CN211230589U - Mixing device of engine aftertreatment system - Google Patents
Mixing device of engine aftertreatment system Download PDFInfo
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- CN211230589U CN211230589U CN201922237941.8U CN201922237941U CN211230589U CN 211230589 U CN211230589 U CN 211230589U CN 201922237941 U CN201922237941 U CN 201922237941U CN 211230589 U CN211230589 U CN 211230589U
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- flaring portion
- aftertreatment system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
A mixing device of an engine post-treatment system is arranged between a DPF device and an SCR device, a DPF carrier is arranged in the DPF device, an SCR carrier is arranged in the SCR device, the mixing device of the engine post-treatment system comprises a rotary cavity and a mixing component, the rotary cavity is provided with an air inlet end and an air outlet end, the air inlet end is provided with a nozzle seat for mounting a urea nozzle, the mixing component is arranged at the joint of the air outlet end of the rotary cavity and the SCR device, a flow guide convex bag extending into the mixing component is integrally formed inwards at the lower part of the rotary cavity, and the mixing component comprises a first mixer and a second mixer sleeved in the first mixer; from this, the utility model provides high conversion efficiency has fine stability, and the rotatory no backward flow that accelerates of air current in the blender is difficult for producing the urea crystallization for U type exhaust aftertreatment system more has stability, efficient conversion efficiency, and stronger anti crystallization ability.
Description
Technical Field
The utility model relates to an engine exhaust aftertreatment's technical field especially relates to a mixing arrangement of engine aftertreatment system suitable for U type exhaust aftertreatment system.
Background
With the increase of environmental protection, the national standard for the emission of engine exhaust pollutants is continuously upgraded. Upgrading of emission standards PM (particulate matter), CO (carbon monoxide), HC (hydrocarbon) and NO emitted to engine exhaustX(nitrogen oxide) requirements are also getting more and more stringent. The SCR (selective catalytic reduction) technology can react harmful substance NO in engine exhaust through selective catalytic reductionX(Nitrogen oxides) to form harmless substances N2(Nitrogen) and H2O (water). The operating principle of SCR (selective catalytic reduction) is: the urea solution is sprayed into an exhaust pipe of an engine and is fully mixed with high-temperature tail gas in the exhaust pipe after being atomized, crushed and evaporated by a tail gas aftertreatment mixing device of the engine. The urea solution is pyrolyzed and hydrolyzed into NH at high temperature3(Ammonia gas) and CO2，NH3(Ammonia gas) reacts with harmful substance NO in engine tail gas under the action of selective catalystXThe nitrogen oxide is subjected to reduction reaction to generate harmless substance N2(Nitrogen) and H2O (water). In order to fully react the chemical components and improve the conversion efficiency of the exhaust system, an engine exhaust aftertreatment mixing device is needed to help the urea solution entering the exhaust pipe to be more fully crushed, atomized and evaporated. NH resulting from decomposition of urea solution at high temperature3(ammonia gas) is more evenly distributed on the surface of the SCR (selective catalytic reduction) carrier.
In a conventional U-shaped exhaust gas aftertreatment mixing device, mixing of a urea solution and engine exhaust gas is generally achieved by providing a metal structure such as a perforated plate, a perforated pipe, and a blade. When the urea solution collides with metal parts such as the porous plate, the porous pipe and the blade, the urea solution is crushed, so that the urea solution is evaporated and pyrolyzed.
The prior art has the following disadvantages:
(1) the uniformity of the flow field on the surface of the SCR (selective catalytic reduction) carrier and the distribution of ammonia gas is greatly influenced by the flow state of the upstream gas, and the ideal uniform state cannot be stably maintained.
Because the flow rate, the air pressure and the injection quantity of the urea solution discharged by the engine can fluctuate irregularly along with different road conditions of vehicle running (especially obvious in the aftertreatment of a U-shaped structure of a diesel engine), the existing mixing device for the exhaust aftertreatment of the engine is sensitive to the flow state of upstream gas and can not stably decompose NH (NH) formed by the urea solution at high temperature3(ammonia gas) is uniformly distributed on the surface of the SCR (selective catalytic reduction) carrier. NH on SCR (Selective catalytic reduction) support3In the area with excessive (ammonia gas), ammonia leakage is easy to occur, and the environment is polluted. And NH3The lean (ammonia) regions will cause Nitrogen Oxides (NO)X) Can not be reduced completely, and part of harmful Nitrogen Oxide (NO)X) Is directly discharged into the atmosphere, and pollutes the environment. Non-uniform NH3The direct manifestation of the (ammonia) distribution is that the conversion efficiency of SCR (selective catalytic reduction) does not meet the regulatory requirements, and furthermore the NH is present for a long time3Uneven distribution of (ammonia gas) can also lead to uneven aging of the SCR (selective catalytic reduction) support, thereby affecting the overall performance of the system.
(2) Existing exhaust aftertreatment systems, particularly mixing elements, often have low flow velocity regions therein, which can make the mixer less resistant to crystallization.
In the existing type of scheme, a low flow velocity area often exists in the mixer, and the airflow suddenly changes direction when passing through the rotary cavity, and the condition of distribution of the high and low flow velocity areas in the mixer is likely to be aggravated by instability of the incoming flow of the mixer. The urea aqueous solution is crushed, evaporated and pyrolyzed too quickly in the high flow rate zone, while a large amount of urea is deposited in the low flow rate zone.
In view of the above-mentioned drawbacks, the present invention provides a hybrid device for an engine aftertreatment system, which is designed by the designer through careful research and design to overcome the above-mentioned drawbacks.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an engine aftertreatment system's mixing arrangement, its simple structure, convenient operation has stable mixing ability and anti crystallization ability, lower manufacturing cost and the assembly degree of difficulty, has fine robustness to U type exhaust aftertreatment system.
In order to achieve the above object, the utility model discloses an engine aftertreatment system's mixing arrangement sets up between DPF device and SCR device, be equipped with the DPF carrier in the DPF device, be equipped with the SCR carrier in the SCR device, its characterized in that:
the mixing arrangement of engine aftertreatment system is including gyration chamber and hybrid module, the gyration chamber is equipped with the inlet end and gives vent to anger the end, inlet end and DPF device intercommunication, give vent to anger the end and communicate in hybrid module, the inlet end is equipped with the nozzle holder with installation urea nozzle, hybrid module sets up between the junction of giving vent to anger end and SCR device in gyration chamber, the inside integrated into one piece in lower part in gyration chamber has the water conservancy diversion convex closure that stretches into hybrid module, hybrid module contains first blender and the second blender that the cover inlayed in first blender.
Wherein: the first mixer, the second mixer and the rotary cavity are formed together, and the flow guide convex hulls are embedded and installed together with the shaft.
Wherein: the first blender contains cylindric body, first blender flaring portion and first blender neck, cylindric body and first blender neck are connected respectively and are set up from cylindric body leanin to the both ends of first blender flaring portion, the periphery equidistance interval of first blender flaring portion is equipped with a plurality of first blender flaring portion through-holes, the periphery of first blender neck is equipped with a plurality of first blender neck guiding vanes, the certain angle setting of first blender neck guiding vane leanin.
Wherein: the second blender contains second blender flaring portion and second blender neck, the second blender flaring portion leans out from the second blender neck, the periphery equidistance interval of second blender flaring portion is equipped with a plurality of second blender flaring portion guide vanes, the certain angle setting of second blender flaring portion guide vane leanin.
Wherein: the plurality of first mixer neck guide vanes are arranged in a certain angle of the periphery of the first mixer neck at intervals.
Wherein: the neck of the second mixer is embedded into the neck of the first mixer to form a mixing channel together, and the flared part of the second mixer is positioned below the flared part of the first mixer.
Wherein: the inclined angle of the first mixer flaring portion is the same as that of the second mixer flaring portion, and the first mixer flaring portion is parallel to the second mixer flaring portion.
Wherein: the flow guiding direction of the first mixer neck guide vane is the same as that of the second mixer flared guide vane.
Wherein: the inlet end in gyration chamber is fixed to the DPF device through connecting the clamp connection, the inlet end in gyration chamber and the exit end of DPF device all are equipped with flange, connect the clamp in the flange both sides of gyration chamber and DPF device in order to realize firm the connection.
According to the above structure, the mixing device of the engine post-treatment system of the present invention has the following effects:
1. the method solves the problems of low conversion efficiency, poor stability and easy generation of crystallization in a U-shaped exhaust aftertreatment system in a common mixing method.
2. And the mixed gas of the airflow and the urea aqueous solution is guided by the guide vanes of the first mixer and the second mixer, rotates and is mixed in an accelerating way. The mixing channel formed by matching the parts increases the mixing path and mixing time, and fully mixes, thereby improving the conversion efficiency.
3. The first mixer and the second mixer which are designed into the neck and flaring shapes have good stability under the conditions that the airflow distribution in the rotary cavity in the U-shaped exhaust aftertreatment system is extremely uneven and the airflow distribution changes strongly under different working conditions.
4. The airflow rotates in the mixer at an accelerated speed without backflow, and urea crystallization is not easy to generate. Be equipped with this utility model's U type exhaust aftertreatment system more has stability, efficient conversion efficiency, and stronger anti crystallization ability.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
Fig. 1 shows an isometric view of a portion of an engine exhaust aftertreatment system to which the present invention is applied.
Fig. 2 shows an assembly view of a portion of an engine exhaust aftertreatment system to which the present invention is applied.
Fig. 3 shows a cross-sectional view of a portion of an engine exhaust aftertreatment system to which the present invention is applied.
Fig. 4 shows an isometric view of a hybrid device of the engine aftertreatment system of the present invention.
Fig. 5 shows another perspective view of a mixing device of the engine aftertreatment system of the present invention.
Fig. 6 shows an assembly view of the mixing device of the engine aftertreatment system of the present invention.
Fig. 7 shows a schematic structural diagram of the first mixer of the present invention.
Fig. 8 shows a schematic structure diagram of the second mixer of the present invention.
Reference numerals:
1. a DPF device; 2. a rotation chamber; 3. a mixing assembly; 4. an SCR device; 5. a nozzle holder; 6. connecting a clamp; 7. a flow guide convex hull; 8. a first mixer; 9. a second mixer; 10. A first mixer flared portion through hole; 11. a first mixer flare; 12. a first mixer neck guide vane; 13. a first mixer neck; 14. a second mixer flared guide vane; 15. a second mixer flare; 16. a second mixer neck; 17. a DPF carrier; 18. An SCR carrier.
Detailed Description
Referring to fig. 1, fig. 2 and fig. 3, there are shown application schematic diagrams of a mixing device of an engine post-treatment system of the present invention, the mixing device is disposed between a DPF (diesel particulate filter) device 1 and an SCR (selective catalytic reduction) device 4, a DPF (diesel particulate filter) carrier 17 is disposed in the DPF device 1, and an SCR (selective catalytic reduction) carrier 18 is disposed in the SCR (selective catalytic reduction) device 4, wherein the DPF device 1 and the SCR device 4 are disposed in parallel.
Referring to fig. 4, 5 and 6 together, the mixing device of the engine aftertreatment system comprises a rotating chamber 2 and a mixing assembly 3, the rotary cavity 2 is provided with an air inlet end and an air outlet end, the air inlet end is communicated with the DPF device 1, the air outlet end is communicated with the mixing component 3, wherein, the rotary cavity 2 can be a U-shaped rotary cavity with an upper opening and a lower opening as shown in the figure, the upper end is an air inlet end, the lower end is an air outlet end, the air inlet end is provided with a nozzle seat 5, to install a urea nozzle, the mixing component 3 is arranged between the air outlet end of the rotary cavity 2 and the SCR device 4, wherein the air inlet end of the rotary cavity 2 can be connected and fixed to the DPF device 1 through a connecting clamp 6, the lower part of the rotary cavity is internally and integrally formed with a flow guide convex hull 7 extending into the mixing component 3, and the mixing component 3 comprises a first mixer 8 and a second mixer 9 embedded in the first mixer.
The first mixer 8 is provided with a through hole and a guide vane, the second mixer 9 is provided with a guide vane, and the first mixer, the second mixer and a guide convex hull formed together with the rotary cavity are installed in a shaft-sleeved embedded mode.
Optionally, the inlet end in gyration chamber 2 and the exit end of DPF device 1 all are equipped with flange, 6 clamps of connection clamp are in gyration chamber 2 and DPF device 1's flange both sides in order to realize the inlet end in gyration chamber 2 and DPF device 1's firm connection.
Therefore, the tail gas firstly enters the rotary cavity after coming out of the DPF device, the airflow is turned under the action of the rotary cavity and is mixed with the urea solution in the rotary cavity, then the airflow and the urea solution jointly enter the mixing assembly, part of the airflow and the urea solution pass through the guide vanes on the first mixer to form rotary airflow, the rotary airflow is accelerated and rotated in the flow channels among the first mixer, the second mixer and the guide convex bag, the rotary airflow enters the SCR device after being fully mixed, and the other part of the airflow and the urea solution pass through the through holes of the first mixer to reach the second mixer and pass through the guide vanes of the second mixer to be fully and rotatably mixed and enter the SCR device.
Referring to fig. 7 and 8 simultaneously, first blender 8 contains cylindric body, first blender flaring portion 11 and first blender neck 13, cylindric body and first blender neck 13 are connected respectively to the both ends of first blender flaring portion 11 and are set up from cylindric body leanin, and the junction is the circular arc and connects, the peripheral equidistance interval of first blender flaring portion 11 is equipped with a plurality of first blender flaring portion through-holes 10, the periphery of first blender neck 13 is equipped with a plurality of first blender neck guide vanes 12, first blender neck guide vanes 12 inwards incline certain angle setting, preferably, as shown in fig. 7, a plurality of first blender neck guide vanes 12 intervals set up in first blender neck 13 periphery.
The second mixer neck 16 engages the first mixer neck 13, which together form a mixing channel, and the second mixer flared section 15 is located below the first mixer flared section 11.
Therefore, one part of mixed gas of the airflow and the urea aqueous solution enters a mixing channel formed by the first mixer and the second mixer through the blade on the neck of the first mixer in an accelerating rotation mode, and the other part of mixed gas directly reaches the flared part of the second mixer through the through hole of the flared part of the first mixer, so that the direction of the mixed gas is changed in the axial direction and the circumferential direction of the first mixer, and the gas and the urea aqueous solution are fully mixed.
The mixed air flow rotated by the first mixer guide vane accelerates to rotate in the mixing channel, and the mixed air flow in the mixing channel has two outflow modes. The first type is that the rotating mixed airflow passes through the second mixer flaring part guide vane and then accelerates and rotates again together with the mixed airflow entering from the first mixer through hole to directly enter the SCR device, and the second type is that the rotating mixed airflow passes through the mixing channel formed by the neck part of the first mixer and the neck part of the second mixer to enter the mixing channel formed by the neck part of the second mixer and the guide convex hull to turn and continue to rotate and mix in the channel and finally enters the SCR device.
The inclined angle of the first mixer flaring portion is the same as that of the second mixer flaring portion, and the first mixer flaring portion is parallel to the second mixer flaring portion.
Therefore, the two guide vanes force the mixed gas flow which is originally and freely developed in the rotary cavity to be changed into rotary mixing in the same direction, the time and the mixing distance for mixing urea liquid drops and tail gas are increased, the evaporation and pyrolysis of the urea liquid drops are further improved, and the deposition of urea solution is prevented. In addition, the mixed gas flow is forced to change the initial flow state, and no matter how unevenly the upstream gas flow is distributed, the mixed gas flow rotates into the SCR device, and the mode improves the stability of the mixer. The characteristics of the two guide vanes comprise the number, size, length and distribution of the vanes, and can be adjusted according to the distribution condition of upstream airflow, so that the flexibility of the device is improved.
The first mixer neck guide vane and the second mixer flared guide vane are both opened inwards. The guide direction of the first mixer neck guide vane and the second mixer flared guide vane can be clockwise or anticlockwise, but the guide directions are necessarily the same. The mixed gas flows are rotationally mixed in the same direction without mutual disturbance, and the mixing time and the mixing distance of the urea liquid drops and the tail gas are increased.
The shape, size, quantity and distribution of the flared part through holes of the first mixer can be adjusted according to the distribution condition of upstream air flow, so that the flexibility of the device is improved, partial mixed gas is guided to be diffused in the circumferential direction by the flared part through holes, the condition that peripheral mixed gas is insufficient is made up, and the air flow entering the SCR device is distributed more uniformly.
To sum up, the utility model discloses a mixing arrangement of a set of same axle sleeve inlay installation has solved common mixed method conversion efficiency low, poor stability, the easy problem that produces the crystallization in U type exhaust after treatment system. And the mixed gas of the airflow and the urea aqueous solution is guided by the guide vanes of the first mixer and the second mixer, rotates and is mixed in an accelerating way. The mixing channel formed by matching the parts increases the mixing path and mixing time, and fully mixes, thereby improving the conversion efficiency. The first mixer and the second mixer with the neck and flaring shape design have good stability under the conditions that the airflow distribution in a rotary cavity in the U-shaped exhaust aftertreatment system is extremely uneven and the airflow distribution changes strongly under different working conditions. The design structure has no dead angle, the airflow rotates in the mixer at an accelerated speed without backflow, and urea crystallization is not easy to generate. Be equipped with this utility model's U type exhaust aftertreatment system more has stability, efficient conversion efficiency, and stronger anti crystallization ability.
It is to be understood that the above description and illustrations are exemplary only and are not intended to limit the present disclosure, application, or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention is intended to include any embodiments that fall within the foregoing description and the appended claims.
Claims (9)
1. The utility model provides an engine aftertreatment system's mixing arrangement, sets up between DPF device and SCR device, be equipped with the DPF carrier in the DPF device, be equipped with the SCR carrier in the SCR device, its characterized in that:
the mixing arrangement of engine aftertreatment system is including gyration chamber and hybrid module, the gyration chamber is equipped with the inlet end and gives vent to anger the end, inlet end and DPF device intercommunication, give vent to anger the end and communicate in hybrid module, the inlet end is equipped with the nozzle holder with installation urea nozzle, hybrid module sets up between the junction of giving vent to anger end and SCR device in gyration chamber, the inside integrated into one piece in lower part in gyration chamber has the water conservancy diversion convex closure that stretches into hybrid module, hybrid module contains first blender and the second blender that the cover inlayed in first blender.
2. The hybrid device of an engine aftertreatment system of claim 1, wherein: the first mixer, the second mixer and the rotary cavity are formed together, and the flow guide convex hulls are embedded and installed together with the shaft.
3. The mixing device of an engine aftertreatment system according to claim 1 or 2, characterized in that: the first blender contains cylindric body, first blender flaring portion and first blender neck, cylindric body and first blender neck are connected respectively and are set up from cylindric body leanin to the both ends of first blender flaring portion, the periphery equidistance interval of first blender flaring portion is equipped with a plurality of first blender flaring portion through-holes, the periphery of first blender neck is equipped with a plurality of first blender neck guiding vanes, the certain angle setting of first blender neck guiding vane leanin.
4. The hybrid device of an engine aftertreatment system of claim 3, wherein: the second blender contains second blender flaring portion and second blender neck, the second blender flaring portion leans out from the second blender neck, the periphery equidistance interval of second blender flaring portion is equipped with a plurality of second blender flaring portion guide vanes, the certain angle setting of second blender flaring portion guide vane leanin.
5. The hybrid device of an engine aftertreatment system of claim 3, wherein: the plurality of first mixer neck guide vanes are arranged in a certain angle of the periphery of the first mixer neck at intervals.
6. The hybrid device of an engine aftertreatment system of claim 4, wherein: the neck of the second mixer is embedded into the neck of the first mixer to form a mixing channel together, and the flared part of the second mixer is positioned below the flared part of the first mixer.
7. The hybrid device of an engine aftertreatment system of claim 4, wherein: the inclined angle of the first mixer flaring portion is the same as that of the second mixer flaring portion, and the first mixer flaring portion is parallel to the second mixer flaring portion.
8. The hybrid device of an engine aftertreatment system of claim 4, wherein: the flow guiding direction of the first mixer neck flow guiding blade is the same as that of the second mixer neck flow guiding blade.
9. The hybrid device of an engine aftertreatment system of claim 1, wherein: the inlet end in gyration chamber is fixed to the DPF device through connecting the clamp connection, the inlet end in gyration chamber and the exit end of DPF device all are equipped with flange, connect the clamp in the flange both sides of gyration chamber and DPF device in order to realize firm the connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922237941.8U CN211230589U (en) | 2019-12-13 | 2019-12-13 | Mixing device of engine aftertreatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922237941.8U CN211230589U (en) | 2019-12-13 | 2019-12-13 | Mixing device of engine aftertreatment system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459875A (en) * | 2020-12-09 | 2021-03-09 | 无锡亿利环保科技有限公司 | Post-treatment urea mixing device |
| CN113187591A (en) * | 2021-06-16 | 2021-07-30 | 一汽解放汽车有限公司 | Variable mixer of engine SCR (Selective catalytic reduction) postprocessor and control method thereof |
| CN113775395A (en) * | 2021-10-18 | 2021-12-10 | 无锡威孚力达催化净化器有限责任公司 | Font mixing arrangement and aftertreatment system return |
-
2019
- 2019-12-13 CN CN201922237941.8U patent/CN211230589U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459875A (en) * | 2020-12-09 | 2021-03-09 | 无锡亿利环保科技有限公司 | Post-treatment urea mixing device |
| CN113187591A (en) * | 2021-06-16 | 2021-07-30 | 一汽解放汽车有限公司 | Variable mixer of engine SCR (Selective catalytic reduction) postprocessor and control method thereof |
| CN113187591B (en) * | 2021-06-16 | 2022-08-23 | 一汽解放汽车有限公司 | Variable mixer of engine SCR (Selective catalytic reduction) postprocessor and control method thereof |
| CN113775395A (en) * | 2021-10-18 | 2021-12-10 | 无锡威孚力达催化净化器有限责任公司 | Font mixing arrangement and aftertreatment system return |
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Address after: 201815 area E, 2nd floor, building 3, No. 1180, Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee after: Puheim Automotive Technology (Shanghai) Co.,Ltd. Address before: 201815 area E, 2nd floor, building 3, No. 1180, Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: EBERSPACHER EXHAUST TECHNOLOGY (SHANGHAI) Co.,Ltd. |
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