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CN208900168U - A DOC-DPF-SCR post-processing device - Google Patents

A DOC-DPF-SCR post-processing device Download PDF

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Publication number
CN208900168U
CN208900168U CN201821607111.9U CN201821607111U CN208900168U CN 208900168 U CN208900168 U CN 208900168U CN 201821607111 U CN201821607111 U CN 201821607111U CN 208900168 U CN208900168 U CN 208900168U
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Prior art keywords
dpf
doc
air inlet
intake
scr
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CN201821607111.9U
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Chinese (zh)
Inventor
闫娟
刘兴龙
高伟
李俊普
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Weichai Power Co Ltd
Weichai Power Emission Solutions Technology Co Ltd
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Weichai Power Co Ltd
Weichai Power Emission Solutions Technology Co Ltd
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Priority to CN201821607111.9U priority Critical patent/CN208900168U/en
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    • 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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  • Exhaust Gas After Treatment (AREA)

Abstract

The utility model discloses a kind of DOC-DPF-SCR after-treatment devices, including DOC, DPF, air inlet mixer, urea nozzle and SCR.Gas is handled the harmful substances such as CO, CH, PM in tail gas by DOC and DPF, treated, and tail gas enters air inlet mixer, the urea sprayed with urea nozzle mixes, after tail gas and urea are sufficiently mixed in air inlet mixer, ammonia (the NH for utilizing hydrolysis of urea to generate into SCR, SCR3) nitrogen (N is converted by the nitrogen oxides (NOx) in exhaust gas under the action of catalyst2), so that the tail gas of discharge meets Europe VI/ state VI discharge standard.This programme improves air inlet mixer, the outer tube that air inlet mixer has cyclone pipe and is sheathed on outside cyclone pipe, gas enters after air inlet mixer after the spinning disk eddy flow on cyclone pipe, broken urea granules, effectively increase the uniformity that tail gas is mixed with urea, the risk that urea is attached to cyclone pipe is reduced, urea crystals are effectively prevented, improves transformation efficiency.

Description

A kind of DOC-DPF-SCR after-treatment device
Technical field
The utility model relates to automobile technical field, in particular to a kind of DOC-DPF-SCR after-treatment device.
Background technique
Requirement with country to exhaust gas from diesel vehicle pollutant emission standard is increasingly stringenter, and in order to meet Europe VI and State's VI discharge standard is needed to particulate matter, the NO in exhaust contaminantX(nitrogen oxides), HC (hydrocarbon) and a CO (oxygen Change carbon) equal size controlled, therefore, it is necessary to by DOC (Diesel Oxidation Catalyst, oxidation catalytic converter), DPF (Diesel Particulate Filter, grain catcher) and SCR (Selective Catalytic Reduction, Selective catalytic reduction converter) it is integrated in box after-treatment device.
Wherein, DOC is that carbon monoxide in engine exhaust (CO) and hydrocarbon (HC) are converted to harmless water (H2And carbon dioxide (CO 0)2) device, applying the main function in Europe VI/ state VI emission treatment is by the oxygen in exhaust gas Change nitrogen (NO) and is oxidized to nitrogen dioxide (NO2), accelerate subsequent SCR to the conversion rate and efficiency of nitrogen oxides (NOx), Yi Jiwei The fuel oil sprayed when aoxidizing dpf regeneration promotes temperature, does early-stage preparations for dpf regeneration；
DPF catches particle by porous wall realization by alternately blocking trap carrier hole inlet and outlet forced draft Collection, up to 90% or more, PM2.5's arresting efficiency etc. being effectively reduced in exhaust gas discharges pollutants, when the trapping of DPF ash content is excessive, It needs to spray fuel oil and carries out dpf regeneration；
SCR is a kind of technology for eliminating nitrogen oxides (NOx) in diesel exhaust gas, the ammonia for utilizing hydrolysis of urea to generate (NH3) nitrogen (N is converted by the nitrogen oxides (NOx) in exhaust gas under the action of catalyst2)；
SCR catalytic muffler, SCR technology eliminate nitrogen oxides (NOx) and catalyst are needed to assist, catalyst is coated in and is carried Both it can be described as SCR catalytic muffler after being packaged on body, while by the special material of addition and structure design, can play The effect of noise elimination；
Device of the urea nozzle for the metered injection urea into SCR catalytic muffler.
Gas is handled the harmful substances such as CO, CH, PM in tail gas by DOC and DPF, and treated tail gas is immediately Into air inlet mixer, the urea sprayed with urea nozzle is mixed, and air inlet mixer needs to avoid urea crystals, to improve conversion Efficiency.
Therefore, how urea crystals are avoided, to improve transformation efficiency, becomes those skilled in the art's technology urgently to be resolved Problem.
Utility model content
In view of this, the present invention provides a kind of DOC-DPF-SCR after-treatment devices to mention to avoid urea crystals High transformation efficiency.
To achieve the above object, the utility model provides the following technical solutions:
A kind of DOC-DPF-SCR after-treatment device, comprising:
DOC, the DOC have the air intake assembly for entering the DOC for tail gas；
DPF, the DPF are connected to the DOC；
The air inlet mixer being connected to the DPF, the air inlet mixer have cyclone pipe and are sheathed on the cyclone pipe Outer outer tube；
Urea nozzle, the urea nozzle are used to spray into urea to the air inlet mixer；With
The SCR being connected to air inlet mixer.
It preferably, further include the eddy flow for being set to the eddy flow pipe end in above-mentioned DOC-DPF-SCR after-treatment device Plate, the cyclone pipe and the spiral board are respectively positioned in the outer tube.
Preferably, in above-mentioned DOC-DPF-SCR after-treatment device, the DPF by the first air inlet support plate with it is described Air inlet mixer connection, offers the first mounting hole with DPF cooperation in the first air inlet support plate, described first into The second mounting hole with air inlet mixer cooperation is offered in gas support plate；
The first air inlet end cap being connect with the first air inlet support plate, the first air inlet support plate with described first into First gas circulation passage is formed between gas end cap.
Preferably, in above-mentioned DOC-DPF-SCR after-treatment device, the first air inlet support plate and first air inlet End cap is welded to connect.
Preferably, in above-mentioned DOC-DPF-SCR after-treatment device, the air inlet mixer passes through the second air inlet support plate It is connect with the SCR, the third mounting hole with air inlet mixer cooperation is offered in the second air inlet support plate, it is described The 4th mounting hole with SCR cooperation is offered in second air inlet support plate；
The second air inlet end cap being connect with the second air inlet support plate, the second air inlet support plate with described second into Second gas circulation passage is formed between gas end cap.
Preferably, in above-mentioned DOC-DPF-SCR after-treatment device, the second air inlet support plate and second air inlet End cap is welded to connect.
Preferably, in above-mentioned DOC-DPF-SCR after-treatment device, the outer wall of the DOC, the DPF and the SCR are set It is equipped with harness-integrated.
Preferably, in above-mentioned DOC-DPF-SCR after-treatment device, the air intake assembly, which has, treats processing gas progress The cowling panel of rectification.
It can be seen from the above technical proposal that DOC-DPF-SCR after-treatment device provided by the utility model, including DOC, DPF, air inlet mixer, urea nozzle and SCR.Gas carries out the harmful substances such as CO, CH, PM in tail gas by DOC and DPF Processing, treated, and tail gas enters air inlet mixer, and the urea sprayed with urea nozzle mixes, and tail gas and urea are mixed in air inlet After being sufficiently mixed in device, the ammonia (NH of hydrolysis of urea generation is utilized into SCR, SCR3) under the action of catalyst will be in exhaust gas Nitrogen oxides (NOx) is converted into nitrogen (N2), so that the tail gas of discharge meets Europe VI/ state VI discharge standard.This programme is to air inlet Mixer is improved, and the outer tube that air inlet mixer has cyclone pipe and is sheathed on outside cyclone pipe, it is mixed that gas enters air inlet After clutchs after the spinning disk eddy flow on cyclone pipe, urea granules are crushed, the uniformity that tail gas is mixed with urea is effectively increased, The risk that urea is attached to cyclone pipe is reduced, urea crystals are effectively prevented, improves transformation efficiency.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of DOC-DPF-SCR after-treatment device provided by the embodiment of the utility model；
Fig. 2 is the explosive view of air inlet mixer provided by the embodiment of the utility model；
Fig. 3 is the structural schematic diagram of SCR provided by the embodiment of the utility model.
1, air intake assembly, 2, DPF, 3, urea nozzle, 4, air inlet mixer, the 41, first air inlet end cap, the 42, second air inlet Support plate, 43, cyclone pipe, 44, spiral board, 45, outer tube, 5, SCR, the 51, second air inlet end cap, the 52, second air inlet support plate, 53, cylinder, 6, harness-integrated.
Specific embodiment
The utility model discloses a kind of DOC-DPF-SCR after-treatment devices to improve conversion effect to avoid urea crystals Rate.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-Fig. 3 is please referred to, Fig. 1 is the structure of DOC-DPF-SCR after-treatment device provided by the embodiment of the utility model Schematic diagram；Fig. 2 is the explosive view of air inlet mixer provided by the embodiment of the utility model；Fig. 3 mentions for the utility model embodiment The structural schematic diagram of the SCR of confession.
The utility model discloses a kind of DOC-DPF-SCR after-treatment devices, including DOC, DPF2, air inlet mixer 4, urine Plain nozzle 3 and SCR5.
DOC be used for by tail gas that engine is discharged carbon monoxide CO and hydrocarbon HC be converted to harmless water H20 and carbon dioxide CO2, tail gas by air intake assembly 1 enter DOC；
After DOC processing, tail gas enters DPF2, and DPF2 traps the particle in tail gas；
Gas is handled the harmful substances such as CO, CH, PM in tail gas by DOC and DPF2, treated tail gas into Entering air inlet mixer 4, the urea sprayed with urea nozzle 3 mixes, after tail gas and urea are sufficiently mixed in air inlet mixer 4, The ammonia NH for utilizing hydrolysis of urea to generate into SCR5, SCR53The nitrogen oxide NOx in exhaust gas is converted under the action of catalyst For nitrogen N2, so that the tail gas of discharge meets Europe VI/ state VI discharge standard.
This programme improves air inlet mixer 4, and air inlet mixer 4 has cyclone pipe and is sheathed on outside cyclone pipe Outer tube 45, gas enter after air inlet mixer 4 after the spinning disk eddy flow on cyclone pipe, are crushed urea granules, effectively improve The uniformity that tail gas is mixed with urea reduces the risk that urea is attached to cyclone pipe, effectively prevents urea crystals, improves and turn Change efficiency.
In a specific embodiment of this programme, cyclone pipe is Cylindrical Cyclone pipe, and spinning disk is along Cylindrical Cyclone pipe Axial setting.
In order to further optimize the above technical scheme, the DOC-DPF-SCR after-treatment device that this programme provides further includes setting It is placed in the spiral board of eddy flow pipe end, cyclone pipe and spiral board are respectively positioned in outer tube 45.The head end of cyclone pipe is connected to DPF2, End is connect with spiral board.Gas carries out eddy flow by cyclone pipe and spiral board, effectively reduces crystallization risk.
After gas flows through DOC, DPF2, into air inlet mixer 4, air-flow enters cyclone pipe, the spinning disk rotation through cyclone pipe After stream, the urea of tail gas and the ejection of urea nozzle 3 can play good mixing, reduce urea droplets and be attached to cyclone pipe Risk effectively prevents urea crystals, and the gas for not entering cyclone pipe then enters outer tube 45 after spiral board eddy flow, makes not Tail gas into cyclone pipe is sufficiently mixed with urea, enhances tail gas and urea mixing uniformity, further improves conversion effect Rate.
In a specific embodiment of this programme, DPF2 is connect by the first air inlet support plate 42 with air inlet mixer 4, The first mounting hole with DPF2 cooperation is offered in first air inlet support plate 42, is offered in the first air inlet support plate 42 and air inlet The second mounting hole that mixer 4 cooperates；
The first air inlet end cap 41 being connect with the first air inlet support plate 42, the first air inlet support plate 42 and the first air inlet end cap First gas circulation passage is formed between 41.DOC and DPF2 treated gas enters air inlet by first gas circulation passage Mixer 4.
The shape of two ends of the first air inlet support plate 42 respectively with 4 shape adaptation of DPF2 and air inlet mixer, first The shape of air inlet cover board is identical as the shape of the first air inlet support plate 42.In a specific embodiment of this programme, first into Gas support plate 42 and the first air inlet cover board are in figure of eight shape.
In a specific embodiment of this programme, the first air inlet support plate 42 and the first air inlet end cap 41 are welded to connect.
In a specific embodiment of this programme, air inlet mixer 4 is connect by the second air inlet support plate 52 with SCR5, The third mounting hole cooperated with air inlet mixer 4 is offered in second air inlet support plate 52, is opened up in the second air inlet support plate 52 There is the 4th mounting hole with SCR5 cooperation；
The second air inlet end cap 51 being connect with the second air inlet support plate 52, the second air inlet support plate 52 and the second air inlet end cap Second gas circulation passage is formed between 51.Gas in air inlet mixer 4 enters SCR5 by second gas circulation passage.
The gas being discharged from air inlet mixer 4 is mixed again in second gas circulation passage, before increasing SCR5 Mixed volume, improve the transformation efficiency of SCR5.
The shape of two ends of the second air inlet support plate 52 respectively with 4 shape adaptation of SCR5 and air inlet mixer, second The shape of air inlet cover board is identical as the shape of the second air inlet support plate 52.In a specific embodiment of this programme, second into Gas support plate 52 and the second air inlet cover board are in figure of eight shape.
Second air inlet cover board can improve versatility along 360 ° of axis direction rotations of the cylinder 53 of SCR5.
In a specific embodiment of this programme, the second air inlet support plate 52 and the second air inlet end cap 51 are welded to connect.
The side opposite with air inlet mixer 4 of first air inlet end cap 41 and the second air inlet end cap 51 is designed as by this programme Planar structure, production is simple, reduces the manufacture difficulty of the first air inlet end cap 41 and the second air inlet end cap 51, while in order to enhance It is arranged on the use intensity of first air inlet end cap 41 and the second air inlet end cap 51, the first air inlet end cap 41 and the second air inlet end cap 51 There is reinforcing rib.
The outer wall of DOC, DPF2 and SCR5 are provided with harness-integrated 6.Harness-integrated 6 arrangement and move towards design, simplify Harness type of attachment collects in the connector of more sensors finally at one, reduces the risk of wrong connector in installation process, Reduce the quantity to plug, facilitate the harness of main engine plants to inserting, meets the arrangement demand and installation matching of vehicle, improve Production efficiency.
In the DOC-DPF-SCR after-treatment device that this programme provides, the air intake assembly 1 of DOC have treat processing gas into The air-flow irregularly flowed can be become the air-flow of regular flow by the cowling panel of row rectification, cowling panel, enhancing tail gas mixing Uniformity improves the transformation efficiency of subsequent gases reaction.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The widest scope consistent with features of novelty.

Claims (8)

1.一种DOC-DPF-SCR后处理装置，其特征在于，包括：1. a DOC-DPF-SCR post-processing device, is characterized in that, comprises: DOC，所述DOC具有供尾气进入所述DOC的进气组件(1)；DOC, the DOC has an intake assembly (1) for exhaust gas to enter the DOC; DPF(2)，所述DPF(2)与所述DOC连通；DPF (2), the DPF (2) communicates with the DOC; 与所述DPF(2)连通的进气混合器(4)，所述进气混合器(4)具有旋流管和套设于所述旋流管外的外层管(45)；an intake air mixer (4) in communication with the DPF (2), the intake air mixer (4) having a swirling tube and an outer layer tube (45) sleeved outside the swirling tube; 尿素喷嘴(3)，所述尿素喷嘴(3)用于向所述进气混合器(4)喷入尿素；和a urea nozzle (3) for injecting urea into the intake mixer (4); and 与进气混合器(4)连通的所述SCR(5)。The SCR (5) communicates with the intake air mixer (4). 2.根据权利要求1所述的DOC-DPF-SCR后处理装置，其特征在于，还包括设置于所述旋流管末端的旋流板，所述旋流管和所述旋流板均位于所述外层管(45)内。2 . The DOC-DPF-SCR post-processing device according to claim 1 , further comprising a swirl plate disposed at the end of the swirl pipe, wherein the swirl pipe and the swirl plate are both located at the end of the swirl pipe. 3 . inside the outer tube (45). 3.根据权利要求1所述的DOC-DPF-SCR后处理装置，其特征在于，所述DPF(2)通过第一进气支撑板(42)与所述进气混合器(4)连接，所述第一进气支撑板(42)上开设有与所述DPF(2)配合的第一安装孔，所述第一进气支撑板(42)上开设有与所述进气混合器(4)配合的第二安装孔；3. The DOC-DPF-SCR aftertreatment device according to claim 1, wherein the DPF (2) is connected to the intake air mixer (4) through a first intake air support plate (42), The first air intake support plate (42) is provided with a first installation hole matched with the DPF (2), and the first air intake support plate (42) is provided with the air intake mixer ( 4) The matching second mounting hole; 与所述第一进气支撑板(42)连接的第一进气端盖(41)，所述第一进气支撑板(42)与所述第一进气端盖(41)之间形成第一气体流通通道。A first intake end cover (41) connected to the first intake support plate (42), and a first intake end cover (41) is formed between the first intake support plate (42) and the first intake end cover (41) The first gas circulation channel. 4.根据权利要求3所述的DOC-DPF-SCR后处理装置，其特征在于，所述第一进气支撑板(42)与所述第一进气端盖(41)焊接连接。4 . The DOC-DPF-SCR aftertreatment device according to claim 3 , wherein the first intake support plate ( 42 ) is connected to the first intake end cover ( 41 ) by welding. 5 . 5.根据权利要求1所述的DOC-DPF-SCR后处理装置，其特征在于，所述进气混合器(4)通过第二进气支撑板(52)与所述SCR(5)连接，所述第二进气支撑板(52)上开设有与所述进气混合器(4)配合的第三安装孔，所述第二进气支撑板(52)上开设有与所述SCR(5)配合的第四安装孔；5. The DOC-DPF-SCR aftertreatment device according to claim 1, wherein the intake air mixer (4) is connected to the SCR (5) through a second intake air support plate (52), The second air intake support plate (52) is provided with a third installation hole matched with the air intake mixer (4), and the second air intake support plate (52) is provided with the SCR ( 5) The matching fourth mounting hole; 与所述第二进气支撑板(52)连接的第二进气端盖(51)，所述第二进气支撑板(52)与所述第二进气端盖(51)之间形成第二气体流通通道。A second intake end cover (51) connected to the second intake support plate (52), and a second intake end cover (51) is formed between the second intake support plate (52) and the second intake end cover (51). The second gas circulation channel. 6.根据权利要求5所述的DOC-DPF-SCR后处理装置，其特征在于，所述第二进气支撑板(52)与所述第二进气端盖(51)焊接连接。6 . The DOC-DPF-SCR aftertreatment device according to claim 5 , wherein the second intake support plate ( 52 ) is connected to the second intake end cover ( 51 ) by welding. 7 . 7.根据权利要求1所述的DOC-DPF-SCR后处理装置，其特征在于，所述DOC、所述DPF(2)和所述SCR(5)的外壁设置有集成线束(6)。7. The DOC-DPF-SCR post-processing device according to claim 1, characterized in that, an integrated wiring harness (6) is provided on the outer walls of the DOC, the DPF (2) and the SCR (5). 8.根据权利要求1所述的DOC-DPF-SCR后处理装置，其特征在于，所述进气组件(1)具有对待处理气体进行整流的整流板。8 . The DOC-DPF-SCR aftertreatment device according to claim 1 , wherein the air intake assembly ( 1 ) has a rectifying plate for rectifying the gas to be treated. 9 .
CN201821607111.9U 2018-09-29 2018-09-29 A DOC-DPF-SCR post-processing device Active CN208900168U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110925062A (en) * 2019-12-19 2020-03-27 无锡亿利环保科技有限公司 Urea mixer and post-treatment device
CN111764987A (en) * 2020-06-29 2020-10-13 东风商用车有限公司 Post-processing packaging SCR mixer system and processing method thereof
CN114961930A (en) * 2021-06-11 2022-08-30 无锡威孚力达催化净化器有限责任公司 High-efficient hybrid piping installation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110925062A (en) * 2019-12-19 2020-03-27 无锡亿利环保科技有限公司 Urea mixer and post-treatment device
CN111764987A (en) * 2020-06-29 2020-10-13 东风商用车有限公司 Post-processing packaging SCR mixer system and processing method thereof
CN111764987B (en) * 2020-06-29 2023-10-13 东风商用车有限公司 Post-treatment packaging SCR mixer system and treatment method thereof
CN114961930A (en) * 2021-06-11 2022-08-30 无锡威孚力达催化净化器有限责任公司 High-efficient hybrid piping installation

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