Mixing device

Abstract

This utility model belongs to the field of engine aftertreatment technology, specifically relating to a mixing device. The mixing device includes a housing and a flow guide, the flow guide being disposed within the housing. The flow guide includes a swirling tube and a connecting tube. The swirling tube is connected to the air inlet end of the housing, and the connecting tube is located downstream of the swirling tube. The connecting tube has multiple strip-shaped holes, which alter the trajectory of urea particles. This alteration reduces the number of urea particles landing at their original crystallization locations, preventing them from landing in areas with low airflow. Compared to existing mixing device structures that use circular holes in the connecting tube, the strip-shaped holes reduce or even eliminate urea particles landing at crystallization locations in existing structures, thus improving the anti-crystallization capability of the mixing device and effectively solving the crystallization problem.

Description

Technical Field

[0001] This utility model belongs to the field of engine aftertreatment technology, and specifically relates to a mixing device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, mixing devices commonly used in engine aftertreatment systems include a housing and a flow guide. The flow guide includes a swirling tube and a connecting tube disposed within the housing. The swirling tube communicates with the air inlet end of the housing, and the connecting tube is located downstream of the swirling tube. The connecting tube has multiple circular holes that connect the interior and exterior of the flow guide.

[0004] The casing is provided with an interface that communicates with urea particles. The urea particles are sprayed from the interface into the swirl tube. The exhaust gas emitted by the engine enters the swirl tube from the casing. The mixed airflow of exhaust gas and urea particles generates a swirling flow under the action of the swirl tube, and diffuses through the round hole in the connecting tube to the outside of the connecting tube, and then is discharged downstream through the casing.

[0005] The mixed airflow of the mixing device falls at a fixed position below the connecting pipe after passing through the circular hole, causing urea to crystallize at the point where the jet falls. Utility Model Content

[0006] This utility model aims to at least partially solve one of the technical problems in the related art.

[0007] This utility model provides a mixing device, comprising:

[0008] Casing; and

[0009] A flow guide is disposed in the housing. The flow guide includes a swirl tube and a connecting tube. The swirl tube is connected to the air inlet end of the housing. The connecting tube is located downstream of the swirl tube and has multiple strip-shaped holes.

[0010] The strip-shaped orifice alters the trajectory of urea particles, thereby reducing the number of urea particles landing at the original crystallization location. This prevents urea particles from landing in areas with low airflow. Compared to the existing mixing device structure with circular holes on the connecting pipe, the strip-shaped orifice reduces or even eliminates urea particles landing at the crystallization location in the existing structure. This improves the anti-crystallization ability of the mixing device and effectively solves the crystallization problem.

[0011] In some embodiments, the strip-shaped hole extends axially along the connecting pipe.

[0012] As the airflow rotates from the swirl tube into the connecting tube, the axially extending strip-shaped holes on the connecting tube extend in the vertical direction. At this time, when the airflow rotating downwards acts on the side wall of the strip-shaped holes, it collides at an angle with the side wall of the strip-shaped holes. This helps to ensure that the urea particles are broken down under the action of the side wall of the strip-shaped holes, making it easier for the urea particles to react with the waste gas, which is beneficial to improving the mixing effect of the mixing device.

[0013] In some embodiments, the plurality of the strip-shaped holes are arranged parallel to each other and spaced apart along the circumference of the connecting pipe.

[0014] This embodiment helps to ensure the uniformity of airflow along the circumference of the connecting pipe, thereby improving the mixing effect of the mixing device.

[0015] In some embodiments, the strip-shaped hole extends circumferentially along the connecting tube.

[0016] The circumferentially extended strip-shaped holes help increase the collision between the airflow and the sidewall of the connecting pipe, thereby improving the mixing effect of the mixing device.

[0017] In some embodiments, the plurality of strip holes are divided into multiple groups, each group of strip holes is spaced apart circumferentially along the connecting pipe, and the multiple groups of strip holes are parallel and spaced apart axially along the connecting pipe.

[0018] The structure with its strip-shaped holes facilitates the outward diffusion of airflow in a certain pattern within multiple sets of strip-shaped holes, which helps ensure the uniformity of airflow distribution along the circumference of the connecting pipe, thereby improving the mixing effect of the mixing device.

[0019] In some embodiments, the plurality of strip holes are divided into multiple groups, each group of strip holes is spaced apart along the circumference of the connecting pipe, and the multiple groups of strip holes are staggered along the axial direction of the connecting pipe.

[0020] This structure causes the airflow to fall at different locations after passing through different sets of strip holes, which helps to further prevent urea particles from falling in areas with less airflow. Compared with the existing mixing device structure that has circular holes on the connecting pipe, the strip holes reduce the number of urea particles falling in the crystallization locations in the existing structure, which helps to improve the anti-crystallization ability of the mixing device and effectively solve the crystallization problem.

[0021] In some embodiments, the mixing device further includes:

[0022] A rear baffle is disposed on the housing. The rear baffle has an exhaust port located near the lower end of the rear baffle. The lower end of the rear baffle corresponds to the end of the connecting pipe away from the vortex tube.

[0023] This vent reduces airflow obstruction, thus increasing airflow and consequently increasing the airflow through the landing point. This effectively purges the landing point of the urea particle jet, preventing urea crystallization and improving crystallization at the landing point. The vent's location also serves as an auxiliary flow channel, helping to reduce back pressure and further minimizing urea crystallization at the bottom.

[0024] In some embodiments, the mixing device further includes:

[0025] A base plate assembly connected to the end of the connecting pipe remote from the cyclone tube, the base plate assembly being configured to guide downstream flow of air within the connecting pipe; and

[0026] A support plate disposed between the base plate assembly and the housing, the support plate having a support hole, a portion of the base plate assembly abutting at least partially against the contour of the support hole.

[0027] The support holes on the tray can reduce the amount of material used, which helps to reduce the heat conduction path and thus reduce heat loss.

[0028] In some embodiments, the mixing device further includes:

[0029] A front baffle is disposed on the housing. The front baffle has an air inlet located near the lower end of the front baffle, and the lower end of the front baffle corresponds to the end of the connecting pipe away from the swirl tube.

[0030] The air inlet allows the airflow passing through the front baffle to sweep the bottom plate, which helps to improve urea crystallization.

[0031] In some embodiments, the mixing device further includes:

[0032] A base plate assembly connected to the end of the connecting pipe remote from the cyclone tube, the base plate assembly being configured to guide downstream flow of air within the connecting pipe; and

[0033] A support plate is disposed between the base plate assembly and the housing, and the extension direction of the support plate is perpendicular to the exhaust direction of the mixing device.

[0034] The support plate can block the lower bypass airflow, increase the bottom airflow purging effect, and improve the anti-crystallization ability. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the mixing device provided in this embodiment of the utility model. Figure 1 ;

[0037] Figure 2 This is a schematic diagram of the assembly structure of the flow guide provided in this embodiment of the utility model;

[0038] Figure 3 This is a schematic diagram of the structure of the connecting pipe provided in this embodiment of the utility model. Figure 1 ;

[0039] Figure 4 This is a schematic diagram of the structure of the connecting pipe provided in this embodiment of the utility model. Figure 2 ;

[0040] Figure 5 This is a schematic diagram of the structure of the connecting pipe provided in this embodiment of the utility model. Figure 3 ;

[0041] Figure 6 This is a schematic diagram of the structure of the connecting pipe provided in this embodiment of the utility model. Figure 4 ;

[0042] Figure 7 This is a schematic diagram of the structure of the mixing device provided in this embodiment of the utility model. Figure 2 ;

[0043] Figure 8 This is a schematic diagram of the structure of the mixing device provided in this embodiment of the utility model. Figure 3 .

[0044] The markings in the image are as follows:

[0045] 100 - Housing;

[0046] 200 - Flow guide; 210 - Swirl tube; 220 - Connecting tube; 221 - Slotted orifice;

[0047] 300 - Rear bumper; 310 - Exhaust vent; 320 - Exhaust port;

[0048] 400 - Base plate assembly; 410 - First base cover; 420 - Second base cover;

[0049] 500 - Pallet; 510 - Support hole;

[0050] 600 - Front baffle; 610 - Air intake; 620 - Air inlet;

[0051] 700-Support plate. Detailed Implementation

[0052] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0053] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0054] This embodiment provides a mixing device. This device utilizes a urea injection unit installed on the exhaust pipe to spray a measured amount of urea aqueous solution into the exhaust pipe in a mist form. Under certain temperature range and with the action of a catalyst, the urea particles selectively reduce nitrogen oxides in the flue gas into non-toxic nitrogen and water, thus purifying the exhaust gas. This process is called selective catalytic reduction (SCR). The reducing agents include, but are not limited to, ammonia, urea, and hydrocarbons. The reactions occurring in the mixing device include urea decomposition, absorption and desorption of nitrogen trioxide, oxidation of nitrogen trioxide, standard SCR reactions, rapid SCR reactions, and slow SCR reactions.

[0055] like Figure 1 and Figure 2As shown, in this embodiment, the mixing device includes a housing 100 and a flow guide 200. The flow guide 200 is disposed within the housing 100 and includes a swirling pipe 210 and a connecting pipe 220. The swirling pipe 210 is connected to the air inlet of the housing 100, and the connecting pipe 220 is located downstream of the swirling pipe 210. The connecting pipe 220 has multiple strip-shaped holes 221. These strip-shaped holes 221 alter the trajectory of urea particles, thereby reducing the number of urea particles landing at their original crystallization positions. This prevents urea particles from landing at locations with low airflow. Compared to existing mixing device structures that use circular holes in the connecting pipe 220, the strip-shaped holes 221 reduce or even eliminate urea particles landing at crystallization positions in existing structures, thus improving the anti-crystallization capability of the mixing device and effectively solving the crystallization problem.

[0056] Meanwhile, the uniformity of ammonia distribution refers to the distribution uniformity index defined to evaluate the degree of uniformity of ammonia distribution, which is defined as U. vapor The formula is shown below:

[0057]

[0058] In the formula:

[0059] m″ i The ammonia mass fraction value for each grid cell on a certain plane;

[0060] m″ mean This represents the average mass fraction of ammonia on a certain plane.

[0061] A i Let be the area of ​​each cell in a certain plane;

[0062] A represents the area of ​​a certain plane.

[0063] It is evident that the uniformity of ammonia gas distribution has a significant impact on the mixing effect in the mixing device. In this embodiment, a strip-shaped hole 221 is provided on the connecting pipe 220. This structural improvement ensures that the back pressure and ammonia gas uniformity do not deteriorate.

[0064] For ease of explanation, the axis of the connecting pipe 220 is defined as the up-down direction.

[0065] Furthermore, the housing 100 is provided with an interface for connecting to a urea nozzle, which can inject urea particles into the swirl tube 210.

[0066] The cyclone tube 210 has a volute-like rotating flow channel, which allows the airflow entering the cyclone tube 210 to generate a rotating airflow within it. This helps to avoid a low-speed region where urea particles are prone to crystallization within the cyclone tube 210. Simultaneously, the rotating airflow within the cyclone tube 210 helps to increase the airflow velocity, thereby improving the mixing effect.

[0067] like Figure 2 As shown, the mixing device also includes a support plate 700. The support plate 700 is disposed between the base plate assembly 400 and the housing 100. The extension direction of the support plate 700 is perpendicular to the exhaust direction of the mixing device, blocking the lower bypass airflow, increasing the bottom airflow purging effect, and improving the anti-crystallization ability.

[0068] like Figure 3 As shown, in some embodiments, the strip-shaped orifice 221 extends axially along the connecting pipe 220. Since the airflow rotates from the swirl tube 210 into the connecting pipe 220, the axially extending strip-shaped orifice 221 on the connecting pipe 220 extends vertically. At this time, the airflow rotating downwards acts on the sidewall of the strip-shaped orifice 221 and collides at an angle with it. This helps ensure that the urea particles are broken down by the action of the sidewall of the strip-shaped orifice 221, making it easier for the urea particles to react with the exhaust gas, thus improving the mixing effect of the mixing device.

[0069] Furthermore, the multiple strip-shaped holes 221 are arranged parallel and spaced apart along the circumference of the connecting pipe 220, which helps to ensure the uniformity of airflow along the circumference of the connecting pipe 220, thereby improving the mixing effect of the mixing device.

[0070] In some embodiments, such as Figure 3 As shown, a strip-shaped hole 221 is provided along the axial direction of the connecting pipe 220. The length of the strip-shaped hole 221 is similar to the axial length of the connecting pipe 220, which helps to increase the flow area of ​​the airflow through the strip-shaped hole 221.

[0071] In other embodiments, please refer to Figure 4 At least two strip-shaped holes 221 are provided along the axial direction of the connecting pipe 220 to ensure the flow area of ​​the airflow through the strip-shaped holes 221.

[0072] In some embodiments, such as Figure 5 and Figure 6 As shown, the strip-shaped hole 221 extends circumferentially along the connecting pipe 220, which helps to increase the collision between the airflow and the side wall of the connecting pipe 220, thereby improving the mixing effect of the mixing device.

[0073] Further, please see Figure 5 Multiple strip holes 221 are divided into multiple groups, and each group of strip holes 221 is arranged at intervals along the circumference of the connecting pipe 220. The multiple groups of strip holes 221 are parallel and spaced along the axial direction of the connecting pipe 220, so that the airflow diffuses outward in a certain pattern in the multiple groups of strip holes 221. This helps to ensure the uniformity of the airflow distribution along the circumference of the connecting pipe 220, thereby improving the mixing effect of the mixing device.

[0074] like Figure 6As shown, multiple strip-shaped holes 221 are divided into multiple groups, with each group of strip-shaped holes 221 spaced apart circumferentially along the connecting pipe 220, and the multiple groups of strip-shaped holes 221 staggered along the axial direction of the connecting pipe 220. This structure causes the airflow to fall at different points after passing through different groups of strip-shaped holes 221, which helps to further prevent urea particles from falling in areas with less airflow. Compared with the existing mixing device structure that sets circular holes on the connecting pipe 220, the strip-shaped holes 221 reduce the number of urea particles falling at the crystallization positions in the existing structure, which helps to improve the anti-crystallization ability of the mixing device and effectively solve the crystallization problem.

[0075] At the same time, by adjusting the direction (horizontal or vertical), length, width, number of layers, angle (slanted distribution), and staggering of the strips, the overall back pressure and ammonia uniformity of the optimized post-treatment are ensured to remain unaffected.

[0076] like Figure 7 As shown, the mixing device also includes a rear baffle 300, which is disposed on the housing 100. The rear baffle 300 has an exhaust port 310, which is located near the lower end of the rear baffle 300. The lower end of the rear baffle 300 corresponds to the end of the connecting pipe 220 away from the swirl tube 210. This exhaust port 310 helps to reduce obstruction to the airflow, thus increasing the airflow rate. This, in turn, increases the airflow rate through the landing point, achieving purging of the urea particle jet landing point, which helps to prevent urea from crystallizing at the landing point and improves the crystallization at the landing point. The location of the exhaust port 310 is an auxiliary flow channel, which helps to reduce back pressure and thus reduce urea crystallization in the lower part.

[0077] In addition, the rear baffle 300 is provided with an exhaust port 320 connected to the downstream structure of the mixing device, and the exhaust gas after oxidation and reduction by the mixing device is discharged from the mixing device through the exhaust port 320.

[0078] like Figure 2 , Figure 7 and Figure 8 As shown, the mixing device also includes a base plate assembly 400 and a support plate 500. The base plate assembly 400 is connected to the end of the connecting pipe 220 away from the swirl tube 210. The base plate assembly 400 is configured to guide the downstream flow of airflow within the connecting pipe 220. The support plate 500 is disposed between the base plate assembly 400 and the housing 100. The support plate 500 has a support hole 510, and a portion of the base plate assembly 400 at least partially abuts against the contour of the support hole 510. The support hole 510 on the support plate 500 reduces material usage, which helps to reduce the heat conduction path and thus reduce heat loss.

[0079] The base plate assembly 400 includes a first base cover 410 and a second base cover 420. The first base cover 410 is connected to the end face of the connecting pipe 220 away from the vortex pipe 210. The first base cover 410 is provided with a connecting hole. The second base cover 420 is spaced apart from the first base cover 410 so that the airflow in the connecting pipe 220 can be discharged from the connecting hole and then discharged to the rear baffle 300 side under the obstruction of the second base cover 420.

[0080] Please see Figure 2 and Figure 8 The mixing device also includes a front baffle 600, which is disposed on the housing 100. The front baffle 600 has an air inlet 610, which is located near the lower end of the front baffle 600. The lower end of the front baffle 600 corresponds to the end of the connecting pipe 220 away from the swirling pipe 210, so that the airflow passing through the front baffle 600 can purify the bottom plate, which is beneficial to improving urea crystallization.

[0081] In addition, the front baffle 600 also has an air inlet 620 connected to the upstream structure of the mixing device. The exhaust gas emitted by the engine enters the swirl tube 210 through the air inlet 620, and after passing through the swirl tube 210 to generate a rotating airflow, it enters the connecting tube 220.

[0082] This hybrid device is highly versatile and modular.

[0083] The operation process of the mixing device will now be explained with reference to the diagram:

[0084] First, the exhaust gas generated by the engine enters the swirl tube 210 through the air intake 620. At the same time, urea particles are injected into the swirl tube 210 by the urea nozzle. The mixture of urea particles and exhaust gas swirls through the swirl tube 210 and flows to the connecting pipe 220.

[0085] The mixed gas rotates in the connecting pipe 220, diffuses outward through the strip hole 221, and then is guided by the bottom plate assembly 400 below the connecting pipe 220 before being discharged from the mixing device through the exhaust port 320.

[0086] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0089] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0090] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mixing device, characterized in that, include: Casing (100); as well as A flow guide (200) is disposed in the housing (100). The flow guide (200) includes a swirling tube (210) and a connecting tube (220). The swirling tube (210) is connected to the air inlet end of the housing (100). The connecting tube (220) is located downstream of the swirling tube (210) and has a plurality of strip-shaped holes (221).

2. The mixing device according to claim 1, characterized in that, The strip-shaped hole (221) extends along the axial direction of the connecting pipe (220).

3. The mixing device according to claim 2, characterized in that, The plurality of the strip holes (221) are arranged parallel to each other and spaced apart along the circumference of the connecting pipe (220).

4. The mixing device according to claim 1, characterized in that, The strip-shaped hole (221) extends circumferentially along the connecting pipe (220).

5. The mixing apparatus according to claim 4, characterized in that, The multiple strip holes (221) are divided into multiple groups, and each group of strip holes (221) is arranged at intervals along the circumference of the connecting pipe (220). The multiple groups of strip holes (221) are arranged parallel and at intervals along the axial direction of the connecting pipe (220).

6. The mixing apparatus according to claim 1, characterized in that, The multiple strip holes (221) are divided into multiple groups, and each group of strip holes (221) is arranged at intervals along the circumference of the connecting pipe (220). The multiple groups of strip holes (221) are arranged alternately along the axial direction of the connecting pipe (220).

7. The mixing apparatus according to any one of claims 1-6, characterized in that, The mixing device further includes: A rear baffle (300) is disposed on the housing (100). The rear baffle (300) has an exhaust port (310) disposed near the lower end of the rear baffle (300). The lower end of the rear baffle (300) corresponds to the end of the connecting pipe (220) away from the swirling pipe (210).

8. The mixing apparatus according to any one of claims 1-6, characterized in that, The mixing device further includes: A base plate assembly (400) connected to one end of the connecting pipe (220) away from the vortex tube (210), the base plate assembly (400) being configured to guide the downstream flow of airflow within the connecting pipe (220); and A tray (500) is disposed between the base plate assembly (400) and the housing (100), the tray (500) having a support hole (510), a portion of the base plate assembly (400) abutting at least partially against the contour of the support hole (510).

9. The mixing apparatus according to any one of claims 1-6, characterized in that, The mixing device further includes: A front baffle (600) is disposed on the housing (100). The front baffle (600) has an air inlet (610) disposed near the lower end of the front baffle (600). The lower end of the front baffle (600) corresponds to the end of the connecting pipe (220) away from the swirl pipe (210).

10. The mixing apparatus according to any one of claims 1-6, characterized in that, The mixing device further includes: A base plate assembly (400) connected to one end of the connecting pipe (220) away from the vortex tube (210), the base plate assembly (400) being configured to guide the downstream flow of airflow within the connecting pipe (220); and A support plate (700) is disposed between the base plate assembly (400) and the housing (100), and the extension direction of the support plate (700) is perpendicular to the exhaust direction of the mixing device.

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