CN113339111A - Urea-SCR mixer of diesel internal combustion engine post-treatment system - Google Patents
Urea-SCR mixer of diesel internal combustion engine post-treatment system Download PDFInfo
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- CN113339111A CN113339111A CN202110640985.4A CN202110640985A CN113339111A CN 113339111 A CN113339111 A CN 113339111A CN 202110640985 A CN202110640985 A CN 202110640985A CN 113339111 A CN113339111 A CN 113339111A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 239000004202 carbamide Substances 0.000 claims abstract description 57
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 14
- 239000007864 aqueous solution Substances 0.000 abstract description 14
- 229910021529 ammonia Inorganic materials 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000000889 atomisation Methods 0.000 abstract description 3
- 238000000197 pyrolysis Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 37
- 239000003054 catalyst Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—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]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- 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
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- 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 Urea Urea-SCR mixer of a diesel internal combustion engine post-treatment system. Comprises a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end; the spiral mixing cavity comprises an air inlet end face plate, an air outlet end face plate and a spiral rotational flow guide plate, the guide plate forms an air flow channel which is formed by an air inlet and is in a vortex convergence type towards an air outlet, a convex peak type guide plate is arranged in the channel along the flowing direction of fluid, a plurality of groups of flow distribution plates are arranged, and a flow distribution disc is radially arranged in the flow distribution cavity along the cylinder. The mixer disclosed by the invention realizes rapid and sufficient atomization and pyrolysis of the urea aqueous solution by distributing and guiding the hot tail gas flow and strongly crushing and atomizing the urea aqueous solution; the mixed gas flows at a high speed in the spiral vortex convergence type airflow channel, so that uniform and sufficient mixing is realized; the convex peak type guide plate and the splitter plate distribute, guide, crush and disturb the mixed and high-speed flowing hot air flow; the flow equalizing disc distributes and guides high-speed rotational flow entering the rear cavity, and the conversion rate of ammonia is greatly improved.
Description
Technical Field
The invention discloses a Urea selective catalytic reduction (Urea-SCR) mixer of a diesel internal combustion engine post-treatment system, relates to the hot tail gas post-treatment technology of a diesel internal combustion engine, and particularly relates to the structural composition of the Urea-SCR mixer of the diesel internal combustion engine hot tail gas post-treatment system.
Background
With the increasing environmental protection importance of the country and the implementation of the national VI emission regulations of diesel internal combustion engines, the hot tail of the diesel internal combustion engineUrea is widely used in gas aftertreatment systems to reduce and abate NO in hot exhaustX(ii) a When the aftertreatment system works, the urea aqueous solution is required to be hydrolyzed after being sprayed, and ammonia gas can be generated to be mixed with NO in hot tail gas discharged by the internal combustion engineXThe reaction takes place. The hydrolysis of Urea is mainly realized by a static Urea-SCR mixer at present, but the Urea-SCR mixer adopted at present is insufficient in Urea hydrolysis, so that NO in hot tail gas cannot be effectively reducedXMoreover, there is a problem that a large amount of Urea crystals are generated inside the structure of the Urea-SCR mixer and on the front end surface of the SCR catalyst.
Disclosure of Invention
Aiming at the common problems and design defects in the prior Urea-SCR mixer technology for the diesel internal combustion engine post-treatment system, the invention aims to overcome and solve the defects of the prior Urea-SCR mixer in performance, including the problems of insufficient atomization after Urea aqueous solution is sprayed, Urea crystallization formation, low ammonia conversion rate and the like.
The technical scheme adopted by the invention is as follows:
diesel internal-combustion engine aftertreatment system Urea-SCR blender for gaseous tubular structure blender that link up, including setting up in the Urea nozzle mount pad of barrel wall, its characterized in that: the mixer of the cylinder structure consists of a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end;
a spiral mixing cavity: comprises an air inlet end panel positioned at the front end of a mixing cavity, an air outlet end panel positioned at the rear end of the mixing cavity and a spiral rotational flow guide plate between the two panels; the air inlet end panel is provided with an opening, and an air inlet is formed between the opening and the inner wall of the cylinder body and between the opening and the spiral rotational flow guide plate; an air outlet is formed by opening the air outlet end panel; the spiral rotational flow guide plate forms a vortex convergence type air flow channel from an air inlet to an air outlet between the air inlet end face plate and the air outlet end face plate, and two groups of convex peak type guide plates with wave structures are arranged in the vortex convergence type air flow channel along the flowing direction of fluid; the urea nozzle mounting seat is positioned at the rear side of the air inlet, and the urea solution spraying direction is arranged along the radial direction of the cylinder; the inner side of the air inlet is transversely provided with a splitter plate along the path of the urea solution injection direction, one end of the splitter plate is arranged at the inner side of the air inlet to divide the air inlet into two parts, the other end of the splitter plate is arranged on a spiral rotational flow guide plate or the wall of the cylinder, and the surface of the splitter plate is of a barrier structure; a plurality of groups of turbulence grid plates are sequentially arranged in front and back of a gas channel formed between the two groups of the convex-peak type guide plates with the wave-shaped structures;
flow equalizing cavity: the rear end of the air outlet end panel and the barrel form a part, a flow equalizing disc is radially arranged in the flow equalizing cavity along the barrel, and flow equalizing blades of a curved surface structure are radially and uniformly and symmetrically arranged on the flow equalizing disc.
Three groups of wave-shaped convex peak type guide plates can be arranged in the vortex convergence type airflow channel along the flowing direction of the fluid, one group is positioned on one side of the airflow channel, and the other two groups are positioned on the other side of the airflow channel and form a channel with a sine structure.
Three groups of turbulent grid plates can be arranged at the airflow inlet, the airflow outlet and the middle part of the airflow channel; each group of turbulence grid plates are uniformly arranged between the air inlet end plate and the air outlet end plate along the axial direction of the cylinder body.
The cross section of the turbulence strips forming the turbulence grid plate can be a polygon or a waist-shaped structure with arc edges.
The surface of the flow distribution plate is provided with a long slit or a porous ventilation structure and is transversely arranged in an arc shape along the spraying direction path of the urea solution.
The flow equalizing blade is a twisted fluid guide vane curved surface structure.
The opening of the air inlet end panel is in a circular, oval, rectangular or trapezoidal structure; the opening of the air outlet end panel is in a circular, oval, rectangular or trapezoidal structure.
Compared with the prior Urea-SCR mixer, the invention has the following beneficial effects:
(1) the Urea-SCR mixer realizes the rapid and sufficient atomization and pyrolysis of the Urea aqueous solution by distributing and guiding the hot tail gas flow and strongly crushing and atomizing the Urea aqueous solution sprayed by the Urea nozzle;
(2) a vortex convergent airflow channel is formed among the spiral rotational flow guide plate, the air inlet end panel and the air outlet end panel in the Urea-SCR mixer, and Urea aqueous solution is quickly and fully atomized and pyrolyzed and then flows at a high speed with hot tail gas entering through the air inlet in the vortex convergent airflow channel to realize uniform and full mixing;
(3) the Urea-SCR mixer is internally provided with the convex-peak type guide plate which is arranged in a vortex convergence type airflow channel formed by the spiral rotational flow guide plate, the air inlet end face plate and the air outlet end face plate, guides the mixed gas flowing at high speed in the channel, generates a strong Venturi effect in the flowing process of hot airflow, greatly prolongs the length of the airflow channel, obviously increases the mixing time of multi-component gas, and obviously improves the mixing effect of the multi-component gas;
(4) the Urea-SCR mixer is internally provided with the airflow inlet, the airflow outlet and the turbulence grid plate among the wave troughs of the vortex convergence type airflow channel, so that hot airflow flowing at high speed after mixing in the vortex convergence type airflow channel can be guided and crushed, and efficient and high-quality Urea pyrolysis and mixing with hot tail gas are realized;
(5) the flow equalizing disc in the rear cavity of the Urea-SCR mixer distributes and guides high-speed rotational flow entering the rear cavity of the Urea-SCR mixer through the air outlet; the hot air flow which passes through the flow equalizing disc and reaches the front end face of the Urea-SCR catalyst has excellent ammonia nitrogen mixing effect and molar ratio uniformity, greatly improves the conversion rate of ammonia, and solves the problem of Urea crystallization under the working condition of low temperature and low load.
Drawings
FIG. 1 is a front view of the mixer of the present invention;
FIG. 2 is a schematic view of the mixer structure of the intake end plate of the mixer of the present invention;
FIG. 3 is an axial front view of the mixer of the present invention;
FIG. 4 is an enlarged partial view of the mixer of the present invention; fig. 3 is a partially enlarged view;
FIG. 5 is an isometric view of the mixer of the present invention with the cartridge removed;
FIG. 6 is an isometric view of the mixer structure of the present invention;
fig. 7 is a rear view of the mixer of the present invention.
The figure is marked with:
1-cylinder, 2-urea nozzle mounting seat, 3-air inlet end panel, 4-spiral rotational flow guide plate, 5-splitter plate, 6-urea nozzle guard plate, 7-air outlet end panel, 8-air outlet, 9-convex peak guide plate, 10-turbulence grid plate, 11-flow equalizing disc, 100A-air inlet and 101-flow equalizing blade.
Detailed Description
The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.
With reference to the attached drawings.
The diesel internal combustion engine aftertreatment system Urea-SCR mixer comprises the following components: the device comprises a cylinder body 1, a urea nozzle mounting seat 2, a urea nozzle cover plate 6, an air inlet end face plate 3, an air inlet 100A, a flow distribution plate 5, a spiral rotational flow guide plate 4, a convex peak type guide plate 9, a turbulent flow grid plate 10, an air outlet end face plate 7, an air outlet 8 and a flow equalizing disc 11.
An air inlet 100A is formed among the cylinder 1, the air inlet end face plate 3 and the spiral swirl flow guide plate 4 of the mixer.
The splitter plate 5 is located at the air inlet 100A, and distributes and guides the hot gas flow to the hot exhaust entering the air inlet 100A.
A vortex convergence type airflow channel is formed among the spiral rotational flow guide plate 4, the air inlet end face plate 3 and the air outlet end face plate 7, and the urea aqueous solution crushed and atomized by the flow distribution plate 5 and the hot tail gas entering from the air inlet 100A flow in the vortex convergence type airflow channel at a high speed to perform sufficient and uniform mixing.
The invention arranges the convex peak type guide plates in the vortex convergent type airflow channel, two groups of the convex peak type guide plates are arranged in the vortex convergent type airflow channel formed by the spiral type rotational flow guide plates 4, the air inlet end face plate 3 and the air outlet end face plate 7, the Venturi effect is generated, and the hot airflow which flows at high speed after being mixed in the channel is guided.
The turbulent grid plate 10 is provided with three groups among an airflow inlet, an airflow outlet and a wave trough of the vortex convergence type airflow channel, and conducts and crushes hot airflow which flows at high speed after being mixed in the vortex convergence type airflow channel.
The flow equalizing disc 11 is positioned in a rear cavity of the Urea-SCR mixer, the mixture in the spiral vortex convergence type airflow channel is fully uniform, the high-speed flowing hot airflow enters the rear cavity of the mixer through the air outlet, a high-speed hot rotational flow is formed in the rear cavity, and then the high-speed hot rotational flow passes through the flow equalizing disc and reaches the front end face of the SCR catalyst.
As shown in the figure, the flow distribution plate 5 has a grid structure, is located at the air inlet 100A of the SCR urea mixer, distributes and guides the hot exhaust gas of the internal combustion engine entering the air inlet 100A, and crushes and atomizes the urea aqueous solution sprayed from the urea nozzle.
The spiral rotational flow guide plate 4 has spiral vortex type structural characteristics and forms a vortex convergence type airflow channel with the air inlet end face plate 3 and the air outlet end face plate 7; the hot tail gas entering from the gas inlet 100A is mixed with the pyrolyzed ammonia gas, flows at a high speed in the flow channel, is discharged through the gas outlet 8, enters the rear cavity of the SCR urea mixer, and forms a high-speed thermal cyclone in the rear cavity.
The convex peak type guide plate 9 is arranged in a vortex convergent type airflow channel formed by the spiral rotational flow guide plate 4, the air inlet end face plate 3 and the air outlet end face plate 7, and generates a Venturi effect to guide hot airflow which flows at high speed after being mixed in the channel; the convex-peak type guide plate 9 can be provided with a plurality of groups according to the requirement, and three groups are arranged in the embodiment to form a curved sinusoidal channel.
The turbulent flow grid plates 10 are arranged at an airflow inlet, among wave troughs and at an airflow outlet of the vortex convergence type airflow channel and are used for guiding and crushing hot airflow which flows at a high speed after mixing in the channel; several of them can be used according to the needs of practical application and occasion.
A flow equalizing disc 11 is arranged in a rear cavity of the Urea-SCR mixer, comprises a plurality of flow equalizing blades 101 in annular array, and is used for equalizing and stirring the ammonia hot tail gas flow discharged from a gas outlet 8 and fully mixed, then the flow equalizing blade flow reaches the front end face of an SCR catalyst and enters the SCR catalyst to perform selective catalytic reduction chemical reaction so as to eliminate diesel oilNO in hot exhaust gas of internal combustion engineXThe purpose of (1) meets the requirement of national VI emission standard.
The specific structure of the Urea-SCR mixer of the aftertreatment system of the diesel internal combustion engine according to the present invention will be described and illustrated with reference to FIGS. 1 to 7.
FIG. 1 is a front view of a Urea-SCR mixer configuration of an aftertreatment system of a diesel internal combustion engine of the present invention. The mixer includes barrel 1, installs urea nozzle mount pad 2 on the barrel 1 outer wall, arranges in the terminal surface board 3 that admits air of mixer front end and the terminal surface board 7 that gives vent to anger of rear end. The axial air inlet 100A of the mixer is formed by a cylinder 1, an air inlet end panel 3 and a spiral swirl deflector 4.
Fig. 2 is a schematic view of the Urea-SCR mixer structure of fig. 1 after the intake end panel 3 has been removed. A nozzle guard plate 6 and a splitter plate 5 are arranged below the urea nozzle mounting seat 2; the flow distribution plate 5 is located at the position where the diesel engine enters the air inlet 100A, has a grid type structural characteristic, distributes and guides air flow to the hot tail gas of the diesel engine entering the air inlet 100A, and crushes and atomizes the urea water solution sprayed by the urea nozzle. A spiral swirl flow guide plate 4 is arranged between the air inlet end face plate 3 (not shown) and the air outlet end face plate 7 at the rear end, and forms a vortex convergence type airflow channel with the air inlet end face plate 3 and the air outlet end face plate 7, and the urea aqueous solution crushed and atomized by the flow distribution plate 5 and the hot tail gas entering from the air inlet 100A flow at a high speed in the vortex convergence type airflow channel to be uniformly and fully mixed. The convex peak type guide plate 9 is arranged in a vortex convergence type airflow channel formed by the spiral type rotational flow guide plate 4, the air inlet end face plate 3 and the air outlet end face plate 7, and guides hot airflow which flows at high speed after mixing in the channel; the turbulent grid plates 10 are arranged at the airflow inlet, between the wave troughs and at the airflow outlet of the vortex convergence type airflow channel, and are used for crushing and guiding the hot airflow which flows at high speed after being mixed in the vortex convergence type airflow channel.
Fig. 3 is an axial front view of the Urea-SCR mixer of fig. 2, the inlet end panels 3 not being shown. The flow distribution plate 5 with the grid type structural characteristic is positioned at the position of the air inlet 100A to distribute and guide the air flow of the hot tail gas of the internal combustion engine, and to crush and atomize the urea water solution sprayed by the urea nozzle. The convex peak type guide plate 9 is arranged in a vortex convergence type airflow channel formed between the spiral type rotational flow guide plate 4 and the air inlet end face plate 3 and the air outlet end face plate 7, and guides the hot airflow which flows at high speed after mixing in the channel, a strong Venturi effect is generated in the flowing process of the hot airflow, the length of the airflow channel is greatly prolonged, the mixing time of multi-component gas is remarkably increased, and the mixing effect of the multi-component gas is remarkably improved. After hot tail gas in the airflow channel is mixed with Urea aqueous solution ejected by the nozzle by the turbulence grid plates 10 positioned at the airflow inlet, the trough and the airflow outlet of the vortex convergence type airflow channel, hot airflow flowing at high speed is fully and uniformly mixed, then flows out through the air outlet 8 on the air outlet end face plate 7 and enters a rear cavity of the Urea-SCR mixer, and high-speed hot rotational flow is formed in the rear cavity.
Fig. 4 is a partially enlarged view of the Urea-SCR mixer of fig. 3. A urea nozzle guard plate 6 is arranged below the urea nozzle mounting seat 2 arranged on the outer wall surface of the cylinder body 1; a flow distribution plate 5 with a grid structure characteristic is arranged below the urea nozzle protective cover plate 6, is positioned at the air inlet of the air inlet 100A, distributes and guides air flow to the hot tail gas of the internal combustion engine entering the air inlet 100A, and crushes and atomizes the urea water solution sprayed by the urea nozzle. The turbulent flow grid plate 10 located at the air flow inlet of the vortex convergent air flow channel guides the high-speed hot air flow entering the air flow channel.
FIG. 5 is an isometric view of the Urea-SCR mixer of FIG. 1 with the barrel removed; a urea nozzle guard plate 6 is arranged below the urea nozzle mounting seat 2 arranged on the outer wall surface of the cylinder 1; a flow distribution plate 5 with a grid structure characteristic is arranged below the urea nozzle protective cover plate 6 and at the inlet of the air inlet 100A, and is used for distributing and guiding air flow of the hot tail gas of the internal combustion engine entering the air inlet 100A and crushing and atomizing the urea water solution sprayed by the urea nozzle. A spoiler grid 10 is provided at an air flow inlet of the vortex convergent air flow passage to guide a hot air flow flowing at a high speed in the vortex convergent air flow passage. An axial air inlet 100A is formed among the inner wall surface of the cylinder 1, the air inlet end surface plate 3, the air outlet end surface plate 7 at the rear end and the spiral rotational flow guide plate 4. In the rear chamber of the Urea-SCR mixer there is a flow equalizing disc 10 containing a number of annular arrays of flow equalizing vanes 101.
Fig. 6 is a schematic axial-side line frame structure diagram of the Urea-SCR mixer in fig. 1, an axial air inlet 100A is formed between the inner wall surface of the cylinder 1, the air inlet end plate 3, the rear air outlet end plate 7 and the spiral swirl flow guide plate 4; a spiral type whirl guide plate 4 is arranged between the air inlet end face plate 3 and the rear end air outlet end face plate 7, and forms a vortex convergence type airflow channel with the air inlet end face plate 3 and the air outlet end face plate 7, and the urea aqueous solution crushed and atomized by the flow distribution plate 5 and the hot tail gas entering from the air inlet 100A flow at a high speed in the vortex convergence type airflow channel to be uniformly and fully mixed. The convex peak type guide plate 9 is arranged in a vortex convergence type airflow channel formed by the spiral type rotational flow guide plate 4, the air inlet end face plate 3 and the air outlet end face plate 7, and guides hot airflow which flows at high speed after mixing in the channel; the turbulent grid plates 10 are arranged at the airflow inlet, between the wave troughs and at the airflow outlet of the vortex convergence type airflow channel, and are used for crushing and guiding the hot airflow which flows at high speed after being mixed in the vortex convergence type airflow channel.
FIG. 7 is a rear view of the Urea-SCR mixer of FIG. 5 with the barrel removed. After hot exhaust gas of the diesel internal combustion engine enters through an air inlet 100A (not shown) formed by the cylinder 1 (not shown), the air inlet end panel 3 and the spiral rotational flow guide plate 4, the flow distribution plate 5 at the inlet performs flow distribution and flow guide of hot air flow, and the hot exhaust gas is mixed with the urea aqueous solution sprayed by the urea aqueous solution nozzle, flows at a high speed in a vortex convergence type air flow channel formed by the spiral rotational flow guide plate 4, and is uniformly and fully mixed. A baffle plate 10 is disposed at the air inlet of the vortex convergent air flow channel to guide the high-speed hot air flow entering the channel.
The mixed gas enters a rear cavity of a Urea-SCR mixer through a gas outlet 8, forms high-speed rotational flow in the rear cavity, and then passes through a flow equalizing disc 10 consisting of a plurality of annular array flow equalizing blades 101; the flow equalizing blade 101 further stirs and equalizes the flow of the ammonia hot tail gas in the rear cavity of the Urea-SCR mixer in a high-speed rotational flow manner, and the ammonia hot tail gas is conveyed to the front end face of the inlet of the SCR catalyst and enters the SCR catalystEntering into SCR catalyst for selective catalytic reduction chemical reaction to eliminate NO in hot tail gas of diesel engineXAnd meets the requirements of national VI emission standards.
In the embodiment of the invention, the air inlet 100A on the air inlet end plate 3 and the air outlet 8 on the air outlet end plate 7 in the Urea-SCR mixer can be in any geometric shape such as a circle, an ellipse, a rectangle, a trapezoid and the like, and the structural representation in the Urea-SCR mixer embodiment is not limited.
Claims (7)
1. The utility model provides a diesel internal-combustion engine aftertreatment system Urea-SCR blender, is gaseous tubular structure blender that link up, including setting up in the Urea nozzle mount pad of barrel wall, its characterized in that: the mixer of the cylinder structure consists of a spiral mixing cavity at the front end and a flow equalizing cavity at the rear end;
a spiral mixing cavity: comprises an air inlet end panel positioned at the front end of a mixing cavity, an air outlet end panel positioned at the rear end of the mixing cavity and a spiral rotational flow guide plate between the two panels; the air inlet end panel is provided with an opening, and an air inlet is formed between the opening and the inner wall of the cylinder body and between the opening and the spiral rotational flow guide plate; an air outlet is formed by opening the air outlet end panel; the spiral rotational flow guide plate forms a vortex convergence type air flow channel from an air inlet to an air outlet between the air inlet end face plate and the air outlet end face plate, and a wave-shaped convex peak type guide plate is arranged in the vortex convergence type air flow channel along the flowing direction of fluid; the urea nozzle mounting seat is positioned at the rear side of the air inlet, and the urea solution spraying direction is arranged along the radial direction of the cylinder; the inner side of the air inlet is transversely provided with a splitter plate along the path of the urea solution injection direction, one end of the splitter plate is arranged at the inner side of the air inlet to divide the air inlet into two parts, the other end of the splitter plate is arranged on a spiral rotational flow guide plate or the wall of the cylinder, and the surface of the splitter plate is of a barrier structure; a plurality of groups of turbulence grid plates are sequentially arranged in front and back of a gas channel formed between the two groups of the convex-peak type guide plates with the wave-shaped structures;
flow equalizing cavity: the rear end of the air outlet end panel and the barrel form a part, a flow equalizing disc is radially arranged in the flow equalizing cavity along the barrel, and flow equalizing blades of a curved surface structure are radially and uniformly and symmetrically arranged on the flow equalizing disc.
2. The diesel internal combustion engine aftertreatment system Urea Urea-SCR mixer according to claim 1, characterized in that: three groups of wave-shaped convex peak type guide plates are arranged in the vortex convergence type airflow channel along the flowing direction of the fluid, one group is positioned on one side of the airflow channel, and the other two groups are positioned on the other side of the airflow channel and form a channel with a sine structure.
3. The diesel internal combustion engine aftertreatment system Urea Urea-SCR mixer of claim 2, characterized in that: three groups of turbulent flow grid plates are arranged at the airflow inlet, the airflow outlet and the middle part of the airflow channel; each group of turbulence grid plates are uniformly arranged between the air inlet end plate and the air outlet end plate along the axial direction of the cylinder body.
4. The diesel internal combustion engine aftertreatment system Urea Urea-SCR mixer according to claim 3, characterized in that: the cross section of the turbulence strip forming the turbulence grid plate is of a polygonal or waist-shaped structure with arc edges.
5. The diesel internal combustion engine aftertreatment system Urea Urea-SCR mixer according to claim 4, characterized in that: the surface of the flow distribution plate is provided with a long slit or a porous ventilation structure and is transversely arranged in an arc shape along the spraying direction path of the urea solution.
6. A Urea-SCR mixer for the aftertreatment system of a diesel combustion engine according to any of claims 1 to 5, characterized in that: the flow equalizing blade is a twisted fluid guide vane curved surface structure.
7. The diesel internal combustion engine aftertreatment system Urea Urea-SCR mixer according to claim 6, characterized in that: the opening of the air inlet end panel is of a circular, oval, rectangular or trapezoidal structure; the opening of the air outlet end panel is in a circular, oval, rectangular or trapezoidal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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