CN110439659B - Nozzle integrated SCR post-treatment urea mixing device - Google Patents
Nozzle integrated SCR post-treatment urea mixing device Download PDFInfo
- Publication number
- CN110439659B CN110439659B CN201910863601.8A CN201910863601A CN110439659B CN 110439659 B CN110439659 B CN 110439659B CN 201910863601 A CN201910863601 A CN 201910863601A CN 110439659 B CN110439659 B CN 110439659B
- Authority
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- China
- Prior art keywords
- partition plate
- hole pipe
- swirl
- mixing
- cyclone
- 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.)
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000004202 carbamide Substances 0.000 title claims abstract description 27
- 238000005192 partition Methods 0.000 claims abstract description 41
- 238000010926 purge Methods 0.000 claims abstract description 26
- 238000002425 crystallisation Methods 0.000 abstract description 6
- 230000008025 crystallization Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
- 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
-
- 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 relates to an SCR post-treatment urea mixing device, in particular to a nozzle integrated SCR post-treatment urea mixing device, and belongs to the technical field of SCR post-treatment urea mixing devices. The device comprises a mixing cylinder body, wherein a front baffle plate is arranged in the mixing cylinder body and positioned at the front part of a swirl hole pipe, and a channel for communicating swirl blade segments of the swirl hole pipe is arranged on the front baffle plate; the upper part of the front partition plate is provided with an upper purging window, the upper purging window faces the swirl blade section of the swirl hole pipe, the lower part of the front partition plate is provided with a lower purging window, and the lower purging window faces the mesh section of the swirl hole pipe. According to the invention, the purging window is arranged on the partition board, so that the urea crystallization risk can be effectively reduced, the gas mixing efficiency is greatly improved, and the tail gas treatment effect is ensured; the pressure relief groove of the rear partition plate can effectively reduce the back pressure so as to meet the back pressure requirement of the whole aftertreatment system.
Description
Technical Field
The invention relates to an SCR post-treatment urea mixing device, in particular to a nozzle integrated SCR post-treatment urea mixing device, and belongs to the technical field of SCR post-treatment urea mixing devices.
Background
With increasing strictness of diesel emission regulations, exhaust gas aftertreatment technology is a technical measure that must be adopted. The basic principle of SCR can meet the national IV and V emission standards, the urea injection system (commonly called a urea pump) is adopted to atomize a 32.5% concentration urea aqueous solution, then the atomized urea aqueous solution is sprayed into an exhaust pipe and mixed with engine exhaust gas, the urea aqueous solution is subjected to pyrolysis and hydrolysis reaction to generate ammonia (NH 3), harmful nitrogen oxide (NOx) in the diesel engine exhaust gas is converted into harmless nitrogen (N 2) and water under the action of a catalyst, and the primary task of the SCR route of the engine exhaust gas treatment technology is to fully mix the exhaust gas with ammonia mist and perform chemical reaction, and meanwhile, a sufficient temperature is ensured before the exhaust gas enters the catalyst. SCR in the prior art has the problem that tail gas and ammonia gas are insufficiently mixed in the process of treating automobile tail gas, and the condition of urea crystallization is easy to occur, so that incomplete tail gas treatment is caused, and the tail gas treatment effect is affected.
Disclosure of Invention
The invention aims to overcome the defects, and provides the nozzle integrated SCR post-treatment urea mixing device, which can effectively reduce the urea crystallization risk, greatly improve the gas mixing efficiency and ensure the tail gas treatment effect by arranging the purging window on the partition plate.
According to the technical scheme provided by the invention, the nozzle integrated SCR post-treatment urea mixing device comprises a mixing cylinder body, wherein a swirl hole pipe is vertically arranged in the mixing cylinder body, swirl blades are arranged on the upper surface of the swirl hole pipe, meshes are arranged on the lower surface of the swirl hole pipe, and the lower end of the swirl hole pipe is connected with a blanking cover, and the nozzle integrated SCR post-treatment urea mixing device is characterized in that: a supporting plate is arranged between the middle part of the cyclone hole pipe and the side wall of the mixing cylinder body, a U-shaped partition plate is arranged at the lower end of the cyclone hole pipe, a mesh section of the cyclone hole pipe extends between two end plates of the U-shaped partition plate, and the opening end of the U-shaped partition plate extends to the supporting plate;
a front baffle plate is arranged in the mixing cylinder body and positioned at the front part of the cyclone hole pipe, and a channel for communicating the cyclone blade segments of the cyclone hole pipe is arranged on the front baffle plate; an upper purging window is arranged at the upper part of the front partition plate, the upper purging window faces the swirl blade section of the swirl hole pipe, a lower purging window is arranged at the lower part of the front partition plate, and the lower purging window faces the mesh section of the swirl hole pipe; a rear baffle plate is arranged in the mixing cylinder body and positioned at the rear part of the cyclone hole pipe, and a plurality of pressure relief grooves are formed in the rear baffle plate and are communicated with mesh sections of the cyclone hole pipe; the rear end of the rear partition plate is provided with a cyclone partition plate, and a plurality of cyclone holes are formed in the cyclone partition plate.
Further, a mixing fin is arranged on one side of the pressure relief groove.
Further, a plurality of swirl holes are evenly distributed along the circumferential direction, and swirl mixing blades are arranged at the edges of the swirl holes.
Compared with the prior art, the invention has the following advantages:
the invention has simple, compact and reasonable structure, can effectively reduce the urea crystallization risk by arranging the purging window on the baffle plate, greatly improves the gas mixing efficiency and ensures the tail gas treatment effect; the pressure relief groove of the rear partition plate can effectively reduce the back pressure so as to meet the back pressure requirement of the whole aftertreatment system.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a perspective semi-sectional view of the present invention.
Fig. 3 is a perspective view of the front bulkhead.
Fig. 4 is a perspective view of the rear bulkhead.
Reference numerals illustrate: 1-mixing cylinder, 2-front baffle, 2.1-upper purge window, 2.2-lower purge window, 3-rear baffle, 3.1-pressure release groove, 3.2-mixing fin, 4-swirl hole pipe, 5-blanking cover, 6-supporting plate, 7-U-shaped baffle, 8-swirl baffle and 8.1-swirl mixing blade.
Detailed Description
The invention will be further described with reference to examples of embodiments in the accompanying drawings, in which:
As shown in fig. 1-4, the invention mainly comprises a mixing cylinder body 1, wherein a swirl hole pipe 4 is vertically arranged in the mixing cylinder body 1, swirl blades are arranged on the upper surface of the swirl hole pipe 4, meshes are arranged on the lower surface of the swirl hole pipe 4, and the lower end of the swirl hole pipe 4 is connected with a blanking cap 5.
A supporting plate 6 is arranged between the middle part of the swirl hole pipe 4 and the side wall of the mixing cylinder body 1, and the supporting plate 6 plays a supporting role on the swirl hole pipe 4. The lower end of the cyclone hole pipe 4 is provided with a U-shaped baffle 7, the mesh section of the cyclone hole pipe 4 extends into the space between the two end plates of the U-shaped baffle 7, and the opening end of the U-shaped baffle 7 extends to the supporting plate 6.
The mixing barrel 1 is internally provided with a front baffle plate 2, the front baffle plate 2 is positioned in front of the cyclone hole pipe 4, and the front baffle plate 2 is provided with a channel for communicating the cyclone blade segments of the cyclone hole pipe 4.
The upper part of the front partition plate 2 is provided with an upper purging window 2.1, the upper purging window 2.1 faces the swirl vane segment of the swirl hole pipe 4, the lower part of the front partition plate 2 is provided with a lower purging window 2.2, and the lower purging window 2.2 faces the mesh segment of the swirl hole pipe 4. In operation, the upper purge window 2.1 is used to purge the upper gas stream and the lower purge window 2.2 is used to purge the mesh section of possible crystallization.
The mixing cylinder body 1 is internally provided with a rear baffle plate 3, the rear baffle plate 3 is positioned at the rear part of the cyclone hole pipe 4, the rear baffle plate 3 is provided with a plurality of pressure relief grooves 3.1, and the pressure relief grooves 3.1 are communicated with mesh sections of the cyclone hole pipe 4. And a mixing fin 3.2 is arranged on one side of the pressure relief groove 3.1, and the mixing fin 3.2 can further improve the mixing effect of urea and tail gas. The pressure relief groove of the rear partition plate can effectively reduce the back pressure so as to meet the back pressure requirement of the whole aftertreatment system.
The rear end of the rear partition plate 3 is provided with a cyclone partition plate 8, the cyclone partition plate 8 is provided with a plurality of cyclone holes, the cyclone holes are uniformly distributed along the circumferential direction, and the edges of the cyclone holes are provided with cyclone mixing blades 8.1.
The working principle of the invention is as follows: when the device is specifically used, the air inlet of the mixing cylinder is connected with the exhaust pipe of the automobile engine, tail gas of the automobile engine enters the front of the front partition plate through the air inlet, then enters the swirl blade section of the swirl hole pipe through the channel of the front partition plate, urea solution enters the swirl blade section of the swirl hole pipe through the nozzle, after being mixed through the swirl hole pipe and the front partition plate, mixed gas enters the mesh section of the swirl hole pipe and is fully mixed, finally enters the swirl partition plate through the rear partition plate, and after being further uniformly mixed through the swirl partition plate, the urea solution is treated through the catalyst.
The invention has simple, compact and reasonable structure, can effectively reduce the urea crystallization risk by arranging the purging window on the baffle plate, greatly improves the gas mixing efficiency and ensures the tail gas treatment effect; the pressure relief groove of the rear partition plate can effectively reduce the back pressure so as to meet the back pressure requirement of the whole aftertreatment system.
Claims (3)
1. The utility model provides a nozzle integrated form SCR aftertreatment urea mixing arrangement, includes mixing barrel (1), is equipped with whirl hole pipe (4) perpendicularly in mixing barrel (1), and whirl hole pipe (4) upper portion surface is equipped with swirl vane, and whirl hole pipe (4) lower part surface is equipped with the mesh, and blanking cap (5), characterized by are connected to whirl hole pipe (4) lower extreme: a supporting plate (6) is arranged between the middle part of the cyclone hole pipe (4) and the side wall of the mixing cylinder body (1), a U-shaped partition plate (7) is arranged at the lower end of the cyclone hole pipe (4), a mesh section of the cyclone hole pipe (4) extends into the space between two end plates of the U-shaped partition plate (7), and the opening end of the U-shaped partition plate (7) extends to the supporting plate (6);
A front partition plate (2) is arranged in the mixing cylinder (1), the front partition plate (2) is positioned in front of the cyclone hole pipe (4), and a channel for communicating the cyclone blade segments of the cyclone hole pipe (4) is arranged on the front partition plate (2); an upper purging window (2.1) is arranged at the upper part of the front partition plate (2), the upper purging window (2.1) faces the swirl vane segment of the swirl hole pipe (4), a lower purging window (2.2) is arranged at the lower part of the front partition plate (2), and the lower purging window (2.2) faces the mesh segment of the swirl hole pipe (4); a rear partition plate (3) is arranged in the mixing cylinder (1), the rear partition plate (3) is positioned at the rear part of the cyclone hole pipe (4), a plurality of pressure relief grooves (3.1) are formed in the rear partition plate (3), and the pressure relief grooves (3.1) are communicated with mesh sections of the cyclone hole pipe (4); the rear end of the rear partition plate (3) is provided with a rotational flow partition plate (8), and a plurality of rotational flow holes are formed in the rotational flow partition plate (8).
2. The nozzle-integrated SCR aftertreatment urea mixing device of claim 1, wherein: and a mixing fin (3.2) is arranged on one side of the pressure relief groove (3.1).
3. The nozzle-integrated SCR aftertreatment urea mixing device of claim 1, wherein: the swirl holes are uniformly distributed along the circumferential direction, and swirl mixing blades (8.1) are arranged at the edges of the swirl holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910863601.8A CN110439659B (en) | 2019-09-12 | 2019-09-12 | Nozzle integrated SCR post-treatment urea mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910863601.8A CN110439659B (en) | 2019-09-12 | 2019-09-12 | Nozzle integrated SCR post-treatment urea mixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110439659A CN110439659A (en) | 2019-11-12 |
| CN110439659B true CN110439659B (en) | 2024-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910863601.8A Active CN110439659B (en) | 2019-09-12 | 2019-09-12 | Nozzle integrated SCR post-treatment urea mixing device |
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| Country | Link |
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| CN (1) | CN110439659B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111878197B (en) * | 2020-03-05 | 2022-06-10 | 广西玉柴机器股份有限公司 | Efficient SCR mixer |
| CN114483263B (en) * | 2022-01-13 | 2023-08-04 | 无锡威孚力达催化净化器有限责任公司 | Mixer for exhaust aftertreatment system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210799103U (en) * | 2019-09-12 | 2020-06-19 | 无锡威孚力达催化净化器有限责任公司 | Nozzle integrated SCR aftertreatment urea mixing arrangement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206016918U (en) * | 2016-08-30 | 2017-03-15 | 无锡威孚力达催化净化器有限责任公司 | A kind of carbamide injection mixed cell for cartridge type depurator |
| CN107939489A (en) * | 2017-12-23 | 2018-04-20 | 无锡威孚力达催化净化器有限责任公司 | Vent gas treatment urea mixing device |
| CN107939490A (en) * | 2017-12-23 | 2018-04-20 | 无锡威孚力达催化净化器有限责任公司 | Axis post-processes double-cyclone urea mixing device into nozzle integrated form SCR |
| CN108131183A (en) * | 2017-12-23 | 2018-06-08 | 无锡威孚力达催化净化器有限责任公司 | Axis post-processes urea mixing device into nozzle integrated form SCR |
| CN108087067A (en) * | 2017-12-23 | 2018-05-29 | 无锡威孚力达催化净化器有限责任公司 | Eddy flow urea mixing device |
| CN109488426B (en) * | 2019-01-28 | 2023-10-03 | 凯龙高科技股份有限公司 | Double-layer rotational flow vane type urea injection mixing unit |
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- 2019-09-12 CN CN201910863601.8A patent/CN110439659B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210799103U (en) * | 2019-09-12 | 2020-06-19 | 无锡威孚力达催化净化器有限责任公司 | Nozzle integrated SCR aftertreatment urea mixing arrangement |
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| CN110439659A (en) | 2019-11-12 |
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