CN104564252A - After-treatment device for diesel vehicle emission - Google Patents
After-treatment device for diesel vehicle emission Download PDFInfo
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- CN104564252A CN104564252A CN201510017712.9A CN201510017712A CN104564252A CN 104564252 A CN104564252 A CN 104564252A CN 201510017712 A CN201510017712 A CN 201510017712A CN 104564252 A CN104564252 A CN 104564252A
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- sleeve
- hush tube
- diesel vehicle
- treatment device
- carrier
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an after-treatment device for diesel vehicle emission. The after-treatment device for diesel vehicle emission comprises a sleeve and an inlet air pipe, an inner end cover is arranged in the sleeve, a purifying device and a muffler device are arranged in the sleeve in an integrated mode, the purifying device comprises a carrier catalyzing device and a particulate matter trap, the muffler device comprises a hush tube and a silencer inner end cover, the hush tube is connected with a barrel body through the silencer inner end cover and a clapboard, the end of the hush tube is the air outlet hush tube, the air outlet hush tube extends outside the sleeve to connect to the air outlet end flange, the carrier catalyzing device is DIC carrier catalyzing device taking the honeycomb ceramic as the carrier, the particulate matter trap is PF/CPF semi-permeable type particulate matter trap, a foil corrugated insulation tube or a stainless steel double layer heat insulation pipe is sleeved outside the inlet air pipe. According to the practical market and environment protection requirement, the after-treatment device for diesel vehicle emission has the advantages of simple structure, reasonable design, convenient installation and low composite cost. The emission pollution problem of the diesel vehicle under the condition of idle speed or low load, frequent starting operation and the emission standard reaches the nation four-grade or five -grade standard.
Description
Technical field
The invention belongs to exhaust gas from diesel vehicle processing technology field, be specifically related to a kind of exhaust gas from diesel vehicle after-treatment device.
Background technique
Along with improving constantly of environmental requirement, state motor vehicle pollutant emission standard is also stricter, it is as shown in table 1 that emission limit is tested in the WHTC cold start-up of fourth stage and five-stage and thermal starting, and the exhaust emissions under ESC and ETC of state IV and state V tests requires as shown in table 2.
Table 1 WHTC cold start-up and thermal starting test emission limit
Table 2 ESC and ETC tests emission request
State four emission standard is national fourth stage motor vehicle emission standard, the egr system+DOC mainly adopted for exhaust gas from diesel vehicle process or egr system+DOC+POC technology path.DOC and oxidation catalyst, mainly for the treatment of the SOF particle in HC, CO, PM, normally open combustion temperature more than 320 degree; POC is penetrating type grain catcher, be mainly used in catching the SOOT particle in PM, and at a certain temperature, continuous passive regeneration is carried out to it, due to its structure and regeneration mechanism, under low speed or idling, its PM efficiency is at about 40%-50%, even lower, therefore cannot guarantee the emission compliance under this operating mode.
After state four emission standard was formally implemented on July 1st, 2014, in specific implementation process, all kinds of problem constantly exposes, wherein main in idling, frequent starting situation, the tail gas of discharging in motor can not reach the reaction temperature required for DOC carrier after gas exhaust manifold, POC carrier also cannot regenerate, cause vehicle exhaust harmful components part or no reaction completely, cause and occur that discharge exceeds standard and over-emitting black exhaust phenomenon in idling, frequent starting situation.
Summary of the invention
For problems of the prior art, the object of the invention is to design provides a kind of exhaust gas from diesel vehicle after-treatment device, i.e. DOC+PF/CPF.Namely PF is not with catalyzer half penetrating type grain catcher, is mainly used in catching the SOOT particle in PM, and carries out continuous passive regeneration to it at a certain temperature, and PM efficiency is at 50%-70%; The half penetrating type grain catcher of CPF namely with catalyzer, is mainly used in catching the SOOT particle in PM, and efficiency, can passive regeneration continuously at 50%-80%.
Described a kind of exhaust gas from diesel vehicle after-treatment device, comprise sleeve, suction tude, suction tude is connected with sleeve by flange, inner end cap is provided with in sleeve, it is characterized in that in described sleeve, integral type is provided with purification plant and silencer, described purification plant comprises carrier catalysis device, grain catcher, described silencer comprises hush tube, be arranged on the noise reduction inner end cap of hush tube inlet end, described hush tube is connected with cylindrical shell by noise reduction inner end cap and dividing plate, the end of hush tube is hush tube or the steam outlet pipe of giving vent to anger, described give vent to anger hush tube or steam outlet pipe stretch out that sleeve is outer to be connected with outlet side flange, described carrier catalysis device is DOC carrier catalysis device, take ceramic honey comb as carrier, interior painting contains active component Pt or Pt/Pd, aluminium oxide, the coating of molecular sieve and auxiliary agent, described grain catcher is PF/CPF half penetrating type grain catcher, in described suction tude, socket is provided with thermal insulation pipe.
Described a kind of exhaust gas from diesel vehicle after-treatment device, is characterized in that described grain catcher inlet end duct standard-sized sheet, and standard-sized sheet one hole, hole, adjacent two ducts one, outlet side is closed.
Described a kind of exhaust gas from diesel vehicle after-treatment device, is characterized in that interval 15 ~ 25mm between described carrier catalysis device and grain catcher, and and is equipped with inflated insert between sleeve lining.
Described a kind of exhaust gas from diesel vehicle after-treatment device, is characterized in that described steam outlet pipe is the double-deck heat-insulated pipe of tinfoil paper insulating pipe with corrugation insulating layer or stainless steel.
Described a kind of exhaust gas from diesel vehicle after-treatment device, is characterized in that described tin thermal insulation pipe adopts button-shaped coated connection, or adopts the structural type of stainless steel double thermal insulation pipe.
Described a kind of exhaust gas from diesel vehicle after-treatment device, is characterized in that described suction tude, give vent to anger hush tube or steam outlet pipe is provided with differential pressure pickup joint.
Existing DPF filter is wall-flow filter, in adjacent two passages, selects any one end blocking in two ends, thus forces waste gas by porous wall, realize the trapping to particulate matter.DPF will consider the soot that can bear certain load factor when designing.If the amount of soot of piling up exceedes it and urges heavy load ability, the particulate matter of DPF inside can produce air-flow and hinder, thus Pressure Drop is increased, finally cause DPF to block completely, therefore DPF system must provide reliable regeneration strategy to guarantee that the problems referred to above can not occur.DPF can reach more than 90% to the filter efficiency of particulate matter, but dpf regeneration and control strategy more complicated, and demarcate the construction cycle long, development cost are high, and the company having the ability to carry out DPF system development is at present less.
The filter layer of POC adopts wire netting to form usually, and its filtration channel is flow through structure, and becomes crimp shape.This structure makes waste gas in flow process or the passage along fold moves ahead, or needs through filter layer.Filter layer is namely for arrested particles.The regeneration of POC normally completes under normal riving condition, when the exhaust of motor reaches uniform temperature, and the NO in waste gas
2can react with carbon soot particles and realize passive regeneration.But when engine low-idle, low-load or frequent starting, delivery temperature does not reach passive regeneration temperature requirement, can produce and blow ash and POC ablation phenomenon.
As compared to DPF with POC, PF is due to the special construction of carrier, and carbon black and ash content are collected in closed runner, and the carbon black collected only can be burnt, and can not blow out, and avoids " blowing ash " phenomenon that POC in use produces.Simultaneously because the passage of PF filter about 50% is flow type, during bypass flow channel guarantee carbon black loaded, pressure change is mild, even if carbon black is collected runner and is blocked completely, the pressure loss only can increase by 50%, and be unlikely the situation that appearance blocks completely, as long as enter passive regeneration Process window, carbon black can be burnt completely, thus realizes the continuous passive regeneration process of PF.
The present invention is based on actual market and ecological requirements, there is the competitive advantages such as structure is simple, reasonable in design, easy for installation, overall cost is low.The emission pollution problem of diesel-oil vehicle under idling or low-load, frequent starting can be solved, reach state four, state five emission standard.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention (DOC+PF+ noise elimination structure);
Fig. 2 is the axial sectional structure schematic diagram of Fig. 1;
Fig. 3 is the structural representation (DOC+PF) of the present invention without noise elimination structure;
Fig. 4 is the axial sectional structure schematic diagram of Fig. 3;
Fig. 5 is carrier catalysis device inlet end structural representation;
Fig. 6 is grain catcher outlet side structural representation;
In figure: 1-thermal insulation pipe, 2-flange, 3-suction tude, 4-sleeve, 5-differential pressure pickup joint, 6-outlet side flange, 7-inner end cap, 8-inflated insert, 9-carrier catalysis device, 10-grain catcher, 11-noise reduction inner end cap, 12-hush tube, 13-dividing plate, 14-gives vent to anger hush tube, 15-steam outlet pipe.
Embodiment
The present invention is further illustrated below in conjunction with Figure of description.
As shown in figures 1 to 6, a kind of exhaust gas from diesel vehicle after-treatment device of the present invention, comprise sleeve 4, suction tude 3, suction tude 3 is connected with sleeve 4 by flange 2, inner end cap 7 is provided with in sleeve 4, in sleeve 4, integral type is provided with purification plant and silencer, and purification plant comprises carrier catalysis device 9, grain catcher 10, carrier catalysis device 9 and be equipped with inflated insert 8 between grain catcher 10 and sleeve 4; Silencer comprises hush tube 12, is arranged on the noise reduction inner end cap 11 of hush tube inlet end, hush tube 12 is connected with sleeve 4 by noise reduction inner end cap 11 and dividing plate 13, the end of hush tube 12 is hush tube 14 or the steam outlet pipe of giving vent to anger, and give vent to anger hush tube 14 or steam outlet pipe 15 stretch out the outer and outlet side flange 6 of sleeve 4, and suction tude 3, give vent to anger hush tube 14 or steam outlet pipe 15 are provided with differential pressure pickup joint 5; The built-in silencer of sleeve 4 greatly reduces packaging cost and installing space, and it is spinning structure that the present invention simultaneously changes traditional end cover structure, uses Large Diameter Rotary compression technology, packaging cost is significantly reduced in manufacturing process.Carrier catalysis device 9 is DOC carrier catalysis device, and take ceramic honey comb as carrier, interior painting contains the coating of active component Pt or Pt/Pd, aluminium oxide, molecular sieve and auxiliary agent, and a part of NO is oxidized to NO by oxidable CO and HC simultaneously
2, after reaching uniform temperature in grain catcher 10, NO
2react with carbon granule, the carbon granule be trapped in grain catcher 10 is burnt, make grain catcher 10 carry out passive regeneration.Grain catcher is PF/CPF half penetrating type grain catcher, be specially grain catcher 10 inlet end duct standard-sized sheet, standard-sized sheet one hole, hole, adjacent two ducts one, outlet side is closed, and exhaust airstream is through PF, carbon soot particles is trapped within blind bore road, outlet side, reaches the effect of filtration of particulate matters.In suction tude 3, socket is provided with the tinfoil paper insulating pipe with corrugation insulating layer 1 of button-shaped coated connection.
Before use EGR+DOC+PF (CPF) technology path, first must claim to the former row of motor, the former row's index of PM must not higher than 0.076g/kwh, DOC carrier catalysis device technology should possess abundant catalytic oxidation HC CO SOF (60% of total PM) ability completely, and PF/CPF half penetrating type grain catcher should higher than 50% to SOOT granule capturing power of regeneration.Tinfoil paper insulating pipe with corrugation insulating layer 1 connecting engine and after-treatment device, adopt button-shaped bag to tie up, it is convenient to dismantle, and can adjust arbitrarily according to different length, and stainless steel double thermal insulation pipe has thermal insulation property splendid, the effect of long service life.Through lot of experiments checking, adopt the structural type of the insulation of tinfoil paper bellows or employing stainless steel double thermal insulation pipe, an average mitron channel temp loss is only about 10 degree, is conducive to exhaust insulation.Meanwhile, this device is different from metal POC packaged type, metal POC encapsulation directly contact with cylindrical shell, between do not have liner to carry out insulation heat accumulation, and be unfavorable for regeneration after safety.This kind of device has taken into full account this risk, when designing from heat accumulation, insulation, safety and cost consideration, interval 15 ~ 25mm between grain catcher 10 and carrier catalysis device 9, while preventing that friction occurs between carrier, the problem of plugging particle catcher can also be solved, the too high problem of back pressure can also be reduced after solving blockage problem, the carrier catalysis device 9 of 4 li, sleeve is with the indent between grain catcher, for spinning is made, this is to prevent carrier from can come in contact in long-term operation, grain catcher 10 and inflated insert 8 is set between carrier catalysis device 9 and sleeve lining replaces non-intumescent mat, after packaging, pretreatment is carried out to inflated insert 8, it is made to guarantee necessarily to encapsulate power, reach heat accumulation ground, insulation, heat insulation and safe effect, the cost of this kind of liner is only 1/10th of non-intumescent mat simultaneously.
Comprehensively above-mentioned measure, make vehicle under idling formula operating mode or speed operation or frequent starting, can at about 30 seconds, waste gas is made to enter suction tude 3 when reaching inner end cap 7 of sleeve 4, its temperature reaches more than 320 °, wherein, inner end cap 7 adopts double layer construction, favourable insulation, different motor, due to power, the difference of rotating speed, may slightly difference, make HC in waste gas CO SOF and DOC carrier catalysis device generation chemical reaction, discharge a large amount of heats simultaneously, the temperature short time is made to rise to more than 400 degree, be conducive to the needs that rear class PF carries out granules regeneration effectively.When the temperature that the transmission of prime DOC carrier catalysis device comes cannot reach initiation temperature, part coated precious metal CPF can be carried out to PF, then be conducive to secondary response exotherm by the Partial Oxidation reaction on CPF grain catcher, delivery temperature is once jumped intensification again, pass through verification experimental verification, under same structure, the CPF grain catcher comparable not band coating PF grain catcher of band coating promoted 30 to 70 degree, advantageously in the granules regeneration of PF in 5 seconds.Regeneration efficiency can reach more than 50% under idling or running on the lower load.According to the transformation efficiency of state five PM limit value 0.02g/kwh and DOC to SOF, the accounting of SOF and SOOT, only otherwise super 0.076g/kwh, the practicable state four of the program upgrades the requirement of state five motor former row PM value.
Differential pressure pickup joint 5 cooperation vehicle OBD have use, when exhaust back pressure is greater than a threshold value, (car load vent systems back pressure loss must not higher than 2%, or reprocessing assembly back pressure must not higher than 25Kpa), as higher than limiting design value, then OBD system is reported to the police, Engine ECU is implemented limit and is turned round, and notifies that driver and conductor overhauls reprocessing.This device, in purification silencing structure, carries out entirety and considers, by DOC the back pressure loss of PF consider in the lump together with noise elimination structure, greatly reduce packaging cost and installing space, as shown in Figure 1.Simultaneously on manufacturing process, realize Large Diameter Rotary compression technology, diameter is less than to the product of 160mm, all can adopt cylindrical shell spinning process.Change traditional end cap technique, adopt spinning structure, only packaging cost can decline 1/5th.For discharge capacity 3.0L motor, within this device manufacturing price can be controlled in 1500 yuan/cover, relative to DOC+POC structure, cost can decline 15%.
As arranged demand according to car load chassis, single employing DOC+PF integral type packaging technology, then comparatively the structure of this kind of purification silencing one is more simple, and overall cost can be lower, as shown in Figure 4.
Structure of the present invention is through finite element analysis, and its carrier flow uniformity coefficient is greater than 0.9, and carrier eccentricity is less than 0.6, and lambda sensor place flow velocity is greater than 100m/s, and overall presure drop is less than 25KPa.
Claims (6)
1. an exhaust gas from diesel vehicle after-treatment device, comprise sleeve (4), suction tude (3), suction tude is connected with sleeve by flange (2), inner end cap (7) is provided with in sleeve, it is characterized in that described sleeve (4) interior integral type is provided with purification plant and silencer, described purification plant comprises carrier catalysis device (9), grain catcher (10), described silencer comprises hush tube (12), be arranged on the noise reduction inner end cap (11) of hush tube (12) inlet end, described hush tube (12) is connected with cylindrical shell by noise reduction inner end cap (11) and dividing plate (13), the end of hush tube is hush tube of giving vent to anger (14) or steam outlet pipe, described hush tube of giving vent to anger (14) or steam outlet pipe (15) stretch out sleeve (4) and are connected with outlet side flange (6) outward, described carrier catalysis device (9) is DOC carrier catalysis device, take ceramic honey comb as carrier, interior painting contains active component Pt or Pt/Pd, aluminium oxide, the coating of molecular sieve and auxiliary agent, described grain catcher (10) is PF/CPF half penetrating type grain catcher, the upper socket of described suction tude (3) is provided with thermal insulation pipe (1).
2. a kind of exhaust gas from diesel vehicle after-treatment device according to claim 1, is characterized in that described grain catcher (10) inlet end duct standard-sized sheet, and standard-sized sheet one hole, hole, adjacent two ducts one, outlet side is closed.
3. a kind of exhaust gas from diesel vehicle after-treatment device according to claim 1, is characterized in that interval 15 ~ 25mm between described carrier catalysis device (9) and grain catcher (10), and and is equipped with inflated insert (8) between sleeve (4) inwall.
4. a kind of exhaust gas from diesel vehicle after-treatment device according to claim 1, is characterized in that described steam outlet pipe (1) is for tinfoil paper insulating pipe with corrugation insulating layer or the double-deck heat-insulated pipe of stainless steel.
5. a kind of exhaust gas from diesel vehicle after-treatment device according to claim 1, is characterized in that described tin thermal insulation pipe (1) adopts button-shaped coated connection, or adopts the structural type of stainless steel double thermal insulation pipe.
6. a kind of exhaust gas from diesel vehicle after-treatment device according to claim 1, is characterized in that described suction tude (3), hush tube of giving vent to anger (14) or steam outlet pipe (15) are provided with differential pressure pickup joint (5).
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105736097A (en) * | 2016-04-08 | 2016-07-06 | 重庆交通大学 | Diesel engine tail gas recovering and purifying and noise reducing composite device |
| CN105781689A (en) * | 2016-04-08 | 2016-07-20 | 重庆交通大学 | Diesel engine tail gas composite noise reduction device |
| CN105888782A (en) * | 2016-04-08 | 2016-08-24 | 重庆交通大学 | Compound purifying device for diesel engine tail gas |
| US9976460B2 (en) | 2016-03-24 | 2018-05-22 | Caterpillar Inc. | Exhaust after-treatment assembly for engine system |
| CN109595058A (en) * | 2017-09-30 | 2019-04-09 | 镇江润德节能科技有限公司 | A kind of tail gas discharging pipe with tail gas treating function |
| CN109826699A (en) * | 2019-02-28 | 2019-05-31 | 武汉理工大学 | A kind of exhaust system applied to electrothermic type hybrid vehicle |
| CN112879141A (en) * | 2021-02-26 | 2021-06-01 | 徐州徐工矿业机械有限公司 | Post-processing device for reducing smoke intensity of high-power engine of non-road mobile machinery |
| CN113447189A (en) * | 2021-06-18 | 2021-09-28 | 中自环保科技股份有限公司 | Automobile exhaust aftertreatment catalytic unit backpressure testing device and testing method |
| CN114065560A (en) * | 2020-07-29 | 2022-02-18 | 浙江交通职业技术学院 | Particle catcher blockage detection device and method |
| CN114517726A (en) * | 2022-02-17 | 2022-05-20 | 金华职业技术学院 | Motor vehicle tail gas catalytic purifier |
| CN114758641A (en) * | 2022-04-13 | 2022-07-15 | 大连理工大学 | Sound absorption device combined by various honeycomb embedded honeycomb sandwich members |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9976460B2 (en) | 2016-03-24 | 2018-05-22 | Caterpillar Inc. | Exhaust after-treatment assembly for engine system |
| CN105736097A (en) * | 2016-04-08 | 2016-07-06 | 重庆交通大学 | Diesel engine tail gas recovering and purifying and noise reducing composite device |
| CN105781689A (en) * | 2016-04-08 | 2016-07-20 | 重庆交通大学 | Diesel engine tail gas composite noise reduction device |
| CN105888782A (en) * | 2016-04-08 | 2016-08-24 | 重庆交通大学 | Compound purifying device for diesel engine tail gas |
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| CN109595058A (en) * | 2017-09-30 | 2019-04-09 | 镇江润德节能科技有限公司 | A kind of tail gas discharging pipe with tail gas treating function |
| CN109826699A (en) * | 2019-02-28 | 2019-05-31 | 武汉理工大学 | A kind of exhaust system applied to electrothermic type hybrid vehicle |
| CN114065560A (en) * | 2020-07-29 | 2022-02-18 | 浙江交通职业技术学院 | Particle catcher blockage detection device and method |
| CN114065560B (en) * | 2020-07-29 | 2024-06-11 | 浙江交通职业技术学院 | Device and method for detecting blockage of particle catcher |
| CN112879141A (en) * | 2021-02-26 | 2021-06-01 | 徐州徐工矿业机械有限公司 | Post-processing device for reducing smoke intensity of high-power engine of non-road mobile machinery |
| CN112879141B (en) * | 2021-02-26 | 2021-12-17 | 徐州徐工矿业机械有限公司 | Post-processing device for reducing smoke intensity of high-power engine of non-road mobile machinery |
| CN113447189A (en) * | 2021-06-18 | 2021-09-28 | 中自环保科技股份有限公司 | Automobile exhaust aftertreatment catalytic unit backpressure testing device and testing method |
| CN114517726A (en) * | 2022-02-17 | 2022-05-20 | 金华职业技术学院 | Motor vehicle tail gas catalytic purifier |
| CN114517726B (en) * | 2022-02-17 | 2023-03-31 | 金华职业技术学院 | Motor vehicle tail gas catalytic purifier |
| CN114758641A (en) * | 2022-04-13 | 2022-07-15 | 大连理工大学 | Sound absorption device combined by various honeycomb embedded honeycomb sandwich members |
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|---|---|
| CN104564252B (en) | 2017-12-15 |
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