WO2021018266A1 - 尾气后处理装置 - Google Patents

尾气后处理装置 Download PDF

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Publication number
WO2021018266A1
WO2021018266A1 PCT/CN2020/106039 CN2020106039W WO2021018266A1 WO 2021018266 A1 WO2021018266 A1 WO 2021018266A1 CN 2020106039 W CN2020106039 W CN 2020106039W WO 2021018266 A1 WO2021018266 A1 WO 2021018266A1
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Prior art keywords
exhaust gas
carrier
treatment device
cavity
annular
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PCT/CN2020/106039
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English (en)
French (fr)
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杨振球
李军良
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天纳克（苏州）排放系统有限公司
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Publication of WO2021018266A1 publication Critical patent/WO2021018266A1/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
    • 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
    • F01N3/24—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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing

Definitions

  • the application relates to an exhaust gas aftertreatment device, which belongs to the technical field of engine exhaust gas aftertreatment.
  • Existing exhaust gas aftertreatment devices usually include several aftertreatment units arranged in series, for example, diesel oxidizer (DOC), diesel particulate filter (DPF) and selective catalytic reduction (SCR).
  • DOC diesel oxidizer
  • DPF diesel particulate filter
  • SCR selective catalytic reduction
  • a mixer and a urea crushing plate located in the mixer are usually installed upstream of the selective catalytic reduction unit.
  • the surface temperature is likely to be low, which increases the risk of urea crystallization.
  • the purpose of the present application is to provide a tail gas post-treatment device with a long mixing path of tail gas and urea droplets and a lower risk of urea crystallization.
  • an exhaust gas aftertreatment device which includes a first aftertreatment unit, a second aftertreatment unit located downstream of the first aftertreatment unit, and The mixing cavity between the processing unit and the second post-processing unit, the mixing cavity is used for the urea nozzle to spray atomized urea droplets into the mixing cavity;
  • the first post-processing unit includes a first A housing and a first carrier packaged in the first housing;
  • the second post-processing unit includes an outer housing, a second housing located in the outer housing, and a second housing packaged in the second housing A carrier and an annular cavity located between the outer shell and the second housing;
  • the second carrier is provided with an inlet end and an outlet end, wherein the inlet end is compared to the outlet end Farther away from the mixing cavity, one end of the annular cavity is in communication with the mixing cavity, and the other end of the annular cavity is in communication with the inlet end;
  • the exhaust gas after-treatment device is provided with A crushing splitter plate for crushing and splitting the
  • the crushing splitter plate has an arc-shaped protrusion protruding toward the first carrier.
  • the exhaust gas post-processing device is provided with an air outlet pipe communicating with the air outlet cavity.
  • the exhaust gas after-treatment device is provided with a cyclone mixer located downstream of the first after-treatment unit and upstream of the mixing chamber.
  • the exhaust gas after-treatment device is provided with an annular mixer installed in the annular cavity, the second housing passes through the annular mixer, and the annular mixer is fixed in The outer wall is fixed on the inner wall of the second casing.
  • the exhaust gas post-treatment device is provided with an annular baffle installed in the annular cavity and located downstream of the annular mixer.
  • the outer shell is provided with a flow deflector facing the inlet end, and the annular flow deflector is located upstream of the flow deflector and close to the flow deflector.
  • the first post-processing unit and the second post-processing unit are arranged in a straight line, or side by side, or vertically.
  • the first post-processing unit further includes a third carrier located between the first carrier and the mixing cavity, the first carrier is a diesel oxidizer carrier, and the The third carrier is a diesel particulate trap carrier, and the second carrier is a selective catalytic reduction carrier.
  • the second carrier includes two sections and a gap between the two sections, wherein the airflow in the gap can pass through the tube wall of the second housing to the annular The air flow in the cavity is heated.
  • this application designs the inlet end to be farther away from the mixing cavity than the outlet end, thereby increasing the mixing distance; in addition, by exposing the front and back of the crushing manifold to the corresponding mixing cavity In the body and the air outlet cavity, the heat of the exhaust gas can be used to heat the broken manifold on both sides, which reduces the risk of urea crystallization.
  • Fig. 1 is a schematic diagram of an exhaust gas after-treatment device of the present application in an embodiment.
  • Fig. 2 is a schematic diagram of the exhaust gas after-treatment device of the present application in another embodiment.
  • FIG. 1 discloses two exhaust gas after-treatment devices, which include a first after-treatment unit 1, a second after-treatment unit 2 located downstream of the first after-treatment unit 1, The mixing cavity 3 between the first post-processing unit 1 and the second post-processing unit 2.
  • the mixing cavity 3 is used for the urea nozzle 31 to spray atomized urea droplets into the mixing cavity 3 to mix with the exhaust gas.
  • the first post-processing unit 1 and the second post-processing unit 2 are arranged along a straight line.
  • the exhaust gas after-treatment device is called a linear exhaust gas after-treatment device.
  • FIG. 2 the first after-treatment unit 1 and the second after-treatment unit 2 are arranged side by side.
  • the exhaust gas after-treatment device is called a side-by-side exhaust gas after-treatment device.
  • the first post-processing unit 1 and the second post-processing unit 2 may also be arranged vertically.
  • the linear exhaust gas after-treatment device does not require that the first after-treatment unit 1 and the second after-treatment unit 2 are completely aligned, and a certain skew is allowed; similarly, the side-by-side exhaust gas after-treatment device does not require the first A post-processing unit 1 and a second post-processing unit 2 are parallel to each other, allowing a certain angle.
  • the flow direction of the airflow in the exhaust gas aftertreatment device is shown by the solid arrow.
  • the second post-processing unit 2 includes an outer housing 21, a second housing 22 located in the outer housing 21, a second carrier 23 encapsulated in the second housing 22, and located in the outer housing 21 and The annular cavity 20 between the second shells 22.
  • the second carrier 23 has an inlet end 231 and an outlet end 232, wherein the inlet end 231 is farther away from the mixing cavity 3 than the outlet end 232.
  • One end of the annular cavity 20 communicates with the mixing cavity 3, and the other end of the annular cavity 20 communicates with the inlet end 231.
  • the first post-processing unit 1 includes a first housing 11 and a first carrier 12 encapsulated in the first housing 11.
  • the first housing 11 is provided with an air inlet pipe 111.
  • the first post-processing unit 1 further includes a third carrier 13 located between the first carrier 12 and the mixing cavity 3, wherein the first carrier 12 is Diesel oxidizer carrier (DOC), the third carrier 13 is a diesel particulate filter carrier (DPF), and the second carrier 23 is a selective catalytic reduction carrier (SCR).
  • the second carrier 23 includes two sections and a gap 233 between the two sections, wherein the airflow in the gap 233 can pass through the tube wall 221 of the second housing 22 to the annular cavity.
  • the air flow in the body 20 is heated (see the dotted arrow between the two second carriers 23) to reduce the risk of urea crystallization.
  • the diameter of the outer shell 21 is larger than the diameter of the first shell 11.
  • the exhaust gas aftertreatment device is provided with a cyclone mixer 4 located downstream of the first aftertreatment unit 1 and upstream of the mixing cavity 3, and an annular mixer 5 installed in the annular cavity 20 , An annular baffle 6 installed in the annular cavity 20 and located downstream of the annular mixer 5.
  • the annular mixer 5 is close to the mixing cavity 3.
  • the cyclone mixer 4 can be used as a primary mixer to convert the tail gas flowing out of the third carrier 13 into a cyclone, so as to be able to better wrap the urea droplets in the mixing cavity 3;
  • the annular mixer 5 of the mixing chamber 3 can be used as a secondary mixer.
  • the airflow from the first post-processing unit 1 passes through the annular baffle 6 and then rotates, which can better realize the uniformity of the tail gas and the urea droplets. mixing.
  • the design difficulty of the cyclone mixer 4 and the annular mixer 5 itself can be simplified; and compared with the existing mixer, the annular mixer 5 is easier to increase the end surface area to improve the exhaust gas and the urea liquid. The mixing effect of drops.
  • the outer shell 21 is provided with a deflector 24 facing the inlet end 231, and the annular deflector 6 is located upstream of the deflector 24 and close to the deflector 24.
  • the diversion cover 24 is provided with diversion protrusions 241 protruding toward the inlet end 231.
  • the annular baffle 6 can perform a certain rectification function, so as to cooperate with the baffle 24 to evenly distribute the air flow to the inlet end 231.
  • the second housing 22 passes through and is erected on the annular mixer 5 and the annular deflector 6, and the annular mixer 5 and the annular deflector 6 They are all fixed on the inner wall of the outer shell 21 and fixed on the outer wall of the second shell 22. With this arrangement, the second housing 22 can be fixed by the annular mixer 5 and the annular baffle 6.
  • the exhaust gas post-processing device is provided with a crushing splitter plate 7 for crushing and splitting the urea droplets, and the second housing 22 is provided with an outlet gas between the crushing splitter plate 7 and the outlet end 231 Cavities 70.
  • the exhaust gas post-processing device is provided with an air outlet pipe 8 communicating with the air outlet cavity 70.
  • the crushing and dividing plate 7 is provided with a front surface 71 exposed in the mixing cavity 3 and a back surface 72 exposed in the air outlet cavity 70.
  • the crushing and dividing plate 7 has an arc-shaped protrusion 73 protruding toward the first carrier 12.
  • the urea droplets ejected from the urea nozzle 31 can be further broken on the breaking manifold 7 to make them smaller particles, which facilitate the evaporation of urea; the arc-shaped protrusion 73 is beneficial to separate the exhaust gas from the urea droplets
  • the mixed air flow is uniformly distributed into the annular cavity 20 along the radial direction.
  • the front face 71 of the crushing splitter plate 7 is exposed in the mixing chamber 3, so that the heat of the exhaust gas from the outlet of the first post-processing unit 1 can be used to heat the front face 71, which reduces the risk of urea crystallization due to low surface temperature; , By introducing the airflow at the front end of the air outlet pipe 8, the heat of the exhaust tail gas from the second post-processing unit 2 can be used to heat the back surface 72 of the crushing splitter plate 7, which further increases the temperature of the crushing splitter plate 7 and reduces urea crystallization risk.

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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

一种尾气后处理装置，其包括第一后处理单元（1）、第二后处理单元（2）以及混合腔体（3）；第二后处理单元（2）包括外壳体（21）、位于外壳体（21）内的第二壳体（22）、第二载体（23）以及位于外壳体（21）与第二壳体（22）之间的环形腔体（20）；第二载体（23）设有入口端部（231）以及出口端部（232），其中入口端部（231）相较于出口端部（232）更远离所述混合腔体（3）；尾气后处理装置设有用以破碎且分流尿素液滴的破碎分流板（7），第二壳体（22）设有位于破碎分流板（7）与出口端部（232）之间的出气腔体（70）。相较于现有技术，将入口端部（231）相较于出口端部（232）设计为更远离混合腔体（3），从而增加了混合距离；另外，利用尾气的热量对破碎分流板（7）进行双面加热，降低了尿素结晶的风险。

Description

尾气后处理装置
本申请要求了申请日为2019年07月31日、申请号为201910698373.3、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
本申请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
现有的尾气后处理装置通常包括若干个串联布置的后处理单元，例如，柴油氧化器(DOC)、柴油颗粒捕集器(DPF)以及选择性催化还原器(SCR)。为了实现尿素液滴与尾气的均匀混合，以促进尿素的热解、水解，通常会在选择性催化还原器的上游设置混合器以及位于混合器中的尿素破碎板。然而，尿素破碎板由于与尿素液滴的换热，容易使其表面温度不高，从而增加了尿素结晶风险。
发明内容
本申请的目的在于提供一种尾气与尿素液滴的混合路径较长且尿素结晶风险较低的尾气后处理装置。
为实现上述目的，本申请采用如下技术方案：一种尾气后处理装置，其包括第一后处理单元、位于所述第一后处理单元的下游的第二后处理单元、位于所述第一后处理单元与所述第二后处理单元之间的混合腔体，所述混合腔体用以供尿素喷嘴向所述混合腔体内喷射雾化的尿素液滴；所述第一后处理单元包括第一壳体以及封装在所述第一壳体内的第一载体；所述第二后处理单元包括外壳体、位于所述外壳体内的第二壳体、封装在所述第二壳体内的第二载体以及位于所述外壳体与所述第二壳体之间的环形腔体；所述第二载体设有入口端 部以及出口端部，其中所述入口端部相较于所述出口端部更远离所述混合腔体，所述环形腔体的一端与所述混合腔体相连通，所述环形腔体的另一端与所述入口端部相连通；所述尾气后处理装置设有用以破碎以及分流所述尿素液滴的破碎分流板，所述第二壳体设有位于所述破碎分流板与所述出口端部之间的出气腔体，所述破碎分流板设有暴露在所述混合腔体内的正面以及暴露在所述出气腔体内的背面。
作为本申请进一步改进的技术方案，所述破碎分流板具有向所述第一载体凸出的弧形凸起。
作为本申请进一步改进的技术方案，所述尾气后处理装置设有与所述出气腔体相连通的出气管。
作为本申请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第一后处理单元的下游且位于所述混合腔体的上游的旋流混合器。
作为本申请进一步改进的技术方案，所述尾气后处理装置设有安装在所述环形腔体内的环形混合器，所述第二壳体穿过所述环形混合器，所述环形混合器固定在所述外壳体的内壁上且固定在所述第二壳体的外壁上。
作为本申请进一步改进的技术方案，所述尾气后处理装置设有安装在所述环形腔体内且位于所述环形混合器的下游的环形导流板。
作为本申请进一步改进的技术方案，所述外壳体设有面向所述入口端部的导流罩，所述环形导流板位于所述导流罩的上游且靠近所述导流罩。
作为本申请进一步改进的技术方案，所述第一后处理单元与所述第二后处理单元沿直线布置、或者并排布置、或者垂直布置。
作为本申请进一步改进的技术方案，所述第一后处理单元还包括位于所述第一载体与所述混合腔体之间的第三载体，所述第一载体为柴油氧化器载体，所述第三载体为柴油颗粒捕集器载体，所述第二载体为选择性催化还原载体。
作为本申请进一步改进的技术方案，所述第二载体包括两段以及位于这两段之间的空隙，其中位于所述空隙中的气流能够通过所述第二壳体的管壁对所述环形腔体中气流进行加热。
相较于现有技术，本申请将入口端部相较于出口端部设计为更远离混合腔体，从而增加了混合距离；另外，通过将破碎分流板的正面以及背面暴露在相应的混合腔体以及出气腔体内，可以利用尾气的热量对破碎分流板进行双面加热，降低了尿素结晶的风险。
附图说明
图1是本申请尾气后处理装置在一种实施方式中的示意图。
图2是本申请尾气后处理装置在另一种实施方式中的示意图。
具体实施方式
请参图1及图2所示，本申请揭示了两种尾气后处理装置，其包括第一后处理单元1、位于所述第一后处理单元1的下游的第二后处理单元2、位于所述第一后处理单元1与所述第二后处理单元2之间的混合腔体3。所述混合腔体3用以供尿素喷嘴31向所述混合腔体3内喷射雾化的尿素液滴，以与尾气进行混合。请参图1所示，所述第一后处理单元1与所述第二后处理单元2沿直线布置，此时，所述尾气后处理装置被称之为直线型尾气后处理装置。请参图2所示，所述第一后处理单元1与所述第二后处理单元2并排布置，此时，所述尾气后处理装置被称之为并排型尾气后处理装置。当然，在其他实施方式中，所述第一后处理单元1与所述第二后处理单元2也可以垂直布置。需要说明的是，直线型尾气后处理装置并不要求第一后处理单元1与第二后处理单元2完全对齐，允许有一定的偏斜；类似地，并排型尾气后处理装置并不要求第一后处理单元1与第二后处理单元2相互平行，允许有一定的角度。本申请图示的实施方式中，尾气后处理装置中气流的流向请参实心箭头所示。
所述第二后处理单元2包括外壳体21、位于所述外壳体21内的第二壳体22、封装在所述第二壳体22内的第二载体23以及位于所述外壳体21与所述第二壳体22之间的环形腔体20。所述第二载体23设有入口端部231以及出口端部232，其中所述入口端部231相较于所述出口端部232更远离所述混合腔体3。所述环形腔体20的一端与所述混合腔体3相连通，所述环形腔体20的另一端 与所述入口端部231相连通。如此设置，从混合腔体3流出的气流先流入环形腔体20，并自入口端部231折回流动，以提高尾气与尿素液滴的混合距离。
所述第一后处理单元1包括第一壳体11以及封装在所述第一壳体11内的第一载体12。所述第一壳体11设有进气管111。在本申请图示的实施方式中，所述第一后处理单元1还包括位于所述第一载体12与所述混合腔体3之间的第三载体13，其中所述第一载体12为柴油氧化器载体(DOC)，所述第三载体13为柴油颗粒捕集器载体(DPF)，所述第二载体23为选择性催化还原载体(SCR)。优选地，所述第二载体23包括两段以及位于这两段之间的空隙233，其中位于所述空隙233中的气流能够通过所述第二壳体22的管壁221对所述环形腔体20中气流进行加热(参两段第二载体23之间的虚线箭头所示)，降低尿素结晶的风险。在本申请图示的实施方式中，所述外壳体21的直径大于所述第一壳体11的直径。
所述尾气后处理装置设有位于所述第一后处理单元1的下游且位于所述混合腔体3的上游的旋流混合器4、安装在所述环形腔体20内的环形混合器5、安装在所述环形腔体20内且位于所述环形混合器5的下游的环形导流板6。所述环形混合器5靠近所述混合腔体3。所述旋流混合器4，可以作为初级混合器，用以将流出所述第三载体13的尾气形成旋流，以能够在混合腔体3中较好地包裹住尿素液滴；靠近所述混合腔体3的环形混合器5可以作为次级混合器，从所述第一后处理单元1出来的气流经过环形导流板6后发生旋转，能够更好地实现尾气与尿素液滴的均匀混合。通过设置两级混合器，可以简化旋流混合器4以及环形混合器5本身的设计难度；而且，环形混合器5相较于现有的混合器更容易增加端面面积，以提高尾气与尿素液滴的混合效果。
所述外壳体21设有面向所述入口端部231的导流罩24，所述环形导流板6位于所述导流罩24的上游且靠近所述导流罩24。所述导流罩24设有向所述入口端部231凸出的导流凸起241。所述环形导流板6能够起到一定的整流作用，以便于与导流罩24相配合，均匀地将气流分配到入口端部231。
在本申请图示的实施方式中，所述第二壳体22穿过并架设在所述环形混合 器5以及环形导流板6上，所述环形混合器5与所述环形导流板6均固定在所述外壳体21的内壁上且固定在所述第二壳体22的外壁上。如此设置，可以利用环形混合器5以及环形导流板6对第二壳体22进行固定。
所述尾气后处理装置设有用以破碎且分流所述尿素液滴的破碎分流板7，所述第二壳体22设有位于所述破碎分流板7与所述出口端部231之间的出气腔体70。所述尾气后处理装置设有与所述出气腔体70相连通的出气管8。所述破碎分流板7设有暴露在所述混合腔体3内的正面71以及暴露在所述出气腔体70内的背面72。所述破碎分流板7具有向所述第一载体12凸出的弧形凸起73。如此设置，从尿素喷嘴31喷出来的尿素液滴能够在破碎分流板7上进一步发生破碎，使之成为更小的颗粒，便于尿素的蒸发；弧形凸起73有利于将尾气与尿素液滴的混合气流沿着径向向外均匀分布到环形腔体20中。破碎分流板7的正面71暴露在混合腔体3中，从而能够利用第一后处理单元1的出口尾气的热量对正面71进行加热，降低了因表面温度过低而造成尿素结晶的风险；另外，通过将出气管8前端的气流导入，从而能够利用第二后处理单元2的出口尾气的热量对破碎分流板7的背面72进行加热，进一步提高了破碎分流板7的温度，降低了尿素结晶风险。
以上实施例仅用于说明本申请而并非限制本申请所描述的技术方案，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申请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申请进行修改或者等同替换，而一切不脱离本申请的精神和范围的技术方案及其改进，均应涵盖在本申请的权利要求范围内。

Claims (10)

  1. 一种尾气后处理装置，其包括第一后处理单元、位于所述第一后处理单元的下游的第二后处理单元、位于所述第一后处理单元与所述第二后处理单元之间的混合腔体，所述混合腔体用以供尿素喷嘴向所述混合腔体内喷射雾化的尿素液滴；所述第一后处理单元包括第一壳体以及封装在所述第一壳体内的第一载体；其特征在于：所述第二后处理单元包括外壳体、位于所述外壳体内的第二壳体、封装在所述第二壳体内的第二载体以及位于所述外壳体与所述第二壳体之间的环形腔体；所述第二载体设有入口端部以及出口端部，其中所述入口端部相较于所述出口端部更远离所述混合腔体，所述环形腔体的一端与所述混合腔体相连通，所述环形腔体的另一端与所述入口端部相连通；所述尾气后处理装置设有用以破碎以及分流所述尿素液滴的破碎分流板，所述第二壳体设有位于所述破碎分流板与所述出口端部之间的出气腔体，所述破碎分流板设有暴露在所述混合腔体内的正面以及暴露在所述出气腔体内的背面。
  2. 如权利要求1所述的尾气后处理装置，其特征在于：所述破碎分流板具有向所述第一载体凸出的弧形凸起。
  3. 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与所述出气腔体相连通的出气管。
  4. 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第一后处理单元的下游且位于所述混合腔体的上游的旋流混合器。
  5. 如权利要求4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安装在所述环形腔体内的环形混合器，所述第二壳体穿过所述环形混合器，所述环形混合器固定在所述外壳体的内壁上且固定在所述第二壳体的外壁上。
  6. 如权利要求5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安装在所述环形腔体内且位于所述环形混合器的下游的环形导流板。
  7. 如权利要求6所述的尾气后处理装置，其特征在于：所述外壳体设有面向所述入口端部的导流罩，所述环形导流板位于所述导流罩的上游且靠近所述导流罩。
  8. 如权利要求1所述的尾气后处理装置，其特征在于：所述第一后处理单元与所述第二后处理单元沿直线布置、或者并排布置、或者垂直布置。
  9. 如权利要求1所述的尾气后处理装置，其特征在于：所述第一后处理单元还包括位于所述第一载体与所述混合腔体之间的第三载体，所述第一载体为柴油氧化器载体，所述第三载体为柴油颗粒捕集器载体，所述第二载体为选择性催化还原载体。
  10. 如权利要求1所述的尾气后处理装置，其特征在于：所述第二载体包括两段以及位于这两段之间的空隙，其中位于所述空隙中的气流能够通过所述第二壳体的管壁对所述环形腔体中气流进行加热。
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