WO2019011036A1 - 尾气后处理混合装置及其封装 - Google Patents

尾气后处理混合装置及其封装 Download PDF

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Publication number
WO2019011036A1
WO2019011036A1 PCT/CN2018/084388 CN2018084388W WO2019011036A1 WO 2019011036 A1 WO2019011036 A1 WO 2019011036A1 CN 2018084388 W CN2018084388 W CN 2018084388W WO 2019011036 A1 WO2019011036 A1 WO 2019011036A1
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WO
WIPO (PCT)
Prior art keywords
space
mixing device
curved wall
exhaust gas
edge
Prior art date
Application number
PCT/CN2018/084388
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English (en)
French (fr)
Inventor
王聪
王林
王平
Original Assignee
天纳克（苏州）排放***有限公司
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Application filed by 天纳克（苏州）排放***有限公司 filed Critical 天纳克（苏州）排放***有限公司
Priority to US16/629,314 priority Critical patent/US10704448B2/en
Publication of WO2019011036A1 publication Critical patent/WO2019011036A1/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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • 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
    • 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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/421—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an exhaust gas post-treatment mixing device and a package thereof, and belongs to the technical field of engine exhaust gas post-treatment.
  • the uniformity of ammonia distribution in the exhaust gas aftertreatment system (eg, selective catalytic reduction system, SCR system) has an important impact on the overall performance and durability of the system. If the ammonia distribution is uneven, it will lead to excessive ammonia in the local area and easy to cause ammonia leakage, while in other thin ammonia regions, the nitrogen oxide (NOx) conversion efficiency is too low. Uneven distribution of ammonia over a long period of time can result in uneven aging of the catalyst, thereby affecting the overall performance of the catalyst. In addition, the uneven distribution of urea droplets may cause the local tube wall or mixed structure temperature to be too low to form crystallization, which may block the tail gas pipe when severe, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • an exhaust gas after-treatment mixing device comprising a casing and a mixing assembly located in the casing, wherein the casing is provided to install a urea nozzle to the mixing a mount for injecting urea in the assembly, the mixing assembly including a first plate, a second plate, and a mixer between the first plate and the second plate, wherein the first plate Providing a first inlet and a second inlet respectively on both sides, the mixer comprising a first space communicating with the first inlet, a second space communicating with the second inlet, and the first space and the a third space between the second spaces, the top of the first space is in communication with the third space, and the top of the second space is also in communication with the third space; the mixer is provided Projecting from the bottom into the first ridge in the third space, the mixer further having a second ridge below the first ridge to be in the first ridge and the first Forming a fourth space between the two ridges;
  • the mixer is provided with a first curved wall and a first partition wall cooperating with the first curved wall, the first space is located at the first curved wall Between the first partition wall and the first partition wall.
  • the first partition wall is provided with a first fixing portion fixed to the bottom of the first curved wall and a first extending arm located inside the first curved wall; A first swirling direction is defined between the first curved wall and the first dividing wall.
  • the mixer is provided with a second curved wall and a second dividing wall cooperating with the second curved wall, and the second space is located at the second curved wall Between the second partition wall.
  • the second partition wall is provided with a second fixing portion fixed to the bottom of the second curved wall and a second extending arm located inside the second curved wall.
  • a second swirling direction is defined between the second curved wall and the second dividing wall, wherein the first swirling direction is one of clockwise or counterclockwise, and the second swirling direction is The other one of clockwise or counterclockwise.
  • the first swirling direction and the second swirling direction are both in a cross section of the casing; the fourth space further defines a cross section a third swirling direction and a fourth swirling direction, wherein the third swirling direction is substantially the same as the first swirling direction, and the fourth swirling direction is substantially the same as the second swirling direction.
  • the first ridge portion includes a first top edge connecting the first side edge and the second side edge, and an extension portion extending outward from a bottom portion of the first side edge a bottom edge and a second bottom edge extending outward from a bottom of the second side;
  • the second raised portion includes a third side, a fourth side opposite the third side, a connection a third top edge of the third side and the fourth side, a third bottom edge extending outward from a bottom of the third side, and a first extending outward from a bottom of the fourth side Four bottoms.
  • the angle between the first side edge and the second side edge is an acute angle
  • the first top edge, the first bottom edge, and the second bottom edge are all arcuate.
  • the first ridge portion has the same shape as the second ridge portion; the angle between the third side edge and the fourth side edge is an acute angle, and the second top portion The sides, the third bottom edge, and the fourth bottom edge are all arcuate.
  • the third bottom edge and the fourth bottom edge are fixed to the inner side of the casing.
  • the first space, the second space, the third space, and the fourth space are blocked by the second plate in an exhaust gas entering direction, so that Most of the airflow must be rotated from the first and second spaces into the third space and flow in a double swirl to the outlet in the fourth space.
  • the first raised portion, the first curved wall and the second curved wall are formed by bending a single piece, and are substantially ⁇ -shaped as a whole.
  • the outlet includes a first outlet and a second outlet respectively located on both sides.
  • the first outlet and the second outlet are both located at the edge of the second plate.
  • the first plate is provided with a gap that communicates with the fourth space.
  • the urea nozzle is used to spray atomized urea droplets into the third space.
  • the invention further relates to an exhaust aftertreatment package comprising a first aftertreatment carrier assembly, a second aftertreatment carrier assembly downstream of the first aftertreatment carrier assembly, and downstream of the second aftertreatment carrier assembly a third post-treatment carrier assembly, the exhaust aftertreatment package further comprising an exhaust aftertreatment mixing device between the second aftertreatment carrier assembly and the third aftertreatment carrier assembly, the exhaust aftertreatment hybrid
  • the mixing device is post-treated for the aforementioned exhaust gas.
  • the present invention provides a fourth space between the first raised portion and the second raised portion by providing a second raised portion. This arrangement makes full use of the cross section, increases the distance and time of urea evaporation, and improves the uniformity of airflow mixing.
  • Figure 1 is a schematic perspective view of a tail gas aftertreatment mixing device of the present invention.
  • Figure 2 is a perspective view of another angle of Figure 1.
  • Figure 3 is a left side view of Figure 1.
  • Figure 4 is a right side view of Figure 1.
  • Figure 5 is a perspective view showing the housing of Figure 1 removed.
  • Fig. 6 is an exploded perspective view of Fig. 5;
  • Figure 7 is a front elevational view showing the first panel of Figure 3 removed.
  • Fig. 8 is an exploded perspective view of Fig. 1;
  • Figure 9 is a schematic cross-sectional view taken along line A-A of Figure 1.
  • the present invention discloses an exhaust aftertreatment mixing device 100 for use in an aftertreatment system such as an SCR to treat the exhaust of the engine.
  • the exhaust aftertreatment mixing device 100 includes a housing 1 and a mixing assembly 2 mounted within the housing 1.
  • the housing 1 has a cylindrical shape, and is provided with a mounting plate 11 recessed into the housing 1 and a mounting seat welded to the mounting plate 11 (not shown) Show).
  • the mount is for mounting a urea nozzle (not shown) to inject urea into the mixing assembly 2.
  • the mixing assembly 2 comprises a first plate 3, a second plate 4 and a mixer 5 between the first plate 3 and the second plate 4.
  • the first plate 3 is fixed in the housing 1.
  • the first plate 3 is provided with a first inlet 31 and a second inlet 32 respectively located on both sides.
  • the first plate 3 is further provided with a circular arc-shaped notch 33 at the middle portion and a notch 34 located below the notch 33.
  • the second plate 4 is provided with an outlet.
  • the outlet includes a first outlet 41 and a second outlet 42 that are respectively located on both sides.
  • the first outlet 41 and the second outlet 42 are both located at the edge of the second panel 4.
  • the mixer 5 includes a first space 51 communicating with the first inlet 31, a second space 52 communicating with the second inlet 32, and the first space 51 and the first A third space 53 between the two spaces 52, the top of the first space 51 is in communication with the third space 53, and the top of the second space 52 is also in communication with the third space 53.
  • the first space 51, the second space 52, and the third space 53 are blocked by the second plate 4 in the exhaust gas entering direction, so that most of the airflow must be from the first and second spaces.
  • 51, 52 enters the third space 53.
  • the urea nozzle is for injecting atomized urea droplets into the third space 53.
  • the mixer 5 includes a first curved wall 54, a first partition wall 55 that cooperates with the first curved wall 54, a second curved wall 56, and the second curved wall 56. a mating second partition wall 57, and a first ridge 58 projecting from the bottom into the third space 53, wherein the first space 51 is located at the first curved wall 54 and the first Between the partition walls 55, the second space 52 is located between the second curved wall 56 and the second partition wall 57.
  • the first partition wall 55 is provided with a first fixing portion 551 fixed to the bottom of the first curved wall 54 and a first extending arm 552 located inside the first curved wall 54.
  • a first swirl direction S1 is defined between the first curved wall 54 and the first partition wall 55.
  • the first extension arm 552 is curved and the first extension arm 552 is bent in the same direction as the first curved wall 54 such that the first swirl direction S1 More smooth.
  • the second partition wall 57 is provided with a second fixing portion 571 fixed to the bottom of the second curved wall 56 and a second extending arm 572 located inside the second curved wall 56.
  • a second swirling direction S2 is defined between the second curved wall 56 and the second dividing wall 57.
  • the second extension arm 572 is curved and the second extension arm 572 is bent in the same direction as the second curved wall 56 such that the second swirl direction S2 More smooth.
  • the first swirling direction S1 is one of clockwise or counterclockwise
  • the second swirling direction S2 is the other of clockwise or counterclockwise.
  • the first swirl direction S1 is a clockwise direction
  • the second swirl direction S2 is a counterclockwise direction.
  • the first extension arm 552 and the first curved wall 54 form a gradually contracting first opening 541 in a bottom-up direction.
  • the second extension arm 572 and the second curved wall 56 form a gradually expanding second opening 561 in a bottom-up direction.
  • the first raised portion 58, the first curved wall 54 and the second curved wall 56 are formed by bending a single piece, and are generally ⁇ -shaped. .
  • the mixer 5 is provided with a second ridge 59 located below the first ridge 58 to form a fourth space 50 between the first ridge 58 and the second ridge 59.
  • the fourth space 50 is blocked by the second plate 4 in the exhaust gas entering direction.
  • the mixer 5 further includes a cavity 35 below the second ridge 59 and corresponding to the recess 34.
  • the first ridge 58 is provided with a first side 581, a second side 582, and a first top edge 583 connecting the first side 581 and the second side 582 from the first side.
  • a first bottom edge 584 extending outwardly from the bottom of the side 581 and a second bottom edge 585 extending outwardly from the bottom of the second side edge 582.
  • the angle between the first side 581 and the second side 582 is an acute angle, and the first top edge 583, the first bottom edge 584, and the second bottom edge 585. They are all in the shape of an arc.
  • the first side 581 is provided with a plurality of first through holes 5811 communicating with the third space 53 and the fourth space 50
  • the second side 582 is provided to communicate with the third space 53 and the first side A plurality of second perforations 5821 of the four spaces 50.
  • the notch 33 of the first plate 3 and the first and second outlets 41, 42 of the second plate 4 are in communication with the fourth space 50.
  • the first perforation 5811 and the second perforation 5821 facilitate the breaking of the urea to make it into finer particles and enhance heat exchange, thereby facilitating better evaporation.
  • a "dead zone" having a relatively low flow velocity is formed on the leeward faces of the first side 581 and the second side 582.
  • the notch 33 enables the exhaust to directly purge the "dead zone", thereby effectively reducing the risk of crystallization herein.
  • the exhaust gas can also heat the area, further reducing the risk of crystallization.
  • the first raised portion 58 has the same shape as the second raised portion 59.
  • the second raised portion 59 includes a third side 591, a fourth side 592 opposite to the third side 591, and a second top connecting the third side 591 and the fourth side 592 A side 593, a third bottom edge 594 extending outwardly from a bottom of the third side edge 591, and a fourth bottom edge 595 extending outward from a bottom of the fourth side edge 592.
  • the angle between the third side 591 and the fourth side 592 is an acute angle, and the second top edge 593, the third bottom edge 594, and the fourth bottom edge 595 are all arcuate. Referring to FIG. 7, the third bottom edge 594 and the fourth bottom edge 595 are fixed to the inner side of the casing 1.
  • the first swirling direction S1 and the second swirling direction S2 are both in the cross section of the casing 1.
  • the fourth space 50 further defines a third swirl direction S3 and a fourth swirl direction S4 in the cross section, wherein the third swirl direction S3 is substantially the same as the first swirl direction S1
  • the fourth swirl direction S4 is substantially the same as the second swirl direction S2.
  • the present invention also relates to an exhaust aftertreatment package including a first post-process carrier assembly (not shown), a second post-process carrier assembly (not shown) downstream of the first post-process carrier assembly, and A third post-treatment carrier assembly (not shown) downstream of the second post-treatment carrier assembly.
  • the exhaust aftertreatment mixing device is located between the second aftertreatment carrier assembly and the third aftertreatment carrier assembly.
  • the first post-treatment carrier assembly is an oxidation catalyst (DOC)
  • the second post-treatment carrier assembly is a diesel particulate trap (DPF)
  • the third post-treatment carrier assembly is a selective catalytic reduction (SCR) .

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

Abstract

一种尾气后处理混合装置，其包括壳体（1）以及位于壳体（1）内的混合组件（2）。混合组件（2）包括第一板片（3）、第二板片（4）以及位于第一板片（3）与第二板片（4）之间的混合器（5），其中第一板片（3）设有分别位于两侧的第一进口（31）与第二进口（32）。混合器（5）包括与第一进口（31）连通的第一空间（51）、与第二进口（32）连通的第二空间（52）以及位于它们之间的第三空间（53）。混合器（5）设有从底部凸伸入第三空间（53）中的第一***部（58）以及位于第一***部（58）下方的第二***部（59），以在第一***部（58）与第二***部（59）之间形成第四空间（50）。第二板片（4）设有与第四空间（50）连通的出口。还公开一种尾气后处理混合装置的封装。如此设置，增加了尿素蒸发的距离和时间，提高了气流混合的均匀性。

Description

尾气后处理混合装置及其封装
本申请要求了申请日为2017年7月11日、申请号为201710561334.X、发明名称为“尾气后处理混合装置及其封装”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种尾气后处理混合装置及其封装，属于发动机尾气后处理技术领域。
背景技术
研究表明尾气后处理***(例如选择性催化还原***，SCR***)管路中氨分布的均匀程度对***的整体性能和耐久性能有重要的影响。如果氨分布不均匀会导致局部区域氨过多从而易造成氨泄漏，而在另一些氨稀薄区域造成氮氧化合物(NOx)转化效率过低。长时间氨的不均匀分布会导致催化剂老化不均匀，从而影响催化剂的整体性能。另外，尿素液滴的不均匀分布会造成局部管壁或混合结构温度过低，形成结晶，严重时会堵塞尾气管、导致发动机动力性能下降。
因此，有必要提供一种新型的尾气后处理混合装置及其封装，以解决上述技术问题。
发明内容
本发明的目的在于提供一种抗结晶能力较强的尾气后处理混合装置及具有该尾气后处理混合装置的尾气后处理封装。
为实现上述目的，本发明采用如下技术方案：一种尾气后处理混合装置，其包括壳体以及位于所述壳体内的混合组件，其中所述壳体设有用以安装尿素喷嘴以向所述混合组件中喷射尿素的安装座，所述混合组件包括第一板片、第二板片以及位于所述第一板片与所述第二板片之间的混合器，其中所述第一板片设有分别位于两侧的第一进口与第二进口，所述混合器包括与第一进口连通的第一空间、与所述第二进口连通的第二空间以及位于所述第一空间与所述第二空间之间的第三空间，所述第一空间的顶部与所述第三空间相连通，所述第二空间的顶部与所述第三空间也相连通；所述混合器设有从底部凸伸入所述第三空间中的第一***部，所述混合器还设有位于所述第一***部下方的第二***部，以在所述第一***部与所述第二***部之间形成第四空间；所述第一***部设有第一侧边以及第二侧边，所述第一侧边设有连通所述第三空间与所述第四空间的 若干第一穿孔，所述第二侧边设有连通所述第三空间与所述第四空间的若干第二穿孔，所述第二板片设有与所述第四空间连通的出口。
作为本发明进一步改进的技术方案，所述混合器设有第一弧形壁以及与所述第一弧形壁相配合的第一分隔壁，所述第一空间位于所述第一弧形壁与所述第一分隔壁之间。
作为本发明进一步改进的技术方案，所述第一分隔壁设有固定于所述第一弧形壁的底部的第一固定部以及位于所述第一弧形壁的内侧的第一延伸臂；所述第一弧形壁与所述第一分隔壁之间定义了第一旋流方向。
作为本发明进一步改进的技术方案，所述混合器设有第二弧形壁以及与所述第二弧形壁相配合的第二分隔壁，所述第二空间位于所述第二弧形壁与所述第二分隔壁之间。
作为本发明进一步改进的技术方案，所述第二分隔壁设有固定于所述第二弧形壁的底部的第二固定部以及位于所述第二弧形壁的内侧的第二延伸臂，所述第二弧形壁与所述第二分隔壁之间定义了第二旋流方向，其中所述第一旋流方向为顺时针或者逆时针中的一个，所述第二旋流方向为顺时针或者逆时针中的另一个。
作为本发明进一步改进的技术方案，所述第一旋流方向与所述第二旋流方向均在所述壳体的横截面内；所述第四空间还定义了位于所述横截面内的第三旋流方向与第四旋流方向，其中所述第三旋流方向与所述第一旋流方向大致相同，所述第四旋流方向与所述第二旋流方向大致相同。
作为本发明进一步改进的技术方案，所述第一***部包括连接所述第一侧边与所述第二侧边的第一顶边、自所述第一侧边的底部向外延伸的第一底边以及自所述第二侧边的底部向外延伸的第二底边；所述第二***部包括第三侧边、与所述第三侧边相对的第四侧边、连接所述第三侧边与所述第四侧边的第二顶边、自所述第三侧边的底部向外延伸的第三底边以及自所述第四侧边的底部向外延伸的第四底边。
作为本发明进一步改进的技术方案，所述第一侧边与所述第二侧边的夹角呈锐角，所述第一顶边、第一底边以及第二底边均呈圆弧状。
作为本发明进一步改进的技术方案，所述第一***部与所述第二***部的形状相同；所述第三侧边与所述第四侧边的夹角呈锐角，所述第二顶边、第三底边以及第四底边均呈圆弧状。
作为本发明进一步改进的技术方案，所述第三底边以及所述第四底边固定在所述壳体的内侧。
作为本发明进一步改进的技术方案，所述第一空间、所述第二空间、所述第三空间以及所述第 四空间在排气进入方向上被所述第二板片堵住，使得绝大部分气流必须从第一、第二空间旋转进入到第三空间中，并在第四空间中呈双旋流流向所述出口。
作为本发明进一步改进的技术方案，所述第一***部、所述第一弧形壁以及所述第二弧形壁是由一块板片弯折形成，整体上大致呈ω形。
作为本发明进一步改进的技术方案，所述出口包括分别位于两侧的第一出口以及第二出口。
作为本发明进一步改进的技术方案，所述第一出口以及所述第二出口均位于所述第二板片的边缘处。
作为本发明进一步改进的技术方案，所述第一板片设有连通所述第四空间的缺口。
作为本发明进一步改进的技术方案，所述尿素喷嘴用以向所述第三空间中喷射雾化的尿素液滴。
本发明还涉及一种尾气后处理封装，其包括第一后处理载体组件、位于所述第一后处理载体组件的下游的第二后处理载体组件以及位于所述第二后处理载体组件的下游的第三后处理载体组件，所述尾气后处理封装还包括位于所述第二后处理载体组件与所述第三后处理载体组件之间的尾气后处理混合装置，所述尾气后处理混合装置为前述的尾气后处理混合装置。
相较于现有技术，本发明通过设置第二***部以在所述第一***部与所述第二***部之间形成第四空间。如此设置，充分利用了横截面，增加了尿素蒸发的距离和时间，提高了气流混合的均匀性。
附图说明
图1是本发明尾气后处理混合装置的立体示意图。
图2是图1另一角度的立体示意图。
图3是图1的左视图。
图4是图1的右视图。
图5是去除图1中壳体后的立体示意图。
图6是图5的立体分解图。
图7是去除图3中第一板片后的主视图。
图8是图1的立体分解图。
图9是图1中A-A线的剖面示意图。
具体实施方式
请参图1至图9所示，本发明揭示了一种尾气后处理混合装置100，用于例如SCR等后处理***中以处理发动机的尾气。所述尾气后处理混合装置100包括壳体1以及安装于所述壳体1内的混合组件2。
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以及焊接在所述安装板11上的安装座(未图示)。所述安装座用以安装尿素喷嘴(未图示)以向所述混合组件2中喷射尿素。
所述混合组件2包括第一板片3、第二板片4以及位于所述第一板片3与所述第二板片4之间的混合器5。所述第一板片3固定在所述壳体1中。所述第一板片3设有分别位于两侧的第一进口31与第二进口32。另外，所述第一板片3还设有位于其中部的圆弧形的缺口33以及位于所述缺口33下方的凹口34。
请参图4及图6所示，所述第二板片4设有出口。在本发明图示的实施方式中，所述出口包括分别位于两侧的第一出口41以及第二出口42。所述第一出口41以及所述第二出口42均位于所述第二板片4的边缘处。
请参图6所示，所述混合器5包括与第一进口31连通的第一空间51、与所述第二进口32连通的第二空间52以及位于所述第一空间51与所述第二空间52之间的第三空间53，所述第一空间51的顶部与所述第三空间53相连通，所述第二空间52的顶部与所述第三空间53也相连通。所述第一空间51、所述第二空间52以及所述第三空间53在排气进入方向上被所述第二板片4堵住，使得绝大部分气流必须从第一、第二空间51、52进入到第三空间53中。所述尿素喷嘴用以向所述第三空间53中喷射雾化的尿素液滴。
具体地，所述混合器5包括第一弧形壁54、与所述第一弧形壁54相配合的第一分隔壁55、第二弧形壁56、与所述第二弧形壁56相配合的第二分隔壁57、以及从底部凸伸入所述第三空间53中的第一***部58，其中所述第一空间51位于所述第一弧形壁54与所述第一分隔壁55之间，所述第二空间52位于所述第二弧形壁56与所述第二分隔壁57之间。所述第一分隔壁55设有固定于所述第一弧形壁54的底部的第一固定部551以及位于所述第一弧形壁54的内侧的第一延伸臂552。所述第一弧形壁54与所述第一分隔壁55之间定义了第一旋流方向S1。在本发明图示的 实施方式中，第一延伸臂552呈弧形且所述第一延伸臂552与所述第一弧形壁54向同一方向折弯，使得所述第一旋流方向S1比较顺滑。所述第二分隔壁57设有固定于所述第二弧形壁56的底部的第二固定部571以及位于所述第二弧形壁56的内侧的第二延伸臂572。所述第二弧形壁56与所述第二分隔壁57之间定义了第二旋流方向S2。在本发明图示的实施方式中，第二延伸臂572呈弧形且所述第二延伸臂572与所述第二弧形壁56向同一方向折弯，使得所述第二旋流方向S2比较顺滑。其中，所述第一旋流方向S1为顺时针或者逆时针中的一个，所述第二旋流方向S2为顺时针或者逆时针中的另一个。请参图7中的空心箭头所示，在本发明图示的实施方式中，所述第一旋流方向S1为顺时针方向，所述第二旋流方向S2为逆时针方向。如此设置，可以充分利用尾气后处理混合装置100的横截面，以形成双旋流的方式提高尿素与排气的混合距离，提高尿素蒸发与混合的均匀性，抗结晶能力较强。在本发明图示的实施方式中，所述第一延伸臂552与所述第一弧形壁54在自下而上的方向上形成逐渐收缩式的第一开口541。所述第二延伸臂572与所述第二弧形壁56在自下而上的方向上形成逐渐收缩式的第二开口561。在本发明图示的实施方式中，所述第一***部58、所述第一弧形壁54以及所述第二弧形壁56是由一块板片弯折形成，整体上大致呈ω形。
所述混合器5设有位于所述第一***部58下方的第二***部59，以在所述第一***部58与所述第二***部59之间形成第四空间50。所述第四空间50在排气进入方向上被所述第二板片4堵住。所述混合器5还包括位于所述第二***部59下方且对应于所述凹口34的凹腔35。所述第一***部58设有第一侧边581、第二侧边582、连接所述第一侧边581与所述第二侧边582的第一顶边583、自所述第一侧边581的底部向外延伸的第一底边584以及自所述第二侧边582的底部向外延伸的第二底边585。在本发明图示的实施方式中，所述第一侧边581与所述第二侧边582的夹角呈锐角，所述第一顶边583、第一底边584以及第二底边585均呈圆弧状。所述第一侧边581设有连通所述第三空间53与所述第四空间50的若干第一穿孔5811，所述第二侧边582设有连通所述第三空间53与所述第四空间50的若干第二穿孔5821。所述第一板片3的缺口33以及所述第二板片4的第一、第二出口41、42均与所述第四空间50相连通。所述第一穿孔5811与所述第二穿孔5821有利于实现尿素破碎使之成为更细的颗粒，并增强换热，从而利于更好的蒸发。排气混合物在穿过所述第一穿孔5811与第二穿孔5821时，容易在所述第一侧边581与第二侧边582的背风面形成流速较低的“死区”。然而，在本发明图示的实施方式中，所述缺口33 能够让排气直接对该“死区”进行吹扫，从而有效降低了此处的结晶风险。同时，排气还能够对该区域进行加热，进一步降低结晶风险。
所述第一***部58与所述第二***部59的形状相同。所述第二***部59包括第三侧边591、与所述第三侧边591相对的第四侧边592、连接所述第三侧边591与所述第四侧边592的第二顶边593、自所述第三侧边591的底部向外延伸的第三底边594以及自所述第四侧边592的底部向外延伸的第四底边595。所述第三侧边591与所述第四侧边592的夹角呈锐角，所述第二顶边593、第三底边594以及第四底边595均呈圆弧状。请参图7所示，所述第三底边594以及所述第四底边595固定在所述壳体1的内侧。
请参图7所示，所述第一旋流方向S1与所述第二旋流方向S2均在所述壳体1的横截面内。所述第四空间50还定义了位于所述横截面内的第三旋流方向S3与第四旋流方向S4，其中所述第三旋流方向S3与所述第一旋流方向S1大致相同，所述第四旋流方向S4与所述第二旋流方向S2大致相同。如此设置，可以充分利用尾气后处理混合装置100的横截面，以形成双旋流的方式提高尿素与排气的混合距离，提高尿素蒸发与混合的均匀性，抗结晶能力较强。
当发动机的排气进入到所述尾气后处理混合装置100中时，绝大部分排气自第一、第二进口31、32进入到混合器5中，一小部分排气直接穿过缺口33进入到第四空间50中，进入到凹腔35中的排气受到第二板片4的阻挡无法直接通过，可以给混合器5提供一定程度的加热；进入到第一、第二空间51、52中的排气在弧形结构的导引下分别从两侧旋转进入到第三空间53中；当满足喷射条件时，尿素喷嘴向第三空间53中喷射尿素，雾化的尿素液滴与发动机的排气一起旋转混合，并穿过第一、第二穿孔5811、5821进入到第四空间50中。请参图7所示，尿素液滴与发动机的排气的混合物在沿着第三旋流方向S3与第四旋流方向S4呈双旋流流向所述出口，最后自第一、第二出口41、42离开。
本发明还涉及一种尾气后处理封装，其包括第一后处理载体组件(未图示)、位于所述第一后处理载体组件的下游的第二后处理载体组件(未图示)以及位于所述第二后处理载体组件的下游的第三后处理载体组件(未图示)。所述尾气后处理混合装置位于所述第二后处理载体组件与所述第三后处理载体组件之间。优选地，所述第一后处理载体组件为氧化催化器(DOC)，第二后处理载体组件为柴油颗粒捕集器(DPF)，第三后处理载体组件为选择性催化还原器(SCR)。
需要说明的是，本发明中所描述的“上”、“下”、“顶部”、“底部”等方位不应当做局限的 理解，因为根据元件摆放位置的不同，这些位置关系也应当进行适应性理解。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 (17)

  1. 一种尾气后处理混合装置，其包括壳体以及位于所述壳体内的混合组件，其中所述壳体设有用以安装尿素喷嘴以向所述混合组件中喷射尿素的安装座，其特征在于：所述混合组件包括第一板片、第二板片以及位于所述第一板片与所述第二板片之间的混合器，其中所述第一板片设有分别位于两侧的第一进口与第二进口，所述混合器包括与第一进口连通的第一空间、与所述第二进口连通的第二空间以及位于所述第一空间与所述第二空间之间的第三空间，所述第一空间的顶部与所述第三空间相连通，所述第二空间的顶部与所述第三空间也相连通；所述混合器设有从底部凸伸入所述第三空间中的第一***部，所述混合器还设有位于所述第一***部下方的第二***部，以在所述第一***部与所述第二***部之间形成第四空间；所述第一***部设有第一侧边以及第二侧边，所述第一侧边设有连通所述第三空间与所述第四空间的若干第一穿孔，所述第二侧边设有连通所述第三空间与所述第四空间的若干第二穿孔，所述第二板片设有与所述第四空间连通的出口。
  2. 如权利要求1所述的尾气后处理混合装置，其特征在于：所述混合器设有第一弧形壁以及与所述第一弧形壁相配合的第一分隔壁，所述第一空间位于所述第一弧形壁与所述第一分隔壁之间。
  3. 如权利要求2所述的尾气后处理混合装置，其特征在于：所述第一分隔壁设有固定于所述第一弧形壁的底部的第一固定部以及位于所述第一弧形壁的内侧的第一延伸臂；所述第一弧形壁与所述第一分隔壁之间定义了第一旋流方向。
  4. 如权利要求3所述的尾气后处理混合装置，其特征在于：所述混合器设有第二弧形壁以及与所述第二弧形壁相配合的第二分隔壁，所述第二空间位于所述第二弧形壁与所述第二分隔壁之间。
  5. 如权利要求4所述的尾气后处理混合装置，其特征在于：所述第二分隔壁设有固定于所述第二弧形壁的底部的第二固定部以及位于所述第二弧形壁的内侧的第二延伸臂，所述第二弧形壁与所述第二分隔壁之间定义了第二旋流方向，其中所述第一旋流方向为顺时针或者逆时针中的一个，所述第二旋流方向为顺时针或者逆时针中的另一个。
  6. 如权利要求5所述的尾气后处理混合装置，其特征在于：所述第一旋流方向与所述第二旋流方向均在所述壳体的横截面内；所述第四空间还定义了位于所述横截面内的第三旋流方向与第四旋流方向，其中所述第三旋流方向与所述第一旋流方向大致相同，所述第四旋流方向与所述第二旋流方向大致相同。
  7. 如权利要求1所述的尾气后处理混合装置，其特征在于：所述第一***部包括连接所述第一侧边与所述第二侧边的第一顶边、自所述第一侧边的底部向外延伸的第一底边以及自所述第二侧边的底部向外延伸的第二底边；所述第二***部包括第三侧边、与所述第三侧边相对的第四侧边、连接所述第三侧边与所述第四侧边的第二顶边、自所述第三侧边的底部向外延伸的第三底边以及自所述第四侧边的底部向外延伸的第四底边。
  8. 如权利要求7所述的尾气后处理混合装置，其特征在于：所述第一侧边与所述第二侧边的夹角呈锐角，所述第一顶边、第一底边以及第二底边均呈圆弧状。
  9. 如权利要求7所述的尾气后处理混合装置，其特征在于：所述第一***部与所述第二***部的形状相同；所述第三侧边与所述第四侧边的夹角呈锐角，所述第二顶边、第三底边以及第四底边均呈圆弧状。
  10. 如权利要求9所述的尾气后处理混合装置，其特征在于：所述第三底边以及所述第四底边固定在所述壳体的内侧。
  11. 如权利要求1所述的尾气后处理混合装置，其特征在于：所述第一空间、所述第二空间、所述第三空间以及所述第四空间在排气进入方向上被所述第二板片堵住，使得绝大部分气流必须从第一、第二空间旋转进入到第三空间中，并在第四空间中呈双旋流流向所述出口。
  12. 如权利要求4所述的尾气后处理混合装置，其特征在于：所述第一***部、所述第一弧形壁以及所述第二弧形壁是由一块板片弯折形成，整体上大致呈ω形。
  13. 如权利要求1所述的尾气后处理混合装置，其特征在于：所述出口包括分别位于两侧的第一出口以及第二出口。
  14. 如权利要求13所述的尾气后处理混合装置，其特征在于：所述第一出口以及所述第二出口均位于所述第二板片的边缘处。
  15. 如权利要求1所述的尾气后处理混合装置，其特征在于：所述第一板片设有连通所述第四空间的缺口。
  16. 如权利要求1所述的尾气后处理混合装置，其特征在于：所述尿素喷嘴用以向所述第三空间中喷射雾化的尿素液滴。
  17. 一种尾气后处理封装，其包括第一后处理载体组件、位于所述第一后处理载体组件的下游的第二后处理载体组件以及位于所述第二后处理载体组件的下游的第三后处理载体组件，其特征在于，所述尾气后处理封装还包括位于所述第二后处理载体组件与所述第三后处理载体组件之间的尾气后处理混合装置，所述尾气后处理混合装置为权利要求1至16项中任意一项所述的尾气后处理混合装置。
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