WO2019140865A1 - Dispositif de post-traitement de gaz d'échappement - Google Patents

Dispositif de post-traitement de gaz d'échappement Download PDF

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Publication number
WO2019140865A1
WO2019140865A1 PCT/CN2018/093011 CN2018093011W WO2019140865A1 WO 2019140865 A1 WO2019140865 A1 WO 2019140865A1 CN 2018093011 W CN2018093011 W CN 2018093011W WO 2019140865 A1 WO2019140865 A1 WO 2019140865A1
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WO
WIPO (PCT)
Prior art keywords
aftertreatment
carrier assembly
exhaust gas
exhaust
aftertreatment device
Prior art date
Application number
PCT/CN2018/093011
Other languages
English (en)
Chinese (zh)
Inventor
李军良
王聪
毛伟
王伟
Original Assignee
天纳克（苏州）排放***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
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
Publication of WO2019140865A1 publication Critical patent/WO2019140865A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • 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
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • 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
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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 exhaust gas aftertreatment device, and belongs to the technical field of engine exhaust aftertreatment.
  • the uniformity of ammonia distribution in the exhaust gas aftertreatment system (eg, selective catalytic reduction system, SCR system) has an important impact on the overall performance and durability of the system. If the ammonia distribution is uneven, it will lead to excessive ammonia in the local area and easy to cause ammonia leakage, while in other thin ammonia regions, the nitrogen oxide (NOx) conversion efficiency is too low. Uneven distribution of ammonia over a long period of time can result in uneven aging of the catalyst, thereby affecting the overall performance of the catalyst. The uneven distribution of urea droplets will cause the local tube wall or mixed structure temperature to be too low to form crystallization. In severe cases, the tail gas pipe will be blocked, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • an exhaust aftertreatment device including a first post-processing carrier assembly, a second post-processing carrier assembly, and the first post-processing carrier assembly and the second rear Processing a mixer assembly between the carrier assemblies, wherein the mixer assembly includes a housing, a mixing tube positioned within the housing, and a baffle secured to a periphery of the mixing tube, the baffle placing the housing Dividing into a first space in communication with the first post-processing carrier assembly and a second space in communication with the second post-processing carrier assembly, the mixing tube including a first tube portion located within the first space And a second tube portion located in the second space, wherein the first tube portion is provided with at least two first openings respectively located at two sides thereof, and the exhaust gas after-treatment device further comprises an occlusion in the first The first shutter portion of the front end of the opening and the second shutter portion are such that a majority of the exhaust flow needs to bypass the first and second shutter portions to enter the first opening.
  • the first post-treatment carrier assembly, the second post-treatment carrier assembly, and the mixer assembly are arranged in a straight line.
  • the housing is provided with a first axis
  • the mixing tube is provided with a second axis, the first axis intersecting the second axis.
  • the first axis is perpendicular to the second axis.
  • the first pipe portion includes a connecting portion between the first openings
  • the exhaust gas after-treatment device includes a shutter welded on the connecting portion, the first The shutter portion and the second shutter portion are located on both sides of the shutter.
  • the exhaust gas aftertreatment device is provided with a nozzle mounting seat on the casing and used to install a urea nozzle to spray the atomized urea solution into the mixing tube.
  • the exhaust gas after-treatment device further includes steel wool located in the mixing tube, wherein the steel wool is used for the exhaust gas and the urea liquid droplet to pass through to further increase The urea droplets are broken and evaporated.
  • the first post-treatment carrier assembly includes a diesel particulate filter
  • the second post-treatment carrier assembly includes a selective catalytic reducing agent
  • the exhaust aftertreatment device further includes an oxidation catalyst upstream of the first aftertreatment carrier assembly.
  • the first shutter portion is provided with a first circular arc edge that abuts against the inner side of the housing, and the second shutter portion is disposed to abut the inner side of the housing.
  • the second arc edge is provided.
  • the present invention rectifies by providing the first and second shielding portions, thereby improving the uniformity of the airflow distribution and improving the mixing effect.
  • Figure 1 is a perspective view of an exhaust gas aftertreatment device of the present invention.
  • Figure 2 is a perspective view of another angle of Figure 1.
  • Figure 3 is a partial exploded perspective view of Figure 1.
  • Figure 4 is a partially exploded perspective view of another angle of Figure 3.
  • Figure 5 is an exploded perspective view of the mixer assembly of Figure 3.
  • Figure 6 is an exploded perspective view of another angle of Figure 5.
  • Figure 7 is a front elevational view of Figure 1.
  • Figure 8 is a rear elevational view of Figure 1.
  • Figure 9 is a plan view of Figure 1.
  • Fig. 10 is a bottom view of Fig. 1;
  • Figure 11 is a left side view of Figure 2.
  • Figure 12 is a right side view of Figure 2.
  • Figure 13 is a cross-sectional view taken along line A-A of Figure 9.
  • Figure 14 is a cross-sectional view taken along line B-B of Figure 9.
  • Figure 15 is a schematic cross-sectional view taken along line C-C of Figure 13;
  • the present invention discloses an exhaust aftertreatment device 100 for treating exhaust gas of an engine to reduce emissions of harmful substances.
  • the exhaust aftertreatment device 100 includes a first aftertreatment carrier assembly 1, a second aftertreatment carrier assembly 2, and a mixer assembly between the first aftertreatment carrier assembly 1 and the second aftertreatment carrier assembly 2 3.
  • the first aftertreatment carrier assembly 1, the second aftertreatment carrier assembly 2, and the mixer assembly 3 are arranged in a straight line.
  • the first aftertreatment carrier assembly 1 includes a diesel particulate filter (DPF) 12
  • the second aftertreatment carrier assembly 2 includes a selective catalytic reduction agent (SCR) 21.
  • DPF diesel particulate filter
  • SCR selective catalytic reduction agent
  • the exhaust aftertreatment device 100 further includes an oxidation catalyst (DOC) 11 located upstream of the first aftertreatment carrier assembly 12.
  • DOC oxidation catalyst
  • the above oxidation catalyst 11, diesel particulate filter 12 and selective catalytic reducing agent 21 are detachably connected by a clamp for maintenance and replacement.
  • the mixer assembly 3 includes a housing 31, a mixing tube 32 located within the housing 31, a partition 33 fixed to the periphery of the mixing tube 32, steel wool 34 located in the mixing tube 32, and a cover Board 35.
  • the partition 33 divides the casing 31 into a first space 331 that communicates with the first aftertreatment carrier assembly 1 and a second space 332 that communicates with the second aftertreatment carrier assembly 2.
  • the mixing tube 32 includes a first tube portion 321 located in the first space 331 and a second tube portion 322 located in the second space 332, wherein the first tube portion 321 is respectively disposed at two of the tubes At least two first openings 3211 on the side and a connection portion 3212 between the first openings 3211.
  • the first opening 3211 is for entering airflow.
  • the shutter 35 is welded to the connecting portion 3212, and is provided with a first shutter portion 351 and a second shutter portion 352 on both sides.
  • the first shutter portion 351 and the second shutter portion 352 respectively block the front end of the first opening 3211, so that most of the exhaust flow needs to bypass the first and second shutter portions 351, 352 can enter the first opening 3211. This arrangement prevents the exhaust stream from directly rushing into the mixing tube 32 and forming a reflection on the tube wall, affecting the uniformity and smoothness of the airflow mixing.
  • the first shutter portion 351 is provided with a first circular arc edge 3511 that abuts against the inner side of the housing 31, and the second shutter portion 352 is disposed to be placed against The second circular arc edge 3521 inside the casing 31 has an effect of obstructing the airflow to rectify.
  • the housing 31 has a cylindrical shape and is provided with a first axis 311;
  • the mixing tube 32 has a cylindrical shape, and is provided with a second axis 323, the first The axis 311 intersects the second axis 323.
  • the first axis 311 is perpendicular to the second axis 323.
  • the housing 31 and the mixing tube 32 may have other shapes, such as an elliptical shape or the like.
  • the partition plate 33 includes a first plate 333 on one side of the mixing tube 32, a second plate 334 on the other side of the mixing tube 32, and a connection between the first plate 333 and the second A third plate 335 of the plate 334, the third plate 335 is provided with a through hole 336 through which the mixing tube 32 passes.
  • the mixing tube 32 is disposed obliquely; the first plate 333 is provided with a first curved surface 337 abutting against the first tube portion 321, and the second The plate 334 is provided with a second curved surface 338 that abuts against the second tube portion 322.
  • the exhaust aftertreatment device 100 is provided with a nozzle mount 310 on the housing 31 for mounting a urea nozzle to inject a urea solution after atomization into the mixing tube 32.
  • the exhaust gas bypasses the first and second shutters 351, 352 from the first
  • the opening 3211 enters the mixing tube 32.
  • the urea nozzle injects urea into the mixing tube 32, the atomized urea droplets are mixed with the exhaust of the engine and moved downstream, then exit the mixing tube 32 and enter the second space 332, and The second post-treatment carrier assembly 2 located downstream is reached. In this way, the distance and time of urea evaporation are increased by the swirling flow, the uniformity of the airflow mixing is improved, and the risk of urea crystallization is reduced.
  • the present invention utilizes the 3D porous structure or multi-voided structure of the steel wool 34, the exhaust gas and the urea droplets passing through the steel wool 34 to cause sufficient breakage and mixing of the urea droplets on the surface and inside of the steel wool.
  • the voids are complex, 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 the evaporation and pyrolysis of the urea droplets and improving the resistance to crystallization.
  • the back pressure of the system can be adjusted accordingly by adjusting the density of the steel wool 34.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un dispositif de post-traitement de gaz d'échappement, comprenant un premier ensemble de support de post-traitement (1), un second ensemble de support de post-traitement (2), et un ensemble mélangeur (3). L'ensemble mélangeur (3) comprend un boîtier (31), et un tube de mélange (32) et une plaque de séparation (33) située à l'intérieur du boîtier (31). La plaque de séparation (33) divise le boîtier (31) en un premier espace (331) et un second espace (332). Le tube de mélange (32) comprend une première partie de tube (321) située dans le premier espace (331) et une seconde partie de tube (322) située dans le second espace (332), la première partie de tube (321) étant pourvue d'au moins de deux premières ouvertures (3211) situées sur deux côtés de celle-ci. Le dispositif de post-traitement de gaz d'échappement comprend en outre une première partie de plaque d'obturateur (351) et une seconde partie de plaque d'obturateur (352) pour bloquer respectivement les extrémités avant des premières ouvertures (3211). Au moyen de cet agencement, et en fournissant les première et seconde parties de plaque d'obturateur pour redressement, l'uniformité de distribution du flux de gaz est améliorée, et l'effet de mélange est également amélioré.
PCT/CN2018/093011 2018-01-19 2018-06-27 Dispositif de post-traitement de gaz d'échappement WO2019140865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810054166.XA CN110056414A (zh) 2018-01-19 2018-01-19 尾气后处理装置
CN201810054166.X 2018-01-19

Publications (1)

Publication Number Publication Date
WO2019140865A1 true WO2019140865A1 (fr) 2019-07-25

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WO (1) WO2019140865A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110259555A (zh) * 2019-07-31 2019-09-20 天纳克（苏州）排放***有限公司 尾气后处理装置
CN110397496A (zh) * 2019-07-31 2019-11-01 天纳克（苏州）排放***有限公司 尾气后处理装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100005790A1 (en) * 2008-07-09 2010-01-14 Xiaogang Zhang Selective Catalytic Reduction (SCR) Catalyst Injection Systems
CN106640301A (zh) * 2017-02-22 2017-05-10 天纳克（苏州）排放***有限公司 尾气后处理装置
CN206487537U (zh) * 2017-02-22 2017-09-12 天纳克（苏州）排放***有限公司 尾气后处理装置
CN107559078A (zh) * 2017-09-29 2018-01-09 天纳克汽富晟(长春)汽车零部件有限公司 尾气后处理装置
CN107575287A (zh) * 2017-09-19 2018-01-12 天纳克（苏州）排放***有限公司 尾气后处理混合装置
CN207178013U (zh) * 2017-09-19 2018-04-03 天纳克（苏州）排放***有限公司 尾气后处理混合装置
CN207526559U (zh) * 2017-09-29 2018-06-22 天纳克一汽富晟(长春)汽车零部件有限公司 尾气后处理装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100005790A1 (en) * 2008-07-09 2010-01-14 Xiaogang Zhang Selective Catalytic Reduction (SCR) Catalyst Injection Systems
CN106640301A (zh) * 2017-02-22 2017-05-10 天纳克（苏州）排放***有限公司 尾气后处理装置
CN206487537U (zh) * 2017-02-22 2017-09-12 天纳克（苏州）排放***有限公司 尾气后处理装置
CN107575287A (zh) * 2017-09-19 2018-01-12 天纳克（苏州）排放***有限公司 尾气后处理混合装置
CN207178013U (zh) * 2017-09-19 2018-04-03 天纳克（苏州）排放***有限公司 尾气后处理混合装置
CN107559078A (zh) * 2017-09-29 2018-01-09 天纳克汽富晟(长春)汽车零部件有限公司 尾气后处理装置
CN207526559U (zh) * 2017-09-29 2018-06-22 天纳克一汽富晟(长春)汽车零部件有限公司 尾气后处理装置

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