WO2019019724A1 - Engine exhaust after-treatment package and application thereof - Google Patents

Engine exhaust after-treatment package and application thereof Download PDF

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Publication number
WO2019019724A1
WO2019019724A1 PCT/CN2018/084373 CN2018084373W WO2019019724A1 WO 2019019724 A1 WO2019019724 A1 WO 2019019724A1 CN 2018084373 W CN2018084373 W CN 2018084373W WO 2019019724 A1 WO2019019724 A1 WO 2019019724A1
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WIPO (PCT)
Prior art keywords
engine exhaust
mixing
assembly
tube
package
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PCT/CN2018/084373
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French (fr)
Chinese (zh)
Inventor
李军良
王天宇
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天纳克（苏州）排放***有限公司
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Publication of WO2019019724A1 publication Critical patent/WO2019019724A1/en

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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
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing

Definitions

  • the invention relates to an engine exhaust aftertreatment package and application, and belongs to the technical field of engine exhaust aftertreatment.
  • Mixer metal structures are currently used in the industry to achieve the mixing of urea droplets and exhaust gases.
  • a structure such as a perforated plate, a fin, or the like is disposed in the mixer, and the urea droplet collides with the mixer of the metal structure to break the urea droplet into smaller droplets to facilitate evaporation and pyrolysis on the metal surface.
  • the current situation is due to the escalation of emission regulations, making the current urea injection strategy more aggressive, such as starting a larger urea injection volume at lower temperatures and smaller exhaust flow rates.
  • heat conservation one is the heat required for evaporation and pyrolysis of urea droplets, and the other is the heat from the upstream.
  • the ratio between the total heat carried by the exhaust gas and the heat required for the urea solution to fully evaporate and pyrolyze is continuously reduced.
  • the industry uses a ratio called EER to describe the relationship between this heat.
  • EER the crystallization risk of a mixer with an EER value above 150 is extremely low. If the EER is not that high, but if the structure of the mixer is optimized, its anti-crystallization ability will be improved. This is also the research and development direction of most companies in the industry, namely how to optimize the structural design of the mixer.
  • a perforated plate 1' is provided in the mixer 3'.
  • the perforated plate 1' is provided with a plurality of openings 2' through which a mixture of exhaust gas and urea droplets is passed.
  • the urea droplets hitting the orifice plate 1' facilitate the crushing thereof to obtain a smaller volume of urea droplets, thereby facilitating its evaporation and pyrolysis.
  • the material portion between the openings 2' is unavoidable. It can be understood that on the back side of the perforated plate 1', the flow velocity of the gas flow is relatively low, and it is easy to form a local low velocity region M. Both theoretical and experimental results demonstrate that the possibility of urea crystallization occurring in the low velocity zone M is extremely high.
  • an engine exhaust aftertreatment package including a first aftertreatment component, a first mixing cavity component in communication with the first aftertreatment component, and the first a mixing tube in communication with the mixing chamber assembly, wherein the mixing tube includes a swirl tube at least partially located in the first mixing chamber assembly, the swirl tube including a hollow inner chamber and surrounding the inner chamber a plurality of fins circumferentially and circumferentially distributed, the first mixing chamber assembly including a mount for mounting a urea nozzle for injecting atomized urea droplets into the mixing tube,
  • the engine exhaust aftertreatment package further includes a fine fiber element located in the mixing tube, wherein the fine fiber element is used to pass the exhaust gas and the urea droplets to further increase the urea droplets Broken and evaporated.
  • the swirl tube includes a plurality of slots corresponding to the plurality of fins and communicating with the inner cavity, and is located at one side of the fin and adjacent to the mount Several openings.
  • the swirl tube is tapered.
  • the mixing tube comprises a connecting tube connected to the swirl tube, and the fine fiber element is located in the connecting tube.
  • the fine fiber element is steel wool or foam metal.
  • the engine exhaust aftertreatment package is provided with a plurality of fixing bars for fixing the fine fiber elements.
  • the engine exhaust aftertreatment package further includes a second aftertreatment component disposed side by side with the first aftertreatment component and a second mixing cavity in communication with the second aftertreatment component An assembly, the mixing tube being coupled between the first mixing chamber assembly and the second mixing chamber assembly; the first aftertreatment assembly and the second aftertreatment assembly being coupled by the first mixing chamber assembly
  • the mixing tube and the second mixing chamber assembly are connected in series.
  • the first aftertreatment component comprises a diesel oxidation catalyst and/or a diesel particulate trap
  • the second aftertreatment component comprises a selective catalytic reducing agent
  • the invention further relates to the use of a fine fiber element in the above described engine exhaust aftertreatment package.
  • the present invention allows the urea droplets to be sufficiently broken and mixed on the surface and inside of the fine fiber member by providing the fine fiber member.
  • the void is complicated, and the heat transfer area is large, which is beneficial to the full heat exchange between the urea droplets and the exhaust gas, thereby facilitating evaporation and pyrolysis of the urea droplets, and improving the anti-crystallization. ability.
  • Figure 1 is a schematic cross-sectional view showing the addition of a perforated plate in a mixing tube in the prior art.
  • Figure 2 is a schematic cross-sectional view of the perforated plate of Figure 1 with the flow direction of the mixture of exhaust gas and urea droplets and the dead zone on the back side.
  • FIG. 3 is a perspective view of the engine exhaust aftertreatment package of the present invention.
  • Fig. 4 is a partially exploded perspective view of Fig. 3;
  • Figure 5 is a further exploded perspective view of Figure 4.
  • Figure 6 is a left side elevational view of the first mixing chamber assembly and mixing tube of Figure 5.
  • Figure 7 is a right side elevational view of the first mixing chamber assembly and mixing tube of Figure 5.
  • Figure 8 is a front elevational view of the first mixing chamber assembly and mixing tube of Figure 5.
  • Figure 9 is a schematic cross-sectional view taken along line A-A of Figure 6.
  • Figure 10 is a schematic perspective view of a mixing tube and a fine fiber element.
  • Figure 11 is an exploded perspective view of the first mixing chamber assembly and mixing tube of Figure 5.
  • the present invention discloses an engine exhaust aftertreatment package 100 for use in an aftertreatment system such as an SCR to treat the exhaust of the engine.
  • the engine exhaust aftertreatment package 100 includes a first aftertreatment assembly 1 , a first mixing chamber assembly 2 in communication with the first aftertreatment assembly 1 , and the first a second aftertreatment assembly 3 in which the aftertreatment assembly 1 is arranged side by side, a second mixing chamber assembly 4 in communication with the second aftertreatment assembly 3, and a mixing tube that communicates the first and second mixing chamber assemblies 2, 4 5.
  • the first aftertreatment component 1 and the second aftertreatment component 3 are connected in series by the first and second mixing chamber assemblies 2, 4 and the mixing tube 5.
  • the first aftertreatment assembly 1 includes a first housing 11, a second housing 12, and an oxidation type catalytic converter (DOC) installed in the first housing 11.
  • DOC oxidation type catalytic converter
  • DPF particulate trap
  • the oxidizing catalytic converter is located upstream of the particle trap to provide a suitable temperature when the particulate trap is regenerated.
  • the second aftertreatment assembly 3 includes a third housing 31, a selective catalytic reducing agent (SCR) 32 mounted within the third housing 31, and the selection The exhaust outlet 33 downstream of the catalytic reducing agent 32.
  • SCR selective catalytic reducing agent
  • the first mixing chamber assembly 2 and the second mixing chamber assembly 4 are substantially identical in shape.
  • the first mixing chamber assembly 2 is for directing exhaust gas from the first aftertreatment assembly 1 to the mixing tube 5.
  • the first mixing chamber assembly 2 is provided at a position facing the mixing tube 5 with a mounting seat 21 for mounting a urea nozzle (not shown) for injecting atomization into the mixing tube 5 Urea droplets.
  • the mixing tube 5 comprises a swirl tube 51 at least partially located in the first mixing chamber assembly 2 and a connecting tube 52 connected to the swirl tube 51.
  • the swirl tube 51 is tapered, and includes a hollow inner cavity 511, a plurality of fins 512 surrounding the periphery of the inner cavity 511 and distributed in the circumferential direction, A plurality of slots 513 corresponding to the plurality of fins 512 and in communication with the inner cavity 511, and a plurality of openings 514 on one side of the fin 512 and adjacent to the mounting seat 21.
  • the fins 512 are capable of forming a mixing effect of the swirl, thereby increasing the mixing distance and reducing the risk of urea crystallization.
  • the engine exhaust aftertreatment package 100 further includes a fine fiber element 6 located in the mixing tube 5, wherein the fine fiber element 6 is used to pass the exhaust gas and the urea droplets to further increase The urea droplets are broken and evaporated.
  • the fine fiber element 6 is steel wool or foam metal, and the fine fiber element 6 is located within the connecting tube 52.
  • the engine exhaust aftertreatment package 100 is provided with a plurality of fixing bars 7 that fix the fine fiber elements 6.
  • the fine fiber element 6 may also be a mesh steel wire or a ceramic porous material or the like.
  • the present invention utilizes a 3D porous structure or a multi-voided structure of a fine fiber element 6 (e.g., steel wool), the exhaust gas and the urea droplets pass through the fine fiber element 6, so that the urea droplets are sufficiently formed on the surface and inside of the steel wool. Broken and mixed.
  • the steel wool has a small wire diameter, a complicated void, and a large specific surface area. Because of its large specific surface area, it can create a larger heat exchange area in a limited space, which is beneficial to the full heat exchange between urea droplets and exhaust gas, which facilitates evaporation and pyrolysis of urea droplets and improves resistance to crystallization. ability.
  • the back pressure of the system can be adjusted accordingly by adjusting the density of the fine fiber element 6.
  • the wire diameter of the fine fiber element 6 of the present invention is very small (for example, less than 1 mm), so that the occurrence of the leeward side can be avoided, thereby reducing the risk of urea crystallization.
  • the pioneering invention of the present invention solves both the problem of the low speed zone and the heat exchange problem, with outstanding substantial features and significant progress.

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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

Provided is an engine exhaust after-treatment package (100), comprising a first after-treatment assembly (1), a first mixing cavity assembly (2), and a mixing pipe (5) in communication with the first mixing cavity assembly (2), wherein the mixing pipe (5) comprises a swirl pipe (51) at least partially located in the first mixing cavity assembly (2). The swirl pipe (51) comprises a hollow inner cavity (511), and several fins (512) surrounding the periphery of the inner cavity (511) and distributed in a circumferential direction. The first mixing cavity assembly (2) comprises a mounting base (21) for mounting a urea nozzle, and the urea nozzle is used for spraying atomized urea droplets into the mixing pipe. The engine exhaust after-treatment package (100) further comprises a fine fiber element (6) located in the mixing pipe (5), wherein the fine fiber element (6) is used for exhaust gas and the urea droplets to pass through same, so as to further break up and evaporate the urea droplets. Application of the fine fiber element in the engine exhaust after-treatment package is further provided. With such an arrangement, the engine exhaust after-treatment package achieves a relatively strong crystallization resistance capability.

Description

发动机排气后处理封装及应用Engine exhaust aftertreatment package and application
本申请要求了申请日为2017年7月27日、申请号为201710624800.4、发明名称为“发动机排气后处理封装及应用”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 the priority of the Chinese patent application filed on July 27, 2017, the application number of which is hereby incorporated by reference. .
技术领域Technical field
本发明涉及一种发动机排气后处理封装及应用，属于发动机排气后处理技术领域。The invention relates to an engine exhaust aftertreatment package and application, and belongs to the technical field of engine exhaust aftertreatment.
背景技术Background technique
当前业内都是用混合器金属结构来达到尿素液滴与排气的混合。通常，在混合器中设置多孔板、翅片等结构，让尿素液滴和金属结构的混合器发生碰撞从而使尿素液滴破碎成更小的液滴，以有利于在金属表面蒸发和热解。现状是由于排放法规的升级，使得当前尿素喷射策略更加激进，例如在更低的温度、更小的排气流量下就开始较大的尿素喷射量。这里存在一个热量守恒的关系，一个是尿素液滴蒸发和热解所需要的热量，一个是排气从上游所带来的热量。由于上述喷射策略的激进化，排气所承载的总热量和尿素溶液充分蒸发、热解所需要的热量之间的比值不断降低。行业里面用以一个叫EER的比值来描述这个热量之间的关系。一般来讲，EER值在150以上混合器的结晶风险极低。如果EER没有那么高，但是如果通过对混合器的结构进行优化，其抗结晶能力会有一定的提高，这也是业界绝大部分公司的研发方向，即如何优化混合器的结构设计。Mixer metal structures are currently used in the industry to achieve the mixing of urea droplets and exhaust gases. Generally, a structure such as a perforated plate, a fin, or the like is disposed in the mixer, and the urea droplet collides with the mixer of the metal structure to break the urea droplet into smaller droplets to facilitate evaporation and pyrolysis on the metal surface. . The current situation is due to the escalation of emission regulations, making the current urea injection strategy more aggressive, such as starting a larger urea injection volume at lower temperatures and smaller exhaust flow rates. There is a relationship between heat conservation, one is the heat required for evaporation and pyrolysis of urea droplets, and the other is the heat from the upstream. Due to the radicalization of the above-described injection strategy, the ratio between the total heat carried by the exhaust gas and the heat required for the urea solution to fully evaporate and pyrolyze is continuously reduced. The industry uses a ratio called EER to describe the relationship between this heat. In general, the crystallization risk of a mixer with an EER value above 150 is extremely low. If the EER is not that high, but if the structure of the mixer is optimized, its anti-crystallization ability will be improved. This is also the research and development direction of most companies in the industry, namely how to optimize the structural design of the mixer.
请参图1及图2所示，在混合器3’中设置有开孔板1’。所述开孔板1’设有若干供排气与尿素液滴的混合物穿过的若干开孔2’。一方面，打在开孔板1’上的尿素液滴有利于实现其破碎以得到体积更小的尿素液滴，从而更利于其蒸发和热解。另一方面，为了保证开孔板1’具备足够的机械强度，开孔2’之间的材料部分是无法避免的。可以理解，在开孔板1’的背面，气流的流速相对比较低，容易形成局部的低速区M。理论和实验结果均证明，在该低速区M中发生尿素结晶的可能性极大。Referring to Figures 1 and 2, a perforated plate 1' is provided in the mixer 3'. The perforated plate 1' is provided with a plurality of openings 2' through which a mixture of exhaust gas and urea droplets is passed. On the one hand, the urea droplets hitting the orifice plate 1' facilitate the crushing thereof to obtain a smaller volume of urea droplets, thereby facilitating its evaporation and pyrolysis. On the other hand, in order to ensure that the perforated plate 1' has sufficient mechanical strength, the material portion between the openings 2' is unavoidable. It can be understood that on the back side of the perforated plate 1', the flow velocity of the gas flow is relatively low, and it is easy to form a local low velocity region M. Both theoretical and experimental results demonstrate that the possibility of urea crystallization occurring in the low velocity zone M is extremely high.
因此，有必要提供一种新型的解决方案以解决上述技术难题。Therefore, it is necessary to provide a new type of solution 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抗结晶能力较强的发动机排气后处理封装以及一种细纤维元件在该发动机排气后处理封装中的应用。It is an object of the present invention to provide an engine exhaust aftertreatment package that is more resistant to crystallization and to the use of a fine fiber component in the engine exhaust aftertreatment package.
为实现上述目的，本发明采用如下技术方案：一种发动机排气后处理封装，其包括第一后处理组件、与所述第一后处理组件连通的第一混合腔组件以及与所述第一混合腔组件连通的混合管，其中所述混合管包括至少部分位于所述第一混合腔组件中的旋流管，所述旋流管包括中空的内腔体以及围绕在所述内腔体的***且沿周向分布的若干翅片，所述第一混合腔组件包括用以安装尿素喷嘴的安装座，所述尿素喷嘴用以向所述混合管中喷射雾化的尿素液滴，所述发动机排气后处理封装还包括位于所述混合管中的细纤维元件，其中所述细纤维元件用以供所述排气以及所述尿素液滴穿过，以进一步增加所述尿素液滴的破碎以及蒸发。To achieve the above object, the present invention adopts the following technical solution: an engine exhaust aftertreatment package including a first aftertreatment component, a first mixing cavity component in communication with the first aftertreatment component, and the first a mixing tube in communication with the mixing chamber assembly, wherein the mixing tube includes a swirl tube at least partially located in the first mixing chamber assembly, the swirl tube including a hollow inner chamber and surrounding the inner chamber a plurality of fins circumferentially and circumferentially distributed, the first mixing chamber assembly including a mount for mounting a urea nozzle for injecting atomized urea droplets into the mixing tube, The engine exhaust aftertreatment package further includes a fine fiber element located in the mixing tube, wherein the fine fiber element is used to pass the exhaust gas and the urea droplets to further increase the urea droplets Broken and evaporated.
作为本发明进一步改进的技术方案，所述旋流管包括对应于所述若干翅片且与所述内腔体连通的若干开槽、以及位于所述翅片的一侧且靠近所述安装座的若干开孔。As a further improved technical solution of the present invention, the swirl tube includes a plurality of slots corresponding to the plurality of fins and communicating with the inner cavity, and is located at one side of the fin and adjacent to the mount Several openings.
作为本发明进一步改进的技术方案，所述旋流管呈锥形。As a further improved technical solution of the present invention, the swirl tube is tapered.
作为本发明进一步改进的技术方案，所述混合管包括与所述旋流管相连接的连接管，所述细纤维元件位于所述连接管中。As a further improved technical solution of the present invention, the mixing tube comprises a connecting tube connected to the swirl tube, and the fine fiber element is located in the connecting tube.
作为本发明进一步改进的技术方案，所述细纤维元件为钢丝绒或者泡沫金属。As a further improved technical solution of the present invention, the fine fiber element is steel wool or foam metal.
作为本发明进一步改进的技术方案，所述发动机排气后处理封装设有固定所述细纤维元件的若干固定棒。As a further improved technical solution of the present invention, the engine exhaust aftertreatment package is provided with a plurality of fixing bars for fixing the fine fiber elements.
作为本发明进一步改进的技术方案，所述发动机排气后处理封装还包括与所述第一后处理组件并排布置的第二后处理组件以及与所述第二后处理组件连通的第二混合腔组件，所述混合管连接在所述第一混合腔组件以及所述第二混合腔组件之间；所述第一后处理组件与所述第二后处理组件藉由所述第一混合腔组件、所述混合管以及所述第二混合腔组件实现串联。As a further improved technical solution of the present invention, the engine exhaust aftertreatment package further includes a second aftertreatment component disposed side by side with the first aftertreatment component and a second mixing cavity in communication with the second aftertreatment component An assembly, the mixing tube being coupled between the first mixing chamber assembly and the second mixing chamber assembly; the first aftertreatment assembly and the second aftertreatment assembly being coupled by the first mixing chamber assembly The mixing tube and the second mixing chamber assembly are connected in series.
作为本发明进一步改进的技术方案，所述第一后处理组件包括柴油氧化催化剂及/或柴油颗粒捕集器，所述第二后处理组件包括选择性催化还原剂。As a further improved technical solution of the present invention, the first aftertreatment component comprises a diesel oxidation catalyst and/or a diesel particulate trap, and the second aftertreatment component comprises a selective catalytic reducing agent.
本发明还涉及一种细纤维元件在上述发动机排气后处理封装中的应用。The invention further relates to the use of a fine fiber element in the above described engine exhaust aftertreatment package.
相较于现有技术，本发明通过设置细纤维元件，使尿素液滴在细纤维元件的表面和内部发生充分的破碎与混合。另外，由于细纤维元件的线径较小，空隙复杂，传热面积大，有利于尿素液滴与排气发生较充分的换热，从而利于尿素液滴的蒸发和热解，提高了抗结晶能力。Compared with the prior art, the present invention allows the urea droplets to be sufficiently broken and mixed on the surface and inside of the fine fiber member by providing the fine fiber member. In addition, due to the small wire diameter of the fine fiber element, the void is complicated, and the heat transfer area is large, which is beneficial to the full heat exchange between the urea droplets and the exhaust gas, thereby facilitating evaporation and pyrolysis of the urea droplets, and improving the anti-crystallization. ability.
附图说明DRAWINGS
图1是现有技术中在混合管内增加多孔板的剖面示意图。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view showing the addition of a perforated plate in a mixing tube in the prior art.
图2是图1中多孔板的剖面示意图，其中标明的排气与尿素液滴的混合物的流向以及背面的死区。Figure 2 is a schematic cross-sectional view of the perforated plate of Figure 1 with the flow direction of the mixture of exhaust gas and urea droplets and the dead zone on the back side.
图3是本发明发动机排气后处理封装的立体示意图。3 is a perspective view of the engine exhaust aftertreatment package of the present invention.
图4是图3的部分立体分解图。Fig. 4 is a partially exploded perspective view of Fig. 3;
图5是图4进一步的立体分解图。Figure 5 is a further exploded perspective view of Figure 4.
图6是图5中第一混合腔组件与混合管的左视图。Figure 6 is a left side elevational view of the first mixing chamber assembly and mixing tube of Figure 5.
图7是图5中第一混合腔组件与混合管的右视图。Figure 7 is a right side elevational view of the first mixing chamber assembly and mixing tube of Figure 5.
图8是图5中第一混合腔组件与混合管的主视图。Figure 8 is a front elevational view of the first mixing chamber assembly and mixing tube of Figure 5.
图9是图6中A-A线的剖面示意图。Figure 9 is a schematic cross-sectional view taken along line A-A of Figure 6.
图10是混合管以及细纤维元件的立体示意图。Figure 10 is a schematic perspective view of a mixing tube and a fine fiber element.
图11是图5中第一混合腔组件与混合管的立体分解图。Figure 11 is an exploded perspective view of the first mixing chamber assembly and mixing tube of Figure 5.
具体实施方式Detailed ways
请参图3至图11所示，本发明揭示了一种发动机排气后处理封装100，用于例如SCR等后处理***中以处理发动机的尾气。在本发明图示的实施方式中，所述发动机排气后处理封装100包括第一后处理组件1、与所述第一后处理组件1连通的第一混合腔组件2、与所述第一后处理组件1并排布置的第二后处理组件3、与所述第二后处理组件3连通的第二混合腔组件4、以及连通所述第一、第二混合腔组件2、4的混合管5。所述第一后处理组件1与所述第二后处理组件3藉由所述第一、第二混合腔组件2、4以及所述混合管5实现串联。Referring to Figures 3 through 11, the present invention discloses an engine exhaust aftertreatment package 100 for use in an aftertreatment system such as an SCR to treat the exhaust of the engine. In the illustrated embodiment of the present invention, the engine exhaust aftertreatment package 100 includes a first aftertreatment assembly 1 , a first mixing chamber assembly 2 in communication with the first aftertreatment assembly 1 , and the first a second aftertreatment assembly 3 in which the aftertreatment assembly 1 is arranged side by side, a second mixing chamber assembly 4 in communication with the second aftertreatment assembly 3, and a mixing tube that communicates the first and second mixing chamber assemblies 2, 4 5. The first aftertreatment component 1 and the second aftertreatment component 3 are connected in series by the first and second mixing chamber assemblies 2, 4 and the mixing tube 5.
在本发明图示的实施方式中，所述第一后处理组件1包括第一壳体11、第二壳体12、安装于所述第一壳体11内的氧化型催化转换器(DOC)、安装于所述第二壳体12内的颗粒捕集器(DPF)、以及位于所述氧化型催化转换器上游的排气进口15。其中，所述氧化型催化转换器位于所述颗粒捕集器的上游，以在所述颗粒捕集器再生时提供合适的温度。In the illustrated embodiment of the present invention, the first aftertreatment assembly 1 includes a first housing 11, a second housing 12, and an oxidation type catalytic converter (DOC) installed in the first housing 11. a particulate trap (DPF) installed in the second casing 12, and an exhaust inlet 15 upstream of the oxidizing catalytic converter. Wherein the oxidizing catalytic converter is located upstream of the particle trap to provide a suitable temperature when the particulate trap is regenerated.
在本发明图示的实施方式中，所述第二后处理组件3包括第三壳体31、安装于所述第三壳体31内的选择性催化还原剂(SCR)32以及位于所述选择性催化还原剂32下游的排气出口33。In the illustrated embodiment of the invention, the second aftertreatment assembly 3 includes a third housing 31, a selective catalytic reducing agent (SCR) 32 mounted within the third housing 31, and the selection The exhaust outlet 33 downstream of the catalytic reducing agent 32.
在本发明图示的实施方式中，所述第一混合腔组件2与所述第二混合腔组件4的形状大致相 同。所述第一混合腔组件2用以将来自所述第一后处理组件1的排气导向所述混合管5。所述第一混合腔组件2在正对所述混合管5的位置设有用以安装尿素喷嘴(未图示)的安装座21，所述尿素喷嘴用以向所述混合管5中喷射雾化的尿素液滴。In the illustrated embodiment of the invention, the first mixing chamber assembly 2 and the second mixing chamber assembly 4 are substantially identical in shape. The first mixing chamber assembly 2 is for directing exhaust gas from the first aftertreatment assembly 1 to the mixing tube 5. The first mixing chamber assembly 2 is provided at a position facing the mixing tube 5 with a mounting seat 21 for mounting a urea nozzle (not shown) for injecting atomization into the mixing tube 5 Urea droplets.
所述混合管5包括至少部分位于所述第一混合腔组件2中的旋流管51以及与所述旋流管51相连接的连接管52。在本发明图示的实施方式中，所述旋流管51呈锥形，其包括中空的内腔体511、围绕在所述内腔体511的***且沿周向分布的若干翅片512、对应于所述若干翅片512且与所述内腔体511连通的若干开槽513、以及位于所述翅片512的一侧且靠近安装座21的若干开孔514。在本发明图示的实施方式中，所述翅片512能够形成旋流的混合效果，从而增加了混合距离，降低了尿素结晶的风险。The mixing tube 5 comprises a swirl tube 51 at least partially located in the first mixing chamber assembly 2 and a connecting tube 52 connected to the swirl tube 51. In the illustrated embodiment of the present invention, the swirl tube 51 is tapered, and includes a hollow inner cavity 511, a plurality of fins 512 surrounding the periphery of the inner cavity 511 and distributed in the circumferential direction, A plurality of slots 513 corresponding to the plurality of fins 512 and in communication with the inner cavity 511, and a plurality of openings 514 on one side of the fin 512 and adjacent to the mounting seat 21. In the illustrated embodiment of the invention, the fins 512 are capable of forming a mixing effect of the swirl, thereby increasing the mixing distance and reducing the risk of urea crystallization.
所述发动机排气后处理封装100还包括位于所述混合管5中的细纤维元件6，其中所述细纤维元件6用以供所述排气以及所述尿素液滴穿过，以进一步增加所述尿素液滴的破碎以及蒸发。在本发明图示的实施方式中，所述细纤维元件6为钢丝绒或者泡沫金属，所述细纤维元件6位于所述连接管52内。所述发动机排气后处理封装100设有固定所述细纤维元件6的若干固定棒7。当然在其他实施方式中，所述细纤维元件6也可以是网状钢丝或者陶瓷的多孔材料等。The engine exhaust aftertreatment package 100 further includes a fine fiber element 6 located in the mixing tube 5, wherein the fine fiber element 6 is used to pass the exhaust gas and the urea droplets to further increase The urea droplets are broken and evaporated. In the illustrated embodiment of the invention, the fine fiber element 6 is steel wool or foam metal, and the fine fiber element 6 is located within the connecting tube 52. The engine exhaust aftertreatment package 100 is provided with a plurality of fixing bars 7 that fix the fine fiber elements 6. Of course, in other embodiments, the fine fiber element 6 may also be a mesh steel wire or a ceramic porous material or the like.
本发明利用细纤维元件6(例如钢丝绒)的3D多孔结构或者多空隙结构，排气以及所述尿素液滴穿过该细纤维元件6，使尿素液滴在钢丝绒的表面和内部发生充分的破碎与混合。另外，钢丝绒的线径较小，空隙复杂，比表面积大。因为比表面积大，在有限的空间内能够创造出更大的换热面积，有利于尿素液滴与排气发生较充分的换热，从而利于尿素液滴的蒸发和热解，提高了抗结晶能力。通过对细纤维元件6的密度的调节可以相应地调整***的背压。The present invention utilizes a 3D porous structure or a multi-voided structure of a fine fiber element 6 (e.g., steel wool), the exhaust gas and the urea droplets pass through the fine fiber element 6, so that the urea droplets are sufficiently formed on the surface and inside of the steel wool. Broken and mixed. In addition, the steel wool has a small wire diameter, a complicated void, and a large specific surface area. Because of its large specific surface area, it can create a larger heat exchange area in a limited space, which is beneficial to the full heat exchange between urea droplets and exhaust gas, which facilitates evaporation and pyrolysis of urea droplets and improves resistance to crystallization. ability. The back pressure of the system can be adjusted accordingly by adjusting the density of the fine fiber element 6.
相较于现有技术中的多孔管与翅片等结构，本发明的细纤维元件6的线径都非常小(例如小于1mm)，因此可以避免背风面的出现，从而降低尿素结晶风险。本发明的这种开拓性的发明既解决了低速区的问题，又解决了换热的问题，具有突出的实质性特点和显著的进步。Compared with the structures of the porous tube and the fins in the prior art, the wire diameter of the fine fiber element 6 of the present invention is very small (for example, less than 1 mm), so that the occurrence of the leeward side can be avoided, thereby reducing the risk of urea crystallization. The pioneering invention of the present invention solves both the problem of the low speed zone and the heat exchange problem, with outstanding substantial features and significant progress.
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 (9)

  1. 一种发动机排气后处理封装，其包括第一后处理组件、与所述第一后处理组件连通的第一混合腔组件以及与所述第一混合腔组件连通的混合管，其中所述混合管包括至少部分位于所述第一混合腔组件中的旋流管，所述旋流管包括中空的内腔体以及围绕在所述内腔体的***且沿周向分布的若干翅片，所述第一混合腔组件包括用以安装尿素喷嘴的安装座，所述尿素喷嘴用以向所述混合管中喷射雾化的尿素液滴，其特征在于：所述发动机排气后处理封装还包括位于所述混合管中的细纤维元件，其中所述细纤维元件用以供所述排气以及所述尿素液滴穿过，以进一步增加所述尿素液滴的破碎以及蒸发。An engine exhaust aftertreatment package including a first aftertreatment assembly, a first mixing chamber assembly in communication with the first aftertreatment assembly, and a mixing tube in communication with the first mixing chamber assembly, wherein the mixing The tube includes a swirl tube at least partially located in the first mixing chamber assembly, the swirl tube including a hollow inner chamber and a plurality of fins distributed around the periphery of the inner chamber and circumferentially distributed The first mixing chamber assembly includes a mount for mounting a urea nozzle for injecting atomized urea droplets into the mixing tube, wherein the engine exhaust aftertreatment package further includes A fine fiber element located in the mixing tube, wherein the fine fiber element is used to pass the exhaust gas and the urea droplets to further increase crushing and evaporation of the urea droplets.
  2. 如权利要求1所述的发动机排气后处理封装，其特征在于：所述旋流管包括对应于所述若干翅片且与所述内腔体连通的若干开槽、以及位于所述翅片的一侧且靠近所述安装座的若干开孔。The engine exhaust aftertreatment package of claim 1 wherein said swirl tube includes a plurality of slots corresponding to said plurality of fins and in communication with said inner cavity, and said fins One side of the one and close to the opening of the mount.
  3. 如权利要求1所述的发动机排气后处理封装，其特征在于：所述旋流管呈锥形。The engine exhaust aftertreatment package of claim 1 wherein said swirl tube is tapered.
  4. 如权利要求1所述的发动机排气后处理封装，其特征在于：所述混合管包括与所述旋流管相连接的连接管，所述细纤维元件位于所述连接管中。The engine exhaust aftertreatment package of claim 1 wherein said mixing tube includes a connecting tube coupled to said swirl tube, said fine fiber member being located in said connecting tube.
  5. 如权利要求1所述的发动机排气后处理封装，其特征在于：所述细纤维元件为钢丝绒或者泡沫金属。The engine exhaust aftertreatment package of claim 1 wherein said fine fiber component is steel wool or metal foam.
  6. 如权利要求1所述的发动机排气后处理封装，其特征在于：所述发动机排气后处理封装设有固定所述细纤维元件的若干固定棒。The engine exhaust aftertreatment package of claim 1 wherein said engine exhaust aftertreatment package is provided with a plurality of fixed bars that secure said fine fiber elements.
  7. 如权利要求1所述的发动机排气后处理封装，其特征在于：所述发动机排气后处理封装还包括与所述第一后处理组件并排布置的第二后处理组件以及与所述第二后处理组件连通的第二混合腔组件，所述混合管连接在所述第一混合腔组件以及所述第二混合腔组件之间；所述第一后处理组件与所述第二后处理组件藉由所述第一混合腔组件、所述混合管以及所述第二混合腔组件实现串联。The engine exhaust aftertreatment package of claim 1 wherein said engine exhaust aftertreatment package further comprises a second aftertreatment component disposed alongside said first aftertreatment component and said second a second mixing chamber assembly in communication with the aftertreatment assembly, the mixing tube being coupled between the first mixing chamber assembly and the second mixing chamber assembly; the first aftertreatment assembly and the second aftertreatment assembly The series connection is achieved by the first mixing chamber assembly, the mixing tube, and the second mixing chamber assembly.
  8. 如权利要求7所述的发动机排气后处理封装，其特征在于：所述第一后处理组件包括柴油氧化催化剂及/或柴油颗粒捕集器，所述第二后处理组件包括选择性催化还原剂。The engine exhaust aftertreatment package of claim 7 wherein said first aftertreatment component comprises a diesel oxidation catalyst and/or a diesel particulate trap, said second aftertreatment component comprising a selective catalytic reduction Agent.
  9. 一种细纤维元件在发动机排气后处理封装中的应用，其特征在于，所述发动机排气后处理封装为权利要求1至8项中任意一项所述的发动机排气后处理封装。A use of a fine fiber element in an engine exhaust aftertreatment package, characterized in that the engine exhaust aftertreatment package is the engine exhaust aftertreatment package of any one of claims 1 to 8.
PCT/CN2018/084373 2017-07-27 2018-04-25 Engine exhaust after-treatment package and application thereof WO2019019724A1 (en)

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