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WO2018068667A1 - Tail gas after-treatment device - Google Patents

Tail gas after-treatment device Download PDF

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Publication number
WO2018068667A1
WO2018068667A1 PCT/CN2017/104330 CN2017104330W WO2018068667A1 WO 2018068667 A1 WO2018068667 A1 WO 2018068667A1 CN 2017104330 W CN2017104330 W CN 2017104330W WO 2018068667 A1 WO2018068667 A1 WO 2018068667A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
mixing
mixing tube
urea
aftertreatment device
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/CN2017/104330
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French (fr)
Chinese (zh)
Inventor
殷雷
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
Original Assignee
Tenneco Suzhou Emission System Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tenneco Suzhou Emission System Co Ltd filed Critical Tenneco Suzhou Emission System Co Ltd
Publication of WO2018068667A1 publication Critical patent/WO2018068667A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing

Definitions

  • the 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 exhaust pipe when severe, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • the present invention adopts the following technical solutions:
  • an exhaust gas aftertreatment device includes a casing, a mixer assembly installed in the casing, and a post-treatment carrier located downstream of the mixer assembly; An exhaust gas inlet passage and a mount for mounting a urea nozzle, the urea nozzle being provided with an injection hole at an end thereof for injecting urea droplets into the mixer assembly; the exhaust gas aftertreatment device is further provided An exhaust gas guiding portion and a blocking piece that cooperates with the exhaust gas guiding portion and at least partially surrounds a periphery of the injection hole, wherein the blocking piece is adjacent to the injection hole, and the exhaust gas guiding portion is provided with The exhaust gas guiding passage is connected to the exhaust gas inlet passage.
  • the mixer assembly includes a mixing tube provided with a mixing chamber in communication with the exhaust gas inlet passage and an exhaust gas for entering the mixing chamber and/or
  • the mixed gas stream of off-gas and urea droplets forms a number of swirls of the vortex.
  • the blocking piece has an arc shape and is located in the mixing cavity, and the exhaust gas guiding channel enters the inner surface of the blocking piece in a tangential direction to form on the inner surface. Swirl.
  • the blocking piece has a C shape or an O shape or a spiral shape.
  • the mixing tube has a cylindrical shape, and the swirling sheet is formed by punching the mixing tube outward, and the swirling sheet is distributed on an outer circumferential surface of the mixing tube.
  • the mixing tube is provided with an opening corresponding to the swirling sheet, and the opening connects the mixing chamber with the exhaust air inlet passage.
  • the mixing tube is provided with a plurality of openings adjacent to the mounting seat and distributed on the outer circumferential surface, and the opening is located in the axial direction of the mixing tube. Between the mount and the swirling sheet.
  • the housing is provided with a cover plate welded on one end of the mixing tube, the mounting seat is welded on one side of the cover plate, the blocking piece and/or the The exhaust gas guide is welded to the other side of the cover.
  • the exhaust gas guiding portion is fixed on the mixing tube, and the exhaust gas guiding passage is provided with an exhaust gas guiding port exposed on the mixing tube.
  • the mixer assembly is provided with a bowl cover at the bottom of the mixing tube and a Z-shaped partition plate cooperating with the mixing tube, wherein the mixing tube comprises an air outlet at the lower end Separating the housing into a first cavity and a second cavity, wherein the first cavity is in communication with the mixing cavity, and the second cavity is in communication with the airflow outlet,
  • the bowl lid is used to force the airflow to flow in the opposite direction.
  • the mixer assembly is provided with a disk-shaped mounting portion and an interference flow sheet that protrudes from the mounting portion and extends toward the post-processing carrier.
  • the present invention can provide at least a small portion of the exhaust gas directly to the vicinity of the injection hole by providing the exhaust gas guiding passage, and form a swirling flow under the action of the flap.
  • the temperature near the injection hole is increased, and the risk of urea crystallization is lowered; on the other hand, the swirl formed by the flap can quickly take the sprayed urea droplet away, avoiding death.
  • the zone thus also 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 a perspective view of the exhaust gas guiding portion and the flap of FIG. 3.
  • Figure 5 is a perspective view of the mixer assembly of Figure 2.
  • Fig. 6 is a partially exploded perspective view of Fig. 5;
  • Figure 7 is a partially exploded perspective view of another angle of Figure 6.
  • Figure 8 is a partial enlarged view of the circled portion of Figure 5.
  • Figure 9 is a partially exploded perspective view of another embodiment of the mixer assembly, wherein the structure of the flap is slightly different from that of Figure 6.
  • Figure 10 is a partially exploded perspective view of the other angle of Figure 9.
  • Figure 11 is a cross-sectional view taken along line A-A of Figure 1.
  • Figure 12 is a cross-sectional view showing another embodiment of the exhaust gas aftertreatment device of the present invention.
  • the present invention discloses an exhaust aftertreatment device 100 for treating exhaust gas of a diesel engine, comprising a housing 1, a mixer assembly 2 mounted in the housing 1.
  • the post-treatment carrier 3 includes a selective catalytic reducing agent (SCR) 31 and an ammonia leakage catalyst (ASC) 32.
  • the housing 1 is provided with an exhaust gas intake passage 11, a mounting seat 12 for mounting the urea nozzle 5, and a cover plate 13 for welding the mounting seat 12.
  • the urea nozzle 5 is provided with an injection hole 51 at its end for injecting urea droplets into the mixer assembly 2.
  • the mixer assembly 2 includes a mixing tube 21, a bowl cover 22 at the bottom of the mixing tube 21, and a Z-shaped partition 23 that mates with the mixing tube 21.
  • the mixing tube 21 has a cylindrical shape, and is provided with a mixing chamber 211 communicating with the exhaust gas inlet passage 11 and exhaust gas for entering the mixing chamber 211 and / or a mixed gas stream of exhaust gas and urea droplets forms a plurality of swirl fins 212 of the vortex flow.
  • the swirling sheet 212 is formed by punching the mixing tube 21 outward, and the swirling sheet 212 is distributed on the outer circumferential surface of the mixing tube 21.
  • the mixing tube 21 is provided with an opening 213 corresponding to the swirling fin 212, and the opening 213 connects the mixing chamber 211 with the exhaust gas inlet passage 11.
  • the mixing tube 21 is provided with a plurality of openings 214 adjacent to the mounting seat 12 and distributed on the outer circumferential surface, the opening 214 being located in the mounting seat in the axial direction of the mixing tube 21. 12 is between the swirling sheet 212.
  • the opening 214 allows a portion of the exhaust gas to pass through, and on the one hand increases the temperature near the urea nozzle 5, The risk of urea crystallization is reduced; on the other hand, it helps to carry away the sprayed urea droplets, which also reduces the risk of urea crystallization.
  • the mixing tube 21 further includes an air outlet 215 at the lower end (see Fig. 11).
  • the partition plate 23 partitions the casing 1 into a first cavity 231 and a second cavity 232, wherein the first cavity 231 is in communication with the mixing cavity 211, and the second cavity 232 is The airflow outlet 215 is connected.
  • the bowl cover 22 is used to force the airflow to flow in the opposite direction, increasing the distance and time for the urea to evaporate, and improving the uniformity of the airflow mixing.
  • the anti-urea crystal structure 4 is like a whistle in the illustrated embodiment of the present invention, which includes an exhaust gas guiding portion 41 and cooperates with the exhaust gas guiding portion 41 and at least partially surrounds a baffle 42 at the periphery of the injection hole 51, wherein the baffle 42 is adjacent to the injection hole 51, and the exhaust gas guiding portion 41 is provided with an exhaust gas guiding passage 411 communicating with the exhaust gas intake passage 11 .
  • the blocking piece 42 has an arc shape and is located in the mixing chamber 211.
  • the exhaust gas guiding passage 411 enters the inner surface of the flap 42 in a tangential direction to form a swirl on the inner surface.
  • the exhaust gas guiding portion 41 may be one or more.
  • the blocking piece 42 has an O shape.
  • the blocking piece 42 has a C shape.
  • the flap 42 may also have a spiral shape or the like which is easy to form a swirling flow. In other embodiments, the flap may also have other shapes such as a V shape.
  • the cover plate 13 is welded to one end (for example, the upper end) of the mixing tube 21.
  • the mounting seat 12 is welded to one side (for example, the upper side) of the cover plate 13, and the blocking piece 42 and/or the exhaust gas guiding portion 41 are welded to the other side of the cover plate 13 (for example, side).
  • the exhaust gas guiding portion 41 is fixed to the mixing tube 21.
  • the exhaust gas guiding passage 411 is provided with an exhaust gas guiding port exposed on the mixing pipe 21.
  • the aforementioned anti-urea crystal structure 4 can also be applied to another embodiment of the exhaust gas aftertreatment device 100 of the present invention.
  • the same reference numerals indicate the same or similar elements.
  • the exhaust gas aftertreatment device 100 in the second embodiment is different from the structure of the exhaust gas aftertreatment device 100 in the first embodiment, wherein in the second embodiment, the mixer assembly 2 is provided with a disk-shaped mounting portion. And an interference flow sheet 25 that protrudes from the mounting portion 24 and extends toward the post-processing carrier 3.
  • the spoiler 25 can improve the mixing uniformity of the atomized urea droplets and the exhaust gas.

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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 after-treatment device, comprising a housing (1), a mixer assembly (2) and an after-treatment carrier (3). The housing is provided with a tail gas inlet channel (11), and an installation base (12) for installing a urea nozzle (5). The urea nozzle is provided with a spray hole (51) located at a tail end of the urea nozzle. The tail gas after-treatment device is further provided with a tail gas guiding portion (41) and a blocking piece (42) at least partially surrounding the periphery of the spray hole, the tail gas guiding portion being provided with a tail gas guiding channel (411) in communication with the tail gas inlet channel. Such an arrangement increases the temperature near the spray hole, and reduces the risk of urea crystallization. Additionally, the swirling flow formed by the blocking piece can quickly bring away sprayed urea liquid drops, thereby preventing dead zones and also reducing the risk of urea crystallization.

Description

尾气后处理装置Exhaust aftertreatment device

本申请要求了申请日为2016年10月12日、申请号为201610888496.X、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 No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No 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，严重时会堵塞排气管、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 exhaust pipe when severe, resulting in a decrease in engine power performance.

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能够降低尿素结晶风险的尾气后处理装置。It is an object of the present invention to provide an exhaust gas aftertreatment device capable of reducing the risk of urea crystallization.

为实现上述目的，本发明采用如下技术方案：To achieve the above object, the present invention adopts the following technical solutions:

作为本发明进一步改进的技术方案，一种尾气后处理装置，其包括壳体、安装在所述壳体内的混合器组件以及位于所述混合器组件的下游的后处理载体；所述壳体设有尾气进气通道以及用以安装尿素喷嘴的安装座，所述尿素喷嘴设有位于其末端且用以向所述混合器组件中喷射尿素液滴的喷射孔；所述尾气后处理装置还设有尾气导引部以及与所述尾气导引部相配合且至少部分环绕在所述喷射孔的外围的挡片，其中所述挡片靠近所述喷射孔，所述尾气导引部设有与所述尾气进气通道相连通的尾气导引通道。As a further improved technical solution of the present invention, an exhaust gas aftertreatment device includes a casing, a mixer assembly installed in the casing, and a post-treatment carrier located downstream of the mixer assembly; An exhaust gas inlet passage and a mount for mounting a urea nozzle, the urea nozzle being provided with an injection hole at an end thereof for injecting urea droplets into the mixer assembly; the exhaust gas aftertreatment device is further provided An exhaust gas guiding portion and a blocking piece that cooperates with the exhaust gas guiding portion and at least partially surrounds a periphery of the injection hole, wherein the blocking piece is adjacent to the injection hole, and the exhaust gas guiding portion is provided with The exhaust gas guiding passage is connected to the exhaust gas inlet passage.

作为本发明进一步改进的技术方案，所述混合器组件包括混合管，所述混合管设有与所述尾气进气通道相连通的混合腔以及用以将进入所述混合腔的尾气及/或尾气与尿素液滴的混合气流形成涡旋流的若干旋流片。 As a further improved technical solution of the present invention, the mixer assembly includes a mixing tube provided with a mixing chamber in communication with the exhaust gas inlet passage and an exhaust gas for entering the mixing chamber and/or The mixed gas stream of off-gas and urea droplets forms a number of swirls of the vortex.

作为本发明进一步改进的技术方案，所述挡片呈圆弧状且位于所述混合腔内，所述尾气导引通道沿切线方向进入所述挡片的内表面以在所述内表面上形成旋流。As a further improved technical solution of the present invention, the blocking piece has an arc shape and is located in the mixing cavity, and the exhaust gas guiding channel enters the inner surface of the blocking piece in a tangential direction to form on the inner surface. Swirl.

作为本发明进一步改进的技术方案，所述挡片呈C形或者O形或者螺旋形。As a further improved technical solution of the present invention, the blocking piece has a C shape or an O shape or a spiral shape.

作为本发明进一步改进的技术方案，所述混合管呈圆筒状，所述旋流片是向外冲压所述混合管而形成的，所述旋流片分布在所述混合管的外圆周面上；所述混合管设有与所述旋流片一一对应的开口，所述开口将所述混合腔与所述尾气进气通道连通起来。As a further improved technical solution of the present invention, the mixing tube has a cylindrical shape, and the swirling sheet is formed by punching the mixing tube outward, and the swirling sheet is distributed on an outer circumferential surface of the mixing tube. The mixing tube is provided with an opening corresponding to the swirling sheet, and the opening connects the mixing chamber with the exhaust air inlet passage.

作为本发明进一步改进的技术方案，所述混合管设有靠近所述安装座且分布在所述外圆周面上的若干开孔，所述开孔在所述混合管的轴线方向上位于所述安装座与所述旋流片之间。As a further improved technical solution of the present invention, the mixing tube is provided with a plurality of openings adjacent to the mounting seat and distributed on the outer circumferential surface, and the opening is located in the axial direction of the mixing tube. Between the mount and the swirling sheet.

作为本发明进一步改进的技术方案，所述壳体设有焊接在所述混合管的一端上的盖板，所述安装座焊接在所述盖板的一侧，所述挡片及/或所述尾气导引部焊接在所述盖板的另一侧。As a further improved technical solution of the present invention, the housing is provided with a cover plate welded on one end of the mixing tube, the mounting seat is welded on one side of the cover plate, the blocking piece and/or the The exhaust gas guide is welded to the other side of the cover.

作为本发明进一步改进的技术方案，所述尾气导引部固定在所述混合管上，所述尾气导引通道设有暴露在所述混合管上的尾气导引口。As a further improved technical solution of the present invention, the exhaust gas guiding portion is fixed on the mixing tube, and the exhaust gas guiding passage is provided with an exhaust gas guiding port exposed on the mixing tube.

作为本发明进一步改进的技术方案，所述混合器组件设有位于所述混合管底部的碗盖以及与所述混合管相配合的Z形隔板，其中所述混合管包括位于下端的气流出口，所述隔板将所述壳体分隔成第一腔体以及第二腔体，其中所述第一腔体与所述混合腔连通，所述第二腔体与所述气流出口连通，所述碗盖用以迫使气流反向流动。As a further improved technical solution of the present invention, the mixer assembly is provided with a bowl cover at the bottom of the mixing tube and a Z-shaped partition plate cooperating with the mixing tube, wherein the mixing tube comprises an air outlet at the lower end Separating the housing into a first cavity and a second cavity, wherein the first cavity is in communication with the mixing cavity, and the second cavity is in communication with the airflow outlet, The bowl lid is used to force the airflow to flow in the opposite direction.

作为本发明进一步改进的技术方案，所述混合器组件设有圆盘状的安装部以及凸出所述安装部且向所述后处理载体延伸的若干扰流片。As a further improved technical solution of the present invention, the mixer assembly is provided with a disk-shaped mounting portion and an interference flow sheet that protrudes from the mounting portion and extends toward the post-processing carrier.

相较于现有技术，本发明通过设置尾气导引通道，能够至少将少部分尾气直接引至喷射孔的附近，并在挡片的作用下形成旋流。如此设置，一方面，提高了喷射孔附近的温度，降低了尿素结晶的风险；另一方面，由于挡片所形成的旋流能够很快地将喷射出来的尿素液滴带走，避免了死区，从而也降低了尿素结晶的风险。Compared with the prior art, the present invention can provide at least a small portion of the exhaust gas directly to the vicinity of the injection hole by providing the exhaust gas guiding passage, and form a swirling flow under the action of the flap. In this way, on the one hand, the temperature near the injection hole is increased, and the risk of urea crystallization is lowered; on the other hand, the swirl formed by the flap can quickly take the sprayed urea droplet away, avoiding death. The zone thus also 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中的尾气导引部以及挡片的立体示意图。4 is a perspective view of the exhaust gas guiding portion and the flap of FIG. 3.

图5是图2中混合器组件的立体示意图。Figure 5 is a perspective view of the mixer assembly of Figure 2.

图6是图5的部分立体分解图。Fig. 6 is a partially exploded perspective view of Fig. 5;

图7是图6另一角度的部分立体分解图。Figure 7 is a partially exploded perspective view of another angle of Figure 6.

图8是图5中画圈部分的局部放大图。Figure 8 is a partial enlarged view of the circled portion of Figure 5.

图9是混合器组件于另一实施方式的部分立体分解图，其中挡片的结构与图6略有不同。Figure 9 is a partially exploded perspective view of another embodiment of the mixer assembly, wherein the structure of the flap is slightly different from that of Figure 6.

图10是图9另一角度的部分立体分解图。Figure 10 is a partially exploded perspective view of the other angle of Figure 9.

图11是沿图1中A-A线的剖面示意图。Figure 11 is a cross-sectional view taken along line A-A of Figure 1.

图12是本发明尾气后处理装置于另一实施方式中的剖面示意图。Figure 12 is a cross-sectional view showing another embodiment of the exhaust gas aftertreatment device of the present invention.

具体实施方式detailed description

请参图1至图11所示，本发明揭示了一种尾气后处理装置100，用以处理柴油发动机的尾气，其包括壳体1、安装在所述壳体1内的混合器组件2、位于所述混合器组件2的下游的后处理载体3以及防尿素结晶结构4。请参图11所示，在本发明图示的实施方式中，所述后处理载体3包括选择性催化还原剂(SCR)31以及氨泄漏催化器(ASC)32。Referring to Figures 1 to 11, the present invention discloses an exhaust aftertreatment device 100 for treating exhaust gas of a diesel engine, comprising a housing 1, a mixer assembly 2 mounted in the housing 1. A post-treatment carrier 3 and an anti-urea crystal structure 4 located downstream of the mixer assembly 2. Referring to FIG. 11, in the illustrated embodiment of the present invention, the post-treatment carrier 3 includes a selective catalytic reducing agent (SCR) 31 and an ammonia leakage catalyst (ASC) 32.

所述壳体1设有尾气进气通道11、用以安装尿素喷嘴5的安装座12以及用以焊接所述安装座12的盖板13。所述尿素喷嘴5设有位于其末端且用以向所述混合器组件2中喷射尿素液滴的喷射孔51。The housing 1 is provided with an exhaust gas intake passage 11, a mounting seat 12 for mounting the urea nozzle 5, and a cover plate 13 for welding the mounting seat 12. The urea nozzle 5 is provided with an injection hole 51 at its end for injecting urea droplets into the mixer assembly 2.

在本发明的一种实施方式中，所述混合器组件2包括混合管21、位于所述混合管21底部的碗盖22以及与所述混合管21相配合的Z形隔板23。In one embodiment of the invention, the mixer assembly 2 includes a mixing tube 21, a bowl cover 22 at the bottom of the mixing tube 21, and a Z-shaped partition 23 that mates with the mixing tube 21.

在本发明图示的实施方式中，所述混合管21呈圆筒状，其设有与所述尾气进气通道11相连通的混合腔211以及用以将进入所述混合腔211的尾气及/或尾气与尿素液滴的混合气流形成涡旋流的若干旋流片212。如此设置，能够提高尾气与尿素液滴的混合距离，改善混合效果。所述旋流片212是向外冲压所述混合管21而形成的，所述旋流片212分布在所述混合管21的外圆周面上。所述混合管21设有与所述旋流片212一一对应的开口213，所述开口213将所述混合腔211与所述尾气进气通道11连通起来。另外，所述混合管21设有靠近所述安装座12且分布在所述外圆周面上的若干开孔214，所述开孔214在所述混合管21的轴线方向上位于所述安装座12与所述旋流片212之间。所述开孔214能够让部分尾气穿过，一方面提高了尿素喷嘴5附近的温度， 降低了尿素结晶的风险；另一方面，有助于将喷射出来的尿素液滴带走，从而也降低了尿素结晶的风险。所述混合管21还包括位于下端的气流出口215(参图11)。In the illustrated embodiment of the present invention, the mixing tube 21 has a cylindrical shape, and is provided with a mixing chamber 211 communicating with the exhaust gas inlet passage 11 and exhaust gas for entering the mixing chamber 211 and / or a mixed gas stream of exhaust gas and urea droplets forms a plurality of swirl fins 212 of the vortex flow. With this arrangement, the mixing distance between the exhaust gas and the urea droplets can be increased, and the mixing effect can be improved. The swirling sheet 212 is formed by punching the mixing tube 21 outward, and the swirling sheet 212 is distributed on the outer circumferential surface of the mixing tube 21. The mixing tube 21 is provided with an opening 213 corresponding to the swirling fin 212, and the opening 213 connects the mixing chamber 211 with the exhaust gas inlet passage 11. In addition, the mixing tube 21 is provided with a plurality of openings 214 adjacent to the mounting seat 12 and distributed on the outer circumferential surface, the opening 214 being located in the mounting seat in the axial direction of the mixing tube 21. 12 is between the swirling sheet 212. The opening 214 allows a portion of the exhaust gas to pass through, and on the one hand increases the temperature near the urea nozzle 5, The risk of urea crystallization is reduced; on the other hand, it helps to carry away the sprayed urea droplets, which also reduces the risk of urea crystallization. The mixing tube 21 further includes an air outlet 215 at the lower end (see Fig. 11).

所述隔板23将所述壳体1分隔成第一腔体231以及第二腔体232，其中所述第一腔体231与所述混合腔211连通，所述第二腔体232与所述气流出口215连通。所述碗盖22用以迫使气流反向流动，增加了尿素蒸发的距离和时间，提高了气流混合的均匀性。The partition plate 23 partitions the casing 1 into a first cavity 231 and a second cavity 232, wherein the first cavity 231 is in communication with the mixing cavity 211, and the second cavity 232 is The airflow outlet 215 is connected. The bowl cover 22 is used to force the airflow to flow in the opposite direction, increasing the distance and time for the urea to evaporate, and improving the uniformity of the airflow mixing.

请参图4所示，所述防尿素结晶结构4在本发明图示的实施方式中像一个口哨，其包括尾气导引部41以及与所述尾气导引部41相配合且至少部分环绕在所述喷射孔51的外围的挡片42，其中所述挡片42靠近所述喷射孔51，所述尾气导引部41设有与所述尾气进气通道11相连通的尾气导引通道411。优选地，所述挡片42呈圆弧状且位于所述混合腔211内。所述尾气导引通道411沿切线方向进入所述挡片42的内表面以在所述内表面上形成旋流。如此设置，一方面，提高了喷射孔51附近的温度，降低了尿素结晶的风险；另一方面，由于挡片42所形成的旋流能够很快地将喷射出来的尿素液滴带走，避免了死区，从而也降低了尿素结晶的风险。所述尾气导引部41可以为一个或者多个。Referring to FIG. 4, the anti-urea crystal structure 4 is like a whistle in the illustrated embodiment of the present invention, which includes an exhaust gas guiding portion 41 and cooperates with the exhaust gas guiding portion 41 and at least partially surrounds a baffle 42 at the periphery of the injection hole 51, wherein the baffle 42 is adjacent to the injection hole 51, and the exhaust gas guiding portion 41 is provided with an exhaust gas guiding passage 411 communicating with the exhaust gas intake passage 11 . Preferably, the blocking piece 42 has an arc shape and is located in the mixing chamber 211. The exhaust gas guiding passage 411 enters the inner surface of the flap 42 in a tangential direction to form a swirl on the inner surface. With this arrangement, on the one hand, the temperature in the vicinity of the injection hole 51 is increased, and the risk of crystallization of urea is lowered; on the other hand, since the swirl formed by the flap 42 can quickly carry away the sprayed urea droplets, avoiding The dead zone also reduces the risk of urea crystallization. The exhaust gas guiding portion 41 may be one or more.

请参图4所示，在本发明的一种实施方式中，所述挡片42呈O形。请参图9及图10所示，在本发明的另一种实施方式中，所述挡片42呈C形。当然，所述挡片42还可以为螺旋形等凡是易于形成旋流的各种形状。在其他实施方式中，所述挡片也可以呈V形等其他形状。Referring to FIG. 4, in an embodiment of the present invention, the blocking piece 42 has an O shape. Referring to FIG. 9 and FIG. 10, in another embodiment of the present invention, the blocking piece 42 has a C shape. Of course, the flap 42 may also have a spiral shape or the like which is easy to form a swirling flow. In other embodiments, the flap may also have other shapes such as a V shape.

所述盖板13焊接在所述混合管21的一端上(例如上端)。所述安装座12焊接在所述盖板13的一侧(例如上侧)，所述挡片42及/或所述尾气导引部41焊接在所述盖板13的另一侧(例如下侧)。在本发明图示的实施方式中，所述尾气导引部41固定在所述混合管21上。所述尾气导引通道411设有暴露在所述混合管21上的尾气导引口。The cover plate 13 is welded to one end (for example, the upper end) of the mixing tube 21. The mounting seat 12 is welded to one side (for example, the upper side) of the cover plate 13, and the blocking piece 42 and/or the exhaust gas guiding portion 41 are welded to the other side of the cover plate 13 (for example, side). In the illustrated embodiment of the invention, the exhaust gas guiding portion 41 is fixed to the mixing tube 21. The exhaust gas guiding passage 411 is provided with an exhaust gas guiding port exposed on the mixing pipe 21.

请参图12所示，前述防尿素结晶结构4也可以应用在本发明尾气后处理装置100的另一实施方式中。在这两种实施方式中，相同的数字标号代表相同或类似的元件。可以理解，第二实施方式中的尾气后处理装置100与第一实施方式中的尾气后处理装置100的架构不同，其中在第二实施方式中，混合器组件2设有圆盘状的安装部24以及凸出所述安装部24且向所述后处理载体3延伸的若干扰流片25。所述扰流片25能够提高雾化后的尿素液滴与尾气的混合均匀性。Referring to FIG. 12, the aforementioned anti-urea crystal structure 4 can also be applied to another embodiment of the exhaust gas aftertreatment device 100 of the present invention. In both embodiments, the same reference numerals indicate the same or similar elements. It can be understood that the exhaust gas aftertreatment device 100 in the second embodiment is different from the structure of the exhaust gas aftertreatment device 100 in the first embodiment, wherein in the second embodiment, the mixer assembly 2 is provided with a disk-shaped mounting portion. And an interference flow sheet 25 that protrudes from the mounting portion 24 and extends toward the post-processing carrier 3. The spoiler 25 can improve the mixing uniformity of the atomized urea droplets and the exhaust gas.

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 BRIEF DESCRIPTION OF THE DRAWINGS However, those skilled in the art should understand that the invention may be modified or equivalently modified 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、安装在所述壳体内的混合器组件以及位于所述混合器组件的下游的后处理载体；所述壳体设有尾气进气通道以及用以安装尿素喷嘴的安装座，所述尿素喷嘴设有位于其末端且用以向所述混合器组件中喷射尿素液滴的喷射孔；其特征在于：所述尾气后处理装置还设有尾气导引部以及与所述尾气导引部相配合且至少部分环绕在所述喷射孔的外围的挡片，其中所述挡片靠近所述喷射孔，所述尾气导引部设有与所述尾气进气通道相连通的尾气导引通道。An exhaust aftertreatment device comprising a housing, a mixer assembly mounted within the housing, and a post-processing carrier downstream of the mixer assembly; the housing being provided with an exhaust gas intake passage and for mounting a mounting seat for a urea nozzle, the urea nozzle being provided with an injection hole at an end thereof for injecting urea droplets into the mixer assembly; characterized in that the exhaust gas after-treatment device is further provided with an exhaust gas guiding portion And a baffle that cooperates with the exhaust gas guiding portion and at least partially surrounds the outer periphery of the injection hole, wherein the baffle is adjacent to the injection hole, and the exhaust gas guiding portion is provided with the exhaust gas An exhaust gas guiding passage that communicates with the passage. 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混合管，所述混合管设有与所述尾气进气通道相连通的混合腔以及用以将进入所述混合腔的尾气及/或尾气与尿素液滴的混合气流形成涡旋流的若干旋流片。The exhaust aftertreatment device of claim 1 wherein said mixer assembly includes a mixing tube, said mixing tube being provided with a mixing chamber in communication with said exhaust gas inlet passage and for accessing said The exhaust gas of the mixing chamber and/or the mixed gas stream of the exhaust gas and the urea droplets form a plurality of swirling fins of the swirling flow. 如权利要求2所述的尾气后处理装置，其特征在于：所述挡片呈圆弧状且位于所述混合腔内，所述尾气导引通道沿切线方向进入所述挡片的内表面以在所述内表面上形成旋流。The exhaust gas after-treatment device according to claim 2, wherein the blocking piece has an arc shape and is located in the mixing chamber, and the exhaust gas guiding passage enters the inner surface of the blocking piece in a tangential direction. A swirl is formed on the inner surface. 如权利要求3所述的尾气后处理装置，其特征在于：所述挡片呈C形或者O形或者螺旋形。The exhaust aftertreatment device according to claim 3, wherein the flap has a C shape or an O shape or a spiral shape. 如权利要求2所述的尾气后处理装置，其特征在于：所述混合管呈圆筒状，所述旋流片是向外冲压所述混合管而形成的，所述旋流片分布在所述混合管的外圆周面上；所述混合管设有与所述旋流片一一对应的开口，所述开口将所述混合腔与所述尾气进气通道连通起来。The exhaust gas after-treatment device according to claim 2, wherein the mixing tube has a cylindrical shape, and the swirling sheet is formed by punching the mixing tube outward, and the swirling sheet is distributed in the chamber. The outer circumferential surface of the mixing tube; the mixing tube is provided with an opening corresponding to the swirling sheet, the opening connecting the mixing chamber with the exhaust gas inlet passage. 如权利要求5所述的尾气后处理装置，其特征在于：所述混合管设有靠近所述安装座且分布在所述外圆周面上的若干开孔，所述开孔在所述混合管的轴线方向上位于所述安装座与所述旋流片之间。The exhaust gas aftertreatment device according to claim 5, wherein said mixing tube is provided with a plurality of openings adjacent to said mounting seat and distributed on said outer circumferential surface, said opening being in said mixing tube In the axial direction, between the mount and the swirling sheet. 如权利要求6所述的尾气后处理装置，其特征在于：所述壳体设有焊接在所述混合管的一端上的盖板，所述安装座焊接在所述盖板的一侧，所述挡片及/或所述尾气导引部焊接在所述盖板的另一侧。 The exhaust gas aftertreatment device according to claim 6, wherein said casing is provided with a cover plate welded to one end of said mixing pipe, said mounting seat being welded to one side of said cover plate The flap and/or the exhaust guide are welded to the other side of the cover. 如权利要求7所述的尾气后处理装置，其特征在于：所述尾气导引部固定在所述混合管上，所述尾气导引通道设有暴露在所述混合管上的尾气导引口。The exhaust gas aftertreatment device according to claim 7, wherein said exhaust gas guiding portion is fixed to said mixing pipe, and said exhaust gas guiding passage is provided with an exhaust gas guiding port exposed on said mixing pipe . 如权利要求2所述的尾气后处理装置，其特征在于：所述混合器组件设有位于所述混合管底部的碗盖以及与所述混合管相配合的Z形隔板，其中所述混合管包括位于下端的气流出口，所述隔板将所述壳体分隔成第一腔体以及第二腔体，其中所述第一腔体与所述混合腔连通，所述第二腔体与所述气流出口连通，所述碗盖用以迫使气流反向流动。The exhaust gas aftertreatment device according to claim 2, wherein said mixer assembly is provided with a bowl cover at the bottom of said mixing tube and a Z-shaped partition plate cooperating with said mixing tube, wherein said mixing The tube includes an airflow outlet at a lower end, the partition separating the housing into a first cavity and a second cavity, wherein the first cavity is in communication with the mixing cavity, and the second cavity is The gas flow outlet is in communication and the bowl cover is used to force the gas flow to flow in the opposite direction. 如权利要求1所述的尾气后处理装置，其特征在于：所述混合器组件设有圆盘状的安装部以及凸出所述安装部且向所述后处理载体延伸的若干扰流片。 The exhaust aftertreatment device according to claim 1, wherein said mixer assembly is provided with a disk-shaped mounting portion and an interference flow sheet that protrudes from said mounting portion and extends toward said post-processing carrier.
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