CN104847463A - Nozzle integrated SCR post treatment unit and method thereof - Google Patents
Nozzle integrated SCR post treatment unit and method thereof Download PDFInfo
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- CN104847463A CN104847463A CN201510247166.8A CN201510247166A CN104847463A CN 104847463 A CN104847463 A CN 104847463A CN 201510247166 A CN201510247166 A CN 201510247166A CN 104847463 A CN104847463 A CN 104847463A
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Abstract
The invention discloses a nozzle integrated SCR post treatment unit and a method thereof. The nozzle integrated SCR post treatment unit comprises an intake-tube, a nozzle, a front outer end cover, a front inner end cover, a front inner shell, insulated cotton, a front outer shell, a front baffle, a small pipe, a rear baffle, a small hole plate, a carrier, a packaging liner, a packaging shell, a rear hole plate, a rear shell, noise reduction cotton, a rear end cover and an air outlet pipe, wherein a catalyst carrier is arranged in the cavity of the carrier, and catalyst is coated on the catalyst carrier. According to the post treatment unit, the nozzle is arranged on a converter in an integration mode and arranged at the front part of the small pipe, the small pipe is arranged between the front baffle and the rear baffle, a small hole plate with multiple holes is formed at the bottom of the small pipe, the opening of the front baffle can avoid formation of the urea crystallization. According to the nozzle integrated SCR post treatment unit, the nozzle is arranged on a converter in an integration mode, the structure is compact, reactant distribution homogeneity in the carrier can be obviously improved, and catalytic conversion efficiency of the tail gas is effectively improved.
Description
Technical field
The present invention relates to automobile exhaust system field, is nozzle integrated form SCR after-treatment device in particular
and method.
Background technique
At present, SCR aftertreatment system is more and more extensive in the utilization in large diesel engine reprocessing field.In general, existing catalyzed conversion silencing apparatus all requires, under the prerequisite meeting exhaust back pressure and not loss effective engine power, to reduce NOx emission as much as possible.Therefore present automobile exhaust system all requires that aqueous solution of urea fully can be atomized pyrolysis before arrival catalyst carrier, and fully mixes with tail gas, and then in SCR catalyst, carrier surface fully reacts, and reaches the object reducing NOx discharge.
In traditional arrangement mode, on the pipeline of arrangement of nozzles before converter, have certain spatial requirement with converter, this makes in arrangement, needs the factors such as the integral arrangement of many consideration front ends pipeline, length and insulation.And in nozzle integrated form after-treatment device, nozzle is integrated on SCR converter, overall space characteristics of compact layout is also simple a lot.
Summary of the invention
What the present invention will solve is exactly the problems referred to above that prior art exists, aim to provide nozzle integrated form SCR after-treatment device and method thereof, not only nozzle is integrated on converter, the uniformity of reactant distribution in carrier can also be significantly improved, thus effectively improve the catalytic conversion efficiency of NOx in tail gas.
In order to solve the problem, the technological scheme that this patent adopts is:
Nozzle integrated form SCR after-treatment device comprises suction tude, nozzle, front outer end cap, front inner end cap, front inner housing, heat-preservation cotton, front casing body, front screen, tubule, backboard, aperture plate, carrier, encapsulation liner, packing casing, rear orifice plate, rear case, silencing cotton, rear end cover and steam outlet pipe.Described carrier is coated with catalyzer.
In the middle of front inner end cap and front outer end cap, and be all designed with heat-preservation cotton in the middle of front inner housing and front casing body.Airstream compartment before carrier, adopts double-layer heat insulation design, avoids gas flow temperature to decline, cause the decline of catalytic conversion efficiency, occur urea crystals phenomenon under also avoiding worst cold case.
The injection central point of nozzle in the front portion of tubule, tubule airintake direction projection circle in.Suction tude and tubule, in the direction of the air flow, stagger in cross section.Tail gas enters into SCR inside by suction tude, and after front screen bounce-back, produce flow-disturbing, the urea liquid driving nozzle to spray into enters in tubule together, and most air-flow arrives the end face of carrier by the perforate on tubule and the hole on backboard.Tubule bottom design has porous slab, and uniform pore diameter is arranged.Partial tail gas air-flow directly arrives carrier end face by aperture plate.
On front screen, have 7 apertures, fraction directly can enter into the cavity between baffle plate and tubule in these 7 apertures, avoids this cavity and occurs flow dead, effectively prevent the generation of urea crystals phenomenon.
Backboard has 4 macropores, and leave certain distance with carrier end face, to ensure the flow uniformity that tail gas is good and suitable system back pressure.
Nozzle integrated form SCR after-treatment device of the present invention is not only integrated in nozzle on converter, and compact structure, can also significantly improve the uniformity of reactant distribution in carrier, thus effectively raises the catalytic conversion efficiency of tail gas.
Accompanying drawing explanation
Fig. 1 is nozzle integrated form SCR after-treatment device schematic diagram.
Be labeled as in figure: suction tude 1, nozzle 2, front outer end cap 3, front inner end cap 4, front inner housing 5, heat-preservation cotton 6, front casing body 7, front screen 8, tubule 9, backboard 10, aperture plate 11, carrier 12, encapsulation liner 13, packing casing 14, rear orifice plate 15, rear case 16, silencing cotton 17, rear end cover 18 and steam outlet pipe 19.
Fig. 2 is front screen schematic diagram;
Fig. 3 is backboard schematic diagram.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, to the embodiment of this patent, such as: further detailed description is made in the effect and working principle etc. of the mutual alignment relation between the shape of structure, structure and each several part and annexation, each several part:
The present invention is nozzle integrated form SCR after-treatment device, nozzle is integrated to be arranged on converter, cavity configuration before appropriate design, the air-flow entering catalyst converter inside is made to obtain good distributing homogeneity, effectively prevent the solids particles precipitate blocking catalyst carrier channel in urea crystals and tail gas simultaneously, thus realize higher catalytic conversion efficiency.
As described in Figure 1, nozzle integrated form SCR after-treatment device of the present invention, comprises suction tude (1), nozzle (2), front outer end cap (3), front inner end cap (4), front inner housing (5), heat-preservation cotton (6), front casing body (7), front screen (8), tubule (9), backboard (10), aperture plate (11), carrier (12), encapsulation liner (13), packing casing (14), rear orifice plate (15), rear case (16), silencing cotton (17), rear end cover (18) and steam outlet pipe (19)
As described in Figure 1, in the middle of front inner end cap (4) and front outer end cap (3), and front inner housing (5) and front casing body (7) centre are all designed with heat-preservation cotton (6).Airstream compartment before carrier, adopts double-layer heat insulation design, avoids gas flow temperature to decline, cause the decline of catalytic conversion efficiency, also can avoid the crystallization of low temperature urea.
As described in Figure 1, the injection central point of nozzle (2) in the front portion of tubule (9), and projection on, in the circle of tubule (9).Suction tude (1) and tubule (9), in the direction of the air flow, stagger in cross section.Off-gas flows reaches SCR inside by suction tude (1), and on the baffle plate that directly rushes ahead (8), through flow-disturbing, drive urea to flow in tubule (9) together, most air-flow is by the perforate of tubule (9), and backboard (10), arrives carrier end face.Tubule (9) bottom design has aperture plate (11), and (11) have porous to aperture plate, and are evenly arranged.There is sub-fraction to be given vent to anger by aperture plate (11), directly reach carrier end face.The catalyst SCR on carrier (12) surface reacts, and reacted gas is discharged by steam outlet pipe (19).
As described in Figure 2, on front screen (8), have 7 apertures, due to the corner at front screen (8) and tubule (9), urea directly sprays, and urea can be directly low in this dead band from the aperture of tubule (9), very easily forms urea crystals.Front screen (8) is opened 7 apertures, and fraction can directly enter in aperture, avoids the existence in dead band, effectively can prevent the generation of urea crystals phenomenon.
As described in Figure 3, backboard (10) has 4 macropores, and have certain distance with carrier end face, to ensure good velocity uniformity and suitable system back pressure.
Above-mentioned by reference to the accompanying drawings to invention has been exemplary description, but specific implementation of the present invention is not subject to the restrictions described above.As long as have employed the improvement of the various unsubstantialities that design of the present invention and technological scheme are carried out, or design of the present invention and technological scheme directly applied to other occasion, all within protection scope of the present invention without improving.
Adopt technological scheme of the present invention, not only can improve the Flow Distribution uniformity of catalyst carrier internal gas flow, effectively can prevent the solids particles precipitate blocking catalyst carrier channel in urea crystals and tail gas simultaneously, thus improve the transformation efficiency of whole catalytic reduction after-treatment system.
Claims (10)
1. a nozzle integrated form SCR after-treatment device, is characterized in that comprising reactor shell, front screen (8), backboard (10), rear orifice plate (15);
Described reactor shell comprises the front cover be made up of front outer end cap (3) and front inner end cap (4), the front case be made up of front inner housing (5) and front casing body (7), packing casing (14), rear case (16), rear end cover (18);
Described front cover is provided with suction tude (1) and nozzle (2), nozzle (2) is integrated to be arranged on SCR after-treatment device, front screen (8) and backboard (10) are installed in front case, tubule (9) is provided with between front screen (8) and backboard (10), one end that tubule (9) is positioned at backboard (10) is provided with aperture plate (11), be connected by packing casing (14) between front case and rear case (16), carrier (12) is provided with in packing casing (14), be provided with between carrier (12) and packing casing (14) and encapsulate liner (13), rear orifice plate (15) is arranged in rear case (16), perforate on rear orifice plate (15) is connected with steam outlet pipe (19) one end, steam outlet pipe (19) the other end passes rear end cover (18), rear orifice plate (15), rear case (16), rear end cover (18), silencing cotton (17) is filled with in the interval that steam outlet pipe (19) surrounds.
2. nozzle integrated form SCR after-treatment device according to claim 1, is characterized in that described carrier (12) is coated with catalyzer.
3. nozzle integrated form SCR after-treatment device according to claim 1, is characterized in that in the middle of described front inner end cap (4) and front outer end cap (3), and front inner housing (5) and front casing body (7) centre are all provided with heat-preservation cotton (6).
4. nozzle integrated form SCR after-treatment device according to claim 1, is characterized in that the injection central point of described nozzle (2) is in the front portion of tubule (9), and in projection, in the circle of tubule (9).
5. nozzle integrated form SCR after-treatment device according to claim 1, it is characterized in that described suction tude (1) and tubule (9), in the direction of the air flow, stagger in cross section.
6. nozzle integrated form SCR after-treatment device according to claim 1, is characterized in that described front screen (8) also has 7 apertures, to prevent this regional gas stream dead band, causes urea crystals.
7. nozzle integrated form SCR after-treatment device according to claim 1, is characterized in that described aperture plate (11) has porous, and is evenly arranged.
8. nozzle integrated form SCR after-treatment device according to claim 1, it is characterized in that described tubule (9) is at length direction, and circumferencial direction has perforate, and is evenly arranged.
9. nozzle integrated form SCR after-treatment device according to claim 1, is characterized in that described backboard (10) has 4 macropores, and has certain distance with carrier end face, to ensure good velocity uniformity and system back pressure.
10. the exhaust gas treating method of a nozzle integrated form SCR after-treatment device as described in any one of claim 1-9, it is characterized in that: it is inner that off-gas flows reaches SCR after-treatment device by suction tude (1), nozzle (2) is to SCR after-treatment device internal spray aqueous solution of urea, waste gas directly rushes ahead on baffle plate (8), through flow-disturbing, urea is driven to flow in tubule (9) together, overwhelming majority air-flow passes through perforate and backboard (10) the arrival carrier end face of tubule (9), there is sub-fraction to be given vent to anger by aperture plate (11) and directly arrive carrier end face, airstream compartment before carrier, employing double-layer heat insulation designs, avoid gas flow temperature to decline and cause the decline of catalytic conversion efficiency, also there is urea crystals phenomenon under avoiding worst cold case, the catalyst SCR on carrier (12) surface reacts, reacted gas is discharged by steam outlet pipe (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510247166.8A CN104847463A (en) | 2015-05-15 | 2015-05-15 | Nozzle integrated SCR post treatment unit and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510247166.8A CN104847463A (en) | 2015-05-15 | 2015-05-15 | Nozzle integrated SCR post treatment unit and method thereof |
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| CN104847463A true CN104847463A (en) | 2015-08-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437966A (en) * | 2016-10-24 | 2017-02-22 | 无锡威孚力达催化净化器有限责任公司 | Axial feeding integrated type SCR aftertreatment mixing cavity |
| CN107178412A (en) * | 2017-06-29 | 2017-09-19 | 杭州银轮科技有限公司 | Cartridge type SCR encapsulation inlet end assemblies are entered in side |
| CN107701264A (en) * | 2017-11-25 | 2018-02-16 | 华东交通大学 | A kind of integral exhaust purifying muffler for being used to improve sound quality |
| CN108252776A (en) * | 2017-12-23 | 2018-07-06 | 无锡威孚力达催化净化器有限责任公司 | Cartridge type exhaust aftertreatment encapsulates internal insulation structure |
| CN108678843A (en) * | 2018-06-28 | 2018-10-19 | 无锡恒和环保科技有限公司 | A kind of diesel SCR catalytic exhaust apparatus |
-
2015
- 2015-05-15 CN CN201510247166.8A patent/CN104847463A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437966A (en) * | 2016-10-24 | 2017-02-22 | 无锡威孚力达催化净化器有限责任公司 | Axial feeding integrated type SCR aftertreatment mixing cavity |
| CN107178412A (en) * | 2017-06-29 | 2017-09-19 | 杭州银轮科技有限公司 | Cartridge type SCR encapsulation inlet end assemblies are entered in side |
| CN107178412B (en) * | 2017-06-29 | 2023-09-05 | 杭州银轮科技有限公司 | Side-feeding cylinder type SCR packaging air inlet end assembly |
| CN107701264A (en) * | 2017-11-25 | 2018-02-16 | 华东交通大学 | A kind of integral exhaust purifying muffler for being used to improve sound quality |
| CN107701264B (en) * | 2017-11-25 | 2023-12-19 | 华东交通大学 | Integrated exhaust purification muffler for improving sound quality |
| CN108252776A (en) * | 2017-12-23 | 2018-07-06 | 无锡威孚力达催化净化器有限责任公司 | Cartridge type exhaust aftertreatment encapsulates internal insulation structure |
| CN108678843A (en) * | 2018-06-28 | 2018-10-19 | 无锡恒和环保科技有限公司 | A kind of diesel SCR catalytic exhaust apparatus |
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Application publication date: 20150819 |