WO2017215460A1 - Appareil de mélange pour post-traitement de gaz d'échappement - Google Patents

Appareil de mélange pour post-traitement de gaz d'échappement Download PDF

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Publication number
WO2017215460A1
WO2017215460A1 PCT/CN2017/086993 CN2017086993W WO2017215460A1 WO 2017215460 A1 WO2017215460 A1 WO 2017215460A1 CN 2017086993 W CN2017086993 W CN 2017086993W WO 2017215460 A1 WO2017215460 A1 WO 2017215460A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
outer tube
exhaust gas
tube
cavity
Prior art date
Application number
PCT/CN2017/086993
Other languages
English (en)
Chinese (zh)
Inventor
王聪
童毅君
陈智
毛伟
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 WO2017215460A1 publication Critical patent/WO2017215460A1/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
    • F01N3/24—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
    • F01N3/24—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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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

Definitions

  • the invention relates to an exhaust gas post-treatment mixing device, 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, a mixing assembly located in the casing, and a partition plate cooperating with the mixing assembly, wherein the casing Providing a mount for mounting a urea nozzle to inject urea into the mixing assembly, the partition separating the housing into a first cavity in communication with the inlet and a second cavity in communication with the outlet,
  • the mixing assembly includes an inner tube, a dispensing body mated with the inner tube, an outer tube at a periphery of the inner tube, and an end cap cooperating with the outer tube, the inner tube being disposed in the first chamber a first tube body in the body and a second tube body extending into the second chamber body, the wall surface of the first tube body is provided with a plurality of swirling sheets, and the wall surface of the second tube body is provided with a gas flow through a plurality of first perforations;
  • the distribution body is provided with a plurality of through holes through which the
  • the partition plate comprises a first plate on one side of the mixing component, located at the a second plate on the other side of the mixing assembly and a third plate connecting the first plate and the second plate, the third plate being provided with a mounting hole through which the mixing assembly passes .
  • the partition plate has a substantially Z shape, and the first plate piece and the second plate piece both extend vertically and extend in opposite directions, and the third plate piece extends horizontally.
  • the third plate is provided with a slot at a periphery of the mounting hole, and the slot communicates with the first cavity and the second cavity.
  • the first tube body includes a plurality of openings in an upper portion of the swirling sheet, the opening holes being adjacent to the mounting seat and communicating with the first cavity.
  • the outer tube is in close contact with the second plate.
  • the second plate is provided with a slot, and the outer tube at least partially protrudes from the slot to be directly exposed in the first cavity.
  • the distribution body is fixed at the bottom of the first pipe body.
  • the distribution body has an arc shape.
  • the end cap is provided with a protrusion protruding into the second tube body for forcing a reverse flow of the airflow.
  • the dispensing body is located above the end cap and spaced apart from the end cap in a vertical direction.
  • the present invention improves the mixing uniformity of the exhaust gas and the urea droplet by providing the swirling sheet; by setting the distribution body, the urea droplet is broken smaller, and the atomization and mixing effect of the urea is improved; In addition, by providing the inner tube and the outer tube, and forcing the flow of the gas to flow backward through the end cap, the distance and time of evaporation of the urea are increased, and the uniformity of the airflow mixing is improved.
  • Figure 1 is a schematic perspective view of a tail gas aftertreatment mixing device of the present invention.
  • Fig. 2 is an exploded perspective view of Fig. 1;
  • Figure 3 is a left side view of Figure 1.
  • Figure 4 is a cross-sectional view taken along line A-A of Figure 3.
  • Figure 5 is a cross-sectional view taken along line B-B of Figure 3.
  • Figure 6 is a rear elevational view of Figure 1.
  • Figure 7 is a cross-sectional view taken along line C-C of Figure 6.
  • Figure 8 is an exploded perspective view of another embodiment of the exhaust aftertreatment mixing device of the present invention.
  • Figure 9 is a schematic cross-sectional view of the exhaust aftertreatment mixing device of Figure 8 taken along an angle.
  • 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, a mixing assembly 2 mounted in the housing 1, and a partition 3 cooperating with the mixing assembly 2.
  • 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 into the mixing assembly 2.
  • the partition 3 divides the casing 1 into a first cavity 13 in communication with the inlet and a second cavity 14 in communication with the outlet.
  • the partition 3 is substantially Z-shaped, comprising a first plate 31 on one side of the mixing assembly 2 and a second plate on the other side of the mixing assembly 2 A sheet 32 and a third sheet 33 connecting the first sheet 31 and the second sheet 32.
  • the first plate 31 and the second plate 32 both extend vertically and extend in opposite directions.
  • the third plate 33 extends horizontally.
  • the third plate 33 is provided with a mounting hole 331 through which the mixing assembly 2 passes and a slot 332 at the periphery of the mounting hole 331.
  • the mixing assembly 2 includes an inner tube 21, a dispensing body 22 that mates with the inner tube 21, an outer tube 23 at the periphery of the inner tube 21, and an end cap 24 that mates with the outer tube 23.
  • the inner tube 21 is provided with a first tube body 211 located in the first cavity 13 and a second tube body 212 extending into the second cavity body 14.
  • the wall surface of the first pipe body 211 is provided with a plurality of swirling fins 2111 and a plurality of openings 2112 located at an upper portion of the swirling fins 2111.
  • the swirling sheet 2111 is located inside the first cavity 13.
  • the opening 2112 is adjacent to the mounting seat 12 and is in communication with the first cavity 13 .
  • the slot 332 communicates with the first cavity 13 and the second cavity 14, and the slot 332 can blow the airflow through the inner wall of the outer tube 23 to blow away crystals, thereby reducing the risk of crystallization.
  • the wall surface of the first pipe body 211 has a truncated cone shape.
  • the wall surface of the second pipe body 212 is provided with a plurality of first perforations 2121 through which the airflow passes.
  • the distribution body 22 is provided with a plurality of through holes 221 through which the airflow passes.
  • the outer tube 23 is located at the outer periphery of the second tube 212, and the wall of the outer tube 23 is provided with a plurality of second perforations 231 for airflow.
  • the end cap 24 is located at the bottom of the outer tube 23 to force the flow of gas to flow in the opposite direction.
  • the dispensing body 22 is secured to the bottom of the first tubular body 211.
  • the distribution body 22 has an arc shape.
  • the end cap 24 is provided with a projection 241 that projects into the second tubular body 212 and forces the airflow to flow in the opposite direction.
  • the dispensing body 22 is located above the end cap 24 and is spaced apart from the end cap 24 in a vertical direction.
  • the wall surface of the outer tube 23 is in close contact with the second plate 32.
  • the size required for the arrangement can be reduced; on the other hand, the second sheet 32 and the outer tube 23 can be heated by the exhaust gas, thereby further reducing the risk of forming urea crystals in the outer tube 23. .
  • the urea nozzle injects urea into the mixing assembly 2, and the atomized urea droplets are mixed with the exhaust gas of the engine and rotated downward.
  • the plurality of through holes 221 of the distribution body 22 can break the urea hit thereon into smaller droplets, thereby improving the atomization and mixing effect of the urea.
  • the flow of gas is forced to reverse (e.g., upward) by the action of the end cap 24.
  • the airflow after the reverse passes through the first perforation 2121 and/or the second perforation 231 and exits the outlet.
  • This arrangement increases the distance and time of urea evaporation, improves the uniformity of airflow mixing, and reduces the risk of urea crystallization.
  • the second plate 32 is provided with a slot 321 .
  • the outer tube 23 After the outer tube 23 is assembled with the second plate 32, the outer tube 23 at least partially protrudes from the slot 321 .
  • the wall portion of the outer tube 23 directly exposed to the first cavity 13 can be heated by the exhaust gas, thereby further reducing the risk of forming urea crystals in the outer tube 23.

Landscapes

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

Abstract

Un appareil de mélange pour post-traitement de gaz d'échappement, comprenant un boitier, un ensemble de mélange situé dans le boitier, et une cloison. La cloison divise le boitier en une première chambre en communication avec une entrée et une seconde chambre en communication avec une sortie. L'ensemble de mélange comprend un tube interne, un corps de distribution, un tube externe et un capuchon d'extrémité. Le tube interne est pourvu d'un premier corps tubulaire situé dans la première chambre et d'un second corps tubulaire s'étendant dans la seconde chambre. La paroi du premier corps tubulaire est pourvue de plusieurs feuilles d'écoulement rotatives, et la paroi du second corps tubulaire est pourvue de plusieurs premières perforations à travers lesquelles passe l'écoulement d'air. Le corps de distribution est pourvu de plusieurs trous traversants à travers lesquels le flux d'air passe. Le tube externe est situé sur la périphérie du second corps tubulaire, et la paroi du tube externe est pourvue de plusieurs secondes perforations à travers lesquelles le flux d'air passe. Le capuchon d'extrémité est situé au fond du tube externe et est utilisé pour forcer l'inversion du flux d'air. Un tel agencement augmente la distance et le temps d'évaporation de l'urée, et améliore l'uniformité du mélange de flux d'air.
PCT/CN2017/086993 2016-06-13 2017-06-02 Appareil de mélange pour post-traitement de gaz d'échappement WO2017215460A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610422729.7A CN107489502B (zh) 2016-06-13 2016-06-13 尾气后处理混合装置
CN201610422729.7 2016-06-13

Publications (1)

Publication Number Publication Date
WO2017215460A1 true WO2017215460A1 (fr) 2017-12-21

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WO (1) WO2017215460A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3566765A1 (fr) * 2018-05-07 2019-11-13 Dinex A/S Système de mélange d'échappement compact
CN110848007A (zh) * 2019-12-19 2020-02-28 无锡亿利环保科技有限公司 尿素混合装置
CN115382412A (zh) * 2022-08-02 2022-11-25 浙江邦得利环保科技股份有限公司 一种高效混合器

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CN106437968B (zh) * 2016-10-24 2019-06-28 无锡威孚力达催化净化器有限责任公司 一体波浪式旋流尿素混合装置

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CN105275554A (zh) * 2015-10-21 2016-01-27 西安交通大学 带排气混合器的scr后处理装置
CN205243598U (zh) * 2015-12-18 2016-05-18 天纳克（苏州）排放***有限公司 发动机排气后处理装置
CN105464765A (zh) * 2015-12-30 2016-04-06 广西玉柴机器股份有限公司 应用于尾气后处理中的混合器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008208726A (ja) * 2007-02-23 2008-09-11 Hino Motors Ltd 排気浄化装置
DE102009036511A1 (de) * 2009-08-07 2011-02-10 Friedrich Boysen Gmbh & Co. Kg Abgasanlage
US20150071828A1 (en) * 2013-05-07 2015-03-12 Tenneco Automotive Operating Company Inc. Exhaust mixing assembly
CN103321724A (zh) * 2013-07-09 2013-09-25 潍柴动力股份有限公司 Scr催化***及其混合管装置
CN204646380U (zh) * 2015-05-13 2015-09-16 天纳克（苏州）排放***有限公司 双层混合管及其排气处理装置
CN204827615U (zh) * 2015-07-27 2015-12-02 天纳克（苏州）排放***有限公司 双层混合管及其排气后处理装置
CN205714373U (zh) * 2016-06-13 2016-11-23 天纳克（苏州）排放***有限公司 尾气后处理混合装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3566765A1 (fr) * 2018-05-07 2019-11-13 Dinex A/S Système de mélange d'échappement compact
WO2019215081A1 (fr) * 2018-05-07 2019-11-14 Dinex A/S Système de mélange d'échappement compact
CN111727083A (zh) * 2018-05-07 2020-09-29 迪耐斯集团 紧凑废气混合***
CN111727083B (zh) * 2018-05-07 2022-12-27 迪耐斯集团 紧凑废气混合***
CN110848007A (zh) * 2019-12-19 2020-02-28 无锡亿利环保科技有限公司 尿素混合装置
CN115382412A (zh) * 2022-08-02 2022-11-25 浙江邦得利环保科技股份有限公司 一种高效混合器
CN115382412B (zh) * 2022-08-02 2024-04-09 浙江邦得利环保科技股份有限公司 一种高效混合器

Also Published As

Publication number Publication date
CN108915830A (zh) 2018-11-30
CN107489502A (zh) 2017-12-19
CN107489502B (zh) 2020-06-30
CN108915830B (zh) 2019-11-08

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