CN111271161A - Half slot hole tubular urea mixing arrangement - Google Patents
Half slot hole tubular urea mixing arrangement Download PDFInfo
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- CN111271161A CN111271161A CN202010215868.9A CN202010215868A CN111271161A CN 111271161 A CN111271161 A CN 111271161A CN 202010215868 A CN202010215868 A CN 202010215868A CN 111271161 A CN111271161 A CN 111271161A
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- Prior art keywords
- slotted
- urea
- cylinder assembly
- assembly
- nozzle
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
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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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- 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
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 relates to a semi-slot tubular urea mixing device, which comprises a urea nozzle, a cyclone tube assembly, a Z-shaped partition plate, a cyclone plate, an inner cylinder assembly and an outer cylinder assembly, wherein the inner cylinder assembly is arranged in the middle of the urea nozzle; the urea nozzle is arranged on the outer cylinder assembly, the spiral-flow pipe assembly is inserted into the open hole in the Z-shaped partition plate and welded, then the spiral-flow pipe assembly and the spiral-flow plate are together plugged into the inner cylinder assembly, the outer cylinder assembly is sleeved outside the inner cylinder assembly as a heat insulation part, and the urea nozzle is arranged at the upper end of the outer cylinder assembly. The mixing device can realize the mixing of urea and air flow and improve the distribution uniformity of ammonia gas on the end surface of the SCR carrier.
Description
Technical Field
The invention belongs to the technical field of urea mixing devices, and particularly relates to a semi-slot tubular urea mixing device.
Background
In the application technology of the SCR system, 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 mixer position is the key in the whole development process. 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
The invention aims to provide a semi-slotted tubular urea mixing device which can reduce the risk of urea crystallization and remarkably improve the urea mixing effect and the urea decomposition rate, and is used for solving the problems of urea mixing, urea decomposition and urea crystallization prevention in an SCR system.
The purpose of the invention is realized as follows:
a semi-slot hole tubular urea mixing device comprises a urea nozzle, a cyclone tube assembly, a Z-shaped partition plate, a cyclone plate, an inner cylinder assembly and an outer cylinder assembly;
the urea nozzle is arranged on the outer cylinder assembly, the spiral-flow pipe assembly is inserted into the open hole in the Z-shaped partition plate and welded, then the spiral-flow pipe assembly and the spiral-flow plate are together plugged into the inner cylinder assembly, the outer cylinder assembly is sleeved outside the inner cylinder assembly as a heat insulation part, and the urea nozzle is arranged at the upper end of the outer cylinder assembly.
Furthermore, the spiral-flow pipe assembly comprises a spiral-flow pipe, a metal wire mesh ring, a half slotted hole pipe and a blocking cover, wherein the spiral-flow pipe is welded above the metal wire mesh ring, the slotted hole pipe is welded below the metal wire mesh ring, and the blocking cover is welded at the bottom of the slotted hole pipe.
Furthermore, a plurality of small holes are uniformly distributed on the peripheral wall surface of the half-slotted hole pipe, a half-edge slotted hole is formed in the wall surface, and three strip-shaped slotted holes are uniformly arranged on the lower blocking cover at intervals along the circumferential direction.
Further, outer barrel subassembly comprises barrel, nozzle base, base heat insulating cotton and base heat shield.
The urea nozzle is installed on the nozzle base, and the range upon range of base heat insulating cotton and the base heat insulating cover that is provided with between the two, the nozzle base sets up the barrel surface at outer barrel subassembly.
Furthermore, a slotted hole is formed below the Z-shaped clapboard.
Furthermore, the spiral-flow plate is provided with two layers of slotted holes, namely a first layer slotted hole and a second layer slotted hole, wherein the two layers of slotted holes are in a concentric ring structure, the second layer slotted hole is positioned inside the first layer slotted hole, the first layer slotted hole is a large semicircular arc slotted hole, and the second layer slotted hole is in a rectangular slotted hole structure with arc-shaped transition edges.
The invention has the following advantages:
1. the two rotational flow devices (the rotational flow pipe and the rotational flow plate) in the vertical direction and the horizontal direction are adopted, so that the mixing effect of urea and waste gas is ensured, and the crystallization risk of urea is effectively reduced;
2. the cyclone tube subassembly adopts the hole pipe of having opened half limit slotted hole, can carry out the secondary urea breakage to the urea granule, can guide the urea granule to barrel middle part position simultaneously again and spread, has improved the distribution degree of consistency of ammonia and urea greatly.
3. The semi-slotted pipe can greatly reduce the pressure loss of the mixing device;
4. the arc-shaped plugging cover with the long slotted hole is arranged below the half slotted hole pipe, so that urea particles can be prevented from being accumulated on the plugging cover after colliding with the wall, and the risk of urea crystallization is greatly reduced;
5. the cyclone plate is reused behind the cyclone tube, the effect of secondary mixing of urea particles is achieved, and meanwhile, the efficiency of decomposing urea into ammonia gas and the uniformity of the distribution of the ammonia on the front end face of the SCR catalyst are guaranteed.
Drawings
FIG. 1 is an isometric view of a semi-slot tubular urea mixing device according to the present invention.
FIG. 2 is a cross-sectional view of a semi-slotted tubular urea mixing device according to the present invention.
FIG. 3 is a schematic view of a swirl plate of a semi-slot tubular urea mixing device according to the present invention.
FIG. 4 is a schematic view of a swirl tube assembly of a semi-slot tubular urea mixing apparatus according to the present invention.
FIG. 5 is a schematic view of a Z-shaped baffle of the present invention.
FIG. 6 is a schematic view of an inner barrel assembly of the present invention.
FIG. 7 is a schematic view of the outer barrel assembly of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
A semi-slot tubular urea mixing device is shown in figures 1-7 and comprises a urea nozzle 1, a swirl tube component 2, a Z-shaped partition plate 3, a swirl plate 4, an inner cylinder component 5 and an outer cylinder component 6;
wherein the urea nozzle is installed on outer barrel subassembly 6, and spiral-flow tube subassembly 2 inserts in the opening hole on the Z shape baffle 3 and welds, then fills in inner barrel subassembly 5 with spiral-flow plate 4 together, and outer barrel subassembly 6 overlaps in the inner barrel subassembly 5 outside as heat insulating part, urea nozzle 1 sets up at outer barrel subassembly 6 upper end.
The cyclone tube component 2 comprises four parts, namely a cyclone tube 2-1, a metal wire mesh ring 2-2, a half-slotted hole tube 2-3 and a blocking cover 2-4, wherein the cyclone tube 2-1 is welded above the metal wire mesh ring 2-2, the slotted hole tube 2-3 is welded below the metal wire mesh ring 2-2, and the blocking cover 2-4 is welded at the bottom of the slotted hole tube 2-3.
A plurality of small holes are uniformly distributed on the peripheral wall surface of the half slotted hole pipe 2-3, a half slotted hole 2-5 is arranged on the wall surface, and three strip-shaped slotted holes 2-6 are uniformly arranged on the lower blocking cover 2-4 at intervals along the circumferential direction.
The outer cylinder assembly 6 consists of a cylinder 6-1, a nozzle base 6-2, base heat insulation cotton 6-3 and a base heat insulation cover 6-4.
The urea nozzle 1 is arranged on a nozzle base 6-2, base heat insulation cotton 6-3 and a base heat insulation cover 6-4 are arranged between the nozzle base and the nozzle base in a stacked mode, and the nozzle base 6-2 is arranged on the outer surface of a cylinder body of the outer cylinder body assembly 6.
A slotted hole 3-1 is arranged below the Z-shaped clapboard 3.
The spiral-flow plate 4 is provided with two layers of slotted holes, a first layer of slotted holes 4-1 and a second layer of slotted holes 4-2, the two layers of slotted holes are in a concentric ring structure, the second layer of slotted holes are positioned inside the first layer of slotted holes, the first layer of slotted holes 4-1 are large semicircular arc slotted holes, and the second layer of slotted holes 4-2 are in a rectangular slotted hole structure with arc-shaped transition edges.
When entering the drum type urea mixer device, the airflow firstly forms strong rotating airflow through the cyclone tube 2-1 above the cyclone tube component 2. The urea is now injected through the nozzle 1 into the swirl tube assembly 2 and forms atomized particles. Atomized particles enter the metal wire mesh ring 2-2 under the action of strong rotational flow in the rotational flow pipe 2-1, and urea particles are crushed, quickly evaporated and decomposed in the metal wire mesh ring 2-2 and enter the semi-slotted hole pipe 2-3 under the action of rotational flow gas. Part of urea particles in the half-slotted pipe are diffused through small holes on the half-slotted pipe 2-3 and slotted holes on the lower blocking cover 2-4, and the other part of urea particles flow out through half-side slotted holes on the half-slotted pipe 2-3. The half slotted holes on the half slotted hole pipes 2-3 are arranged above and are as close to the middle position of the cylinder 6-1 as possible so as to guide most urea particles to diffuse from the middle position of the cylinder 6-1, and the diffused urea particles finish secondary rotary mixing through the cyclone plate 4 at the rear part, so that the urea particles and ammonia gas decomposed from the urea particles can be uniformly distributed on the front end surface of the SCR.
On the other hand, because the wall surface of the half-slot pipe 2-3 is distributed with small holes and half-edge slots, and the lower blocking cover 2-4 is also provided with the strip-shaped slot, urea particles can be quickly diffused and are difficult to accumulate in the half-slot pipe 2-3. Meanwhile, the slotted holes are formed below the Z-shaped partition plate 3, and part of air flow can be introduced, so that urea discharged from the slotted holes below the blocking covers 2-4 is swept completely, accumulation of urea below the inner cylinder body 5 is prevented, and the risk of urea crystallization is greatly reduced.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the principles of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (6)
1. A semi-slot tubular urea mixing device is characterized by comprising a urea nozzle (1), a swirl tube assembly (2), a Z-shaped partition plate (3), a swirl plate (4), an inner cylinder assembly (5) and an outer cylinder assembly (6);
the urea nozzle is installed on the outer cylinder assembly (6), the cyclone tube assembly (2) is inserted into a hole in the Z-shaped partition plate (3) and welded, then the cyclone tube assembly and the cyclone plate (4) are plugged into the inner cylinder assembly (5), the outer cylinder assembly (6) is sleeved on the outer side of the inner cylinder assembly (5) as a heat insulation part, and the urea nozzle (1) is arranged at the upper end of the outer cylinder assembly (6).
2. The semi-slotted tubular urea mixing device according to claim 1, characterized in that the cyclone tube assembly (2) comprises four parts, namely a cyclone tube (2-1), a wire mesh ring (2-2), a semi-slotted tube (2-3) and a blanking cap (2-4), wherein the cyclone tube (2-1) is welded above the wire mesh ring (2-2), the slotted tube (2-3) is welded below the wire mesh ring (2-2), and the blanking cap (2-4) is welded at the bottom of the slotted tube (2-3).
3. The half-slotted-pipe urea mixing device according to claim 1, characterized in that the peripheral wall of the half-slotted pipe (2-3) is uniformly distributed with a plurality of small holes, and the wall is provided with a half-slotted groove (2-5), and the lower block cover (2-4) is also provided with three strip-shaped slotted holes (2-6) uniformly spaced along the circumferential direction.
4. The half-slot tubular urea mixing device according to claim 1, characterized in that the outer cylinder assembly (6) is composed of a cylinder (6-1), a nozzle base (6-2), a base heat insulation cotton (6-3) and a base heat insulation cover (6-4);
the urea nozzle (1) is arranged on a nozzle base (6-2), base heat insulation cotton (6-3) and a base heat insulation cover (6-4) are arranged between the urea nozzle and the nozzle base in a stacked mode, and the nozzle base (6-2) is arranged on the outer surface of a cylinder body of the outer cylinder body component (6).
5. A semi-slotted urea mixing device according to claim 1, characterized in that the slotted holes (3-1) are made under the Z-shaped partition (3).
6. The mixing device of claim 1, wherein the swirl plate (4) is provided with two layers of slotted holes, a first layer of slotted holes (4-1) and a second layer of slotted holes (4-2), the two layers of slotted holes are in a concentric ring structure, the second layer of slotted holes is positioned inside the first layer of slotted holes, the first layer of slotted holes (4-1) are in a large semicircular arc slotted holes, and the second layer of slotted holes (4-2) are in a rectangular slotted hole structure with an arc transition edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010215868.9A CN111271161A (en) | 2020-03-25 | 2020-03-25 | Half slot hole tubular urea mixing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010215868.9A CN111271161A (en) | 2020-03-25 | 2020-03-25 | Half slot hole tubular urea mixing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111271161A true CN111271161A (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010215868.9A Pending CN111271161A (en) | 2020-03-25 | 2020-03-25 | Half slot hole tubular urea mixing arrangement |
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| Country | Link |
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| CN (1) | CN111271161A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356974A (en) * | 2021-05-31 | 2021-09-07 | 东风商用车有限公司 | Efficient anti-crystallization SCR mixer and automobile comprising same |
| CN114483264A (en) * | 2022-01-28 | 2022-05-13 | 无锡威孚力达催化净化器有限责任公司 | High-efficient anti-crystallization mixer device |
| CN115217590A (en) * | 2022-07-27 | 2022-10-21 | 无锡威孚力达催化净化器有限责任公司 | Urea mixing arrangement that two-way whirl is strengthened |
-
2020
- 2020-03-25 CN CN202010215868.9A patent/CN111271161A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356974A (en) * | 2021-05-31 | 2021-09-07 | 东风商用车有限公司 | Efficient anti-crystallization SCR mixer and automobile comprising same |
| CN114483264A (en) * | 2022-01-28 | 2022-05-13 | 无锡威孚力达催化净化器有限责任公司 | High-efficient anti-crystallization mixer device |
| CN115217590A (en) * | 2022-07-27 | 2022-10-21 | 无锡威孚力达催化净化器有限责任公司 | Urea mixing arrangement that two-way whirl is strengthened |
| CN115217590B (en) * | 2022-07-27 | 2024-02-02 | 无锡威孚力达催化净化器有限责任公司 | Urea mixing arrangement that two-way whirl was strengthened |
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Effective date of registration: 20211018 Address after: No.559 Xinhui Road, Huishan Economic Development Zone, Wuxi City, Jiangsu Province Applicant after: WUXI WEIFU LIDA CATALYTIC CONVERTER Co.,Ltd. Applicant after: Dongfeng Commercial Vehicle Co.,Ltd. Address before: No.559 Xinhui Road, Huishan Economic Development Zone, Wuxi City, Jiangsu Province Applicant before: WUXI WEIFU LIDA CATALYTIC CONVERTER Co.,Ltd. |