CN103726912B - The flexible integration devices and methods therefor that a kind of diesel engine vent gas purifies - Google Patents
The flexible integration devices and methods therefor that a kind of diesel engine vent gas purifies Download PDFInfo
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- CN103726912B CN103726912B CN201310717742.1A CN201310717742A CN103726912B CN 103726912 B CN103726912 B CN 103726912B CN 201310717742 A CN201310717742 A CN 201310717742A CN 103726912 B CN103726912 B CN 103726912B
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Abstract
The present invention relates to a kind of diesel engine vent gas and purify flexible integration devices and methods therefor. Formed by DOC diesel oxidation catalyst, DPF diesel engine particles trap, SCR selective catalytic reduction device, tail gas valve, control damper, blast pipe and tube connector etc., control damper connects respectively DOC rear end pipe, DPF front tube and SCR front tube, DPF front tube connects DPF diesel engine particles trap, in pipe, be provided with rotatable DPF tail gas valve, SCR front tube connects SCR selective catalytic reduction device, in pipe, be provided with rotatable SCR tail gas valve, SCR selective catalytic reduction device rear end is connected with the rear end of diesel engine particles trap by tube connector. The present invention is according to the difference of diesel load, flexible adjustment off-gas flows after DOC diesel oxidation catalyst passes through the sequencing of DPF diesel engine particles trap and SCR selective catalytic reduction device, at utmost bring into play the advantage of arrangement separately, effectively improve the comprehensive purifying effect of particle and discharged nitrous oxides in diesel exhaust.
Description
Technical field
The invention belongs to diesel engine vent gas post-processing technology field, be specifically related to the DOC+ that a kind of diesel engine vent gas purifiesDPF+SCR(diesel oxidation catalyst+diesel engine particles trap+selective catalytic reduction device) flexible integration device andMethod.
Background technology
Diesel engine, with its good economy and dynamic property, is widely used in communications and transportation, agricultural machinery and engineering machineThe fields such as tool. In the tail gas of diesel engine, mainly comprise carbon monoxide (CO), hydrocarbon (HC), particle (PM) and nitrogen oxide(NOx) noxious pollutant such as, wherein the discharge of particle (PM) and nitrogen oxide (NOx) is higher, has very large to environment and human bodyHarm, therefore various countries' Abgasgesetz is more and more stricter for the emission limit set of diesel engine PM and NOx. Except adopting necessary machineInterior measure improves outside burning, also must take the outer post processing control techniques of machine to the PM in diesel exhaust and NOx, just can haveEffect reduces the noxious emission amount of the two.
In many technical schemes, diesel oxidation catalyst DOC (DieselOxidationCatalyst) reducesOne of main post-processing technology of CO and HC, diesel engine particles trap DPF (DieselParticulateFilter) fallsOne of main post-processing technology measure of low PM discharge, selective catalytic reduction device SCR (SelectiveCatalyticReduction) be one of the main post-processing technology measure of falling low NOx drainage. And to meet the exhaust method of following increasingly stringentRule, as Europe six Abgasgesetzs, only depend on single exhaust aftertreatment technology cannot meet the demands, and need to take different post-processing technologiesIntegrated combination, in diesel engine exhaust system, install DOC, DPF and SCR additional simultaneously.
While using at the same time DOC, DPF and SCR technology, DOC is arranged in to whole combination foremost, its oxidation CO andWhen HC, a part of NO can be oxidized to NO2, improve NO2Ratio, thus SCR reaction rate accelerated.
Waste gas is first by DOC, and the layout of DPF and SCR particular location exists successively problem. In general there are two kindsScheme:
(1) DPF is preposition, and waste gas first passes through SCR again by DPF. For this scheme, waste gas first by DOC be oxidized HC andCO, then by DPF, the particle in waste gas is carried out to trap filter, the waste gas purifying after particle finally enters SCR. Can subtract like thisThe deposition in SCR such as few carbon soot particles, response area and the service behaviour thereof of NOx in guarantee SCR; And waste gas enters DPFShi Wendu is higher, is conducive to dpf regeneration, can effectively improve its passive regeneration performance, reduces the number of times of initiative regeneration, improvesThe economy of complete machine. Shortcoming is when to be waste gas enter SCR again through DPF, and waste gas self-temperature declines to some extent, and this is to needs one constant temperatureDegree just can have the SCR system of good NOx conversion efficiency unfavorable.
(2) SCR is preposition, and waste gas first passes through DPF again by SCR. For this scheme, just contrary with aforementioned schemes.Waste gas is first oxidized HC and CO by DOC, then by SCR to fall low NOx drainage, now enter the EGT of SCRHeight, this is to ensureing that wherein the catalytic conversion efficiency of NOx is very favourable. But being the particle in waste gas, shortcoming has part depositionAt the inwall of SCR, its service behaviour is affected to some extent. Last waste gas enters DPF again, its particle is trapped to purification, nowEGT decreases. If what its regeneration techniques used is that active regeneration techniques is as the technology such as electrical heating or oil spout, to itRegeneration effect impact is little; If but employing is that passive regeneration technology is as catalytic regeneration or additive regeneration, because regeneration needsWant certain delivery temperature, therefore regeneration effect will be affected.
Visible, adopt DOC+DPF+SCR technology can reduce the discharge of the each noxious pollutant of diesel engine simultaneously, but due to rear twoThere is the sequencing problem of system layout in person, has affected its post processing clean-up effect to diesel engine vent gas.
Summary of the invention
The object of the present invention is to provide a kind of diesel engine vent gas of effective reduction noxious pollutant to purify DOC+DPF+SCR(diesel oxidation catalyst+diesel engine particles trap+selective catalytic reduction device) flexible integration devices and methods therefor, canEnter the sequencing of DPF or SCR with real-time, online, flexible change diesel engine vent gas.
The present invention propose diesel engine vent gas purify DOC+DPF+SCR flexible integration device, by Diesel Engine Exhaust Pipe 2,DOC diesel oxidation catalyst 3, DOC rear end pipe 4, control damper 5, DPF tail gas valve 6, SCR tail gas valve 7, DPF front tube 8,SCR front tube 9, DPF diesel engine particles trap 10, SCR selective catalytic reduction device 11 and tube connector 12 form. Wherein,One side of DOC diesel oxidation catalyst 3 connects diesel engine 1 by Diesel Engine Exhaust Pipe 2, and opposite side connects DOC rear end pipe 4 oneEnd, a side of control damper 5 connects DOC rear end pipe 4 other ends, and upside connects DPF front tube 8 one end, and downside connects before SCREnd pipe 9 one end, DPF front tube 8 other ends connect the front end of DPF diesel engine particles trap 10, and SCR front tube 9 other ends connectConnect the front end of SCR selective catalytic reduction device 11, the rear end of DPF diesel engine particles trap 10 is by tube connector 12 and SCRThe rear end of selective catalytic reduction device 11 is connected; In DPF front tube 8, arrange rotatable DPF tail gas valve 6, DPF tail gas valve 6Upside communicates with atmosphere, arranges rotatable SCR tail gas valve 7 in SCR front tube 9, and SCR tail gas valve 7 downsides communicate with atmosphere; GasFlow control valve 5 is provided with two positions, coordinates turning to of DPF tail gas valve 6 and SCR tail gas valve 7 simultaneously, to determine that air-flow entersThe sequencing of DPF front tube 8 and SCR front tube 9.
The using method of the DOC+DPF+SCR flexible integration device that the diesel engine vent gas that the present invention proposes purifies, specifically stepRapid as follows: the waste gas that diesel engine 1 is discharged passes through Diesel Engine Exhaust Pipe 2, DOC diesel oxidation catalyst 3 and DOC rear end pipe successively4 rear arrival control damper 5 places, control damper 5 is provided with two positions, coordinates DPF tail gas valve 6 and SCR tail gas valve 7 simultaneouslyTurn to, to determine that air-flow enters the sequencing of DPF front tube 8 and SCR front tube 9;
(1) when diesel engine is in the time that rate of load condensate is more than or equal to 50% operation, diesel engine particles discharge capacity is higher, delivery temperatureAlso higher; Switch control damper 5, close DPF tail gas valve 6 simultaneously and open SCR tail gas valve 7. Waste gas is introduced into DPF diesel engineGrain catcher 10, with filtration, purification particle, is conducive to the regenerative process of DPF diesel engine particles trap 10, after having reduced simultaneouslyThe continuous particle deposition amount that is deposited on SCR selective catalytic reduction device 11 inside, is conducive to SCR selective catalytic reduction device 11The carrying out of reaction. Then, the waste gas after filtering particle enters SCR selective catalytic reduction device 11 via tube connector 12, due toWhen high load capacity, exhaust initial temperature is higher, enters SCR selective catalytic reduction device via DPF diesel engine particles trap 10 again, in SCR selective catalytic reduction device 11, still there is uniform temperature to be conducive to the catalytic reduction process of NOx at 11 o'clock.
(2) when diesel engine is in the time that rate of load condensate is less than 50% operation, diesel engine particles discharge capacity is lower, and delivery temperature alsoLow. Switch control damper 5, close SCR tail gas valve 7 simultaneously and open DPF tail gas valve 6. Waste gas is introduced into SCR selective catalysisReduction apparatus 11 is to fall low NOx drainage. Because now particulate emissions is low, therefore be deposited on SCR selective catalytic reduction device 11The grain amount of inwall is less, less on its service behaviour impact. Then waste gas enters DPF diesel engine particles via tube connector 12 and catchesStorage 10, carries out trap filter purification to its particle. In addition, which can also realize DPF diesel engine particles trap 10Pulse cleaning, when waste gas is introduced into DPF diesel engine particles trap 10, be deposited on for a long time in left channel, Bu NengliThe particle of removing by chemical regeneration mode, can pass through reverse air-flow, and it is removed.
Beneficial effect of the present invention is:
The present invention is according to the variation of diesel load, and real-time, online, flexible adjustment is through DOC diesel oxidation catalyst 3Rear off-gas flows is by the sequencing of DPF diesel engine particles trap 10 and SCR selective catalytic reduction device 11, maximum journeyDegree is brought into play the advantage of arrangement separately and is avoided the shortcoming of arrangement separately, thereby improves particle and nitrogen in diesel exhaustThe comprehensive purifying effect of emissions of oxides.
Brief description of the drawings
Fig. 1 be in the embodiment of the present invention 1 when the structural diagrams of control damper 5 during in lower position, be equivalent to DPF bavinOil machine grain catcher 10 is preposition.
Fig. 2 be in the embodiment of the present invention 2 when the structural diagrams of control damper 5 during in position above, be equivalent to SCR choosingSelecting property catalytic reduction device 11 is preposition.
When Fig. 3 is diesel engine high load capacity, DPF diesel engine particles trap 10 preposition with SCR selective catalytic reduction deviceIn 11 preposition two kinds of situations, the NO of diesel engineXTransformation efficiency and particulate burning purifying rate figure. (a) be the NO of diesel engineXTransformation efficiency figure,(b) be particulate burning purifying rate figure.
When Fig. 4 is diesel engine underload, DPF diesel engine particles trap 10 preposition with SCR selective catalytic reduction deviceIn 11 preposition two kinds of situations, the NO of diesel engineXTransformation efficiency and particulate burning purifying rate figure. (a) be the NO of diesel engineXTransformation efficiency figure,(b) be particulate burning purifying rate figure.
Number in the figure: 1 is diesel engine, 2 is Diesel Engine Exhaust Pipe, and 3 is DOC diesel oxidation catalyst, and 4 is DOC rear endPipe, 5 is control damper, and 6 is DPF tail gas valve, and 7 is SCR tail gas valve, and 8 is DPF front tube, and 9 is SCR front tube, and 10 is DPFDiesel engine particles trap, 11 is SCR selective catalytic reduction device, 12 is tube connector.
Detailed description of the invention
Further illustrate the present invention below by embodiment.
Embodiment 1: when diesel engine is when high load capacity (rate of load condensate is more than or equal to 50%), adopt DOC+DPF preposition+SCR afterPut.
As shown in Figure 1, described device is by Diesel Engine Exhaust Pipe 2, DOC diesel oxidation catalyst 3, DOC rear end pipe 4, gasFlow control valve 5, DPF tail gas valve 6, SCR tail gas valve 7, DPF front tube 8, SCR front tube 9, DPF diesel engine particles trap 10,SCR selective catalytic reduction device 11 and tube connector 12 form. DOC diesel oxidation catalyst 3 one sides are passed through diesel exhaust gasPipe 2 connects diesel engine 1, and opposite side connects DOC rear end pipe 4 one end, and control damper 5 one sides connect DOC rear end pipe 4 other ends,Upside connects DPF front tube 8 one end, and downside connects SCR front tube 9 one end, and DPF front tube 8 other ends connect DPF diesel engineThe front end of grain trap 10, SCR front tube 9 other ends connect the front end of SCR selective catalytic reduction device 11, DPF diesel engineThe rear end of grain catcher 10 is connected with the rear end of SCR selective catalytic reduction device 11 by tube connector 12; DPF front tube 8The rotatable DPF tail gas of middle layout valve 6, DPF tail gas valve 6 upsides communicate with atmosphere, arrange rotatable SCR in SCR front tube 9Tail gas valve 7, tail gas valve 7 downsides communicate with atmosphere. When diesel engine work is during at higher load condition, control damper 5 is in belowPosition and DPF tail gas valve 6 and SCR tail gas valve 7 be in as Fig. 1 position, the off-gas flows after DOC diesel oxidation catalystFirst enter DPF front tube 8, off-gas flows, via DPF diesel engine particles trap 10, flows into SCR via tube connector 12 subsequentlySelective catalytic reduction device 11, then the SCR front tube 9 of flowing through, finally enter atmosphere.
Taking a discharge capacity as the diesel engine of 7 liters is as example, as shown in Figure 3, when under high load capacity, delivery temperature is 500 DEG C, DPFNO when diesel engine particles trap 10 is prepositionXTransformation efficiency be about 84%, particulate burning purifying efficiency is about 95%. And SCR is selectiveNO when catalytic reduction device 11 is prepositionXTransformation efficiency be only 70%, particulate burning purifying efficiency is about 88%. Show under high load capacity DPFWhen diesel engine particles trap 10 is preposition, the comprehensive purifying effect of NOx and particle is better.
Embodiment 2: when diesel engine is when underload (rate of load condensate is less than 50%), adopt DOC+SCR preposition+DPF afterPut.
Adopt device described in embodiment 1, when diesel engine work is during in low load condition, control damper 5 is in position abovePut and DPF tail gas valve 6 and SCR tail gas valve 7 in as Fig. 2 position, the off-gas flows head after DOC diesel oxidation catalystBe introduced into SCR front tube 9, off-gas flows, via SCR selective catalytic reduction device 11, flows into DPF via tube connector 12 subsequentlyDiesel engine particles trap 10, then the DPF front tube 8 of flowing through, finally enter atmosphere.
Discharge capacity described in employing embodiment 1 is the diesel engine of 7 liters, and as shown in Figure 4, under underload, delivery temperature is 200DEG C time, NO when selecting property of SCR catalytic reduction device 11 is prepositionXTransformation efficiency be about 55%, particulate burning purifying efficiency is about 91%. AndNO when DPF diesel engine particles trap 10 is prepositionXTransformation efficiency be only 30%, particulate burning purifying efficiency is about 90%. Show low negativeWhen lotus, when selecting property of SCR catalytic reduction device 11 is preposition, the comprehensive purifying effect of NOx and particle is better.
Claims (1)
1. a using method for the flexible integration device that diesel engine vent gas purifies, is characterized in that described flexible integration device,By Diesel Engine Exhaust Pipe (2), DOC diesel oxidation catalyst (3), DOC rear end pipe (4), control damper (5), DPF tail gas valve(6), SCR tail gas valve (7), DPF front tube (8), SCR front tube (9), DPF diesel engine particles trap (10), SCR are selectiveCatalytic reduction device (11) and tube connector (12) composition, a side of DOC diesel oxidation catalyst (3) is passed through Diesel Engine Exhaust Pipe(2) connect diesel engine (1), opposite side connects DOC rear end pipe (4) one end, and DOC diesel oxidation catalyst (3) is arranged in flexibilityIntegrating device foremost, can be oxidized to NO by a part of NO2, improve NO2Ratio, thus SCR reaction rate accelerated; Air-flowOne side of control valve (5) connects DOC rear end pipe (4) other end, and upside connects DPF front tube (8) one end, and downside connects before SCREnd pipe (9) one end, DPF front tube (8) other end connects the front end of DPF diesel engine particles trap (10), SCR front tube (9)The other end connects the front end of SCR selective catalytic reduction device (11), and the rear end of DPF diesel engine particles trap (10) is by connectingTaking over (12) is connected with the rear end of SCR selective catalytic reduction device (11); In DPF front tube (8), arrange rotatable DPF tailAir valve (6), DPF tail gas valve (6) upside communicates with atmosphere, arranges rotatable SCR tail gas valve (7), SCR in SCR front tube (9)Tail gas valve (7) downside communicates with atmosphere; Control damper (5) is provided with two positions, coordinates DPF tail gas valve (6) and SCR simultaneouslyTurning to of tail gas valve (7), to determine that air-flow enters the sequencing of DPF front tube (8) and SCR front tube (9);
Concrete steps when it uses are as follows: the waste gas that diesel engine (1) is discharged passes through blast pipe (2), DOC oxidative diesel successivelyAfter catalyst converter (3) and DOC rear end pipe (4), arrive control damper (5) and locate, control damper (5) is provided with two positions, simultaneouslyCoordinate turning to of DPF tail gas valve (6) and SCR tail gas valve (7), to determine that air-flow enters DPF front tube (8) and SCR front tube (9)Sequencing, DOC diesel oxidation catalyst (3) is arranged in flexible integration device foremost, can be by a part of NO oxygenChange into NO2, improve NO2Ratio, thus SCR reaction rate accelerated; In the time that DPF tail gas valve (6) is placed in upright position, waste gas passes throughAfter DOC diesel oxidation catalyst, directly enter atmosphere; When SCR tail gas valve (7) is placed in upright position, waste gas is by DOC bavinAfter oil machine oxidation catalyzer, directly enter atmosphere;
(1) when diesel engine is in the time that rate of load condensate is more than or equal to 50% operation, diesel engine particles discharge capacity is higher, and delivery temperature alsoHigh; Switch control damper (5), close DPF tail gas valve (6) simultaneously and open SCR tail gas valve (7); Waste gas is introduced into DPF diesel oilMachine grain catcher (10), with filtration, purification particle, is conducive to the regenerative process of DPF diesel engine particles trap (10), subtracts simultaneouslyLack the particle deposition amount of subsequent deposition at SCR selective catalytic reduction device (11), be conducive to SCR SCR dressPut the carrying out of (11) reaction; Then, the waste gas after filtering particle enters SCR selective catalytic reduction device via tube connector (12)(11), during due to high load capacity, exhaust initial temperature is higher, enters SCR selective via DPF diesel engine particles trap (10) againWhen catalytic reduction device (11), in SCR selective catalytic reduction device (11), still there is uniform temperature to be conducive to the catalysis of NOxReduction process;
(2) when diesel engine is in the time that rate of load condensate is less than 50% operation, diesel engine particles discharge capacity is lower, and delivery temperature is also lower;Switch control damper (5), close SCR tail gas valve (7) simultaneously and open DPF tail gas valve (6); It is selective that waste gas is introduced into SCRCatalytic reduction device (11) is to fall low NOx drainage; Because now particulate emissions is low, therefore be deposited on SCR SCRThe grain amount of device (11) inwall is less, less on its service behaviour impact; Then waste gas enters DPF bavin via tube connector (12)Oil machine grain catcher (10), carries out trap filter purification to its particle; Waste gas enters DPF diesel engine via tube connector (12)Grain trap (10), can realize the pulse cleaning of DPF diesel engine particles trap (10), and waste gas is introduced into DPF diesel engineWhen grain trap (10), be deposited on for a long time particle in left channel, that can not utilize chemical regeneration mode to remove, can pass throughReverse air-flow, removes it.
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| CN104614185A (en) * | 2014-12-11 | 2015-05-13 | 中国北方发动机研究所(天津) | Engine emission test rack |
| US10473020B2 (en) * | 2016-07-25 | 2019-11-12 | Ford Global Technologies, Llc | Method and system for exhaust aftertreatment |
| CN111135716B (en) * | 2019-12-28 | 2022-04-08 | 一汽解放汽车有限公司 | Exhaust pollutant monitoring and purifying device |
| CN113417717A (en) * | 2021-07-16 | 2021-09-21 | 山西新华防化装备研究院有限公司 | Tail gas purification integrated device for heavy diesel engine test station |
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| CN201588675U (en) * | 2009-12-24 | 2010-09-22 | 同济大学 | Diesel particulate filter and selective catalytic reduction compound system for tail gas clean-up of diesel engine |
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| JP2013189900A (en) * | 2012-03-13 | 2013-09-26 | Isuzu Motors Ltd | Exhaust gas purification device |
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| US7134273B2 (en) * | 2002-09-04 | 2006-11-14 | Ford Global Technologies, Llc | Exhaust emission control and diagnostics |
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| CN101302955A (en) * | 2007-05-10 | 2008-11-12 | 迪尔公司 | Particulate filter regeneration system for an internal combustion engine |
| CN201588675U (en) * | 2009-12-24 | 2010-09-22 | 同济大学 | Diesel particulate filter and selective catalytic reduction compound system for tail gas clean-up of diesel engine |
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