CN109356693A - A kind of close-coupled mixer assembly - Google Patents
A kind of close-coupled mixer assembly Download PDFInfo
- Publication number
- CN109356693A CN109356693A CN201811347912.0A CN201811347912A CN109356693A CN 109356693 A CN109356693 A CN 109356693A CN 201811347912 A CN201811347912 A CN 201811347912A CN 109356693 A CN109356693 A CN 109356693A
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- air inlet
- outlet
- hole
- gas
- exocoel
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- 238000002156 mixing Methods 0.000 claims abstract description 65
- 238000005192 partition Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 claims description 12
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 241000237509 Patinopecten sp. Species 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 235000020637 scallop Nutrition 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 210000003734 kidney Anatomy 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 abstract description 20
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 108
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 26
- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 14
- 239000003054 catalyst Substances 0.000 description 13
- 230000006872 improvement Effects 0.000 description 8
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 239000004202 carbamide Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000013618 particulate matter Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
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 kind of close-coupled mixer assemblies, including outer housing, positioned at the air inlet drive end bearing bracket and outlet rear end cap at the outer housing both ends, and the intermediate mixing chamber limited by the air inlet drive end bearing bracket and outlet rear end cap, it is characterised in that connection baffle is equipped between the air inlet drive end bearing bracket and outlet rear end cap；Tail gas air inlet is offered on the air inlet drive end bearing bracket, mixed gas gas outlet is offered on the outlet rear end cap, and the tail gas air inlet and mixed gas gas outlet, which are staggered, is placed in the two sides of the connection baffle；Nozzle mounting base is equipped at the top of the intermediate mixing chamber.The present invention is designed by special flow passage structure, the mixer assembly is not only able in the blending space of very little, increase the mixing distance of tail gas and reducing agent, and mixed gas can be made to generate complicated rotation and centrifugal movement, to achieve the purpose that improve mixing efficiency and mixing uniformity.
Description
Technical field
The present invention relates to exhaust aftertreatment technical field more particularly to mixer field, specifically a kind of close-coupled
Mixer assembly.
Background technique
SCR, that is, selective catalytic reduction (Selective Catalytic Reduction) technology is mainly used for reducing bavin
Nitrogen oxides (NOx) content in oil turbine tail gas, can be divided into control system according to function difference, spraying system and SCR are urged
Change device three parts.The working principle of SCR technology is: control system is first according to the engine operating state data and nitrogen monitored
Then the emission behaviour of oxide, reduction dosage needed for calculating system control spraying system and are atomized quantitative reducing agent
It sprays into SCR catalyst, after reducing agent is mixed with the nitrogen oxides in tail gas, chemically reacts under the effect of the catalyst,
Harmless nitrogen and water are generated, to achieve the purpose that reduce nitrogen oxide in tail gas concentration.
Reducing agent in SCR is ammonia (NH3), is mainly pyrolyzed and is generated by the urea liquid of mass concentration 32.5%；Due to also
The generating process of former agent, and certain space length, thus SCR catalyst carrier are required with the process that is sufficiently mixed of tail gas
Front end usually requires to reserve biggish blending space, this also causes the volume of exhaust aftertreatment product to increase, and installation is arranged to it
Cause very big puzzlement.As emission regulation demands are increasingly strict and each main engine plants are to components miniaturization and integrated
It is required that the volume of exhaust aftertreatment product certainly will be needed to further reduce；Due to catalyst carrier in exhaust aftertreatment product
Volume is difficult to reduce, thus can only shorten the blending space of reducing agent and tail gas；But if only merely shorten blending space without
It takes other to improve the technological means of mixing efficiency, and may result in urea liquid pyrolysis not exclusively, reducing agent and tail gas are mixed
Insufficient, the problems such as catalyst carrier face air-flow is uneven is closed, and eventually leads to line clogging and catalyst life shortens.
Therefore, how in lesser blending space, the degree of pyrolysis and reducing agent and tail gas of urea liquid are improved
Mixing efficiency and mixing uniformity, the technical issues of becoming those skilled in the art's urgent need to resolve.
To solve the above problems, Chinese patent CN105545425A disclose it is a kind of for being supplied to compact mixer
Modularization mixer entrance and mixer assembly.The mixer has upstream end and downstream and mixer entrance sheet
Body.There is the mixer entrance ontology closing end and open end, the open end to be attached to the mixer
The upstream end thereof, the mixer entrance ontology include that the open end is extended to from the closing end around center
The peripheral surface of axis, wherein the peripheral surface includes arrival end, and wherein the closed end portion includes spiral forming
Portion, the spiral forming portion make the exhaust for leaving the ingress port start to carry out vortex movement.The technical solution makes to arrange
Gas forms vortex movement in mixer, and the axial dimension of mixer is reduced under the premise of meeting exhaust flow path.However, should
Technical solution needs special setting one on the mixer to have the inlet body for closing end and open end, although mixer
Body dimension reduce, however but increase inlet part, not only increase the whole axial dimension of mixer, while also increasing
Manufacture and assembly cost are added.Its another defect is to be vented to turn in the spiral forming portion of ingress port and form whirlpool fortune
Dynamic, speed reduces after the turning point is obstructed, and keeps exhaust residence time at this too long, influences mixing efficiency.
Summary of the invention
The present invention is to solve above-mentioned technical problem of the existing technology, it is desirable to provide a kind of close-coupled mixer group
Part is designed by special flow passage structure, and the mixer assembly is not only able in the blending space of very little, increases tail gas
With the mixing distance of reducing agent, and mixed gas can be made to generate complicated rotation and centrifugal movement, so that it is mixed to have reached raising
Close the purpose of efficiency and mixing uniformity.
To solve the above problems, the invention adopts the following technical scheme: a kind of close-coupled mixer assembly, including shell
Body, air inlet drive end bearing bracket and outlet rear end cap positioned at the outer housing both ends, and by the air inlet drive end bearing bracket and outlet rear end
Cover the intermediate mixing chamber limited, it is characterised in that the main part of the air inlet drive end bearing bracket and outlet rear end cap is slab construction,
It is equipped with connection baffle between the two；The intermediate mixing chamber is mixing inner cavity and mixing exocoel by partition radial separations；It is described
Air inlet drive end bearing bracket on offer tail gas air inlet and exocoel gas inlet, offer mixed gas on the outlet rear end cap
Gas outlet and exocoel offgas outlet, the tail gas air inlet and mixed gas gas outlet, which are staggered, is placed in the two of the connection baffle
Side, and be connected to the mixing inner cavity；The exocoel gas inlet and exocoel offgas outlet is staggeredly arranged, and with it is described
Mix exocoel connection；Nozzle mounting base is equipped at the top of the intermediate mixing chamber.
A kind of close-coupled mixer assembly of the invention, tail gas enters intermediate mixing chamber by tail gas air inlet, with injection
The reducing agent of entrance mixes, and the major pollutants after reduction reaction in tail gas reach emission regulation demands, finally from gaseous mixture
The discharge of body gas outlet.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention increases the mixing distance of tail gas and reducing agent, and promote to mix by designing special mixer flow passage structure
It closes gas and generates complicated rotation and centrifugal movement in the mixing chamber of mixer, improve mixing efficiency to reach and be uniformly mixed
The purpose of property.
2, the configuration of the present invention is simple, performance efficiency, be suitable for volume production, can largely reduce the mixed of reducing agent and tail gas
Space is closed, to reduce the volume of exhaust aftertreatment product, this is beneficial to the miniaturization and integrated development that promote product, and
Reach the demand for reducing exhaust aftertreatment product cost to a certain extent.
3, the main part of air inlet drive end bearing bracket of the invention and outlet rear end cap is slab construction, and tail gas is along mixer
The parallel direction of mandrel line enters mixer, and the central axis after being obstructed at the side of connection baffle around mixer rotates one
It is finally discharged from the mixed gas gas outlet of the baffle other side in week.The residence time is long in a mixer for tail gas, not only increases row
Journey, and it is made to be sufficiently mixed and be reacted with reducing agent.
4, mixer is divided into interior exocoel, and the exocoel gas inlet and exocoel offgas outlet are staggeredly arranged, keep away
Exempt from tail gas directly to circulate.Mix exocoel in only high-temperature tail gas flowing, structure space by air inlet drive end bearing bracket, outlet rear end cap,
Partition and outer housing limit.The surface temperature of partition can be improved in high-temperature tail gas, prevents urea liquid from being formed in baffle surface heavy
Product object, blocking channel.
As an improvement of the present invention, the distance between the air inlet drive end bearing bracket and outlet rear end cap are in 50mm~90mm model
In enclosing.
As further improvement of the invention, one group of air inlet and one first are additionally provided on the air inlet drive end bearing bracket
Central through hole is additionally provided with one group of venthole and second central through hole, the air inlet, on the outlet rear end cap
One central through hole, venthole and the second central through hole are connected to the mixing inner cavity；First central through hole and second
Central through hole is coaxial, and equal in magnitude.The air inlet and the first central through hole enters time of mixer assembly as tail gas
The subchannel of channel, the venthole and the second central through hole as mixed gas outflow mixer assembly.It is logical by primary and secondary
Road enters the mixed gas of mixing chamber, and increasingly complex rotation and centrifugal movement are generated in mixing chamber, further increases mixing
Efficiency and mixing uniformity.
As further improvement of the invention, the tail gas air inlet is logical for the master that tail gas enters mixer assembly
Road, opening area are greater than the sum of the area of one group of air inlet and first central through hole；The mixed gas goes out
Port is the main channel that mixed gas flows out mixer assembly, and opening area is greater than in one group of venthole and one second
The sum of the area of heart through-hole.
As further improvement of the invention, the tail gas air inlet, air inlet, the exocoel that are opened up on the air inlet drive end bearing bracket
The sum of gas inlet and the area of the first central through hole are the 20%~30% of the air inlet drive end bearing bracket gross area.
As further improvement of the invention, the mixed gas gas outlet that is opened up on the outlet rear end cap, venthole,
The sum of exocoel offgas outlet and the area of the second central through hole are the 30%~40% of the rear end cap gross area.
The shape of mixer to post-processing the structure design of section it is related, can be it is circular, some box-types or it is U-shaped after
Processor middle transition section may be other shapes.After tail gas air inlet and air inlet and outlet on air inlet drive end bearing bracket
Mixed gas gas outlet and venthole on end cap, shape, position and quantity can according to it is actual simulation and test result into
Row adjustment, velocity uniformity when in favor of improving the mixing efficiency of mixed gas and flow out mixer assembly.Preferentially, described
Mixer assembly be circular configuration；The exocoel gas inlet and exocoel offgas outlet is respectively one, and fan-shaped；It is described
The first central through hole and the second central through hole be circular hole；The air inlet and venthole is multiple circles, arcuate socket, kidney-shaped
Hole or scallop hole, and be staggeredly arranged；The exocoel gas inlet and exocoel offgas outlet is multiple arcs hole.
As further improvement of the invention, described connection baffle one end is intersected with partition, the other end and mixer
Central axis intersection.
As further improvement of the invention, the nozzle mounting base is arranged at the top of intermediate mixing chamber close to tail gas
It at air inlet, is contacted at once with reducing agent after so that tail gas is entered mixer, further increases the mixing of tail gas and reducing agent and anti-
Answer efficiency.The mounting plane of the nozzle mounting base is parallel with mixer center axis；The injection axially bored line of nozzle mounting base with
Connecting the acute angle range that baffle is formed is 30 °~40 °.
As a further improvement of the present invention, lead between the air inlet drive end bearing bracket and outlet rear end cap and connection baffle
Baffle installation keyway location and installation is crossed, keyway location and installation is installed by partition between partition.Preferably, partition peace
Dress keyway and baffle installation keyway may be designed to symmetrical structure, error when preventing from assembling.
Detailed description of the invention
Fig. 1 is the exhaust aftertreatment schematic diagram of product structure of close-coupled mixer assembly embodiment of the present invention；
Fig. 2 is the cross-sectional view of close-coupled mixer assembly embodiment of the present invention；
Fig. 3 is the structural schematic diagram of air inlet drive end bearing bracket of the present invention；
Fig. 4 is the structural schematic diagram of outlet rear end cap of the present invention；
Fig. 5 is the structural schematic diagram that front and rear cover of the present invention connects baffle；
Fig. 6 is present invention mixing inner cavity and the structural schematic diagram for mixing exocoel partition；
Fig. 7 is the structural schematic diagram of outer housing of the present invention.
In figure, 1. air intake assemblies；2.DOC component；3.DPF component；4. mixer assembly；5. heat shield；6.SCR catalyst converter
Component；7. going out pneumatic module；8. nozzle mounting base；9. partition；10. mixing exocoel；11. outer housing；12. connecting baffle；13. tail gas
Air inlet；14. air inlet drive end bearing bracket；15. the first central through hole;16. partition installs keyway；17. air inlet；18. outlet rear end cap；
19. mixing inner cavity；20. the second central through hole；21. central axis；22. venthole；23. exocoel offgas outlet；24. air inlet front end
Lid flange；25. exocoel gas inlet；26. baffle installs keyway；27. outlet rear end cap flange；28. mixed gas gas outlet；
29. nozzle carrier installs avoid holes；30. spray-hole；31. spraying axially bored line；32. nozzle carrier mounting plane；33. intermediate mixing chamber.
Specific embodiment
Fig. 1 shows the exhaust aftertreatment product assembly comprising close-coupled mixer assembly of the present invention.It is main in tail gas
Pollutant includes hydrocarbon (HC), carbon monoxide (CO), particulate matter (PM) and nitrogen oxides (NOx), and tail gas passes through first
Air intake assembly 1 enters aftertreatment products assembly, and under the flow-disturbing orifice plate effect built in air intake assembly 1, tail gas is uniformly through oxidation
Catalyst converter (DOC) component 2, hydrocarbon (HC) and carbon monoxide under the catalyst action of DOC component 2, in tail gas
(CO) oxidation reaction occurs, to remove HC the and CO these two types pollutant in tail gas；Then, tail gas passes through particulate filter
(DPF) component 3 filter off the particulate matter (PM) in tail gas.By the processing of DOC component 2 and DPF component 3, into mixer assembly
4 tail gas needs the major pollutants removed there was only nitrogen oxides (NOx)；Under the action of mixer assembly 4, tail gas with mix
After the reducing agent that 4 upper end spray-hole 30 of device assembly is injected into is sufficiently mixed, into SCR catalyst component 6, in SCR catalyst
Under the catalyst action of component 6, nitrogen oxides (NOx) is chemically reacted with reducing agent, generates harmless nitrogen (N2) and water.
After the effect of DOC component 2, DPF component 3 and SCR catalyst component 6, the major pollutants in tail gas reach emission regulation
It is required that being discharged into atmosphere finally by pneumatic module 7 out.
As illustrated in figs. 2-7, close-coupled mixer assembly of the invention, including outer housing 11, be located at 11 liang of the outer housing
The air inlet drive end bearing bracket 14 and outlet rear end cap 18 at end, and the centre limited by the air inlet drive end bearing bracket 14 and outlet rear end cap 18
Mixing chamber 33.
The shape of mixer is related to the post-processing structure design of section, in the present embodiment, using circular configuration.
Connection baffle 12 and partition 9 are equipped between the air inlet drive end bearing bracket 14 and outlet rear end cap 18.The partition 9 is
The intermediate mixing chamber 33 is divided into mixing inner cavity 19 and mixing exocoel 10 by ring structure.The air inlet drive end bearing bracket 14
On offer 13, one groups of tail gas air inlet air inlet 17, one, first central through hole 15 and one group of exocoel of a larger open
Gas inlet 25；28, one groups of the mixed gas gas outlet outlet an of larger open is offered on the outlet rear end cap 18
22, second central through holes 20 in hole and one group of exocoel offgas outlet 23.The tail gas air inlet 13, air inlet 17, first
Central through hole 15, mixed gas gas outlet 28, venthole 22 and the second central through hole 20 are connected to the mixing inner cavity 19；Institute
The exocoel gas inlet 25 and exocoel offgas outlet 23 stated are connected to mixing exocoel 10；First central through hole 15 and second
Central through hole 20 is coaxial, and equal in magnitude.
By the effect of DOC component 2 and DPF component 3, HC, CO and PM pollutant in tail gas have reached emission regulation and want
It asks, and due to the honeycomb structure of 3 carrier of DOC component 2 and DPF component, the speed into the tail gas of mixer assembly 4 is uniform
Property is more than 95%.Tail gas passes through tail gas air inlet 13, air inlet 17, central through hole 15 and the exocoel tail gas on air inlet drive end bearing bracket 14
Entrance 25 respectively enters mixing inner cavity 19 and the mixing exocoel 10 of intermediate mixing chamber 33.
Specifically, the spatial dimension for mixing inner cavity 19 is limited by air inlet drive end bearing bracket 14, outlet rear end cap 18 and partition 9, greatly
Partial tail gas enters mixing inner cavity 19 by tail gas air inlet 13, air inlet 17 and central through hole 15, and sprays with spray-hole 30
The reducing agent of entrance mixes.The spatial dimension of exocoel 10 is mixed by air inlet drive end bearing bracket 14, outlet rear end cap 18, partition 9 and shell
Body 11 limits, wherein only high-temperature tail gas flows, to improve the surface temperature of partition 9, prevents urea liquid on 9 surface of partition
Form deposit, blocking channel.
Further, mixing the exocoel gas inlet 25 of exocoel 10 and exocoel offgas outlet 23 should be staggeredly arranged, and avoid tail
Gas directly circulates.
Since connection baffle 12 goes out the mixed gas of the tail gas air inlet 13 of air inlet drive end bearing bracket 14 and outlet rear end cap 18
Port 28 separates, and tail gas must rotate with the mixed gas of reducing agent in mixing inner cavity 19 flows out mixer assembly 4 after a week,
This not only increases the mixing distance of tail gas and reducing agent, and due to complicated rotation and centrifugal movement, so that outflow mixing
The flow velocity of the mixed gas of device assembly 4 is more uniform.
As shown in Fig. 2, the distance between air inlet drive end bearing bracket 14 and outlet rear end cap 18 should be within the scope of 50mm~90mm, this
Be conducive to further increase the compactedness of mixer assembly 4, the rotation of enhancing tail gas and reducing agent mixed gas and centrifugal movement,
The back pressure of mixer assembly 4 can also be controlled simultaneously in the reasonable scope, air inlet drive end bearing bracket 14 and outlet rear end cap in embodiment
The distance between 18 be 60mm.
Velocity uniformity when further, as shown in Figure 3 and Figure 4, to guarantee that mixed gas flows out mixer assembly 4,
And the back pressure of mixer assembly 4 can be effectively reduced, the ratio of 14 area of total opening area and air inlet drive end bearing bracket of air inlet drive end bearing bracket 14
Value should be in 20%~30% range, tail gas air inlet 13 in embodiment, air inlet 17, exocoel gas inlet 25 and central through hole 15
The sum of area and the gross area ratio of air inlet drive end bearing bracket 14 be 23%；The opening area and outlet rear end cap of outlet rear end cap 18
The ratio of 18 areas should be in 30%~40% range, mixed gas gas outlet 28 in embodiment, venthole 22, exocoel offgas outlet
23 and the sum of the area of central through hole 20 and the gross area ratio of outlet rear end cap 18 be 37%.
Further, shape, position and the quantity of the venthole 23 of outlet rear end cap 18 should according to it is actual simulation and
Test result adjustment, velocity uniformity when in favor of improving the mixing efficiency of mixed gas and flow out mixer assembly 4.At this
In embodiment, the exocoel gas inlet 25 and exocoel offgas outlet 23 are respectively one, and fan-shaped；In described first
Heart through-hole 15 and the second central through hole 20 are circular hole；The air inlet 17 be multiple circular holes and arcuate socket, and close to tail gas into
Port 13 is distributed；The venthole 22 is multiple scallop holes being radially distributed, and close to the mixed gas gas outlet
28 arrangements；The exocoel gas inlet 25 and exocoel offgas outlet 23 is multiple arcs hole, and circumferentially.
As illustrated in figs. 2-7, partition is used between the air inlet drive end bearing bracket 14 of mixer assembly 4, outlet rear end cap 18 and partition 9
The positioning assembly of keyway 16 is installed；Keyway is installed using baffle between air inlet drive end bearing bracket 14, outlet rear end cap 18 and connection baffle 12
26 positioning assembly.
Further, partition 9, connection baffle 12, partition installation keyway 16 and baffle installation keyway 26 may be designed to symmetrically
Structure, error when preventing from assembling.
Further, connection 12 one end 1201 of baffle is intersected with partition 9, the other end 1202 and mixer center axis 21
Intersection, and connection baffle 12 should be by the mixed gas of the tail gas air inlet 13 of air inlet drive end bearing bracket 14 and outlet rear end cap 18 when assembly
Gas outlet 28 separates, and prevents tail gas from directly circulating.
As shown in fig. 7,11 upper end of outer housing is equipped with the mounting plane 32 of nozzle mounting base 8, nozzle mounting base 8 passes through injection
Hole 30 and nozzle carrier install avoid holes 29, the location and installation on nozzle carrier mounting plane 32.
Further, nozzle carrier mounting plane 32 is parallel with mixer center axis 21, in the present embodiment, mounting plane
32 distances parallel with central axis 21 and between the two are 120mm.
Further, the axis 31 of spray-hole 30 is 30 °~40 ° with the acute angle range for connecting the formation of baffle 12,
In the present embodiment, axis 31 is 35 ° with the acute angle for connecting the formation of baffle 12.
It is understood that above-described embodiment is the description of the invention, it is rather than limiting the invention, any
Without departing from the innovation and creation within the scope of true spirit, fall within the scope of protection of the present invention.
Claims (12)
1. a kind of close-coupled mixer assembly, including outer housing (11), positioned at the air inlet drive end bearing bracket at the outer housing (11) both ends
(14) and outlet rear end cap (18) the intermediate mixing chamber, and by the air inlet drive end bearing bracket (14) and outlet rear end cap (18) limited
(33), it is characterised in that the main part of the air inlet drive end bearing bracket (14) and outlet rear end cap (18) be slab construction, the two it
Between be equipped with connection baffle (12)；The intermediate mixing chamber (33) is mixing inner cavity (19) and is mixed by partition (9) radial separations
Exocoel (10)；Tail gas air inlet (13) and exocoel gas inlet (25) are offered on the air inlet drive end bearing bracket (14), it is described
Mixed gas gas outlet (28) and exocoel offgas outlet (23), the tail gas air inlet are offered on outlet rear end cap (18)
(13) with mixed gas gas outlet (28) be staggered be placed in it is described connection baffle (12) two sides, and with the mixing inner cavity (19)
Connection；The exocoel gas inlet (25) and exocoel offgas outlet (23) is staggeredly arranged, and with the mixing exocoel (10)
Connection；Nozzle mounting base (8) are additionally provided on the intermediate mixing chamber (33).
2. a kind of close-coupled mixer assembly as described in claim 1, it is characterised in that the air inlet drive end bearing bracket (14) and
The distance between outlet rear end cap (18) is within the scope of 50mm~90mm.
3. a kind of close-coupled mixer assembly as described in claim 1, it is characterised in that on the air inlet drive end bearing bracket (14)
It is additionally provided with one group of air inlet (17) and first central through hole (15), one group is additionally provided on the outlet rear end cap (18) and goes out
Stomata (22) and second central through hole (20), the air inlet (17), the first central through hole (15), venthole (22) and
Second central through hole (20) is connected to the mixing inner cavity (19)；First central through hole (15) and the second central through hole
(20) coaxially, and it is equal in magnitude.
4. a kind of close-coupled mixer assembly as claimed in claim 3, it is characterised in that the tail gas air inlet (13) is
Tail gas enters the main channel of mixer assembly (4), and opening area is greater than one group of air inlet (17) and first center
The sum of the area of through-hole (15)；The mixed gas gas outlet (28) is that the master of mixed gas outflow mixer assembly (4) is logical
Road, opening area are greater than the sum of the area of one group of venthole (22) and second central through hole (20).
5. a kind of close-coupled mixer assembly as claimed in claim 4, it is characterised in that opened on the air inlet drive end bearing bracket (14)
If the sum of tail gas air inlet (13), air inlet (17), exocoel gas inlet (25) and the area of the first central through hole (15) be
The 20%~30% of air inlet drive end bearing bracket (14) gross area.
6. a kind of close-coupled mixer assembly as claimed in claim 4, it is characterised in that opened on the outlet rear end cap (18)
If mixed gas gas outlet (28), venthole (22), exocoel offgas outlet (23) and the second central through hole (20) area it
Be the 30%~40% of rear end cap (18) gross area.
7. a kind of close-coupled mixer assembly as claimed in claim 4, it is characterised in that described connection baffle (12) one end
Intersect with partition (9), the other end intersects with mixer center axis (21).
8. a kind of close-coupled mixer assembly as claimed in claim 3, it is characterised in that nozzle mounting base (8) setting
At the top of intermediate mixing chamber (33) at tail gas air inlet (13).
9. a kind of close-coupled mixer assembly as claimed in claim 8, it is characterised in that the nozzle mounting base (8)
Mounting plane (32) it is parallel with mixer center axis (21)；The injection axially bored line (31) of nozzle mounting base (8) with connect gear
The acute angle range that plate (12) is formed is 30 °~40 °.
10. a kind of close-coupled mixer assembly as claimed in claim 3, it is characterised in that the air inlet drive end bearing bracket (14) and
Outlet rear end cap (18) with connect between baffle (12) by baffle install keyway (26) location and installation, between partition (9) lead to
Cross partition installation keyway (16) location and installation.
11. a kind of close-coupled mixer assembly as claimed in claim 10, it is characterised in that the partition installs keyway
(16) and baffle installation keyway (26) is designed to symmetrical structure.
12. a kind of close-coupled mixer assembly as described in claim 3 ~ 11 any one, it is characterised in that the mixing
Device assembly (4) is circular configuration；The exocoel gas inlet (25) and exocoel offgas outlet (23) is respectively one, and in fan
Shape；First central through hole (15) and the second central through hole (20) is circular hole；The air inlet (17) and venthole
(22) it is multiple circles, arcuate socket, kidney slot or scallop hole, and is staggeredly arranged；The exocoel gas inlet (25) and exocoel
Offgas outlet (23) is multiple arcs hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811347912.0A CN109356693B (en) | 2018-11-13 | 2018-11-13 | Compact mixer assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811347912.0A CN109356693B (en) | 2018-11-13 | 2018-11-13 | Compact mixer assembly |
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| CN109356693A true CN109356693A (en) | 2019-02-19 |
| CN109356693B CN109356693B (en) | 2024-01-26 |
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| CN201811347912.0A Active CN109356693B (en) | 2018-11-13 | 2018-11-13 | Compact mixer assembly |
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| CN110173330A (en) * | 2019-07-04 | 2019-08-27 | 浙江银轮机械股份有限公司 | Static mixer and vehicle |
| CN111821921A (en) * | 2020-06-27 | 2020-10-27 | 淮阴工学院 | Air inlet device of chloromethane reaction tower |
| WO2023138506A1 (en) * | 2022-01-18 | 2023-07-27 | 潍柴动力股份有限公司 | Selective catalytic reduction (scr) system and engine |
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| WO2017215458A1 (en) * | 2016-06-13 | 2017-12-21 | 天纳克（苏州）排放***有限公司 | Exhaust gas postprocessing apparatus |
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| CN110173330A (en) * | 2019-07-04 | 2019-08-27 | 浙江银轮机械股份有限公司 | Static mixer and vehicle |
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| WO2023138506A1 (en) * | 2022-01-18 | 2023-07-27 | 潍柴动力股份有限公司 | Selective catalytic reduction (scr) system and engine |
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| Publication number | Publication date |
|---|---|
| CN109356693B (en) | 2024-01-26 |
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