CN208950676U - A kind of SCR reactant and engine exhaust mixing arrangement - Google Patents
A kind of SCR reactant and engine exhaust mixing arrangement Download PDFInfo
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- CN208950676U CN208950676U CN201821165640.8U CN201821165640U CN208950676U CN 208950676 U CN208950676 U CN 208950676U CN 201821165640 U CN201821165640 U CN 201821165640U CN 208950676 U CN208950676 U CN 208950676U
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Abstract
The utility model relates to a kind of SCR reactants and engine exhaust mixing arrangement, including sleeve, reactant nozzle, first mixing chamber, mix runner, first radial partition, second mixing chamber, it is characterized in that, the mixing runner is made of multiple subflow roads, positioned at the sleeve inner, the center line and the sleeve centerline in all subflow roads are substantially parallel, each subflow road is connected in its end by the connecting hole subflow road adjacent with first mixing chamber or one or second mixing chamber, to which exhaust successively enters the second mixing chamber from the first mixing chamber behind each subflow road, exhaust flow direction in subflow road, some along sleeve centerline forward direction, some is along the reversed of sleeve centerline.
Description
Technical field
The utility model belongs to engine exhaust post-processing technology field, and in particular to engine exhaust selective reduction
(SCR) mixing arrangement of the reducing agent and engine exhaust of technology.
Background technique
With becoming increasingly conspicuous for environmental problem, energy-saving and emission-reduction have become the endless requirement of vehicle and engine,
For this purpose, each state has all put into effect a series of vehicular emission standards, and it is increasingly stringenter.In this regard, using internal combustion engine as the vehicle of power
Need to install discharge post-treatment system in the hope of meeting emission request.For example, being currently used primarily in in diesel motor exhaust
NOxSCR (Selective Catalytic Reduction) technology etc. that equal pollutants carry out catalytic treatment has become diesel oil
The technology that vehicle etc. must use.
SCR technology is needed NOxReduction reaction agent metered injection is into diesel exhaust gas, into SCR after mix with exhaust
Catalyst.Reducing agent has the aqueous solution of urea of 32.5% weight concentration (to be also diesel exhaust gas treatment fluid DEF=Diesel
Exhaust Fluid perhaps adds blue liquid AdBlue) or ammonia.The ammonia that DEF is decomposited in exhaust by exhaust high temperature,
Or the gaseous state ammonia directly ejected, SCR catalyst is entered after mixing with engine exhaust, under the effect of the catalyst,
Ammonia will be with the NO in engine exhaustxDeng generation catalytic reduction reaction, make NOxIt is decomposed into harmless N2、H2O.If reduction
Reactant can not uniformly be mixed with exhaust, then ammonia and NO in SCR catalystxRatio (ammonia nitrogen ratio) will be very uneven,
As a result partially catalyzed device unit might have extra ammonia and be leaked in tail gas, and partially catalyzed device unit is in default of ammonia
And it is difficult to make NOxEffectively degraded.
On the other hand, after the DEF of liquid is ejected into the exhaust pipe of engine, if can not fast pyrogenation be ammonia and with row
Gas be uniformly mixed, then probably due to other physicochemical changes and become solid-state junction crystal and remain in exhaust pipe, for a long time product
It is tired to block the exhaust pipe of engine, make engine performance severe exacerbation.
Crystallization of the DEF in exhaust pipe, is influenced by many factors, most importantly temperature and two phase flow speed.
Temperature determines chemical reaction product, and flowing velocity determines whether the solid-state junction crystal in product can be accumulated in inside pipeline.
Existing SCR technology will be such that the reactant sprayed is uniformly mixed with engine exhaust by every means, adopt thus
SCR system is helped with the gas of compressed air atomized spray DEF, also the non-gas of reliable pressure injection atomization DEF helps SCR system,
There is the solid-state ammonia SCR system of directly injection ammonia.But due to the limitation of structure size, accomplish the mixed uniformly scheme of absolute ideal
It is not present, is especially the SCR system that non-gas helps, spray particle diameter is larger, and spraying distribution has the characteristic of oneself again, needs to design
Special mixing arrangement prevents from crystallizing and realizing uniformly mixed.Such as the scheme having is deliberately exhaust pipe bending, in pipe bent position
DEF nozzle is installed, and mixer is set, liquid spray is ejected on mixer first.But this brings limit to exhaust pipe arrangement
System, exhaust pipe manufacturing cost also will increase.If being mounted directly DEF nozzle on the exhaust pipe of straight tube, can only be necessarily: or
Angular injection is difficult to uniform directive mixer by spraying, and as a result crystallizing risk just will increase, and ammonia nitrogen is also more relatively low than the uniformity；
Nozzle is deep near exhaust pipe inside center, but this will lead to the nozzle inside exhaust pipe and is heated seriously, no
Only nozzle is easily damaged, and structure complicates, and more crucially also likely results in nozzle interior when reactant is DEF
DEF dries out too early and generates urea crystals, plug nozzle.
In order to guarantee urea solution rapid evaporation and be pyrolyzed to be effective NOxReducing gas --- ammonia, while under entrance
Consistent, the necessary long enough in mixed flow path is uniformly mixed when the SCR catalyst of trip, to mention for urea solution evaporation pyrolysis mixing
For time enough and space, the length for the catalyst converter to be increased that is bound in this way carries catalyst converter onboard by bulk
Limitation, it is difficult to arrange.Especially it is increasingly stringenter including diesel oxidation catalyst (DOC), exhaust particulate in emission regulation
Under the premise of catalyst converter including filter (DPF) and SCR catalyst is more and more, catalyst converter package dimension problem is increasingly
It is prominent.So how in space as small as possible and scale to realize that urea solution and ammonia are mixed with the uniform of engine exhaust,
It is a great problem of engine exhaust aftertreatment system design.
Summary of the invention
The utility model in view of the above-mentioned problems, be designed to provide one kind in catalyst converter axial space as short as possible
It realizes that the SCR that reactant is uniformly mixed with exhaust is vented mixing arrangement, improves the adaptability that catalyst converter carries arrangement to vehicle, and
Reduce total system cost.
In order to achieve the above objectives, the technical solution adopted in the utility model is: a kind of SCR reactant and engine exhaust are mixed
It attaches together and sets, including sleeve, reactant nozzle, the first mixing chamber, mixing runner, the first radial partition, the second mixing chamber, feature
It is, mixing runner is made of multiple subflow roads, is located at sleeve inner, and the center line and sleeve centerline in subflow road are substantially flat
Row, each subflow road pass through connecting hole and the first mixing chamber or adjacent a subflow road or the second mixing chamber in its end
Connection, so that exhaust successively enters the second mixing chamber from the first mixing chamber behind each subflow road, the exhaust in subflow road
Flow direction, some is along the forward direction of sleeve centerline, and some is along the reversed of sleeve centerline.
According to the above technical scheme, the DEF urea solution of runner is spraying and the mixed path of engine exhaust by mixing, closely
It is similar to the broken line (serpentine) around sleeve centerline, therefore path length is longer, is conducive to before reaching SCR catalyst, completely
Evaporation is pyrolyzed and is uniformly mixed.On the other hand, since mixed path global approximation is in carrying out circumferential movement around sleeve centerline, subtract
Lack the axial length of mixing chamber, and then reduced the axial length of entire exhaust mixing arrangement, is conducive to arrangement.It sprays
Urea liquid mist is entering initial collision solid wall surface near mixing runner, the company being connected to due to sub- flow passage ends with the first mixing chamber
It is small to connect hole area, exhaust flow rate is big herein, therefore is mixed to get reinforcement, and the drop for not evaporating pyrolysis is also difficult to be detained generation knot
It is brilliant.DEF and exhaust mixed flow enter the second mixing chamber in quickly mixing evaporation process, because diffusion makes speed be lower, but logical
It can accelerate again when crossing diffusion mixed plate, overall flow is substantially unobstructed, therefore generates a possibility that mass crystallization blocks runner and also compare
It is smaller.
After DEF is heated by engine exhaust, can dry out precipitated urea crystalline particle first, but if temperature is enough
Height is higher than the gasification temperature of urea, is then not in urea crystals particle and is directly becoming gaseous state urea.High temperature urea and water
Vapor reaction will be pyrolyzed to form ammonia.Meanwhile urea also will do it other chemical reactions, generate biuret, cyanuric acid, three
The crystalline solid such as poly cyanamid, but the speed of these reactions is slower than the speed that urea pyrolysis is ammonia, does not contact in DEF compared with low temperature
When spending solid wall surface, crystalline solid will not be accumulated.When two-phase flow speed is sufficiently large, crystalline solid can be with exhaust stream being formed
It walks, will not accumulate.
Following technical solution, is further limited the utility model or optimizes.
Optionally, the entrance partition being arranged between subflow road and the first mixing chamber constitutes the entrance end edge in all subflow roads
Boundary, the entrance that exhaust enters subflow road is provided on entrance partition, and the top most amphi position apart from sub- flow channel entry point is arranged in nozzle
It sets, the reactant of nozzle injection is mixed by longest free space with engine exhaust, and subflow road is then accelerated into
Further mixing.
Optionally, the umbrella jet stream that nozzle sprays, axis are angled perpendicular to sleeve axis, or with sleeve axis
Making the intersection location of jet axis and lower cartridge wall surface, close to sub- flow channel entry point then part streams first collide entrance partition
Into subflow road, part streams be directly entered subflow road or with after lower cartridge collision with wall enter subflow road.
Optionally, in the exhaust stream incoming flow side of nozzle, a jet stream reflecting plate, the umbrella jet stream that nozzle sprays are provided with
In, the part streams impacting jet reflecting plate first for being biased to exhaust incoming flow side changes stream rearwardly towards sub- flow channel entry point.
Optionally, the outlet partition plate being arranged between subflow road and second mixing chamber constitutes the outlet end in all subflow roads
Boundary, the outlet in exhaust outflow subflow road is provided on outlet partition plate, and the exhaust of the second mixing chamber described in the export mixes enters
Mouthful, SCR catalyst is set in the downstream of the second mixing chamber, SCR reactant and engine exhaust are further mixed in the second mixing chamber
Distribution is closed, even into the SCR catalyst.
Optionally, subflow road shares 3, and wherein final stage subflow road is a small cylinder coaxial with sleeve, final stage subflow road
Outlet be the second mixing chamber exhaust entrance, first and second sub- runner is by sleeve lining faces, final stage subflow
The space runner that road outer surface and two radial partitions being arranged between sleeve lining and final stage subflow pipeline outer wall define, first
A sub- runner passes through the lateral communication hole being arranged on the first radial partition near outlet partition plate and is connected to second sub- runner,
Second sub- runner passes through the radial communication hole being arranged on the cylindrical surface in final stage subflow road and final stage near entrance partition
Runner connection.
Optionally, subflow road shares 5, and wherein final stage subflow road is a small cylinder coaxial with sleeve, final stage subflow road
Outlet be the second mixing chamber exhaust entrance, first to the 4th sub- runner is by sleeve lining face, final stage subflow
The space runner that road circle outer surface and the radial partition being arranged between sleeve lining and final stage subflow pipeline outer wall define, first
Subflow road passes through the lateral communication hole being arranged on the first radial partition near outlet partition plate and is connected to second sub- runner, the
Two sub- runners pass through the lateral communication hole being arranged on the second radial partition near import partition and the sub- runner of third connects
Logical, the sub- runner of third passes through the lateral communication hole being arranged on third radial direction partition and the 4th son near outlet partition plate again
Runner connection, the 4th sub- runner pass through the radial communication being arranged on the cylindrical surface in final stage subflow road near entrance partition again
Hole is connected to final stage subflow road.
Optionally, subflow road shares 3, and three sub- runners are crossed to form a common boundary in sleeve centerline, serves as reasons
The space runner that sleeve lining face and three radial partitions being arranged between sleeve lining and sleeve centerline define, first
The entrance in subflow road is the sub- flow channel entry point being connected to the first mixing chamber, pass through near outlet partition plate setting first it is radial every
Circumferential intercommunicating pore on plate is connected to first sub- runner with second sub- runner, and second sub- runner leads near entrance partition
It crosses and the circumferential intercommunicating pore of second partition is set be connected to third sub- runner, a sub- runner of third is final stage subflow road,
Outlet is the entrance of the second mixing chamber.
Optionally, three radial partitions are spiral torsional bent plate, so that the inlet area of first sub- runner of composition is greater than
The one third of sleeve cross-sectional area, and the discharge area of the sub- runner of third formed is also greater than three points of sleeve cross-sectional area
One of, exhaust air flow channels streamwise in first sub- runner is smaller and smaller, so that flow velocity is higher and higher, and in third
Streamwise is increasing in a sub- runner, so that velocity flow profile is more uniform after entering the second mixing chamber.
Optionally, subflow road shares 3, wherein the second subflow road is a small cylinder inner space stream coaxial with sleeve
Road, the first subflow road and final stage subflow road are by sleeve lining face, the second subflow road outer surface and setting in sleeve lining and the
The space runner that two partitions between two subflow pipeline outer walls define, the first subflow road pass through setting the near outlet partition plate
Lateral communication hole on the two small cylinders in subflow road is connected to the second subflow road, and the second subflow road passes through setting near entrance partition
Radial communication hole on cylindrical surface is connected to final stage subflow road, and the outlet in final stage subflow road is the exhaust of the second mixing chamber
Entrance.
Optionally, two partitions between sleeve lining and the second subflow pipeline outer wall are to have certain angle with sleeve axis
The surface plate of α, the first subflow road circulation area streamwise final stage subflow that is smaller and smaller, and being defined by it defined by it
Road circulation area streamwise is increasing.
Optionally, it is provided with a diffusion mixed plate in the second mixing chamber, is dispersed with density or size thereon not
Same diffusion hole, sub- runner exit are directly designed against the diffusion hole at position relative to the diffusion hole far from subflow road exit site
It must be smaller or than sparse.
Since above-mentioned technical proposal is used, the utility model is had the advantage that compared with prior art using structure
When the simple convenient straight barrel type of mounting arrangements is vented mixing tube, shorten exhaust system overall size, reduces knot in the exhaust pipe of engine
Brilliant risk improves reactant and exhaust mixture homogeneity, while can reduce SCR system cost.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the utility model first embodiment.
Fig. 2 is a kind of positive schematic diagram of mixing runner of the utility model first embodiment.
Fig. 3 is a kind of positive schematic diagram of mixing runner of the utility model first embodiment.
Fig. 4 is a kind of backward schematic diagram of mixing runner of the utility model first embodiment.
Fig. 5 is a kind of positive schematic diagram of mixing runner of the utility model second embodiment.
Fig. 6 is a kind of backward schematic diagram of mixing runner of the utility model second embodiment.
Fig. 7 is the cross-sectional view of the utility model 3rd embodiment.
Fig. 8 is a kind of structural schematic diagram of mixing runner of the utility model 3rd embodiment.
Fig. 9 is a kind of structural schematic diagram of mixing runner of the utility model fourth embodiment.
Figure 10 is a kind of structural schematic diagram of mixing runner of the 5th embodiment of the utility model.
Figure 11 is a kind of side view of mixing runner of the utility model sixth embodiment.
In figure: 11 being sleeve, 12 be umbrella jet stream, 13 be jet stream reflecting plate, 14 be reactant nozzle, 15 be mixed flow
Road, 16 for the second mixing chamber, 17 be the first mixing chamber, 18 be entrance partition, 19 be outlet partition plate, 20 be diffusion mixed plate.
21 for the first radial partition, 22 it is sub- flow channel entry point, 23 be sub- runner exit, 24 be final stage subflow road, 25 is the
One sub- runner, 26 be lateral communication hole, 261 be second lateral communication hole, 27 be radial partition, 28 be second subflow
Road, 29 are radial communication hole.
31 be first sub- runner, 32 be the first radial partition, 33 be lateral communication hole, 34 be second sub- runner, 35
It is lateral communication hole for the second radial partition, 36,37 be the sub- runner of third, 38 be third radial direction partition, 39 is lateral communication
Hole, 40 be the 4th sub- runner, 41 be radial communication hole, 42 be the sub- runner exit of final stage, 43 be final stage subflow road.
51 it is entrance partition, 52 be outlet partition plate, 53 be sub- flow channel entry point, 54 be first sub- runner, 55 is the first diameter
To partition, 56 be circumferential intercommunicating pore, 57 be sub- flow channel entry point, 58 be second partition, 59 be circumferential intercommunicating pore, 60 be third height
Runner.
61 be first sub- runner, 62 be the sub- runner of third.
71 it is entrance partition, 72 be the first subflow road, 73 be outlet partition plate, 74 be lateral communication hole, 75 is the second subflow
Road, 76 be radial communication hole, 77 be final stage subflow road.
Specific embodiment
The utility model preferred embodiment is described in detail below in conjunction with attached drawing:
It is as Figure 1-Figure 4: the diesel SCR reactant of the utility model and the first reality of engine exhaust mixing arrangement
Example is applied, including sleeve 11, reactant nozzle 14, the first mixing chamber 17, the radial partition 21, second of mixing runner 15, first mix
Room 16.
Reactant nozzle 14 is mounted in the first mixing chamber 17, and the umbrella jet stream that reactant nozzle 14 sprays is in engines tail
Mixing is evaporated in gas air-flow, is entered in mixing runner 15 by the sub- flow channel entry point 22 being arranged on entrance partition 18 and is further steamed
Clouding closes.
Mixing runner 15 is made of multiple subflow roads, is located inside sleeve 11, the center line and sleeve 11 in all subflow roads
Center line is substantially parallel, and each subflow road passes through connecting hole and the first mixing chamber 17 or an adjacent subflow road in its end
Or second mixing chamber 16 be connected to, thus exhaust from the first mixing chamber 17 successively behind each subflow road enter second mixing
Room 16, the exhaust flow direction in subflow road, for some along the forward direction of 11 center line of sleeve, some is anti-along 11 center line of sleeve
To.
The entrance partition 18 being arranged between subflow road and the first mixing chamber 17 constitutes the arrival end boundary in all subflow roads,
The entrance 22 that exhaust enters subflow road is provided on entrance partition 18, nozzle 14 is arranged farthest apart from sub- 22 top of flow channel entry point
Position, the reactant that nozzle 14 sprays are mixed by longest free space with engine exhaust, and son is then accelerated into
Runner further mixes.
The umbrella jet stream 12 that nozzle 14 sprays, axis is perpendicular to 11 axis of sleeve, or with 11 axis of sleeve at certain angle
Degree makes the intersection location of jet axis and 11 lower part wall surface of sleeve, and close to sub- flow channel entry point 22, part streams Q1 first collides entrance
For partition 18 subsequently into subflow road, part streams Q2 is directly entered sub- flow path or sub with entering after lower cartridge collision with wall
Runner.
In 14 exhaust stream incoming flow side of nozzle, it is provided with a jet stream reflecting plate 13, the umbrella jet stream 12 that nozzle 14 sprays
In, the part streams Q3 impacting jet reflecting plate first for being biased to exhaust incoming flow side changes stream rearwardly towards sub- flow channel entry point 22
The outlet partition plate 19 of 16 settings constitutes the outlet end boundary in subflow road between subflow road and the second mixing chamber, exports
It is provided with the outlet 23 in exhaust outflow subflow road on partition 19, the export mixes exhaust entrance of the second mixing chamber 16, second
It is provided with a diffusion mixed plate 20 in mixing chamber 16, is dispersed with density or diffusion hole of different sizes, subflow road thereon
Outlet 23 is directly designed smaller relative to the diffusion hole far from subflow road exit site against the diffusion hole at position or compares
It is sparse.Increase the mixing velocity into the gaseous mixture of the second mixing chamber 16 again.In the downstream of the second mixing chamber 16, SCR is set
Catalyst converter, SCR reactant and engine exhaust are in the further mixed distribution of the second mixing chamber 16, even into SCR catalyst.
In the utility model first embodiment, subflow road shares 3, and wherein final stage subflow road 24 is one same with sleeve 11
The small cylinder of axis, the outlet in final stage subflow road 24 are the entrance of the exhaust of the second mixing chamber 16, first sub- runner 25 and the
Two sub- runners 28 are by 11 inner wall of sleeve, 24 outer surface of final stage subflow road and to be arranged in 11 inner wall of sleeve and final stage subflow road
The space runner that radial partition between 24 outer walls defines, first sub- runner 25 is near outlet partition plate 19 by setting the
Lateral communication hole 26 on one radial partition 21 is connected to second sub- runner 28, and second sub- runner 28 is in entrance partition 18
Nearby it is connected to by the radial communication hole 29 being arranged on the cylindrical surface in final stage subflow road 24 with final stage subflow road 24.
In above-mentioned first embodiment, as shown in figure 3, second lateral communication hole can also be arranged on radial partition 27
261, two-way can be divided into second sub- runner 28 into the exhaust stream of first sub- runner 25 in this way, and in second son
Converge in runner 28 and enters back into final stage subflow road 24.
The urea solution that reactant nozzle 14 sprays is spraying, and sub- flow channel entry point, gas will be flow to along motor exhaust air-flow
Stream and mixing evaporation rate can gradually be accelerated, and reach a peak value by mixing velocity when flow channel entrance 22, into mixing
Runner 15 enters second sub- runner 28 after through the lateral communication hole 26 on the first radial partition 21, at this time the fortune of air-flow
Dynamic direction changes, and due to the area very little in lateral communication hole 26, the movement velocity of air-flow here is accelerated.Into second
Behind subflow road 28, final stage subflow road 24 is entered by the radial communication hole 29 being arranged on 24 cylindrical surface of final stage subflow road, sufficiently
Enter in the second mixing chamber 16 after mixing.Gaseous mixture motion path is the compound motion around sleeve circumferential and axial, extends mixing
Path lengthens incorporation time and simultaneously repeatedly enhances mixing velocity, to ensure that finally enter SCR catalyst is urea pyrolysis
The ammonia of formation and the homogeneous mixture of engine exhaust.
The mixing runner of the utility model can also be as shown in Fig. 5-Fig. 6, and second so as to form the utility model is real
Apply example.In a second embodiment, subflow road shares 5, and wherein final stage subflow road 43 is a small cylinder coaxial with sleeve 11, end
The outlet in grade subflow road 43 is the exhaust entrance of the second mixing chamber 16, and first sub- runner 31 is to the 4th sub- runner 40
11 inner wall of sleeve, the circle outer surface of final stage subflow road 43 and setting are in 11 inner wall of sleeve and the circle outer surface of final stage subflow road 43 and set
The space runner that the radial partition between 43 outer wall of 11 inner wall of sleeve and final stage subflow road defines is set, first sub- runner 31 exists
Outlet partition plate 19 is nearby connected to by the lateral communication hole 33 being arranged on the first radial partition 32 with second sub- runner 34, the
Two sub- runners 34 are near import partition 18 by the way that 35 lateral communication hole 36 and third on the second radial partition is arranged in
Subflow road 37 is connected to, and the sub- runner 37 of third is again lateral on third radial direction partition 38 by being arranged near outlet partition plate 19
Intercommunicating pore 39 is connected to the 4th sub- runner 40, and the 4th sub- runner 40 is again sub in final stage by setting near entrance partition 18
Radial communication hole 41 on the cylindrical surface of runner 43 is connected to final stage subflow road 43.
Urea solution and motor exhaust gaseous mixture so successively passes through first to fourth subflow road, into next subflow road
When, gaseous mixture and import partition 18 or the collision of outlet partition plate 19 change flow direction, and the movement of exhaust stream is around exhaust pipe axis
Circumferential flow and the axial movement identical or opposite with exhaust pipe axis synthesis.The increase of subflow road number makes gaseous mixture in axis
Upward motion path increases, and mixed path further strengthens.Since the area in lateral communication hole is much smaller than the face of radial partition
Product, flow velocity increases air-flow here, and mixing velocity is strengthened, and mixed effect is increased.Gaseous mixture in 4th sub- runner 40
Enter final stage subflow road 43 by the radial communication hole 41 being arranged on 43 cylindrical surface of final stage subflow road, further after mixing evaporation
Into the second mixing chamber 16.
According to same principle, flow channel length, such as son can be increased by way of further increasing subflow road number
Runner number can be 7,9, etc..
The mixing runner of the utility model can also as shown in Figs. 7-8, to form 3rd embodiment.3rd embodiment
In, subflow road shares 3, and three sub- runners are crossed to form a common boundary in 11 center line of sleeve, for by 11 inner wall of sleeve
The space runner that face and three radial partitions being arranged between 11 center line of 11 inner wall of sleeve and sleeve define, first subflow
The entrance in road 54 is the sub- flow channel entry point 53 being connected to the first mixing chamber 17, by being arranged in the first diameter near outlet partition plate 52
Circumferential intercommunicating pore 56 on partition 55 is connected to first sub- runner 54 with second sub- runner 57, and second sub- runner 57 exists
Entrance partition 51 is nearby connected to by the way that the circumferential intercommunicating pore 59 of second partition 58 is arranged in the sub- runner 60 of third, third height
Runner 60 is final stage subflow road, and outlet is the entrance of the second mixing chamber 16.
The mixing runner of the utility model can also be as shown in figure 9, so that form fourth embodiment.Three radial partitions are
The inlet area of spiral torsional bent plate, the sub- runner 61 of first of composition is greater than the one third of 11 cross-sectional area of sleeve, and forms
Third sub- runner 62 discharge area also greater than the one third of 11 cross-sectional area of sleeve, exhaust air flow channels are at first
Streamwise is smaller and smaller in subflow road 61, and flow velocity is higher and higher, and streamwise is more next in the sub- runner 62 of third
Bigger, velocity flow profile is more uniform after entering the second mixing chamber 16.
The mixing runner of the utility model can also be as shown in Figure 10, to form the 5th embodiment.Subflow road shares 3
It is a, wherein the second subflow road 75 is a small cylinder inner space runner coaxial with sleeve, the first subflow road 72 and final stage subflow
Road 77 is by 11 inner wall of sleeve, 75 outer surface of the second subflow road and to be arranged between 11 inner wall of sleeve and the second subflow pipeline outer wall
The space runner that defines of two partitions 78, the first subflow road 72 is near outlet partition plate 73 by being arranged in the second subflow road
Lateral communication hole 74 on 75 small cylinders is connected to the second subflow road 75, and the second subflow road 75 is near entrance partition 71 by setting
The radial communication hole 76 set on cylindrical surface is connected to final stage subflow road 77, and the outlet in final stage subflow road 77 is described second mixed
Close the entrance of the exhaust of room 16.
The mixing runner of the utility model can also be as shown in figure 11, to form sixth embodiment.It is arranged in sleeve 11
Two partitions 82 between 83 outer wall of inner wall and the second subflow road are the surface plate for having certain angle α with 11 axis of sleeve, by it
81 circulation area streamwise 84 circulation area of final stage subflow road that is smaller and smaller, and being defined by it of the first subflow road defined
Streamwise is increasing.Angle α can be an angle within 30 °.
The above embodiments are only for explaining the technical ideas and features of the present invention, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, do not limit the protection scope of the present invention,
All equivalent change or modifications according to made by the spirit of the present invention essence, should all cover the protection scope of the utility model it
It is interior.
Claims (12)
1. a kind of SCR reactant and engine exhaust mixing arrangement, including sleeve (11), reactant nozzle (14), the first mixing
Room (17), mixing runner (15), the first radial partition (21), the second mixing chamber (16), which is characterized in that the mixing runner
(15) it is made of multiple subflow roads, it is internal positioned at the sleeve (11), in the center line in the subflow road and the sleeve (11)
Heart line is substantially parallel, and each subflow road passes through connecting hole and first mixing chamber (17) or an adjacent son in its end
Runner or second mixing chamber (16) connection, so that exhaust is from the first mixing chamber (17) successively behind each subflow road
Into the second mixing chamber (16), the exhaust in subflow road is flowed to, and some is along the forward direction of sleeve (11) center line, and some is along set
Cylinder (11) center line it is reversed.
2. SCR reactant as described in claim 1 and engine exhaust mixing arrangement, it is characterised in that: the subflow road with
The entrance partition (18) that is arranged between first mixing chamber (17) constitutes the arrival end boundary in all subflow roads, the entrance every
The entrance (22) that exhaust enters subflow road is provided on plate (18), the nozzle (14) is arranged apart from sub- flow channel entry point (22)
The reactant of top highest distance position, nozzle (14) injection is mixed by longest free space with engine exhaust, then
The subflow road is accelerated into further to mix.
3. SCR reactant as claimed in claim 2 and engine exhaust mixing arrangement, it is characterised in that: the nozzle (14)
The umbrella jet stream (12) of ejection, axis is perpendicular to the sleeve (11) axis, or with the sleeve (11) axis at certain angle
Degree makes the intersection location of jet axis and the sleeve (11) lower part wall surface close to the sub- flow channel entry point (22), part streams Q1
The entrance partition (18) is first collided subsequently into subflow road, part streams Q2 be directly entered subflow road or with the sleeve
(11) enter subflow road after the collision with wall of lower part.
4. SCR reactant as claimed in claim 3 and engine exhaust mixing arrangement, it is characterised in that: in the nozzle
(14) exhaust stream incoming flow side is provided with a jet stream reflecting plate (13), the umbrella jet stream (12) that the nozzle (14) sprays
In, the part streams Q3 for being biased to exhaust incoming flow side collides the jet stream reflecting plate (13) first and changes stream rearwardly towards the son
Flow channel entry point (22).
5. SCR reactant as claimed in claim 2 and engine exhaust mixing arrangement, it is characterised in that: the subflow road with
The outlet partition plate (19) that is arranged between second mixing chamber (16) constitutes the outlet end boundary in all subflow roads, the outlet every
The outlet (23) in exhaust outflow subflow road is provided on plate (19), the exhaust of the second mixing chamber (16) described in the export mixes enters
Mouthful, it is mixed described second that SCR catalyst, SCR reactant and engine exhaust are set in the downstream of second mixing chamber (16)
Room (16) further mixed distribution is closed, even into the SCR catalyst.
6. SCR reactant as claimed in claim 5 and engine exhaust mixing arrangement, it is characterised in that: the subflow road is total
There are 3, wherein final stage subflow road (24) are a small cylinder coaxial with the sleeve (11), and the outlet in final stage subflow road (24) is
For the entrance of the exhaust of second mixing chamber (16), first sub- runner (25) and second sub- runner (28) are by the set
Cylinder (11) inner wall, final stage subflow road (24) outer surface and setting are in the sleeve (11) inner wall and final stage subflow road (24) outer wall
Between the space runner that defines of two radial partitions, first sub- runner (25) is in the outlet partition plate (19) nearby by setting
The lateral communication hole (26) set on the first radial partition (21) is connected to second sub- runner (28), second sub- runner (28)
Nearby pass through the radial communication hole (29) being arranged on the cylindrical surface in final stage subflow road (24) and end in the entrance partition (18)
Grade subflow road (24) is connected to.
7. SCR reactant as claimed in claim 5 and engine exhaust mixing arrangement, it is characterised in that: the subflow road is total
There are 5, wherein final stage subflow road (43) are a small cylinder coaxial with the sleeve (11), and the sub- runner exit of final stage (42) is
The entrance of the exhaust of second mixing chamber (16), first sub- runner (31) to the 4th sub- runner (40) is by the sleeve
(11) inner wall, final stage subflow road (43) circle outer surface and setting are in the sleeve (11) inner wall and final stage subflow road (43) outer wall
Between the space runner that defines of radial partition, first sub- runner (31) nearby existed by setting in the outlet partition plate (19)
Lateral communication hole (33) on first radial partition (32) is connected to second sub- runner (34), and second sub- runner (34) is in institute
State lateral communication hole (36) and third sub- runner of the entrance partition (18) nearby by setting on the second radial partition (35)
(37) it is connected to, the sub- runner (37) of third is again in the outlet partition plate (19) nearby by being arranged on third radial direction partition (38)
Lateral communication hole (39) be connected to the 4th sub- runner (40), the 4th sub- runner (40) is again attached in the entrance partition (18)
The nearly radial communication hole (41) by being arranged on the cylindrical surface in final stage subflow road (43) is connected to final stage subflow road (43).
8. SCR reactant as claimed in claim 5 and engine exhaust mixing arrangement, it is characterised in that: the subflow road is total
There are 3, three sub- runners are crossed to form a common boundary in the sleeve (11) center line, for by the sleeve (11) inner wall
The space runner that face and three radial partitions being arranged between the sleeve lining and sleeve centerline define, first subflow
The entrance in road (54) is the sub- flow channel entry point (53) being connected to the first mixing chamber (17), is nearby passed through in the outlet partition plate (52)
The circumferential intercommunicating pore (56) being arranged on the first radial partition (55) makes first sub- runner (54) and second sub- runner (57)
Connection, second sub- runner (57) is in the entrance partition (51) nearby by the way that the circumferential intercommunicating pore in second partition (58) is arranged
(59) it is connected to the sub- runner (60) of third, the sub- runner (60) of third is final stage subflow road, and outlet is the second mixing
The entrance of room (16).
9. SCR reactant as claimed in claim 8 and engine exhaust mixing arrangement, it is characterised in that: three radial directions
Partition is spiral torsional bent plate, so that the inlet area of first sub- runner (61) of composition is greater than the sleeve (11) cross-sectional area
One third, and the discharge area of the third sub- runner (62) formed is also greater than three points of the sleeve (11) cross-sectional area
One of, exhaust air flow channels are smaller and smaller in first interior streamwise of sub- runner (61), so that flow velocity is higher and higher, and
The interior streamwise of the sub- runner (62) of third is increasing, so that velocity flow profile is more equal afterwards entering the second mixing chamber (16)
It is even.
10. SCR reactant as claimed in claim 5 and engine exhaust mixing arrangement, it is characterised in that: the subflow road
3 are shared, wherein the second subflow road (75) is a small cylinder inner space runner coaxial with the sleeve (11), the first subflow
Road (72) and final stage subflow road (77) are by the sleeve (11) inner wall, the second subflow road (75) outer surface and to be arranged described
The space runner that two partitions (78) between sleeve (11) inner wall and second subflow road (75) outer wall are defined, the first subflow road
(72) the outlet partition plate (73) nearby by be arranged lateral communication hole (74) on second subflow road (75) small cylinder with
The connection of second subflow road (75), the second subflow road (75) nearby pass through the diameter being arranged on cylindrical surface in the entrance partition (71)
It is connected to intercommunicating pore (76) with final stage subflow road (77), the outlet in final stage subflow road (77) is second mixing chamber (16)
The entrance of exhaust.
11. SCR reactant as claimed in claim 10 and engine exhaust mixing arrangement, it is characterised in that: it is arranged described
Two partitions (82) between sleeve (11) inner wall and second subflow road (83) outer wall are to have centainly with the sleeve (11) axis
The surface plate of angle α, first subflow road (81) the circulation area streamwise defined by it is smaller and smaller, and defined by it
Final stage subflow road (84) circulation area streamwise is increasing.
12. SCR reactant and engine exhaust mixing arrangement as described in claim 1 to 11 is any, it is characterised in that:
It is provided with a diffusion mixed plate (20) in second mixing chamber (16), is dispersed with density or expansion of different sizes thereon
Hole is dissipated, the sub- runner exit is directly designed against the diffusion hole at position relative to the diffusion hole far from subflow road exit site
It is smaller or than sparse.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108757127A (en) * | 2018-07-23 | 2018-11-06 | 无锡恒和环保科技有限公司 | A kind of SCR reactants and engine exhaust mixing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757127A (en) * | 2018-07-23 | 2018-11-06 | 无锡恒和环保科技有限公司 | A kind of SCR reactants and engine exhaust mixing arrangement |
| CN108757127B (en) * | 2018-07-23 | 2024-05-31 | 无锡恒和环保科技有限公司 | SCR reactant and engine exhaust mixing arrangement |
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