CN112324538A - Mixing assembly and U-shaped mixer - Google Patents

Mixing assembly and U-shaped mixer Download PDF

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Publication number
CN112324538A
CN112324538A CN202011213221.9A CN202011213221A CN112324538A CN 112324538 A CN112324538 A CN 112324538A CN 202011213221 A CN202011213221 A CN 202011213221A CN 112324538 A CN112324538 A CN 112324538A
Authority
CN
China
Prior art keywords
catalyst
flow
chamber
baffle
baffle plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011213221.9A
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Chinese (zh)
Inventor
齐伟杨
陈勇
王帅
沈峰
沈彩琴
赵治国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Yinlun Machinery Co Ltd
Original Assignee
Zhejiang Yinlun Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Yinlun Machinery Co Ltd filed Critical Zhejiang Yinlun Machinery Co Ltd
Priority to CN202011213221.9A priority Critical patent/CN112324538A/en
Publication of CN112324538A publication Critical patent/CN112324538A/en
Pending legal-status Critical Current

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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]
    • 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
    • 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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • 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

Abstract

The application relates to blender technical field, specifically relates to a hybrid module and U type blender, includes: the catalyst spraying device comprises a first baffle plate and a second baffle plate which are connected with each other, wherein a cavity is formed between the first baffle plate and the second baffle plate, an inlet is formed on the first baffle plate, an outlet and a spraying hole for spraying a catalyst into the cavity are formed on the second baffle plate, so that the gas flow entering the cavity from the inlet can carry the catalyst to flow out from the outlet; and a flow guide part extending into the chamber is formed on the first baffle plate and used for blocking the flow of the gas flow carrying the catalyst. The utility model provides a mixing assembly and blender is provided to present because the mixing space is less in the U type blender, leads to mixing path shorter, and then makes the relatively poor problem of mixed effect.

Description

Mixing assembly and U-shaped mixer
Technical Field
The application relates to the technical field of mixers, in particular to a mixing assembly and a U-shaped mixer.
Background
At present, the requirements for the exhaust emission of motor vehicles are becoming increasingly strict. The SCR technology sprays urea aqueous solution and evaporates and pyrolyzes the urea aqueous solution to generate ammonia (NH) which leads NO in tail gas to be converted into NO in a catalystxThe tail gas is reduced to N to realize tail gas purification, and the U-shaped mixer mostly adopts the technology at present. However, the existing U-shaped mixer has many problems, and the mixing space in the U-shaped mixer is small, which results in a short mixing path and thus poor mixing effect.
Disclosure of Invention
The utility model provides a mixing assembly and U type blender is provided to present because the mixing space is less in the U type blender, leads to the mixing path shorter, and then makes the relatively poor problem of mixed effect.
In order to achieve the purpose, the following technical scheme is adopted in the application:
one aspect of the present application provides a mixing assembly comprising: the catalyst spraying device comprises a first baffle plate and a second baffle plate which are connected with each other, wherein a chamber is formed between the first baffle plate and the second baffle plate, an inlet is formed on the first baffle plate, an outlet and a spraying hole for spraying a catalyst into the chamber are formed on the second baffle plate, so that a gas flow entering the chamber from the inlet can carry the catalyst in the chamber to flow out from the outlet; and a flow guide part extending into the chamber is formed on the first baffle plate and used for blocking the flow of the gas flow carrying the catalyst.
Optionally, the flow guide has a plane for facing the flow direction of the air flow.
The technical scheme has the beneficial effects that: the plane can be arranged so that the flow direction of the airflow is perpendicular to the plane or inclined relative to the plane, thereby increasing the flow path of the airflow.
Optionally, the mixing assembly that this application provided still includes and is located the silk screen spare in the cavity, the silk screen spare install in the water conservancy diversion portion with between the jet orifice to make carry the air current of catalyst flow through in proper order the silk screen spare with the water conservancy diversion portion.
The technical scheme has the beneficial effects that: because the tail gas temperature is higher, and the hole is more in the silk screen spare, it is also relatively more to the hindrance that the air current flows, when the tail gas stream crossed the silk screen spare, can last to produce the effect to the silk screen spare, make silk screen spare temperature rise, silk screen spare temperature is high, then the urea that flows through this silk screen spare as the catalyst decomposes with higher speed, and, contact that can be more abundant between catalyst and the tail gas in the silk screen, and then make tail gas and catalyst misce bene, reduce the crystallization risk, the conversion efficiency of improvement tail gas.
Optionally, there are two outlets, the two outlets are formed on a wall of the second baffle far away from the inlet, a gap is left between the wall and the flow guide portion, and the two outlets are symmetrically arranged on two sides of the flow guide portion in the first direction; the first direction is perpendicular to the arrangement direction of the injection holes and the flow guide parts.
The technical scheme has the beneficial effects that: the airflow flows to the wall after acting on the flow guide part and then acts on the wall to form a flow distribution, and flows out from the two outlets respectively, so that the flowing path of the airflow is further increased, the stirring of the airflow carrying the catalyst is correspondingly increased, the catalyst can be in more sufficient contact with tail gas, and the reaction effect is improved.
Optionally, the mixing assembly provided by the present application further includes two baffles formed on the second baffle, two baffles are installed at the two outlets in a one-to-one correspondence, so as to guide the airflow flowing out from the outlets, and both the baffles are obliquely arranged relative to the first direction, so that the two airflows flowing out from the two outlets flow in directions approaching each other.
The technical scheme has the beneficial effects that: through the change of two guide plates to the air current flow direction, further increased the length that carries the air current flow path of catalyst, and then increased and produce the time of reaction between catalyst and the air current, moreover, set up for the slope of first direction through two guide plates, make from two air currents that the export was flowed to the direction that is close to each other flow, when two air currents collided, can produce more violent stirring, and then make air current and catalyst reaction more abundant.
Optionally, the guide plate is an arc-shaped plate, the guide plate has a cross section perpendicular to the first direction, and the cross section is arc-shaped, so that the concave surface of one of the two arc-shaped plates is opposite to the concave surface of the other arc-shaped plate.
The technical scheme has the beneficial effects that: this makes the air current and the catalyst that flow through the guide plate, can more flow along the minimum of concave face, and then forms more concentrated air current and restraints, and then makes air current and catalyst produce more violent collision.
Optionally, the first baffle is configured to face the airflow flowing to the mixing assembly, and a plurality of through holes communicating with the chamber are formed on the first baffle.
The technical scheme has the beneficial effects that: this results in better mixing of the catalyst with the gas stream.
Another aspect of this application provides a U type blender, including water conservancy diversion chamber casing and the hybrid module that this application provided, be formed with in the water conservancy diversion chamber casing and go out the air cavity and admit air the chamber, hybrid module install in the water conservancy diversion chamber casing, so that the entry orientation admit air the chamber, just export the orientation go out the air cavity.
Optionally, the U-shaped mixer that this application provided still includes the catalyst nozzle install the catalyst nozzle mount pad on the water conservancy diversion chamber casing, the catalyst nozzle install in the catalyst nozzle mount pad, just the catalyst nozzle is used for through the injection orifice to catalyst is sprayed in the cavity.
The technical scheme has the beneficial effects that: thereby facilitating the catalyst to be sprayed into the cavity and leading the catalyst to fully react with the airflow.
Optionally, the U-shaped mixer provided by the application further includes a heat insulating layer, and the heat insulating layer is wrapped outside the diversion cavity housing.
The technical scheme has the beneficial effects that: this allows to maintain a suitably high temperature inside the U-shaped mixer, in particular inside the housing of the flow guiding chamber, which in turn increases the temperature of the catalyst and reduces the risk of crystallization of the catalyst.
The technical scheme provided by the application can achieve the following beneficial effects:
the mixing assembly and the U-shaped mixer that provide in this application embodiment, the air current that carries the catalyst can produce certain stirring under the effect of water conservancy diversion portion when the cavity is flowed through to the circulation, and the air current need walk around the water conservancy diversion portion and flow, and then increases the length of air current flow path in limited space, promotes the mixed effect of catalyst and tail gas.
Additional features of the present application and advantages thereof will be set forth in the description which follows, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It should be apparent that the drawings in the following description are embodiments of the present application and that other drawings may be derived from those drawings by a person of ordinary skill in the art without inventive step.
FIG. 1 is a schematic perspective view of a U-shaped mixer according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of an embodiment of a U-shaped mixer provided in an embodiment of the present application;
FIG. 3 is a perspective view of an embodiment of a hybrid assembly as provided in an example of the present application;
fig. 4 is an exploded view of one embodiment of a hybrid assembly provided in the examples of the present application.
Reference numerals:
100-a flow guide connector;
200-a mixing assembly;
210-a first baffle;
211-a through hole;
212-a flow guide;
220-a second baffle;
221-an injection hole;
230-an inlet;
240-outlet;
250-a baffle;
260-a wire mesh member;
261-a screen body;
262-a housing;
300-a flow guide cavity shell;
310-an air intake chamber;
320-an air outlet cavity;
400-catalyst nozzle mount.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1-4, one aspect of the present application provides a mixing assembly 200 comprising: a first baffle 210 and a second baffle 220 connected with each other, a chamber is formed between the first baffle 210 and the second baffle 220, an inlet 230 is formed on the first baffle 210, an outlet 240 and an injection hole 221 for injecting catalyst into the chamber are formed on the second baffle 220, so that the gas flow entering the chamber from the inlet 230 can flow out of the outlet 240 with the catalyst in the chamber; a flow guide part 212 extending into the chamber is formed on the first baffle 210, and the flow guide part 212 is used for blocking the flow of the gas flow carrying the catalyst. Where hindering means that the gas flow and the catalyst can pass or by-pass, but with certain difficulties.
The mixing assembly 200 provided by the embodiment of the application, when carrying the catalyst, generates a certain stirring effect under the action of the flow guide part 212 when flowing through the chamber, and the airflow needs to bypass the flow guide part 212 to flow, so that the length of the airflow flow path is increased in a limited space, and the mixing effect of the catalyst and the tail gas is improved.
Optionally, in the mixing assembly 200 provided in the embodiment of the present application, the flow guide portion 212 has a plane for facing the flow direction of the airflow. The plane can be arranged so that the flow direction of the airflow is perpendicular to the plane or inclined relative to the plane, thereby increasing the flow path of the airflow. Of course, the plane may be replaced by a point or a wave surface. The flow guide 212 is preferably a plate-like structure.
Optionally, the mixing assembly 200 provided in this embodiment of the present application further includes a screen member 260 located in the chamber, and the screen member 260 is installed between the flow guide portion 212 and the injection hole 221, so that the airflow carrying the catalyst sequentially flows through the screen member 260 and the flow guide portion 212. Because the tail gas temperature is higher, and the hole is more in the silk screen spare 260, it is also relatively more to the hindrance that the air current flows, when the tail gas flows through silk screen spare 260, can continuously exert an effect to silk screen spare 260, make silk screen spare 260 temperature rise, silk screen spare 260 temperature is high, the urea that flows through this silk screen spare 260 as the catalyst has then been accelerated and has been decomposed, and, can more abundant contact between catalyst and the tail gas in the silk screen, and then make tail gas and catalyst misce bene, reduce the crystallization risk, the conversion efficiency of improvement tail gas. Optionally, the screen member 260 may further include a housing 262 and a screen main body 261, so as to fix the shape of the screen main body 261, the housing 262 is preferably a cylindrical member, the cross section of the cylindrical member may be square, circular or triangular, and the like, and the two end ports of the cylindrical member are an inlet 230 of the air flow and an outlet 240 of the air flow.
Optionally, there are two outlets 240, two outlets 240 are formed on a wall of the second baffle 220 away from the inlet 230, a gap is left between the wall and the flow guide portion 212, and the two outlets 240 are symmetrically arranged on two sides of the flow guide portion 212 in the first direction; the first direction is perpendicular to the arrangement direction of the injection holes 221 and the guide parts 212. This makes the gas flow act on the guiding portion 212, and then the gas flow flows to the wall, and then acts on the wall, thereby forming a split flow, and flows out from the two outlets 240, further increasing the flow path of the gas flow, and correspondingly increasing the stirring of the gas flow carrying the catalyst, so that the catalyst can be more fully contacted with the tail gas, and the reaction effect is improved. Of course, two inlets 230 may be provided, and the two inlets 230 are symmetrically disposed on both sides of the flow guide part 212 in the first direction, and the wire mesh 260 is disposed between the inlets 230 and the flow guide part 212, so as to further enhance the reaction effect.
Optionally, the mixing assembly 200 provided in this embodiment of the application further includes two baffles 250 formed on the second baffle 220, the two baffles 250 are correspondingly installed at the two outlets 240 to guide the airflow flowing out from the outlets 240, and each of the two baffles 250 is disposed obliquely with respect to the first direction to enable the two airflows flowing out from the two outlets 240 to flow in a direction approaching each other. Through the change of two guide plates 250 to the air current flow direction, further increased the length that carries the air current flow path of catalyst, and then increased the time that produces the reaction between catalyst and the air current, moreover, set up through two guide plates 250 for the slope of first direction, make from two the export 240 two air currents that flow to the direction that is close to each other, when two air currents collide, can produce more violent stirring, and then make air current and catalyst reaction more abundant.
Optionally, the guide plate 250 is an arc-shaped plate, and the guide plate 250 has a cross section perpendicular to the first direction, and the cross section is arc-shaped, so that the concave surface of one of the two arc-shaped plates is opposite to the concave surface of the other arc-shaped plate. This allows the air and catalyst flowing through the baffle 250 to flow more along the lowest portion of the concave surface, thereby forming a more concentrated air flow bundle, and further causing the air flow to collide with the catalyst more vigorously.
Optionally, the first baffle 210 is configured to face the airflow flowing to the mixing assembly 200, and a plurality of through holes 211 communicating with the chamber are formed on the first baffle 210. This results in better mixing of the catalyst with the gas stream.
Another aspect of the present application provides a U-shaped mixer, which includes a guide chamber housing 300 and the mixing component 200 provided in the embodiment of the present application, an air outlet chamber 320 and an air inlet chamber 310 are formed in the guide chamber housing 300, the mixing component 200 is installed in the guide chamber housing 300, so that the inlet 230 faces the air inlet chamber 310, and the outlet 240 faces the air outlet chamber 320.
The U type blender that provides in this application embodiment has adopted the mixing component 200 that this application embodiment provided, and the air current that carries the catalyst can produce certain stirring under the effect of water conservancy diversion portion 212 when the cavity flows through, and the air current need walk around water conservancy diversion portion 212 and flow, and then increases the length of air current flow path in limited space, promotes the mixed effect of catalyst and tail gas. A guide connector 100 is mounted on the guide chamber housing 300.
Optionally, the U-shaped mixer that this application embodiment provided still includes the catalyst nozzle install catalyst nozzle mount 400 on the water conservancy diversion chamber casing 300, the catalyst nozzle install in catalyst nozzle mount 400, just the catalyst nozzle is used for passing through injection hole 221 to the catalyst is sprayed in the cavity. Thereby facilitating the catalyst to be sprayed into the cavity and leading the catalyst to fully react with the airflow.
Optionally, the U-shaped mixer provided in this application embodiment further includes an insulating layer, and the insulating layer is wrapped outside the diversion cavity housing 300. This allows the U-mixer, and particularly the flow guide chamber housing 300, to be maintained at a suitably high temperature, thereby raising the catalyst temperature and reducing the risk of catalyst crystallization.
To further illustrate the present solution, the present application further provides a specific application example of the mixing assembly 200 and the U-shaped mixer.
In this application example, the mixing assembly may also be referred to as a mixer assembly, the first baffle 210 may also be referred to as an upper baffle, the second baffle 220 may also be referred to as a lower baffle, the inlet 230 may also be referred to as an air inlet, the two outlets 240 may be referred to as a first air outlet and a second air outlet, the mesh element 260 may be referred to as a mesh assembly, the mesh body 261 may be referred to as a wire mesh, and the housing 262 may be referred to as a mesh housing.
In the face of severe environmental problems, the continuous implementation of national six regulations has increasingly strict requirements on the exhaust emissions of motor vehicles. The SCR technology produces ammonia (NH) by spraying aqueous urea solution and evaporating and pyrolyzing the ammonia to convert NO in a catalystxReducing the reaction product to N. Uniformity of ammonia distribution to NO in inlet cross section of catalystxThe conversion of (b) has a significant effect. In addition, if the mixer used to mix the urea and exhaust gases is inefficient, severe urea crystals may form in the exhaust line and the exhaust passage may become blocked, thereby affecting engine performance. Therefore, there is a need to provide a new and improved mixer to solve the above problemsThe above problems are solved.
The application example mainly aims at the defects that a U-shaped side mixing mixer in the prior art is not long enough in mixing path, small in mixing space, poor in mixing effect of tail gas and urea, uneven in ammonia distribution and the like, and provides a mixer for post-treatment of engine tail gas. In the mixer, not only can the injected urea and the tail gas be fully mixed, but also great back pressure can not be generated.
A blender for engine exhaust aftertreatment system, including water conservancy diversion chamber casing and water conservancy diversion chamber connection and install the blender subassembly in the water conservancy diversion intracavity, be equipped with on the water conservancy diversion chamber casing and be used for the installation to the urea nozzle mount pad of spraying urea in the blender subassembly.
The mixer assembly includes an upper baffle, a lower baffle and a wire mesh assembly. The mixer assembly is provided with an air inlet, a first air outlet and a second air outlet, the air inlet is connected with the air inlet cavity, and the air outlet is connected with the air outlet cavity.
The upper baffle plate comprises an upper baffle plate main body and an upper baffle plate flow deflector.
Preferably, the upper baffle main body is provided with a plurality of uniformly distributed flow guide holes, and the flow guide holes are mixed with the urea aqueous solution to achieve a better reaction effect.
The lower baffle comprises a lower baffle urea injection hole and a lower baffle main body.
Preferably, the guide devices are additionally arranged on two sides of the lower baffle plate, so that the airflow can rotate in the circulating process, and the mixing space is increased.
The wire mesh assembly includes a wire mesh and a wire mesh housing.
Preferably, the wire mesh can accelerate the decomposition of urea for tail gas and urea mixture are more even, reduce the crystallization risk, improve the conversion efficiency of tail gas.
The mixer of this application example can lengthen the path of mixing the gas flow and the urea aqueous solution as much as possible without significantly increasing the overall size of the mixer and the exhaust gas aftertreatment device, and can improve the uniformity of mixing in a limited space. And a heat insulation material is arranged on the outer side of the diversion cavity shell. Due to the higher temperature in the inner cavity of the mixer, close to the centre of the mixer, the temperature of the reducing agent injected into the baffle of the mixer can be raised, whereby the risk of urea crystallization can be reduced. The application example provides a U-shaped side mixing improved mixer, which can effectively guide exhaust gas to perform vortex motion and obtain a larger mixing space. Adopt wire mesh in the blender, accelerate the decomposition of urea for tail gas and urea mixture are more even, reduce the crystallization risk.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A mixing assembly, comprising: the catalyst spraying device comprises a first baffle plate and a second baffle plate which are connected with each other, wherein a chamber is formed between the first baffle plate and the second baffle plate, an inlet is formed on the first baffle plate, an outlet and a spraying hole for spraying a catalyst into the chamber are formed on the second baffle plate, so that a gas flow entering the chamber from the inlet can carry the catalyst in the chamber to flow out from the outlet; and a flow guide part extending into the chamber is formed on the first baffle plate and used for blocking the flow of the gas flow carrying the catalyst.
2. The mixing assembly of claim 1, wherein the flow guide has a plane for facing a direction of flow of the airflow.
3. The mixing assembly of claim 1, further comprising a screen member positioned within the chamber, the screen member being mounted between the flow guide and the injection holes such that the catalyst-laden gas stream flows through the screen member and the flow guide in sequence.
4. The mixing assembly of claim 1 wherein there are two of said outlets, two of said outlets being formed in a wall of said second baffle remote from said inlet, said wall being spaced from said deflector, said two outlets being symmetrically disposed on opposite sides of said deflector in a first direction; the first direction is perpendicular to the arrangement direction of the injection holes and the flow guide parts.
5. The mixing assembly of claim 4 further comprising two baffles formed in the second baffle, the two baffles being mounted one-to-one in the two outlets to direct the air streams exiting the outlets, each of the two baffles being angled with respect to the first direction to direct the two air streams exiting the two outlets toward one another.
6. The mixing assembly of claim 5 wherein said baffle is an arcuate plate having a cross-section perpendicular to said first direction, said cross-section being arcuate such that the concave face of one of said arcuate plates is disposed opposite the concave face of the other of said arcuate plates.
7. The mixing assembly according to any one of claims 1 to 6 wherein the first baffle is adapted to face the flow of gas towards the mixing assembly, the first baffle having a plurality of through holes formed therein communicating with the chamber.
A U-shaped mixer comprising a baffle cavity housing having an outlet cavity and an inlet cavity formed therein and a mixing assembly according to any one of claims 1 to 7 mounted in the baffle cavity housing such that the inlet faces the inlet cavity and the outlet faces the outlet cavity.
9. A U-shaped mixer according to claim 8, further comprising a catalyst nozzle, a catalyst nozzle mount mounted on the flow guide chamber housing, the catalyst nozzle being mounted to the catalyst nozzle mount and the catalyst nozzle being for spraying catalyst into the chamber through the spray holes.
10. The U-shaped mixer according to claim 8 or 9, further comprising an insulating layer, wherein the insulating layer is coated outside the diversion cavity housing.
CN202011213221.9A 2020-11-03 2020-11-03 Mixing assembly and U-shaped mixer Pending CN112324538A (en)

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Application Number Priority Date Filing Date Title
CN202011213221.9A CN112324538A (en) 2020-11-03 2020-11-03 Mixing assembly and U-shaped mixer

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Application Number Priority Date Filing Date Title
CN202011213221.9A CN112324538A (en) 2020-11-03 2020-11-03 Mixing assembly and U-shaped mixer

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Publication Number Publication Date
CN112324538A true CN112324538A (en) 2021-02-05

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