WO2019019726A1 - 发动机排气后处理混合装置及其后处理装置与应用 - Google Patents

发动机排气后处理混合装置及其后处理装置与应用 Download PDF

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Publication number
WO2019019726A1
WO2019019726A1 PCT/CN2018/084376 CN2018084376W WO2019019726A1 WO 2019019726 A1 WO2019019726 A1 WO 2019019726A1 CN 2018084376 W CN2018084376 W CN 2018084376W WO 2019019726 A1 WO2019019726 A1 WO 2019019726A1
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Prior art keywords
engine exhaust
mixing
exhaust aftertreatment
mixing device
fine fiber
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PCT/CN2018/084376
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English (en)
French (fr)
Inventor
李军良
王天宇
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天纳克（苏州）排放系统有限公司
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Publication of WO2019019726A1 publication Critical patent/WO2019019726A1/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
    • 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 mixing device and a post-processing device and application thereof, 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 object of the present invention is to provide an engine exhaust aftertreatment mixing device with high crystallization resistance, an application of a fine fiber element in the engine exhaust aftertreatment mixing device, and an engine exhaust aftertreatment with the mixing device Device.
  • an engine exhaust aftertreatment mixing device including a mount for mounting a urea nozzle and a mixing element for exhausting the engine to the exhaust after treatment Spraying atomized urea droplets in a mixing device for mixing the urea droplets with exhaust gas, the mixing element comprising a mixing tube, the mixing tube being provided with a plurality of swirling fins,
  • the engine exhaust aftertreatment mixing device further includes a fine fiber element at a bottom of the mixing tube, wherein the fine fiber element is used to pass the exhaust gas and the urea droplets to further increase the urea liquid The droplets are broken and evaporated.
  • the engine exhaust after-treatment mixing device includes a housing formed or fixed on the housing; the urea nozzle is configured to spray mist into the mixing tube Urea droplets.
  • the mixing element further includes a partition sleeved around the mixing tube and located in the housing to partition the housing into one side of the partition a first cavity and a second cavity on the other side of the spacer, the swirling vane being in communication with the first cavity.
  • the mixing tube is further provided with a plurality of perforations located above the swirling sheet and close to the mounting seat.
  • the mixing tube has a hollow cylindrical shape
  • the partition plate includes a first vertical portion, a second vertical portion, and the first vertical portion and the second portion a horizontal portion of the vertical portion, wherein the horizontal portion is provided with an opening through which the mixing tube passes.
  • the fine fiber element is steel wool or foam metal, and the fine fiber element is located in the mixing tube.
  • the engine exhaust aftertreatment mixing device is provided with a plurality of fixing bars for fixing the fine fiber elements.
  • the invention further relates to the use of a fine fiber element in the above described engine exhaust aftertreatment mixing device.
  • the present invention also relates to an engine exhaust aftertreatment device comprising the above described engine exhaust aftertreatment mixing device and a selective catalytic reducing agent (SCR) located downstream of the engine exhaust aftertreatment mixing device.
  • SCR selective catalytic reducing agent
  • the engine exhaust aftertreatment device further includes a diesel oxidation catalyst (DOC) and a diesel particulate trap (DPF) located upstream of the engine exhaust aftertreatment mixing device and sequentially connected in series. ).
  • DOC diesel oxidation catalyst
  • DPF diesel particulate trap
  • 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.
  • Figure 3 is a perspective view of the engine exhaust aftertreatment device 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 perspective view of the engine exhaust aftertreatment mixing device of Figure 5.
  • Figure 7 is a left side view of Figure 6.
  • Figure 8 is a right side view of Figure 6.
  • Figure 9 is a schematic cross-sectional view taken along line A-A of Figure 6.
  • Fig. 10 is an exploded perspective view of Fig. 6;
  • Figure 11 is an exploded perspective view of another angle of Figure 10.
  • Figure 12 is a perspective view of the portion of the housing of Figure 6 removed.
  • Figure 13 is a perspective view of the fine fiber element of Figure 10.
  • the present invention discloses an engine exhaust aftertreatment device 100 for use in an aftertreatment system such as an SCR to treat the exhaust of the engine.
  • the engine exhaust aftertreatment device 100 includes an engine exhaust aftertreatment mixing device 10, a diesel oxidation catalyst (DOC) 20 located in series upstream of the engine exhaust aftertreatment mixing device 10, and a diesel particulate trap. (DPF) 30, and a selective catalytic reducing agent (SCR) 40 located downstream of the engine exhaust aftertreatment mixing device 10.
  • DOC diesel oxidation catalyst
  • DPF diesel particulate trap
  • SCR selective catalytic reducing agent
  • the engine exhaust aftertreatment mixing device 10 includes a housing 1, a mixing element 2 mounted in the housing 1, and a fine fiber element 3 for further increasing evaporation and pyrolysis of urea droplets.
  • the housing 1 has a cylindrical shape, and is provided with a mounting plate 11 recessed into the housing 1 and a mounting seat 12 formed or fixed to the housing 1. .
  • the mount 12 is welded to the mounting plate 11.
  • the mixing element 2 is located downstream of the mount 12 in the direction of exhaust gas flow.
  • the mount 12 is for mounting a urea nozzle (not shown) for injecting atomized urea droplets into the engine exhaust aftertreatment mixing device 10.
  • the mixing element 2 is used to mix the urea droplets with the exhaust gases.
  • the mixing element 2 comprises a mixing tube 21 and a partition 22 that is sleeved around the mixing tube 21 and located in the housing 1.
  • the urea nozzle is used to inject atomized urea droplets into the mixing tube 21.
  • the partition 22 partitions the casing 1 into a first cavity 110 located at one side of the partition 22 and at the partition.
  • the second cavity 120 on the other side of the plate 22.
  • the mixing tube 21 has a hollow cylindrical shape, and is provided with a swirling sheet 211 communicating with the first cavity 110 and a plurality of perforations 212 located above the swirling sheet 211 and adjacent to the mounting seat 12 .
  • the swirling sheet 211 is capable of forming a mixing effect of the swirling flow, thereby increasing the mixing distance and reducing the risk of urea crystallization.
  • the partition plate 22 includes a first vertical portion 221, a second vertical portion 222, and a horizontal portion 223 connecting the first vertical portion 221 and the second vertical portion 222, wherein the horizontal portion 223 is provided There is an opening 224 through which the mixing tube 21 passes.
  • the fine fiber element 3 is steel wool or metal foam, and the fine fiber element 3 is located in the mixing tube 21.
  • the engine exhaust aftertreatment mixing device 10 is provided with a plurality of fixed bars 4 for fixing the steel wool.
  • the fine fiber element 3 may 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 3 (for example, steel wool), and exhaust gas and the urea droplets pass through the fine fiber element 3, so that urea droplets are sufficiently generated 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 3.
  • the wire diameter of the fine fiber element 3 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

一种发动机排气后处理混合装置（10），包括用以安装尿素喷嘴的安装座（12）以及混合元件（2）。混合元件（2）用以将尿素液滴与排气进行混合，混合元件（2）包括混合管（21），混合管（21）设有若干旋流片（211），还包括位于混合管（21）的底部的细纤维元件（3），其中细纤维元件（3）用以供排气以及尿素液滴穿过，以进一步增加尿素液滴的破碎以及蒸发。该发动机排气后处理混合装置（10）具有较强的尿素抗结晶能力。还提供了一种细纤维元件在发动机排气后处理混合装置中的应用以及一种发动机排气后处理装置。

Description

发动机排气后处理混合装置及其后处理装置与应用
本申请要求了申请日为2017年7月27日、申请号为201710624153.7、发明名称为“发动机排气后处理混合装置及其后处理装置与应用”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。
技术领域
本发明涉及一种发动机排气后处理混合装置及其后处理装置与应用，属于发动机排气后处理技术领域。
背景技术
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。
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。
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。
发明内容
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混合装置、一种细纤维元件在该发动机排气后处理混合装置中的应用以及具有该混合装置的发动机排气后处理装置。
为实现上述目的，本发明采用如下技术方案：一种发动机排气后处理混合装置，其包括用以安装尿素喷嘴的安装座以及混合元件，所述尿素喷嘴用以向所述发动机排气后处理混合装置中喷射雾化的尿素液滴，所述混合元件用以将所述尿素液滴与排气进行混合，所述混合元件包括混合管，所述混合管设有若干旋流片，所述发动机排气后处理混合装置还包括位于所述混合管的底部的细纤维元件，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。
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混合装置包括壳体，所述安装座形成或者固定于所述壳体上；所述尿素喷嘴用以向所述混合管中喷射雾化的尿素液滴。
作为本发明进一步改进的技术方案，所述混合元件还包括套接在所述混合管外围且位于所述壳体中的隔板，以将所述壳体隔成位于所述隔板的一侧的第一腔体以及位于所述隔板的另一侧的第二腔体，所述旋流片与所述第一腔体相连通。
作为本发明进一步改进的技术方案，所述混合管还设有位于所述旋流片的上方且靠近所述安装座的若干穿孔。
作为本发明进一步改进的技术方案，所述混合管呈中空的圆筒状，所述隔板包括第一竖直部、第二竖直部以及连接所述第一竖直部与所述第二竖直部的水平部，其中所述水平部设有供所述混合管穿过的开孔。
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，所述细纤维元件位于所述混合管内。
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混合装置设有固定所述细纤维元件的若干固定棒。
本发明还涉及一种细纤维元件在上述发动机排气后处理混合装置中的应用。
本发明还涉及一种发动机排气后处理装置，其包括上述的发动机排气后处理混合装置以及位于所述发动机排气后处理混合装置的下游的选择性催化还原剂(SCR)。
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装置还包括位于所述发动机排气后 处理混合装置的上游且依次串联的柴油氧化催化器(DOC)以及柴油颗粒捕集器(DPF)。
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。
附图说明
图1是现有技术中在混合管内增加多孔板的剖面示意图。
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。
图3是本发明发动机排气后处理装置的立体示意图。
图4是图3的部分立体分解图。
图5是图4进一步的立体分解图。
图6是图5中发动机排气后处理混合装置的立体图。
图7是图6的左视图。
图8是图6的右视图。
图9是图6中A-A线的剖面示意图。
图10是图6的立体分解图。
图11是图10另一角度的立体分解图。
图12是去除图6中的部分壳体后的立体图。
图13是图10中细纤维元件的立体示意图。
具体实施方式
请参图3至图13所示，本发明揭示了一种发动机排气后处理装置100，用于例如SCR等后处理系统中以处理发动机的尾气。所述发动机排气后处理装置100包括发动机排气后处理混合装置10、位于所述发动机排气后处理混合装置10的上游且依次串联的柴油氧化催化器(DOC)20以及柴油颗粒捕集器(DPF)30、以及位于所述发动机排气后处理混合装置10的下游的选择性催化还原剂(SCR)40。
所述发动机排气后处理混合装置10包括壳体1、安装于所述壳体1内的混合元件2以及用以 进一步增加尿素液滴蒸发和热解的细纤维元件3。
在本发明图示的实施方式中，所述壳体1呈圆筒状，其设有向所述壳体1内凹陷的安装板11以及形成或者固定于所述壳体1上的安装座12。在本发明图示的实施方式中，所述安装座12焊接在所述安装板11上。所述混合元件2沿排气流动方向位于所述安装座12的下游。所述安装座12用以安装尿素喷嘴(未图示)，以向所述发动机排气后处理混合装置10中喷射雾化的尿素液滴。
所述混合元件2用以将所述尿素液滴与排气进行混合。在本发明图示的实施方式中，所述混合元件2包括混合管21以及套接在所述混合管21外围且位于所述壳体1中的隔板22。所述尿素喷嘴用以向所述混合管21中喷射雾化的尿素液滴。请参图9所示，在本发明图示的实施方式中，所述隔板22将所述壳体1隔成位于所述隔板22的一侧的第一腔体110以及位于所述隔板22的另一侧的第二腔体120。
所述混合管21呈中空的筒状，其设有与所述第一腔体110相连通的旋流片211以及位于所述旋流片211的上方且靠近所述安装座12的若干穿孔212。在本发明图示的实施方式中，所述旋流片211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。
所述隔板22包括第一竖直部221、第二竖直部222以及连接所述第一竖直部221与所述第二竖直部222的水平部223，其中所述水平部223设有供所述混合管21穿过的开孔224。
请参图13所示，在本发明图示的实施方式中，所述细纤维元件3为钢丝绒或者泡沫金属，所述细纤维元件3位于所述混合管21内。所述发动机排气后处理混合装置10设有固定所述钢丝绒的若干固定棒4。当然在其他实施方式中，所述细纤维元件3也可以是网状钢丝或者陶瓷的多孔材料等。
本发明利用细纤维元件3(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3，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3的密度的调节可以相应地调整系统的背压。
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3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。
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. 一种发动机排气后处理混合装置，其包括用以安装尿素喷嘴的安装座以及混合元件，所述尿素喷嘴用以向所述发动机排气后处理混合装置中喷射雾化的尿素液滴，所述混合元件用以将所述尿素液滴与排气进行混合，所述混合元件包括混合管，所述混合管设有若干旋流片，其特征在于：所述发动机排气后处理混合装置还包括位于所述混合管的底部的细纤维元件，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。
  2. 如权利要求1所述的发动机排气后处理混合装置，其特征在于：所述发动机排气后处理混合装置包括壳体，所述安装座形成或者固定于所述壳体上；所述尿素喷嘴用以向所述混合管中喷射雾化的尿素液滴。
  3. 如权利要求2所述的发动机排气后处理混合装置，其特征在于：所述混合元件还包括套接在所述混合管外围且位于所述壳体中的隔板，以将所述壳体隔成位于所述隔板的一侧的第一腔体以及位于所述隔板的另一侧的第二腔体，所述旋流片与所述第一腔体相连通。
  4. 如权利要求3所述的发动机排气后处理混合装置，其特征在于：所述混合管还设有位于所述旋流片的上方且靠近所述安装座的若干穿孔。
  5. 如权利要求3所述的发动机排气后处理混合装置，其特征在于：所述混合管呈中空的圆筒状，所述隔板包括第一竖直部、第二竖直部以及连接所述第一竖直部与所述第二竖直部的水平部，其中所述水平部设有供所述混合管穿过的开孔。
  6. 如权利要求1所述的发动机排气后处理混合装置，其特征在于：所述细纤维元件为钢丝绒或者泡沫金属，所述细纤维元件位于所述混合管内。
  7. 如权利要求6所述的发动机排气后处理混合装置，其特征在于：所述发动机排气后处理混合装置设有固定所述细纤维元件的若干固定棒。
  8. 一种细纤维元件在发动机排气后处理混合装置中的应用，其特征在于，所述发动机排气后处理混合装置为权利要求1至7项中任意一项所述的发动机排气后处理混合装置。
  9. 一种发动机排气后处理装置，其包括如权利要求1至7项中任意一项所述的发动机排气后处理混合装置以及位于所述发动机排气后处理混合装置的下游的选择性催化还原剂(SCR)。
  10. 如权利要求9所述的发动机排气后处理装置，其特征在于：所述发动机排气后处理装置还包括位于所述发动机排气后处理混合装置的上游且依次串联的柴油氧化催化器(DOC)以及柴油颗粒捕集器(DPF)。
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