氧化物及颗粒物等。
现有技术中已经有采用柴油氧化催化剂(DOC)、柴油颗粒捕集器(DPF)以及选择性催化还原剂(SCR)相组合的方案来提高尾气处理的效能。在一种方案中，所述氧化型催化转换器与颗粒捕集器被串联设置在第一壳体内，并另外设置与该第一壳体连通的第一腔体；所述选择性催化还原剂被设置在第二壳体内，并另外设置与该第二壳体连通的第二腔体；然后借助混合管将所述第一、第二腔体串联起来。排气与尿素液滴在混合管中被混合，混合物随后进入第二腔体，再通过选择性催化还原剂，以降低有害物质。然而，尿素喷嘴喷射出来的尿素液滴容易直接接触混合管的管壁，从而产生结晶。
发明内容
本发明的目的在于提供一种能够降低尿素结晶风险的发动机排气后处理系统。
为实现上述目的，本发明采用如下技术方案：一种发动机排气后处理系统，其包括第一后处理组件、与所述第一后处理组件连通的第一混合腔组件以及与所述第一混合腔组件连通的混合管组件，其中所述混合管组件包括至少部分位于所述第一混合腔组件中的混合管以及与所述混合管相连通的连接管，所述混合管包括中空的内腔体、围绕在所述内腔体的外围且沿周向分布的若干翅片、对应于所述若干翅片且与所述内腔体连通的若干开槽以及位于所述翅片的一侧且靠近尿素喷嘴安装部的若干开孔，所述混合管组件还包括位于所述连接管中的导流管，所述导流管固定在所述连接管的内壁上且所述导流管的外表面与所述连接管的内壁之间具有间隙，所述导流管的外表 面上具有若干贯穿的通孔。
作为本发明进一步改进的技术方案，所述导流管包括靠近所述混合管的第一端以及与所述第一端相对的第二端，其中所述第二端是开放的。
作为本发明进一步改进的技术方案，所述导流管呈圆筒状，所述第一端设有若干向外扩张的爪部，所述若干爪部焊接固定在所述连接管的内壁上，相邻的两个爪部之间形成供排气穿过的开槽。
作为本发明进一步改进的技术方案，所述导流管呈圆台状，所述第一端的直径大于所述第二端的直径，且所述第一端焊接固定在所述连接管的内壁上。
作为本发明进一步改进的技术方案，所述混合管与所述连接管焊接固定在一起。
作为本发明进一步改进的技术方案，所述混合管组件还包括套接在所述连接管外围的外管。
作为本发明进一步改进的技术方案，所述发动机排气后处理系统还包括与所述第一后处理组件并排布置的第二后处理组件以及与所述第二后处理组件连通的第二混合腔组件，所述混合管组件连接在所述第一混合腔组件以及所述第二混合腔组件之间；所述第一后处理组件与所述第二后处理组件藉由所述第一混合腔组件、所述混合管组件以及所述第二混合腔组件实现串联。
作为本发明进一步改进的技术方案，所述第一后处理组件包括柴油氧化催化剂及/或柴油颗粒捕集器，所述第二后处理组件包括选择性催化还原剂。
作为本发明进一步改进的技术方案，所述通孔呈圆形。
作为本发明进一步改进的技术方案，所述尿素喷嘴安装部用以安装尿素喷嘴，所述尿素喷嘴设有喷射区域，所述导流管至少部分位于该喷射区域内。
相较于现有技术，本发明通过设置导流管，降低了直接与连接管的管壁进行接触的尿素的量，降低了尿素结晶的风险。
附图说明
图1是本发明发动机排气后处理系统的立体示意图。
图2是图1另一角度的立体示意图。
图3是图1的左视图。
图3是图2的部分立体分解图。
图4是图1的部分立体分解图。
图5是图4另一角度的部分立体分解图。
图6是图1中的混合管组件于第一实施方式中的立体分解图。
图7是图6中导流管的立体图。
图8是图1中的混合管组件于第二实施方式中的立体分解图。
图9是第一实施方式的发动机排气后处理系统沿图3中A-A线的剖面示意图。
图10是第一实施方式的发动机排气后处理系统沿图3中B-B线的剖面示意图。
图11是第二实施方式的发动机排气后处理系统沿图3中A-A线的剖面示意图。
图12是第二实施方式的发动机排气后处理系统沿图3中B-B线的剖面示意图。
具体实施方式
请参图1至图12所示，本发明揭示了一种发动机排气后处理系统100，其包括第一后处理组件1、与所述第一后处理组件1连通的第一混合腔组件2、与所述第一后处理组件1并排布置的第二后处理组件3、与所述第二后处理组件3连通的第二混合腔组件4、以及连通所述第一、第二混合腔组件2、4的混合管组件5。所述第一后处理组件1与所述第二后处理组件3藉由所述第一、第二混合腔组件2、4以及所述混合管组件5实现串联。
在本发明图示的实施方式中，所述第一后处理组件1包括第一壳体11、安装于所述第一壳体11内的氧化型催化转换器(DOC)12、安装于所述第一壳体11内的颗粒捕集器(DPF)13、以及位于所述氧化型催化转换器12上游的排气进口14。其中，所述氧化型催化转换器12位于所述颗粒捕集器13的上游，以在所述颗粒捕集器13再生时提供合适的温度。
在本发明图示的实施方式中，所述第二后处理组件3包括第二壳体31、安装于所述第二壳体31内的选择性催化还原剂(SCR)32以及位于所述选择性催化还原剂32下游的排气出口33。
在本发明图示的实施方式中，所述第一混合腔组件2与所述第二混合腔组件4的形状大致相同。所述第一混合腔组件2用以将来自所述第一后处理组件1的排气导向所述混合管组件5。所述第一混合腔组件2在正对所述混合管组件5的位置设有尿素喷嘴安装部21，用以安装尿素喷嘴(未图示)。
请参图6所示，在本发明图示的第一实施方式中，所述混合管组件5包括至少部分位于所述第一混合腔组件2中的混合管51、与所述混合管51相连通的连接管52以及位于所述连接管52中的导流管53。其中所述混合管51包括中空的内腔体511、围绕在所述内腔体511的外围且沿 周向分布的若干翅片512、对应于所述若干翅片512且与所述内腔体511连通的若干开槽513、以及位于所述翅片512的一侧且靠近尿素喷嘴安装部21的若干开孔514。所述导流管53固定在所述连接管52的内壁上且所述导流管53的外表面531与所述连接管52的内壁之间具有间隙，所述导流管53的外表面531上具有若干贯穿的通孔532。在本发明图示的实施方式中，所述通孔532呈圆形。
所述导流管53包括靠近所述混合管51的第一端533以及与所述第一端533相对的第二端534，其中所述第二端534是开放的。
请参图6、图7、图9以及图10所示，所述导流管53呈圆筒状，所述第一端533设有若干向外扩张的爪部535，所述若干爪部535焊接固定在所述连接管52的内壁上，相邻的两个爪部535之间形成供排气穿过的开槽536。
请参图8、图11以及图12所示，所述导流管53呈圆台状，所述第一端533的直径大于所述第二端534的直径，且所述第一端533焊接固定在所述连接管52的内壁上。
在本发明图示的实施方式中，所述混合管51与所述连接管52焊接固定在一起。所述混合管组件5还包括套接在所述连接管52外围的外管54。优选地，可以在连接管52与外管54之间设置隔热棉等隔热材料，从而实现保温，降低尿素结晶的风险。
本发明发动机排气后处理系统100在使用时，由于导流管53至少部分位于尿素喷嘴的喷射区域内(参图9或图11所示的上、下夹角区域)，因此喷射出来的尿素溶液中至少有一部分直接与导流管53进行接触，进而实现对尿素液滴进行破碎，降低尿素结晶的风险。如果有残留在导流管53管壁上的尿素液滴或析出的少量尿素结晶，也能够藉由穿过通孔532的排气旋流向外吹走。另外，由于导流管53的外表面531与所述连接管52的内壁之间具有间隙，排气能够通过该间隙将尿素结晶吹走。
另外，以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，对本说明书的理解应该以所属技术领域的技术人员为基础，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (10)

  1. 一种发动机排气后处理系统，其包括第一后处理组件、与所述第一后处理组件连通的第一混合腔组件以及与所述第一混合腔组件连通的混合管组件，其中所述混合管组件包括至少部分位于所述第一混合腔组件中的混合管以及与所述混合管相连通的连接管，所述混合管包括中空的内腔体、围绕在所述内腔体的外围且沿周向分布的若干翅片、对应于所述若干翅片且与所述内腔体连通的若干开槽以及位于所述翅片的一侧且靠近尿素喷嘴安装部的若干开孔，其特征在于：所述混合管组件还包括位于所述连接管中的导流管，所述导流管固定在所述连接管的内壁上且所述导流管的外表面与所述连接管的内壁之间具有间隙，所述导流管的外表面上具有若干贯穿的通孔。
  2. 如权利要求1所述的发动机排气后处理系统，其特征在于：所述导流管包括靠近所述混合管的第一端以及与所述第一端相对的第二端，其中所述第二端是开放的。
  3. 如权利要求2所述的发动机排气后处理系统，其特征在于：所述导流管呈圆筒状，所述第一端设有若干向外扩张的爪部，所述若干爪部焊接固定在所述连接管的内壁上，相邻的两个爪部之间形成供排气穿过的开槽。
  4. 如权利要求2所述的发动机排气后处理系统，其特征在于：所述导流管呈圆台状，所述第一端的直径大于所述第二端的直径，且所述第一端焊接固定在所述连接管的内壁上。
  5. 如权利要求1所述的发动机排气后处理系统，其特征在于：所述混合管与所述连接管焊接固定在一起。
  6. 如权利要求1所述的发动机排气后处理系统，其特征在于：所述混合管组件还包括套接在所述连接管外围的外管。
  7. 如权利要求1所述的发动机排气后处理系统，其特征在于：所述发动机排气后处理系统还包括与所述第一后处理组件并排布置的第二后处理组件以及与所述第二后处理组件连通的第二混合腔组件，所述混合管组件连接在所述第一混合腔组件以及所述第二混合腔组件之间；所述第一后处理组件与所述第二后处理组件藉由所述第一混合腔组件、所述混合管组件以及所述第二混合腔组件实现串联。
  8. 如权利要求7所述的发动机排气后处理系统，其特征在于：所述第一后处理组件包括柴油氧化催化剂及/或柴油颗粒捕集器，所述第二后处理组件包括选择性催化还原剂。
  9. 如权利要求1所述的发动机排气后处理系统，其特征在于：所述通孔呈圆形。
  10. 如权利要求1至9项中任意一项所述的发动机排气后处理系统，其特征在于：所述尿素喷嘴安装部用以安装尿素喷嘴，所述尿素喷嘴设有喷射区域，所述导流管至少部分位于该喷射区域内。
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