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WO2018006720A1 - 混合组件 - Google Patents

混合组件 Download PDF

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Publication number
WO2018006720A1
WO2018006720A1 PCT/CN2017/089983 CN2017089983W WO2018006720A1 WO 2018006720 A1 WO2018006720 A1 WO 2018006720A1 CN 2017089983 W CN2017089983 W CN 2017089983W WO 2018006720 A1 WO2018006720 A1 WO 2018006720A1
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WO
WIPO (PCT)
Prior art keywords
mixing
shroud
partition
tube
mixing tube
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Application number
PCT/CN2017/089983
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English (en)
French (fr)
Inventor
郑祥
殷雷
王林
吴健
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 WO2018006720A1 publication Critical patent/WO2018006720A1/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

Definitions

  • the invention relates to a mixing component 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
  • a mixing assembly comprising a housing, a plurality of partitions mounted in the housing, and a mixing device at least partially located in the housing, wherein the plurality of partitions The first partition and the second partition are disposed at intervals; the first partition and the second partition partition the casing into a first cavity located upstream of the first partition, located at a second cavity between the first baffle and the second baffle and a third cavity downstream of the second baffle, the mixing device being at least partially supported by the first baffle
  • the second baffle includes at least one through hole communicating the second cavity and the third cavity;
  • the mixing device includes a first mixing tube and a second mixing parallel to the first mixing tube a tube, wherein the first mixing tube includes a first outer surface and a plurality of first swirl sheets on the first outer surface, the second mixing tube including a second outer surface and the second outer surface a plurality of second swirl sheets, wherein the first swirl sheet The second swirling sheet is located in the first cavity, and the mixing
  • the mixing assembly includes a first nozzle mount for mounting a urea nozzle to inject a urea solution after atomization into the first mixing tube, and a urea nozzle for mounting The urea solution after atomization is sprayed into the second nozzle mount in the second mixing tube.
  • the first mixing tube and the first shroud are axially spaced apart from each other, and the first shroud is provided with a first opening facing the first mixing tube And an arc-shaped first inner surface for changing the flow direction of the airflow.
  • the second mixing tube and the second shroud are axially spaced apart from each other, and the second shroud is provided with a second opening facing the second mixing tube And an arc-shaped second inner surface for changing the flow direction of the airflow.
  • the first mixing tube includes a plurality of first perforations on one side of the first swirling sheet and adjacent to the first nozzle mounting seat
  • the second mixing tube includes One side of the second swirling sheet is adjacent to the plurality of second through holes of the second nozzle mounting seat, and the first through hole and the second through hole are both in communication with the first cavity.
  • the first mixing tube includes a first extension extending beyond the first partition to enter the second cavity, and the first extension does not extend into the first In the shroud;
  • the second mixing tube includes a second extension extending beyond the first partition to enter the second cavity, the second extension not extending into the second shroud .
  • the diameter of the first opening is larger than the diameter of the first extension
  • the diameter of the second opening is larger than the diameter of the second extension
  • the first shroud and the second shroud are at least partially protruded into the third cavity.
  • the mixing assembly further includes a partition plate located in the first cavity and located between the first mixing tube and the second mixing tube.
  • the present invention increases the distance and time of urea evaporation by providing two mixing tubes and two shrouds, and improves the uniformity of airflow mixing.
  • Figure 1 is a perspective view of a mixing assembly of the present invention.
  • Figure 2 is a perspective perspective view of Figure 1.
  • Figure 3 is a partial exploded perspective view of Figure 1.
  • Figure 4 is a cross-sectional view taken along line A-A of Figure 1.
  • the present invention discloses a mixing assembly 100 for treating exhaust gases from an engine, such as a high power engine.
  • the mixing assembly 100 comprises a housing 1, a plurality of partitions 2 mounted in the housing 1, and a mixing device 3 at least partially located within the housing.
  • the plurality of partitions 2 include a first partition 21 and a second partition 22 which are spaced apart from each other.
  • the first partition plate 21 and the second partition plate 22 divide the casing 1 into a first cavity 41 located upstream of the first partition plate 21, and located at the first partition plate 21 and A second cavity 42 between the second separators 22 and a third cavity 43 located downstream of the second separators 22 are described.
  • the mixing device 3 is at least partially supported by the first partition 21 .
  • the housing 1 has a cylindrical shape and includes an end cap 11 and an inlet tube 12 fixed to the end cap 11, the inlet tube 12 being in communication with the first cavity 41.
  • the mixing device 3 includes a first mixing tube 31 and a second mixing tube 32 that is parallel to the first mixing tube 31.
  • the first mixing tube 31 and the second mixing tube 32 have the same structure.
  • the mixing assembly 100 includes a first nozzle mount 33 for mounting a urea nozzle (not shown) to inject a urea solution after atomization into the first mixing tube 31, and a urea nozzle for mounting The urea solution after atomization is sprayed into the second nozzle mount 34 in the second mixing tube 32.
  • both the first nozzle mount 33 and the second nozzle mount 34 are exposed on the end cap 11.
  • the first mixing tube 31 includes a first outer surface 311, a plurality of first swirling sheets 312 on the first outer surface 311, and a side of the first swirling sheet 312 and adjacent to the first A plurality of first perforations 313 of the nozzle mount 33.
  • the second mixing tube 32 includes a second outer surface 321 , a plurality of second swirl sheets 322 on the second outer surface 321 , and one side of the second swirl sheet 322 and adjacent to the second A plurality of second perforations 323 of the nozzle mount 34.
  • the first swirling sheet 312 and the second swirling sheet 322 are both located in the first cavity 41, and the mixing assembly 100 further includes a second spacer 22 fixed on the second partition 22 a first shroud 35 aligned with the mixing tube 31 and a second shroud 36 fixed to the second partition 22 and aligned with the second mixing tube 32, the first shroud 35 and The second shroud 36 is used to force the airflow to flow in the opposite direction.
  • the first through hole 313 and the second through hole 323 are both in communication with the first cavity 41.
  • the second partition 22 includes at least one through hole 221 that communicates the second cavity 42 and the third cavity 43.
  • the first mixing tube 31 includes a first extension 314 that extends beyond the first diaphragm 21 to enter the second cavity 42; the second mixing tube 32 includes an extension that extends beyond the first The partition 21 enters the second extension 324 in the second cavity 42.
  • the first mixing tube 31 and the first shroud 35 are axially spaced apart from each other, and the first extending portion 314 does not extend into the first shroud 35.
  • the second mixing tube 32 and the second shroud 36 are axially spaced apart from each other, and the second extending portion 324 does not extend into the second shroud 36.
  • the first shroud 35 is identical in construction to the second shroud 36.
  • the first shroud 35 is provided with a first opening 351 facing the first mixing tube 31 and an arc-shaped first inner surface 352 for changing the flow direction of the airflow;
  • the second shroud 36 is provided with a second opening 361 facing the second mixing tube 32 and a second inner surface 362 of an arc shape for changing the flow direction of the airflow.
  • the first opening 351 and the second opening 361 are both in communication with the second cavity 42.
  • the diameter of the first opening 351 is larger than the diameter of the first extension portion 314, and the diameter of the second opening 361 is larger than the diameter of the second extension portion 324 to ensure that more airflow can be in the corresponding first
  • the shroud 35 or the second shroud 36 flows in the opposite direction.
  • the first shroud 35 and the second shroud 36 protrude at least partially into the third cavity 43.
  • the mixing assembly 100 further includes a partitioning plate 13 located within the first cavity 41 between the first mixing tube 31 and the second mixing tube 32.
  • the exhaust of the engine enters the first cavity 41 from the inlet pipe 12; subsequently, most of the exhaust gas forms a spiral airflow under the guidance of the first swirling plate 312 and the second swirling plate 322, and respectively
  • the first mixing tube 31 and the second mixing tube 32 are entered.
  • the urea nozzle sprays the atomized urea solution into the first mixing tube 31 and the second mixing tube 32, and the urea droplets are mixed with the exhaust gas by the spiral air flow.
  • a portion of the airflow from the first and second mixing tubes 31, 32 will rush toward the corresponding first and second shrouds 35, 36, and then reversed by the first and second inner surfaces 352, 362. .
  • the distance and time of urea evaporation are increased, the uniformity of airflow mixing is improved, and on the other hand, the risk of crystallization due to contact of the urea solution with the pipe wall is reduced.
  • the mixing uniformity can be improved by providing two mixing tubes, for example to match a high power engine. It can be understood that in other embodiments, the number of mixing tubes can also be increased according to different design requirements.

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

Abstract

一种混合组件（100），包括壳体（1）、若干隔板（2）以及混合装置（3），其中若干隔板（2）包括间隔设置的第一隔板（21）与第二隔板（22）；第一隔板（21）与第二隔板（22）将壳体（1）分隔成第一腔体（41）、第二腔体（42）以及第三腔体（43）。混合装置（3）至少部分被第一隔板（21）支撑。混合装置（3）包括第一混合管（31）以及与第一混合管（31）平行的第二混合管（32），其中第一混合管（31）包括若干第一旋流片（312），第二混合管（32）包括若干第二旋流片（322），其中第一旋流片（312）与第二旋流片（322）均位于第一腔体（41）内。混合组件（100）还包括固定在第二隔板（22）上的第一导流罩（35）以及第二导流罩（36），用以迫使气流反向流动。该混合组件（100）增加了尿素蒸发的距离和时间，提高了气流混合的均匀性。

Description

混合组件
本申请要求了申请日为2016年7月4日、申请号为201620692384.2、发明名称为“混合组件”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
本发明涉及一种混合组件，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混合组件，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的混合组件。
为实现上述目的，本发明采用如下技术方案：一种混合组件，其包括壳体、安装于所述壳体内的若干隔板以及至少部分位于所述壳体内的混合装置，其中所述若干隔板包括间隔设置的第一隔板与第二隔板；所述第一隔板与所述第二隔板将所述壳体分隔成位于所述第一隔板的上游的第一腔体、位于所述第一隔板与所述第二隔板之间的第二腔体以及位于所述第二隔板的下游的第三腔体，所述混合装置至少部分被所述第一隔板支撑，所述第二隔板包括连通所述第二腔体与所述第三腔体的至少一个通孔；所述混合装置包括第一混合管以及与所述第一混合管平行的第二混合管，其中所述第一混合管包括第一外表面以及位于所述第一外表面上的若干第一旋流片，所述第二混合管包括第二外表面以及位于所述第二外表面上的若干第二旋流片，其中所述第一旋流片与所述第二旋流片均位于所述第一腔体内，所述混合组件还包括固定在所述第二隔板上且与所述第一混合管对齐的第一导流罩以及固定在所述第二隔板上且与所述第二混合管对齐的第二导流罩， 所述第一导流罩与所述第二导流罩用以迫使气流反向流动。
作为本发明进一步改进的技术方案，所述混合组件包括用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述第一混合管内的第一喷嘴安装座，以及用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述第二混合管内的第二喷嘴安装座。
作为本发明进一步改进的技术方案，所述第一混合管与所述第一导流罩在轴向上相互间隔，所述第一导流罩设有面向所述第一混合管的第一开口以及用以改变气流流动方向的圆弧状的第一内表面。
作为本发明进一步改进的技术方案，所述第二混合管与所述第二导流罩在轴向上相互间隔，所述第二导流罩设有面向所述第二混合管的第二开口以及用以改变气流流动方向的圆弧状的第二内表面。
作为本发明进一步改进的技术方案，所述第一混合管包括位于所述第一旋流片的一侧且靠近所述第一喷嘴安装座的若干第一穿孔，所述第二混合管包括位于所述第二旋流片的一侧且靠近所述第二喷嘴安装座的若干第二穿孔，所述第一穿孔与所述第二穿孔均与所述第一腔体相连通。
作为本发明进一步改进的技术方案，所述第一混合管包括延伸超过所述第一隔板以进入所述第二腔体内第一延伸部，所述第一延伸部未延伸入所述第一导流罩中；所述第二混合管包括延伸超过所述第一隔板以进入所述第二腔体内第二延伸部，所述第二延伸部未延伸入所述第二导流罩中。
作为本发明进一步改进的技术方案，所述第一开口的直径大于所述第一延伸部的直径，所述第二开口的直径大于所述第二延伸部的直径。
作为本发明进一步改进的技术方案，所述第一导流罩与所述第二导流罩均至少部分凸伸入所述第三腔体内。
作为本发明进一步改进的技术方案，所述混合组件还包括位于所述第一腔体内且位于所述第一混合管与所述第二混合管之间的分隔板。
相较于现有技术，本发明通过设置两个混合管以及两个导流罩，增加了尿素蒸发的距离和时间，提高了气流混合的均匀性。
附图说明
图1是本发明混合组件的立体示意图。
图2是图1的立体透视图。
图3是图1的部分立体分解图。
图4是图1中A-A线的剖面图。
具体实施方式
请参图1至图4所示，本发明揭示了一种混合组件100，用以处理发动机(例如大功率发动机)的排气。整体上，所述混合组件100包括壳体1、安装于所述壳体1内的若干隔板2以及至少部分位于所述壳体内的混合装置3。其中所述若干隔板2包括间隔设置的第一隔板21与第二隔板22。所述第一隔板21与所述第二隔板22将所述壳体1分隔成位于所述第一隔板21的上游的第一腔体41、位于所述第一隔板21与所述第二隔板22之间的第二腔体42以及位于所述第二隔板22的下游的第三腔体43。所述混合装置3至少部分被所述第一隔板21支撑。
所述壳体1呈圆柱形，其包括端盖11以及固定在所述端盖11上的入口管12，所述入口管12与所述第一腔体41相连通。
所述混合装置3包括第一混合管31以及与所述第一混合管31平行的第二混合管32。在本发明图示的实施方式中，所述第一混合管31与所述第二混合管32的结构相同。所述混合组件100包括用以安装尿素喷嘴(未图示)以将雾化之后的尿素溶液喷入所述第一混合管31内的第一喷嘴安装座33，以及用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述第二混合管32内的第二喷嘴安装座34。在本发明图示的实施方式中，所述第一喷嘴安装座33与所述第二喷嘴安装座34均暴露在所述端盖11上。所述第一混合管31包括第一外表面311、位于所述第一外表面311上的若干第一旋流片312以及位于所述第一旋流片312的一侧且靠近所述第一喷嘴安装座33的若干第一穿孔313。所述第二混合管32包括第二外表面321、位于所述第二外表面321上的若干第二旋流片322以及位于所述第二旋流片322的一侧且靠近所述第二喷嘴安装座34的若干第二穿孔323。所述第一旋流片312与所述第二旋流片322均位于所述第一腔体41内，所述混合组件100还包括固定在所述第二隔板22上且与所述第一混合管31对齐的第一导流罩35以及固定在所述第二隔板22上且与所述第二混合管32对齐的第二导流罩36，所述第一导流罩35与所述第二导流罩36用以迫使气流反向流动。所述第一穿孔313与所述第二穿孔323均与所述第一腔体41相连通。所述第二隔板22包括连通所述第二腔体42与所述第三腔体43的至少一个通孔221。
另外，所述第一混合管31包括延伸超过所述第一隔板21以进入所述第二腔体42内的第一延伸部314；所述第二混合管32包括延伸超过所述第一隔板21以进入所述第二腔体42内的第二延伸部324。所述第一混合管31与所述第一导流罩35在轴向上相互间隔，所述第一延伸部314未延伸入所述第一导流罩35中。所述第二混合管32与所述第二导流罩36在轴向上相互间隔，所述第二延伸部324未延伸入所述第二导流罩36中。在本发明图示的实施方式中，所述第一导流罩35与所述第二导流罩36结构相同。其中，所述第一导流罩35设有面向所述第一混合管31的第一开口351以及用以改变气流流动方向的圆弧状的第一内表面352；所述第二导流罩36设有面向所述第二混合管32的第二开口361以及用以改变气流流动方向的圆弧状的第二内表面362。所述第一开口351与所述第二开口361均与所述第二腔体42连通。所述第一开口351的直径大于所述第一延伸部314的直径，所述第二开口361的直径大于所述第二延伸部324的直径，以确保较多的气流能够在对应的第一导流罩35或第二导流罩36的作用下反向流动。所述第一导流罩35与第二导流罩36至少部分凸伸入所述第三腔体43内。
另外，所述混合组件100还包括位于所述第一腔体41内且位于所述第一混合管31与所述第二混合管32之间的分隔板13。
使用时，发动机的排气自入口管12进入第一腔体41；随后，绝大部分排气在第一旋流片312、第二旋流片322的引导下形成螺旋状的气流，并分别进入第一混合管31、第二混合管32。当达到喷射条件时，尿素喷嘴向所述第一混合管31、第二混合管32中喷射雾化的尿素溶液，尿素液滴在螺旋状气流的作用下与排气进行混合。从第一、第二混合管31、32出来的气流一部分会冲向对应的第一、第二导流罩35、36，然后在第一、第二内表面352、362的作用下进行反向。如此设置，一方面增加了尿素蒸发的距离和时间，提高了气流混合的均匀性；另一方面降低了因尿素溶液与管壁接触而产生结晶的风险。
在本发明图示的实施方式中，在用以例如与大功率发动机相匹配的情况下，通过设置两个混合管，可以改善混合的均匀性。可以理解，在其他实施方式中，根据不同的设计要求，还可以增加混合管的数量。
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 (9)

  1. 一种混合组件，其包括壳体、安装于所述壳体内的若干隔板以及至少部分位于所述壳体内的混合装置，其中所述若干隔板包括间隔设置的第一隔板与第二隔板；所述第一隔板与所述第二隔板将所述壳体分隔成位于所述第一隔板的上游的第一腔体、位于所述第一隔板与所述第二隔板之间的第二腔体以及位于所述第二隔板的下游的第三腔体，所述混合装置至少部分被所述第一隔板支撑，所述第二隔板包括连通所述第二腔体与所述第三腔体的至少一个通孔；其特征在于：所述混合装置包括第一混合管以及与所述第一混合管平行的第二混合管，其中所述第一混合管包括第一外表面以及位于所述第一外表面上的若干第一旋流片，所述第二混合管包括第二外表面以及位于所述第二外表面上的若干第二旋流片，其中所述第一旋流片与所述第二旋流片均位于所述第一腔体内，所述混合组件还包括固定在所述第二隔板上且与所述第一混合管对齐的第一导流罩以及固定在所述第二隔板上且与所述第二混合管对齐的第二导流罩，所述第一导流罩与所述第二导流罩用以迫使气流反向流动。
  2. 如权利要求1所述的混合组件，其特征在于：所述混合组件包括用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述第一混合管内的第一喷嘴安装座，以及用以安装尿素喷嘴以将雾化之后的尿素溶液喷入所述第二混合管内的第二喷嘴安装座。
  3. 如权利要求1所述的混合组件，其特征在于：所述第一混合管与所述第一导流罩在轴向上相互间隔，所述第一导流罩设有面向所述第一混合管的第一开口以及用以改变气流流动方向的圆弧状的第一内表面。
  4. 如权利要求3所述的混合组件，其特征在于：所述第二混合管与所述第二导流罩在轴向上相互间隔，所述第二导流罩设有面向所述第二混合管的第二开口以及用以改变气流流动方向的圆弧状的第二内表面。
  5. 如权利要求2所述的混合组件，其特征在于：所述第一混合管包括位于所述第一旋流片的一侧且靠近所述第一喷嘴安装座的若干第一穿孔，所述第二混合管包括位于所述第二旋流片的一侧且靠近所述第二喷嘴安装座的若干第二穿孔，所述第一穿孔与所述第二穿孔均与所述第一腔体相连通。
  6. 如权利要求4所述的混合组件，其特征在于：所述第一混合管包括延伸超过所述第一隔板以进入所述第二腔体内第一延伸部，所述第一延伸部未延伸入所述第一导流罩中；所述第二混合管包括延伸超过所述第一隔板以进入所述第二腔体内第二延伸部，所述第二延伸部未延伸入所述第二导流罩中。
  7. 如权利要求6所述的混合组件，其特征在于：所述第一开口的直径大于所述第一延伸部的直径，所述第二开口的直径大于所述第二延伸部的直径。
  8. 如权利要求1所述的混合组件，其特征在于：所述第一导流罩与所述第二导流罩均至少部分凸伸入所述第三腔体内。
  9. 如权利要求1至8项中任意一项所述的混合组件，其特征在于：所述混合组件还包括位于所述第一腔体内且位于所述第一混合管与所述第二混合管之间的分隔板。
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CN205779177U (zh) * 2016-07-04 2016-12-07 天纳克（苏州）排放系统有限公司 混合组件
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