CN219865203U - Mixer and tail gas aftertreatment device - Google Patents
Mixer and tail gas aftertreatment device Download PDFInfo
- Publication number
- CN219865203U CN219865203U CN202321284305.0U CN202321284305U CN219865203U CN 219865203 U CN219865203 U CN 219865203U CN 202321284305 U CN202321284305 U CN 202321284305U CN 219865203 U CN219865203 U CN 219865203U
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- baffle
- mixer
- mixing
- pipeline
- barrel
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- 238000002156 mixing Methods 0.000 claims abstract description 67
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000004202 carbamide Substances 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 23
- 238000006243 chemical reaction Methods 0.000 description 14
- 238000010276 construction Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides a mixer for an exhaust gas aftertreatment device with the mixer, which can ensure the urea mixing effect, reduce the volume of the aftertreatment device, save space and reduce equipment cost.
Description
Technical Field
The utility model relates to the technical field of tail gas aftertreatment devices, in particular to a mixer and a tail gas aftertreatment device.
Background
The national sixth emission standard is a national sixth-stage motor vehicle pollutant emission standard, and is a standard formulated for preventing and controlling the pollution of the exhaust of the fuel engine automobile to the environment, protecting the ecological environment and guaranteeing the health of human bodies. With the announcement of the related departments, the national six-emission standard 6b stage is about to be fully implemented, and the production, import and sales of automobiles which do not meet the national six-emission standard 6b stage are forbidden. The standard emission policy falls to the ground, and the automobile industry is accelerated to enter a new green development stage.
Because the arrangement space of the whole vehicle is limited, strict requirements are made on the appearance structure and the space size of the tail gas aftertreatment of the diesel engine, as a key part for mixing urea and tail gas, a mixer of the aftertreatment device is focused, the space is required to be saved, a good urea mixing effect is achieved, and the back pressure control of the mixer is more and more strict along with the original stricter emission regulations. The chinese patent publication No. CN212898682U discloses a novel post-treatment mixer connection device, which has a high back pressure, and can cause unsmooth exhaust, increase the power consumed by the exhaust, reduce the effective output work of the engine, and reduce the combustion efficiency.
Some mixers are designed for better mixing, and the mixing section of the mixer structure is complex and difficult to process, but also increases the equipment cost.
Disclosure of Invention
In view of the above problems, the present utility model provides a mixer to have an exhaust gas aftertreatment device of the same, which can reduce the volume of the aftertreatment device, save space, and reduce equipment costs while ensuring urea mixing effects.
The technical scheme is as follows: the utility model provides a blender, includes the blender barrel, be provided with baffle, its characterized in that in the blender barrel: the baffle will the blender barrel shutoff completely, on the blender barrel and be located the front side of baffle is provided with urea nozzle mount pad, and urea nozzle installs on the urea nozzle mount pad, mixing pipeline is connected to urea nozzle mount pad's lower extreme, mixing pipeline passes the baffle extends to the rear side of baffle, mixing pipeline is located the window forms a plurality of air inlets on the position of the front side of baffle, and the air current is followed in the air inlet gets into mixing pipeline, with follow urea that spouts in the urea nozzle mixes, mixing pipeline is located the position of the rear side of baffle includes oblique angle mixing tube, oblique angle mixing tube's lower extreme is provided with the miter cut the rear side of baffle is equipped with the reflection deflector, the miter cut orientation reflection deflector sets up.
Further, a honeycomb carrier is arranged at the position of the mixing pipeline, which is positioned at the rear side of the baffle plate, and a catalyst coating is arranged on the honeycomb carrier.
Further, the honeycomb carrier is made of metal.
Further, the baffle includes first baffle portion and the second baffle portion of vertical setting and connects first baffle portion with the pipeline installation department of second baffle portion, pipeline installation department transversely sets up.
Further, the part of the mixing pipeline, which is positioned at the front side of the baffle plate, comprises a bowl-shaped mixing part, the upper end of the bowl-shaped mixing part is connected with the urea nozzle mounting seat through a connecting pipe, a mounting flange is correspondingly arranged on the pipeline mounting part, the lower end of the bowl-shaped mixing part is fixed on the mounting flange, and the lower end of the bowl-shaped mixing part is connected with the bevel mixing pipe.
Further, a rotational flow end cover is arranged at the upper end of the bowl-shaped mixing part, air inlets are arranged on the rotational flow end cover, and rotational flow fins are arranged on each air inlet.
Further, the cyclone end cover is arranged parallel to the pipeline installation part, and the air inlets are circumferentially arranged on the cyclone end cover.
Further, the reflection guide plate is provided with two guide surfaces which are arranged in an included angle mode, and the included angle formed by the guide surfaces faces the oblique notch.
Further, the mixer barrel is provided with a mounting hole corresponding to the urea nozzle mounting seat, an arc-shaped flange seat matched with the barrel wall of the mixer barrel is arranged on the mounting hole, and the urea nozzle mounting seat is arranged on the arc-shaped flange seat.
The tail gas aftertreatment device is characterized by comprising the mixer, wherein an SCR unit is arranged at the rear side of the mixer, and the SCR unit adopts a honeycomb metal SCR carrier.
According to the mixer, the baffle is designed to completely plug the mixer cylinder, the tail gas is limited by the baffle to generate rotational flow, the mixer directly forms a plurality of air inlets by windowing on the mixing pipeline, the tail gas enters the mixing pipeline from the air inlets to form rotational flow, and the rotational flow is mixed with urea sprayed from the urea nozzle at the upper end of the mixing pipeline, so that the mixer has a good urea atomization mixing effect, the mixing pipeline is simple in structure, and the cost of the rotational flow pipe is reduced;
compared with the existing mixer, the mixer has single function and only plays a role of atomizing urea, the mixer provided by the utility model can atomize urea and is provided with a honeycomb carrier, the honeycomb carrier is provided with a catalyst coating, the atomized urea also reacts with NO and NO2 in tail gas, and the reaction temperature is higher than that of a rear SCR unit when the mixer is close to the DPF unit and compared with the existing tail gas aftertreatment device; the mixer of the utility model utilizes the longitudinal space to arrange the honeycomb carrier, can reduce the length of SCR at the rear end, can shorten the overall length of the exhaust aftertreatment device, and the honeycomb carrier adopts the honeycomb carrier supported by metal, compared with the traditional cordierite honeycomb structure carrier, the back pressure is smaller, and the design requirement of the national sixth emission standard is more easily met.
Drawings
FIG. 1 is a perspective view of a mixer in one embodiment;
FIG. 2 is a front view of a mixer in one embodiment;
FIG. 3 is a schematic cross-sectional view taken along the direction A-A of FIG. 2;
FIG. 4 is a schematic view of an embodiment of a mixer hiding a first view behind a barrel;
FIG. 5 is a schematic view of an embodiment of a mixer hiding a second view behind a barrel;
FIG. 6 is a graph comparing SCR conversion efficiencies at 200℃of an exhaust temperature for an aftertreatment device employing a new construction mixer and a wire mesh construction mixer, respectively, of the present utility model;
FIG. 7 is a graph comparing SCR conversion efficiencies at 250℃for exhaust temperatures for aftertreatment devices employing the novel and wire mesh mixers, respectively, of the present utility model.
Detailed Description
The Selective Catalytic Reduction (SCR) technology is a treatment technology for NOx in the exhaust emission of diesel vehicles, namely urea is sprayed in under the action of a catalyst to reduce the NOx in the exhaust into N2 and H2O, and the reaction in a mixer is as follows: urea is decomposed after being sprayed into high-temperature exhaust gas:
NH2CONH2+H2O→2NH3+CO2
after decomposition, ammonia reacts with nitrogen oxides:
4NH3+4NO+O2→4N2+6H2O
4NH3+2NO+2NO2→4N2+6H2O
4NH3+2NO2+O2→3N2+6H2O
as mentioned in the background, due to the overall implementation of the state six emission standard 6b stage, in order to ensure the reaction effect of the SCR unit in the exhaust gas aftertreatment device, it is necessary to mix the injected urea with the engine exhaust gas in a mixer, while minimizing the risk of urea crystallization in the mixer. The design of the mixer which can save space and has good urea mixing effect has great significance.
In view of the current demand, see fig. 1 to 5, the utility model provides a mixer, comprising a mixer barrel 1, wherein a baffle plate 2 is arranged in the mixer barrel 1, the baffle plate 2 is used for completely blocking the mixer barrel 1, a urea nozzle mounting seat 3 is arranged on the front side of the baffle plate 2 on the mixer barrel 1, a urea nozzle is arranged on the urea nozzle mounting seat 3, the lower end of the urea nozzle mounting seat 3 is connected with a mixing pipeline 4, the mixing pipeline 4 passes through the baffle plate 2 to extend to the rear side of the baffle plate 2, a part of the mixing pipeline 4 positioned at the front side of the baffle plate 2 is windowed to form a plurality of air inlets 5, air flows enter the mixing pipeline 4 from the air inlets 5 and are mixed with urea sprayed from the urea nozzle, the part of the mixing pipeline positioned at the rear side of the baffle plate 2 comprises an oblique angle mixing pipe 41, the lower end of the oblique angle mixing pipe 41 is provided with an oblique notch 42, the rear side of the baffle plate is provided with a reflection guide plate 6, and the oblique notch 42 is arranged towards the reflection guide plate 6.
In the embodiment, baffle 2 carries out complete shutoff with mixer barrel 1, the tail gas that gets into mixer barrel 1 has produced the whirl owing to baffle 2's restriction in the mixer barrel 1, the direct window of windowing on mixing tube 4 of blender forms a plurality of air inlets 5, tail gas gets into mixing tube 4 from air inlet 5 and forms the whirl, mix with urea that spouts in the urea nozzle of mixing tube upper end, have fine urea atomizing mixing effect, mixing tube simple structure reduces the whirl pipe cost, through being equipped with reflection deflector 6 in the rear side of baffle in the embodiment, and make the inclined notch 42 set up towards reflection deflector 6, the air current forms the air current reflection with reflection deflector 6, reach the effect of striking atomizing, make urea can fully mix with waste gas and hydrolysise the atomizing.
In one embodiment of the utility model, the mixing pipe is provided with a honeycomb carrier 7 at the rear side of the baffle, the honeycomb carrier 7 is provided with a catalyst coating, the honeycomb carrier 7 is made of metal, and the metal honeycomb carrier 7 is welded on the bevel mixing pipe 41 in the embodiment; the honeycomb is internally provided with a catalyst coating, the catalyst coating comprises a V base, an FE base, a CU base and the like, the mixer in the embodiment is arranged through the honeycomb carrier 7, the urea is atomized and simultaneously reacts with NO and NO2 in tail gas, and in a post-treatment device with six national standards, the reaction is close to a DPF unit, the temperature is higher than that of a subsequent SCR unit, and the reaction effect is good. Through the honeycomb carrier's in the mixing pipeline setting for the blender is both the blender, is the SCR carrier again, is difficult for crystallization, and atomization effect is good, and the blender has characteristics such as being heated soon, back pressure is low.
In one embodiment, the baffle 2 includes first and second baffle portions 21 and 21 disposed vertically and a duct mounting portion 23 connecting the first and second baffle portions 21 and 22, the duct mounting portion 23 being disposed laterally, an area where the exhaust gas entering the mixer drum 1 can form a swirling flow is formed by the arrangement of the first, second and duct mounting portions 21 and 22, so that the flow rate of the exhaust gas can be increased, thereby producing a better mixing effect.
In one embodiment, the part of the mixing pipeline 41 located at the front side of the baffle plate comprises a bowl-shaped mixing part 43, the upper end of the bowl-shaped mixing part 43 is connected with the urea nozzle mounting seat 3 through a connecting pipe 44, a mounting flange 45 is correspondingly arranged on the pipeline mounting part, the lower end of the bowl-shaped mixing part 43 is fixed on the mounting flange 45, the lower end of the bowl-shaped mixing part 43 is connected with an oblique angle mixing 41 pipe, the upper end of the bowl-shaped mixing part 43 is provided with a rotational flow end cover 46, the rotational flow end cover 46 is provided with air inlets 5, each air inlet 5 is provided with a rotational flow fin 47, and the included angle between the rotational flow fin 47 and the air inlet is an acute angle, so that the air inlet guiding effect can be generated.
The swirl end cover 46 is provided parallel to the duct mounting portion 23, and the air inlets 5 are circumferentially arranged on the swirl end cover 46. When the current airflow flows in the mixer cylinder 1, the baffle plate 2 can only flow in from the cyclone end cover 46, the airflow cyclone enters the cyclone end cover 46, and negative pressure is formed by cyclone in the bowl-shaped mixing part 43, so that urea is smoothly mixed with cyclone gas; the structure adopts plane rotational flow, thereby reducing the manufacturing difficulty; and negative pressure urea particle extraction can be realized, and air flow enters the bowl-shaped mixing part 43 of the mixer after urea is mixed together, so that better mixing effect is generated.
In one embodiment, the reflection guide plate 6 has two guide surfaces 61 arranged in an included angle, the included angle formed by the guide surfaces 61 is set towards the oblique notch 42, and the two guide surfaces 61 can form double-sided emission of atomized air flow, so that the air flow reaches the SCR port, and the uniformity coefficient is good.
In one embodiment, the mixer cylinder 1 is provided with a mounting hole corresponding to the urea nozzle mounting seat 2, the mounting hole is provided with an arc-shaped flange seat 8 matched with the cylinder wall of the mixer cylinder 1, the urea nozzle mounting seat 2 is mounted on the arc-shaped flange seat 8, and the strength of the structure can be increased due to the arrangement of the arc-shaped flange seat 8.
In an embodiment of the present utility model, there is further provided an exhaust gas aftertreatment device, including the mixer in the above implementation, the rear side of the mixer being provided with an SCR unit, the SCR unit being a honeycomb metal SCR carrier. Because the mixer of the tail gas aftertreatment device utilizes the longitudinal space to set up the honeycomb carrier, the length of SCR at the rear end can be reduced, the overall length of the tail gas aftertreatment device can be shortened, and the honeycomb carrier in the mixer and the honeycomb carrier supported by the SCR unit by metal are smaller in back pressure and easier to meet the design requirement of national six-emission standard compared with the traditional cordierite honeycomb structure carrier.
Tests were performed on a bench using the mixer and wire mesh structure mixer provided by the present utility model.
FIG. 6 is a graph comparing SCR conversion efficiencies at 200℃for a post-treatment device using a new-structure mixer and a wire mesh-structure mixer of the present utility model, respectively, and it can be seen that the SCR conversion efficiency after using the new mixer is significantly faster than that of the old mixer at 200℃for a low-temperature condition, 80% conversion efficiency can be achieved at 20 seconds, and the highest efficiency reaches 88%; whereas the old mixer structure requires 170s to reach 80% conversion efficiency, the highest efficiency is only 84%.
FIG. 7 is a graph comparing SCR conversion efficiencies at 250℃for an aftertreatment device employing a new construction mixer and a wire mesh construction mixer, respectively, of the present utility model; the conversion efficiency rate of the mixer with the new structure is obviously faster than that of the old mixer, the conversion efficiency can reach 90% in 10s, the old mixer structure needs 65s to reach 90% in 90%, and the highest efficiency of the mixer and the old mixer can reach 99% at the exhaust temperature.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The utility model provides a blender, includes the blender barrel, be provided with baffle, its characterized in that in the blender barrel: the baffle will the blender barrel shutoff completely, on the blender barrel and be located the front side of baffle is provided with urea nozzle mount pad, and urea nozzle installs on the urea nozzle mount pad, mixing pipeline is connected to urea nozzle mount pad's lower extreme, mixing pipeline passes the baffle extends to the rear side of baffle, mixing pipeline is located windowing on the position of the front side of baffle forms a plurality of air inlets, mixing pipeline is located the position of the rear side of baffle includes oblique angle mixing tube, oblique angle mixing tube's lower extreme is provided with the oblique incision the rear side of baffle is equipped with the reflecting guide plate, the oblique incision orientation reflecting guide plate sets up.
2. A mixer according to claim 1, wherein: the mixing pipeline is provided with a honeycomb carrier at the rear side of the baffle plate, and a catalyst coating is arranged on the honeycomb carrier.
3. A mixer according to claim 2, characterized in that: the honeycomb carrier is made of metal.
4. A mixer according to claim 1, wherein: the baffle comprises a first baffle part, a second baffle part and a pipeline installation part, wherein the first baffle part and the second baffle part are vertically arranged, the pipeline installation part is connected with the first baffle part and the second baffle part, and the pipeline installation part is transversely arranged.
5. A mixer according to claim 4, wherein: the part that mixing pipeline is located the front side of baffle includes bowl form mixing portion, and the upper end of bowl form mixing portion passes through the connecting pipe and connects urea nozzle mount pad, correspond on the pipeline installation portion to be equipped with mounting flange, the lower extreme of bowl form mixing portion is fixed on the mounting flange, the lower extreme of bowl form mixing portion is connected still with oblique angle mixing tube is connected.
6. A mixer according to claim 5, wherein: the upper end of the bowl-shaped mixing part is provided with a rotational flow end cover, the rotational flow end cover is provided with air inlets, each air inlet is provided with a rotational flow fin, and the included angle between each rotational flow fin and each air inlet is an acute angle.
7. A mixer according to claim 6, wherein: the rotational flow end cover is parallel to the pipeline installation part, and the air inlets are circumferentially arranged on the rotational flow end cover.
8. A mixer according to claim 6, wherein: the reflection guide plate is provided with two guide surfaces which are arranged at an included angle, and the included angle formed by the guide surfaces faces the oblique notch.
9. A mixer according to claim 6, wherein: the mixer barrel is provided with a mounting hole corresponding to the urea nozzle mounting seat, the mounting hole is provided with an arc-shaped flange seat matched with the barrel wall of the mixer barrel, and the urea nozzle mounting seat is mounted on the arc-shaped flange seat.
10. The utility model provides a tail gas aftertreatment device which characterized in that: a mixer comprising the method of claim 1, wherein the rear side of the mixer is provided with an SCR unit, and the SCR unit adopts a honeycomb metal SCR carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321284305.0U CN219865203U (en) | 2023-05-25 | 2023-05-25 | Mixer and tail gas aftertreatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321284305.0U CN219865203U (en) | 2023-05-25 | 2023-05-25 | Mixer and tail gas aftertreatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219865203U true CN219865203U (en) | 2023-10-20 |
Family
ID=88339674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321284305.0U Active CN219865203U (en) | 2023-05-25 | 2023-05-25 | Mixer and tail gas aftertreatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219865203U (en) |
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2023
- 2023-05-25 CN CN202321284305.0U patent/CN219865203U/en active Active
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