CN213598043U

CN213598043U - Mixer for SCR system

Info

Publication number: CN213598043U
Application number: CN202022230401.XU
Authority: CN
Inventors: 崔建华; 傅栋; 童卫琴
Original assignee: Hangzhou Runbaolan Environmental Protection Technology Co ltd
Current assignee: Hangzhou Runbaolan Environmental Protection Technology Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-07-02
Anticipated expiration: 2030-10-09

Abstract

The utility model discloses a blender for SCR system, including mixing box, SCR catalytic unit, the flange is installed to the left and right sides of mixing box, and the mixing box passes through the flange to be connected with the SCR catalytic unit on right side. Through the first stirring mixer and the second stirring mixer of design, smash the upset to the urea spraying, the air current that the stirring leaf passes through the entering of tail gas is rotatory, carries out the air current upset to the spraying, and the upset of tail gas air current makes tail gas and urea spraying mix more evenly to accelerate the decomposition of urea solution. Through the design, cut apart into two parts with the entering of tail gas, the tail gas of top directly plays urea spraying after getting into, and the tail gas of below gets into the back through the gas collecting channel, has the air discharge opening of shunt tubes top to its reposition of redundant personnel, makes the trend of tail gas multiline, makes the disturbance of air current more chaotic. Through being provided with the arc, carry out the disturbance to the gas that finally flows out and unload the branch pipe, make tail gas evaporate with urea once more, decomposition reaction.

Description

Mixer for SCR system

Technical Field

The utility model relates to a diesel engine tail gas aftertreatment technical field specifically is a blender for SCR system.

Background

Selective catalytic conversion system scr (selective catalytic reduction) for diesel engines refers to a catalytic reduction device installed in the exhaust system of a diesel vehicle to catalytically reduce NOx in diesel engine emissions to N2 and O2, with urea water solution being the reductant. Aqueous urea is injected into the exhaust pipe upstream of the catalyst and is hydrolyzed under the influence of the exhaust gas temperature and the gas flow to produce CO2 and ammonia, which acts as a reductant to reduce NOx to non-polluting nitrogen and water.

The decomposition rate of urea at the inlet of the SCR system reactor and the uniformity of ammonia distribution have important influence on the conversion efficiency of nitrogen oxides in the reactor, the overall performance of the whole urea SCR system is directly influenced, the urea and tail gas are not uniformly mixed, the conversion efficiency of the nitrogen oxides in the SCR reactor and the utilization rate of the urea are both low, and the ammonia escape rate is high. In addition, in the mixer of the conventional SCR system, in order to achieve a good mixing effect of the mixer, a relatively complicated mixer structure is generally provided, which may increase exhaust resistance and power consumption of the diesel engine.

Accordingly, the present invention provides a mixer for an SCR system to solve the problems set forth in the background art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a blender for SCR system to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a blender for SCR system, includes mixing box, SCR catalytic device, the flange is installed to the left and right sides of mixing box, and the mixing box passes through the flange to be connected with the SCR catalytic device on right side, installs temperature sensor on mixing box upper end right side, is provided with the urea pipe in temperature sensor's left side, and the lower extreme of urea pipe is connected with the urea shower nozzle, is provided with the gas collecting channel in the below of urea shower nozzle, is provided with the fixed block in the below of gas collecting channel, and the right-hand member of gas collecting channel is connected with the shunt tubes, a plurality of wind gaps of unloading have been seted up to the inside upper end of shunt tubes, and the right-hand member of shunt tubes is connected with the arc, is provided with first stirring mixer in the.

As a further proposal of the utility model, the first stirring mixer is the same with the second stirring mixer structure including bracing piece, pivot, fixing base, stirring leaf and diffluence hole.

As the utility model discloses scheme further again, upper end of the support bar and mixing box inner wall fixed connection, bracing piece lower extreme and pivot fixed connection, the equal activity joint in both ends has the fixing base about the pivot, and a plurality of diffluent orifices have been seted up to all sides fixedly connected with stirring leaf of fixing base on stirring the leaf.

As the utility model discloses the scheme of furthering again, the gas collecting channel passes through fixed block and mixing box inner wall fixed connection, gas collecting channel and shunt tubes fixed connection, shunt tubes and arc fixed connection.

As the utility model discloses further scheme again, a plurality of unloads wind gap evenly distributed in the below of stirring leaf.

As the utility model discloses scheme further again, urea pipe and urea shower nozzle fixed connection, the urea shower nozzle corresponds with first stirring mixer inside the mixing box.

Compared with the prior art, the beneficial effects of the utility model are that:

1. through the first stirring mixer and the second stirring mixer of design, smash the upset to the urea spraying, the air current that the stirring leaf passes through the entering of tail gas is rotatory, carries out the air current upset to the spraying, and the upset of tail gas air current makes tail gas and urea spraying mix more evenly to accelerate the decomposition of urea solution.

2. Through the design, cut apart into two parts with the entering of tail gas, the tail gas of top directly plays urea spraying after getting into, and the tail gas of below gets into the back through the gas collecting channel, has the air discharge opening of shunt tubes top to its reposition of redundant personnel, makes the trend of tail gas multiline, makes the disturbance of air current more chaotic.

3. Through being provided with the arc, carry out the disturbance to the gas that finally flows out and unload the branch pipe, make tail gas evaporate with urea once more, decomposition reaction.

Drawings

Fig. 1 is a schematic view of a mixer for an SCR system.

Fig. 2 is a schematic diagram of a gas collecting channel in a mixer for an SCR system.

Fig. 3 is a schematic view of the flow of exhaust gas in a mixer for an SCR system.

Fig. 4 is a schematic diagram of a mixer at a for an SCR system.

In the figure: 1. a mixing box; 2. an SCR catalytic device; 3. a urea conduit; 4. a temperature sensor; 5. a first agitator mixer; 6. a second agitator mixer; 7. a support bar; 8. a rotating shaft; 9. a urea spray head; 10. a gas-collecting hood; 11. a shunt tube; 12. an air outlet is discharged; 13. a fixed seat; 14. stirring blades; 15. an arc-shaped plate; 16. a flange; 17. a shunt hole; 18. and (5) fixing blocks.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 4, in an embodiment of the present invention, a mixer for an SCR system includes a mixing box 1 and an SCR catalytic device 2, flanges 16 are installed on left and right sides of the mixing box 1, the mixing box 1 is connected to the SCR catalytic device 2 on the right side through the flanges 16, a temperature sensor 4 is installed on the right side of the upper end of the mixing box 1, a urea conduit 3 is installed on the left side of the temperature sensor 4, the urea conduit 3 is fixedly connected to a urea nozzle 9, the urea nozzle 9 corresponds to a first stirring mixer 5 inside the mixing box 1, the lower end of the urea conduit 3 is connected to the urea nozzle 9, a gas collecting hood 10 is installed below the urea nozzle 9, the gas collecting hood 10 is fixedly connected to the inner wall of the mixing box 1 through a fixing block 18, the gas collecting hood 10 is fixedly connected to a shunt tube 11, the shunt tube 11 is fixedly connected to an arc-shaped plate 15, the fixing block 18 is, the right end of gas collecting channel 10 is connected with shunt tubes 11, a plurality of air discharge ports 12 have been seted up to shunt tubes 11 inside upper end, air discharge ports 12 evenly distributed is in the below of stirring leaf 14, shunt tubes 11's right-hand member is connected with arc 15, be provided with first stirring mixer 5 in shunt tubes 11's top, first stirring mixer 5's right side is provided with second stirring mixer 6, including bracing piece 7 in first stirring mixer 5, pivot 8, fixing base 13, stirring leaf 14 and reposition of redundant personnel hole 17, first stirring mixer 5 is the same with second stirring mixer 6 structure, bracing piece 7 upper end and mixing box 1 inner wall fixed connection, bracing piece 7 lower extreme and pivot 8 fixed connection, both ends all movable joint has fixing base 13 about pivot 8, the week side fixed connection of fixing base 13 has stirring leaf 14, a plurality of reposition of redundant personnel hole holes hole 17 have been seted up on stirring leaf 14.

The utility model discloses a theory of operation is:

first stirring mixer 5 in mixing box 1 is the same with second stirring mixer 6 structure, because of bracing piece 7 lower extreme and pivot 8 fixed connection in first stirring mixer 5, both ends all activity joint has fixing base 13 about pivot 8, and the week side fixedly connected with stirring leaf 14 of fixing base 13 has seted up a plurality of diffluent orifices 17 on stirring leaf 14, so can the free rotation with the stirring leaf 14 that fixing base 13 is connected.

The exhaust gas is divided into two parts when entering through the gas collecting hood 10.

The tail gas of top gets into the back and mixes with the urea spraying, and the temperature of tail gas is generally higher, and urea after the atomizing still constantly evaporates when mixing with tail gas, and the airflow that drives when stirring leaf 14 gets into through tail gas is rotatory, and is provided with a plurality of diffluence holes 17 on the stirring leaf 14, carries out the air current upset to the spraying, and the upset of air current makes the more even that tail gas and urea spraying mix, and the temperature of tail gas accelerates the decomposition of urea solution.

After the tail gas of below gets into through gas collecting channel 10, there is the air discharge opening 12 of shunt tubes 11 top to its reposition of redundant personnel, makes the trend multilineage of tail gas, makes the disturbance of air current more chaotic, finally remains the tail gas and passes through shunt tubes 11 and the collision of arc 15, makes the tail gas upflow evaporate with urea once more, decomposition reaction.

And finally, after urea pyrolysis reaction, NH3 is generated and enters an SCR catalytic device, NOx is reduced by NH3 in the SCR catalytic device, N2 is discharged, and redundant NH3 is chlorinated into N2.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A mixer for an SCR system comprises a mixing box (1) and an SCR catalytic device (2), and is characterized in that flanges (16) are installed on the left side and the right side of the mixing box (1), the mixing box (1) is connected with the SCR catalytic device (2) on the right side through the flanges (16), a temperature sensor (4) is installed on the right side of the upper end of the mixing box (1), a urea conduit (3) is arranged on the left side of the temperature sensor (4), the lower end of the urea conduit (3) is connected with a urea spray nozzle (9), a gas collecting hood (10) is arranged below the urea spray nozzle (9), a fixing block (18) is arranged below the gas collecting hood (10), a shunt pipe (11) is connected with the right end of the gas collecting hood (10), a plurality of air discharge ports (12) are formed in the upper end of the interior of the shunt pipe (11), and an arc-shaped, a first stirring mixer (5) is arranged above the shunt pipe (11), and a second stirring mixer (6) is arranged on the right side of the first stirring mixer (5).

2. The mixer for the SCR system according to claim 1, wherein the first stirring mixer (5) comprises a support rod (7), a rotating shaft (8), a fixed seat (13), a stirring blade (14) and a diversion hole (17), and the first stirring mixer (5) and the second stirring mixer (6) have the same structure.

3. The mixer for the SCR system according to claim 2, wherein the upper end of the support rod (7) is fixedly connected with the inner wall of the mixing box (1), the lower end of the support rod (7) is fixedly connected with the rotating shaft (8), the left end and the right end of the rotating shaft (8) are movably clamped with fixing seats (13), the circumferential sides of the fixing seats (13) are fixedly connected with stirring blades (14), and the stirring blades (14) are provided with a plurality of shunting holes (17).

4. A mixer for an SCR system according to claim 1, characterized in that the gas collecting channel (10) is fixedly connected to the inner wall of the mixing tank (1) by means of a fixing block (18), the gas collecting channel (10) is fixedly connected to the flow dividing pipe (11), and the flow dividing pipe (11) is fixedly connected to the curved plate (15).

5. A mixer for an SCR system according to claim 1, characterized in that the several air discharge openings (12) are evenly distributed below the stirring vane (14).

6. Mixer for SCR system according to claim 1, characterized in that the urea conduit (3) is fixedly connected with a urea spray head (9), the urea spray head (9) corresponding to the first mixer-agitator (5) inside the mixing tank (1).