WO2018095139A1 - 排气后处理装置 - Google Patents

排气后处理装置 Download PDF

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Publication number
WO2018095139A1
WO2018095139A1 PCT/CN2017/104324 CN2017104324W WO2018095139A1 WO 2018095139 A1 WO2018095139 A1 WO 2018095139A1 CN 2017104324 W CN2017104324 W CN 2017104324W WO 2018095139 A1 WO2018095139 A1 WO 2018095139A1
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Prior art keywords
baffle
space
mixing tube
exhaust
housing
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PCT/CN2017/104324
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English (en)
French (fr)
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郑鑫
毛伟
王聪
王长林
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天纳克（苏州）排放系统有限公司
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Publication of WO2018095139A1 publication Critical patent/WO2018095139A1/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
    • F01N3/18—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
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • 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
    • 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
    • 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
    • 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 including a casing, a mixing pipe installed in the casing, and a post-processing carrier located in the casing, the casing being provided a first end cover, a second end cover, and an annular side wall, the housing being provided with an exhaust inlet on the annular side wall and an exhaust outlet on the second end cover, the housing further Providing a first baffle and a second baffle to partition the casing into a first space between the first end cap and the first baffle, at the first baffle and the a second space between the second baffles and a third space between the second baffle and the second end cap, the mixing tube being erected on the first baffle, the second baffle, and a second end cap, the first baffle is a non-porous baffle to partition the first space from the second space, and the second baffle is provided with an opening for the mixing tube to pass through And a plurality of communication holes connecting the second space and the third space,
  • the annular side wall has a rectangular parallelepiped, and the exhaust gas inlet is located at an corner of the rectangular parallelepiped.
  • the size of the opening is larger than the size of the mixing tube so that the exhaust gas enters the third space from the second space, and then passes through the rotation in the third space.
  • the flow sheet enters the mixing tube.
  • the mixing tube has a cylindrical shape, and the opening has a rectangular shape.
  • the second end cover is provided with a nozzle mounting seat for mounting a urea nozzle for injecting urea droplets into the mixing tube.
  • the inner side of the first end cover is provided with a shroud that is aligned with the mixing tube and is used to force the airflow to reverse.
  • the shroud is provided with an arc-shaped inner surface.
  • the post-treatment support comprises a selective catalytic reducing agent.
  • the present invention improves the mixing uniformity of the exhaust gas and the urea droplets by providing the swirling sheet. Further, by having the exhaust gas inlet facing the mixing pipe, the mixing pipe can be heated by the exhaust gas temperature, which reduces the risk of urea crystallization.
  • Figure 1 is a perspective view of an exhaust aftertreatment device of the present invention.
  • Fig. 2 is a partially exploded perspective view of Fig. 1;
  • Figure 3 is a further exploded perspective view of the housing of Figure 2 removed.
  • Figure 4 is a right side elevational view of Figure 1 at an angle.
  • Figure 5 is a cross-sectional view taken along line A-A of Figure 4.
  • the present invention discloses an exhaust aftertreatment device 100 for treating exhaust gases from an engine.
  • the exhaust aftertreatment device 100 includes a housing 1, a mixing tube 2 mounted in the housing 1, and a post-processing carrier 3 located in the housing 1.
  • the housing 1 is provided with a first end cap 11, a second end cap 12 and an annular side wall 13.
  • the housing 1 is provided with an exhaust gas inlet 14 on the annular side wall 13 and an exhaust gas outlet 15 on the second end cover 12.
  • the housing is further provided with a first baffle 16 and a second baffle 17 to partition the casing 1 into a first position between the first end cover 11 and the first baffle 16 a space 110, a second space 120 between the first baffle 16 and the second baffle 17, and a third space 130 between the second baffle 17 and the second end cover 12.
  • the annular side wall 13 is in the shape of a rectangular parallelepiped, and the exhaust gas inlet 14 is located at an angle of the rectangular parallelepiped.
  • the exhaust gas inlet 14 faces the mixing tube 2, so that the mixing tube 2 can be heated by the exhaust gas temperature, reducing the risk of urea crystallization.
  • the inner side of the first end cap 11 is provided with a shroud 111 that is aligned with the mixing tube 2 and that is used to force the airflow to reverse.
  • the shroud 111 is provided with an arcuate inner surface 112.
  • the second end cover 12 is provided with a nozzle mount 121 for mounting a urea nozzle (not shown) for injecting urea droplets into the mixing tube 2.
  • the mixing tube 2 is mounted on the first baffle 16, the second baffle 17, and the second end cap 12.
  • the first baffle 16 is a non-porous baffle to block the first space 110 from the second space 120.
  • the second baffle 17 is provided with an opening 171 through which the mixing tube 2 passes and a plurality of communication holes 172 that communicate the second space 120 and the third space 130.
  • the mixing tube 2 is provided with a plurality of swirling sheets 21, which are located on both sides of the second flap 17, thereby enlarging the area in which the exhaust gas enters.
  • the mixing tube 2 has a cylindrical shape, and the opening 171 has a rectangular shape. The size of the opening 171 is larger than the size of the mixing tube 2 so that exhaust gas enters the third space 130 from the second space 120, and then enters through the swirling sheet 21 located in the third space 130.
  • the post-treatment support 3 comprises a selective catalytic reduction agent.
  • One end of the post-treatment carrier 3 is in communication with the first cavity 110, and the other end of the post-treatment carrier 3 is in communication with the exhaust outlet 15.
  • the shroud 111 is capable of forcing the flow of gas to reverse flow to some extent; subsequently, the mixed gas stream of exhaust gas and urea droplets enters the aftertreatment carrier 3 from the first space 110 and eventually exits from the exhaust outlet 15.

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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

一种排气后处理装置（100），包括壳体（1）、混合管（2）以及后处理载体（3），壳体（1）设有第一端盖（11）、第二端盖（12）以及环形侧壁（13），壳体（1）设有排气入口（14）以及排气出口（15），壳体（1）还设有第一挡板（16）以及第二挡板（17），以将壳体（1）隔成第一空间（110）、第二空间（120）以及第三空间（130），第二挡板（17）设有供混合管（2）穿过的开孔（171）以及连通第二空间（120）与第三空间（130）的若干连通孔（172），混合管（2）设有若干旋流片（21），旋流片（21）位于第二挡板（17）的两侧，后处理载体（3）的一端与第一空间（110）连通，后处理载体（3）的另一端与排气出口（15）连通，排气入口（14）正对混合管（2）。该排气后处理装置提高了气流混合的均匀性，降低了尿素结晶的风险。

Description

排气后处理装置
本申请要求了申请日为2016年11月25日、申请号为201611059454.1、发明名称为“排气后处理装置”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
本发明涉及一种排气后处理装置，属于发动机排气后处理技术领域。
背景技术
研究表明排气后处理系统(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。另外，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，严重时会堵塞排气管、导致发动机动力性能下降。
因此，有必要提供一种新型的排气后处理装置，以解决上述技术问题。
发明内容
本发明的目的在于提供一种混合均匀且尿素结晶风险较低的排气后处理装置。
为实现上述目的，本发明采用如下技术方案：一种排气后处理装置，其包括壳体、安装于所述壳体内混合管以及位于所述壳体内的后处理载体，所述壳体设有第一端盖、第二端盖以及环形侧壁，所述壳体设有位于所述环形侧壁上的排气入口以及位于所述第二端盖上的排气出口，所述壳体还设有第一挡板以及第二挡板以将所述壳体隔成位于所述第一端盖与所述第一挡板之间的第一空间、位于所述第一挡板与所述第二挡板之间的第二空间以及位于所述第二挡板与所述第二端盖之间的第三空间，所述混合管架设在所述第一挡板、第二挡板以及第二端盖上，所述第一挡板是无孔挡板以将所述第一空间与所述第二空间隔断，所述第二挡板设有供所述混合管穿过的开孔以及连通所述第二空间与所述第三空间的若干连通孔，所述混合管设有若干旋流片，所述旋流片位于所述第二挡板的两侧；所述后处理载体的一端与所述第一腔体连通，所述后处理载体的另一端与所述排气出口连通；所述排气入口正对所述混合管。
作为本发明进一步改进的技术方案，所述环形侧壁呈长方体，所述排气入口位于该长方体的一个棱角处。
作为本发明进一步改进的技术方案，所述开孔的尺寸大于所述混合管的尺寸以便于排气自所述第二空间进入所述第三空间，再通过位于所述第三空间内的旋流片进入所述混合管。
作为本发明进一步改进的技术方案，所述混合管呈圆筒状，所述开孔呈矩形。
作为本发明进一步改进的技术方案，所述第二端盖上设有喷嘴安装座用以安装向所述混合管内喷射尿素液滴的尿素喷嘴。
作为本发明进一步改进的技术方案，所述第一端盖的内侧设有与所述混合管相对齐且用以迫使气流反向的导流罩。
作为本发明进一步改进的技术方案，所述导流罩设有圆弧状的内表面。
作为本发明进一步改进的技术方案，所述后处理载体包括选择性催化还原剂。
相较于现有技术，本发明通过设置旋流片提高了排气与尿素液滴的混合均匀性。另外，通过使排气入口正对混合管，能够利用排气温度对混合管进行加热，降低了尿素结晶的风险。
附图说明
图1是本发明排气后处理装置的立体示意图。
图2是图1的部分立体分解图。
图3是去除图2中壳体后进一步的立体分解图。
图4是图1某一角度的右视图。
图5是沿图4中A-A线的剖面示意图。
具体实施方式
请参图1至图5所示，本发明揭示了一种排气后处理装置100，用于处理发动机的排气。所述排气后处理装置100包括壳体1、安装于所述壳体1内混合管2以及位于所述壳体1内的后处理载体3。
所述壳体1设有第一端盖11、第二端盖12以及环形侧壁13。所述壳体1设有位于所述环形侧壁13上的排气入口14以及位于所述第二端盖12上的排气出口15。所述壳体还设有第一挡板16以及第二挡板17，以将所述壳体1隔成位于所述第一端盖11与所述第一挡板16之间的第一 空间110、位于所述第一挡板16与所述第二挡板17之间的第二空间120以及位于所述第二挡板17与所述第二端盖12之间的第三空间130。在本发明图示的实施方式中，所述环形侧壁13呈长方体，所述排气入口14位于该长方体的一个棱角处。所述排气入口14正对所述混合管2，从而能够利用排气温度对混合管2进行加热，降低尿素结晶的风险。
所述第一端盖11的内侧设有与所述混合管2相对齐且用以迫使气流反向的导流罩111。所述导流罩111设有圆弧状的内表面112。
所述第二端盖12上设有喷嘴安装座121用以安装向所述混合管2内喷射尿素液滴的尿素喷嘴(未图示)。
所述混合管2架设在所述第一挡板16、第二挡板17以及第二端盖12上。所述第一挡板16是无孔挡板以将所述第一空间110与所述第二空间120隔断。所述第二挡板17设有供所述混合管2穿过的开孔171以及连通所述第二空间120与所述第三空间130的若干连通孔172。所述混合管2设有若干旋流片21，所述旋流片21位于所述第二挡板17的两侧，从而扩大排气进入的面积。所述混合管2呈圆筒状，所述开孔171呈矩形。所述开孔171的尺寸大于所述混合管2的尺寸以便于排气自所述第二空间120进入所述第三空间130，再通过位于所述第三空间130内的旋流片21进入所述混合管2。
所述后处理载体3包括选择性催化还原剂。所述后处理载体3的一端与所述第一腔体110连通，所述后处理载体3的另一端与所述排气出口15连通。
当发动机的排气自排气入口14进入第二空间120时，一部分排气直接通过位于第二空间120内的旋流片21进入混合管2，另一部分排气穿过第二挡板17并自位于第三空间130内的旋流片21进入混合管2；当满足喷射条件时，尿素喷嘴向混合管21中喷射尿素，雾化的尿素液滴与发动机的排气一起混合并向下游旋转；导流罩111能够在一定程度上迫使气流反向流动；随后，排气与尿素液滴的混合气流自第一空间110进入后处理载体3，并最终自排气出口15离开。
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 (8)

  1. 一种排气后处理装置，其包括壳体、安装于所述壳体内混合管以及位于所述壳体内的后处理载体，所述壳体设有第一端盖、第二端盖以及环形侧壁，所述壳体设有位于所述环形侧壁上的排气入口以及位于所述第二端盖上的排气出口，所述壳体还设有第一挡板以及第二挡板以将所述壳体隔成位于所述第一端盖与所述第一挡板之间的第一空间、位于所述第一挡板与所述第二挡板之间的第二空间以及位于所述第二挡板与所述第二端盖之间的第三空间，其特征在于：所述混合管架设在所述第一挡板、第二挡板以及第二端盖上，所述第一挡板是无孔挡板以将所述第一空间与所述第二空间隔断，所述第二挡板设有供所述混合管穿过的开孔以及连通所述第二空间与所述第三空间的若干连通孔，所述混合管设有若干旋流片，所述旋流片位于所述第二挡板的两侧；所述后处理载体的一端与所述第一腔体连通，所述后处理载体的另一端与所述排气出口连通；所述排气入口正对所述混合管。
  2. 如权利要求1所述的排气后处理装置，其特征在于：所述环形侧壁呈长方体，所述排气入口位于该长方体的一个棱角处。
  3. 如权利要求1所述的排气后处理装置，其特征在于：所述开孔的尺寸大于所述混合管的尺寸以便于排气自所述第二空间进入所述第三空间，再通过位于所述第三空间内的旋流片进入所述混合管。
  4. 如权利要求3所述的排气后处理装置，其特征在于：所述混合管呈圆筒状，所述开孔呈矩形。
  5. 如权利要求1所述的排气后处理装置，其特征在于：所述第二端盖上设有喷嘴安装座用以安装向所述混合管内喷射尿素液滴的尿素喷嘴。
  6. 如权利要求1所述的排气后处理装置，其特征在于：所述第一端盖的内侧设有与所述混合管相对齐且用以迫使气流反向的导流罩。
  7. 如权利要求6所述的排气后处理装置，其特征在于：所述导流罩设有圆弧状的内表面。
  8. 如权利要求1所述的排气后处理装置，其特征在于：所述后处理载体包括选择性催化还原剂。
PCT/CN2017/104324 2016-11-25 2017-09-29 排气后处理装置 WO2018095139A1 (zh)

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