CN103726912A - Flexible integrated equipment and method thereof for diesel tail gas purification - Google Patents
Flexible integrated equipment and method thereof for diesel tail gas purification Download PDFInfo
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- CN103726912A CN103726912A CN201310717742.1A CN201310717742A CN103726912A CN 103726912 A CN103726912 A CN 103726912A CN 201310717742 A CN201310717742 A CN 201310717742A CN 103726912 A CN103726912 A CN 103726912A
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Abstract
The invention relates to flexible integrated equipment and method thereof for diesel tail gas purification. The device comprises a DOC (diesel oxidation catalyst), a DPF (diesel particulate filter), a SCR (selective catalytic reduction) device, tail gas valves, an airflow control valve, an exhaust pipe, a connection pipe and the like. The airflow control valve is respectively connected with a DOC rear-end pipe, a DPF front-end pipe and a SCR front-end pipe. A rotatable DPF tail gas valve is arranged in the DPF front-end pipe which is connected with the DPF, a rotatable SCR tail gas valve is arranged in the SCR front-end pipe which is connected with the SCR, and the rear end of the SCR device is connected with the rear end of the DPF through the connection pipe. According to different diesel loads, sequence of waste gas flow passing through the DPF and the SCR device is flexibly adjusted after the waste gas flow passes through the DOC, advantages of each arrangement plans can be taken to the maximum extent, and accordingly comprehensive purification effects of particulates and nitrogen oxides in diesel waste gas can be effectively improved.
Description
Technical field
The invention belongs to diesel engine vent gas post-processing technology field, be specifically related to DOC+DPF+SCR(diesel oxidation catalyst+diesel engine particles catcher+selective catalytic reduction device that a kind of diesel engine vent gas purifies) flexible integration devices and methods therefor.
Background technique
Diesel engine, with its good Economy and power character, is widely used in the fields such as communications and transportation, farm machinery and engineering machinery.In the tail gas of diesel engine, mainly comprise the noxious pollutants such as carbon monoxide (CO), hydrocarbon (HC), particle (PM) and nitrogen oxide (NOx), wherein particle (PM) and nitrogen oxide (NO
x) discharge higher, environment and human body are had to very large harm, so various countries' Abgasgesetz is for diesel engine PM and NO
xemission limit set more and more stricter.In adopting necessary machine, measure improves burning, also must be to the PM in diesel exhaust and NO
xtake the outer reprocessing control techniques of machine, could effectively reduce the noxious emission amount of the two.
In many technological schemes, diesel oxidation catalyst DOC (Diesel Oxidation Catalyst) is one of main post-processing technology reducing CO and HC, diesel engine particles catcher DPF (Diesel Particulate Filter) is one of main post-processing technology measure reducing PM discharge, and selective catalytic reduction device SCR (Selective Catalytic Reduction) reduces NO
xone of main post-processing technology measure of discharge.And the Abgasgesetz that will meet following increasingly stringent is as Europe six Abgasgesetzs, only depend on single exhaust aftertreatment technology cannot meet the demands, need to take the integrated combination of different post-processing technologies, 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, in its oxidation CO and HC, a part of NO can be oxidized to NO
2, improve NO
2ratio, thus SCR reactive rate accelerated.
Waste gas is first by DOC, and the layout of DPF and SCR particular location exists successively problem.In general there is two schemes:
(1) DPF is preposition, and waste gas first passes through SCR again by DPF.For this scheme, waste gas is first oxidized HC and CO by DOC, then by DPF, the particle in waste gas is carried out to trap filter, and the waste gas purifying after particle finally enters SCR.Can reduce like this deposition in SCR such as carbon soot particles, guarantee NO in SCR
xresponse area and service behaviour thereof; And temperature is higher when waste gas enters DPF, be conducive to dpf regeneration, can effectively improve its passive regeneration performance, reduce the number of times of initiative regeneration, improve the 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 just can have good NO to needs uniform temperature
xthe SCR system of conversion efficiency is 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 reduce NO
xdischarge, the exhaust gas temperature that now enters SCR is higher, and this is to guaranteeing wherein NO
xcatalytic conversion efficiency be very favourable.But shortcoming is the particle in waste gas, have the inwall that part is deposited on SCR, its service behaviour is affected to some extent.Last waste gas enters DPF again, and its particle is trapped to purification, and now exhaust gas temperature decreases.If what its regeneration techniques was used is that active regeneration techniques is as technology such as electric heating or oil spouts, on its regeneration effect impact not quite; If but adopt be passive regeneration technology as catalytic regeneration or additive regeneration, because regeneration needs certain delivery temperature, so regeneration effect will be affected.
Visible, adopt DOC+DPF+SCR technology can reduce the discharge of each noxious pollutant of diesel engine simultaneously, but due to rear both there is the sequencing problem of system layout, affected its reprocessing purifying 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 catcher+selective catalytic reduction device) flexible integration devices and methods therefor, change diesel engine vent gas that can be real-time, online, flexible enters the sequencing of DPF or SCR.
The DOC+DPF+SCR flexible integration device that the diesel engine vent gas that the present invention proposes purifies, is comprised of 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 catcher 10, SCR selective catalytic reduction device 11 and connecting tube 12.Wherein, one side of DOC diesel oxidation catalyst 3 connects diesel engine 1 by Diesel Engine Exhaust Pipe 2, opposite side connects DOC rear end pipe 4 one end, one side of control damper 5 connects DOC rear end pipe 4 the other ends, upside connects DPF front tube 8 one end, downside connects SCR front tube 9 one end, DPF front tube 8 the other ends connect the front end of DPF diesel engine particles catcher 10, SCR front tube 9 the other ends connect the front end of SCR selective catalytic reduction device 11, the rear end of DPF diesel engine particles catcher 10 is connected with the rear end of SCR selective catalytic reduction device 11 by connecting tube 12, in DPF front tube 8, arrange rotatable DPF tail gas valve 6, DPF tail gas valve 6 upsides communicate with atmosphere, arrange rotatable SCR tail gas valve 7 in SCR front tube 9, and SCR tail gas valve 7 downsides communicate with atmosphere, control damper 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 enters the 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, concrete steps are as follows: the waste gas that diesel engine 1 is discharged arrives control damper 5 places successively after Diesel Engine Exhaust Pipe 2, DOC diesel oxidation catalyst 3 and DOC rear end pipe 4, control damper 5 is provided with two positions, coordinate turning to of DPF tail gas valve 6 and SCR tail gas valve 7, to determine that air-flow enters the sequencing of DPF front tube 8 and SCR front tube 9 simultaneously;
(1) when diesel engine is when Rate of load condensate is more than or equal to 50% operation, diesel engine particles discharge amount is higher, and delivery temperature is also 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 engine particles catcher 10 with filtration, purification particle, the regenerative process that is conducive to DPF diesel engine particles catcher 10, reduce the particle deposition amount of subsequent deposition in SCR selective catalytic reduction device 11 inside simultaneously, be conducive to the carrying out of SCR selective catalytic reduction device 11 reactions.Then, waste gas after filtering particle enters SCR selective catalytic reduction device 11 via connecting tube 12, during due to high load, exhaust initial temperature is higher, while entering again SCR selective catalytic reduction device 11 via DPF diesel engine particles catcher 10, in SCR selective catalytic reduction device 11, still there is uniform temperature to be conducive to NO
xcatalytic reduction process.
(2) when diesel engine is when Rate of load condensate is less than 50% operation, diesel engine particles discharge amount 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.Waste gas is introduced into SCR selective catalytic reduction device 11 to reduce NO
xdischarge.Because now particulate emissions is low, therefore it is less to be deposited on the grain amount of SCR selective catalytic reduction device 11 inwalls, less on its service behaviour impact.Then waste gas enters DPF diesel engine particles catcher 10 via connecting tube 12, and its particle is carried out to trap filter purification.In addition, which can also realize the pulse cleaning of DPF diesel engine particles catcher 10, when waste gas is introduced into DPF diesel engine particles catcher 10, is deposited on for a long time particle in left channel, that can not utilize chemical regeneration mode to remove, can pass through reverse air-flow, it is removed.
Beneficial effect of the present invention is:
The present invention is according to the variation of diesel load, in real time, online, flexible adjustment off-gas flows after DOC diesel oxidation catalyst 3 passes through the sequencing of DPF diesel engine particles catcher 10 and SCR selective catalytic reduction device 11, at utmost bring into play the advantage of arrangement separately and avoid the shortcoming of arrangement separately, thereby improving the comprehensive purifying effect of particle and discharged nitrous oxides in diesel exhaust.
Accompanying drawing explanation
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 diesel engine particles catcher 10 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 selective catalytic reduction device 11 preposition.
When Fig. 3 is diesel engine high load, DPF diesel engine particles catcher 10 preposition with the preposition two kinds of situations of SCR selective catalytic reduction device 11 under, the NO of diesel engine
x transformation efficiency and particulate burning purifying rate figure.(a) be the NO of diesel engine
x transformation efficiency figure, (b) is particulate burning purifying rate figure.
When Fig. 4 is diesel engine low-load, DPF diesel engine particles catcher 10 preposition with the preposition two kinds of situations of SCR selective catalytic reduction device 11 under, the NO of diesel engine
x transformation efficiency and particulate burning purifying rate figure.(a) be the NO of diesel engine
x transformation efficiency figure, (b) is 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 end pipe, 5 is control damper, 6 is DPF tail gas valve, and 7 is SCR tail gas valve, and 8 is DPF front tube, 9 is SCR front tube, 10 is DPF diesel engine particles catcher, and 11 is SCR selective catalytic reduction device, and 12 is connecting tube.
Embodiment
Below by embodiment, further illustrate the present invention.
embodiment 1: when diesel engine is in high load(Rate of load condensate is more than or equal to 50%)
time, adopt DOC+DPF preposition+SCR is rearmounted.
As shown in Figure 1, described device is comprised of 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 catcher 10, SCR selective catalytic reduction device 11 and connecting tube 12.DOC diesel oxidation catalyst 3 one sides connect diesel engine 1 by Diesel Engine Exhaust Pipe 2, opposite side connects DOC rear end pipe 4 one end, control damper 5 one sides connect DOC rear end pipe 4 the other ends, upside connects DPF front tube 8 one end, downside connects SCR front tube 9 one end, DPF front tube 8 the other ends connect the front end of DPF diesel engine particles catcher 10, SCR front tube 9 the other ends connect the front end of SCR selective catalytic reduction device 11, and the rear end of DPF diesel engine particles catcher 10 is connected with the rear end of SCR selective catalytic reduction device 11 by connecting tube 12; In DPF front tube 8, arrange rotatable DPF tail gas valve 6, DPF tail gas valve 6 upsides communicate with atmosphere, arrange rotatable SCR tail gas valve 7 in SCR front tube 9, and tail gas valve 7 downsides communicate with atmosphere.When diesel engine work is during at higher load condition, control damper 5 in lower position and DPF tail gas valve 6 and SCR tail gas valve 7 in as Fig. 1 position, first off-gas flows after DOC diesel oxidation catalyst enters DPF front tube 8, off-gas flows is via DPF diesel engine particles catcher 10 subsequently, via connecting tube 12, flow into SCR selective catalytic reduction device 11, the SCR front tube 9 of flowing through again, finally enters atmosphere.
The diesel engine that the discharge capacity of take is 7 liters is example, as shown in Figure 3, when under high load, delivery temperature is 500 ℃, NO when DPF diesel engine particles catcher 10 is preposition
x transformation efficiency be about 84%, particulate burning purifying efficiency is about 95%.And SCR selective catalytic reduction device 11 NO when preposition
x transformation efficiency be only 70%, particulate burning purifying efficiency is about 88%.Show under high load, when DPF diesel engine particles catcher 10 is preposition, the comprehensive purifying effect of NOx and particle is better.
embodiment 2: when diesel engine is in low-load(Rate of load condensate is less than 50%)
time, adopt DOC+ SCR preposition+DPF is rearmounted.
Device described in employing embodiment 1, when diesel engine work is during in low load condition, control damper 5 in position above and DPF tail gas valve 6 and SCR tail gas valve 7 in as Fig. 2 position, first off-gas flows after DOC diesel oxidation catalyst enters SCR front tube 9, off-gas flows is via SCR selective catalytic reduction device 11 subsequently, via connecting tube 12, flow into DPF diesel engine particles catcher 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, as shown in Figure 4, when under low-load, delivery temperature is 200 ℃, NO when selecting property of SCR catalytic reduction device 11 is preposition
x transformation efficiency be about 55%, particulate burning purifying efficiency is about 91%.And DPF diesel engine particles catcher 10 NO when preposition
x transformation efficiency be only 30%, particulate burning purifying efficiency is about 90%.While showing low-load, when selecting property of SCR catalytic reduction device 11 is preposition, the comprehensive purifying effect of NOx and particle is better.
Claims (2)
1. the flexible integration device that a diesel engine vent gas purifies, 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 catcher (10), SCR selective catalytic reduction device (11) and connecting tube (12) form, it is characterized in that: a side of DOC diesel oxidation catalyst (3) connects diesel engine (1) by Diesel Engine Exhaust Pipe (2), opposite side connects DOC rear end pipe (4) one end, one side of control damper (5) connects DOC rear end pipe (4) the other end, upside connects DPF front tube (8) one end, downside connects SCR front tube (9) one end, DPF front tube (8) the other end connects the front end of DPF diesel engine particles catcher (10), SCR front tube (9) the other end connects the front end of SCR selective catalytic reduction device (11), the rear end of DPF diesel engine particles catcher (10) is connected with the rear end of SCR selective catalytic reduction device (11) by connecting tube (12), in DPF front tube (8), arrange rotatable DPF tail gas valve (6), DPF tail gas valve (6) upside communicates with atmosphere, in SCR front tube (9), arrange rotatable SCR tail gas valve (7), SCR tail gas valve (7) downside communicates with atmosphere, control damper (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 enters the sequencing of DPF front tube (8) and SCR front tube (9).
2. the using method of the flexible integration device that a diesel engine vent gas as claimed in claim 1 purifies, it is characterized in that concrete steps are as follows: the waste gas that diesel engine (1) is discharged arrives successively control damper (5) and locates after outlet pipe (2), DOC diesel oxidation catalyst (3) and DOC rear end pipe (4), control damper (5) is provided with two positions, coordinate turning to of DPF tail gas valve (6) and SCR tail gas valve (7), to determine that air-flow enters the sequencing of DPF front tube (8) and SCR front tube (9) simultaneously;
(1) when diesel engine is when Rate of load condensate is more than or equal to 50% operation, diesel engine particles discharge amount is higher, and delivery temperature is also 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 engine particles catcher (10) with filtration, purification particle, the regenerative process that is conducive to DPF diesel engine particles catcher (10), reduce the particle deposition amount of subsequent deposition at SCR selective catalytic reduction device (11) simultaneously, be conducive to the carrying out of SCR selective catalytic reduction device (11) reaction; Then, waste gas after filtering particle enters SCR selective catalytic reduction device (11) via connecting tube (12), during due to high load, exhaust initial temperature is higher, while entering again SCR selective catalytic reduction device (11) via DPF diesel engine particles catcher (10), in SCR selective catalytic reduction device (11), still there is uniform temperature to be conducive to NO
xcatalytic reduction process; ;
(2) when diesel engine is when Rate of load condensate is less than 50% operation, diesel engine particles discharge amount 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); Waste gas is introduced into SCR selective catalytic reduction device (11) to reduce NO
xdischarge; Because now particulate emissions is low, therefore it is less to be deposited on the grain amount of SCR selective catalytic reduction device (11) inwall, less on its service behaviour impact; Then waste gas enters DPF diesel engine particles catcher (10) via connecting tube (12), and its particle is carried out to trap filter purification; Which also can realize the pulse cleaning of DPF diesel engine particles catcher (10), be that waste gas is while being introduced into DPF diesel engine particles catcher (10), be deposited on for a long time particle in left channel, that can not utilize chemical regeneration mode to remove, can pass through reverse air-flow, it is removed.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN107654278A (en) * | 2016-07-25 | 2018-02-02 | 福特环球技术公司 | Method and system for exhaust aftertreatment |
| CN111135716A (en) * | 2019-12-28 | 2020-05-12 | 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 |
| CN114961957A (en) * | 2021-02-22 | 2022-08-30 | 佛山市晴宇环保科技有限公司 | Novel power discharge system device of diesel vehicle |
| CN114961957B (en) * | 2021-02-22 | 2024-06-07 | 佛山市晴宇环保科技有限公司 | Novel power discharge system device of diesel vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| CN114961957B (en) * | 2021-02-22 | 2024-06-07 | 佛山市晴宇环保科技有限公司 | Novel power discharge system device of diesel vehicle |
| 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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