CN212154908U - Shunting rotating urea mixing device - Google Patents
Shunting rotating urea mixing device Download PDFInfo
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- CN212154908U CN212154908U CN202020430136.7U CN202020430136U CN212154908U CN 212154908 U CN212154908 U CN 212154908U CN 202020430136 U CN202020430136 U CN 202020430136U CN 212154908 U CN212154908 U CN 212154908U
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Abstract
The utility model relates to a rotatory urea mixing arrangement of reposition of redundant personnel, the novel nipple rectifier comprises a cylindrical shel, one side is the air inlet, the opposite side is the gas outlet, open in the barrel periphery has the urea mounting hole, install the nozzle base in the urea mounting hole, install the urea nozzle in the nozzle base, air inlet port installation baffle, the baffle middle part is the diaphragm, it has cyclone tube mounting hole to open in the diaphragm, diaphragm one side upper portion is the overhead gage, diaphragm opposite side lower part is the lower baffle, cyclone tube mounting hole below sets up the guide plate, install the cyclone tube in the cyclone tube mounting hole, cyclone tube upper portion periphery equipartition whirl mouth, whirl mouth one side sets up the whirl board, the interior periphery of cyclone tube lower part installs the wire net circle, gas outlet port installation reposition of. The utility model discloses, simple structure introduces a plurality of regions with urea through the reposition of redundant personnel effect and diffuses, reduces urea cumulant to show the mixing arrangement who improves the mixed effect of urea and urea decomposition rate, be used for solving the mixing of urea in the SCR system, decompose and prevent crystallization problem.
Description
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment, and relates to a split-flow rotary 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 after-treatment device is used as a key component of the after-treatment system of the commercial vehicle in the six-emission stage of China, and a urea mixing device of the 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, a cyclone structure is adopted to realize the problem of urea crushing and crystallization, but a urea nozzle is generally arranged above an after-treatment device, and in practical application, the direction of a rotating airflow formed by the cyclone structure is vertical to the airflow direction in an SCR catalyst, so that urea is entrained by the rotating airflow and the accumulation amount below an after-treatment cylinder is large, and serious urea crystallization is easy to generate. Meanwhile, the rotating airflow and the catalyst inlet are in a vertical state, and 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 shunting rotating urea mixing device, which is used for introducing urea into a plurality of areas for diffusion through shunting action and reducing urea accumulation so as to remarkably improve urea mixing effect and urea decomposition rate, and is used for solving the problems of urea mixing, decomposition and crystallization prevention in an SCR system.
According to the technical scheme provided by the invention: the utility model provides a rotatory urea mixing arrangement of reposition of redundant personnel, includes the barrel, one side is the air inlet, and the opposite side is the gas outlet, and open the barrel periphery has the urea mounting hole, install the nozzle base in the urea mounting hole, install the urea nozzle in the nozzle base, air inlet port installation baffle, the baffle middle part is the diaphragm, it has the cyclone tube mounting hole to open in the diaphragm, diaphragm one side upper portion is last baffle, diaphragm opposite side lower part is baffle down, cyclone tube mounting hole below sets up the guide plate, install the cyclone tube in the cyclone tube mounting hole, cyclone tube upper portion periphery equipartition whirl mouth, whirl mouth one side sets up the cyclone plate, the interior circumference of cyclone tube lower part installation silk screen ring, gas outlet port installation reposition of redundant personnel rotating assembly.
As a further improvement of the invention, the flow dividing rotating assembly comprises support short pipes, and the periphery of the support short pipes is staggered with flow dividing blades.
As a further improvement of the invention, the wire mesh ring is made of metal material.
As a further improvement of the invention, the outside of the cylinder body is wrapped with heat preservation cotton, and the outside of the heat preservation cotton is provided with a heat insulation cover.
As a further improvement of the invention, the nozzle base is fixedly installed in the urea installation hole through a welding process.
As a further improvement of the urea spraying device, a urea spraying nozzle through hole is formed in the middle of the spraying nozzle base, screw holes are uniformly distributed on the periphery of the urea spraying nozzle through hole, and the urea spraying nozzle is mounted on the spraying nozzle base through bolts.
As a further improvement of the invention, a nozzle protection cover is arranged on the periphery of the urea nozzle.
As a further improvement of the invention, the partition is Z-shaped.
As a further improvement of the invention, the upper baffle and the lower baffle are attached to the inner wall of the cylinder.
As a further improvement of the invention, two ends of the guide plate are upwarped and uniformly distributed with a plurality of small holes.
Compared with the prior art, the invention has the following advantages:
1. the invention has simple structure and small occupied space; adopt two whirl devices of vertical direction and horizontal direction, vertical direction adopts the cyclone tube subassembly, has guaranteed urea can be after spouting abundant and waste gas mixing. The horizontal direction adopts the reposition of redundant personnel rotatory mixing assembly, has guaranteed the NH3 mixing uniformity of catalyst terminal surface.
2. The lower end of the cyclone tube component adopts a wire mesh structure, so that heat can be collected to the maximum extent, urea particles can be crushed secondarily, and the decomposition rate of urea can be increased.
3. The cyclone tube assembly is fixed on the periphery through the Z-shaped partition plate assembly, and can play a good supporting role.
4. A guide plate is arranged below the Z-shaped partition plate assembly, so that the urea is prevented from being blown to the bottom of the cylinder body by rotating airflow in the vertical direction and is prevented from being accumulated in a large amount at the bottom; the other effect of guide plate is with the quick water conservancy diversion of most urea to the intermediate position of reposition of redundant personnel rotary mixing subassembly, and the urea of being convenient for is diffused from the intermediate position, improves the diffusion degree of consistency. The remaining urea can also be quickly split to the left and right of the baffle, thereby reducing urea accumulation at the same location.
5. According to the invention, a shunting rotational flow mixing assembly is used again after the rotational flow pipe assembly, and the assembly consists of 5 shunting blades, so that airflow and urea can be guided to 5 shunting positions for rotary diffusion, and the accumulation amount of the urea at the same position is reduced.
6. The flow-dividing rotary mixing component can guide airflow to form strong rotary airflow in the horizontal direction, and ensures the efficiency of decomposing urea into ammonia gas and the uniformity of the distribution of ammonia on the front end face of the SCR catalyst.
7. The middle of the flow-dividing rotary mixing component is supported by the short pipe, so that the air flow and urea can be guided to pass through the middle position. 5 rotating blades with the same shape are uniformly distributed around the short pipe and are arranged in a staggered manner, so that the through-flow section is increased to the maximum extent, and the pressure loss caused by rotational flow is reduced.
8. The shunting rotating mixing component has the advantages of simple structure, convenient and easy processing technology and lower cost.
Drawings
FIG. 1 is an isometric view of a split-flow rotary urea mixing device according to the present invention;
FIG. 2 is a cross-sectional view of a split-flow rotary urea mixing device according to the present invention;
FIG. 3 is an exploded schematic view of a split-flow rotary urea mixing device according to the present invention;
FIG. 4 is an exploded view of the swirl tube assembly of the split-flow rotary urea mixing device of the present invention;
FIG. 5 is an exploded view of a Z-shaped partition plate of the split-flow rotary urea mixing device according to the present invention;
FIG. 6 is a schematic view of the split-flow rotary assembly of the split-flow rotary urea mixing device according to the present invention;
FIG. 7 is a side view of FIG. 6;
FIG. 8 is an exploded view of the split rotating assembly of the split rotating urea mixing device of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the figures 1-8, the device comprises a cylinder body 1, an air inlet 1-1, an air outlet 1-2, urea mounting holes 1-3, heat preservation cotton 2, a heat insulation cover 3, a nozzle connecting bolt assembly 4, a nozzle protection cover 5, a urea nozzle 6, a nozzle base 7, a swirl tube 8, a swirl port 8-1, a wire mesh ring 8-2, a partition plate 9, a transverse plate 9-1, swirl tube mounting holes 9-2, an upper baffle plate 9-3, a lower baffle plate 9-4, a guide plate 9-5, a flow dividing rotary assembly 10 and the like.
As shown in fig. 1-3, the invention relates to a split-flow rotary urea mixing device, which mainly comprises a cylinder 1, heat-preservation cotton 2, a heat-insulation cover 3, a nozzle connecting bolt component 4, a nozzle protective cover 5, a urea nozzle 6, a nozzle base 7, a cyclone tube 8, a partition plate 9, a split-flow rotary component 10 and other parts.
The cylinder body 1 is in a transverse state, one side of the cylinder body is an air inlet 1-1, the other side of the cylinder body is an air outlet 1-2, and the upper part of the periphery of the cylinder body 1 is provided with a urea mounting hole 1-3.
The urea installing holes 1-3 are fixedly provided with a nozzle base 7 through a welding process, the middle of the nozzle base 7 is provided with a urea nozzle through hole, screw holes are uniformly distributed on the periphery of the urea nozzle through hole, a urea nozzle 6 and a nozzle protection cover 5 are arranged on the nozzle base 7 through bolts, and the nozzle protection cover 5 is wrapped on the periphery of the urea nozzle 6 and is mainly used for protecting the urea nozzle 6 from heat damage and impact of other parts.
A partition plate 9 is arranged at the port of an air inlet 1-1, as shown in figure 5, the partition plate 9 is Z-shaped, the middle part of the partition plate 9 is a transverse plate 9-1, a cyclone tube mounting hole 9-2 is formed in the transverse plate 9-1, the upper part of one side of the transverse plate 9-1 is an upper baffle plate 9-3, the lower part of the other side of the transverse plate 9-1 is a lower baffle plate 9-4, and the upper baffle plate 9-3 and the lower baffle plate 9-4 are both arc-shaped and are attached to the inner wall of the barrel body 1. The lower baffle 9-4 is positioned at the outer end of the cylinder body 1. A guide plate 9-5 is arranged below the cyclone tube mounting hole 9-2.
The swirl tube 8 is arranged in the swirl tube mounting hole 9-2, the middle part of the swirl tube 8 is positioned in the swirl tube mounting hole 9-2, as shown in fig. 4, swirl ports 8-1 are uniformly distributed on the periphery of the upper part of the swirl tube 8, a swirl plate is arranged on one side of the swirl ports 8-1, and a wire mesh ring 8-2 is arranged on the inner periphery of the lower part of the swirl tube 8. The swirl tube 8 is located below the urea nozzle 6.
The port 1-2 of the air outlet is provided with a flow dividing rotating assembly 10. As shown in fig. 6-8, the splitter rotary assembly 10 is mainly composed of support spools 10-1 and 5 splitter blades 10-2 of the same construction. The splitter blades 10-2 are arranged in a staggered mode and welded around the support short pipe 10-1. The two splitter blades 10-2 form a through-flow area between them, so that the airflow is split into 5 through-flow areas to form a strong counter-clockwise rotating airflow.
The wire mesh ring 8-2 is made of metal materials, and the service life is longer.
The outside parcel of barrel 1 keeps warm cotton 2, then fixes the cotton 2 that keeps warm through heat exchanger 3 for reduce urea mixing arrangement's calorific loss.
The working process of the invention is as follows:
as shown in FIG. 2, when the air flow enters the urea mixer device from the air inlet 1-1 end of the cylinder 1, the air flow passes through the swirl port 8-1 at the upper part of the swirl pipe 8 to form a strong swirling air flow due to the blocking of the lower baffle 9-4. The urea is now sprayed through the urea nozzle 6 into the cyclone tube 8 and forms atomized particles. Atomized particles enter the screen ring 8-2 under the action of strong rotational flow in the rotational flow pipe 8-1, urea particles are crushed in the screen ring 8-2 and quickly evaporated and decomposed, and the urea particles enter the impact guide plate 9-5 under the action of rotational flow gas to change the direction and shunt. Most of the gas stream and the NH3 generated by the decomposition of urea and urea enter the splitter rotor assembly 10 from a central location, guided by the deflector 9-5. The rest urea enters the subsequent mixing cavity from the two sides of the guide plate 9-5, thereby playing the role of multi-path urea diversion, preventing urea from accumulating at the bottom of the cylinder 1 and the bottom of the guide plate 9-5, and reducing the accumulation amount of urea at the same position. The two sides of the guide plate 9-5 are tilted to guide the air flow and the urea to flow upwards from the two sides, and a plurality of small holes are uniformly distributed on the two sides of the guide plate 9-5 to divide the urea and prevent the urea from accumulating at the position.
Most of NH3 decomposed by urea and entering the flow dividing rotary assembly 10 is staggered by the flow dividing blades 10-2 to form through-flow areas to complete flow dividing, so that the air flow is divided into 5 through-flow areas to form strong anticlockwise rotating rotary air flow, the distribution uniformity of urea and NH3 is greatly improved, and the risk of crystallization caused by accumulation of undecomposed urea at the same position is greatly reduced. In addition, a small part of urea and NH3 is discharged from the middle position through the supporting short pipe 10-1, so that the urea is prevented from being distributed at the edge position of the outlet of the cylinder 1 due to the influence of the centrifugal force of the rotating airflow.
Claims (10)
1. The utility model provides a rotatory urea mixing arrangement of reposition of redundant personnel which characterized in that: the device comprises a barrel body (1), wherein one side of the barrel body (1) is an air inlet (1-1), the other side of the barrel body is an air outlet (1-2), a urea mounting hole (1-3) is formed in the periphery of the barrel body (1), a nozzle base (7) is installed in the urea mounting hole (1-3), a urea nozzle (6) is installed in the nozzle base (7), a partition plate (9) is installed at the port of the air inlet (1-1), a transverse plate (9-1) is arranged in the middle of the partition plate (9), a cyclone tube mounting hole (9-2) is formed in the transverse plate (9-1), an upper baffle plate (9-3) is arranged on the upper portion of one side of the transverse plate (9-1), a lower baffle plate (9-4) is arranged on the lower portion of the other side of the transverse plate (9-1), and a guide plate (9-, spiral-flow tube (8) is installed in spiral-flow tube mounting hole (9-2), spiral-flow tube (8) upper portion periphery equipartition whirl mouth (8-1), whirl mouth (8-1) one side sets up the whirl board, circle installation silk screen ring (8-2) in spiral-flow tube (8) lower part, gas outlet (1-2) port installation reposition of redundant personnel rotating assembly (10).
2. The split-flow rotary urea mixing device of claim 1, wherein: the flow dividing rotating assembly (10) comprises support short pipes (10-1), and flow dividing blades (10-2) are arranged on the peripheries of the support short pipes (10-1) in a staggered mode.
3. The split-flow rotary urea mixing device of claim 1, wherein: the wire mesh ring (8-2) is made of metal materials.
4. The split-flow rotary urea mixing device of claim 1, wherein: the heat-insulation cotton (2) is wrapped outside the barrel (1), and the heat-insulation cover (3) is arranged outside the heat-insulation cotton (2).
5. The split-flow rotary urea mixing device of claim 1, wherein: the nozzle base (7) is fixedly installed in the urea installation holes (1-3) through a welding process.
6. The split-flow rotary urea mixing device of claim 1, wherein: the urea nozzle is characterized in that a urea nozzle through hole is formed in the middle of the nozzle base (7), screw holes are uniformly distributed on the periphery of the urea nozzle through hole, and the urea nozzle (6) is installed on the nozzle base (7) through bolts.
7. The split-flow rotary urea mixing device of claim 1, wherein: and a nozzle protective cover (5) is arranged on the periphery of the urea nozzle (6).
8. The split-flow rotary urea mixing device of claim 1, wherein: the partition plate (9) is Z-shaped.
9. The split-flow rotary urea mixing device of claim 1, wherein: the upper baffle (9-3) and the lower baffle (9-4) are attached to the inner wall of the cylinder body (1).
10. The split-flow rotary urea mixing device of claim 1, wherein: the two ends of the guide plate (9-5) are upwarped and uniformly distributed with a plurality of small holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020430136.7U CN212154908U (en) | 2020-03-28 | 2020-03-28 | Shunting rotating urea mixing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020430136.7U CN212154908U (en) | 2020-03-28 | 2020-03-28 | Shunting rotating urea mixing device |
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| CN212154908U true CN212154908U (en) | 2020-12-15 |
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| CN202020430136.7U Active CN212154908U (en) | 2020-03-28 | 2020-03-28 | Shunting rotating urea mixing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412618A (en) * | 2022-01-27 | 2022-04-29 | 无锡威孚力达催化净化器有限责任公司 | Near-wall blowing type urea mixing device without crushing structure |
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2020
- 2020-03-28 CN CN202020430136.7U patent/CN212154908U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412618A (en) * | 2022-01-27 | 2022-04-29 | 无锡威孚力达催化净化器有限责任公司 | Near-wall blowing type urea mixing device without crushing structure |
| CN114412618B (en) * | 2022-01-27 | 2024-01-02 | 无锡威孚力达催化净化器有限责任公司 | Near-wall blowing urea mixing device without crushing structure |
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