CN109488426B - Double-layer rotational flow vane type urea injection mixing unit - Google Patents
Double-layer rotational flow vane type urea injection mixing unit Download PDFInfo
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- CN109488426B CN109488426B CN201910079681.8A CN201910079681A CN109488426B CN 109488426 B CN109488426 B CN 109488426B CN 201910079681 A CN201910079681 A CN 201910079681A CN 109488426 B CN109488426 B CN 109488426B
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- Prior art keywords
- swirl
- hole pipe
- mixing unit
- air outlet
- urea
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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]
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a double-layer swirl vane type urea injection mixing unit which comprises a urea nozzle assembly, a cover plate, a swirl inner hole pipe, a swirl outer hole pipe, a bottom cover and a connecting ring plate, wherein the urea nozzle assembly is fixed on the cover plate, the cover plate is welded at one end of the swirl inner hole pipe, a plurality of swirl vanes and a first air outlet hole array are respectively arranged at two ends of the swirl inner hole pipe, an inner mixing cavity is formed in the middle of the swirl inner hole pipe, the bottom cover is welded and fixed at one end of the swirl outer hole pipe, the other end of the swirl inner hole pipe is fixedly connected to the swirl inner hole pipe through the connecting ring plate, the first air outlet hole array is arranged in an outer mixing cavity formed by the bottom cover, the connecting ring plate and the swirl outer hole pipe, and a second air outlet hole array is formed in the swirl outer hole pipe. The double-layer swirl vane type urea injection mixing unit is simple and compact in structure and ingenious in design; the urea mixing path is lengthened, and the urea mixing evaporation effect is improved; the risk of urea crystallization is reduced.
Description
Technical Field
The invention belongs to the technology of diesel engine tail gas treatment, and particularly relates to a double-layer rotational flow vane type urea injection mixing unit for diesel engine tail gas treatment.
Background
Referring to fig. 1, fig. 1 is a schematic structural diagram of an existing urea injection mixing unit, where the existing urea injection mixing unit includes a urea nozzle 10, a nozzle mounting seat 11, a cover plate 12 and a swirl hole pipe 13, the urea nozzle 10 is assembled on the nozzle mounting seat 11, one end opening of the swirl hole pipe 13 is closed by the cover plate 12 after the nozzle mounting seat 11 and the cover plate 12 are welded into a whole, the other end of the swirl hole pipe 13 is an open end, two ends of the swirl hole pipe 13 are respectively provided with a plurality of air inlet holes 14 and a plurality of air outlet holes 15, and a plurality of swirl blades 16 are arranged on a part of the swirl hole 13 close to the air inlet holes 14. During operation, waste gas enters the cyclone hole pipe 4 through the openings of the cyclone blades 15 of the cyclone hole pipe 13 and the air inlet holes 14, is rotationally mixed with urea injected by the urea nozzle 10, flows out through the openings of the cyclone hole pipe 4 and the air outlet holes 16, and enters the SCR carrier.
The key technology of SCR system is NH 3 And the mixing uniformity with the waste gas reduces the risk of urea crystallization. Existing mixer NH 3 The mixing path is short, the uniformity of mixing is too low, the crystallization risk is large, resulting in NO X The conversion efficiency is low.
Disclosure of Invention
The invention aims to provide a double-layer rotational flow vane type urea injection mixing unit, which is used for solving the problems of short mixing path, low mixing uniformity and high crystallization risk of the urea injection mixing unit in the prior art.
To achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a double-deck whirl vane type urea sprays mixing element, its includes urea nozzle, nozzle mount pad, apron, whirl inner hole pipe, whirl outer hole pipe, bottom and go-between, the urea nozzle assembles on the nozzle mount pad, the nozzle mount pad is fixed in on the apron, the apron welds in the one end of whirl inner hole pipe and seals this end opening, the other end of whirl inner hole pipe is the open end, just the both ends of whirl inner hole pipe are provided with a plurality of whirl blade and first venthole array respectively, form the opening between whirl blade and the whirl inner hole pipe, the part that lies in between whirl blade and the first venthole array on the whirl inner hole pipe forms interior mixing cavity, wherein, the one end welded fastening bottom of whirl outer hole pipe, the other end is through go-between fixed connection on the whirl inner hole pipe, first venthole array is arranged in the outer mixing cavity that bottom, go-between and whirl outer hole pipe formed, just the second venthole array has been seted up on the outer hole pipe.
Particularly, the cross section of the bottom cover is in a circular arc structure, and the bottom cover is spaced from the opening end of the cyclone inner hole pipe.
Particularly, the bottom cover is welded and fixed in the cyclone outer hole pipe, and a step part which is arranged corresponding to the position of the first air outlet hole array is formed at the welding position of the bottom cover and the cyclone outer hole pipe.
Particularly, a plurality of auxiliary air inlets are formed in the connecting ring plate.
In particular, the first air outlet hole array and the second air outlet hole array are distributed in a staggered mode.
Particularly, an air inlet hole array is arranged on the cyclone inner hole pipe at a position between the cyclone blade and the cover plate.
Particularly, the first air outlet hole array and the second air outlet hole array are all round holes, and the whole width of the first air outlet hole array is not larger than that of the second air outlet hole array.
Particularly, the auxiliary air inlets are circular arc-shaped holes, and all the auxiliary air inlets are uniformly distributed on the same circumference of the connecting annular plate.
Compared with the prior art, the double-layer swirl vane type urea injection mixing unit has the following advantages:
1) The structure is simple and compact, and the design is ingenious;
2) The outer mixing cavity formed by the rotational flow outer hole pipe, the bottom cover and the connecting ring plate is additionally arranged outside the rotational flow inner hole pipe, so that the urea mixing path is prolonged, and the urea mixing evaporation effect is improved;
3) The auxiliary air inlet hole on the connecting annular plate is matched with the first air outlet hole array on the cyclone inner hole pipe, so that air flow and urea are promoted to be mixed for multiple times, and meanwhile, the air flow blows to the easy aggregation point of the urea, so that the crystallization risk of the urea is reduced;
4) The auxiliary air inlet holes on the connecting ring plate can split partial waste gas and reduce the back pressure of the mixer.
Drawings
FIG. 1 is a schematic diagram of a prior art urea injection mixing unit;
FIG. 2 is a schematic perspective view of a double-layer swirl vane type urea injection mixing unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the internal structure of a double-layer swirl vane type urea injection mixing unit provided in an embodiment of the invention;
FIG. 4 is a cross-sectional view of a dual-layer swirl vane urea injection mixing unit provided by an embodiment of the invention.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 2 to 4, in this embodiment, a dual-layer swirl vane type urea injection mixing unit includes a urea nozzle 20, a nozzle mounting seat 21, a cover plate 22, a swirl inner hole pipe 23, a swirl outer hole pipe 24, a bottom cover 25 and a connecting ring plate 26, wherein the urea nozzle 20 is assembled on the nozzle mounting seat 21, the nozzle mounting seat 21 is welded and fixed on the outer side surface of the cover plate 22, the other side surface of the cover plate 22 is welded and fixed on one end of the swirl inner hole pipe 23 to seal the opening of the end, the other end of the swirl inner hole pipe 23 is an open end, two ends of the swirl inner hole pipe 23 are respectively provided with 6-12 swirl vanes 27 and a first air outlet hole array 28, openings are formed between the swirl vanes 27 and the swirl inner hole pipe 23, an air inlet hole array 29 is formed between the swirl vanes 27 and the cover plate 22 on the swirl inner hole pipe 23, the first air outlet hole array 28 is positioned at the open end of the swirl inner hole pipe 23 and comprises 2-6 rows of circular holes, the air inlet hole array 29 comprises 1-2 rows of strip holes, and the part of the swirl inner hole pipe 23 positioned between the swirl vanes 27 and the first air outlet hole array 28 forms an inner mixing cavity 30.
One end of the cyclone outer hole pipe 24 is welded and fixed with a bottom cover 25, the other end of the cyclone outer hole pipe 24 is fixedly connected to the cyclone inner hole pipe 23 through a connecting ring plate 26, the cross section of the bottom cover 25 is of a circular arc structure, the bottom cover 25 and the opening end of the cyclone inner hole pipe 23 are provided with intervals, the bottom cover 25 is welded and fixed in the cyclone outer hole pipe 24, a step part 31 corresponding to the position of the first air outlet hole array 28 is formed at the welding position of the bottom cover 25, four circular arc auxiliary air inlets 32 are uniformly formed on the same circumference of the connecting ring plate 26, the first air outlet hole array 28 is arranged in an outer mixing cavity 33 formed by the bottom cover 25, the connecting ring plate 26 and the cyclone outer hole pipe 24, a second air outlet hole array 34 is formed on the cyclone outer hole pipe 24, the second air outlet hole array 34 adopts 4-12 rows of circular holes, the first air outlet hole array 28 and the second air outlet hole array 34 are distributed in a staggered mode, namely the second air outlet hole array 34 is arranged at the position corresponding to the inner mixing cavity 30, and the whole width of the second air outlet hole array 34 is larger than the whole width of the first air outlet hole array 28.
When the diesel engine works, most of waste gas generated by the diesel engine enters the inner mixing cavity 30 in the cyclone inner hole pipe 23 through the opening of the cyclone blade 27 on the right side of the cyclone inner hole pipe 23, strong rotation is generated through the action of the cyclone blade 27, the urea solution is sprayed to the center of the cyclone air flow by the urea nozzle 20, the urea solution is quickly mixed with the air flow, meanwhile, the urea solution can be prevented from being sprayed to the wall surface of the cyclone inner hole pipe 23, the risk of urea crystallization is reduced, most of mixed air flows out from the opening end of the cyclone inner hole pipe 23 and impacts on the circular arc bottom cover 25, then enters the outer mixing cavity 33 in the middle of the cyclone inner hole pipe 23 and the cyclone inner hole pipe 24, and a small part of mixed air flows into the outer mixing cavity 33 through the first air outlet hole array 28 of the cyclone inner hole pipe 23 and impacts the step part 31 of the bottom cover 25 and the cyclone outer hole pipe 24, so that urea is prevented from accumulating and crystallizing. Meanwhile, a small part of exhaust gas generated by the diesel engine enters an outer mixing cavity 33 between the rotational flow outer hole pipe 24 and the rotational flow inner hole pipe 23 through an auxiliary air inlet hole 32 on the connecting annular plate 26, and flows out through a second air outlet hole array 34 on the rotational flow outer hole pipe 24 after being mixed with the two mixed gases again and enters the SCR carrier.
The double-layer rotational flow vane type urea injection mixing unit promotes the air flow and urea to be mixed for a plurality of times by arranging the number and the size of the auxiliary air inlets 32 on the connecting annular plate 26 and the number and the size of the first air outlet hole arrays 28 of the rotational flow inner hole pipes 23. And by providing the number and size of auxiliary air inlet holes 32 in the connecting ring plate 26, a portion of the exhaust gas can be diverted to reduce the back pressure of the mixer.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (5)
1. The double-layer swirl vane type urea injection mixing unit comprises a urea nozzle, a nozzle mounting seat, a cover plate, a swirl inner hole pipe, a swirl outer hole pipe, a bottom cover and a connecting ring plate, wherein the urea nozzle is assembled on the nozzle mounting seat;
the bottom cover is welded and fixed in the cyclone outer hole pipe, and a step part which is arranged corresponding to the first air outlet hole array is formed at the welding position of the bottom cover and the cyclone outer hole pipe;
a plurality of auxiliary air inlets are formed in the connecting annular plate;
the auxiliary air inlets are circular arc-shaped holes, and all the auxiliary air inlets are uniformly distributed on the same circumference of the connecting annular plate;
the double-layer rotational flow vane type urea injection mixing unit promotes the air flow and urea to be mixed for a plurality of times by arranging an auxiliary air inlet hole on the connecting annular plate and a first air outlet hole array of the rotational flow inner hole pipe.
2. The double-layer swirl vane type urea injection mixing unit according to claim 1, wherein the cross section of the bottom cover is in a circular arc structure, and the bottom cover is spaced from the opening end of the swirl inner hole pipe.
3. The dual-layer swirl vane urea injection mixing unit of claim 1 wherein the first and second arrays of gas outlets are staggered.
4. The double-layer swirl vane type urea injection mixing unit according to claim 1, wherein an air inlet hole array is arranged on the swirl inner hole pipe at a position between the swirl vane and the cover plate.
5. The dual-layer swirl vane type urea injection mixing unit of claim 1, wherein the first and second arrays of air outlet holes each employ circular holes, and the overall width of the first array of air outlet holes is no greater than the overall width of the second array of air outlet holes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910079681.8A CN109488426B (en) | 2019-01-28 | 2019-01-28 | Double-layer rotational flow vane type urea injection mixing unit |
| PCT/CN2019/122337 WO2020155834A1 (en) | 2019-01-28 | 2019-12-02 | Swirl vane-type urea injection mixing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910079681.8A CN109488426B (en) | 2019-01-28 | 2019-01-28 | Double-layer rotational flow vane type urea injection mixing unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109488426A CN109488426A (en) | 2019-03-19 |
| CN109488426B true CN109488426B (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910079681.8A Active CN109488426B (en) | 2019-01-28 | 2019-01-28 | Double-layer rotational flow vane type urea injection mixing unit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109488426B (en) |
| WO (1) | WO2020155834A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488426B (en) * | 2019-01-28 | 2023-10-03 | 凯龙高科技股份有限公司 | Double-layer rotational flow vane type urea injection mixing unit |
| CN110439659B (en) * | 2019-09-12 | 2024-07-02 | 无锡威孚力达催化净化器有限责任公司 | Nozzle integrated SCR post-treatment urea mixing device |
| CN113027573B (en) * | 2021-02-08 | 2024-06-21 | 凯龙高科技股份有限公司 | Wall flow vortex mixer |
| CN113898448B (en) * | 2021-11-05 | 2024-08-09 | 无锡亿利环保科技有限公司 | Urea mixer with forward air intake |
| CN114542248B (en) * | 2022-01-18 | 2023-06-23 | 潍柴动力股份有限公司 | SCR system and engine |
| CN116335799B (en) * | 2023-03-22 | 2024-06-07 | 一汽解放汽车有限公司 | Urea mixing structure and urea mixer |
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| DE102011120685A1 (en) * | 2011-12-09 | 2012-07-05 | Daimler Ag | Exhaust gas system for vehicle, has shielding element formed as cover and arranged on side of mixing pipe turned towards inlet for shielding feed unit against subjection with exhaust gas heat |
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| CN109488426B (en) * | 2019-01-28 | 2023-10-03 | 凯龙高科技股份有限公司 | Double-layer rotational flow vane type urea injection mixing unit |
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2019
- 2019-01-28 CN CN201910079681.8A patent/CN109488426B/en active Active
- 2019-12-02 WO PCT/CN2019/122337 patent/WO2020155834A1/en active Application Filing
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| CN205025535U (en) * | 2013-04-25 | 2016-02-10 | 天纳克（苏州）排放系统有限公司 | Mix subassembly, inlet tube subassembly and exhaust aftertreatment part thereof |
| CN205714373U (en) * | 2016-06-13 | 2016-11-23 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment mixing arrangement |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020155834A1 (en) | 2020-08-06 |
| CN109488426A (en) | 2019-03-19 |
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