CN112943423A - Rotational flow blade type mixer - Google Patents
Rotational flow blade type mixer Download PDFInfo
- Publication number
- CN112943423A CN112943423A CN202110392897.7A CN202110392897A CN112943423A CN 112943423 A CN112943423 A CN 112943423A CN 202110392897 A CN202110392897 A CN 202110392897A CN 112943423 A CN112943423 A CN 112943423A
- Authority
- CN
- China
- Prior art keywords
- urea
- mixer
- inner cylinder
- swirl
- blades
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000004202 carbamide Substances 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006722 reduction reaction 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
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
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 swirl blade type mixer which comprises an inner cylinder and an outer cylinder which are coaxially arranged, wherein a grid frame is arranged in the inner cylinder, a cavity of the inner cylinder is divided into a plurality of runners by the grid frame, an inclined blade extends out of the frame edge of each runner, the inclined blade forms a block for urea liquid in the runner and enables the urea liquid to be crushed, and a plurality of swirl blades are uniformly distributed between the inner cylinder and the outer cylinder, so that air flow passing through a gap between the two cylinders forms swirl. The rotational flow blade type mixer is provided with the inclined blades which are regularly arranged and are more in number, so that the urea crushing and decomposing effect is greatly enhanced, the rotational flow blades are additionally arranged to enable airflow to be disordered in a spiral mode, the airflow speed is accelerated, the urea mixing path is increased, the accumulation of liquid urea on the mixer and the lower flow pipe wall of the mixer is avoided, the urea crystallization is effectively eliminated, and the problem of low carrier conversion efficiency is solved.
Description
Technical Field
The invention relates to the technical field of diesel engine tail gas treatment, in particular to a swirl vane type mixer.
Background
In order to solve the problem of overhigh content of pollutants in the tail gas of the diesel engine, the tail gas is treated by adopting Selective Catalytic Reduction (SCR) technology widely used for diesel engine emission, and the gas density in an SCR system is used for NOXHas a great influence on the reduction and urea decomposition of the gaseous NOXAnd NH3The higher the mixing uniformity, the more complete the reaction, NOXThe higher the conversion efficiency. Thereby increasing the amount of exhaust gas and NH in the SCR system3Uniformity of mixing is an important means of improving the performance of an SCR system. As shown in figure 4, an ejector 2 ' is arranged on an exhaust pipe 1 ', a mixer 3 ' is arranged in the exhaust pipe, a urea column ejected by the ejector 2 ' is beaten on the mixer 3 ', and after being crushed and atomized, liquid urea is mixed with tail gas with a certain flow rate and flows into the downstream of the mixer along the inner wall of the pipe, and the tail gas is degraded under the catalytic action of a catalytic carrier.
FIG. 5 shows a mixer structure of the prior art, in which fan blades 4 'are provided to be inclined at four positions, and urea columns hit the blades 4' to be crushed and atomized. However, due to insufficient air velocity, too short mixing path and other factors, the urea crushing and decomposing effect is affected, so that the urea is crushed insufficiently and urea crystals are easily formed on the mixer and the wall of the downstream pipe of the mixer. Therefore, further optimization is required.
Disclosure of Invention
The invention aims to provide a swirl vane type mixer, which optimizes the structure of the original mixer, enhances the crushing and atomization of urea, increases the mixing distance of urea and tail gas and avoids urea crystallization.
In order to achieve the purpose, the invention adopts the following technical scheme:
a swirl vane type mixer comprises an inner cylinder and an outer cylinder which are coaxially arranged, wherein a grid frame is arranged in the inner cylinder, a cavity of the inner cylinder is divided into a plurality of runners by the grid frame, an inclined vane extends out of the frame edge of each runner, the inclined vane forms a stop for urea liquid in the runner and enables the urea liquid to be broken, and a plurality of swirl vanes are uniformly distributed between the inner cylinder and the outer cylinder, so that air flow passing through a gap between the two cylinders forms swirl.
In particular, the inclined blades are uniformly arranged on the rims of the horizontal rows or the rims of the vertical columns, and the inclined blades of the adjacent rows or columns are oppositely oriented.
In particular, the angled vanes are angled at 60 ° to the cross-section of the grid frame.
In particular, the projection of the inclined blade on the corresponding flow passage section is trapezoidal, and the projection edge does not exceed the frame edge of the flow passage.
Compared with the prior art, the invention has the advantages that the swirl vane type mixer is provided with the inclined vanes which are arranged in order and have more quantity, so that the urea crushing and decomposing effect is greatly enhanced, meanwhile, the swirl vanes are added to enable airflow to be disordered in a spiral mode, the airflow speed is accelerated, the urea mixing path is increased, the accumulation of liquid urea on the mixer and the lower flow pipe wall of the mixer is avoided, the urea crystallization is effectively eliminated, and the problem of low carrier conversion efficiency is solved.
Drawings
FIG. 1 is a schematic structural diagram of a swirl vane mixer provided in an embodiment of the present invention;
FIG. 2 is an end view of a swirl vane mixer provided by an embodiment of the present invention;
FIG. 3 is a side view of a swirl vane mixer provided by an embodiment of the present invention;
FIG. 4 is a schematic representation of the use of a urea mixer in exhaust aftertreatment;
FIG. 5 is a schematic diagram of a conventional mixer.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1 to 3, the present embodiment provides a swirl vane mixer, which includes an inner cylinder 1 and an outer cylinder 2, which are coaxially disposed, wherein a grid frame 3 is disposed in the inner cylinder 1, and the grid frame 3 divides a chamber of the inner cylinder 1 into flow channels 4.
The frame of each flow channel 4 extends upwards to form an inclined blade 5, and the inclined blades 5 form a block for the urea liquid in the flow channel 4 and break the urea liquid. In order to facilitate the molding and reduce the molding difficulty of the blades with complex shapes, all the inclined blades 5 are uniformly arranged on the frame edges of the transverse rows or the frame edges of the vertical rows, and the inclined blades 5 of adjacent rows or columns are opposite in orientation, so that the urea solution can be crushed and atomized by the shape.
Preferably, the inclined blades 5 form an angle of 60 ° with the cross section of the grid frame 3, the projection of the inclined blades 5 on the cross section of the corresponding flow channel 4 is trapezoidal, and the projected edge does not exceed the frame edge of the flow channel 4, so as not to excessively affect the urea flow.
A plurality of swirl blades 6 are uniformly distributed between the inner cylinder body 1 and the outer cylinder body 2, so that the air flow passing through the gap between the two cylinder bodies forms swirl, the air flow is disordered in a spiral mode, the air flow speed is accelerated, a urea mixing path is increased, and the mixing effect is improved.
In conclusion, the swirl vane type mixer is provided with the inclined vanes which are regularly arranged and have a large number, so that the urea crushing and decomposing effect is greatly enhanced, meanwhile, the swirl vanes are added to enable airflow to be disordered in a spiral manner, the airflow speed is accelerated, the urea mixing path is increased, the accumulation of liquid urea on the mixer and the lower flow pipe wall of the mixer is avoided, the urea crystallization is effectively eliminated, and the problem of low carrier conversion efficiency is solved.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but is capable of various modifications and changes without departing from the spirit and scope of the invention, which are intended to be within the scope of the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A swirl vane type mixer is characterized by comprising an inner cylinder body and an outer cylinder body which are coaxially arranged, wherein a grid frame is arranged in the inner cylinder body, a cavity of the inner cylinder body is divided into flow channels by the grid frame, an inclined vane extends out of the frame edge of each flow channel, the inclined vane forms a stop for urea liquid in the flow channel and enables the urea liquid to be broken, and a plurality of swirl vanes are uniformly distributed between the inner cylinder body and the outer cylinder body, so that air flow passing through a gap between the two cylinder bodies forms swirl.
2. The swirl vane mixer of claim 1, wherein: the inclined blades are uniformly arranged on the frame edges of the horizontal rows or the vertical rows, and the inclined blades of the adjacent rows or the adjacent rows are opposite in orientation.
3. The swirl vane mixer of claim 1, wherein: the inclined blades and the cross section of the grid frame form an included angle of 60 degrees.
4. The swirl vane mixer of claim 1, wherein: the projection of the inclined blade on the section corresponding to the flow channel is trapezoidal, and the edge of the projection does not exceed the frame edge of the flow channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110392897.7A CN112943423A (en) | 2021-04-13 | 2021-04-13 | Rotational flow blade type mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110392897.7A CN112943423A (en) | 2021-04-13 | 2021-04-13 | Rotational flow blade type mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112943423A true CN112943423A (en) | 2021-06-11 |
Family
ID=76231930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110392897.7A Withdrawn CN112943423A (en) | 2021-04-13 | 2021-04-13 | Rotational flow blade type mixer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112943423A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685251A (en) * | 2021-09-27 | 2021-11-23 | 无锡威孚力达催化净化器有限责任公司 | SCR tight coupling mixer |
-
2021
- 2021-04-13 CN CN202110392897.7A patent/CN112943423A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685251A (en) * | 2021-09-27 | 2021-11-23 | 无锡威孚力达催化净化器有限责任公司 | SCR tight coupling mixer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210611 |
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| WW01 | Invention patent application withdrawn after publication |