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WO2018006718A1 - Tail gas aftertreatment device - Google Patents

Tail gas aftertreatment device Download PDF

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Publication number
WO2018006718A1
WO2018006718A1 PCT/CN2017/089980 CN2017089980W WO2018006718A1 WO 2018006718 A1 WO2018006718 A1 WO 2018006718A1 CN 2017089980 W CN2017089980 W CN 2017089980W WO 2018006718 A1 WO2018006718 A1 WO 2018006718A1
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WIPO (PCT)
Prior art keywords
post
aftertreatment device
space
carrier
opening
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/CN2017/089980
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French (fr)
Chinese (zh)
Inventor
王聪
孙小冈
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
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Tenneco Suzhou Emission System Co Ltd
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Publication date
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Publication of WO2018006718A1 publication Critical patent/WO2018006718A1/en
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Ceased legal-status Critical Current

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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
    • 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

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. 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 tail gas pipe when severe, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • the combination of the mixing tube and the double tube can better improve the mixing effect of the urea droplets and the exhaust gas.
  • limited by space it is often difficult to optimize the design of the mixing tube, so that the application range is limited to a certain extent.
  • an exhaust gas after-treatment device comprising a casing, a first post-processing carrier located in the casing, a second post-processing carrier located in the casing, and being installed on a mixer assembly in the housing, wherein the first post-treatment carrier is located upstream of the second post-treatment carrier, the mixer assembly being located in the first post-treatment carrier and the second post-treatment carrier
  • the mixer assembly includes a mixing tube and a partition cooperating with the mixing tube, the partition separating the housing into a first space in communication with the first post-treatment carrier and a second space in which the second post-treatment carrier communicates, the mixing tube including a first tube portion located in the first space and a second tube portion located in the second space, wherein the first tube The portion is provided with a plurality of swirling fins, and the second tubular portion is provided with a first opening and a second opening respectively located on both sides to form a double swirling flow.
  • the partition plate comprises a first plate on one side of the mixing tube, a second plate on the other side of the mixing tube, and a connection between the first plate and the A third plate of the second plate is provided, and the third plate is provided with a through hole through which the mixing tube passes.
  • the separator has an S shape.
  • the mixer assembly includes a bowl cover at the bottom of the mixing tube.
  • the first opening and the second opening each extend downward through the second tube portion, and the bowl cover is fixed at a lower end of the second tube portion, the bowl cover An arcuate projection extending into the second tube portion is provided.
  • the exhaust gas aftertreatment device is provided with a nozzle mount for mounting a urea nozzle to spray the atomized urea solution into the mixing tube.
  • the first tube portion of the mixing tube includes a plurality of perforations located above the swirling sheet and adjacent to the nozzle mounting seat, the perforations being in communication with the first space.
  • the first opening and the second opening are both rectangular.
  • the first post-processing carrier and the second post-processing carrier are axially aligned with each other.
  • the mixing tube is perpendicular to the housing.
  • the present invention increases the distance and time of urea evaporation by forming a secondary swirling flow, improves the uniformity of gas flow mixing, and reduces the risk of urea crystallization.
  • Figure 1 is a perspective view of an exhaust gas 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 Figure 2.
  • FIG. 4 is an exploded perspective view of the mixer assembly and nozzle mount of FIG. 3.
  • Figure 5 is an exploded perspective view of another angle of Figure 4.
  • Figure 6 is a cross-sectional view taken along line A-A of Figure 1.
  • Figure 7 is a cross-sectional view taken along line B-B of Figure 1.
  • the present invention discloses an exhaust aftertreatment device 100 for treating the exhaust of an engine.
  • the exhaust aftertreatment device 100 includes a housing 1 , a first post-processing carrier 21 located in the housing 1 , a second post-processing carrier 22 located in the housing 1 , and a housing 1 mounted therein Mixer component 3.
  • the first post-processing carrier 21 is located upstream of the second post-processing carrier 22, and the mixer assembly 3 is located between the first post-processing carrier 21 and the second post-processing carrier 22.
  • the first aftertreatment carrier 21 and the second aftertreatment carrier 22 are axially aligned with one another.
  • the mixer assembly 3 includes a mixing tube 31, a partition 32 that cooperates with the mixing tube 31, and a bowl lid 33 at the bottom of the mixing tube 31.
  • the mixing tube 31 is perpendicular to the housing 1.
  • the exhaust gas after-treatment device 100 is provided with a nozzle mount 11 for mounting a urea nozzle to inject a urea solution after atomization into the mixing tube 31.
  • the partition 32 is S-shaped, which partitions the casing 1 into a first space 321 that communicates with the first after-treatment carrier 21 and a second space that communicates with the second after-treatment carrier 22 322.
  • the partition plate 32 includes a first plate 323 on one side of the mixing tube 31, a second plate 324 on the other side of the mixing tube 31, and a connection between the first plate 323 and the second A third plate 325 of the plate 324, the third plate 325 is provided with a through hole 326 through which the mixing tube 31 passes.
  • the first plate 323 and/or the second plate 324 may also be provided with a plurality of perforations to adjust the back pressure.
  • the mixing tube 31 includes a first tube portion 311 located in the first space 321 and a second tube portion 312 located in the second space 322.
  • the first tube portion 311 is provided with a plurality of swirling fins 3111 and a plurality of perforations 3112 located above the swirling fins 3111 and adjacent to the nozzle mounting seat 11.
  • the through hole 3112 is in communication with the first space 321 .
  • the second tube portion 312 is provided with a first opening 3121 and a second opening 3122 which are respectively located on both sides and are used to form a double swirl.
  • the first opening 3121 and the second opening 3122 each extend downward through the second tube portion 312.
  • the first opening 3121 and the second opening 3122 are each rectangular.
  • the bowl cover 33 is fixed to the lower end of the second tube portion 312, and the bowl cover 33 is provided with a circular arc-shaped protrusion 331 extending into the second tube portion 312 to guide the reverse flow of the airflow. Through the first opening 3121 and the second opening 3122.
  • the bowl lid 33 prevents the urea solution from being directly sprayed onto the exhaust pipe, thereby reducing the risk of urea crystallization.
  • the exhaust gas of the engine passes through the first after-treatment carrier 21 into the first space 321, most of the exhaust gas is rotated under the guidance of the swirling plate 3111 into the mixing tube 31.
  • a small amount of exhaust gas enters the mixing tube 31 from the perforation 3112.
  • the urea nozzle injects urea into the mixing tube 31, the atomized urea droplets and the engine
  • the exhaust gases are mixed together and rotated downstream. Referring to the spiral arrow in FIG. 7, then, under the blockage of the bowl cover 33, the airflow is better reversed (for example, upstream); the airflow after the reverse direction passes through the first opening 3121 and the second opening. 3122 to form a double swirl.
  • the gas stream then enters the second space 322 and reaches the second post-treatment carrier 22 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

Disclosed is a tail gas aftertreatment device, comprising a casing (1), a first aftertreatment carrier (21), a second aftertreatment carrier (22) and a mixer assembly (3), wherein the mixer assembly (3) is located between the first aftertreatment carrier (21) and the second aftertreatment carrier (22). The mixer assembly (3) comprises a mixing pipe (31) and a baffle plate (32) cooperating with the mixing pipe (31). The baffle plate (32) divides the casing into a first space (321) in communication with the first aftertreatment carrier (21) and a second space (322) in communication with the second aftertreatment carrier (22). The mixing pipe (31) comprises a first pipe portion (311) located within the first space (321) and a second pipe portion (312) located within the second space (322), wherein the first pipe portion (311) is provided with several swirl plates (3111), and the second pipe portion (312) is provided with a first opening (3121) and a second opening (3122) respectively located at two sides and used for forming dual swirls. With a secondary swirl formed by the tail gas aftertreatment device, the distance and the time for urea evaporation are increased, air mixing uniformity is improved, and the risk of urea crystallization is reduced.

Description

尾气后处理装置Exhaust aftertreatment device

本申请要求了申请日为2016年7月8日、申请号为201620718848.2、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。The present application claims priority to Chinese Patent Application Serial No. No. No. No. No. No. No. No. No. No.

技术领域Technical field

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。The invention relates to an exhaust gas aftertreatment device, and belongs to the technical field of engine exhaust aftertreatment.

背景技术Background technique

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。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，严重时会堵塞尾气管、导致发动机动力性能下降。Studies have shown that 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. 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 tail gas pipe when severe, resulting in a decrease in engine power performance.

现有技术中混合管与双层管的组合能够较好的提高尿素液滴与尾气的混合效果。但是，受限于空间，往往难以对混合管进行优化设计，从而应用范围受到一定程度的限制。In the prior art, the combination of the mixing tube and the double tube can better improve the mixing effect of the urea droplets and the exhaust gas. However, limited by space, it is often difficult to optimize the design of the mixing tube, so that the application range is limited to a certain extent.

因此，有必要提供一种新型的尾气后处理装置，以解决上述技术问题。Therefore, it is necessary to provide a novel exhaust gas aftertreatment device to solve the above technical problems.

发明内容Summary of the invention

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。It is an object of the present invention to provide an exhaust gas aftertreatment device which has a better mixing effect.

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，其包括壳体、位于所述壳体内的第一后处理载体、位于所述壳体内的第二后处理载体以及安装于所述壳体内的混合器组件，其中所述第一后处理载体位于所述第二后处理载体的上游，所述混合器组件位于所述第一后处理载体与所述第二后处理载体之间；所述混合器组件包括混合管以及与所述混合管相配合的隔板，所述隔板将所述壳体分隔成与所述第一后处理载体相连通的第一空间以及与所述第二后处理载体相连通的第二空间，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若干旋流片，所述第二管部设有分别位于两侧且用以形成双旋流的第一开口以及第二开口。 In order to achieve the above object, the present invention adopts the following technical solution: an exhaust gas after-treatment device comprising a casing, a first post-processing carrier located in the casing, a second post-processing carrier located in the casing, and being installed on a mixer assembly in the housing, wherein the first post-treatment carrier is located upstream of the second post-treatment carrier, the mixer assembly being located in the first post-treatment carrier and the second post-treatment carrier The mixer assembly includes a mixing tube and a partition cooperating with the mixing tube, the partition separating the housing into a first space in communication with the first post-treatment carrier and a second space in which the second post-treatment carrier communicates, the mixing tube including a first tube portion located in the first space and a second tube portion located in the second space, wherein the first tube The portion is provided with a plurality of swirling fins, and the second tubular portion is provided with a first opening and a second opening respectively located on both sides to form a double swirling flow.

作为本发明进一步改进的技术方案，所述隔板包括位于所述混合管一侧的第一板片、位于所述混合管另一侧的第二板片以及连接所述第一板片与所述第二板片的第三板片，所述第三板片设有供所述混合管穿过的通孔。As a further improved technical solution of the present invention, the partition plate comprises a first plate on one side of the mixing tube, a second plate on the other side of the mixing tube, and a connection between the first plate and the A third plate of the second plate is provided, and the third plate is provided with a through hole through which the mixing tube passes.

作为本发明进一步改进的技术方案，所述隔板呈S形。As a further improved technical solution of the present invention, the separator has an S shape.

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。As a further improved technical solution of the present invention, the mixer assembly includes a bowl cover at the bottom of the mixing tube.

作为本发明进一步改进的技术方案，所述第一开口以及所述第二开口均向下贯穿所述第二管部，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。As a further improvement of the technical solution of the present invention, the first opening and the second opening each extend downward through the second tube portion, and the bowl cover is fixed at a lower end of the second tube portion, the bowl cover An arcuate projection extending into the second tube portion is provided.

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。As a further improved technical solution of the present invention, the exhaust gas aftertreatment device is provided with a nozzle mount for mounting a urea nozzle to spray the atomized urea solution into the mixing tube.

作为本发明进一步改进的技术方案，所述混合管的第一管部包括位于所述旋流片的上方且靠近所述喷嘴安装座的若干穿孔，所述穿孔与所述第一空间相连通。As a further improved technical solution of the present invention, the first tube portion of the mixing tube includes a plurality of perforations located above the swirling sheet and adjacent to the nozzle mounting seat, the perforations being in communication with the first space.

作为本发明进一步改进的技术方案，所述第一开口以及所述第二开口均呈矩形。As a further improvement of the technical solution of the present invention, the first opening and the second opening are both rectangular.

作为本发明进一步改进的技术方案，所述第一后处理载体与所述第二后处理载体沿轴向相互对齐。As a further improved technical solution of the present invention, the first post-processing carrier and the second post-processing carrier are axially aligned with each other.

作为本发明进一步改进的技术方案，所述混合管垂直于所述壳体。As a further improved technical solution of the present invention, the mixing tube is perpendicular to the housing.

相较于现有技术，本发明通过形成二次旋流，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。Compared with the prior art, the present invention increases the distance and time of urea evaporation by forming a secondary swirling flow, improves the uniformity of gas flow mixing, and reduces the risk of urea crystallization.

附图说明DRAWINGS

图1是本发明尾气后处理装置的立体示意图。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of an exhaust gas aftertreatment device of the present invention.

图2是图1的部分立体分解图。Fig. 2 is a partially exploded perspective view of Fig. 1;

图3是图2中进一步的立体分解图。Figure 3 is a further exploded perspective view of Figure 2.

图4是图3中混合器组件以及喷嘴安装座的立体分解图。4 is an exploded perspective view of the mixer assembly and nozzle mount of FIG. 3.

图5是图4另一角度的立体分解图。Figure 5 is an exploded perspective view of another angle of Figure 4.

图6是沿图1中A-A线的剖面示意图。Figure 6 is a cross-sectional view taken along line A-A of Figure 1.

图7是沿图1中B-B线的剖面示意图。Figure 7 is a cross-sectional view taken along line B-B of Figure 1.

具体实施方式 detailed description

请参图1至图7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包括壳体1、位于所述壳体1内的第一后处理载体21、位于所述壳体1内的第二后处理载体22以及安装于所述壳体1内的混合器组件3。其中，所述第一后处理载体21位于所述第二后处理载体22的上游，所述混合器组件3位于所述第一后处理载体21与所述第二后处理载体22之间。在本发明图示的实施方式中，所述第一后处理载体21与所述第二后处理载体22沿轴向相互对齐。Referring to Figures 1 through 7, the present invention discloses an exhaust aftertreatment device 100 for treating the exhaust of an engine. The exhaust aftertreatment device 100 includes a housing 1 , a first post-processing carrier 21 located in the housing 1 , a second post-processing carrier 22 located in the housing 1 , and a housing 1 mounted therein Mixer component 3. The first post-processing carrier 21 is located upstream of the second post-processing carrier 22, and the mixer assembly 3 is located between the first post-processing carrier 21 and the second post-processing carrier 22. In the illustrated embodiment of the invention, the first aftertreatment carrier 21 and the second aftertreatment carrier 22 are axially aligned with one another.

所述混合器组件3包括混合管31、与所述混合管31相配合的隔板32以及位于所述混合管31底部的碗盖33。在本发明图示的实施方式中，所述混合管31垂直于所述壳体1。所述尾气后处理装置100设有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31内的喷嘴安装座11。The mixer assembly 3 includes a mixing tube 31, a partition 32 that cooperates with the mixing tube 31, and a bowl lid 33 at the bottom of the mixing tube 31. In the illustrated embodiment of the invention, the mixing tube 31 is perpendicular to the housing 1. The exhaust gas after-treatment device 100 is provided with a nozzle mount 11 for mounting a urea nozzle to inject a urea solution after atomization into the mixing tube 31.

所述隔板32呈S形，其将所述壳体1分隔成与所述第一后处理载体21相连通的第一空间321以及与所述第二后处理载体22相连通的第二空间322。所述隔板32包括位于所述混合管31一侧的第一板片323、位于所述混合管31另一侧的第二板片324以及连接所述第一板片323与所述第二板片324的第三板片325，所述第三板片325设有供所述混合管31穿过的通孔326。当然，在其他实施方式中，所述第一板片323及/或所述第二板片324也可以设置若干穿孔，以调整背压。The partition 32 is S-shaped, which partitions the casing 1 into a first space 321 that communicates with the first after-treatment carrier 21 and a second space that communicates with the second after-treatment carrier 22 322. The partition plate 32 includes a first plate 323 on one side of the mixing tube 31, a second plate 324 on the other side of the mixing tube 31, and a connection between the first plate 323 and the second A third plate 325 of the plate 324, the third plate 325 is provided with a through hole 326 through which the mixing tube 31 passes. Of course, in other embodiments, the first plate 323 and/or the second plate 324 may also be provided with a plurality of perforations to adjust the back pressure.

所述混合管31包括位于所述第一空间321内的第一管部311以及位于所述第二空间322内的第二管部312。其中，所述第一管部311设有若干旋流片3111以及位于所述旋流片3111的上方且靠近所述喷嘴安装座11的若干穿孔3112。所述穿孔3112与所述第一空间321相连通。The mixing tube 31 includes a first tube portion 311 located in the first space 321 and a second tube portion 312 located in the second space 322. The first tube portion 311 is provided with a plurality of swirling fins 3111 and a plurality of perforations 3112 located above the swirling fins 3111 and adjacent to the nozzle mounting seat 11. The through hole 3112 is in communication with the first space 321 .

所述第二管部312设有分别位于两侧且用以形成双旋流的第一开口3121以及第二开口3122。在本发明图示的实施方式中，所述第一开口3121以及所述第二开口3122均向下贯穿所述第二管部312。所述第一开口3121以及所述第二开口3122均呈矩形。The second tube portion 312 is provided with a first opening 3121 and a second opening 3122 which are respectively located on both sides and are used to form a double swirl. In the illustrated embodiment of the present invention, the first opening 3121 and the second opening 3122 each extend downward through the second tube portion 312. The first opening 3121 and the second opening 3122 are each rectangular.

所述碗盖33固定在所述第二管部312的下端，所述碗盖33设有向所述第二管部312内延伸的圆弧形凸起331，以导引气流反向流动以穿过所述第一开口3121以及所述第二开口3122。所述碗盖33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。The bowl cover 33 is fixed to the lower end of the second tube portion 312, and the bowl cover 33 is provided with a circular arc-shaped protrusion 331 extending into the second tube portion 312 to guide the reverse flow of the airflow. Through the first opening 3121 and the second opening 3122. The bowl lid 33 prevents the urea solution from being directly sprayed onto the exhaust pipe, thereby reducing the risk of urea crystallization.

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21进入到第一空间321内时，绝大部分的尾气在旋流片3111的导引下旋转进入混合管31，少量的尾气自穿孔3112进入混合管31。当满足喷射条件时，尿素喷嘴向混合管31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旋转。请参图7中的螺旋线箭头所示，随后，在碗盖33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一开口3121以及第二开口3122，以形成双旋流。随后，气流进入到第二空间322内，并到达位于下游的第二后处理载体22。如此设置，通过形成二次旋流，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。In the illustrated embodiment of the present invention, when the exhaust gas of the engine passes through the first after-treatment carrier 21 into the first space 321, most of the exhaust gas is rotated under the guidance of the swirling plate 3111 into the mixing tube 31. A small amount of exhaust gas enters the mixing tube 31 from the perforation 3112. When the injection condition is satisfied, the urea nozzle injects urea into the mixing tube 31, the atomized urea droplets and the engine The exhaust gases are mixed together and rotated downstream. Referring to the spiral arrow in FIG. 7, then, under the blockage of the bowl cover 33, the airflow is better reversed (for example, upstream); the airflow after the reverse direction passes through the first opening 3121 and the second opening. 3122 to form a double swirl. The gas stream then enters the second space 322 and reaches the second post-treatment carrier 22 located downstream. In this way, by forming a secondary swirling flow, 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.

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。 In addition, the above embodiments are only for illustrating the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of the present specification should be based on those skilled in the art, although the present specification has been carried out with reference to the above embodiments. DETAILED DESCRIPTION OF THE INVENTION However, those skilled in the art should understand that the invention may be modified or equivalently replaced by those skilled in the art without departing from the spirit and scope of the invention. It is intended to be included within the scope of the appended claims.

Claims (10)

一种尾气后处理装置，其包括壳体、位于所述壳体内的第一后处理载体、位于所述壳体内的第二后处理载体以及安装于所述壳体内的混合器组件，其中所述第一后处理载体位于所述第二后处理载体的上游，所述混合器组件位于所述第一后处理载体与所述第二后处理载体之间；其特征在于：所述混合器组件包括混合管以及与所述混合管相配合的隔板，所述隔板将所述壳体分隔成与所述第一后处理载体相连通的第一空间以及与所述第二后处理载体相连通的第二空间，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若干旋流片，所述第二管部设有分别位于两侧且用以形成双旋流的第一开口以及第二开口。An exhaust aftertreatment device comprising a housing, a first post-processing carrier located within the housing, a second post-processing carrier located within the housing, and a mixer assembly mounted within the housing, wherein a first post-treatment carrier located upstream of the second post-treatment carrier, the mixer assembly being located between the first post-treatment carrier and the second post-treatment carrier; characterized in that the mixer assembly comprises a mixing tube and a partition cooperating with the mixing tube, the partition separating the housing into a first space in communication with the first post-treatment carrier and in communication with the second post-processing carrier a second space, the mixing tube includes a first tube portion located in the first space and a second tube portion located in the second space, wherein the first tube portion is provided with a plurality of swirling sheets The second tube portion is provided with a first opening and a second opening respectively located on both sides and used to form a double swirl. 如权利要求1所述的尾气后处理装置，其特征在于：所述隔板包括位于所述混合管一侧的第一板片、位于所述混合管另一侧的第二板片以及连接所述第一板片与所述第二板片的第三板片，所述第三板片设有供所述混合管穿过的通孔。The exhaust gas aftertreatment device according to claim 1, wherein said partition plate comprises a first plate on one side of said mixing pipe, a second plate on the other side of said mixing pipe, and a joint The first plate and the third plate of the second plate are provided, and the third plate is provided with a through hole through which the mixing tube passes. 如权利要求2所述的尾气后处理装置，其特征在于：所述隔板呈S形。The exhaust gas aftertreatment device according to claim 2, wherein the separator has an S shape. 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。The exhaust aftertreatment device of claim 1 wherein said mixer assembly includes a bowl cover at the bottom of said mixing tube. 如权利要求4所述的尾气后处理装置，其特征在于：所述第一开口以及所述第二开口均向下贯穿所述第二管部，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。The exhaust gas after-treatment device according to claim 4, wherein the first opening and the second opening both extend downward through the second pipe portion, and the bowl cover is fixed to the second pipe portion At the lower end, the bowl cover is provided with a circular arc-shaped projection extending into the second tube portion. 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。The exhaust gas aftertreatment device according to claim 1, wherein said exhaust gas aftertreatment device is provided with a nozzle mount for mounting a urea nozzle to inject a urea solution after atomization into said mixing tube. 如权利要求6所述的尾气后处理装置，其特征在于：所述混合管的第一管部包括位于所述旋流片的上方且靠近所述喷嘴安装座的若干穿孔，所述穿孔与所述第一空间相连通。The exhaust gas aftertreatment device according to claim 6, wherein the first tube portion of the mixing tube comprises a plurality of perforations located above the swirling sheet and adjacent to the nozzle mounting seat, the perforation and the The first space is connected. 如权利要求1所述的尾气后处理装置，其特征在于：所述第一开口以及所述第二开口均呈矩形。The exhaust aftertreatment device of claim 1 wherein said first opening and said second opening are each rectangular. 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与所述第二后处 理载体沿轴向相互对齐。The exhaust aftertreatment device according to claim 1, wherein said first post-processing carrier and said second rear portion The carriers are aligned with each other in the axial direction. 如权利要求9所述的尾气后处理装置，其特征在于：所述混合管垂直于所述壳体。 The exhaust aftertreatment device of claim 9 wherein said mixing tube is perpendicular to said housing.
PCT/CN2017/089980 2016-07-08 2017-06-26 Tail gas aftertreatment device Ceased WO2018006718A1 (en)

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