CN104963750A - Static mixing device for SCR system of high-power diesel engine - Google Patents
Static mixing device for SCR system of high-power diesel engine Download PDFInfo
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- CN104963750A CN104963750A CN201510394693.1A CN201510394693A CN104963750A CN 104963750 A CN104963750 A CN 104963750A CN 201510394693 A CN201510394693 A CN 201510394693A CN 104963750 A CN104963750 A CN 104963750A
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Abstract
The invention discloses a static mixing device for an SCR system of a high-power diesel engine and belongs to the technical field of diesel engine tail gas denitration. The static mixing device for the SCR system of the high-power diesel engine is characterized in that the two ends of the mixing device are connected with flanges, and the mixing device can be directly connected with an SCR gas inlet pipeline and is convenient to install and wash; meanwhile, a criss-cross latticed base is omitted, the mixing device is divided into four base plates arranged in four layers, each base plate is provided with four lines of fins, and a certain angle is formed between each fin and the corresponding base plate. When tail gas and urea spray liquid drops discharged by the diesel engine flow through the fins of the mixing device, a strong eddy and strong turbulent flow can be generated; the static mixing device is good in mixing effect, simple in structure, economical, practical and easy to install and wash and causes slight pressure loss.
Description
Technical field
The invention belongs to high-power diesel engine exhaust after treatment system field, more particularly relate to a kind of static mixing device for high-power diesel engine SCR system.
Background technique
Selective catalytic reduction (SCR) reduces the mainstream technology of NOx as large diesel engine, refers under the effect of catalyzer, promotes to react with NOx the process forming N2 by suppressing the non-selective burning of reducing agent.Most popular is at present used urea SCR system, used urea SCR system is as reducing agent using urea, by spraying into a certain amount of aqueous solution of urea in exhaust duct, aqueous solution of urea obtains reducing agent NH3 by evaporation, pyrolysis and hydrolytic process, NH3 reacts with the NOx in diesel engine vent gas as reducing agent and generates N2 under the effect of catalyzer, reduces the NOx content in tail gas with this.
Current most widely used used urea SCR system mainly contains two classes: air is assisted SCR system and assisted SCR system without air.Air assists SCR system aqueous solution of urea jet atomization better effects if under compressed-air actuated booster action, thus aqueous solution of urea drop and exhaust mix evenly, the efficiency of SCR system is also higher, but the structure of system can be more complicated, and system cost is higher.Structure without air assisted injection system is simple, but atomizing effect is poor, and make the mixed effect of aqueous solution of urea drop and exhaust poor, SCR system efficiency is lower.
Before carrier, the uniformity of NH3 distribution has important impact to conversion rate of NOx and carrier lifetime, and NH3 skewness can cause regional area NH3 too much to cause NH3 to leak, and then causes NOx conversion efficiency too low in NH3 thinning area; Long NH3 skewness can cause the uneven of catalyst ageing degree thus affect the life-span of catalyzer and the performance of SCR system.
The uneven distribution of urea droplets can cause that local temperature is too low, urea concentration is too high, easily forms crystallization in metal surface, can block outlet pipe, cause engine power performance to decline time serious.
In order to improve the transformation efficiency of NOx and avoid NH3 to leak, must make aqueous solution of urea drop and exhaust mix evenly, mixed effect is better, and research shows that mixer can make aqueous solution of urea drop and exhaust mixed effect better, improves the mixing uniformity of exhaust and urea spray droplet.
At present, what have in urea-spray after-treatment system of engine does not have mixing arrangement, mixing of aqueous solution of urea drop and exhaust cannot be realized, cause the non-uniformity problem of urea in SCR reactor to be given prominence to, thus greatly have impact on the denitration efficiency of motor exhaust.Have the mixer that uses of motor can make urea spray droplet easily at mixer surface deposition, and can increase the pressure loss of SCR system, the pressure loss is excessive, can reduce the Economy of motor.
Therefore, need a kind of new technological scheme to solve the problem.
Summary of the invention
The present invention is to solve the above-mentioned defect that prior art exists, its objective is: for the non-uniformity problem without mixer in diesel urea spray after-treatment system, some mixers surface easily produces the pressure loss problems of too of sediments and SCR system, provides the little static mixing device for high-power diesel engine SCR system of the pressure loss of a kind of good mixing effect, generation.
For solving above-mentioned technical problem, the technological scheme that the static mixing device that the present invention is used for high-power diesel engine SCR system adopts is:
For a static mixing device for high-power diesel engine SCR system, comprise mixer body; The substrate of some layers of horizontal expansion is provided with from top to bottom in described mixer body; Every laminar substrate is provided with some large fins and the little fin of some rows; Described little fin tilts from substrate and extends forward; Described large fin tilts from substrate and extends back; And at least one large fin from substrate upwards and tilt backwards extension, at least one large fin from substrate downwards and tilt backwards extension.
Compared with background technique, the effect that the present invention has is: by being provided with multilager base plate, every laminar substrate there are more little fin and the large fin of correspondence, when urea spray droplet and diesel engine vent gas flow through little fin and large fin, stronger eddy current and turbulent flow can be produced, make the good mixing effect of urea spray droplet and diesel engine vent gas.
Further, the present invention can also provide a kind of outlet pipe comprising above-mentioned static mixing device, comprise exhaust pipe, connect the SCR reactor of exhaust pipe, described static mixing device is arranged in exhaust pipe, is also provided with the urea nozzle extended in exhaust pipe in exhaust pipe; Described urea nozzle between exhaust pipe entrance and static mixing device and surface of nozzle spray to static mixing device; Described little fin tilts from substrate and extends to body inlet side; Described large fin tilts from substrate and extends to SCR reactor side; And at least one large fin from substrate upwards and extend to SCR reactor lopsidedness, at least one large fin from substrate downwards and extend to SCR reactor lopsidedness.
Compared with background technique, the effect that the present invention has is: described urea nozzle between exhaust pipe entrance and static mixing device and surface of nozzle spray to static mixing device; Described little fin tilts from substrate and extends to body inlet side, when urea spray droplet and diesel engine vent gas flow through little fin and large fin, can produce stronger eddy current and turbulent flow, make the good mixing effect of urea spray droplet and diesel engine vent gas.
Accompanying drawing explanation
Fig. 1 is the SCR system structural representation with mixing arrangement,
Fig. 2 is the plan view of static mixing device of the present invention,
Fig. 3 is the side view that in static mixing device of the present invention, substrate and large and small fin are arranged,
Fig. 4 is the stereogram of static mixing device of the present invention,
Fig. 5 is the stereogram of another angle of static mixing device of the present invention,
Fig. 6 is the speed vector figure of simulating without the CFD of urea solution jet during mixing arrangement,
Fig. 7 is the speed vector figure of the CFD simulation of urea-spray when being equipped with this static mixing device.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
As shown in Figures 1 to 5, the present invention discloses a kind of static mixing device 4 for high-power diesel engine SCR system, openly comprises the outlet pipe 10 as this static mixing device simultaneously.
Wherein, refer to shown in Fig. 2 to Fig. 5, static mixing device comprises mixer body 2; The substrate 8 of some layers of horizontal expansion is provided with from top to bottom in described mixer body 2.Every laminar substrate 8 is provided with some large fins 10 and the little fin 9 of some rows.Described little fin 9 tilts from substrate and extends forward; Described large fin 10 tilts from substrate 8 and extends back.And at least one large fin 10 from substrate 8 upwards and tilt backwards extension, at least one large fin 10 from substrate 8 downwards and tilt backwards extension.The effect that wherein large fin 10 and little fin 9 can reach is, when fluid flows through first little fin 9, due to obstruction and the flow-disturbing effect of little fin, fluid is divided into two strands, flows through, when flowing through second little fin 9 respectively from the both sides up and down of little fin 9, fluid is divided into two strands again, by that analogy, thus be conducive to fluid (when for high-power diesel engine SCR system, fluid is mixing of urea and tail gas); Divided again and again converge when mixed fluid flows through large fin 10, converge face owing to upgrading continually, add the effective area of contact between gas-liquid, make tail gas more abundant with mixing of urea spray solution particle swarm.
And preferred a kind of mode of execution is: substrate 8 is set to four layers, every laminar substrate 8 is embedded on the inwall of mixer body 2 by welding.Described every laminar substrate 8 all has the little fin of four row 9 and with the large fin 10 often arranging little fin 9 same column, describedly often arrange little fin and include three little fins 9.When fluid flows through first little fin 9, due to obstruction and the flow-disturbing effect of little fin, fluid is divided into two strands, flow through from the both sides up and down of little fin 9 respectively, when flowing through second little fin 9, fluid is divided into two strands again, and because fluid will flow through the 3rd little fin 9, therefore the divided number of plies is 2
3, namely can meet the requirement of gas-liquid mixed.From substrate 8 upwards and tilt backwards extension, from substrate 8 downwards and tilt backwards extension, that converges when enabling mixed fluid flow through large fin 10 is more even for two the large fins 10 being positioned at outside for two the large fins 10 described every laminar substrate 8 being positioned at inner side.And described large fin 10 extends from described substrate 8 rear edge bending, convenient manufacture.
Please again shown in composition graphs 1, the outlet pipe 10 comprising static mixing device 4 comprises exhaust pipe 11, connects the SCR reactor 5 of exhaust pipe 11.Described static mixing device 4 is arranged in exhaust pipe 11, is also provided with the urea nozzle 3 extended in exhaust pipe 11 in exhaust pipe 11.Described urea nozzle 3 between exhaust pipe entrance 1 and static mixing device 4 and nozzle 3 spray towards static mixing device 4; Described little fin 9 tilts from substrate 8 and extends to body entrance 1 side; Described large fin 10 tilts from substrate 8 and extends to SCR reactor 5 side.And at least one large fin 10 is (in present embodiment, be two) from substrate upwards and extend to SCR reactor lopsidedness, at least one large fin 10 (in present embodiment, being similarly two) from substrate 8 downwards and extend to SCR reactor 5 lopsidedness.Described mixer body 2 two ends are connected with exhaust pipe 11 respectively by adpting flange 6,7.
And preferred a kind of mode of execution is: described substrate 8 is divided into four layers, the spacing between every laminar substrate 8 is 1/5 exhaust pipe internal diameter.The length of little fin 9 and the ratio of exhaust pipe internal diameter are 1:9 ~ 1:7, and the tilt angle between substrate 8 is 18 ° ~ 30 °.The length of large fin 10 and the ratio of exhaust pipe internal diameter are 1:7 ~ 1:4, and the tilt angle between substrate 8 is 30 ° ~ 45 °.
Whether obtain obvious lifting in order to illustrate with gas-liquid mixed effect after mixing arrangement, the CFD that the two schemes not being equipped with mixing arrangement to urea liquid and being equipped with mixing arrangement has carried out gas-liquid two-phase flow analyzes.Fig. 6 is the velocity distribution without urea solution jet during mixing arrangement, and Fig. 7 is the velocity distribution of urea solution jet when being equipped with this static mixing device.Comparison diagram 7 and Fig. 6 can find out; when being equipped with static mixing device; when urea liquid flows through the little fin of static mixing device and large fin; under the guide functions of little fin and large fin, urea liquid particle can rotate, and has certain eddy flow degree; its flow direction and speed can change; be split into multiply simultaneously, thus can be more abundant with the blending of tail gas, create better condition for entering SCR system further.
In addition, also can be reached a conclusion by the speed cloud atlas (not shown) of CFD software simulation without mixing arrangement and when being furnished with this static mixing device on reactor inlet cross section, during without mixing arrangement, the speed of reactor inlet section edges near wall place is very little, velocity variations on cross section is violent, and uniformity is very poor; When being equipped with this static mixing device, the velocity variations on reactor inlet cross section is little, and the velocity uniformity on whole cross section is significantly improved.
In addition, be respectively CFD software simulation without mixing arrangement and be furnished with this static mixing device time reactor inlet cross section on the concentration profile (not shown) of urea liquid particle also can reach a conclusion, during without mixing arrangement, the urea liquid sprayed into is more concentrated, mainly concentrate on reactor center axis, after being equipped with this static mixing device, the urea liquid sprayed into compares dispersion, urea liquid and tail gas mix evenly.
After the urea precipitation thing on substrate 8 and little, large fin reaches some, the adpting flange 6,7 of mixing arrangement can be pulled down from inlet body 11, sediments on cleaning base plate and fin, after cleaning, mixing arrangement is arranged on inlet body 11 by recycling adpting flange 6,7.
Claims (10)
1. for a static mixing device for high-power diesel engine SCR system, it is characterized in that, comprise mixer body (2), in described mixer body, be provided with the substrate (8) of some layers of horizontal expansion from top to bottom; Every laminar substrate is provided with some large fins (10) and the little fin of some rows (9); Described little fin tilts from substrate and extends forward; Described large fin tilts from substrate and extends back; And at least one large fin from substrate upwards and tilt backwards extension, at least one large fin from substrate downwards and tilt backwards extension.
2. as described in claim 1 for the static mixing device of high-power diesel engine SCR system, it is characterized in that: described substrate (8) is four layers, described every laminar substrate all has the little fin of four row (9) and with the large fin (10) often arranging little fin same column, describedly often arrange little fin and include three little fins.
3. as described in claim 2 for the static mixing device of high-power diesel engine SCR system, it is characterized in that: from substrate upwards and tilt backwards extension, two the large fins being positioned at outside from substrate downwards and tilt backwards extension for two the large fins (10) described every laminar substrate (8) being positioned at inner side.
4. as described in claim 3 for the static mixing device of high-power diesel engine SCR system, it is characterized in that: described large fin (10) is extended from the bending of described substrate (8) rear edge.
5. as described in claim 1 for the static mixing device of high-power diesel engine SCR system, it is characterized in that: every laminar substrate (8) is embedded on the inwall of mixer body (2) by welding.
6. comprise the outlet pipe of the static mixing device according to any one of claim 15, it is characterized in that: comprise exhaust pipe (11), connect the SCR reactor (5) of exhaust pipe, described static mixing device is arranged in exhaust pipe, is also provided with the urea nozzle (3) extended in exhaust pipe in exhaust pipe; Described urea nozzle is positioned between exhaust pipe entrance (1) and static mixing device (4) and surface of nozzle is sprayed to static mixing device; Described little fin (9) is tilted from substrate and is extended to body inlet side; Described large fin (10) is tilted from substrate and is extended to SCR reactor side; And at least one large fin from substrate upwards and extend to SCR reactor lopsidedness, at least one large fin from substrate downwards and extend to SCR reactor lopsidedness.
7. outlet pipe as claimed in claim 6, is characterized in that: described body (2) two ends are connected with exhaust duct respectively by adpting flange (6,7).
8. outlet pipe as claimed in claim 6, it is characterized in that: described substrate (8) is divided into four layers, spacing between every laminar substrate is 1/5 exhaust pipe (11) internal diameter, and every laminar substrate is embedded on the inwall of mixer body (2) by welding.
9. outlet pipe as claimed in claim 6, is characterized in that: the length of little fin (9) and the ratio of exhaust pipe (11) internal diameter are 1:9 ~ 1:7, and the tilt angle between substrate (2) is 18 ° ~ 30 °.
10. outlet pipe as claimed in claim 6, is characterized in that: the large length of fin (10) and the ratio of exhaust pipe (11) are 1:7 ~ 1:4, and the tilt angle between substrate (2) is 30 ° ~ 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510394693.1A CN104963750A (en) | 2015-07-07 | 2015-07-07 | Static mixing device for SCR system of high-power diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510394693.1A CN104963750A (en) | 2015-07-07 | 2015-07-07 | Static mixing device for SCR system of high-power diesel engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257377A (en) * | 2015-10-30 | 2016-01-20 | 安徽全柴动力股份有限公司 | SCR after-treatment packaging structure for diesel engine |
| CN105464763A (en) * | 2015-11-19 | 2016-04-06 | 浙江大学 | Urea powerful mixing device for SCR system of small and medium-sized ship |
| CN108119211A (en) * | 2017-12-23 | 2018-06-05 | 无锡威孚力达催化净化器有限责任公司 | A kind of close-coupled mixing arrangement for meeting six discharge standard of Europe |
| CN108533376A (en) * | 2018-03-01 | 2018-09-14 | 无锡威孚力达催化净化器有限责任公司 | Silencer gas disturbing flow device |
| CN110541746A (en) * | 2019-09-24 | 2019-12-06 | 河南科技大学 | Diesel engine SCR system and urea spraying and mixing device |
| CN111577431A (en) * | 2020-05-11 | 2020-08-25 | 江苏科技大学 | Marine SCR system mixer |
| CN111569653A (en) * | 2020-05-09 | 2020-08-25 | 江苏科技大学 | Urea supply module based on marine exhaust denitration system |
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| DE19731926C1 (en) * | 1997-07-24 | 1999-01-21 | Siemens Ag | Emission control system for a diesel engine |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257377A (en) * | 2015-10-30 | 2016-01-20 | 安徽全柴动力股份有限公司 | SCR after-treatment packaging structure for diesel engine |
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| CN105464763A (en) * | 2015-11-19 | 2016-04-06 | 浙江大学 | Urea powerful mixing device for SCR system of small and medium-sized ship |
| CN105464763B (en) * | 2015-11-19 | 2018-01-26 | 浙江大学 | A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system |
| CN108119211A (en) * | 2017-12-23 | 2018-06-05 | 无锡威孚力达催化净化器有限责任公司 | A kind of close-coupled mixing arrangement for meeting six discharge standard of Europe |
| CN108533376A (en) * | 2018-03-01 | 2018-09-14 | 无锡威孚力达催化净化器有限责任公司 | Silencer gas disturbing flow device |
| CN110541746A (en) * | 2019-09-24 | 2019-12-06 | 河南科技大学 | Diesel engine SCR system and urea spraying and mixing device |
| CN110541746B (en) * | 2019-09-24 | 2021-03-19 | 河南科技大学 | Diesel engine SCR system and urea spraying and mixing device |
| CN111569653A (en) * | 2020-05-09 | 2020-08-25 | 江苏科技大学 | Urea supply module based on marine exhaust denitration system |
| CN111577431A (en) * | 2020-05-11 | 2020-08-25 | 江苏科技大学 | Marine SCR system mixer |
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Application publication date: 20151007 |