CN210564724U - Bidirectional rotational flow cylinder type urea mixing device - Google Patents
Bidirectional rotational flow cylinder type urea mixing device Download PDFInfo
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- CN210564724U CN210564724U CN201921188643.8U CN201921188643U CN210564724U CN 210564724 U CN210564724 U CN 210564724U CN 201921188643 U CN201921188643 U CN 201921188643U CN 210564724 U CN210564724 U CN 210564724U
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Abstract
The utility model relates to a bidirectional rotational flow cylinder type urea mixing device, which comprises a nozzle base, a base supporting cover, a rotational flow pipe, a metal wire mesh ring, a supporting plate, a rear rotational flow plate, a front rotational flow plate and a cylinder body; a support plate is arranged in the barrel, an opening is formed in the front part of the support plate, a front rotational flow plate is arranged in the opening, a rear rotational flow plate is arranged at the rear part of the support plate, and the front rotational flow plate, the support plate and the rear rotational flow plate form a mixing cavity in the barrel; the nozzle base, the base supporting cover, the cyclone tube and the wire mesh ring are sequentially and fixedly connected from top to bottom, the base supporting cover penetrates through the opening in the barrel to be fixedly connected with the barrel, and the cyclone tube penetrates through the opening in the middle of the supporting plate to be fixedly connected with the supporting plate; the metal wire mesh ring extends into the mixing cavity; the nozzle base, the base supporting cover, the cyclone tube and the metal wire mesh ring are obliquely arranged. The utility model discloses can be under the circumstances of guaranteeing the urea mixing degree of consistency, urea decomposition efficiency is not high and crystallization problem in solving the SCR system.
Description
Technical Field
The utility model relates to a two-way whirl cylinder urea mixing arrangement belongs to diesel engine tail gas aftertreatment field.
Background
In the application technology of the SCR system, the mixing uniformity of urea and exhaust gas, the risk of urea crystallization and the urea decomposition rate are key indexes for evaluating a urea mixing device. The urea mixing device needs to fully consider the balance of the three indexes to play a greater role.
Conventional urea mixers typically use a fin structure to disturb the parallel flow to achieve mixing and decomposition of the urea and exhaust gases. In recent years, in order to reduce the risk of urea crystallization on the mixer wall surface, a swirling flow structure has been gradually used to form a swirling air flow to achieve higher mixing uniformity. However, in application, the urea spraying direction and the rotational flow flowing direction are not consistent, so that the rotational flow structure often causes serious urea crystallization and lower urea decomposition efficiency.
Disclosure of Invention
An object of the utility model is to overcome the not enough of existence among the prior art, provide a two-way whirl cylinder urea mixing arrangement, the device can be under the condition of guaranteeing the urea mixing degree of consistency, and urea decomposition efficiency is not high and crystallization problem among the solution SCR system.
According to the utility model provides a technical scheme: a bidirectional rotational flow cylinder type urea mixing device comprises a nozzle base, a base supporting cover, a rotational flow pipe, a metal wire mesh ring, a supporting plate, a rear rotational flow plate, a front rotational flow plate and a cylinder body;
a support plate is arranged in the barrel, an opening is formed in the front part of the support plate, a front rotational flow plate is arranged in the opening, a rear rotational flow plate is arranged at the rear part of the support plate, and the front rotational flow plate, the support plate and the rear rotational flow plate form a mixing cavity in the barrel;
the nozzle base, the base supporting cover, the cyclone tube and the wire mesh ring are sequentially and fixedly connected from top to bottom, the base supporting cover penetrates through the opening in the barrel to be fixedly connected with the barrel, and the cyclone tube penetrates through the opening in the middle of the supporting plate to be fixedly connected with the supporting plate; the metal wire mesh ring extends into the mixing cavity;
the nozzle base, the base supporting cover, the cyclone tube and the metal wire mesh ring are obliquely arranged.
Further, the heat preservation cotton cover is established to the barrel outside cover, the heat shield is established to the outside cover of heat preservation cotton cover, it is fixed through the heat insulating shroud that sets up at both ends to separate the heat shield.
Further, a connecting flange is arranged at the front end of the cylinder body.
Furthermore, the middle part of the supporting plate and the wall of the cylinder body form an inclined angle.
Furthermore, the wall of the cyclone tube is axially provided with cyclone blades.
Furthermore, the center of the front rotary flow plate is provided with an air injection hole, and a circle of ear-shaped vanes are uniformly distributed around the air injection hole.
Furthermore, a circle of cat ear blades are uniformly distributed on the outer circumference of the rear rotational flow plate, and a circle of small blades are uniformly distributed on the inner circumference of the rear rotational flow plate.
Further, the gas injection holes and the centers of the small blades are on the same axis.
Further, the support plate is a Z-shaped support plate.
Compared with the prior art, the utility model, have following advantage:
1. the two rotational flow devices 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 urea injection position adopts a small-diameter cyclone tube structure, so that the air flow speed is improved, the cyclone effect is enhanced, and meanwhile, the cyclone tube is arranged in a forward-inclined manner, so that the sprayed urea particles can obtain the initial speed in the axial direction, and the urea particles are more quickly carried away from the cyclone tube and are crystallized on the tube wall;
3. the spiral-flow pipe is obliquely arranged in front, so that the sprayed urea particles can obtain the initial speed in the axial direction, the vertical downward speed of the urea particles can be reduced, the front spiral-flow plate arranged on the Z-shaped plate can generate strong spiral flow in the horizontal direction, and the risk that the urea falls into the bottom of the cylinder and is accumulated and crystallized at the bottom of the cylinder is reduced;
4. the whole Z-shaped plate and the swirl tube form included angles with the installation direction, so that the influence of the self gravity of urea particles on the wall contact position of the urea particles is reduced, and the crystallization risk at the bottom of the swirl tube is greatly reduced;
5. the urea can be fully crushed by using the wire mesh and changed into smaller urea particles, so that the urea is more easily influenced by the rotational flow in the horizontal direction and is quickly carried away from the mixing cavity to enter the front end face of the SCR catalyst;
6. 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 assembly schematic diagram of the urea mixing device of the present invention.
Fig. 2 is a left side view of the urea mixing device of the present invention.
Fig. 3 is a right side view of the urea mixing device of the present invention.
Fig. 4 is a cross-sectional view of the urea mixing device of the present invention.
Fig. 5 is a schematic diagram of the inner components of the urea mixing device of the present invention.
Fig. 6 is a schematic exploded view of the urea mixing device of the present invention.
Fig. 7 is a schematic diagram of the application of the urea mixing device in the SCR exhaust aftertreatment device according to the present invention.
Description of reference numerals: 1-nozzle base, 2-base supporting cover, 3-cyclone tube, 3.1-cyclone blade, 4-metal wire mesh ring, 5-supporting plate, 6-rear cyclone plate, 6.1-small blade, 7-front cyclone plate, 7.1-air jet hole, 8-cylinder, 9-heat preservation cotton sleeve, 10-heat insulation cover, 11-connecting flange, 12-heat insulation cover cap, 1 '-air inlet tube component, 2' -DOC component, 3 '-DPF component, 4' -bidirectional cyclone cylinder type urea mixing device, 5 '-SCR component and 6' -air outlet tube component.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
The application of the two-way rotational flow cylinder type urea mixing device on the exhaust after-treatment device is shown in figure 7. Exhaust aftertreatment device is by intake pipe subassembly 1 ', DOC subassembly 2', DPF subassembly 3 ', two-way whirl cylinder urea mixing arrangement 4' (promptly a two-way whirl cylinder urea mixing arrangement), SCR subassembly 5 'and outlet duct subassembly 6' are constituteed. The exhaust gas discharged by the engine enters the exhaust gas post-treatment device from the air inlet pipe component 1 ', passes through the DOC component 2 ' and the DPF component 3 ' and then enters the bidirectional rotational flow cylinder type urea mixing device 4 ', and the urea is mixed, secondarily crushed and decomposed in the bidirectional rotational flow cylinder type urea mixing device 4 '. The urea decomposes into ammonia gas and then enters the SCR assembly 5' and is finally discharged through the outlet duct assembly.
As shown in fig. 6, a bidirectional cyclone cartridge type urea mixing device comprises a nozzle base 1, a base support cover 2, a cyclone tube 3, a wire mesh ring 4, a support plate 5, a rear cyclone plate 6, a front cyclone plate 7 and a cylinder 8; the urea nozzle is mounted on the nozzle base 1.
A support plate 5 is arranged in the cylinder 8, and the support plate 5 is a Z-shaped support plate; the front part of the supporting plate 5 is provided with an opening, a front rotational flow plate 7 is arranged in the opening, a rear rotational flow plate 6 is arranged at the rear part of the supporting plate 5, and the front rotational flow plate 7, the supporting plate 5 and the rear rotational flow plate 6 form a mixing cavity in a cylinder 8;
the nozzle base 1, the base support cover 2, the cyclone tube 3 and the metal wire mesh ring 4 are fixedly connected in sequence from top to bottom, the base support cover 2 penetrates through an opening in the cylinder 8 and is fixedly connected with the cylinder 8, and the cyclone tube 3 penetrates through an opening in the middle of the support plate 5 and is fixedly connected with the support plate 5; the metal wire mesh ring 4 extends into the mixing cavity;
the nozzle base 1, the base supporting cover 2, the cyclone tube 3 and the metal wire mesh ring 4 are obliquely arranged; the spiral-flow pipe 3 is obliquely arranged in front, so that the sprayed urea particles can obtain the initial speed in the axial direction, the urea particles are more quickly taken away from the spiral-flow pipe 3, and the risk of crystallization of urea on the pipe wall is reduced;
the cylinder 8 is externally sleeved with a heat insulation cotton sleeve 9, the heat insulation cotton sleeve 9 is externally sleeved with a heat insulation cover 10, the heat insulation cover 10 is fixed through heat insulation cover covers 12 arranged at two ends, and the heat insulation cotton sleeve 9 is used for enabling the bidirectional rotational flow cylinder type urea mixing device to maintain a high temperature so as to accelerate the urea decomposition into ammonia.
The front end of the cylinder body 8 is provided with a connecting flange 11, and the connecting flange 11 is mainly used for connecting a urea mixing device.
The middle part of the supporting plate 5 and the wall of the cylinder 8 form an inclined angle; the included angles between the whole supporting plate 5 and the cyclone tube 3 and the installation direction reduce the influence of the self gravity of urea particles on the wall contact position of the urea particles, so that the crystallization risk at the bottom of the cyclone tube 3 is greatly reduced;
and the wall of the cyclone tube 3 is axially provided with cyclone blades 3.1. As shown in fig. 3, the front swirler 7 is provided with an air injection hole 7.1 at the center, and a circle of ear-shaped vanes are uniformly distributed around the air injection hole 7.1. As shown in fig. 2, a circle of cat ear blades is uniformly distributed on the outer circumference of the rear rotational flow plate 6, and a circle of small blades 6.1 is uniformly distributed on the inner circumference of the rear rotational flow plate 6. The swirl vanes 3.1, the catenaria vanes and the bladeletts 6.1 are all used to induce the airflow to rotate.
The centers of the air injection hole 7.1 and the small blade 6.1 are on the same axis, and the small blade 6.1 can rotate the air flow which is blown from the air injection hole 7.1 in a straight line.
The working process is as follows: as shown in fig. 4 and 7, when the engine exhaust enters the bi-directional swirl cartridge urea mixing device 4 ' through the DOC assembly 2 ', the DPF assembly 3 ', the gas flow is split into two parts. One part of the airflow enters the cyclone tube 3 and forms strong vertical rotating airflow, and the other part of the airflow forms strong horizontal rotating airflow through the front cyclone plate 7. Urea is sprayed into the cyclone tube 3 from the urea nozzle base 1, distributed in a conical shape and quickly diffused under the influence of vertical strong rotating airflow. Meanwhile, the urea is coated on the metal wire mesh ring 4 due to the high urea spraying speed. The rolled fine wire mesh has good secondary crushing effect on the sprayed urea particles, and further refines the particle size of the urea, thereby greatly accelerating the decomposition of the urea.
The average particle size of urea particles coming out of the metal wire mesh ring 4 is greatly reduced, and the urea particles are easily influenced by strong rotational flow in the horizontal direction, are taken away by the horizontal strong rotational flow entering the front rotational flow plate 7 and enter the rear rotational flow plate 6, so that the urea particles are prevented from accumulating after being adhered to the wall at the bottom of the cylinder 8. The rear cyclone plate 6 and the front cyclone plate 7 have the same rotating direction, so that the intensity of horizontal rotating airflow is enhanced, and the uniformity of the front end surface distribution of NH3 decomposed by urea in the SCR assembly 5' is ensured.
The utility model discloses a broken and the mixture of urea are realized to two-way strong whirl, reduce the crystallization risk simultaneously, have improved urea decomposition rate.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A bidirectional rotational flow cylinder type urea mixing device is characterized by comprising a nozzle base (1), a base supporting cover (2), a rotational flow pipe (3), a metal wire mesh ring (4), a supporting plate (5), a rear rotational flow plate (6), a front rotational flow plate (7) and a cylinder body (8);
a support plate (5) is arranged in the barrel (8), an opening is formed in the front of the support plate (5), a front vortex plate (7) is installed in the opening, a rear vortex plate (6) is installed at the rear of the support plate (5), and the front vortex plate (7), the support plate (5) and the rear vortex plate (6) form a mixing cavity in the barrel (8);
the nozzle base (1), the base supporting cover (2), the cyclone tube (3) and the metal wire mesh ring (4) are sequentially and fixedly connected from top to bottom, the base supporting cover (2) penetrates through an opening in the barrel body (8) and is fixedly connected with the barrel body (8), and the cyclone tube (3) penetrates through an opening in the middle of the supporting plate (5) and is fixedly connected with the supporting plate (5); the metal wire mesh ring (4) extends into the mixing cavity;
the nozzle base (1), the base supporting cover (2), the cyclone tube (3) and the metal wire mesh ring (4) are obliquely arranged.
2. The bidirectional cyclone cartridge type urea mixing device as claimed in claim 1, wherein a heat insulation cotton sleeve (9) is sleeved outside the cartridge body (8), a heat insulation cover (10) is sleeved outside the heat insulation cotton sleeve (9), and the heat insulation cover (10) is fixed by heat insulation cover caps (12) arranged at two ends.
3. A bi-directional cyclone cartridge type urea mixing device as claimed in claim 1, characterized in that the front end of the cartridge (8) is provided with a connecting flange (11).
4. A bi-directional cyclone cartridge urea mixing device according to claim 1, characterized in that the middle of the support plate (5) forms an oblique angle with the wall of the cartridge (8).
5. A bi-directional swirl cartridge urea mixing device according to claim 1, wherein the wall of the swirl tube (3) is provided with swirl vanes (3.1) in axial direction.
6. A bi-directional swirl cartridge urea mixing device according to claim 1, wherein the front swirl plate (7) is provided with air injection holes (7.1) in the center, and a circle of cat-ear blades are uniformly distributed around the air injection holes (7.1).
7. A bi-directional cyclone cartridge type urea mixer according to claim 6, characterized in that the rear cyclone plate (6) has a circle of cat ear blades distributed on its outer circumference and a circle of small blades (6.1) distributed on its inner circumference.
8. A bi-directional swirl cartridge urea mixing device according to claim 7, characterized in that the gas injection holes (7.1) and the center of the small blades (6.1) are on the same axis.
9. A bi-directional swirl cartridge urea mixing device according to claim 1 or 4, characterized in that the support plate (5) is a Z-shaped support plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921188643.8U CN210564724U (en) | 2019-07-25 | 2019-07-25 | Bidirectional rotational flow cylinder type urea mixing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921188643.8U CN210564724U (en) | 2019-07-25 | 2019-07-25 | Bidirectional rotational flow cylinder type urea mixing device |
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| CN210564724U true CN210564724U (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2019
- 2019-07-25 CN CN201921188643.8U patent/CN210564724U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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