CN110848007A - Urea mixing device - Google Patents
Urea mixing device Download PDFInfo
- Publication number
- CN110848007A CN110848007A CN201911315003.3A CN201911315003A CN110848007A CN 110848007 A CN110848007 A CN 110848007A CN 201911315003 A CN201911315003 A CN 201911315003A CN 110848007 A CN110848007 A CN 110848007A
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- Prior art keywords
- plate
- urea
- partition plate
- crushing
- opening
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 239000004202 carbamide Substances 0.000 title claims abstract description 144
- 238000002156 mixing Methods 0.000 title claims abstract description 62
- 238000005192 partition Methods 0.000 claims abstract description 54
- 238000005507 spraying Methods 0.000 claims abstract description 17
- 239000011148 porous material Substances 0.000 claims abstract description 16
- 241000196324 Embryophyta Species 0.000 claims 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 73
- 230000000694 effects Effects 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 65
- 239000013078 crystal Substances 0.000 description 23
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 19
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000007921 spray Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 4
- 235000017060 Arachis glabrata Nutrition 0.000 description 3
- 241001553178 Arachis glabrata Species 0.000 description 3
- 235000010777 Arachis hypogaea Nutrition 0.000 description 3
- 235000018262 Arachis monticola Nutrition 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 235000020232 peanut Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- 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
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a urea mixing device.A partition plate is arranged between a front shell and a rear shell, a crushing plate is fixed on the partition plate, a front baffle plate is arranged at the front end part of the partition plate, an opening is formed on the front baffle plate corresponding to the partition plate, a flow guide plate and a pore plate are arranged on the opening, and an air inlet is formed between the flow guide plate and the inner wall surface corresponding to the front shell; the guide plate is provided with blades which are opened inwards towards the spraying cavity; the pore plate is provided with a plurality of first through holes; a grating opening is arranged on the wall surface of the clapboard opposite to the crushing plate; the rear shell is formed with a waist-contracting portion. The partition plate is provided with a plurality of grating openings opposite to the crushing plate, and the grating openings have a secondary crushing effect on urea liquid drops, so that the urea liquid drops are atomized and volatilized more thoroughly, the mixed gas flow is more favorably and fully mixed, and the mixing uniformity is higher. The back shell is formed with and receives the waist, and the velocity of flow can increase when receiving the waist to the air current, and the mixing effect is better, and the homogeneity of mixing is higher.
Description
Technical Field
The invention relates to the technical field of automobile exhaust aftertreatment, in particular to a urea mixing device.
Background
An automobile exhaust post-treatment device belongs to an engine exhaust system and mainly aims to remove Nitrogen Oxides (NO) in automobile exhaustX) The harmful gases such as hydrocarbon (CH) and carbon monoxide (CO) are converted into nitrogen (N) which is harmless to the environment2) And water (H)2O), and the like. At present, the DOC (oxidative catalyst) + DPF (particle filter) + SCR (selective catalytic reduction) technology is commonly adopted in the national six diesel engines to carry out aftertreatment on exhaust emission, the atomization and mixing effect of urea aqueous solution in aftertreatment has great influence on the selective reduction reaction carried out in the follow-up SCR, and the key for improving the uniformity of mixing urea and exhaust in a mixer is to improve the aftertreatment conversion efficiency.
The existing tail gas aftertreatment mixer usually has the problems of poor uniformity of gas flow velocity distribution and poor ammonia mixing uniformity. Poor uniformity of gas flow velocity distribution can lead to non-uniform catalyst aging on the one hand; on the other hand, because the gas flow velocity distribution is uneven, the temperature of the inner wall surface of the area with small gas flow velocity in the tail gas aftertreatment mixing device is low, and when urea liquid drops contact with the inner wall surface of the area, a part of heat can be taken away, so that the temperature of the inner wall surface of the area is further reduced, and the urea liquid drops falling on the inner wall surface with too low temperature are easy to form urea crystals due to insufficient heat absorption and volatilization, so that the conversion efficiency of aftertreatment can be greatly reduced. Once urea crystals appear, unless the engine enters a high-temperature working condition, the crystals are burnt, and the crystals grow gradually along with the time, finally block a mixer, even block the surface of an SCR carrier, and cause aftertreatment failure. If the urea injection amount is large and the ammonia is not sufficiently and uniformly mixed, the condition of insufficient reaction can occur in the SCR system, so that the tail gas emission is influenced, and a large amount of ammonia gas can overflow to pollute the air.
Disclosure of Invention
The applicant provides a shell type peanut urea mixing device with a reasonable structure aiming at the defects of poor gas flow velocity distribution uniformity, easy formation of urea crystals, poor mixing uniformity and the like of the existing tail gas aftertreatment mixer, and the shell type peanut urea mixing device is high in gas flow velocity distribution uniformity, low in crystallization risk and high in mixing uniformity.
The technical scheme adopted by the invention is as follows:
a urea mixing device is characterized in that an inner cavity is formed between a front shell and a rear shell, an air inlet cylinder is arranged at the upper part of the front shell, an air outlet is arranged at the lower part of the front shell, a partition plate is arranged between the front shell and the rear shell, a crushing plate is fixed on the partition plate, and the partition plate and the crushing plate divide the inner cavity into an injection cavity, a mixing cavity and a flow guide cavity, wherein the injection cavity is positioned inside the partition plate and outside the crushing plate, the mixing cavity is positioned between the crushing plate and the partition plate; the front end part of the baffle plate is provided with a front baffle plate, the front baffle plate is provided with an opening corresponding to the baffle plate, the opening is provided with a guide plate and a pore plate, and an air inlet is formed between the outer side edge of the guide plate and the inner wall surface corresponding to the front shell; the guide plate is provided with a first opening and a second opening, and the second opening is provided with a blade which is opened inwards towards the spraying cavity; the pore plate is provided with a plurality of first through holes; a grating opening is formed in the wall surface, opposite to the crushing plate, of the partition plate; the longitudinal middle part of the rear shell is inwards concave towards the inner cavity to form a waist-contracting part.
The tail gas flow in the internal cavity is decomposed and mixed for multiple times, the urea dropping liquid is fully decomposed, and the decomposed NH is3Fully mixed with tail gas, high mixing uniformity and NOXThe conversion rate is high. On one hand, the grid openings have a secondary crushing effect on urea liquid drops, so that the urea liquid drops are further crushed to be smaller, and the urea liquid drops are ensured to be atomized and volatilized more thoroughly; on the other hand, the mixed air flow in the mixing cavity flows into the flow guide cavity through the grille opening, so that the overflowing speed of the mixed air flow is not too high, the mixed air flow is more favorably fully mixed, and the mixing uniformity is higher. A waist-contracting part is formed on the left side and the right side of the longitudinal middle part of the rear shell, and the section size of the waist-contracting part is smaller than that of the upper part and the lower part of the rear shell; the mixed air current that flows along the wall of back shell is when receiving the waist because cross sectional dimension diminishes, and the velocity of flow of mixed air current can increase, and the mixed air current after accelerating forms the whirl more easily behind the internal face that gets into the cross sectional dimension grow along the internal face that receives the waist, and the whirl effect is better for mixed air current's mixed effect is better, and the homogeneity of mixing is higher.
As a further improvement of the above technical solution:
the outer surface of the upper part of the rear shell is inwards recessed to form a pit, the bottom surface of the pit is provided with a nozzle seat, and the urea nozzle is arranged on the nozzle seat; the inner wall surface of the rear shell corresponding to the concave pit is fixedly provided with a baffle plate, and the baffle plate shields the periphery of the nozzle seat on one side of the air inlet cylinder.
The rear shell is internally and fixedly provided with a U-shaped baffle plate with one open end and one closed end corresponding to the inner wall surface of the pit, the closed end of the U-shaped baffle plate is positioned on one side of the air inlet cylinder, the baffle plate shields the periphery of a urea nozzle on the nozzle seat, namely the baffle plate is arranged on the periphery of the nozzle seat positioned on one side of the air inlet cylinder, so that tail gas flow entering the air inlet cylinder is shielded, and the tail gas flow is prevented from directly blowing urea spraying rays, so that urea liquid drops are blown onto the inner wall surface of the rear shell to form urea crystals.
The shielding plate is positioned at the inner side of the air inlet.
The shielding plate is correspondingly positioned at the inner side of the air inlet, and the tail gas airflow entering from the air inlet can heat the shielding plate, so that urea liquid drops falling on the shielding plate can fully absorb heat and volatilize, and urea crystals are prevented from being formed.
The shielding plate is in a U shape with one open end and one closed end.
The clapboard is U-shaped and comprises an arc section and a parallel section; the front baffle is correspondingly provided with a U-shaped opening.
The guide plate is a square plate and is correspondingly arranged on the front side of the parallel section of the partition plate; the blade opening on the guide plate is opposite to the crushing plate.
Hair brushThe blade opening of the open guide plate is opposite to the crushing plate, and the mixed air flow can be guided to blow to the crushing plate, so that on one hand, the urea dropping liquid can be prevented from being blown to the inner wall surface of the rear shell to form urea crystals by the mixed air flow directly blowing urea spraying rays, and the risk of the urea crystals on the rear shell is reduced; on the other hand, the blade guides the mixed gas flow to blow to the crushing plate, the heat of tail gas can be fully utilized, urea liquid drops falling on the crushing plate fully absorb heat and volatilize, the volatilization rate of the urea liquid drops is improved, and NO is further improvedXThe conversion efficiency of (a); in addition, the blades have the function of scattering and breaking urea liquid drops, and the urea liquid drops are broken into smaller liquid drops and are easier to volatilize.
The pore plate is a semicircular arc plate and is correspondingly arranged on the front side of the arc section of the partition plate.
The pore plate is a semicircular arc plate and is correspondingly arranged on the front side of the arc section of the partition plate, the tail gas flow is dispersed through the pore plate and enters the mixing cavity, the air inlet is more uniform, the tail gas flow is more fully mixed with urea liquid drops crushed and volatilized by the crushing plate, the urea liquid drops further absorb heat and volatilize, the volatilization rate of the urea liquid drops is improved, and further the NO is improvedXThe conversion efficiency of (a).
The crushing plate is an arc-shaped plate, and the arc shape of the crushing plate is convex towards the direction of the arc section of the partition plate.
The crushing plate is an arc-shaped plate, the crushing plate plays a role in scattering and crushing urea liquid drops, and the urea liquid drops are crushed into smaller liquid drops and are easier to volatilize; the arc shape of the spray nozzle is convex towards the direction of the arc section of the partition plate, namely the crushing plate is convex towards the direction far away from the nozzle seat, so that the spray space of the spray cavity can be increased, urea liquid drops and tail gas flow have sufficient space to be mixed, and the mixing performance is better; the crushing plate protrudes towards the direction far away from the nozzle seat, so that the area of the wall surface for crushing urea liquid drops can be increased at the same time, and the urea liquid drops are fully crushed into smaller liquid drops.
Two outer sides of the crushing plate corresponding to the partition plate are respectively provided with a groove.
The two outer sides of the corresponding partition plates are respectively provided with the grooves, mixed airflow can flow downwards along the inner wall surface of the arc section of the partition plate after flowing through the grooves, and the inner wall surface of the arc section of the partition plate is heated, so that urea liquid drops falling on the inner wall surface of the arc section 27 are fully absorbed by heat and volatilized, and urea crystals are prevented from being formed.
The arc section of the partition board is provided with a plurality of grid openings which are arranged in an array manner and correspond to the wall surface on one side of the flow guide cavity.
The grid opening is arranged on the wall surface at one side of the flow guide cavity, so that the mixed air flow can be guided to downwards enter the flow guide cavity, and the urea liquid drops in the mixed air flow are prevented from depositing on the side wall surface of the rear shell to form urea crystals due to the fact that the mixed air flow flowing through the grid opening impacts on the side wall surface of the rear shell.
The invention has the following beneficial effects:
the tail gas flow in the internal cavity is decomposed and mixed for multiple times, the urea dropping liquid is fully decomposed, and the decomposed NH is3Fully mixed with tail gas, high mixing uniformity and NOXThe conversion rate is high. On one hand, the grid openings have a secondary crushing effect on urea liquid drops, so that the urea liquid drops are further crushed to be smaller, and the urea liquid drops are ensured to be atomized and volatilized more thoroughly; on the other hand, the mixed air flow in the mixing chamber flows into the flow guide chamber through the grille opening, so that the overflowing speed of the mixed air flow is not too high, the mixed air flow is more favorably fully mixed, and the mixing uniformity is higher. A waist-contracting part is formed on the left side and the right side of the longitudinal middle part of the rear shell, and the section size of the waist-contracting part is smaller than that of the upper part and the lower part of the rear shell; the mixed air current that flows along the wall of back shell is when receiving the waist because cross sectional dimension diminishes, and the velocity of flow of mixed air current can increase, and the mixed air current after accelerating forms the whirl more easily behind the internal face that gets into the cross sectional dimension grow along the internal face that receives the waist, and the whirl effect is better for mixed air current's mixed effect is better, and the homogeneity of mixing is higher.
The rear shell is internally and fixedly provided with a U-shaped baffle plate with one open end and one closed end corresponding to the inner wall surface of the pit, the closed end of the U-shaped baffle plate is positioned on one side of the air inlet cylinder, the baffle plate shields the periphery of a urea nozzle on the nozzle seat, namely the baffle plate is arranged on the periphery of the nozzle seat positioned on one side of the air inlet cylinder, so that tail gas flow entering the air inlet cylinder is shielded, and the tail gas flow is prevented from directly blowing urea spraying rays, so that urea liquid drops are blown onto the inner wall surface of the rear shell to form urea crystals. The shielding plate is correspondingly positioned at the inner side of the air inlet, and the tail gas airflow entering from the air inlet can heat the shielding plate, so that urea liquid drops falling on the shielding plate can fully absorb heat and volatilize, and urea crystals are prevented from being formed.
The opening of the blade of the guide plate is opposite to the crushing plate, and the mixed gas flow can be guided to blow to the crushing plate, so that on one hand, the urea dropping liquid can be prevented from blowing to the inner wall surface of the rear shell to form urea crystals when the mixed gas flow directly blows urea spraying rays, and the risk of the urea crystals on the rear shell is reduced; on the other hand, the blade guides the mixed gas flow to blow to the crushing plate, the heat of tail gas can be fully utilized, urea liquid drops falling on the crushing plate fully absorb heat and volatilize, the volatilization rate of the urea liquid drops is improved, and NO is further improvedXThe conversion efficiency of (a); in addition, the blades have the function of scattering and breaking urea liquid drops, and the urea liquid drops are broken into smaller liquid drops and are easier to volatilize.
The pore plate is a semicircular arc plate and is correspondingly arranged on the front side of the arc section of the partition plate, the tail gas flow is dispersed through the pore plate and enters the mixing cavity, the air inlet is more uniform, the tail gas flow is more fully mixed with urea liquid drops crushed and volatilized by the crushing plate, the urea liquid drops further absorb heat and volatilize, the volatilization rate of the urea liquid drops is improved, and further the NO is improvedXThe conversion efficiency of (a).
The crushing plate is an arc-shaped plate, the crushing plate plays a role in scattering and crushing urea liquid drops, and the urea liquid drops are crushed into smaller liquid drops and are easier to volatilize; the arc shape of the spray nozzle is convex towards the direction of the arc section of the partition plate, namely the crushing plate is convex towards the direction far away from the nozzle seat, so that the spray space of the spray cavity can be increased, urea liquid drops and tail gas flow have sufficient space to be mixed, and the mixing performance is better; the crushing plate 7 protrudes in the direction away from the nozzle holder, so that the area of the wall surface for crushing urea droplets can be increased at the same time, and the urea droplets are fully crushed into smaller droplets. The breaker is seted up flutedly in two outsides that correspond the baffle respectively, and the mixed gas stream can flow along the arc section inner wall face downward of baffle after flowing from the recess, heats the arc section internal face of baffle, makes the urea liquid drop that falls on 27 internal faces of arc section fully absorb heat and volatilize, avoids forming the urea crystallization.
The grid opening is arranged on the wall surface at one side of the flow guide cavity, so that the mixed air flow can be guided to downwards enter the flow guide cavity, and the urea liquid drops in the mixed air flow are prevented from depositing on the side wall surface of the rear shell to form urea crystals due to the fact that the mixed air flow flowing through the grid opening impacts on the side wall surface of the rear shell.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a front view of fig. 1.
Fig. 4 is a right side view of fig. 1.
Fig. 5 is a sectional view a-a in fig. 4.
Fig. 6 is a front view of a baffle.
Fig. 7 is a right side view of the baffle.
Fig. 8 is a perspective view of an orifice plate.
In the figure: 1. a front housing; 2. a rear housing; 3. an air inlet cylinder; 4. a nozzle holder; 5. a baffle; 6. an orifice plate; 7. a breaker plate; 8. an air outlet; 9. a front baffle; 10. a shielding plate; 11. a partition plate; 12. a pit; 13. an interior cavity; 14. an ejection chamber; 15. a mixing chamber; 16. a flow guide cavity; 17. a first opening; 18. a second opening; 19. a blade; 20. a first through hole; 21. a second through hole; 22. a groove; 23. a grille opening; 24. an opening; 25. Spraying rays on urea; 26. closing the waist; 27. a circular arc section; 28. a parallel segment; 29. an air inlet.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the front housing 1 of the present invention is fixed on the rear housing 2, an inner cavity 13 is formed between the front housing 1 and the rear housing 2, the left and right sides of the middle portion of the front housing 1 and the rear housing 2 are respectively recessed inward toward the inner cavity 13 to form a waisted structure, and the cross section of the present invention along the longitudinal axis is peanut shell-shaped. The upper part of the front shell 1 is provided with an air inlet cylinder 3, the lower part is provided with a cylindrical air outlet 8, and the air inlet cylinder 3 and the air outlet 8 are communicated with an inner cavity 13. As shown in fig. 2, a U-shaped partition plate 11 is fixedly arranged between the front shell 1 and the rear shell 2, and the partition plate 11 comprises an inner circular arc section 27 and an outer parallel section 28; the clapboard 11 is welded on the rear shell 2, and the crushing plate 7 is fixed in the U-shaped inner part of the clapboard 11; as shown in fig. 4, the partition 11 and the crushing plate 7 divide the inner cavity 13 into an injection cavity 14, a mixing cavity 15 and a diversion cavity 16, the injection cavity 14 is located inside the partition 11 and outside the crushing plate 7, the mixing cavity 15 is located between the crushing plate 7 and the arc section 27 of the partition 11, and the diversion cavity 16 is located outside the partition 11. As shown in fig. 1 and 2, a front baffle 9 is arranged at the front end of the partition plate 11, the front baffle 9 is fixed on the front shell 1, a U-shaped opening 24 is formed on the front baffle 9 corresponding to the U-shaped partition plate 11, a flow guide plate 5 and a pore plate 6 are embedded on the opening 24, the pore plate 6 is located at the arc-shaped section at the inner side of the opening 24, and the flow guide plate 5 is located at the parallel section 28 at the outer side of the opening 24; as shown in fig. 3, an air inlet 29 is formed between the outer side of the baffle 5 and the inner wall surface of the front housing 1. The outer surface of the upper part of the rear shell 2, which faces the crushing plate 7, is recessed inwards towards the inner cavity 13 to form a pit 12, the bottom surface of the pit 12 is provided with a nozzle holder 4, a urea nozzle is arranged on the nozzle holder 4 (not shown in the figure) and can spray urea liquid drops into the spraying cavity 14, and the urea spraying line 25 faces the crushing plate 7 for spraying. As shown in fig. 2 and 5, a U-shaped shielding plate 10 with an open end and a closed end is fixedly arranged on the inner wall surface of the rear housing 2 corresponding to the pit 12, the closed end is positioned at one side of the air inlet cylinder 3, the shielding plate 10 shields the periphery of the urea nozzle on the nozzle holder 4, that is, the shielding plate 10 is arranged at the periphery of the nozzle holder 4 at one side of the air inlet cylinder 3, so that the tail gas flow entering the air inlet cylinder 3 is shielded, and the tail gas flow is prevented from directly blowing the urea spraying line 25, so that urea liquid drops are blown onto the inner wall surface of the rear housing 2 to form urea crystals; as shown in fig. 3, the shielding plate 10 is correspondingly located inside the air inlet 29, and the exhaust gas flow entering from the air inlet 29 can heat the shielding plate 10, so that urea droplets falling on the shielding plate 10 can be fully volatilized by heat absorption, and urea crystals are prevented from being formed.
As shown in fig. 4, the taper is provided between the front end and the rear end of the rear housing 2, so that the flow guiding function can be performed on the input tail gas flow, the tail gas flow can be uniformly distributed in the internal cavity 13, and each wall surface of the rear housing 2 is preheated, so that urea droplets falling on each wall surface can be fully absorbed and volatilized, the evaporation rate of the urea droplets is improved, and urea crystals are prevented from being formed on each wall surface. As shown in fig. 5, waist portions 26 are formed on the left and right sides of the longitudinal middle portion of the rear housing 2, and the sectional size of the waist portions 26 is smaller than that of the upper and lower portions of the rear housing 2; when the mixed air current that flows along the wall of back shell 2 is through closing waist 26, because cross sectional dimension diminishes, mixed air current's velocity of flow can increase, and mixed air current after the acceleration forms the whirl more easily after the internal wall face that gets into cross sectional dimension grow along the internal wall face that closes waist 26, and the whirl effect is better for mixed air current's mixed effect is better, and the homogeneity of mixing is higher.
As shown in fig. 6 and 7, the diversion plate 5 is a square plate and correspondingly disposed on the front side of the parallel section 28 of the partition plate 11, and the exhaust gas flow is guided by the diversion plate 5 to enter the injection cavity 14. Two square first openings 17 and a plurality of strip square second openings 18 located inside and below the two first openings 17 are formed in the guide plate 5 in an array manner, and as shown in fig. 1, the long sides of the second openings 18 are perpendicular to the central axis direction of the nozzle holder 4. As shown in fig. 6 and 7, the second opening 18 is provided with a blade 19 along the longitudinal direction, as shown in fig. 1 and 2, the blade 19 opens inward toward the injection cavity 14, the opening of the blade 19 faces the breaker plate 7, and the mixed gas flow can be guided to blow toward the breaker plate 7, so that on one hand, the mixed gas flow can be prevented from blowing the urea spray line 25 directly to blow urea drops onto the inner wall surface of the rear housing 2 to form urea crystals, and the risk of urea crystals on the rear housing 2 is reduced; on the other hand, the blade 19 guides the mixed gas flow to blow to the crushing plate 7, so that the heat of the tail gas can be fully utilized, urea liquid drops falling on the crushing plate 7 fully absorb heat and volatilize, the volatilization rate of the urea liquid drops is improved, and NO is further improvedXThe conversion efficiency of (a); in addition, the blades 19 have a function of breaking up and breaking up urea droplets, and the urea droplets are broken into smaller droplets and are easier to volatilize. On the first opening 17Without the blocking element, the air flow channel is smooth, and the air flow passing through the first opening 17 enters from both sides of the shielding plate 10, so that the backflow of the air flow in the injection cavity 14 can be reduced, and the influence of the backflow on the injection direction of the urea injection line 25 is avoided.
As shown in fig. 1 and 2, the orifice plate 6 is a semi-circular arc plate and is correspondingly disposed in front of the circular arc section 27 of the partition plate 11, and the exhaust gas flow is dispersed into the mixing chamber 15 through the orifice plate 6. A plurality of first through holes 20 are formed in the pore plate 6 in a staggered mode, tail gas airflow enters the mixing cavity 15 through the first through holes 20 in a dispersed mode, air inlet is more uniform, the tail gas airflow is more fully mixed with urea liquid drops which are crushed and volatilized through the crushing plate 7, the urea liquid drops further absorb heat and volatilize, the volatilization rate of the urea liquid drops is improved, and then NO is improvedXThe conversion efficiency of (a).
As shown in fig. 8, the breaker plate 7 is an arc-shaped plate, the breaker plate 7 breaks up and breaks urea droplets, and the urea droplets are broken into smaller droplets and are more easily volatilized; as shown in fig. 5, the arc shape is convex toward the U-shaped arc section 27 of the partition plate 11, that is, the crushing plate 7 is convex toward the direction away from the nozzle holder 4, so that the injection space of the injection chamber 14 can be increased, and the urea liquid drops and the tail gas flow have sufficient space to be mixed, and the mixing performance is better; the protrusion of the breaker plate 7 in the direction away from the nozzle holder 4 can also increase the area of the wall surface of the urea droplet breaker, so that the urea droplets are broken into smaller droplets. As shown in fig. 8, the arc-shaped face plate of the crushing plate 7 is distributed with a plurality of second through holes 21 in a staggered manner, and the mixed air flows through the plurality of second through holes 21, so that the mixed air is more fully mixed in the mixing chamber 15, and the mixing uniformity is higher; the crushing plate 7 is respectively provided with the grooves 22 at two outer sides corresponding to the partition plate 11, the mixed air flow can flow downwards along the inner wall surface of the arc section 27 of the partition plate 11 after flowing through the grooves 22, and the inner wall surface of the arc section 27 of the partition plate 11 is heated, so that urea liquid drops falling on the inner wall surface of the arc section 27 are fully heat-absorbed and volatilized, and urea crystal formation is avoided.
As shown in fig. 2, a plurality of grid openings 23 arranged in an array are formed in the wall surface of the arc section 27 of the partition plate 11, which is opposite to the crushing plate 7 and corresponds to one side of the flow guide cavity 16, and the grid openings 23 are located at the opposite side of the nozzle holder 4, so that on one hand, the grid openings 23 have a secondary crushing effect on urea droplets, the urea droplets are further crushed to be smaller, and the urea droplets are ensured to be atomized and volatilized more thoroughly; on the other hand, the mixed air flow in the mixing cavity 15 flows into the flow guide cavity 16 through the grille opening 23, so that the flow speed of the mixed air flow is not too high, the mixed air flow is more favorably and fully mixed, and the mixing uniformity is higher. The grille opening 23 is opened on the wall surface on one side of the diversion cavity 16, and can guide the mixed airflow to enter the diversion cavity 16 downwards, so that the mixed airflow flowing through the grille opening 23 is prevented from impacting on the side wall surface of the rear shell 2, and urea droplets in the mixed airflow are prevented from depositing on the side wall surface to form urea crystals.
When the urea spraying device is actually used, the urea nozzles on the nozzle seat 4 spray urea liquid drops into the spraying cavity 14 to form a urea spraying line 25; one part of tail gas flow discharged by the engine is guided into the injection cavity 14 through the guide plate 5 and the air inlet 29, and the other part of the tail gas flow is dispersed into the mixing cavity 15 through the pore plate 6; the urea liquid drops in the spraying cavity 14 absorb the heat of the tail gas flow to complete the first decomposition of the urea liquid drops and form mixed gas flow, the mixed gas flow flows through the crushing plate 7 and enters the mixing cavity 15, the undecomposed urea liquid drops in the mixed gas flow impact the crushing plate 7 and are crushed into urea liquid drops with smaller particles, and the urea liquid drops further volatilize into the mixed gas flow in the mixing cavity 15 after absorbing the heat to complete the second decomposition and mixing of the urea liquid drops; the mixed gas flow in the mixing cavity 15 flows through the partition plate 11 and enters the flow guide cavity 16, urea liquid drops which are not decomposed in the mixed gas flow further break into urea liquid drops with smaller particles after impacting a grid opening 23 of the partition plate 11, the urea liquid drops further volatilize after absorbing heat and flow into the flow guide cavity 16 along with the mixed gas flow, and third decomposition and mixing of the urea liquid drops are completed; after the mixed gas flow in the flow guide cavity 16 passes through the waist part 26 of the rear shell 2, the mixed gas flow is accelerated and forms rotational flow, the mixing path is prolonged, the volatilization and mixing time of urea liquid drops is prolonged, the urea liquid drops further absorb heat to volatilize into the gas flow, after the third decomposition and mixing of the urea liquid drops are completed, the mixed gas flow is further uniformly mixed and then is output through the gas outlet 8 for subsequent treatment. The exhaust gas stream is divided several times in the internal cavity 13 according to the inventionThe urea dropping liquid is fully decomposed, the decomposed ammonia gas is fully mixed with the tail gas, the mixing uniformity is high, and NO is generatedXThe conversion rate is high.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.
Claims (10)
1. The utility model provides a urea mixing arrangement, forms inside cavity (13) between preceding shell (1) and back shell (2), and preceding shell (1) upper portion has an air inlet section of thick bamboo (3), the lower part has gas outlet (8), its characterized in that: a partition plate (11) is arranged between the front shell (1) and the rear shell (2), a crushing plate (7) is fixed on the partition plate (11), and the partition plate (11) and the crushing plate (7) divide an inner cavity (13) into a spraying cavity (14) which is positioned inside the partition plate (11) and outside the crushing plate (7), a mixing cavity (15) which is positioned between the crushing plate (7) and the partition plate (11) and a flow guide cavity (16) which is positioned outside the partition plate (11);
a front baffle (9) is arranged at the front end part of the partition plate (11), an opening (24) is formed in the front baffle (9) corresponding to the partition plate (11), a guide plate (5) and a pore plate (6) are arranged on the opening (24), and an air inlet (29) is formed between the outer side edge of the guide plate (5) and the inner wall surface corresponding to the front shell (1); a first opening (17) and a second opening (18) are formed in the guide plate (5), and blades (19) which are opened inwards towards the spraying cavity (14) are arranged on the second opening (18); the pore plate (6) is provided with a plurality of first through holes (20);
a grating opening (23) is formed in the wall surface, opposite to the crushing plate (7), of the partition plate (11);
the longitudinal middle part of the rear shell (2) is inwards concave towards the inner cavity (13) to form a waist-contracting part (26).
2. Urea mixing plant according to claim 1, characterized in that: a pit (12) is formed on the outer surface of the upper part of the rear shell (2) in an inward concave manner, a nozzle seat (4) is arranged on the bottom surface of the pit (12), and a urea nozzle is arranged on the nozzle seat (4); a shielding plate (10) is fixedly arranged on the inner wall surface of the rear shell (2) corresponding to the pit (12), and the shielding plate (10) shields the periphery of the nozzle seat (4) on one side of the air inlet cylinder (3).
3. Urea mixing plant according to claim 2, characterized in that: the shielding plate (10) is located inside the air inlet (29).
4. Urea mixing plant according to claim 2, characterized in that: the shielding plate (10) is in a U shape with one end open and one end closed.
5. Urea mixing plant according to claim 1, characterized in that: the clapboard (11) is U-shaped and comprises a circular arc section (27) and a parallel section (28); the front baffle (9) is correspondingly provided with a U-shaped opening (24).
6. Urea mixing device according to claim 1 or 4, characterized in that: the guide plate (5) is a square plate and is correspondingly arranged on the front side of the parallel section (28) of the partition plate (11); the opening of the blade (19) on the guide plate (5) is opposite to the crushing plate (7).
7. Urea mixing device according to claim 1 or 4, characterized in that: the pore plate (6) is a semi-circular arc plate and is correspondingly arranged on the front side of the circular arc section (27) of the partition plate (11).
8. Urea mixing plant according to claim 1, characterized in that: the crushing plate (7) is an arc-shaped plate, and the arc shape of the crushing plate is convex towards the direction of the arc section (27) of the partition plate (11).
9. Urea mixing plant according to claim 1, characterized in that: the two outer sides of the crushing plate (7) corresponding to the partition plate (11) are respectively provided with a groove (22).
10. Urea mixing plant according to claim 1, characterized in that: the wall surface of the arc section (27) of the clapboard (11) corresponding to one side of the diversion cavity (16) is provided with a plurality of grid openings (23) which are arranged in an array.
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| CN201911315003.3A CN110848007B (en) | 2019-12-19 | 2019-12-19 | Urea mixing device |
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| CN113914976A (en) * | 2021-11-15 | 2022-01-11 | 一汽解放汽车有限公司 | Engine and aftertreatment mixer thereof |
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| CN110848007B (en) | 2024-06-25 |
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