CN111764988A - Aftertreatment encapsulation SCR blender unit - Google Patents
Aftertreatment encapsulation SCR blender unit Download PDFInfo
- Publication number
- CN111764988A CN111764988A CN202010605606.3A CN202010605606A CN111764988A CN 111764988 A CN111764988 A CN 111764988A CN 202010605606 A CN202010605606 A CN 202010605606A CN 111764988 A CN111764988 A CN 111764988A
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- mixer
- flow
- inlet
- swirler
- outlet
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- 238000005538 encapsulation Methods 0.000 title description 3
- 239000004202 carbamide Substances 0.000 claims abstract description 48
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 17
- 230000008676 import Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 17
- 229910021529 ammonia Inorganic materials 0.000 abstract description 7
- 238000001704 evaporation Methods 0.000 abstract description 7
- 230000008020 evaporation Effects 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 5
- 230000008025 crystallization Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007062 hydrolysis Effects 0.000 abstract description 2
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a post-treatment packaged SCR mixer unit, which comprises a mixer cylinder, wherein the mixer cylinder is provided with a mixer inlet and a mixer outlet, a urea nozzle opening is formed in the side wall of the mixer cylinder, and a flow guide mechanism is arranged in the mixer cylinder. The invention combines and unifies the design of the mixer and the design of the package, and utilizes the space structure to form a flow field which is beneficial to the rapid crushing, evaporation, hydrolysis and even distribution of the urea solution, promotes the crushing and evaporation of urea droplets and the conversion of urea to ammonia, reduces the crystallization risk of urea, realizes the even distribution of ammonia and exhaust at the SCR inlet, and reduces the overall backpressure of the mixer.
Description
Technical Field
The invention belongs to the technical field of engine tail gas purification, and particularly relates to an after-treatment packaged SCR mixer unit.
Background
Selective Catalytic Reduction (SCR) refers to the Selective Catalytic Reduction of NOx to N with high selectivity and preference under the condition that the oxygen concentration is higher than the NOx concentration by more than two orders of magnitude by using ammonia, ammonia water, urea or hydrocarbons as reducing agents2Thereby realizing that the tail gas is processed to meet the emission standard of Europe II. The mixer unit is present in the diesel aftertreatment system, in front of the SCR catalyst, to promote the breaking up of urea droplets, evaporation and conversion of urea to ammonia. The SCR mixer unit is used to improve SCR catalyst inlet NH3 concentration and exhaust velocity uniformity. The incomplete crushing and evaporation of urea liquid drops can cause the reduction of NOx conversion rate, and urea crystals are formed to block the internal structure. The uneven distribution of ammonia gas concentration and exhaust velocity reduces the NOx conversion efficiency, and can cause uneven aging of the catalyst, which affects the performance of the SCR catalyst.
In the prior art, the invention patent of urea cyclone mixer with Chinese publication No. CN108005763A specifically discloses a urea cyclone mixer, which comprises a cylinder body, wherein two ends of the cylinder body are both opened, one end of the cylinder body is used as an air inlet, and the other end of the cylinder body is used as an air outlet; a Z-shaped baffle is arranged in the cylinder body, and the Z-shaped baffle divides the inner cavity of the cylinder body into a front cavity and a rear cavity; a rotational flow piece and a perforated pipe are arranged in the cylinder body, and the rotational flow piece and the perforated pipe are connected to the transverse part of the Z-shaped baffle; the rotational flow piece is communicated with the perforated pipe; the rotational flow piece is positioned in the front cavity of the cylinder body, and the porous pipe is positioned in the rear cavity of the cylinder body; the rotational flow piece is provided with rotational flow blades; the top end of the rotational flow piece is connected with a nozzle, and the nozzle extends out of the circumferential surface of the cylinder; the pipe wall of the porous pipe is provided with a plurality of air holes. The cyclone mixer ensures that urea is hydrolyzed completely, is not easy to crystallize, has low back pressure and is compact in section.
The invention discloses a cylindrical SCR (selective catalytic reduction) aftertreatment mixing device with a Chinese publication number of CN108167050A, which specifically comprises a urea mixing cavity, wherein the front end and the rear end of the urea mixing cavity are respectively connected with a first quick-mounting and dismounting flange and a second quick-mounting and dismounting flange, an airflow mixer and an airflow homogenizer are respectively fixed at the front and the rear of the urea mixing cavity, the urea mixer is arranged in the urea mixing cavity, and a urea injection base is arranged on the side wall of the urea mixing cavity. The urea spraying base and the urea mixer are arranged at an angle of 90 degrees. The device has the advantages of simple structure, excellent design, high ammonia mixing efficiency, convenient assembly and disassembly, and convenient treatment if urea crystallization is generated under special conditions in the later period, and is suitable for national IV and V emission standards.
The above prior patents have the following disadvantages: (1) the existing design only designs a mixer independently, and cannot realize the integrated design of the mixer and an aftertreatment system; (2) the existing design can not effectively utilize the packaging structure and space of the post processor, thus causing the waste of resources; (3) the existing mixer structure design generally has the defects that when the structure is simple, the urea solution is broken and has poor evaporation, and urea crystals are easy to form; (4) the existing scheme is designed to be welded in the mixer, urea corrosion is easily generated at a welding spot, and the service life of the mixer is shortened.
Disclosure of Invention
It is an object of the present invention to address the above-mentioned deficiencies of the background art by providing an aftertreatment package SCR mixer unit.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a post-treatment encapsulation SCR blender unit, includes the blender barrel, the blender barrel has blender import and blender export, be provided with urea nozzle mouth on the lateral wall of blender barrel, be provided with water conservancy diversion mechanism in the blender barrel.
In the above technical scheme, the guide mechanism comprises an air inlet fluid director, an internal guide pipe and a flow expansion swirler which are sequentially connected, the air inlet fluid director is communicated with a mixer inlet of the mixer barrel, and the flow expansion swirler is communicated with a mixer outlet of the mixer barrel.
In the technical scheme, the air inlet fluid director is provided with an inlet and an outlet, the inlet is attached to the inner wall of the mixer inlet of the mixer cylinder and used for guiding air flow into the air inlet fluid director, and the outlet is communicated with the inlet of the internal flow guide pipe.
In the above technical solution, the inlet of the air inlet guide is arranged obliquely with respect to the mixer inlet of the mixer drum, and the inlet has a rectangular opening shape and the outlet has a circular opening shape.
In the above technical scheme, a plurality of flow guide grooves are arranged on the inner wall of the air inlet flow guider at intervals.
In the above technical scheme, the flow expansion swirler is in a flat horn shape, and an inner cavity of the flow expansion swirler is gradually enlarged from the top to the bottom.
In the technical scheme, the top of the flow expansion swirler is provided with a swirl inlet, the swirl inlet is connected with the outlet of the internal flow guide pipe, and the bottom of the flow expansion swirler is hermetically connected with the inner wall of the mixer barrel.
In the technical scheme, a plurality of circles of swirl outlets arranged at intervals are arranged on the side wall of the side, away from the outlet of the mixer, of the flow expansion swirler, and each swirl outlet is obliquely provided with swirl vanes.
Compared with the prior art, the method has the following beneficial effects:
firstly, the design of the mixer and the design of packaging are combined and unified, a flow field which is beneficial to rapid crushing, evaporation, hydrolysis and even distribution of the urea solution is formed by utilizing a spatial structure, the crushing and evaporation of urea droplets and the conversion of urea to ammonia are promoted, the risk of urea crystallization is reduced, the uniform distribution of ammonia and exhaust gas at an SCR inlet is realized, and the overall backpressure of the mixer is reduced.
Secondly, the inlet of the air inlet flow guider is obliquely arranged relative to the mixer inlet of the mixer cylinder, the opening of the inlet is rectangular, and the opening of the outlet is circular and has a closing effect on air flow, so that the air flow is smoothly gathered and gathered, and the mixing of the urea solution and the air flow is promoted.
Thirdly, the flow-expanding swirler of the invention is in a flat horn shape, and the inner cavity of the flow-expanding swirler is gradually enlarged from the top to the bottom, so that the airflow forms a good diffusion effect.
Fourthly, a plurality of circles of swirl outlets arranged at intervals are arranged on the side wall of the flow expansion swirler, which is far away from the outlet of the mixer, each swirl outlet is provided with swirl blades in an inclined mode, the swirl blades are arranged on one side, and the swirl blade structure can promote the mixing effect of air flow.
And the airflow bypasses the flow expansion swirler to heat the air inlet flow guider, the internal flow guide pipe and the flow expansion swirler so as to prevent urea crystallization.
Drawings
FIG. 1 is a schematic structural diagram of a mixer unit according to the present embodiment;
FIG. 2 is a schematic diagram of a right side view of the mixer unit shown in FIG. 1;
FIG. 3 is a schematic left side view of the mixer unit of FIG. 1;
FIG. 4 is a schematic structural diagram of a flow guide mechanism according to this embodiment;
FIG. 5 is a side view of the deflector mechanism of FIG. 4;
in the figure: 1-mixer cylinder, 1.1-mixer inlet, 1.2-mixer outlet, 2-urea nozzle, 3-guide mechanism, 3.1-air inlet guide device, 3.11-inlet, 3.12-outlet, 3.13-guide groove, 3.2-internal guide tube, 3.3-flow expansion cyclone, 3.31-cyclone inlet, 3.32-cyclone outlet, 3.33-cyclone blade.
Detailed Description
The present invention will be described in further detail with reference to specific examples to facilitate the clear understanding of the invention, but the present invention is not limited thereto.
As shown in fig. 1, the aftertreatment packaged SCR mixer unit of the embodiment includes a mixer cylinder 1, the mixer cylinder 1 has a mixer inlet 1.1 and a mixer outlet 1.2, a urea nozzle opening 2 is provided on a side wall of the mixer cylinder 1, and a flow guide mechanism 3 is provided in the mixer cylinder 1. The diversion mechanism 3 comprises an air inlet fluid director 3.1, an internal diversion pipe 3.2 and a flow expansion swirler 3.3 which are sequentially connected, the air inlet fluid director 3.1 is communicated with a mixer inlet 1.1 of the mixer barrel 1, and the flow expansion swirler 3.3 is communicated with a mixer outlet 1.2 of the mixer barrel 1.
As shown in fig. 2 and 3, the air inlet deflector 3.1 has an inlet 3.11 and an outlet 3.12, the inlet 3.11 is attached to the inner wall of the mixer inlet 1.1 of the mixer barrel 1 for guiding the air flow into the air inlet deflector 3.1, and the outlet 3.12 is communicated with the inlet of the internal draft tube 3.2.
In the above technical solution, the inlet 3.11 of the air inlet fluid director 3.1 is obliquely arranged relative to the mixer inlet 1.1 of the mixer cylinder 1, the opening of the inlet 3.11 is rectangular, and the opening of the outlet 3.12 is circular, so as to close up the inlet, promote the smooth gathering of the air flow, and promote the mixing of the urea solution and the air flow; the inner wall of the air inlet fluid director 3.1 is provided with a plurality of flow guide grooves 3.13 at intervals.
As shown in fig. 4 and 5, the flow-expanding swirler 3.3 is in a flat horn shape, and an inner cavity of the flow-expanding swirler 3.3 is gradually enlarged from the top to the bottom, so that the airflow forms a good diffusion effect. The top of the flow expansion swirler 3.3 is provided with a rotational flow inlet 3.31, the rotational flow inlet 3.31 is connected with an outlet of the inner flow guide pipe 3.2, and the bottom of the flow expansion swirler 3.3 is hermetically connected with the inner wall of the mixer barrel 1. A plurality of circles of swirl outlets 3.32 which are arranged at intervals are arranged on the side wall of one side of the flow expansion swirler 3.3, which is far away from the mixer outlet 1.2, and each swirl outlet 3.32 is obliquely provided with swirl vanes 3.33. The swirl vanes are arranged on one side, and the swirl vane structure can promote the mixing action of air flow; the airflow bypasses the flow expansion swirler 3.3 to form a reverse flow effect, so that the mixing effect of the mixer is promoted to be achieved; and the air current bypasses the flow expansion swirler 3.3 to heat the air inlet fluid director 3.1, the internal flow guide pipe 3.2 and the flow expansion swirler 3.3, so as to prevent urea crystallization. The exhaust air flow enters the mixer unit, and the air flow is in the enclosed space formed by the upper half part of the mixer cylinder 1 and the air inlet fluid director 3.1, so that the air flow enters the flow expansion swirler 3.3 through the internal flow guide pipe 3.2. The airflow is in a diffusion state in the flow expansion swirler 3.3, then the airflow passes through the rotational flow blades on the wall of the flow expansion swirler 3.3 to force the airflow to rotate, and then the airflow is forced to flow out through two sides of the flow expansion swirler 3.3 in a space formed by the mixer barrel 1, the air inlet fluid director 3.1, the internal flow guide pipe 3.2 and the flow expansion swirler 3.3.
The method for processing by using the post-processing packaged SCR mixer unit comprises the following steps:
1) injecting urea from a urea nozzle opening 2 into the mixer unit so that the gas flow is mixed with the urea for the first time;
2) the gas flow mixed with urea flows through the internal flow guide pipe 3.2 to enter the flow expansion swirler 3.3 under the closing-in action of the gas inlet fluid director 3.1, and the urea and the gas flow are mixed for the second time under the flow expansion action of the flow expansion swirler 3.3;
3) the mixed components of urea and air flow pass through the rotational flow blades 3.33 of the flow expansion cyclone 3.3 to form rotary air flow, so that the urea and the air flow are promoted to be mixed for the third time;
4) the gas flow mixed with urea flows out from two sides of the flow expanding cyclone 3.3 under the action of the inner space of the mixer unit, and the gas flow at two sides of the downstream position of the gas flow collides, so that the urea and the gas flow are mixed for the fourth time;
5) the mixed components of urea and gas stream that have undergone four times of mixing are discharged from the mixer unit.
The above description is only for the specific embodiments of the present invention, and it should be noted that the remaining detailed descriptions are related to the prior art, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. An aftertreatment packaged SCR mixer unit, characterized in that: including blender barrel (1), blender barrel (1) has blender import (1.1) and blender export (1.2), be provided with urea nozzle mouth (2) on the lateral wall of blender barrel (1), be provided with water conservancy diversion mechanism (3) in blender barrel (1).
2. The aftertreatment package SCR mixer unit of claim 1, wherein: the flow guide mechanism (3) comprises an air inlet fluid director (3.1), an internal flow guide pipe (3.2) and a flow expansion swirler (3.3) which are sequentially connected, the air inlet fluid director (3.1) is communicated with a mixer inlet (1.1) of the mixer barrel body (1), and the flow expansion swirler (3.3) is communicated with a mixer outlet (1.2) of the mixer barrel body (1).
3. The aftertreatment package SCR mixer unit of claim 2, wherein: the air inlet fluid director (3.1) is provided with an introducing port (3.11) and an outlet (3.12), the introducing port (3.11) is attached to the inner wall of the mixer inlet (1.1) of the mixer barrel (1) and used for guiding air flow into the air inlet fluid director (3.1), and the outlet (3.12) is communicated with the inlet of the internal flow guide pipe (3.2).
4. The aftertreatment package SCR mixer unit of claim 3, wherein: the inlet (3.11) of the air inlet guide device (3.1) is obliquely arranged relative to the mixer inlet (1.1) of the mixer cylinder body (1), the opening shape of the inlet (3.11) is rectangular, and the opening shape of the outlet (3.12) is circular.
5. The aftertreatment package SCR mixer unit of claim 4, wherein: the inner wall of the air inlet fluid director (3.1) is provided with a plurality of flow guide grooves (3.13) at intervals.
6. The aftertreatment package SCR mixer unit of claim 5, wherein: the flow-expanding swirler (3.3) is in a flat horn shape, and the inner cavity of the flow-expanding swirler (3.3) is gradually enlarged from the top to the bottom.
7. The aftertreatment package SCR mixer unit of claim 6, wherein: the top of the flow expansion swirler (3.3) is provided with a swirl inlet (3.31), the swirl inlet (3.31) is connected with an outlet of the internal flow guide pipe (3.2), and the bottom of the flow expansion swirler (3.3) is hermetically connected with the inner wall of the mixer barrel (1).
8. The aftertreatment package SCR mixer unit of claim 7, wherein: a plurality of circles of swirl outlets (3.32) which are arranged at intervals are arranged on the side wall of one side of the flow expansion swirler (3.3) far away from the mixer outlet (1.2), and each swirl outlet (3.32) is obliquely provided with swirl blades (3.33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605606.3A CN111764988B (en) | 2020-06-29 | 2020-06-29 | Aftertreatment encapsulation SCR blender unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605606.3A CN111764988B (en) | 2020-06-29 | 2020-06-29 | Aftertreatment encapsulation SCR blender unit |
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| Publication Number | Publication Date |
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| CN111764988A true CN111764988A (en) | 2020-10-13 |
| CN111764988B CN111764988B (en) | 2021-11-12 |
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| CN202010605606.3A Active CN111764988B (en) | 2020-06-29 | 2020-06-29 | Aftertreatment encapsulation SCR blender unit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10024217B1 (en) * | 2017-08-22 | 2018-07-17 | Cummins Emission Solutions Inc. | Reductant decomposition reactor chamber |
| CN207905898U (en) * | 2017-12-23 | 2018-09-25 | 无锡威孚力达催化净化器有限责任公司 | A kind of mixing arrangement that rotating flow guidance is combined with mesh |
| CN110410185A (en) * | 2019-07-03 | 2019-11-05 | 东风商用车有限公司 | A kind of crystallization-preventive close-coupled urea mixing device |
| CN110735693A (en) * | 2019-11-25 | 2020-01-31 | 无锡威孚力达催化净化器有限责任公司 | Urea mixer for exhaust gas aftertreatment |
| CN110748402A (en) * | 2019-12-06 | 2020-02-04 | 无锡威孚力达催化净化器有限责任公司 | U-shaped post-processor urea mixing device |
-
2020
- 2020-06-29 CN CN202010605606.3A patent/CN111764988B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10024217B1 (en) * | 2017-08-22 | 2018-07-17 | Cummins Emission Solutions Inc. | Reductant decomposition reactor chamber |
| CN207905898U (en) * | 2017-12-23 | 2018-09-25 | 无锡威孚力达催化净化器有限责任公司 | A kind of mixing arrangement that rotating flow guidance is combined with mesh |
| CN110410185A (en) * | 2019-07-03 | 2019-11-05 | 东风商用车有限公司 | A kind of crystallization-preventive close-coupled urea mixing device |
| CN110735693A (en) * | 2019-11-25 | 2020-01-31 | 无锡威孚力达催化净化器有限责任公司 | Urea mixer for exhaust gas aftertreatment |
| CN110748402A (en) * | 2019-12-06 | 2020-02-04 | 无锡威孚力达催化净化器有限责任公司 | U-shaped post-processor urea mixing device |
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| Publication number | Publication date |
|---|---|
| CN111764988B (en) | 2021-11-12 |
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