CN110748402A - U-shaped post-processor urea mixing device - Google Patents
U-shaped post-processor urea mixing device Download PDFInfo
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- CN110748402A CN110748402A CN201911239655.3A CN201911239655A CN110748402A CN 110748402 A CN110748402 A CN 110748402A CN 201911239655 A CN201911239655 A CN 201911239655A CN 110748402 A CN110748402 A CN 110748402A
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- Prior art keywords
- end cover
- cyclone
- mixing device
- axial
- shaped
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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
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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
- 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 belongs to the technical field of diesel engine tail gas aftertreatment equipment, and relates to a urea mixing device of a U-shaped aftertreatment device, which comprises an upper end cover and a lower end cover which are connected with each other; the upper part of the cyclone tube assembly is arranged in the upper end cover, the lower part of the cyclone tube assembly penetrates out of the upper end cover and extends into the lower end cover, and the upper end part of the cyclone tube assembly extends out of the upper hole of the upper end cover; the axial end of the upper end cover is closed, the other end of the upper end cover is opened, the axial end of the lower end cover is closed, the other end of the lower end cover is opened, and a rotational flow plate is arranged at the opening end of the cavity of the lower end cover to form rotational flow. The mixing device adopts the matching use of the rotational flow structure and the wire mesh weaving unit to carry out the crushing and decomposition of urea, thereby reducing the crystallization risk of urea; meanwhile, the distribution uniformity of urea and NH3 on the front end face of the SCR catalyst is improved by adopting a slotted hole pipe and a rotational flow plate structure.
Description
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment equipment, and relates to a urea mixing device of a U-shaped aftertreatment device.
Background
In the application technology of the SCR system, the key in the whole process is how to uniformly mix the injected urea and the engine exhaust gas and complete the secondary crushing of the urea and reduce the crystallization risk of the urea at the position of a mixer. The U-shaped after-treatment device is used as a key component of an after-treatment system of a commercial vehicle in the six-emission stage of China, and a urea mixing device of the U-shaped after-treatment device is not mature.
The common mixing units mostly use fin structures or fiber units to achieve the crushing. The fin structure is limited in urea crushing effect due to the fact that the fin structure is large in machining difficulty of micro fins and the like. In recent years, the problem of urea crushing and crystallization is also solved by adopting a cyclone structure, but when the cyclone structure is applied to U-shaped aftertreatment, the rotating airflow direction is perpendicular to the airflow direction in the SCR catalyst, so that the distribution uniformity of NH3 on the end face of the SCR catalyst is difficult to ensure. Meanwhile, the urea is difficult to decompose quickly due to the limited breaking capacity of the rotational flow structure on the urea.
Disclosure of Invention
Aiming at the problems, the invention provides a urea mixing device of a U-shaped post-processor, which adopts a rotational flow structure and a wire mesh weaving unit to be matched for use to crush and decompose urea, thereby reducing the risk of urea crystallization; meanwhile, the distribution uniformity of urea and NH3 on the front end face of the SCR catalyst is improved by adopting a slotted hole pipe and a rotational flow plate structure.
According to the technical scheme of the invention: the utility model provides a U type aftertreatment ware urea mixing arrangement which characterized in that: comprises an upper end cover and a lower end cover which are connected with each other;
the upper part of the cyclone tube assembly is arranged in the upper end cover, the lower part of the cyclone tube assembly penetrates out of the upper end cover and extends into the lower end cover, and the upper end part of the cyclone tube assembly extends out of the upper hole of the upper end cover;
the axial end of the upper end cover is closed, the other end of the upper end cover is opened, the axial end of the lower end cover is closed, the other end of the lower end cover is opened, and a rotational flow plate is arranged at the opening end of the cavity of the lower end cover to form rotational flow.
As a further improvement of the invention, the cyclone tube assembly comprises cyclone tubes with guide vanes uniformly distributed on the circumferential surface, the axial inlet ends of the cyclone tubes are provided with nozzle bases, the axial outlet ends of the cyclone tubes are connected with hole tubes with a plurality of holes on the surface, and the axial other ends of the hole tubes are provided with plugging covers.
As a further improvement of the invention, the surface of the hole pipe is provided with a notch, and the notch faces to one side of the air outlet hole of the lower end cover.
As a further improvement of the invention, the axial outlet end of the cyclone tube is connected with a wire mesh unit, the lower end of the wire mesh unit is fastened with a connecting tube, the outlet end of the connecting tube is connected with an upper V-shaped flange, the axial inlet end of the hole tube is connected with a lower V-shaped flange, and the upper V-shaped flange and the lower V-shaped flange are locked and connected through a connecting hoop.
As a further improvement of the invention, the cyclone tube is arranged in the upper end cover, and the hole tube is arranged in the lower end cover.
As a further improvement of the invention, a flow guide pipe (5-1) is arranged in the center of the rotational flow plate (5), a circle of wind scooper is arranged on the rotational flow plate corresponding to the outer side of the flow guide pipe, and a plurality of through holes are arranged on the outer ring of the wind scooper.
As a further improvement of the invention, the air outlet of the air guide cover is parallel to the surface of the rotational flow plate.
As a further improvement of the invention, the upper end cover and the lower end cover are connected by a connecting clamp in a locking way.
As a further improvement of the invention, a baffle plate is arranged at the axial opening end of the upper end cover, and an opening is arranged on the baffle plate.
The invention has the technical effects that: the mixing device in the prior art mostly adopts a stainless steel finned mixing unit, and has limited crushing effect on urea. The spiral-flow tube and the wire mesh unit are adopted to replace a fin mixer, so that the crushing effect is better;
compared with the existing mixing unit adopting fiber elements to replace stainless steel fins, the wire mesh unit has the advantages of better heat conduction effect, small heat loss and the like, and can effectively prevent the risk of urea crystallization under the working condition of low exhaust temperature;
the existing mixing device adopting the cyclone tube structure alone has the problem that the wall of the outer hole of the cyclone tube is easy to crystallize, and the average diameter of urea particles can be greatly reduced after the metal wire mesh structure is adopted;
the invention adopts a hole pipe structure with a slot in the middle, can guide the rotating airflow in the cyclone pipe to the middle position of the end surface of the SCR catalyst, and then utilizes the cyclone plate to fully mix urea, thereby greatly improving the mixing uniformity of urea;
although the swirl plate structure has good functions of rotating and mixing urea, strong swirl easily causes the urea to be thrown to the edge of the SCR catalyst under the action of centrifugal force, so that the concentration of the urea at the middle position is lower. The cyclone plate structure with the middle part provided with the conical hole can greatly improve the condition that urea at the middle position of the SCR catalyst is lower.
Drawings
FIG. 1 is an isometric view of the present invention.
Fig. 2 is a front view of the present invention.
Fig. 3 is a right side view of the present invention.
Fig. 4 is an exploded view of the present invention.
FIG. 5 is a schematic view of the swirl plate of the present invention.
FIG. 6 is a schematic view of a cyclone tube assembly of the present invention.
FIG. 7 is an exploded view of the swirl tube assembly of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the drawings 1-7, the device comprises an upper end cover 1, a cyclone tube component 2, a nozzle base 2-1, a cyclone tube 2-2, a screen unit 2-3, a connecting tube 2-4, an upper V-shaped flange 2-5, a connecting hoop 2-6, a lower V-shaped flange 2-7, a perforated tube 2-8, a plugging cover 2-9, a connecting hoop 3, a lower end cover 4, a cyclone plate 5, a flow guide tube 5-1, an air guide cover 5-2, a through hole 5-3 and the like.
As shown in fig. 1 to 3, the invention relates to a U-shaped post-processor urea mixing device, which comprises an upper end cover 1 and a lower end cover 4, wherein the upper end cover 1 and the lower end cover 4 are structurally sealed towards one end and open towards the other end, the surfaces of the upper end cover 1 and the lower end cover 4 are locked and connected through a connecting clamp 3, the upper end of a cyclone tube assembly 2 is arranged in a cavity of the upper end cover 1, the lower end of the cyclone tube assembly 2 passes through the upper end cover 1 and then extends into the lower end cover 4, the upper end of the cyclone tube assembly 2 extends out of a top hole of the upper end cover 1, and a cyclone plate 5 is welded on the inner wall of the cavity of the lower.
As shown in fig. 4, 6 and 7, the cyclone tube assembly 2 comprises cyclone tubes 2-2, the surfaces of which are uniformly provided with guide vanes, axial inlet ends of the cyclone tubes 2-2 are provided with nozzle bases 2-1, the nozzle bases 2-1 extend out from upper end holes of an upper end cover 1, axial outlet ends of the cyclone tubes 2-2 are sequentially connected with wire mesh units 2-3 and connecting tubes 2-4, and outlet ends of the connecting tubes 2-4 are fastened with V-shaped flanges 2-5; the cyclone tube component 2 further comprises a hole tube 2-8, one axial end of the hole tube 2-8 is connected with a blocking cover 2-9, the other axial end of the hole tube 2-8 is connected with a lower V-shaped flange 2-7, the upper V-shaped flange 2-5 and the lower V-shaped flange 2-7 are connected in a locking mode through a connecting hoop 2-6, and a notch is formed in the surface of the hole tube 2-8 and faces to one side of an air outlet of the lower end cover 4. The inner wall of the hoop connected with the hoops 2-6 is provided with two locking grooves which are respectively matched with the surface bulges of the lower V-shaped flange 2-7 and the upper V-shaped flange 2-5; in order to realize the effective work of the nozzle base 2-1, a through hole is arranged through the rotation center of the nozzle base 2-1. The cyclone tube 2-2 is arranged in the upper end cover 1, and the hole tube 2-8 is arranged in the lower end cover 4.
As shown in fig. 4, the air inlet end of the inner cavity of the upper end cover 1 is further provided with an air deflector, and the air deflector is provided with a gap to ensure that the inlet air is directed towards the guide vanes of the cyclone tube 2-2, so that a strong cyclone is obtained in the cyclone tube 2-2.
As shown in FIG. 5, a flow guide pipe 5-1 is arranged at the rotation center of the rotational flow plate 5, a circle of wind scoopers 5-2 are uniformly arranged on the rotational flow plate 5 corresponding to the outer side of the flow guide pipe 5-1, and the wind scoopers 5-2 are in a convex conical shell shape. The air outlet direction of the wind scooper 5-2 is flush with the surface of the rotational flow plate 5.
As shown in fig. 1 and 4, the axial opening end surface of the upper end cap 1 is provided with a threaded connection portion, and the axial opening end surface of the lower end cap 4 is provided with a threaded connection portion.
The working process of the invention is as follows: when exhaust gas discharged by an engine passes through the DPF and enters the U-shaped aftertreatment urea mixing device from the flange of the upper end cover 1, the air flow enters the cyclone tube 2-2 to form strong rotating air flow, the urea sprayed from the urea nozzle base 2-1 is driven to rotate downwards, and the urea is crushed and mixed on the metal wire mesh unit 2-3. The wire mesh has good heat-conducting property, and can keep heat for a long time, thereby greatly reducing the risk of urea crystallization caused by temperature loss under the low-temperature working condition. Meanwhile, the wire mesh units 3-3 are formed by rolling metal filaments, so that the crushing effect and the decomposition rate of urea can be greatly improved. The urea enters the hole pipe 2-8 after being crushed, and further crushing and decomposition are realized. The middle part of the hole pipe 2-8 is provided with a slotted hole which can guide airflow to be discharged from the middle position of the SCR catalyst, and then strong rotational flow in the axial direction of the SCR catalyst is formed through the rotational flow plate 5, so that the mixing uniformity of NH3 on the front end face of the SCR catalyst is improved.
Claims (9)
1. The utility model provides a U type aftertreatment ware urea mixing arrangement which characterized in that: comprises an upper end cover (1) and a lower end cover (4) which are connected with each other;
the upper part of the cyclone tube component (2) is arranged in the upper end cover (1), the lower part of the cyclone tube component penetrates through the upper end cover (1) and extends into the lower end cover (4), and the upper end part of the cyclone tube component (2) extends out of the upper hole of the upper end cover (1);
the axial end of the upper end cover (1) is closed, the other end of the upper end cover is open, the axial end of the lower end cover (4) is closed, the other end of the lower end cover is open, and a cyclone plate (5) is arranged at the opening end of the cavity of the lower end cover (4) to form cyclone.
2. The U-shaped aftertreatment urea mixing device of claim 1, wherein: the cyclone tube component (2) comprises cyclone tubes (2-2) with guide vanes uniformly distributed on the circumferential surface, nozzle bases (2-1) are arranged at the axial inlet ends of the cyclone tubes (2-2), hole tubes (2-8) with a plurality of holes are arranged on the connecting surfaces of the axial outlet ends of the cyclone tubes (2-2), and blocking covers (2-9) are arranged at the axial other ends of the hole tubes (2-8).
3. The U-shaped aftertreatment urea mixing device of claim 2, wherein: the surface of the hole pipe (2-8) is provided with a notch, and the notch faces to one side of the air outlet hole of the lower end cover (4).
4. The U-shaped aftertreatment urea mixing device of claim 2, wherein: the axial outlet end of the spiral-flow pipe (3-2) is connected with the wire mesh unit (2-3), the lower end of the wire mesh unit (2-3) is fastened with the connecting pipe (2-4), the outlet end of the connecting pipe (2-4) is connected with the upper V-shaped flange (2-5), the axial inlet end of the perforated pipe (3-8) is connected with the lower V-shaped flange (3-7), and the upper V-shaped flange (2-5) and the lower V-shaped flange (3-7) are connected in a locking mode through the connecting hoop (3-6).
5. The U-shaped aftertreatment urea mixing device of claim 2, wherein: the cyclone tube (2-2) is arranged in the upper end cover (1), and the hole tube (2-8) is arranged in the lower end cover (4).
6. The U-shaped aftertreatment urea mixing device of claim 1, wherein: the center of the rotational flow plate (5) is provided with a flow guide pipe (5-1), a circle of wind scooper (5-2) is arranged on the rotational flow plate (5) corresponding to the outer side of the flow guide pipe (5-1), and the outer ring of the wind scooper (5-2) is provided with a plurality of through holes (5-3).
7. The U-shaped aftertreatment urea mixing device of claim 6, wherein: the air outlet direction of the air guide cover (5-2) is parallel to the surface of the rotational flow plate (5).
8. The U-shaped aftertreatment urea mixing device of claim 1, wherein: the upper end cover (1) and the lower end cover (4) are connected in a locking mode through the connecting clamp (2).
9. The U-shaped aftertreatment urea mixing device of claim 1, wherein: the axial opening end of the upper end cover (1) is provided with a baffle plate, and the baffle plate is provided with an opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911239655.3A CN110748402A (en) | 2019-12-06 | 2019-12-06 | U-shaped post-processor urea mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911239655.3A CN110748402A (en) | 2019-12-06 | 2019-12-06 | U-shaped post-processor urea mixing device |
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| Publication Number | Publication Date |
|---|---|
| CN110748402A true CN110748402A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911239655.3A Pending CN110748402A (en) | 2019-12-06 | 2019-12-06 | U-shaped post-processor urea mixing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271161A (en) * | 2020-03-25 | 2020-06-12 | 无锡威孚力达催化净化器有限责任公司 | Half slot hole tubular urea mixing arrangement |
| CN111764988A (en) * | 2020-06-29 | 2020-10-13 | 东风商用车有限公司 | Aftertreatment encapsulation SCR blender unit |
| CN114320541A (en) * | 2021-11-25 | 2022-04-12 | 东风商用车有限公司 | SCR aftertreatment device |
| WO2023000397A1 (en) * | 2021-07-19 | 2023-01-26 | 无锡威孚力达催化净化器有限责任公司 | Sleeve shunt-type urea mixing device |
| CN115807707A (en) * | 2023-01-09 | 2023-03-17 | 北方稀土华凯高科技河北有限公司 | Swirl cover mixer for urea injection mixing of diesel engine |
-
2019
- 2019-12-06 CN CN201911239655.3A patent/CN110748402A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271161A (en) * | 2020-03-25 | 2020-06-12 | 无锡威孚力达催化净化器有限责任公司 | Half slot hole tubular urea mixing arrangement |
| CN111764988A (en) * | 2020-06-29 | 2020-10-13 | 东风商用车有限公司 | Aftertreatment encapsulation SCR blender unit |
| WO2023000397A1 (en) * | 2021-07-19 | 2023-01-26 | 无锡威孚力达催化净化器有限责任公司 | Sleeve shunt-type urea mixing device |
| CN114320541A (en) * | 2021-11-25 | 2022-04-12 | 东风商用车有限公司 | SCR aftertreatment device |
| CN115807707A (en) * | 2023-01-09 | 2023-03-17 | 北方稀土华凯高科技河北有限公司 | Swirl cover mixer for urea injection mixing of diesel engine |
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