CN210686095U - Guoliu mixed structure before six SCR - Google Patents
Guoliu mixed structure before six SCR Download PDFInfo
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- CN210686095U CN210686095U CN201921294257.7U CN201921294257U CN210686095U CN 210686095 U CN210686095 U CN 210686095U CN 201921294257 U CN201921294257 U CN 201921294257U CN 210686095 U CN210686095 U CN 210686095U
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Abstract
The utility model provides a national six SCR front end urea mixing structure, which comprises a bell mouth cylinder, a heat preservation inner layer cylinder, a gas rotational flow vane tube, a stainless steel winding net, a front baffle, a spoiler, a spherical blanking cover, a nozzle seat supporting base and a nozzle seat; a stainless steel winding net is welded at the bottom of the rotational flow blade pipe, and a spherical plug cover is installed at one end of the heat-preservation inner-layer cylinder; the heat-preservation inner-layer cylinder is arranged in the horn mouth cylinder; a front clapboard is arranged between the heat-preservation inner-layer cylinder and the bell mouth cylinder; a spoiler is arranged on the inner wall of the horn mouth cylinder positioned on one side of the spherical plug cover; the nozzle seat supporting base is welded on the horn mouth cylinder body at the top of the cyclone blade tube, and the nozzle seat is welded on the nozzle seat supporting base. The utility model discloses utilize air current whirl blade pipe to promote tail gas air velocity and air current distribution state, make atomizing urea and tail gas intensive mixing, improve gas flow field and ammonia concentration homogeneity before the catalyst to reduce tail gas pollutant content.
Description
Technical Field
The utility model belongs to the technical field of automobile-used engine exhaust emission purification technique and energy saving and consumption reduction, especially relate to a six SCR front end urea mixed structure in state.
Background
According to the requirements of limit values of pollutant emission and measurement methods (sixth stage of China) of heavy-duty diesel vehicles issued by the ministry of environmental protection and the State quality administration, the heavy-duty diesel vehicles are planned to implement the national six emission standards in 2020, and the entire vehicle factories and engine factories pay more attention to the national six technologies. The technical routes of the current national heavy diesel engine are that an oxidation catalytic unit (DOC)/a particle capture unit (DPF)/a selective catalytic reduction conversion unit (SCR) and an ammonia oxidation catalytic unit (ASC) are combined in series, and most of the national five diesel engines only contain the selective catalytic reduction conversion unit, so that the national six aftertreatment is more complex than the national five mixed structure and has higher requirement on urea crystallization resistance. In order to meet the requirements of national six school buses or light vehicles, a mixed structure which is more compact in structure, relatively smaller in volume, less in urea crystallization and better in flow field uniformity is designed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a six SCR front end urea mixed structure in state, this urea mixed structure occupation space is little, and what be adapted to school bus, light calorie that can be fine not only can guarantee urea and automobile exhaust intensive mixing, reduction exhaust pollutant concentration that can be obvious has apparent effect to the aspect of anti urea crystallization moreover
The utility model adopts the technical proposal that: a national six SCR front end urea mixing structure comprises a bell mouth cylinder, a heat preservation inner layer cylinder, a rotational flow blade pipe, a stainless steel winding net, a front partition plate, a spoiler, a spherical plug cover, a nozzle seat supporting base and a nozzle seat; the bottom of the rotational flow blade tube is welded with a stainless steel winding net, a combination of the rotational flow blade and the stainless steel winding net is transversely arranged on the heat-insulating inner-layer cylinder, and one end of the heat-insulating inner-layer cylinder is provided with a spherical plug; the heat-preservation inner-layer cylinder is arranged in the horn mouth cylinder; a front clapboard is arranged between the heat-preservation inner-layer cylinder and the bell mouth cylinder; a spoiler is arranged on the inner wall of the horn mouth cylinder positioned on one side of the spherical plug cover; the nozzle seat supporting base is welded on the horn mouth cylinder body at the top of the cyclone blade tube, and the nozzle seat is welded on the nozzle seat supporting base.
Furthermore, the rotational flow blade pipe is a stainless steel pipe, spiral blades are outwards turned on the rotational flow blade pipe, and the blades and the rotational flow blade pipe body form a certain angle.
Further, a temperature sensor base and a differential pressure sensor base are installed on the horn mouth cylinder body.
Furthermore, an annular structure is arranged between the bell mouth cylinder and the heat-insulation inner-layer cylinder, and the annular structure can prolong the passing distance of airflow and ensure that ammonia gas and tail gas are fully mixed; an insulating layer is formed, so that the gas atomization in the inner-layer cylinder body is better ensured; the spherical blanking cover at the rear can enable the airflow to be close to the center, and the uniform distribution of the airflow is ensured, so that the catalytic reaction is more sufficient.
Further, the spoiler is welded between the spherical plug cover and the horn mouth cylinder.
The utility model discloses, for the conventional art, following beneficial effect has:
1. the urea solution is directly sprayed to the rotational flow mixing pipe from the nozzle and is mixed with the spiral tail gas passing through the rotational flow blade pipe. The mixed gas spirally impacts on the stainless steel winding net, the urea atomized liquid is crushed by the stainless steel winding net, and the diameter is further reduced. The high-temperature stainless steel winding net accelerates the evaporation of the urea atomized liquid, so that the tail gas and the urea are mixed more uniformly, the crystallization risk is less, and the efficiency of pollution conversion substances is higher;
2. an annular structure is formed between the inner layer cylinder body and the outer layer cylinder body, and the structure forms a heat insulation layer, so that the risk of low-temperature crystallization of the urea solution is reduced; meanwhile, the structure can lengthen the path of the air flow, utilize the spoiler to prevent the air flow from directly passing through, and utilize the spherical blanking cover to ensure that the air flow is uniformly distributed and the ammonia gas and the tail gas are fully mixed, thereby improving the conversion efficiency of pollutants;
3. the hybrid structure integrates the joint and the outer-layer barrel, so that the structure is more compact, and the whole vehicle is convenient to arrange.
Drawings
FIG. 1 is a schematic view of the mixing structure in general;
FIG. 2 is a schematic view of the gas outlet of the hybrid structure;
FIG. 3 is a schematic structural view after a horn-shaped cylinder is hidden;
in the figure: 1-a horn mouth cylinder body, 2-a heat preservation inner layer cylinder body, 3-a front partition plate, 4-a rotational flow blade pipe, 5-a stainless steel winding net, 6-a nozzle seat supporting base, 7-a nozzle seat, 8-a spherical plug cover, 9-a spoiler, 10-a temperature sensor base and 11-a differential pressure sensor base.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the utility model relates to a six SCR front end urea mixed structure in state, including horn mouth barrel 1, inlayer barrel 2, preceding baffle 3, whirl blade pipe 4, stainless steel winding net 5, nozzle holder support base 6, nozzle holder 7, spherical blanking cover 8, spoiler 9, temperature sensor base 10 and differential pressure sensor base 11.
The bell mouth cylinder 1 covers the outer side of the heat-preservation inner-layer cylinder 2; the front partition plate 3 is positioned between the bell mouth cylinder 1 and the heat-preservation inner layer cylinder 2 and is welded with the bell mouth cylinder 1 and the heat-preservation inner layer cylinder 2, so that an annular cavity can be formed, the path of airflow passing can be lengthened through the annular structure, and the ammonia gas and the tail gas are fully mixed; an insulating layer is formed, so that the gas atomization in the inner-layer cylinder body is better ensured; the spherical blanking cover at the rear can enable the airflow to be close to the center, and the uniform distribution of the airflow is ensured, so that the catalytic reaction is more sufficient. The nozzle holder support base 6 is welded to the nozzle holder 7 and to the bell jar 1. The rotational flow blade pipe 4 and the stainless steel winding net 5 are welded together and then penetrate through and are welded with the inner-layer cylinder body 2 to form a rotational flow mixing structure. The structure can realize the heating effect on mixed gas flow, and has the functions of crushing, evaporating and accelerating hydrolysis on urea, thereby realizing the purpose of non-crystallization. The rotational flow blade pipe 4 is a stainless steel pipe, the spiral blades are outwards turned on the rotational flow blade pipe, and the blades and the rotational flow blade pipe body form a certain angle, so that the rotational speed of the air flow is increased, a vortex is not formed immediately, and the mixing distance of the tail gas and the urea is increased. The stainless steel winding net structure is formed by winding stainless steel wires and is welded with the outer layer pipe by utilizing a brazing process. When tail gas enters the helical blade pipe through the inner-layer cylinder body, the tail gas passes through the stainless steel winding net to play a continuous high-temperature heating role on the stainless steel winding net; the stainless steel winding net is placed in the inner-layer cylinder body, and external air flow also plays a role in high-temperature heating. Tail gas is at gaseous spiral blade pipe 4 and the urea solution that erupts via nozzle holder 7 and is mixed each other, and gas and liquid pass through stainless steel winding net 5 jointly, and high temperature stainless steel winding net 5 makes the urea solution evaporate after hydrolysising for the ammonia, more makes tail gas and ammonia mix more abundant, and the gas of intensive mixing more is favorable to follow-up catalytic reaction.
The spherical plug cover 8 is welded with the inner-layer cylinder body 2 to form an inner-layer cavity; the spoiler 9 is welded between the bell mouth cylinder body 1 and the spherical plug cover 8, and the temperature sensor base 10 and the differential pressure sensor base 11 are welded with the bell mouth cylinder body 1 and are positioned at the front end of the integral mixed structure.
When in use, the tail gas passes through the inner-layer cylinder body 2 after being trapped by particles and then enters the rotational flow blade pipe 4; at this time, the urea solution injected from the nozzle holder 7 is mixed. When the mixed gas passes through the stainless steel winding net 5, the urea atomized liquid in the mixed gas is further crushed, evaporated and hydrolyzed into ammonia gas, so that the crystallization risk is smaller; the ammonia that tail gas and urea after hydrolysising formed gets into in the loop configuration that is formed by horn mouth barrel 1 and inlayer barrel 2 after stainless steel winding net 5 mixes, as shown in figure 3, because of spoiler 9 blocks, the air current can only be upwards circuitous, can increase the mixing distance of tail gas and ammonia, can make the air current flow direction centre draw close when passing through spherical blanking cover 8, guarantees that the gas mixture of selective catalytic reduction conversion unit front end tail gas and ammonia can evenly distributed.
It should be noted that the above-mentioned embodiments are illustrative and not restrictive of the technical solutions of the present invention, and equivalents of those skilled in the art or other modifications made according to the prior art are intended to be included within the scope of the claims of the present invention as long as they do not exceed the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The utility model provides a six SCR front end urea mixed structure which characterized in that: the device comprises a bell mouth cylinder, a heat-preservation inner-layer cylinder, a rotational flow blade pipe, a stainless steel winding net, a front partition plate, a spoiler, a spherical plug cover, a nozzle seat supporting base and a nozzle seat; the bottom of the rotational flow blade tube is welded with a stainless steel winding net, a combination of the rotational flow blade and the stainless steel winding net is transversely arranged on the heat-insulating inner-layer cylinder, and one end of the heat-insulating inner-layer cylinder is provided with a spherical plug; the heat-preservation inner-layer cylinder is arranged in the horn mouth cylinder; a front clapboard is arranged between the heat-preservation inner-layer cylinder and the bell mouth cylinder; a spoiler is arranged on the inner wall of the horn mouth cylinder positioned on one side of the spherical plug cover; the nozzle seat supporting base is welded on the horn mouth cylinder body at the top of the cyclone blade tube, and the nozzle seat is welded on the nozzle seat supporting base.
2. The six-phase SCR front end urea mixing structure according to claim 1, wherein: the shape of the heat-preservation inner-layer cylinder body comprises a circle, an ellipse, a cone or a polyhedron.
3. The six-phase SCR front end urea mixing structure according to claim 1, wherein: the cyclone blade tube is a stainless steel tube, spiral blades are turned outwards, and the blades and the tube body of the cyclone blade tube form a certain angle.
4. The six-phase SCR front end urea mixing structure according to claim 3, wherein: the above-mentioned
The spiral blade shape includes rectangle, trapezoid and triangle.
5. The six-phase SCR front end urea mixing structure according to claim 1, wherein: the front baffle plate and the axis of the bell-mouth cylinder body form a certain angle and are not limited to be vertical.
6. The six-phase SCR front end urea mixing structure according to claim 1, wherein: and a temperature sensor base and a differential pressure sensor base are arranged on the horn mouth cylinder body.
7. The six-phase SCR front end urea mixing structure according to claim 1, wherein: and an annular structure is arranged between the horn mouth cylinder and the heat-insulation inner-layer cylinder.
8. The six-phase SCR front end urea mixing structure according to claim 1, wherein: the spoiler is welded between the spherical plug cover and the horn mouth cylinder body, the number of the spoiler is at least one, and the shape of the spoiler comprises a plane, a spherical surface and other irregular curved surfaces.
9. The six-phase SCR front end urea mixing structure according to claim 1, wherein: the spoiler can be provided with a certain number of holes and can be fully discharged at most.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921294257.7U CN210686095U (en) | 2019-08-12 | 2019-08-12 | Guoliu mixed structure before six SCR |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921294257.7U CN210686095U (en) | 2019-08-12 | 2019-08-12 | Guoliu mixed structure before six SCR |
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| CN210686095U true CN210686095U (en) | 2020-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439658A (en) * | 2019-08-12 | 2019-11-12 | 郑州精益达环保科技有限公司 | A kind of six front end SCR urea mixed structure of state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439658A (en) * | 2019-08-12 | 2019-11-12 | 郑州精益达环保科技有限公司 | A kind of six front end SCR urea mixed structure of state |
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Effective date of registration: 20220831 Address after: 450000 No. 69, 8th Street, economic and Technological Development Zone, Zhengzhou City, Henan Province Patentee after: ZHENGZHOU JINGYIDA AUTO PARTS Co.,Ltd. Address before: No.366, Jingnan 5th Road, 25th Street, Zhengzhou Economic and Technological Development Zone, Henan Province, 450000 Patentee before: ZHENGZHOU JINGYIDA ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |