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WO2018153162A1 - 尾气后处理装置 - Google Patents

尾气后处理装置 Download PDF

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Publication number
WO2018153162A1
WO2018153162A1 PCT/CN2017/119329 CN2017119329W WO2018153162A1 WO 2018153162 A1 WO2018153162 A1 WO 2018153162A1 CN 2017119329 W CN2017119329 W CN 2017119329W WO 2018153162 A1 WO2018153162 A1 WO 2018153162A1
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WO
WIPO (PCT)
Prior art keywords
mixing tube
axis
carrier assembly
aftertreatment
tube
Prior art date
Application number
PCT/CN2017/119329
Other languages
English (en)
French (fr)
Inventor
王聪
陈智
王天宇
Original Assignee
天纳克（苏州）排放系统有限公司
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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 WO2018153162A1 publication Critical patent/WO2018153162A1/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
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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

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 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. The uneven distribution of urea droplets will cause the local tube wall or mixed structure temperature to be too low to form crystallization. In severe cases, the tail gas pipe will be blocked, resulting in a decrease in engine power performance. In addition, while considering the anti-crystallization ability, how to reduce the back pressure of the system is also a technical problem to be solved.
  • SCR system selective catalytic reduction system
  • an exhaust aftertreatment device including a first post-processing carrier assembly, a second post-processing carrier assembly, and the first post-processing carrier assembly and the second rear Processing a mixer assembly between the carrier assemblies, wherein the mixer assembly includes a housing, a mixing tube positioned within the housing, and a baffle secured to a periphery of the mixing tube, the baffle placing the housing Separating into a first space in communication with the first aftertreatment carrier assembly and a second space in communication with the second aftertreatment carrier assembly, the mixing tube including a first tube located within the first space And a second tube portion located in the second space, wherein the first tube portion is provided with at least two first openings respectively located at two sides thereof, and the second tube portion is respectively disposed at two sides thereof At least two second openings, the mixer assembly further comprising at least two perforated plates located within the mixing tube and staggered along an axis of the mixing tube.
  • the first post-treatment carrier assembly, the second post-treatment carrier assembly, and the mixer assembly are arranged in a straight line.
  • the housing is provided with a first axis
  • the mixing tube is provided with a second axis, the first axis intersecting the second axis.
  • the first axis is perpendicular to the second axis.
  • the partition plate includes an inclined portion disposed obliquely to the second axis of the mixing tube and an extending portion extending downward from the inclined portion, the extending portion including the abutting portion The curved surface on the mixing tube.
  • the mixer assembly includes a bowl cover at a bottom of the mixing tube, the bowl cover is fixed at a lower end of the second tube portion, and the bowl cover is provided to the first A circular arc-shaped projection extending in the second tube portion.
  • the exhaust gas aftertreatment device is provided with a nozzle mounting seat on the casing and used to install a urea nozzle to spray the atomized urea solution into the mixing tube.
  • the at least two perforated plates comprise a first perforated plate and a second perforated plate, wherein the first perforated plate and the second perforated plate are semicircular
  • the first perforated plate is provided with a plurality of first openings
  • the second perforated plate is provided with a plurality of second openings.
  • the perforated plates are formed into at least one circle as viewed along the axis of the mixing tube.
  • the first aperture plate is provided with a plurality of first fixing claws fixed on an inner wall of the mixing tube, and the second aperture plate is provided to be fixed in the mixing A plurality of second fixed jaws on the inner wall of the tube.
  • the present invention enhances the breaking of urea particles by setting at least two perforated plates which are located in the mixing tube and are staggered along the axis of the mixing tube, and also enhances heat exchange and improves mixing. effect.
  • Figure 1 is a perspective view of an exhaust gas aftertreatment device of the present invention.
  • Figure 2 is a perspective view of another angle of Figure 1.
  • Fig. 3 is a partially exploded perspective view of Fig. 2;
  • FIG. 4 is a partial exploded perspective view of the mixer assembly of FIG. 3.
  • Figure 5 is a further exploded perspective view of Figure 4.
  • Figure 6 is a plan view of the mixing tube, the partition, the first perforated plate and the second perforated plate of Figure 4 assembled together.
  • Fig. 7 is a schematic cross-sectional view taken along line C-C of Fig. 3.
  • Figure 8 is a schematic cross-sectional view taken along line A-A of Figure 2;
  • Figure 9 is a cross-sectional view taken along line B-B of Figure 2 .
  • the present invention discloses an exhaust aftertreatment device 100 for treating the exhaust of an engine.
  • the exhaust aftertreatment device 100 includes a first aftertreatment carrier assembly 1, a second aftertreatment carrier assembly 2, and a mixer assembly between the first aftertreatment carrier assembly 1 and the second aftertreatment carrier assembly 2 3.
  • the first aftertreatment carrier assembly 1, the second aftertreatment carrier assembly 2, and the mixer assembly 3 are arranged in a straight line.
  • the first aftertreatment carrier assembly 1 includes an oxidation catalyst (DOC) 11 and a diesel particulate filter (DPF) 12 located downstream of the oxidation catalyst 11 .
  • the second post-treatment carrier assembly 2 includes a selective catalytic reduction agent (SCR) 21.
  • SCR selective catalytic reduction agent
  • the mixer assembly 3 includes a housing 31, a mixing tube 32 located within the housing 31, a partition 33 fixed to the periphery of the mixing tube 32, a bowl cover 34 at the bottom of the mixing tube 32, and At least two perforated plates are disposed in the mixing tube 32 and staggered along the axis of the mixing tube 32.
  • the at least two apertured plates comprise a first apertured plate 35 and a second apertured plate 36.
  • the partition plate 33 partitions the casing 31 into a first space 331 communicating with the first after-treatment carrier assembly 1 and the second rear A second space 332 in which the carrier assembly 2 is in communication is processed.
  • the mixing tube 32 includes a first tube portion 321 located in the first space 331 and a second tube portion 322 located in the second space 332, wherein the first tube portion 321 is respectively disposed at two of the tubes At least two first openings 3211 on the side, the second tube portions 322 are provided with at least two second openings 3221 on opposite sides thereof.
  • the first opening 3211 is for the airflow to enter, and the second opening 3221 is for the airflow to flow to form a double swirling mixing effect.
  • the housing 31 has a cylindrical shape and is provided with a first axis 311;
  • the mixing tube 32 has a cylindrical shape, and is provided with a second axis 323, the first The axis 311 intersects the second axis 323.
  • the first axis 311 is perpendicular to the second axis 323.
  • the housing 31 and the mixing tube 32 may have other shapes, such as an elliptical shape or the like.
  • the partition 33 includes an inclined portion 333 disposed obliquely to the second axis 323 of the mixing tube 32 and an extending portion 334 extending downward from the inclined portion 333, the extending portion 334 including abutting against the mixing An arcuate surface 335 on the tube 32.
  • the bowl cover 34 is fixed to the lower end of the second tube portion 322, and the bowl cover 34 is provided with a circular arc-shaped protrusion 341 extending into the second tube portion 322 to guide the reverse flow of the airflow. Passing through the second opening 3221.
  • the bowl lid 34 prevents the urea solution from being directly sprayed onto the exhaust pipe, thereby reducing the risk of urea crystallization.
  • the exhaust aftertreatment device 100 is provided with a nozzle mount 310 on the housing 31 for mounting a urea nozzle to inject a urea solution after atomization into the mixing tube 32.
  • the first perforated plate 35 and the second perforated plate 36 are each semi-circular, and the first perforated plate 35 is provided with a plurality of first openings 351.
  • the second aperture plate 36 is provided with a plurality of second openings 361.
  • the first perforated plate 35 and the second perforated plate 36 are formed into at least one circle as viewed along the axis of the mixing tube 32.
  • the first perforated plate 35 and the second perforated plate 36 are just formed into a circle.
  • the first perforated plate 35 and the second perforated plate 36 may have overlapping portions to form more than one circle.
  • the perforated plate may also be three or more pieces, and at this time, the perforated plates are formed into at least one circle.
  • the first perforated plate 35 is provided with a plurality of first fixing claws 352 for fixing on the inner wall of the mixing tube 32
  • the second perforated plate 36 is provided for fixing on the inner wall of the mixing tube 32.
  • the crushing of the urea particles is enhanced, and the mixing effect is enhanced; in addition, the heat exchange is enhanced, and the formation of crystals due to the local temperature is too low. risk.
  • it is a one-piece perforated plate, in order to achieve better urea crushing, it is necessary to provide an opening with a smaller pore size, which inevitably leads to a higher back pressure; however, if the back pressure is reduced, the pore size is bound to be enlarged, so that Achieve good fracture of urea.
  • exhaust gas enters the mixing tube 32 from the first opening 3211 as the exhaust of the engine passes through the first aftertreatment carrier assembly 1 into the first space 331.
  • the urea nozzle injects urea into the mixing tube 32, and the atomized urea droplets are mixed with the exhaust gas of the engine and moved downstream.
  • the first perforated plate 35 and the second perforated plate 36 enhance heat exchange and breakage of urea particles. Referring to the spiral arrow in FIG. 9, then, under the blockage of the bowl cover 34, the airflow is better reversed (eg, upstream); the airflow after the reverse direction passes through the second opening 3221 to form a double Swirl.
  • the gas stream then enters the second space 332 and reaches the second post-treatment carrier assembly 2 located downstream.
  • the distance and time of urea evaporation are increased, the uniformity of gas flow mixing is improved, and the risk of urea crystallization is reduced.

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

Abstract

一种尾气后处理装置，其包括第一后处理载体组件（1）、第二后处理载体组件（2）以及混合器组件（3），其中混合器组件包括壳体（31）、混合管（32）以及固定在混合管（32）的外围的隔板（33）。隔板（33）将壳体（31）分隔成与第一后处理载体组件(1)相连通的第一空间（331）以及与第二后处理载体组件（2）相连通的第二空间（332）。混合管（32）包括分别位于其两侧的至少两个第一开口（3211）以及至少两个第二开口（3221）。混合器组件（3）还包括位于混合管（32）内且沿混合管（32）的轴线交错设置的至少两个开孔板（35、36）。

Description

尾气后处理装置
本申请要求了申请日为2017年2月22日、申请号为201710097519.X、发明名称为“尾气后处理装置”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
本发明涉及一种尾气后处理装置，属于发动机尾气后处理技术领域。
背景技术
研究表明尾气后处理系统(例如选择性催化还原系统，SCR系统)管路中氨分布的均匀程度对系统的整体性能和耐久性能有重要的影响。如果氨分布不均匀会导致局部区域氨过多从而易造成氨泄漏，而在另一些氨稀薄区域造成氮氧化合物(NOx)转化效率过低。长时间氨的不均匀分布会导致催化剂老化不均匀，从而影响催化剂的整体性能。尿素液滴的不均匀分布会造成局部管壁或混合结构温度过低，形成结晶，严重时会堵塞尾气管、导致发动机动力性能下降。另外，在考虑抗结晶能力的同时，如何降低系统的背压也是需要解决的技术问题。
发明内容
本发明的目的在于提供一种混合效果较好的尾气后处理装置。
为实现上述目的，本发明采用如下技术方案：一种尾气后处理装置，其包括第一后处理载体组件、第二后处理载体组件以及位于所述第一后处理载体组件与所述第二后处理载体组件之间的混合器组件，其中所述混合器组件包括壳体、位于所述壳体内的混合管以及固定在所述混合管的外围的隔板，所述隔板将所述壳体分隔成与所述第一后处理载体组件相连通的第一空间以及与所述第二后处理载体组件相连通的第二空间，所述混合管包括位于所述第一空间内的第一管部以及位于所述第二空间内的第二管部，其中所述第一管部设有分别位于其两侧的至少两个第一开口，所述第二管部设有分别位于其两侧的至少两个第二开口，所述混合器组件还包括位于所述混合管内且沿所述混合管的轴线交错设置的至少两个开孔板。
作为本发明进一步改进的技术方案，所述第一后处理载体组件、所述第二后处理载体组件以及所述混合器组件布置在一条直线上。
作为本发明进一步改进的技术方案，所述壳体设有第一轴线，所述混合管设有第二轴线，所述第一轴线与所述第二轴线交叉。
作为本发明进一步改进的技术方案，所述第一轴线垂直于所述第二轴线。
作为本发明进一步改进的技术方案，所述隔板包括与所述混合管的第二轴线倾斜设置的倾斜部以及自所述倾斜部向下延伸的延伸部，所述延伸部包括贴靠在所述混合管上的弧形表面。
作为本发明进一步改进的技术方案，所述混合器组件包括位于所述混合管底部的碗盖，所述碗盖固定在所述第二管部的下端，所述碗盖设有向所述第二管部内延伸的圆弧形凸起。
作为本发明进一步改进的技术方案，所述尾气后处理装置设有位于所述壳体上且用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述混合管内的喷嘴安装座。
作为本发明进一步改进的技术方案，所述至少两个开孔板包括第一开孔板以及第二开孔板，所述第一开孔板与所述第二开孔板均呈半圆形，所述第一开孔板设有若干第一开孔，所述第二开孔板设有若干第二开孔。
作为本发明进一步改进的技术方案，沿所述混合管的轴线观察，这些开孔板至少拼成一个圆。
作为本发明进一步改进的技术方案，所述第一开孔板设有用以固定在所述混合管的内壁上的若干第一固定爪，所述第二开孔板设有用以固定在所述混合管的内壁上的若干第二固定爪。
相较于现有技术，本发明通过设置位于所述混合管内且沿所述混合管的轴线交错设置的至少两个开孔板，增强了尿素颗粒的破碎，也加强了换热，提高了混合效果。
附图说明
图1是本发明尾气后处理装置的立体示意图。
图2是图1另一角度的立体示意图。
图3是图2的部分立体分解图。
图4是图3中混合器组件的部分立体分解图。
图5是图4进一步的立体分解图。
图6是图4中混合管、隔板、第一开孔板以及第二开孔板组装在一起后的俯视图。
图7是沿图3中C-C线的剖面示意图。
图8是沿图2中A-A线的剖面示意图。
图9是沿图2中B-B线的剖面示意图。
具体实施方式
请参图1至图9所示，本发明揭示了一种尾气后处理装置100，用以处理发动机的尾气。所述尾气后处理装置100包括第一后处理载体组件1、第二后处理载体组件2以及位于所述第一后处理载体组件1与所述第二后处理载体组件2之间的混合器组件3。在本发明图示的实施方式中，所述第一后处理载体组件1、所述第二后处理载体组件2以及所述混合器组件3布置在一条直线上。所述第一后处理载体组件1包括氧化催化器(DOC)11以及位于所述氧化催化器11下游的柴油颗粒过滤器(DPF)12。所述第二后处理载体组件2包括选择性催化还原剂(SCR)21。上述氧化催化器11、柴油颗粒过滤器12以及选择性催化还原剂21通过卡箍进行可拆卸地连接，以便于维修与更换。
所述混合器组件3包括壳体31、位于所述壳体31内的混合管32、固定在所述混合管32的外围的隔板33、位于所述混合管32底部的碗盖34以及位于所述混合管32内且沿所述混合管32的轴线交错设置的至少两个开孔板。在本发明图示的实施方式中，所述至少两个开孔板包括第一开孔板35以及第二开孔板36。请参图3、图7以及图8所示，所述隔板33将所述壳体31分隔成与所述第一后处理载体组件1相连通的第一空间331以及与所述第二后处理载体组件2相连通的第二空间332。所述混合管32包括位于所述第一空间331内的第一管部321以及位于所述第二空间332内的第二管部322，其中所述第一管部321设有分别位于其两侧的至少两个第一开口3211，所述第二管部322设有分别位于其两侧的至少两个第二开口3221。所述第一开口3211用以供气流进入，所述第二开口3221用以供气流流出，以形成双旋流的混合效果。
在本发明图示的实施方式中，所述壳体31呈圆筒状，其设有第一轴线311；所述混合管32呈圆筒状，其设有第二轴线323，所述第一轴线311与所述第二轴线323交叉。优选地，所述第一轴线311垂直于所述第二轴线323。当然，在其他实施方式中，所述壳体31与所述混合管32也可以是其他形状，例如椭圆形等。
所述隔板33包括与所述混合管32的第二轴线323倾斜设置的倾斜部333以及自所述倾斜部333向下延伸的延伸部334，所述延伸部334包括贴靠在所述混合管32上的弧形表面335。
所述碗盖34固定在所述第二管部322的下端，所述碗盖34设有向所述第二管部322内延伸的圆弧形凸起341，以导引气流反向流动以穿过所述第二开口3221。所述碗盖34能够避免尿素 溶液被直接喷射到排气管上，从而降低了尿素结晶的风险。
所述尾气后处理装置100设有位于所述壳体31上且用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述混合管32内的喷嘴安装座310。
在本发明图示的实施方式中，所述第一开孔板35与所述第二开孔板36均呈半圆形，所述第一开孔板35设有若干第一开孔351，所述第二开孔板36设有若干第二开孔361。请参图6所示，沿所述混合管32的轴线观察，所述第一开孔板35与所述第二开孔板36至少拼成一个圆。在本发明图示的实施方式中，所述第一开孔板35与所述第二开孔板36刚好拼成一个圆。当然，可以理解，在其他实施方式中，所述第一开孔板35与所述第二开孔板36也可以有相互重叠的部分，以拼成超过一个圆。在其他实施方式中，所述开孔板也可以为三片或者三片以上，此时这些开孔板至少拼成一个圆。所述第一开孔板35设有用以固定在所述混合管32的内壁上的若干第一固定爪352，所述第二开孔板36设有用以固定在所述混合管32的内壁上的若干第二固定爪362。
通过设置所述第一开孔板35以及第二开孔板36，增强了尿素颗粒的破碎，提高了混合的效果；另外，也加强了换热，降低了因局部温度过低而形成结晶的风险。如果是一片式的开孔板，为了实现较好的尿素破碎，其需要设置孔径较小的开孔，这样必然导致背压较高；但如果为了降低背压，势必会扩大孔径，这样又无法实现对尿素良好的破碎。本发明通过将第一开孔板35以及第二开孔板36交错设置，在它们之间也形成了气流穿过的区域S1(参图7所示)，从而降低了背压，同时又不影响对尿素颗粒的破碎，取得了意料不到的技术效果。
在本发明图示的实施方式中，当发动机的尾气穿过第一后处理载体组件1进入到第一空间331内时，尾气自第一开口3211进入混合管32。当满足喷射条件时，尿素喷嘴向混合管32中喷射尿素，雾化的尿素液滴与发动机的尾气一起混合并向下游移动。所述第一开孔板35与第二开孔板36增强了换热以及尿素颗粒的破碎。请参图9中的螺旋线箭头所示，随后，在碗盖34的阻挡下更好地使气流反向(例如向上游)流动；反向之后的气流穿过第二开口3221，以形成双旋流。随后，气流进入到第二空间332内，并到达位于下游的第二后处理载体组件2。如此设置，通过旋流以及对尿素颗粒破碎，增加了尿素蒸发的距离和时间，提高了气流混合的均匀性，降低了尿素结晶的风险。
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. 一种尾气后处理装置，其包括第一后处理载体组件、第二后处理载体组件以及位于所述第一后处理载体组件与所述第二后处理载体组件之间的混合器组件，其中所述混合器组件包括壳体、位于所述壳体内的混合管以及固定在所述混合管的外围的隔板，所述隔板将所述壳体分隔成与所述第一后处理载体组件相连通的第一空间以及与所述第二后处理载体组件相连通的第二空间，所述混合管包括位于所述第一空间内的第一管部以及位于所述第二空间内的第二管部，其中所述第一管部设有分别位于其两侧的至少两个第一开口，所述第二管部设有分别位于其两侧的至少两个第二开口，其特征在于：所述混合器组件还包括位于所述混合管内且沿所述混合管的轴线交错设置的至少两个开孔板。
  2. 如权利要求1所述的尾气后处理装置，其特征在于：所述第一后处理载体组件、所述第二后处理载体组件以及所述混合器组件布置在一条直线上。
  3. 如权利要求2所述的尾气后处理装置，其特征在于：所述壳体设有第一轴线，所述混合管设有第二轴线，所述第一轴线与所述第二轴线交叉。
  4. 如权利要求3所述的尾气后处理装置，其特征在于：所述第一轴线垂直于所述第二轴线。
  5. 如权利要求3所述的尾气后处理装置，其特征在于：所述隔板包括与所述混合管的第二轴线倾斜设置的倾斜部以及自所述倾斜部向下延伸的延伸部，所述延伸部包括贴靠在所述混合管上的弧形表面。
  6. 如权利要求1所述的尾气后处理装置，其特征在于：所述混合器组件包括位于所述混合管底部的碗盖，所述碗盖固定在所述第二管部的下端，所述碗盖设有向所述第二管部内延伸的圆弧形凸起。
  7. 如权利要求1所述的尾气后处理装置，其特征在于：所述尾气后处理装置设有位于所述壳体上且用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述混合管内的喷嘴安装座。
  8. 如权利要求1至7项中任意一项所述的尾气后处理装置，其特征在于：所述至少两个开孔板包括第一开孔板以及第二开孔板，所述第一开孔板与所述第二开孔板均呈半圆形，所述第一开 孔板设有若干第一开孔，所述第二开孔板设有若干第二开孔。
  9. 如权利要求1至7项中任意一项所述的尾气后处理装置，其特征在于：沿所述混合管的轴线观察，这些开孔板至少拼成一个圆。
  10. 如权利要求8所述的尾气后处理装置，其特征在于：所述第一开孔板设有用以固定在所述混合管的内壁上的若干第一固定爪，所述第二开孔板设有用以固定在所述混合管的内壁上的若干第二固定爪。
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