WO2019128163A1 - Dispositif de mélange de post-traitement de gaz résiduaire, et son emballage - Google Patents

Dispositif de mélange de post-traitement de gaz résiduaire, et son emballage Download PDF

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Publication number
WO2019128163A1
WO2019128163A1 PCT/CN2018/093001 CN2018093001W WO2019128163A1 WO 2019128163 A1 WO2019128163 A1 WO 2019128163A1 CN 2018093001 W CN2018093001 W CN 2018093001W WO 2019128163 A1 WO2019128163 A1 WO 2019128163A1
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WO
WIPO (PCT)
Prior art keywords
space
curved wall
mixing device
plate
exhaust gas
Prior art date
Application number
PCT/CN2018/093001
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English (en)
Chinese (zh)
Inventor
王聪
吴�琳
王平
Original Assignee
天纳克（苏州）排放系统有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201810055394.9A external-priority patent/CN109989809A/zh
Application filed by 天纳克（苏州）排放系统有限公司 filed Critical 天纳克（苏州）排放系统有限公司
Publication of WO2019128163A1 publication Critical patent/WO2019128163A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors

Definitions

  • the invention relates to an exhaust gas 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 post-treatment mixing device comprising a casing and a mixing assembly located in the casing, the mixing assembly comprising a first plate, a second plate, and a a third plate between the first plate and the second plate and a mixer between the first plate and the third plate, wherein the first plate is provided a first inlet and a second inlet respectively located at two sides, the mixer comprising a first space in communication with the first inlet, a second space in communication with the second inlet, and a first space and a space 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 a ridge protruding from the bottom into the third space, a fourth space and a fifth space located below the ridge, and a sixth space between the fourth space and the fifth space;
  • the ridge portion is provided with a first side and a second side.
  • the first side edge is provided with a plurality of first perforations connecting the third space and the fourth space
  • the second side edge is provided with a plurality of second holes connecting the third space and the fifth space
  • a second plate is provided with a first outlet communicating with the fourth space and a second outlet communicating with the fifth space
  • the third plate is provided in communication with the sixth space a first through hole and a second through hole for respectively connecting the airflow from the first through hole to the first space and the second space
  • the housing and the mixing component are provided to cooperate to prevent A relative rotational positioning configuration is created with the housing when the mixer is installed.
  • the first inlet is in axial communication with the first space
  • the second inlet is axially connected to the second space
  • the first space and the The second space is substantially in radial communication with the third space
  • the first outlet is in axial communication with the fourth space
  • the second outlet is axially connected to the fifth space
  • the sixth space is in axial communication with the first through hole.
  • the third plate is provided with a first baffle portion for axially located in the fourth space and for axially located in the fifth space. a second baffle portion.
  • the second through holes are respectively located outside the first baffle portion and the second baffle portion; between the second plate and the third plate A seventh space is provided, and the second through holes respectively communicate the seventh space and the first space and the seventh space and the second space.
  • 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 a clockwise and a counterclockwise direction, and the second swirling direction is Clockwise and counterclockwise.
  • the ridge is connected between the first curved wall and the second curved wall; the mixer further includes a first bend fixed under the ridge a rotating portion and a second turning portion, wherein the fourth space is located at least between the first bending portion and the first side, and the fifth space is located at least at the second bending portion Between the second side.
  • the first swirling direction and the second swirling direction are both in a cross section of the casing; the fourth space and the fifth space are also respectively defined a third swirling direction and a fourth swirling direction in the cross section, wherein the third swirling direction is substantially the same as the first swirling direction, the fourth swirling direction and the second The direction of the swirl is approximately the same.
  • the ridge, the first curved wall and the second curved wall are formed by bending a single piece, and are substantially ⁇ -shaped as a whole.
  • the housing is provided with a positioning groove on a circumference thereof; the first bending portion and the second bending portion are provided with a tab inserted in the positioning groove.
  • the housing is further provided with a slot corresponding to the first and second bending portions on a circumference thereof; after the tab is inserted into the positioning slot The first and second bent portions exposed in the slots are connected to the housing by externally filling the slots.
  • first curved wall, the second curved wall, the ridge, the first partition wall and the second partition wall are provided with each other between the corresponding first and third plates. Positioning structure for positioning.
  • the positioning structure is a slot and a flange.
  • the first plate is provided with a plurality of first slots and a plurality of second slots;
  • the third plate is provided with a plurality of third slots and a plurality of fourth slots;
  • the first curved wall, the second curved wall, the ridge, the first partition, and the second partition are respectively provided with first protrusions positioned in the corresponding first, second, third, and fourth slots edge.
  • the first plate is provided with a recess between the first inlet and the second inlet, the first curved wall, the second curved wall and the ridge Portions are also provided with second flanges positioned at the edges of the corresponding first inlet, second inlet, and recess, respectively.
  • 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 And a third aftertreatment carrier assembly, the exhaust aftertreatment package further comprising the foregoing exhaust aftertreatment mixing device between the second aftertreatment carrier assembly and the third aftertreatment carrier assembly.
  • the mixer of the present invention makes full use of the cross section of the casing, increases the distance and time of urea evaporation in a limited space, and improves the uniformity of airflow mixing;
  • Providing thereon a second through hole for respectively connecting the airflow from the first through hole to the first space and the second space, so as to be arranged, the airflow with a higher temperature can be directed to the front and back sides of the ridge Increases heat transfer and improves the efficiency of urea evaporation.
  • the positioning is facilitated by providing a positioning configuration that cooperates with each other to prevent relative rotation with the housing when the mixer is installed.
  • 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.
  • Figure 6 is a perspective view of another angle of Figure 5.
  • Fig. 7 is a partially exploded perspective view of Fig. 5;
  • Figure 8 is a front elevational view showing the first sheet of Figure 3 removed.
  • Figure 9 is a schematic cross-sectional view taken along line A-A of Figure 8.
  • Fig. 10 is an exploded perspective view of Fig. 7;
  • the present invention discloses an exhaust aftertreatment mixing device 100 for use in an aftertreatment system such as an SCR to treat engine exhaust.
  • the exhaust aftertreatment mixing device 100 includes a housing 1 and a mixing assembly 2 mounted within the housing 1.
  • the casing 1 has a cylindrical shape, and is provided with a mounting plate 11 recessed into the casing 1 and a mounting seat 12 welded to the mounting plate 11.
  • the mount 12 is used to mount a urea nozzle (not shown) to inject urea droplets into the mixing assembly 2.
  • the mixing assembly 2 includes a first plate 3, a second plate 4, a third plate 5 between the first plate 3 and the second plate 4, and the first plate 3 and a mixer 6 between the third plate 5.
  • the first plate 3, the second plate 4, and the third plate 5 are each fixed in the casing 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 recess 33 located below it and located between the first inlet 31 and the second inlet 32.
  • the first plate 3 is provided with a plurality of first slots 34 and a plurality of second slots 35.
  • the second plate 4 is provided with a first outlet 41 and a second outlet 42 on both sides thereof.
  • the first outlet 41 and the second outlet 42 are both located at the edge of the second panel 4.
  • the third plate 5 is provided with a first baffle portion 51, a second baffle portion 52, a first through hole 53 between the first baffle portion 51 and the second baffle portion 52, and a location The first baffle portion 51 and the two second through holes 54 outside the second baffle portion 52 are described.
  • the third plate 5 is provided with a plurality of third slots 55 and a plurality of fourth slots 56.
  • the mixer 6 includes a first space 61 communicating with the first inlet 31, a second space 62 communicating with the second inlet 32, and the first space 61 and a third space 63 between the second spaces 62, a top of the first space 61 is in communication with the third space 63, and a top of the second space 62 is also connected to the third space 63. .
  • the first space 61, the second space 62, and the third space 63 are blocked by the second plate 4 and the third plate 5 in the axial direction (the exhaust gas entering direction), so that a part of the airflow It is necessary to enter the third space 63 from the first and second spaces 61, 62.
  • the urea nozzle is for injecting atomized urea droplets into the third space 63.
  • the mixer 6 includes a first curved wall 64, a first dividing wall 65 that cooperates with the first curved wall 64, a second curved wall 66, and the second curved wall 66. a mating second partition wall 67 and a ridge 68 projecting from the bottom into the third space 63, wherein the first space 61 is located at the first curved wall 64 and the first partition wall Between the 65, the second space 62 is located between the second curved wall 66 and the second partition wall 67, and the third space 63 is located at the first partition wall 65 and the second partition wall 67. between.
  • the first partition wall 65 is provided with a first fixing portion 651 fixed to the bottom of the first curved wall 64 and a first extending arm 652 located inside the first curved wall 64.
  • the bottom of the first curved wall 64 is provided with a first positioning groove 641, and the first fixing portion 651 is inserted in the first positioning groove 641 for actual positioning.
  • This arrangement facilitates accurate assembly of the first partition wall 65.
  • a first swirl direction S1 is defined between the first curved wall 64 and the first partition wall 65 .
  • the second partition wall 67 is provided with a second fixing portion 671 fixed to the bottom of the second curved wall 66 and a second extending arm 672 located inside the second curved wall 66.
  • the bottom of the second curved wall 66 is provided with a second positioning groove 661, and the second fixing portion 671 is inserted in the second positioning groove 661 for practical positioning.
  • This arrangement facilitates accurate assembly of the second partition wall 67.
  • a second swirl direction S2 is defined between the second curved wall 66 and the second dividing wall 67.
  • the first swirl direction S1 is one of clockwise and counterclockwise
  • the second swirl direction S2 is the other of clockwise and counterclockwise.
  • the first swirl direction S1 is a clockwise direction
  • the second swirl direction S2 is a counterclockwise direction.
  • the cross section of the exhaust gas post-treatment mixing device 100 can be fully utilized to form a double swirling manner to increase the mixing distance between the urea and the exhaust gas, improve the uniformity of evaporation and mixing of the urea, and have strong anti-crystallization ability.
  • the ridge 68 is coupled between the first curved wall 64 and the second curved wall 66.
  • the raised portion 68, the first curved wall 64, and the second curved wall 66 are formed by bending a single sheet and are generally ⁇ -shaped as a whole.
  • the positioning structure is a slot and a flange.
  • the first curved wall 64 , the second curved wall 66 , the raised portion 68 , the first dividing wall 65 and the second dividing wall 67 are respectively provided.
  • the first flanges 691, 693 are positioned in the corresponding first, second, third, and fourth slots 34, 35, 55, 56.
  • the first curved wall 64, the second curved wall 66, and the raised portion 68 are also provided with second flanges 692 positioned at the edges of the corresponding first inlet 31, second inlet 32, and recess 33, respectively. .
  • the ridge portion 68 is provided with a first side 681 , a second side 682 , and a first top edge connecting the first side 681 and the second side 682 . 683.
  • a first bottom edge 684 extending outward from a bottom of the first side edge 681 and a second bottom edge 685 extending outward from a bottom of the second side edge 682.
  • the angle between the first side 681 and the second side 682 is an acute angle
  • the first top edge 683, the first bottom edge 684, and the second bottom edge 685 are all in the shape of an arc.
  • the mixer 5 is provided with a first turning portion 71 and a second turning portion 72 located below the ridges 68, wherein the mixer 5 further includes a fourth space 74 located below the ridges 68. And a fifth space 75 and a sixth space 76 between the fourth space 74 and the fifth space 75; the fourth space 74 is located at least at the first bending portion 71 and the first side The fifth space 75 is located between the sides 681 at least between the second curved portion 72 and the second side 682. As shown in FIG.
  • the first side 681 is provided with a plurality of first through holes 6811 communicating with the third space 63 and the fourth space 74
  • the second side 682 is provided with the first side Three spaces 63 and a plurality of second perforations 6821 of the fifth space 75.
  • the housing 1 and the mixing assembly 2 are provided with a cooperating positioning configuration.
  • the positioning configuration is a positioning groove and a tab.
  • the housing 1 is provided with a positioning groove 13 on its circumference; the first bending portion 71 and the second bending portion 72 are provided with a tab 79 inserted in the positioning groove 13.
  • the housing 1 is further provided on its circumference with a slot 14 corresponding to the first and second bending portions 71, 72; the tab 79 is inserted into the housing After positioning in the groove 13, the groove 14 is filled and welded externally to connect the first and second bending portions 71, 72 exposed in the groove 14 with the casing 1.
  • the first perforation 6811 and the second perforation 6821 are advantageous for achieving urea crushing to become finer particles and enhancing heat exchange, thereby facilitating better evaporation.
  • the sixth space 76 allows the exhaust to heat the ridges 68, further reducing the risk of crystallization.
  • the fourth space 74 and the fifth space 75 respectively define a third swirling direction S3 and a fourth swirling direction S4 in the cross section, wherein the third space
  • the 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 first baffle portion 51 of the third plate 5 is located in the fourth space 74 in the axial direction, and the second baffle portion 52 of the third plate 5 is located in the fifth direction in the axial direction.
  • the space 75 acts to block the air flow.
  • a seventh space 77 is disposed between the second plate 4 and the third plate 5, and the second through hole 54 communicates with the seventh space 77 and the first space 61 and communicates with the second space The seventh space 77 and the second space 62.
  • the airflow having a higher exhaust temperature can be directed to the front and back sides of the ridge portion 68 to enhance heat exchange, thereby improving the efficiency of urea evaporation.
  • the first inlet 31 communicates with the first space 61 in the axial direction
  • the second inlet 32 communicates with the second space 62 in the axial direction
  • the first space 61 and the second space 62 communicate with the third space 63 substantially in the radial direction
  • the first outlet 41 communicates with the fourth space 74 in the axial direction
  • the second outlet 42 The fifth space 75 is communicated in the axial direction
  • the sixth space 76 communicates with the first through hole 53 in the axial direction.
  • the mixture of the urea droplets and the exhaust gas of the engine flows in a double swirl flow along the third swirl direction S3 and the fourth swirl direction S4 to the fourth and fifth spaces 74, 75, and finally
  • the first and second outlets 41, 42 are separated.
  • the exhaust gas entering the sixth space 76 is blocked to a certain extent by the second plate 4, and the mixer 5 can be supplied with a certain degree of heating; in addition, as shown by the dotted arrow below in FIG.
  • the first space and the second space 61, 62 can be swung through the seventh space 77 and the second through hole 54, thereby heating both the front and back sides of the ridge portion 68, thereby improving the efficiency of urea evaporation.
  • 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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  • 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

L'invention concerne un dispositif de mélange de post-traitement de gaz résiduaire, comprenant un carter (1), un ensemble de mélange (2) disposé à l'intérieur du carter (1). L'ensemble de mélange (2) comprend une première plaque (3), une seconde plaque (4), une troisième plaque (5), et un mélangeur (6). La première plaque (3) est pourvue d'une première entrée (31) et d'une seconde entrée (32) situées respectivement de chaque côté. Le mélangeur (6) comprend une saillie (68) ainsi qu'un quatrième espace (74) et un cinquième espace (75) situés au-dessous de la saillie (68). La saillie (68) est pourvue d'un premier bord latéral (681) et d'un second bord latéral (682), le premier bord latéral (681) étant pourvu d'une pluralité de premiers trous traversants (6811) pour permettre à un troisième espace (63) d'être en communication avec le quatrième espace (74), et le second bord latéral (682) est pourvu d'une pluralité de seconds trous traversants (6821) pour permettre au troisième espace (63) d'être en communication avec le cinquième espace (75). Le carter (1) et l'ensemble de mélange (2) sont pourvus de structures de positionnement qui coopèrent pour empêcher le mélangeur (6) de tourner par rapport au carter pendant l'installation. L'agencement facilite l'assemblage et le positionnement. L'invention concerne également un emballage de post-traitement de gaz résiduaire.
PCT/CN2018/093001 2017-12-29 2018-06-27 Dispositif de mélange de post-traitement de gaz résiduaire, et son emballage WO2019128163A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201711489594.7 2017-12-29
CN201711489594 2017-12-29
CN201810055394.9A CN109989809A (zh) 2017-12-29 2018-01-19 尾气后处理混合装置及其封装
CN201810055394.9 2018-01-19

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Publication Number Publication Date
WO2019128163A1 true WO2019128163A1 (fr) 2019-07-04

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006009608A (ja) * 2004-06-23 2006-01-12 Hino Motors Ltd 排気浄化装置
JP2006077576A (ja) * 2004-09-07 2006-03-23 Meidensha Corp 脱硝反応器
CN1985080A (zh) * 2004-07-16 2007-06-20 日产柴油机车工业株式会社 发动机的排气净化装置
CN204511599U (zh) * 2015-03-17 2015-07-29 天纳克（苏州）排放系统有限公司 混合管及其排气处理装置
CN104832255A (zh) * 2015-05-13 2015-08-12 天纳克（苏州）排放系统有限公司 双层混合管及其排气处理装置
CN206111296U (zh) * 2016-09-26 2017-04-19 天纳克（苏州）排放系统有限公司 混合组件

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006009608A (ja) * 2004-06-23 2006-01-12 Hino Motors Ltd 排気浄化装置
CN1985080A (zh) * 2004-07-16 2007-06-20 日产柴油机车工业株式会社 发动机的排气净化装置
JP2006077576A (ja) * 2004-09-07 2006-03-23 Meidensha Corp 脱硝反応器
CN204511599U (zh) * 2015-03-17 2015-07-29 天纳克（苏州）排放系统有限公司 混合管及其排气处理装置
CN104832255A (zh) * 2015-05-13 2015-08-12 天纳克（苏州）排放系统有限公司 双层混合管及其排气处理装置
CN206111296U (zh) * 2016-09-26 2017-04-19 天纳克（苏州）排放系统有限公司 混合组件

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