WO2017215461A1 - 尾气后处理装置 - Google Patents

尾气后处理装置 Download PDF

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Publication number
WO2017215461A1
WO2017215461A1 PCT/CN2017/086995 CN2017086995W WO2017215461A1 WO 2017215461 A1 WO2017215461 A1 WO 2017215461A1 CN 2017086995 W CN2017086995 W CN 2017086995W WO 2017215461 A1 WO2017215461 A1 WO 2017215461A1
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Prior art keywords
mixing
mixing chamber
tube
housing
pipe
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PCT/CN2017/086995
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English (en)
French (fr)
Inventor
曹刚
王江华
王平
华滑辉
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天纳克（苏州）排放***有限公司
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Priority claimed from CN201610428578.6A external-priority patent/CN107514305B/zh
Application filed by 天纳克（苏州）排放***有限公司 filed Critical 天纳克（苏州）排放***有限公司
Publication of WO2017215461A1 publication Critical patent/WO2017215461A1/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
    • F01N3/24—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 aftertreatment device including a first mixing chamber assembly, a second mixing chamber assembly located downstream of the first mixing chamber assembly, and the second mixing a catalyst carrier assembly downstream of the chamber assembly
  • the first mixing chamber assembly including a first housing having a first mixing chamber, an inlet tube in communication with the first mixing chamber, and at least partially located within the first mixing chamber a first mixing tube, the first mixing tube is provided with a first tube body located in the first mixing chamber and a second tube body extending out of the first mixing chamber, wherein the first tube body
  • the side wall is provided with a plurality of swirling sheets;
  • the second mixing chamber assembly includes a second housing and a second mixing tube located in the second housing, the second mixing tube is disposed opposite to the first mixing
  • the tube is a shroud that forces the flow of gas to flow in the opposite direction, and the first housing and the second housing are spaced apart from each other.
  • the first housing is provided with a first flange
  • the first mixing chamber assembly is provided with a second flange fixed to the intake pipe, the first flange
  • the second flange is detachably coupled by bolts.
  • the intake pipe is arranged side by side and parallel to the first mixing pipe, and the intake pipe is provided with an intake cone, a porous pipe matched with the intake cone, and a perforated tube mating blind flange plate, the perforated tube being located in the first mixing chamber, the inlet cone being located on one side of the perforated tube, and the blind flange plate being located in the porous tube One side, wherein the inlet cone and the blind flange plate are detachably coupled to the first housing.
  • the first housing is provided with a mounting seat for mounting a urea nozzle to inject urea into the first mixing tube; a sidewall of the first tube body is disposed adjacent to the a plurality of openings of the swirl sheet, the openings being adjacent to the mount and in communication with the first mixing chamber.
  • the first mixing chamber assembly is provided with a third flange welded to the second tube body, and the second mixing chamber assembly is provided with the second housing.
  • the fourth flange the third flange and the fourth flange are detachably connected by bolts.
  • a first mixing space is disposed between the second pipe body and the second mixing pipe, and a second space is disposed between the second mixing pipe and the second casing. Mixed space.
  • the shroud has a bowl shape and is provided with a curved end wall.
  • the second mixing chamber assembly is provided with a first support plate supporting the second mixing tube, and the second mixing tube passes through the first support plate, the first A first gap for airflow therethrough is provided between the support plate and the inner wall of the second housing.
  • the second mixing chamber assembly is provided with a second support plate supporting the second mixing tube, and the second mixing tube passes through the second support plate, the first The support plate and the second support plate are parallel to each other, and a second gap through which the airflow passes is disposed between the second support plate and the inner wall of the second casing.
  • the catalyst carrier assembly includes a selective catalytic reducing agent, and the catalyst carrier assembly is detachably coupled to the second housing.
  • the present invention separates the first casing from the second casing, and the first pipe body of the first mixing pipe is disposed outside the second casing and passes through the first casing.
  • the body is shielded, so the structural design of the swirling sheet on the first pipe body can be flexibly adjusted according to design requirements, and the size limitation caused by the entire design of the first mixing pipe in a single casing is avoided in the prior art.
  • Figure 1 is a perspective view of a tail gas aftertreatment device of the present invention in a first embodiment.
  • Fig. 2 is a partially exploded perspective view of Fig. 1;
  • FIG. 3 is an exploded perspective view of a portion of the first mixing chamber assembly of FIG. 2.
  • Figure 4 is an exploded perspective view of another angle of Figure 3.
  • Figure 5 is a partial exploded perspective view of Figure 1 with the second mixing chamber assembly exploded.
  • Figure 6 is a further exploded perspective view of the second mixing chamber assembly of Figure 5.
  • Figure 7 is an exploded perspective view of another angle of Figure 6.
  • Figure 8 is a right side view of Figure 1.
  • Figure 9 is a schematic cross-sectional view taken along line A-A of Figure 8.
  • Figure 10 is a perspective view of the exhaust gas aftertreatment device of the present invention in a second embodiment.
  • Figure 11 is a partially exploded perspective view of Figure 10.
  • Figure 12 is an exploded perspective view of a portion of the first mixing chamber assembly of Figure 11.
  • Figure 13 is an exploded perspective view of another angle of Figure 12;
  • Figure 14 is a partial exploded perspective view of Figure 10 with the second mixing chamber assembly exploded.
  • Figure 15 is a right side view of Figure 10.
  • Figure 16 is a cross-sectional view taken along line B-B of Figure 15.
  • the present invention discloses an exhaust aftertreatment device 100 for treating the exhaust of an engine.
  • the exhaust aftertreatment device 100 includes a first mixing chamber assembly 1, a second mixing chamber assembly 2 downstream of the first mixing chamber assembly 1, and a catalyst carrier assembly 3 downstream of the second mixing chamber assembly 2.
  • the catalyst support assembly 3 comprises a selective catalytic reducing agent.
  • the first mixing chamber assembly 1 includes a first housing 11 provided with a first mixing chamber 10, an intake tube 12 in communication with the first mixing chamber 10, and a portion at least partially located within the first mixing chamber 10.
  • a mixing tube 13 In the first embodiment of the present invention, the first housing 11 is provided with a first flange 111, and the first mixing chamber assembly 1 is provided with a second flange 112 fixed to the intake pipe 12, The first flange 111 and the second flange 112 are detachably coupled together by bolts 113. In this way, the direction of the intake pipe 12 can be adjusted by adjusting the mounting direction to suit different installation requirements.
  • the said A housing 11 is provided with a mount 114 for mounting a urea nozzle (not shown) for injecting urea into the first mixing tube 13.
  • the first mixing tube 13 is provided with a first tube body 131 located in the first mixing chamber 10 and a second tube extending out of the first mixing chamber 10 .
  • a tubular body 132 wherein the side wall of the first tubular body 131 is provided with a plurality of swirling fins 1311 and a plurality of openings 1312 located at two sides of the swirling fins 1311 and adjacent to the swirling fins 1311.
  • the opening 1312 of the side is adjacent to the mounting seat 114 and is in communication with the first mixing chamber 10.
  • the first mixing tube 13 has a cylindrical shape, and the first housing 11 is provided with an arc-shaped upper surface 115 such that the upper surface 115 and the first surface A curved cavity is formed between the mixing tubes 13 to facilitate the formation of a swirl.
  • the first mixing chamber assembly 1 is also provided with a third flange 116 welded to the second tubular body 132.
  • the second mixing chamber assembly 2 includes a second housing 21 , a second mixing tube 23 located in the second housing 21 , and a second mixing tube for supporting The first support plate 24 and the second support plate 25 of 23.
  • the first support plate 24 and the second support plate 25 are parallel to each other.
  • the second mixing chamber assembly 2 is provided with a fourth flange 211 welded to the second housing 21.
  • the first housing 11 and the second housing 21 are spaced apart from each other, and the third flange 116 and the fourth flange 211 are detachably coupled together by bolts 212.
  • the swirling sheet 1311 on the first tube body 131 is provided.
  • the structural design (for example, the length of the swirling fin 1311, the opening density, etc.) can be flexibly adjusted according to the design requirements, avoiding the size limitation caused by the entire design of the first mixing tube 13 in a single housing in the prior art.
  • the hybrid structure on the first tubular body 131 can be independently designed to avoid being limited by the size of the entire casing.
  • the mounting angle position of the second mixing chamber assembly 2 and the first mixing chamber assembly 1 can be adjusted by adjusting the matching hole position when the third flange 116 is bolted to the fourth flange 211. To adapt to different installation requirements.
  • the second tube 132 of the first mixing tube 13 at least partially extends into the second mixing tube 23, and the second mixing tube 23 is disposed opposite to the first mixing tube.
  • 13 is a shroud 231 that forces the flow of gas to flow in the opposite direction.
  • the shroud 231 is bowl-shaped and is provided with a curved end wall 2311.
  • a first mixing space 232 is disposed between the second tube 132 and the second mixing tube 23, and a second mixing space 233 is disposed between the second mixing tube 23 and the second housing 21.
  • the second mixing tube 23 passes through the first support plate 24 and the second support plate 25.
  • a first gap 241 through which the airflow passes is disposed between the first support plate 24 and the inner wall of the second casing 21.
  • a second gap 251 through which the airflow passes is disposed between the second support plate 25 and the inner wall of the second casing 21.
  • the exhaust gas post-treatment device 100 in the second embodiment of the present invention is larger than the first embodiment.
  • the difference is in the structure, installation direction and installation method of the intake pipe 12.
  • the intake pipe 12 is arranged side by side and in parallel with the first mixing pipe 13.
  • the intake pipe 12 is provided with an intake cone 121, a porous tube 122 that cooperates with the inlet cone 121, and a blind flange plate 123 that cooperates with the porous tube 122.
  • the porous tube 122 is located in the first mixing chamber 10
  • the inlet cone 121 is located on one side of the porous tube 122
  • the blind flange plate 123 is located on the other side of the porous tube 122.
  • the air inlet cone 121 and the blind flange plate 123 are both detachably coupled to the first housing 11. In this way, by changing the installation position of the intake cone 121 and the blind flange plate 123, the intake direction of the intake pipe 12 can be adjusted to adapt to different installation requirements.
  • the catalyst carrier assembly 3 includes a selective catalytic reducing agent, and the catalyst carrier assembly 3 and the second housing 21 are Disconnected together.

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

Abstract

一种尾气后处理装置（100），其包括第一混合腔组件（1）、第二混合腔组件（2）以及催化剂载体组件（3）。所述第一混合腔组件（1）包括设有第一混合腔（10）的第一壳体（11）、进气管（12）以及至少部分位于所述第一混合腔（10）内的第一混合管（13）。所述第一混合管（13）设有位于所述第一混合腔（10）内的第一管体（131）以及延伸出所述第一混合腔（10）的第二管体（132），其中所述第一管体（131）的侧壁设有若干旋流片（1311）。所述第二混合腔组件（2）包括第二壳体（21）以及第二混合管（23）。所述第二混合管（23）设有正对所述第一混合管（13）以迫使气流反向流动的导流罩（231）。所述第一壳体（11）与所述第二壳体（21）相互隔开。如此设置，第一管体（131）上的旋流片（1311）的结构设计可以根据设计要求灵活调整，避免了现有技术中将第一混合管（13）整个设计在单一壳体中所造成的尺寸限制。

Description

尾气后处理装置
本申请要求了申请日为2016年6月15日、申请号为201610428578.6、发明名称为“尾气后处理装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种尾气后处理装置，属于发动机尾气后处理技术领域。
背景技术
研究表明尾气后处理***(例如选择性催化还原***，SCR***)管路中氨分布的均匀程度对***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。
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。
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。
发明内容
本发明的目的在于提供一种混合结构能够独立设计的尾气后处理装置。
为实现上述目的，本发明采用如下技术方案：一种尾气后处理装置，其包括第一混合腔组件、位于所述第一混合腔组件的下游的第二混合腔组件以及位于所述第二混合腔组件下游的催化剂载体组件，所述第一混合腔组件包括设有第一混合腔的第一壳体、与所述第一混合腔连通的进气管以及至少部分位于所述第一混合腔内的第一混合管，所述第一混合管设有位于所述第一混合腔内的第一管体以及延伸出所述第一混合腔的第二管体，其中所述第一管体的侧壁设有若干旋流片；所述第二混合腔组件包括第二壳体以及位于所述第二壳体内的第二混合管，所述第二混合管设有正对所述第一混合管以迫使气流反向流动的导流罩，所述第一壳体与所述第二壳体相互隔开。
作为本发明进一步改进的技术方案，所述第一壳体设有第一法兰，所述第一混合腔组件设有与所述进气管相固定的第二法兰，所述第一法兰与所述第二法兰通过螺栓可拆卸地连接在一起。
作为本发明进一步改进的技术方案，所述进气管与所述第一混合管并排且平行布置，所述进气管设有进气锥、与所述进气锥相配合的多孔管以及与所述多孔管相配合的盲法兰板，所述多孔管位于所述第一混合腔内，所述进气锥位于所述多孔管的一侧，所述盲法兰板位于所述多孔管的另一侧，其中所述进气锥和所述盲法兰板均与所述第一壳体可拆卸地连接在一起。
作为本发明进一步改进的技术方案，所述第一壳体设有用以安装尿素喷嘴以向所述第一混合管中喷射尿素的安装座；所述第一管体的侧壁设有靠近所述旋流片的若干开孔，所述开孔靠近所述安装座且与所述第一混合腔相连通。
作为本发明进一步改进的技术方案，所述第一混合腔组件设有焊接在所述第二管体上的第三法兰，所述第二混合腔组件设有焊接在所述第二壳体上的第四法兰，所述第三法兰与所述第四法兰通过螺栓可拆卸地连接在一起。
作为本发明进一步改进的技术方案，所述第二管体与所述第二混合管之间设有第一混合空间，所述第二混合管与所述第二壳体之间设有第二混合空间。
作为本发明进一步改进的技术方案，所述导流罩呈碗状，其设有弧形端壁。
作为本发明进一步改进的技术方案，所述第二混合腔组件设有支撑所述第二混合管的第一支撑板，所述第二混合管穿过所述第一支撑板，所述第一支撑板与所述第二壳体的内壁之间设有供气流穿过的第一间隙。
作为本发明进一步改进的技术方案，所述第二混合腔组件设有支撑所述第二混合管的第二支撑板，所述第二混合管穿过所述第二支撑板，所述第一支撑板与所述第二支撑板相互平行，所述第二支撑板与所述第二壳体的内壁之间设有供气流穿过的第二间隙。
作为本发明进一步改进的技术方案，所述催化剂载体组件包括选择性催化还原剂，所述催化剂载体组件与所述第二壳体可拆卸地连接在一起。
相较于现有技术，本发明通过将所述第一壳体与所述第二壳体相互隔开，第一混合管的第一管体设置在第二壳体的外部且通过第一壳体进行遮罩，因此第一管体上的旋流片的结构设计可以根据设计要求灵活调整，避免了现有技术中将第一混合管整个设计在单一壳体中所造成的尺寸限制。
附图说明
图1是本发明尾气后处理装置于第一实施方式中的立体示意图。
图2是图1的部分立体分解图。
图3是图2中部分第一混合腔组件的立体分解图。
图4是图3另一角度的立体分解图。
图5是图1的部分立体分解图，其中第二混合腔组件被分解出来。
图6是图5中第二混合腔组件进一步的立体分解图。
图7是图6另一角度的立体分解图。
图8是图1的右视图。
图9是沿图8中A-A线的剖面示意图。
图10是本发明尾气后处理装置于第二实施方式中的立体示意图。
图11是图10的部分立体分解图。
图12是图11中部分第一混合腔组件的立体分解图。
图13是图12另一角度的立体分解图。
图14是图10的部分立体分解图，其中第二混合腔组件被分解出来。
图15是图10的右视图。
图16是沿图15中B-B线的剖面示意图。
具体实施方式
请参图1至图9所示，本发明揭示了一种尾气后处理装置100，用以处理发动机的尾气。所述尾气后处理装置100包括第一混合腔组件1、位于所述第一混合腔组件1的下游的第二混合腔组件2以及位于所述第二混合腔组件2下游的催化剂载体组件3。在本发明图示的实施方式中，所述催化剂载体组件3包括选择性催化还原剂。
所述第一混合腔组件1包括设有第一混合腔10的第一壳体11、与所述第一混合腔10连通的进气管12以及至少部分位于所述第一混合腔10内的第一混合管13。在本发明的第一实施方式中，所述第一壳体11设有第一法兰111，所述第一混合腔组件1设有与所述进气管12相固定的第二法兰112，所述第一法兰111与所述第二法兰112通过螺栓113可拆卸地连接在一起。如此设置，通过调整安装方向可以对进气管12的方向进行调整，从而适应不同的安装要求。另外，所述第 一壳体11设有用以安装尿素喷嘴(未图示)以向所述第一混合管13中喷射尿素的安装座114。
请参图2至图5以及图9所示，所述第一混合管13设有位于所述第一混合腔10内的第一管体131以及延伸出所述第一混合腔10的第二管体132，其中所述第一管体131的侧壁设有若干旋流片1311以及位于所述旋流片1311的两侧且靠近所述旋流片1311的若干开孔1312，其中位于一侧的所述开孔1312靠近所述安装座114且与所述第一混合腔10相连通。在本发明图示的实施方式中，所述第一混合管13呈圆筒状，所述第一壳体11设有圆弧状的上表面115，从而使所述上表面115与所述第一混合管13之间形成弧形的腔体，以利于形成旋流。所述第一混合腔组件1还设有焊接在所述第二管体132上的第三法兰116。
请参图5至图9所示，所述第二混合腔组件2包括第二壳体21、位于所述第二壳体21内的第二混合管23以及用以支撑所述第二混合管23的第一支撑板24以及第二支撑板25。所述第一支撑板24与所述第二支撑板25相互平行。所述第二混合腔组件2设有焊接在所述第二壳体21上的第四法兰211。所述第一壳体11与所述第二壳体21相互隔开，所述第三法兰116与所述第四法兰211通过螺栓212可拆卸地连接在一起。如此设置，本发明通过将第一混合管13的第一管体131设置在第二壳体21的外部且通过第一壳体11进行遮罩，因此第一管体131上的旋流片1311的结构设计(例如旋流片1311的长度、开设密度等)可以根据设计要求灵活调整，避免了现有技术中将第一混合管13整个设计在单一壳体中所造成的尺寸限制。换言之，第一管体131上的混合结构能够独立设计，避免受到整个壳体的尺寸限制。另外，通过调整所述第三法兰116与所述第四法兰211螺栓连接时的配合孔位，可以调整所述第二混合腔组件2与所述第一混合腔组件1的安装角度位置，从而适应不同的安装要求。
请参图9所示，所述第一混合管13的第二管体132至少部分延伸入所述第二混合管23中，所述第二混合管23设有正对所述第一混合管13以迫使气流反向流动的导流罩231。在本发明图示的实施方式中，所述导流罩231呈碗状，其设有弧形端壁2311。所述第二管体132与所述第二混合管23之间设有第一混合空间232，所述第二混合管23与所述第二壳体21之间设有第二混合空间233。所述第二混合管23穿过所述第一支撑板24以及所述第二支撑板25。所述第一支撑板24与所述第二壳体21的内壁之间设有供气流穿过的第一间隙241。所述第二支撑板25与所述第二壳体21的内壁之间设有供气流穿过的第二间隙251。
请参图10至图16所示，在本发明第二实施方式中的尾气后处理装置100与第一实施方式大 致相同，区别在于进气管12的结构、安装方向以及安装方式。在本发明第二实施方式中，所述进气管12与所述第一混合管13并排且平行布置。所述进气管12设有进气锥121、与所述进气锥121相配合的多孔管122以及与所述多孔管122相配合的盲法兰板123。所述多孔管122位于所述第一混合腔10内，所述进气锥121位于所述多孔管122的一侧，所述盲法兰板123位于所述多孔管122的另一侧。所述进气锥121与所述盲法兰板123均与所述第一壳体11可拆卸地连接在一起。如此设置，通过调换所述进气锥121与所述盲法兰板123的安装位置，可以对进气管12的进气方向进行调整，从而适应不同的安装要求。
请参图11至图16所示，在本发明图示的第二实施方式中，所述催化剂载体组件3包括选择性催化还原剂，所述催化剂载体组件3与所述第二壳体21可拆卸地连接在一起。
当发动机的尾气自进气管12进入第一混合腔10内时，绝大部分的尾气在旋流片1311的导引下旋转进入第一混合管13，少量的尾气自开孔1312进入第一混合管13。当满足喷射条件时，尿素喷嘴向第一混合管13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9及图16中的虚线箭头所示，随后，在导流罩231的作用下迫使气流沿着第一混合空间232反向(例如向上游)流动；反向之后的气流沿着第二混合空间233，并穿过第一间隙241与第二间隙251到达位于下游的催化剂载体组件3。如此设置，增加了尿素蒸发的距离和时间，提高了气流混合的均匀性，降低了尿素结晶的风险。
另外，以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，对本说明书的理解应该以所属技术领域的技术人员为基础，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (10)

  1. 一种尾气后处理装置，其包括第一混合腔组件、位于所述第一混合腔组件的下游的第二混合腔组件以及位于所述第二混合腔组件下游的催化剂载体组件，其特征在于：所述第一混合腔组件包括设有第一混合腔的第一壳体、与所述第一混合腔连通的进气管以及至少部分位于所述第一混合腔内的第一混合管，所述第一混合管设有位于所述第一混合腔内的第一管体以及延伸出所述第一混合腔的第二管体，其中所述第一管体的侧壁设有若干旋流片；所述第二混合腔组件包括第二壳体以及位于所述第二壳体内的第二混合管，所述第二混合管设有正对所述第一混合管以迫使气流反向流动的导流罩，所述第一壳体与所述第二壳体相互隔开。
  2. 如权利要求1所述的尾气后处理装置，其特征在于：所述第一壳体设有第一法兰，所述第一混合腔组件设有与所述进气管相固定的第二法兰，所述第一法兰与所述第二法兰通过螺栓可拆卸地连接在一起。
  3. 如权利要求1所述的尾气后处理装置，其特征在于：所述进气管与所述第一混合管并排且平行布置，所述进气管设有进气锥、与所述进气锥相配合的多孔管以及与所述多孔管相配合的盲法兰板，所述多孔管位于所述第一混合腔内，所述进气锥位于所述多孔管的一侧，所述盲法兰板位于所述多孔管的另一侧，其中所述进气锥和所述盲法兰板均与所述第一壳体可拆卸地连接在一起。
  4. 如权利要求2或3所述的尾气后处理装置，其特征在于：所述第一壳体设有用以安装尿素喷嘴以向所述第一混合管中喷射尿素的安装座；所述第一管体的侧壁设有靠近所述旋流片的若干开孔，所述开孔靠近所述安装座且与所述第一混合腔相连通。
  5. 如权利要求2或3所述的尾气后处理装置，其特征在于：所述第一混合腔组件设有焊接在所述第二管体上的第三法兰，所述第二混合腔组件设有焊接在所述第二壳体上的第四法兰，所述第三法兰与所述第四法兰通过螺栓可拆卸地连接在一起。
  6. 如权利要求2或3所述的尾气后处理装置，其特征在于：所述第二管体与所述第二混合管之间设有第一混合空间，所述第二混合管与所述第二壳体之间设有第二混合空间。
  7. 如权利要求2或3所述的尾气后处理装置，其特征在于：所述导流罩呈碗状，其设有弧形端壁。
  8. 如权利要求6所述的尾气后处理装置，其特征在于：所述第二混合腔组件设有支撑所述第二混合管的第一支撑板，所述第二混合管穿过所述第一支撑板，所述第一支撑板与所述第二壳体的内壁之间设有供气流穿过的第一间隙。
  9. 如权利要求8所述的尾气后处理装置，其特征在于：所述第二混合腔组件设有支撑所述第二混合管的第二支撑板，所述第二混合管穿过所述第二支撑板，所述第一支撑板与所述第二支撑板相互平行，所述第二支撑板与所述第二壳体的内壁之间设有供气流穿过的第二间隙。
  10. 如权利要求2或3所述的尾气后处理装置，其特征在于：所述催化剂载体组件包括选择性催化还原剂，所述催化剂载体组件与所述第二壳体可拆卸地连接在一起。
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