Rectifier plate and post-processing system
By designing rectifier plates with outlet holes of different areas and flow dividers, the problem of uneven mixed gas concentration was solved, and uniform gas flow distribution in front of the SCR catalyst support unit was achieved, which improved NOx conversion efficiency and reduced back pressure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-10
Smart Images
Figure CN224478972U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engine technology, and in particular relates to a rectifier plate and an after-treatment system. Background Technology
[0002] The fairing is used in the engine aftertreatment system. Its function is to ensure that the mixed gas enters the SCR (Selective Catalytic Reduction) catalyst carrier evenly to undergo chemical reaction.
[0003] However, existing rectifiers are rectifiers with evenly distributed circular holes. Their mixing effect on the mixed gas is weak in the direction perpendicular to the flow direction of the mixed gas. They can only improve the velocity distribution of the mixed gas in the pipe cross section, and have little effect on improving the velocity distribution of the mixed gas in the pipe cross section, resulting in uneven distribution of mixed gas concentration. Utility Model Content
[0004] This utility model aims to at least partially solve one of the technical problems in the related art.
[0005] This utility model provides a rectifier plate, comprising:
[0006] The body has a first vent and a second vent, the area of the first vent is larger than the area of the second vent, and the second vent is closer to the edge of the body than the first vent.
[0007] A first diverter, the first diverter having a first end and a second end opposite to the first end;
[0008] Both the first end and the second end are connected to a portion of the body that defines the first air outlet, and the orthographic projection of the first diverter is located within the first air outlet along the axial direction of the body.
[0009] In some embodiments, the first diverter protrudes from the body and has an arc-shaped structure.
[0010] In some embodiments, the body has a third vent, which is spaced apart from the first vent. The area of the third vent is larger than the area of the second vent, and the second vent is closer to the edge of the body than the third vent.
[0011] In some embodiments, the body has a center line, and the third vent and the first vent are symmetrically arranged along the center line.
[0012] In some embodiments, a second diverter is further included, the second diverter having a fifth end and a sixth end opposite to the fifth end, a portion of the body defining the third vent having a seventh end and an eighth end opposite to the seventh end, the fifth end being connected to the seventh end, the sixth end being connected to the eighth end, and the orthographic projection of the second diverter along the axial direction of the body being located within the third vent.
[0013] In some embodiments, the second diverter protrudes from the body and has an arc-shaped structure.
[0014] In some embodiments, the body has a first groove, and the second air outlet is uniformly disposed at the bottom of the first groove.
[0015] In some embodiments, the body has a second groove, the second groove including a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove being respectively disposed at both ends of the first groove along the circumference of the body, and both the first sub-groove and the second sub-groove extending along the circumference of the body.
[0016] In some embodiments, the body has a third groove, the third groove and the second groove are respectively disposed at both ends of the first vent, and the third groove extends circumferentially along the body.
[0017] This utility model also provides an aftertreatment system, including: an exhaust pipe, a mixer, an SCR catalyst carrier unit, and the above-mentioned rectifier plate, wherein the mixer, the rectifier plate, and the SCR catalyst carrier unit are sequentially arranged in the exhaust pipe along the exhaust direction.
[0018] The rectifier plate provided by this utility model includes a body and a first flow divider. The body has a first air outlet and a second air outlet. The area of the first air outlet is larger than the area of the second air outlet. The first air outlet can increase the airflow area, which is more conducive to airflow and can reduce back pressure. The second air outlet can provide resistance to airflow. The first flow divider can split the airflow from the second air outlet into at least two parts, so that the airflow from the second air outlet collides with the airflow from the first air outlet, increasing the airflow path and making the airflow distribution more uniform. Attached Figure Description
[0019] 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.
[0020] Figure 1 This is a schematic diagram of the structure of a post-processing system provided in one embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram of the structure of a rectifier plate provided in one embodiment of the present invention. Figure 1 ;
[0022] Figure 3 This is a schematic diagram of the structure of a rectifier plate provided in one embodiment of the present invention. Figure 2 .
[0023] Figure label:
[0024] 10. Post-processing system;
[0025] 1. Exhaust pipe;
[0026] 2. Mixer;
[0027] 3. SCR catalyst support unit;
[0028] 4. Rectifier plate;
[0029] 41. Body; 411. First vent; 412. Second vent; 413. Third vent; 414. First groove; 415. Second groove; 4151. First sub-groove; 4152. Second sub-groove; 416. Third groove;
[0030] 42. First diversion component; 421. First end; 422. Second end;
[0031] 43. Second diverter; 431. Fifth end; 432. Sixth end;
[0032] 44. Flip the edge. Detailed Implementation
[0033] 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.
[0034] 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.
[0035] A rectifier plate includes a body and a first splitter. The body has a first vent and a second vent. The area of the first vent is larger than the area of the second vent. The second vent is closer to the edge of the body than the first vent. The first splitter has a first end and a second end opposite to the first end. Both the first end and the second end are connected to a portion of the body defining the first vent. Along the axial direction of the body, the orthographic projection of the first splitter lies within the first vent.
[0036] The rectifier plate provided by this utility model includes a body and a first flow divider. The body has a first air outlet and a second air outlet. The area of the first air outlet is larger than the area of the second air outlet. The first air outlet can increase the airflow area, which is more conducive to airflow and can reduce back pressure. The second air outlet can provide resistance to airflow. The first flow divider can split the airflow from the second air outlet into at least two parts, so that the airflow from the second air outlet collides with the airflow from the first air outlet, increasing the airflow path and making the airflow distribution more uniform.
[0037] like Figure 1 As shown, the aftertreatment system 10 includes an exhaust pipe 1, a mixer 2, an SCR catalyst carrier unit 3, and a rectifier plate 4. The mixer 2, the rectifier plate 4, and the SCR catalyst carrier unit 3 are sequentially arranged in the exhaust pipe 1 along the exhaust direction.
[0038] The exhaust gas emitted by the engine is fully mixed with NH3 (ammonia) generated by the decomposition of urea in mixer 2. Under the high temperature of the exhaust gas, it undergoes catalytic conversion in SCR catalyst carrier unit 3, which plays a role in purifying the exhaust gas.
[0039] SCR (Selective Catalytic Reduction) refers to the selective catalytic reduction technology. It involves the reductive denitrification reaction of NH3 (ammonia) and NOx (nitrogen oxides) in the presence of a catalyst, producing N2 nitrogen and H2O (water).
[0040] like Figure 2 and Figure 3 As shown, in some embodiments, the rectifier plate 4 includes a body 41 and a first flow divider 42. The body 41 has a first vent 411 and a second vent 412. The area of the first vent 411 is larger than the area of the second vent 412, and the second vent 412 is closer to the edge of the body 41 than the first vent 411. When the mixed gas from the mixer 2 passes through the rectifier plate 4, the larger area of the first vent 411 increases the flow area of the mixed gas, which is more conducive to the flow of the mixed gas and can reduce back pressure. When the mixed gas from the mixer 2 passes through the rectifier plate 4, the smaller area of the second vent 412 provides resistance to the flow of the mixed gas, preventing the mixed gas from passing through the rectifier plate 4 too quickly.
[0041] The first diverter 42 has a first end 421 and a second end 422 opposite to the first end 421. Both the first end 421 and the second end 422 are connected to a portion of the body 41 defining the first outlet 411. Along the axial direction of the body 41, the orthographic projection of the first diverter 42 is located within the first outlet 411. When the mixed gas exiting the mixer 2 passes through the first outlet 411, the first diverter 42 can divide the mixed gas passing through the first outlet 411 into at least two streams. The mixed gas after being diverted by the first diverter 42 will collide with the mixed gas flowing through the second outlet 412, resulting in a higher uniformity of NH3 (ammonia) distribution before the SCR catalyst support unit 3 and improving the NOx (nitrogen oxides) conversion efficiency.
[0042] Specifically, a portion of the body 41 that defines the first vent 411 has a third end and a fourth end opposite to the third end, with the first end 421 connected to the third end and the second end 422 connected to the fourth end.
[0043] In some embodiments, the width of the first diverter 42 first decreases and then increases along the direction from the first end 421 to the second end 422.
[0044] The uniformity of ammonia distribution refers to the distribution uniformity index, defined to evaluate the degree of uniformity in ammonia distribution. The distribution uniformity index is defined as U0. vapor The formula is shown below:
[0045]
[0046] In the formula:
[0047] m″ i The ammonia mass fraction value for each grid cell on a certain plane;
[0048] m″ mean This represents the average mass fraction of ammonia on a certain plane.
[0049] A i Let be the area of each cell in a certain plane;
[0050] A represents the area of a certain plane.
[0051] In some embodiments, the first diverter 42 protrudes from the body 41 and has an arc-shaped structure. By making the first diverter 42 protrude from the body 41 and have an arc-shaped structure, the mixed gas can be divided into four streams by the first diverter 42 when passing through the first outlet 411. This increases the collision between the mixed gas flowing out of the first outlet 411 and the mixed gas flowing out of the second outlet 412, resulting in a more uniform distribution of NH3 (ammonia) before the SCR catalyst support unit 3 and improving the conversion efficiency of NOx (nitrogen oxides).
[0052] In some embodiments, the area ratio of the second outlet 412 to the first outlet 411 is 0.2-0.4. The larger area of the first outlet 411 facilitates the flow of the mixed gas, resulting in lower back pressure. The smaller area of the second outlet 412 ensures that there is some resistance when the mixed gas flows through it, preventing it from flowing directly through the rectifier plate 4. This increases the mixing path of the mixed gas, improves mixing uniformity, and results in a more uniform distribution of NH3 (ammonia) before the SCR catalyst support unit 3, thereby improving the conversion efficiency of NOx (nitrogen oxides).
[0053] Specifically, the ratio of the area of the second vent 412 to the area of the first vent 411 can be 0.2, 0.3, 0.4 or any two of the above values.
[0054] In some embodiments, the first outlet 411 is an elliptical orifice. By setting the first outlet 411 to an elliptical orifice, the mixed gas after passing through the first outlet 411 can move along the long axis of the first outlet 411, improving the mixing uniformity and making the distribution of NH3 (ammonia) in front of the SCR catalyst support unit 3 more uniform, thereby improving the conversion efficiency of NOx (nitrogen oxides).
[0055] Specifically, the second vent 412 is located on one side along the long axis of the first vent 411.
[0056] Of course, in other embodiments, the first vent 411 can also be configured as a circular hole or a polygonal hole.
[0057] In some embodiments, the body 41 has a third vent 413, which is spaced apart from the first vent 411. The area of the third vent 413 is larger than the area of the second vent 412, and the second vent 412 is closer to the edge of the body 41 than the third vent 413. When the mixed gas exiting the mixer 2 passes through the rectifier plate 4, the larger area of the third vent 413 increases the flow area of the mixed gas, which is more conducive to the flow of the mixed gas and can reduce the back pressure.
[0058] In some embodiments, the area ratio of the second outlet 412 to the third outlet 413 is 0.2-0.4. The larger area of the third outlet 413 facilitates the flow of the mixed gas, resulting in lower back pressure. The smaller area of the second outlet 412 ensures that there is some resistance when the mixed gas flows through it, preventing it from flowing directly through the rectifier plate 4. This increases the mixing path of the mixed gas, improves mixing uniformity, and results in a more uniform distribution of NH3 (ammonia) before the SCR catalyst support unit 3, thereby improving the conversion efficiency of NOx (nitrogen oxides).
[0059] Specifically, the ratio of the area of the second vent 412 to the area of the third vent 413 can be 0.2, 0.3, 0.4 or any two of the above values.
[0060] In some embodiments, the body has a centerline, and the third vent 413 and the first vent 411 are symmetrically arranged along the centerline. By symmetrically arranging the third vent 413 and the first vent 411 along the centerline, the mixed gas flowing out of the third vent 413 and the mixed gas flowing out of the first vent 411 are more uniform.
[0061] In some embodiments, the third vent 413 has the same area as the first vent 411.
[0062] In some embodiments, the rectifier plate 4 further includes a second diverter 43 having a fifth end 431 and a sixth end 432 opposite to the fifth end 431. Both the fifth end 431 and the sixth end 432 are connected to a portion of the body 41 defining the third outlet 413. The orthographic projection of the second diverter 43 along the axial direction of the body 41 is located within the third outlet 413. When the mixed gas exiting the mixer 2 passes through the third outlet 413, the third diverter can divide the mixed gas passing through the third outlet 413 into at least two streams. The mixed gas diverted by the third diverter will collide with the mixed gas flowing through the second outlet 412, increasing the flow path of the mixed gas and resulting in a higher uniformity of NH3 (ammonia) distribution before the SCR catalyst support unit 3, thereby improving the NOx (nitrogen oxides) conversion efficiency.
[0063] Specifically, a portion of the body 41 that defines the third vent 413 has a seventh end and an eighth end opposite to the seventh end, with the fifth end 431 connected to the seventh end and the sixth end 432 connected to the eighth end.
[0064] In some embodiments, the second diverter 43 protrudes from the body 41 and has an arc-shaped structure. By making the second diverter 43 protrude from the body 41 and have an arc-shaped structure, the mixed gas can be divided into four streams by the third diverter when passing through the third outlet 413. This increases the collision between the mixed gas flowing out of the third outlet 413 and the mixed gas flowing out of the second outlet 412, resulting in a higher uniformity of NH3 (ammonia) distribution before the SCR catalyst support unit 3 and improving the NOx (nitrogen oxides) conversion efficiency.
[0065] In some embodiments, the width of the second diverter 43 first decreases and then increases along the direction from the fifth end 431 to the sixth end 432.
[0066] In some embodiments, the third outlet 413 is an elliptical orifice. By setting the third outlet 413 to an elliptical orifice, the mixed gas after passing through the third outlet 413 can move along the long axis of the third outlet 413, improving the mixing uniformity and making the distribution of NH3 (ammonia) in front of the SCR catalyst support unit 3 more uniform, thereby improving the conversion efficiency of NOx (nitrogen oxides).
[0067] Specifically, the second vent 412 is located on one side along the long axis of the third vent 413.
[0068] Of course, in other embodiments, the third vent 413 can also be configured as a circular hole or a polygonal hole.
[0069] In some embodiments, the distance between the third vent 413 and the first vent 411 gradually decreases along the direction close to the second vent 412. This arrangement can increase the mutual collision between the mixed gas flowing out of the first vent 411, the mixed gas flowing out of the third vent 413, and the mixed gas flowing out of the second vent 412, thereby improving the mixing uniformity.
[0070] In some embodiments, the body 41 has a first groove 414, and a second vent 412 is uniformly disposed at the bottom of the first groove 414. By providing the first groove, the strength of the body 41 can be increased.
[0071] In some embodiments, the first groove 414 is symmetrically arranged about the center line.
[0072] In some embodiments, the body 41 has a second groove 415, which includes a first sub-groove 4151 and a second sub-groove 4152. The first sub-groove 4151 and the second sub-groove 4152 are respectively disposed at both ends of the first groove 414 along the circumference of the body 41, and both the first sub-groove 4151 and the second sub-groove 4152 extend along the circumference of the body 41. By providing the second groove 415, the strength of the body 41 is improved.
[0073] In some embodiments, the body 41 has a third groove 416, and the third groove 416 and the second groove 415 are respectively disposed at both ends of the first vent 411. The third groove 416 extends circumferentially along the body 41. By providing the third groove 416, the strength of the body 41 is improved.
[0074] In some embodiments, the rectifier plate 4 further includes a flange 44, which is connected to the edge of the body 41, surrounds the body 41, and is inclined to the body 41. By providing the flange 44, it is convenient to connect the rectifier plate 4 to the exhaust pipe 1.
[0075] Specifically, the rectifier plate 4 and the exhaust pipe 1 are connected by welding. By setting the flange 44, the welding of the rectifier plate 4 and the exhaust pipe 1 can be easily realized.
[0076] 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.
[0077] 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.
[0078] 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.
[0079] 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.
[0080] 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.
[0081] 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 rectifier plate (4), characterized in that, include: The body (41) has a first vent (411) and a second vent (412), the area of the first vent (411) is larger than the area of the second vent (412), and the second vent (412) is closer to the edge of the body (41) than the first vent (411). A first diverter (42) has a first end (421) and a second end (422) opposite to the first end (421); The first end (421) and the second end (422) are both connected to a part of the body (41) that defines the first air outlet (411), and the orthographic projection of the first diverter (42) is located in the first air outlet (411) along the axial direction of the body (41).
2. The rectifier plate (4) according to claim 1, characterized in that, The first diverter (42) protrudes from the main body (41) and has an arc-shaped structure.
3. The rectifier plate (4) according to claim 1, characterized in that, The body (41) has a third vent (413), which is spaced apart from the first vent (411). The area of the third vent (413) is larger than the area of the second vent (412), and the second vent (412) is closer to the edge of the body (41) than the third vent (413).
4. The rectifier plate (4) according to claim 3, characterized in that, The body (41) has a center line, and the third vent (413) and the first vent (411) are symmetrically arranged along the center line.
5. The rectifier plate (4) according to claim 3, characterized in that, It also includes a second diverter (43), which has a fifth end (431) and a sixth end (432) opposite to the fifth end (431). The fifth end (431) and the sixth end (432) are both connected to a part of the body (41) that defines the third vent (413). Along the axial direction of the body (41), the orthographic projection of the second diverter (43) is located within the third vent (413).
6. The rectifier plate (4) according to claim 5, characterized in that, The second diverter (43) protrudes from the main body (41) and has an arc-shaped structure.
7. The rectifier plate (4) according to claim 1, characterized in that, The body (41) has a first groove (414), and the second air outlet (412) is evenly disposed at the bottom of the first groove (414).
8. The rectifier plate (4) according to claim 7, characterized in that, The body (41) has a second groove (415), which includes a first sub-groove (4151) and a second sub-groove (4152). The first sub-groove (4151) and the second sub-groove (4152) are respectively disposed at both ends of the first groove (414) along the circumferential direction of the body (41). Both the first sub-groove (4151) and the second sub-groove (4152) extend along the circumferential direction of the body (41).
9. The rectifier plate (4) according to claim 8, characterized in that, The body (41) has a third groove (416), the third groove (416) and the second groove (415) are respectively disposed at both ends of the first air outlet (411), and the third groove (416) extends circumferentially along the body (41).
10. A post-processing system (10), characterized in that, include: The exhaust pipe (1), mixer (2), SCR catalyst carrier unit (3) and rectifier plate (4) according to any one of claims 1-9 are arranged sequentially in the exhaust pipe (1) along the exhaust direction.