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CN202039923U - Exhaust device with waste gas after-treatment system - Google Patents

Exhaust device with waste gas after-treatment system Download PDF

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Publication number
CN202039923U
CN202039923U CN2010205334152U CN201020533415U CN202039923U CN 202039923 U CN202039923 U CN 202039923U CN 2010205334152 U CN2010205334152 U CN 2010205334152U CN 201020533415 U CN201020533415 U CN 201020533415U CN 202039923 U CN202039923 U CN 202039923U
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exhaust gas
reducing agent
particle
particle separator
exhaust
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CN2010205334152U
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G·泽瓦尔德
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AVL List GmbH
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AVL List GmbH
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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
    • 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
    • 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
    • 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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • 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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  • 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)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

本实用新型所涉及的排气装置(1)，带有一个用于减少氮氧化物和固体颗粒的废气后处理系统，带有至少一个用于减少氮氧化物的SCR-催化器(4)，还带有至少一个安置于SCR-催化器(4)上游用于减少固体颗粒的颗粒分离器(或颗粒过滤器)(3)，而在颗粒分离器(或颗粒过滤器)(3)的上游安置有针对还原剂(6)的配量装置(5)。为尽可能简单地实现还原剂(6)的精细分配，并使经过初步过滤的废气在进入再循环时不含还原剂，而在颗粒分离器(或颗粒过滤器)(3)的下游设置有针对废气再循环管路(8)的支路(9)，且在排气管路(7)的配量装置区(5)安置有一块原则上与废气流同向的导流板(11)。其中，导流板(11)将流经颗粒分离器(或颗粒过滤器)(3)的废气流分成两路，即富含还原剂的第一废气支路(12)和缺少还原剂的第二废气支路(13)，且导流装置(11)优先安置在还原剂(6)(由配量装置(5)引入)的喷射区域。在配量装置(5)与颗粒分离器(或颗粒过滤器)(3)之间，可优选安置一个水解催化器(14)。

Figure 201020533415

The exhaust device (1) according to the utility model has an exhaust gas aftertreatment system for reducing nitrogen oxides and solid particles, with at least one SCR-catalyst (4) for reducing nitrogen oxides, There is also at least one particle separator (or particle filter) (3) arranged upstream of the SCR-catalyst (4) for reducing solid particles, and upstream of the particle separator (or particle filter) (3) A dosing device (5) for the reducing agent (6) is arranged. In order to achieve a fine distribution of the reducing agent (6) as simply as possible and to make the pre-filtered exhaust gas free of reducing agent when it enters the recirculation, a particle separator (or particle filter) (3) is provided downstream of the For the branch (9) of the exhaust gas recirculation line (8), and in the dosing device area (5) of the exhaust line (7), a deflector (11) is arranged in principle in the same direction as the exhaust gas flow . Wherein, the deflector (11) divides the exhaust gas flow flowing through the particle separator (or particle filter) (3) into two paths, that is, the first exhaust gas branch (12) rich in reducing agent and the second exhaust gas branch lacking reducing agent. Two exhaust gas branches (13), and the guide device (11) is preferentially placed in the injection area of the reducing agent (6) (introduced by the dosing device (5)). A hydrolysis catalyst ( 14 ) can preferably be arranged between the metering device ( 5 ) and the particle separator (or particle filter) ( 3 ).

Figure 201020533415

Description

The venting gas appliance of band exhausted gas post-processing system
Technical field
The utility model relates to a kind of venting gas appliance, this venting gas appliance has an exhausted gas post-processing system that is used to reduce nitrogen oxide and concentration of solid particles, have at least one SCR that is used to reduce nitrous oxides concentration (selective catalytic reduction)-catalyst converter, also have the particle separator that is used to reduce solid particle (or particulate filter) that at least one is positioned at SCR-catalyst converter upstream, and be equipped with dosing device at reducing agent in the provided upstream of particle separator.
Background technique
EP 1 892 395 A1 have described a kind of when internal-combustion engine drives with excess air, can reduce the after-treatment system of institute's nitrogen-containing oxide and concentration of solid particles in its waste gas.Wherein, the minimizing of nitrogen oxide and solid particle is achieved by SCR-catalyst converter and particle separator (or particulate filter) respectively.The exhaust flow of internal-combustion engine is provided with an oxidation catalyzer, and this oxidation catalyzer can change part nitrous oxide contained in the exhaust flow into nitrogen dioxide at least.In the exhaust flow in oxidation catalyzer downstream, be mounted with first order particle separator (or particulate filter).By means of the contained nitrogen dioxide of exhaust flow, the particle of accumulation can be converted into carbon monoxide, carbon dioxide, nitrogen and nitrous oxide in first order particle separator (or particulate filter).In the upstream of first order particle separator (or particulate filter), part waste gas is drawn forms the waste gas tributary, and is provided with the dosing device at reducing agent in the waste gas tributary, and second level particle separator (or particulate filter).
EP 1 892 394 A1 have described a kind of exhausted gas post-processing system of the SCR-of having catalyst converter, and this SCR-catalyst converter is positioned in the NH of exhaust flow 3-oxidation catalyzer upstream and particle separator (or particulate filter) downstream.And be equipped with hydrolysis catalyst and at the dosing device of reducing agent in the provided upstream of particulate filter.
Known a kind of internal-combustion engine from WO 00,/34 630 A1 with low pressure egr system.Wherein, draw at the filtration position of exhaust gas reclrculation pipe route gas exhaust piping.Here, filtration has the core area of a band particulate filter and the annulus of a tape-transport mechanism, and core area and annulus formation flow path separately.The exhaust gas recirculation pipeline is drawn from the filtration in core area downstream.Also can known similar setting type from WO 08/059172 A2.
The model utility content
Task of the present utility model is, with easy as far as possible method, the reducing agent that is introduced in the venting gas appliance is done meticulous distribution, and makes the waste gas through preliminary filtration not contain reducing agent when participating in recirculation.
Above-mentioned task will realize as follows according to the utility model, promptly draw a branch road at the exhaust gas recirculation pipeline in the downstream of particle separator (or particulate filter), and settle in the dosing device of gas exhaust piping zone one in principle with exhaust flow guide plate in the same way.To the flow through exhaust flow of particle separator (or particulate filter) of guide plate is divided into two-way, is respectively first waste gas branch road that is rich in reducing agent and the second waste gas branch road that lacks reducing agent.Wherein, flow guide device preferentially is placed in the jeting area of reducing agent (being introduced by dosing device).By exhaust flow being divided into the mode in two tributaries, can prevent that relatively large reducing agent from entering into the exhaust gas recirculation pipeline.And its purpose is, realizes the exhaust gas recirculation that no reducing agent participates in.By drawing waste gas, can make waste gas be transported to (internal-combustion engine) air inlet side again through preliminary filtration in particle separator (or particulate filter) downstream.Wherein, diesel oil separator (or diesel fuel filter) can have different coatings on the first waste gas branch road that is rich in reducing agent and the second waste gas branch road that lacks reducing agent, so that every waste gas branch road all can reach best exhaust after-treatment effect.
Reducing agent dosage operation in particle separator (or particulate filter) upstream, can make reducing agent realize good atomizing and meticulous distribution, and be to improve condensation rate, can between dosing device and particle separator (or particulate filter), preferably settle the hydrolysis catalyst of a metal.In this case, particulate filter can have ceramic substrate.But when not containing the hydrolysis catalyst converter, then can preferably adopt metal matrix.
At hydrolysis catalyst position independently, diesel oil separator (or diesel particulate filter) also can have local coating, and preferably is placed in the coated areas at diesel particulate filter inlet position, has hydrolysis function at least.
For preventing that very important reduction dosage from entering into low pressure-exhaust gas recirculation pipeline, thereby cause the loss of reducing agent in the waste-gas cleaning process, can be advantageously on gas exhaust piping a side relative with waste gas branch road (at the exhaust gas recirculation pipeline) settle a dosing device.
Especially, when using hydrolysis catalyst, particle separator also can not have coating.Here, when settle a first order diesel oil oxidation catalyst converter in the dosing device upstream, and one of SCR-catalyst converter arranged downstream by second level diesel oil oxidation catalyst converter constitute be used for the unburned waste gas component carried out the exhaust aftertreatment assembly of oxidation reaction the time, be very favourable.For improving the meticulous distribution of reducing agent, can in the utility model, further set, between diesel particulate filter and SCR-catalyst converter, settle a mixing arrangement.
Description of drawings
Subsequently, will be further elaborated the utility model by accompanying drawing.Appended sketch has:
The venting gas appliance that Fig. 1 the utility model is related; And
The partial enlarged drawing of Fig. 2 venting gas appliance.
Embodiment
In the downstream of exhaust gas turbine 2, venting gas appliance 1 has a particulate filter 3 and a SCR-catalyst converter 4.In the upstream of particulate filter 3, be provided with one and be responsible for reducing agent 6 is sprayed into dosing device 5 in the gas exhaust piping 7.In the downstream of particulate filter 3, from gas exhaust piping 7, told exhaust gas recirculation pipeline 8, wherein waste gas branch road mark drawings attached mark 9, and reference character 10 expression EGR-valves.
Go out the waste gas of recirculation from the downstream separation of particulate filter 3, can make waste gas be flowed to gas handling system again through first filter.By reducing agent being carried out the dosage operation, can make the reducing agent in the exhaust flow reach high fogging degree and meticulous assigned degree in particulate filter 3 upstreams.This can make the initial moment of dosage of reducing agent be shifted to an earlier date, and therefore the SCR-system also can obtain the highest reduction efficiency.
Be the reducing agent loss of avoiding being caused by exhaust gas recirculation pipeline 8 in the purification process, spy dosing device 5 positions of particulate filter 3 upstreams in gas exhaust piping 7 are provided with a flow guide device 11.Flow guide device 11 is divided into the first waste gas branch road 12 that is rich in reducing agent with exhaust flow, and the second waste gas branch road 13 that lacks reducing agent.Wherein, EGR gas draw position 9, be set at particulate filter 3 downstream areas on the second waste gas branch road 13.
Reducing agent 6 (as contains NH 3Reducing agent) jet graphics and part flow arrangement 11 can determine as follows by fluid technique, promptly in diesel particulate filter 3, form first waste gas branch road 12 that is rich in reducing agent and the second waste gas branch road 13 that lacks reducing agent.Wherein, flow guide device should be configured to make the second waste gas branch road can not mix with reducing agent at diesel particulate filter 3 rears.
For realizing the good atomizing of reducing agent 6, can settle a hydrolysis catalyst 14 in the upstream of particulate filter 3.In addition, can a mixing arrangement 17 be set in the downstream of particulate filter 3 and the upstream of SCR-catalyst converter 4.
Upstream at hydrolysis catalyst 14, a first order diesel oil oxidation catalyst converter 15 can be settled, and one can be settled such as the exhaust aftertreatment assembly that is used for the unburned exhaust gas constituents of leaving over is carried out oxidation processes as second level diesel oil oxidation catalyst converter 16 in the downstream of SCR-catalyst converter 4.
Under situation, can use the not diesel particulate filter 3 of the particularly ceramic substrate of band coating with hydrolysis catalyst 14.
Under the situation of not using hydrolysis catalyst 14, can advantageously adopt the not metal matrix diesel particulate filter 3 of band coating, to eliminate the wear effects of reducing agent.In addition, also can use the local coating of diesel particulate filter of band hydrolysis function at the inlet position of diesel particulate filter 3.

Claims (11)

1.排气装置(1)带有一个用于减少氮氧化物和固体颗粒的废气后处理系统，带有至少一个用于减少氮氧化物的SCR-催化器(4)，还带有至少一个安置于SCR-催化器(4)上游用于减少固体颗粒的颗粒分离器或颗粒过滤器(3)，且在颗粒分离器或颗粒过滤器(3)的上游安置有针对还原剂(6)的配量装置(5)，这样的排气装置，其特征在于，在颗粒分离器或颗粒过滤器(3)的下游设置有针对废气再循环管路(8)的支路(9)，而在排气管路(7)的配量装置(5)区域安置有一块原则上与废气流同向的导流板(11)，其中，导流板(11)将流经颗粒分离器或颗粒过滤器(3)的废气流分成两路，即富含还原剂的第一废气支路(12)和缺少还原剂的第二废气支路(13)，且导流装置(11)安置在经配量装置(5)而引入的还原剂(6)的喷射区域。 1. Exhaust system (1) with an exhaust gas aftertreatment system for reducing nitrogen oxides and solid particles, with at least one SCR catalytic converter (4) for reducing nitrogen oxides, and at least one A particle separator or particle filter (3) for reducing solid particles is arranged upstream of the SCR-catalyst (4) and upstream of the particle separator or particle filter (3) is arranged for the reducing agent (6) Dosing device (5), such an exhaust device, is characterized in that a branch (9) for the exhaust gas recirculation line (8) is arranged downstream of the particle separator or particle filter (3), and in In the area of the dosing device (5) of the exhaust gas line (7), a deflector (11) is arranged in principle in the same direction as the exhaust gas flow, wherein the deflector (11) directs the flow through the particle separator or particle filter The exhaust gas flow of the device (3) is divided into two paths, that is, the first exhaust gas branch circuit (12) rich in reducing agent and the second exhaust gas branch circuit (13) lacking reducing agent, and the flow guiding device (11) is arranged on the The injection area of the reducing agent (6) introduced by the metering device (5). 2.按照权利要求1的排气装置(1)，其特征在于，配量装置(5)被安置在排气管路(7)上与针对废气再循环管路(8)的支路(9)相对的一侧。 2. The exhaust system (1) according to claim 1, characterized in that the metering device (5) is arranged on the exhaust gas line (7) in relation to the branch (9) of the exhaust gas recirculation line (8) ) on the opposite side. 3.按照权利要求1或2的排气装置(1)，其特征在于，在配量装置(5)与颗粒分离器或颗粒过滤器(3)之间安置有一个水解催化器(14)。 3. The exhaust system (1) according to claim 1 or 2, characterized in that a hydrolysis catalyst (14) is arranged between the metering device (5) and the particle separator or particle filter (3). 4.按照权利要求3的排气装置(1)，其特征在于，颗粒分离器或颗粒过滤器(3)具有陶瓷基质。 4. The exhaust system (1) according to claim 3, characterized in that the particle separator or particle filter (3) has a ceramic matrix. 5.按照权利要求1或2的排气装置(1)，其特征在于，颗粒分离器或颗粒过滤器(3)具有局部涂层，其中，安置在颗粒分离器或颗粒过滤器(3)入口部位的涂层区至少具有水解功能。 5. The exhaust system (1) according to claim 1 or 2, characterized in that the particle separator or particle filter (3) has a partial coating, wherein the inlet of the particle separator or particle filter (3) is arranged The coating area of the site has at least a hydrolytic function. 6.按照权利要求1或2的排气装置(1)，其特征在于，颗粒分离器或颗粒过滤器(3)具有金属基质。 6. The exhaust system (1) according to claim 1 or 2, characterized in that the particle separator or particle filter (3) has a metal matrix. 7.按照权利要求1或2的排气装置(1)，其特征在于，颗粒分离器或颗粒过滤器(3)在富含还原剂的第一废气支路(12)和缺少还原剂的第二废气支路(13)上具有不同的涂层。 7. The exhaust system (1) according to claim 1 or 2, characterized in that a particle separator or a particle filter (3) is located between the reducing agent-rich first exhaust gas branch (12) and the reducing agent-poor second exhaust gas branch The two exhaust gas branches (13) have different coatings. 8.按照权利要求1或2的排气装置(1)，其特征在于，颗粒分离器或颗粒过滤器(3)上不带涂层。 8. The exhaust system (1) according to claim 1 or 2, characterized in that the particle separator or particle filter (3) is free of coating. 9.按照权利要求1或2的排气装置(1)，其特征在于，在配量装置(5)的上游安置有第一级柴油氧化催化器(15)。  9. The exhaust system (1) according to claim 1 or 2, characterized in that a first-stage diesel oxidation catalytic converter (15) is arranged upstream of the metering device (5). the 10.按照权利要求1或2的排气装置(1)，其特征在于，在SCR-催化器(4)下游，安置有一个优选由第二级柴油氧化催化器(16)构成的用于对未燃烧废气成分进行氧化的废气后处理组件。 10. The exhaust system (1) according to claim 1 or 2, characterized in that downstream of the SCR catalytic converter (4) there is arranged, preferably a second-stage diesel oxidation catalytic converter (16) for the Exhaust gas aftertreatment components that oxidize unburned exhaust gas components. 11.按照权利要求1或2的排气装置(1)，其特征在于，在颗粒分离器或颗粒过滤器(3)与SCR-催化器(4)之间安置有一个混合装置(17)。  11. The exhaust system (1) according to claim 1 or 2, characterized in that a mixing device (17) is arranged between the particle separator or particle filter (3) and the SCR catalytic converter (4). the
CN2010205334152U 2009-06-25 2010-06-25 Exhaust device with waste gas after-treatment system Expired - Fee Related CN202039923U (en)

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AT507633A2 (en) 2010-06-15
DE102010017526A1 (en) 2010-12-30
AT507633B1 (en) 2012-06-15

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