CN114278416A - High-efficient anti-crystallization urea mixing device - Google Patents
High-efficient anti-crystallization urea mixing device Download PDFInfo
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- CN114278416A CN114278416A CN202210109540.8A CN202210109540A CN114278416A CN 114278416 A CN114278416 A CN 114278416A CN 202210109540 A CN202210109540 A CN 202210109540A CN 114278416 A CN114278416 A CN 114278416A
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- Prior art keywords
- tube
- cyclone
- air inlet
- cyclone tube
- nozzle base
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000004202 carbamide Substances 0.000 title claims abstract description 45
- 238000002156 mixing Methods 0.000 title claims abstract description 19
- 238000002425 crystallisation Methods 0.000 title claims abstract description 16
- 230000008025 crystallization Effects 0.000 claims abstract description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 15
- 239000007789 gas Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 239000008187 granular material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a high-efficiency anti-crystallization urea mixing device, which belongs to the post-treatment of diesel engine tail gas and comprises a cylinder body, a cyclone tube, a nozzle base, a tube, a right end cover and a plugging cover, the upper end of the cylinder body is provided with a nozzle base, the nozzle base is provided with a first through hole, a cyclone tube is transversely fixed in the cylinder body, a plug cover is arranged at the air inlet end of the cyclone tube, a fourth end cover is arranged at the air outlet end of the cyclone tube, a cyclone fin and a third through hole are arranged at the outer side of the air inlet end of the cyclone tube, the nozzle base is connected with the middle part of the cyclone tube through a tube, one end of the tube close to the nozzle base is provided with a second through hole, the air inlet end of cyclone tube sets up in the air inlet department of barrel, and the air inlet pipe diameter of cyclone tube is less than the air inlet pipe diameter of barrel, the cavity is formed with the outer wall of cyclone tube, the inner wall of barrel and the outer wall of pipe to the fourth end cover. The invention can uniformly mix exhaust gas and ammonia gas, prevent urea crystallization and ensure that SCR can work efficiently and stably.
Description
Technical Field
The invention relates to a high-efficiency anti-crystallization urea mixing device, belonging to the post-treatment of diesel engine tail gas.
Background
As the national emission standard of the tail gas pollutants of the diesel vehicle is developed to the sixth European stage, the stricter emission standard has stricter definition on the tail gas pollutants. The SCR (selective catalytic reduction converter) technology has become the first choice of various large main engine plants in China. The principle of the SCR technology is that NH3 generated by urea decomposition is reacted with NOx to generate N2 under the action of a catalyst, so that NOx in exhaust gas is reduced, and the exhaust gas is treated to meet the emission standard of Europe six.
The mixer is usually arranged before the SCR, and the DOC and the DPF are arranged at the rear end, namely a DOC-DPF-mixer-SCR series structure is formed. Exhaust gas is discharged into the atmosphere from DOC → DPF → mixer → SCR. The main effect of blender is let exhaust and urea granule homogeneous mixing, breaks into littleer urea granule with urea nozzle spun urea aqueous solution, prevents urea aqueous solution crystallization, and the conversion efficiency of SCR is improved to the even SCR carrier terminal surface of taking to of atomizing ammonia simultaneously. How to reduce the low-temperature crystallization of urea and evenly bring ammonia to the end face of an SCR carrier becomes a key link in the SCR technology. The existing structure has the problems of easy crystallization of urea, uneven ammonia mixing, overlarge exhaust back pressure of the mixer structure, overlarge size of the mixer and the like.
Disclosure of Invention
The invention aims to overcome the defects and provide the mixer device which has good urea distribution uniformity and is difficult to crystallize. The device can ensure that urea can evenly distributed at the SCR carrier terminal surface, makes exhaust and ammonia homogeneous mixing, prevents the production of urea crystallization, ensures that SCR can high-efficient stable work. Meanwhile, the size of the hybrid structure is small, and the hybrid structure meets the strict boundary requirement of the whole vehicle on the packaging structure.
According to the technical scheme provided by the invention, the high-efficiency anti-crystallization urea mixing device comprises a cylinder body, a cyclone tube, a nozzle base, a tube, a third end cover and a blocking cover, the upper end of the cylinder body is provided with a nozzle base, the nozzle base is provided with a first through hole, a cyclone tube is transversely fixed in the cylinder body, a plug cover is arranged at the air inlet end of the cyclone tube, a fourth end cover is arranged at the air outlet end of the cyclone tube, a cyclone fin and a third through hole are arranged at the outer side of the air inlet end of the cyclone tube, the nozzle base is connected with the middle part of the cyclone tube through a tube, one end of the tube close to the nozzle base is provided with a second through hole, the air inlet end of the cyclone tube is arranged at the air inlet of the barrel, the pipe diameter of the air inlet end of the cyclone tube is smaller than that of the air inlet of the barrel, and the fourth end cover and the outer wall of the cyclone tube, the inner wall of the barrel and the outer wall of the tube form a cavity.
As a further improvement of the invention, the cyclone tube is fixed on the inner wall of the cylinder body through a third end cover.
As a further improvement of the invention, the pipe diameter of the air inlet end of the cyclone pipe is smaller than that of the air outlet end of the cyclone pipe, and the bottom end of the cyclone pipe is arranged to be inclined downwards.
As a further improvement of the invention, the bottom of the right end cover is provided with an opening, and the opening is communicated with the air outlet end of the cyclone tube and the cavity.
As a further improvement of the invention, a first end cover is arranged between the nozzle base and the cylinder body.
As a further improvement of the invention, the top end of the tube is fixed with the first end cover, and the lower part of the tube is connected with the cyclone tube through the second end cover.
As a further improvement of the invention, the swirl fins are arranged at the third through holes, and the swirl fins 7-1 and the third through holes are uniformly distributed on the outer wall of the swirl tube.
As a further improvement of the invention, the second through holes are uniformly distributed on the outer wall of the tube.
The invention has the beneficial effects that:
1. the structure similar to a tee joint is adopted, exhaust gas and urea enter from different areas to form secondary mixed flow, and the purpose of full mixing reaction is achieved;
2. the conical rotational flow provides a rotational flow effect and ensures that the mixed gas is uniformly distributed on the front end face of the SCR;
3. the exhaust airflow outside the conical rotational flow keeps the temperature, so that the temperature in the main reaction chamber is stabilized, and the crystallization risk is reduced;
4. the air outlet end of the cyclone tube is provided with an opening communicated with waste gas, accumulated urea crystals are discharged in time, and the risk of blockage is discharged.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an exploded view of the present invention.
Fig. 3 is a left side view of fig. 1.
Fig. 4 is a right side view of fig. 1.
Description of reference numerals: 1. a nozzle base; 1-1, a first through hole; 2. a first end cap; 3. a barrel; 4. a tube; 4-1, a second through hole; 5. a second end cap; 6. blocking the cover; 7. a swirl tube; 7-1, swirl fins; 7-2 third through holes; 7-3, an air inlet end; 7-4, an air outlet end; 8. a third end cap; 9. a fourth end cap; 9-1, opening; 10. a cavity.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
as shown in the figure, the high-efficiency anti-crystallization urea mixing device comprises a cylinder 3, a cyclone tube 7, a nozzle base 1, a tube 4, a third end cover 9 and a blocking cover 6, wherein the nozzle base 1 is arranged at the upper end of the cylinder 3, a first through hole 1-1 is formed in the nozzle base 1, the cyclone tube 7 is transversely fixed in the cylinder 3, the blocking cover 6 is arranged at the air inlet end 7-3 of the cyclone tube 7, and the blocking cover 6 is welded with the cyclone tube 7 to seal the through hole at the left side of the cyclone tube 7; a fourth end cover 9 is arranged at an air outlet end 7-4 of the cyclone tube 7, a cyclone fin 7-1 and a third through hole 7-2 are arranged at the outer side of an air inlet end 7-3 of the cyclone tube 7, the nozzle base 1 is connected with the middle of the cyclone tube 7 through a tube 4, a second through hole 4-1 is formed in one end, close to the nozzle base 1, of the tube 4, the air inlet end 7-3 of the cyclone tube 7 is arranged at an air inlet of the barrel 3, the pipe diameter of the air inlet end 7-3 of the cyclone tube 7 is smaller than the pipe diameter of an air inlet of the barrel 3, and a cavity 10 is formed by the fourth end cover 9, the outer wall of the cyclone tube 7, the inner wall of the barrel 3 and the outer wall of the tube 4.
The cyclone tube 7 is fixed on the inner wall of the barrel 3 through the third end cover 8, and the third end cover 8 plays a role in supporting the cyclone tube 7, so that the reliability of the cyclone tube is improved; third end cover 8 makes to have very big clearance 8-1 between cyclone tube 7 and the barrel 3, and the air current enters into cyclone tube 7 inside back, and partial air current passes through clearance 8-1, fills cyclone tube 7's outside, and inside barrel 3, this partial air current can play the effect of heat preservation cyclone tube 7, can play the effect that reduces the inside urea crystallization risk of cyclone tube 7 like this.
The pipe diameter of the air inlet end 7-3 of the cyclone pipe 7 is smaller than that of the air outlet end 7-4 of the cyclone pipe 7, the bottom end of the cyclone pipe 7 is arranged to be inclined downwards, and the arrangement can enable urea crystallized inside to flow to the air outlet end of the cyclone pipe 7; the bottom of the fourth cover 9 is provided with an opening 9-1, the opening 9-1 is communicated with the air outlet end 7-4 of the chamber 10 and the cyclone tube 7, the fourth cover 9 can prevent air flow from directly flowing out of the barrel 3 after passing through the gap 8-1, air flow in part of the barrel 3 can flow out of the opening 9-1, urea flowing out of the cyclone tube 7 and falling onto the barrel 3 is swept, and the urea is prevented from being accumulated and crystallized for a long time.
Be provided with first end cover 2 between nozzle base 1 and the barrel 3, the top and the first end cover 2 of pipe 4 are fixed, are connected through second end cover 5 between the lower part of pipe 4 and cyclone tube 7.
The rotational flow fins 7-1 are arranged at the third through holes 7-2, the rotational flow fins 7-1 and the third through holes 7-2 are uniformly distributed on the outer wall of the rotational flow tube 7, and the directions of the rotational flow fins and the outer tangent plane of the rotational flow tube 7 keep the same angle, so that the rotational flow effect is stabilized.
The second through holes 4-1 are uniformly distributed on the outer wall of the tube 4.
The working process and principle of the invention are as follows:
exhaust flows into the mixed structure from the left side after passing through the DOC-DPF carrier component of the previous-stage structure, exhaust airflow firstly enters the barrel 3 shown in the figure 1, then most of the exhaust flows enter the cyclone tube 7 from the cyclone fin 7-1 and the third through hole 7-2 arranged on the cyclone tube 7, and the cyclone fin 7-1 can play a role in rotating the exhaust flow. A small portion of the air flow in the chamber 10 enters the interior of the tube 4 through a small second through hole 4-1 in the tube 4. Urea passes through first through-hole 1-1 in the middle of the nozzle base 1, sprays and enters into the inside of pipe 4 to the pyrolytic reaction begins to take place, and at the inside beginning of urea entering pipe 4, urea just constantly evaporates, takes place pyrolytic reaction, and the urea granule diminishes gradually, this is a mixed reaction.
Then, the urea particles with smaller particles enter the cyclone tube 7, and the main exhaust gas flow and the urea particles are mixed and reacted in the cyclone tube 7, so that the evaporation and pyrolysis of the urea are further promoted to generate ammonia. The mixed gas of urea and exhaust gas then flows out through the right side of the swirl tube 7. Through spiral-flow tube 7, the mixture of urea granule and air current is more abundant, and rotatory air current can increase the time of urea pyrolysis, fully improves the efficiency of pyrolysis, promotes the ammonia and mixes the effect, reduces urea and here produces the risk of crystallization, and this is the secondary mixing reaction.
There is very big clearance 8-1 between third end cover 8 and the barrel 3, and the air current enters into the inside back of blender, and partial air current fills in cavity 10 through clearance 8-1, and this partial air current can play the effect of heat preservation cyclone tube 7, can play the effect that reduces 7 inside urea crystallization risks like this.
As shown in FIG. 4, the end cap 9 can prevent the gas flow from diametrically flowing out of the mixer after passing through the gap 8-1, and the lower end of the end cap 9 is provided with an opening 9-1, so that part of the gas flow can flow out of the opening 9-1 to purge the urea which flows out of the cyclone tube 7 and falls onto the cylinder 3, and prevent the urea from accumulating and crystallizing for a long time.
Claims (8)
1. A high-efficiency anti-crystallizing urea mixing device comprises a barrel (3), a cyclone tube (7), a nozzle base (1), a tube (4), a third end cover (9) and a plug cover (6), and is characterized in that the upper end of the barrel (3) is provided with the nozzle base (1), the nozzle base (1) is provided with a first through hole (1-1), the inside of the barrel (3) is transversely fixed with the cyclone tube (7), the air inlet end (7-3) of the cyclone tube (7) is provided with the plug cover (6), the air outlet end (7-4) of the cyclone tube (7) is provided with a fourth end cover (9), the outer side of the air inlet end (7-3) of the cyclone tube (7) is provided with a cyclone fin (7-1) and a third through hole (7-2), the nozzle base (1) is connected with the middle part of the cyclone tube (7) through the tube (4), the one end that pipe (4) are close to nozzle base (1) is provided with second through-hole (4-1), the air inlet end (7-3) of whirl pipe (7) set up in the air inlet department of barrel (3), and the pipe diameter of air inlet end (7-3) of whirl pipe (7) is less than the air inlet pipe diameter of barrel (3), fourth end cover (9) and the outer wall of whirl pipe (7), the inner wall of barrel (3) and the outer wall of pipe (4) form cavity (10).
2. The mixing device of claim 1, wherein the cyclone tube (7) is fixed on the inner wall of the cylinder (3) through a third end cover (8).
3. The high-efficiency anti-crystallizing urea mixing device according to claim 1, wherein the pipe diameter of the air inlet end (7-3) of the cyclone pipe (7) is smaller than that of the air outlet end (7-4) of the cyclone pipe (7), and the bottom end of the cyclone pipe (7) is arranged to be inclined downwards.
4. The efficient anti-crystallizing urea mixing device as recited in claim 1, characterized in that the bottom of the right end cap (9) is provided with an opening (9-1), and the opening (9-1) is communicated with the chamber (10) and the air outlet end (7-4) of the cyclone tube (7).
5. A highly efficient anti-crystallizing urea mixing device as described in claim 1, characterized by that a first end cap (2) is arranged between the nozzle base (1) and the cylinder (3).
6. The mixing device for urea with high crystallization resistance as claimed in claim 5, wherein the top end of the tube (4) is fixed with the first end cap (2), and the lower part of the tube (4) is connected with the cyclone tube (7) through the second end cap (5).
7. The efficient anti-crystallizing urea mixing device as recited in claim 1, wherein the swirl fins (7-1) are disposed at the third through holes (7-2), and the swirl fins (7-1) and the third through holes (7-2) are uniformly distributed on the outer wall of the swirl tube (7).
8. A highly efficient anti-crystallizing urea mixing device as described in claim 1, wherein said second through holes (4-1) are uniformly distributed on the outer wall of the tube (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210109540.8A CN114278416A (en) | 2022-01-28 | 2022-01-28 | High-efficient anti-crystallization urea mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210109540.8A CN114278416A (en) | 2022-01-28 | 2022-01-28 | High-efficient anti-crystallization urea mixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114278416A true CN114278416A (en) | 2022-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210109540.8A Pending CN114278416A (en) | 2022-01-28 | 2022-01-28 | High-efficient anti-crystallization urea mixing device |
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| CN (1) | CN114278416A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104912A (en) * | 2016-11-25 | 2018-06-01 | 天纳克（苏州）排放系统有限公司 | Tail-gas after treatment apparatus |
| CN207686809U (en) * | 2017-12-23 | 2018-08-03 | 无锡威孚力达催化净化器有限责任公司 | A kind of swirl vane integrates mixing arrangement with clam shell |
| CN208396786U (en) * | 2017-12-31 | 2019-01-18 | 无锡威孚力达催化净化器有限责任公司 | A kind of horizontal mixing arrangement of cyclone pipe for spar-type platforms |
| KR101950601B1 (en) * | 2017-09-11 | 2019-02-22 | 대지금속 주식회사 | Mixing chamber unit for exhaust gas cleaning device |
| CN110273734A (en) * | 2019-07-25 | 2019-09-24 | 无锡威孚力达催化净化器有限责任公司 | A kind of bidirectional rotational flow cartridge type urea mixing device |
| CN111927602A (en) * | 2020-08-18 | 2020-11-13 | 无锡威孚力达催化净化器有限责任公司 | Mixing device with double cyclone tube cross devices |
-
2022
- 2022-01-28 CN CN202210109540.8A patent/CN114278416A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104912A (en) * | 2016-11-25 | 2018-06-01 | 天纳克（苏州）排放系统有限公司 | Tail-gas after treatment apparatus |
| KR101950601B1 (en) * | 2017-09-11 | 2019-02-22 | 대지금속 주식회사 | Mixing chamber unit for exhaust gas cleaning device |
| CN207686809U (en) * | 2017-12-23 | 2018-08-03 | 无锡威孚力达催化净化器有限责任公司 | A kind of swirl vane integrates mixing arrangement with clam shell |
| CN208396786U (en) * | 2017-12-31 | 2019-01-18 | 无锡威孚力达催化净化器有限责任公司 | A kind of horizontal mixing arrangement of cyclone pipe for spar-type platforms |
| CN110273734A (en) * | 2019-07-25 | 2019-09-24 | 无锡威孚力达催化净化器有限责任公司 | A kind of bidirectional rotational flow cartridge type urea mixing device |
| CN111927602A (en) * | 2020-08-18 | 2020-11-13 | 无锡威孚力达催化净化器有限责任公司 | Mixing device with double cyclone tube cross devices |
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