CN109973185B - Exhaust mixing structure for diesel engine tail gas aftertreatment - Google Patents

Exhaust mixing structure for diesel engine tail gas aftertreatment Download PDF

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Publication number
CN109973185B
CN109973185B CN201910211812.3A CN201910211812A CN109973185B CN 109973185 B CN109973185 B CN 109973185B CN 201910211812 A CN201910211812 A CN 201910211812A CN 109973185 B CN109973185 B CN 109973185B
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cavity
doc
dpf
mixing
pipe
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CN109973185A (en
Inventor
陈霍
蒋得刚
万涛
王智晶
华晨
马纪权
马淮
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Suzhou Nse Automotive Electronics Co ltd
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Suzhou Nse Automotive Electronics Co ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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

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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)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides an exhaust mixing structure for diesel engine exhaust aftertreatment, which comprises a DOC component and a DPF component which are connected up and down, wherein: the DOC component comprises a DOC cavity, a DOC air inlet pipe and a urea mixing pipe, wherein a DOC uniformity mixing cavity, a DOC catalysis cavity and a DOC urea mixing cavity are sequentially formed in the DOC cavity, the DOC air inlet pipe is connected to the uniformity mixing cavity and communicated with the uniformity mixing cavity, the urea mixing pipe penetrates through the DOC urea mixing cavity, and a urea nozzle is arranged at the upper end of the urea mixing pipe; the DPF assembly comprises a DPF cavity, a DPF uniformity mixing cavity, a DPF catalysis cavity and a DPF air outlet cavity are formed in the DPF cavity in sequence, a DPF air inlet pipe is connected to the DPF uniformity mixing cavity, the DPF air inlet pipe is connected with the lower end of the urea mixing pipe, and the DPF air outlet cavity is connected with the SCR assembly of a subsequent channel through a pipeline. The invention obviously improves the uniformity of ammonia in the gas to be treated and ensures the reduction treatment effect of SCR.

Description

Exhaust mixing structure for diesel engine tail gas aftertreatment
Technical Field
The invention relates to the field of automobile exhaust treatment, in particular to an exhaust mixing structure for diesel engine exhaust aftertreatment.
Background
A diesel engine after-treatment structure of a vehicle is used for purifying exhaust gas of a diesel engine, and generally includes DOC (oxidation catalyst), DPF (diesel particulate trap), SCR (selective catalytic reduction), and the like.
In the automobile exhaust aftertreatment, the uniformity of the distribution of ammonia in the gas to be treated has an important influence on the overall performance and durability of the system, and if the ammonia distribution is not uniform due to unreasonable structure, the nitrogen oxide (NOx) conversion efficiency is too low.
Disclosure of Invention
The invention provides an exhaust mixing structure for diesel engine exhaust aftertreatment, which integrates a DOC component and a DPF component into a compact integral structure and can ensure that ammonia and gas to be treated are fully and uniformly mixed so as to ensure the exhaust treatment effect.
The specific technical scheme of the invention is as follows:
an exhaust mixing structure for diesel engine exhaust aftertreatment, which includes a DOC component and a DPF component connected up and down, wherein: DOC subassembly includes DOC cavity, DOC intake pipe and urea hybrid tube, DOC homogeneity hybrid chamber, DOC catalysis chamber and DOC urea hybrid chamber form in proper order in the DOC cavity, DOC intake-tube connection in on the homogeneity hybrid chamber and with homogeneity hybrid chamber intercommunication, the urea hybrid tube runs through DOC urea hybrid chamber, the upper end of urea hybrid tube is provided with the urea nozzle. The DPF assembly comprises a DPF cavity, a DPF uniformity mixing cavity, a DPF catalysis cavity and a DPF air outlet cavity are formed in the DPF cavity in sequence, a DPF air inlet pipe is connected to the DPF uniformity mixing cavity, the DPF air inlet pipe is connected with the lower end of the urea mixing pipe, and the DPF air outlet cavity is connected with the SCR assembly of a subsequent channel through a pipeline.
In some embodiments, a plurality of long and narrow swirl channels are circumferentially arranged in the middle of the tube wall of the urea mixing tube, the swirl channels extend axially, each tapered swirl channel is provided with an outward-inclined swirl plate, and each swirl plate is inclined in the same direction.
In some embodiments, the swirl passage is a tapered structure, and the width of the swirl passage is gradually reduced from top to bottom.
In some embodiments, the upper end of the tube wall of the urea mixing tube is circumferentially formed with a plurality of upper vent holes, and the lower end of the urea mixing tube is circumferentially formed with a plurality of lower vent holes.
In some specific embodiments, be equipped with in the DOC homogeneity hybrid chamber and run through the inlet mixing pipe of DOC homogeneity hybrid chamber, the inlet end of inlet mixing pipe with DOC intake pipe intercommunication, it has a plurality of air vents to gather on the pipe wall of inlet mixing pipe.
Compared with the aftertreatment structure in the prior art, the exhaust mixing structure for aftertreatment of the tail gas of the diesel engine can realize the sufficient and uniform mixing of the gas to be treated and ammonia, remarkably improves the uniformity of the ammonia in the gas to be treated, and ensures the reduction treatment effect of SCR.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings which are needed in the embodiments and are practical will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. Wherein the content of the first and second substances,
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic perspective view of a urea mixing pipe according to the present invention;
FIG. 3 is a sectional view A-A of FIG. 2;
FIG. 4 is a schematic diagram showing the swirling effect of the urea mixing tube according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Referring to fig. 1, the exhaust mixing structure for diesel engine exhaust aftertreatment provided by the invention comprises a DOC assembly and a DPF assembly which are connected up and down. Wherein:
DOC subassembly includes DOC cavity 1, DOC intake pipe 2 and urea hybrid tube 3, form DOC homogeneity hybrid chamber 11, DOC catalysis chamber 12 and DOC urea hybrid chamber 13 in the DOC cavity 1 in proper order, DOC intake pipe 2 is connected on the homogeneity hybrid chamber 11 and with 11 intercommunications in the homogeneity hybrid chamber, urea hybrid tube 3 runs through DOC urea hybrid chamber 13, the upper end of urea hybrid tube 3 is provided with urea nozzle 4.
The gas to be treated enters the DOC uniformity mixing chamber 11 through the DOC gas inlet pipe 2 and is uniformly mixed in the DOC uniformity mixing chamber 11.
In some preferred embodiments, an air inlet mixing pipe 7 penetrating through the DOC uniformity mixing cavity 11 is arranged in the DOC uniformity mixing cavity 11, an air inlet end of the air inlet mixing pipe 7 is communicated with the DOC air inlet pipe 2, and a plurality of vent holes are densely distributed on the pipe wall of the air inlet mixing pipe 7. The DOC air inlet pipe 2 is connected with the DOC uniformity mixing chamber 11, and the DOC uniformity mixing chamber 11 is connected with the air inlet mixing pipe 7.
The mixed gas to be treated flows into the DOC catalytic cavity 12, and hydrocarbon, carbon monoxide and the like in the gas to be treated chemically react with oxygen under the catalysis of a metal or ceramic catalyst to generate pollution-free H2O and CO2. Then, the gas after DOC treatment flows into the DOC urea mixing cavity 13 and enters the urea mixing pipe 3, meanwhile, the urea nozzle 4 sprays the foggy urea solution into the urea mixing pipe 3, the gas to be treated meets and mixes with urea, and finally leaves the DOC component 1 through the lower end outlet of the urea mixing pipe 3.
In some embodiments, as shown in fig. 2 and 3, the middle of the wall of the urea mixing pipe 3 is provided with a plurality of elongated swirl passages 31 along the circumferential direction, the swirl passages 31 extend along the axial direction, each swirl passage 31 is provided with an outward inclined swirl plate 32, and each swirl plate 32 is inclined in the same direction (e.g. clockwise). The urea mixing pipe 3 can produce the following technical effects: the gas treated by DOC enters the DOC-urea mixing cavity 13 and then enters the urea mixing pipe 3 through the rotational flow passage 31, and in the process, as shown in fig. 4, a strong rotational flow is formed in the urea mixing pipe 3. At the moment, after the atomized urea solution is sprayed into the urea mixing pipe 3 through the urea nozzle 4, the urea solution is rapidly evaporated and pyrolyzed under the rapid stirring of the rotational flow, so that the urea solution and the gas to be treated are fully and uniformly mixed.
Preferably, the swirling flow passage 31 is provided in a tapered structure, and the width thereof is gradually reduced from top to bottom. The upper part of the swirling flow channel 31 is wide, so that the urea solution injected into the urea mixing pipe 3 can be fully spread, and the lower part of the swirling flow channel 31 is gradually narrowed, so that the flow and decomposition of the urea solution can be accelerated.
Further, in some preferred embodiments, the upper end of the tube wall of the urea mixing tube 3 is circumferentially formed with a plurality of upper vent holes 33, and the lower end of the urea mixing tube 3 is circumferentially formed with a plurality of lower vent holes 34. The upper vent hole 33 can further improve the diffusion effect of the urea solution, and the lower vent hole 34 can introduce airflow to sweep the lower end of the urea mixing pipe 3 to prevent the lower end from urea crystallization.
The DPF assembly comprises a DPF cavity 5, a DPF uniformity mixing cavity 51, a DPF catalysis cavity 52 and a DPF air outlet cavity 53 are formed in the DPF cavity in sequence, a DPF air inlet pipe 6 is connected to the DPF uniformity mixing cavity 53, the DPF air inlet pipe 6 is connected with the lower end of the urea mixing pipe 3, and the DPF air outlet cavity 53 is connected with the SCR assembly of a later channel through a pipeline.
The mixed gas discharged through the urea mixing pipe 3 enters the DPF uniformity mixing chamber 51 and is further uniformly mixed. Then, the mixture gas flows into the DPF catalyst chamber 52, and particulate matter therein is trapped by the catalyst in the DPF catalyst chamber 52. Finally, the gas treated by DPF is discharged through the DPF outlet chamber 53, and enters a subsequent SCR treatment process to remove NO therefromX。
Therefore, after the treatment of the invention, the uniformity of ammonia in the mixed gas entering the subsequent SCR is obviously improved, thereby ensuring the reduction treatment effect of the SCR.
The invention has been described above with a certain degree of particularity. It will be understood by those of ordinary skill in the art that the description of the embodiments is merely exemplary and that all changes that come within the true spirit and scope of the invention are desired to be protected. The scope of the invention is defined by the appended claims rather than by the foregoing description of the embodiments.

Claims (2)

1. An exhaust mixing structure for diesel engine exhaust aftertreatment, which includes a DOC component and a DPF component connected up and down, wherein:
the DOC component comprises a DOC cavity, a DOC air inlet pipe and a urea mixing pipe, wherein a DOC uniformity mixing cavity, a DOC catalysis cavity and a DOC urea mixing cavity are sequentially formed in the DOC cavity, the DOC air inlet pipe is connected to the uniformity mixing cavity and communicated with the uniformity mixing cavity, the urea mixing pipe penetrates through the DOC urea mixing cavity, and a urea nozzle is arranged at the upper end of the urea mixing pipe;
the DPF assembly comprises a DPF cavity, a DPF uniformity mixing cavity, a DPF catalysis cavity and a DPF outlet cavity are sequentially formed in the DPF cavity, a DPF inlet pipe is connected to the DPF uniformity mixing cavity, the DPF inlet pipe is connected with the lower end of the urea mixing pipe, and the DPF outlet cavity is connected with a rear SCR assembly through a pipeline;
the middle part of the pipe wall of the urea mixing pipe is circumferentially provided with a plurality of long and narrow rotational flow channels, the rotational flow channels axially extend, each rotational flow channel is provided with an outward inclined rotational flow sheet, and the rotational flow sheets are inclined in the same direction;
the cyclone channel is of a tapered structure, and the width of the cyclone channel is gradually reduced from top to bottom;
the upper end of the pipe wall of the urea mixing pipe is circumferentially provided with a plurality of upper vent holes, and the lower end of the urea mixing pipe is circumferentially provided with a plurality of lower vent holes.
2. The exhaust mixing structure according to claim 1, wherein: be equipped with in the DOC homogeneity hybrid chamber and run through the inlet mixing tube of DOC homogeneity hybrid chamber, inlet mixing tube's inlet end with DOC intake pipe intercommunication, it has a plurality of air vents to gather on inlet mixing tube's the pipe wall.
CN201910211812.3A 2019-03-20 2019-03-20 Exhaust mixing structure for diesel engine tail gas aftertreatment Active CN109973185B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140023696A (en) * 2012-08-17 2014-02-27 세종공업 주식회사 Post treatment exhaust contamination gas decreasing system in diesel engine
GB2521425A (en) * 2013-12-19 2015-06-24 Gm Global Tech Operations Inc Exhaust system for a diesel engine
CN204961027U (en) * 2015-09-11 2016-01-13 北汽福田汽车股份有限公司 Post processor , After treatment system and vehicle
CN106855006A (en) * 2015-12-08 2017-06-16 安徽艾可蓝节能环保科技有限公司 One kind mixing disturbing flow device
CN107701270A (en) * 2017-08-09 2018-02-16 宝沃汽车（中国）有限公司 Determination method for the blender of vehicle, gas extraction system and blender
CN207989115U (en) * 2018-01-26 2018-10-19 天纳克（苏州）排放***有限公司 Exhaust gas post-treatment device
CN208153104U (en) * 2018-03-12 2018-11-27 潍柴动力股份有限公司 A kind of compact DOC-DPF-SCR after-treatment device
CN109268114A (en) * 2018-11-21 2019-01-25 苏州国方汽车电子有限公司 A kind of flow mixer for SCR system exhaust aftertreatment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106246303B (en) * 2016-10-12 2019-01-15 天纳克（苏州）排放***有限公司 Tail-gas after treatment apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140023696A (en) * 2012-08-17 2014-02-27 세종공업 주식회사 Post treatment exhaust contamination gas decreasing system in diesel engine
GB2521425A (en) * 2013-12-19 2015-06-24 Gm Global Tech Operations Inc Exhaust system for a diesel engine
CN204961027U (en) * 2015-09-11 2016-01-13 北汽福田汽车股份有限公司 Post processor , After treatment system and vehicle
CN106855006A (en) * 2015-12-08 2017-06-16 安徽艾可蓝节能环保科技有限公司 One kind mixing disturbing flow device
CN107701270A (en) * 2017-08-09 2018-02-16 宝沃汽车（中国）有限公司 Determination method for the blender of vehicle, gas extraction system and blender
CN207989115U (en) * 2018-01-26 2018-10-19 天纳克（苏州）排放***有限公司 Exhaust gas post-treatment device
CN208153104U (en) * 2018-03-12 2018-11-27 潍柴动力股份有限公司 A kind of compact DOC-DPF-SCR after-treatment device
CN109268114A (en) * 2018-11-21 2019-01-25 苏州国方汽车电子有限公司 A kind of flow mixer for SCR system exhaust aftertreatment

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