Aftertreatment mixing device, aftertreatment system and vehicle

Abstract

An embodiment of the present application provides a post-processing mixing device, a post-processing system and a vehicle. The post-processing mixing device includes an outer tube, an air intake plate and a spiral plate. A first air intake is provided on the air intake plate, and a second air intake is provided on the side wall of the outer tube. The spiral plate is wound into a spiral structure. A third air intake is provided between the third side and the fourth side. The first gas entering from the first air intake and the second gas entering from the second air intake can be mixed at the third air intake. The mixed gas enters the spiral structure from the third air intake, which can extend the flow path of the mixed gas and make the gas mixing more uniform. In addition, the spiral structure can save the length of the outer tube while extending the flow path, reduce the temperature loss of ammonia, improve the utilization rate of urea, and improve the economy of the post-processing system.

Description

Technical Field

[0001] The present application relates to the technical field of exhaust gas after-treatment, and in particular to an after-treatment mixing device, a after-treatment system and a vehicle. Background Art

[0002] With the increasing popularity of vehicles and the continuous upgrading of vehicle exhaust regulations, vehicle exhaust after-treatment systems have also been continuously developed. Natural gas, biogas, and diesel engine sets all emit exhaust containing a large amount of pollutants during operation. Existing engine exhaust after-treatment systems generally use selective catalytic reduction (SCR) to purify nitrogen oxides. During this purification process, a urea mixer is usually installed in front of the SCR to mix ammonia and exhaust gas and then feed it into the SCR for reduction treatment.

[0003] In the prior art, a urea mixer is a straight-through post-treatment mixing device. A urea injection system is usually provided on the side wall of the urea mixer. Urea solution is injected into the urea mixer through the urea injection system. The urea solution undergoes thermal decomposition and hydrolysis to obtain ammonia. The ammonia and exhaust gas are mixed and reacted to achieve the purpose of purifying the exhaust gas.

[0004] However, the gas uniformity and mixing degree in the straight-through after-treatment mixing device are low, resulting in a low detection rate of the sensor used to detect nitrogen oxides at the rear end of the selective catalytic reduction unit. Since the injection rate of urea solution is determined based on the detection rate of the sensor, it will lead to excessive injection of urea, resulting in low urea utilization rate and affecting the economic efficiency of the after-treatment system. Summary of the Invention

[0005] The embodiments of the present application provide a post-treatment mixing device, a post-treatment system, and a vehicle to solve the problems of low gas uniformity, poor mixing, and low urea utilization in a straight-through post-treatment mixing device.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a post-processing mixing device, comprising: an outer tube, an air inlet plate, and a spiral plate;

[0008] The air inlet plate is arranged at the first end of the outer tube, and a first air inlet is provided on the air inlet plate, and the first air inlet is used to introduce a first gas. A second air inlet is provided on the side wall of the outer tube, and the second air inlet is used to introduce a second gas.

[0009] The spiral plate includes a first side, a second side, a third side, and a fourth side, wherein the first side is fixed to the air inlet plate, the second side is fixed to the second end of the outer tube, the second side forms an air outlet, and a portion between the third side and the fourth side is wound into a spiral structure, with a third air inlet being defined between the third side and the fourth side;

[0010] The first air inlet, the second air inlet and the third air inlet are communicated with each other, and the third air inlet is communicated with the air outlet.

[0011] Furthermore, the periphery of the air inlet plate is sealedly connected to the inner wall of the first end of the outer tube, and the first air inlet is located outside the spiral structure.

[0012] Furthermore, the periphery of the air outlet is arranged close to the side wall of the second end of the outer tube.

[0013] Furthermore, the post-processing mixing device further includes a spoiler, and the spoiler is arranged in the outer tube at a position close to the first air inlet.

[0014] Furthermore, the spoiler includes a plate body and a plurality of blades, and the blades are arranged at a preset angle with the plate body.

[0015] Furthermore, the plate body is arranged close to the inner wall of the outer tube, one end of the blade is connected to the plate body, and the other end of the blade is arranged toward the third air inlet.

[0016] Furthermore, the plate body is parallel to the inner wall of the outer tube, and the preset angle is 30-75 degrees.

[0017] Furthermore, an opening is provided on the plate body at a position opposite to the blade.

[0018] In a second aspect, an embodiment of the present application further provides a post-treatment system, the post-treatment system comprising: the above-mentioned post-treatment mixing device and a selective catalytic reducer;

[0019] The gas outlet of the post-treatment mixing device is in communication with the selective catalytic reduction device.

[0020] In a third aspect, an embodiment of the present application further provides a vehicle, which includes the above-mentioned post-processing system.

[0021] In the embodiment of the present application, the above-mentioned post-processing mixing device is provided to mix the first gas entering from the first air inlet and the second gas entering from the second air inlet at the third air inlet. The mixed gas then enters the spiral structure from the third air inlet, thereby extending the flow path of the mixed gas and achieving more uniform gas mixing. In addition, the spiral structure can also save the length of the outer tube while extending the flow path, reducing the temperature loss of ammonia. The improved mixing of the first and second gases can save the amount of urea used to produce ammonia, improve the utilization rate of urea, and enhance the economic efficiency of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic structural diagram showing a post-processing mixing device according to an embodiment of the present application;

[0024] Figure 2 A schematic diagram showing the internal structure of a post-processing mixing device according to an embodiment of the present application;

[0025] Figure 3 A schematic diagram showing the position of a post-processing mixing device in a post-processing system according to an embodiment of the present application;

[0026] Figure 4 A schematic cross-sectional view of the air inlet plate of a post-treatment mixing device according to an embodiment of the present application;

[0027] Figure 5 A schematic cross-sectional view of the gas outlet of a post-processing mixing device according to an embodiment of the present application is shown;

[0028] Figure 6 A side view of a post-processing mixing device according to an embodiment of the present application is shown;

[0029] Figure 7 A schematic diagram showing the position of a spoiler in a post-processing mixing device according to an embodiment of the present application;

[0030] Figure 8 A schematic structural diagram showing a spoiler of a post-processing mixing device according to an embodiment of the present application;

[0031] Figure 9 A schematic structural diagram of a post-processing system according to an embodiment of the present application is shown.

[0032] Description of reference numerals:

[0033] 10: After-treatment mixing device; 101: Outer tube; 102: Air intake plate; 1021: Connecting plate; 103: Spiral plate; 1031: First side; 1032: Second side; 1033: Third side; 1034: Fourth side; 104: First air inlet; 105: Second air inlet; 106: Air outlet; 1061: Flange; 107: Third air inlet; 108: Spoiler; 1081: Plate; 1082: Blade; 1083: Opening; 20: Selective catalytic reduction unit; 30: Urea nozzle. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0036] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0037] An embodiment of the present application provides a post-treatment mixing device that can be used in the post-treatment system of exhaust gas from natural gas engine groups, biogas engine groups, and diesel engine groups, so as to mix the ammonia generated by the urea solution sprayed from the urea injection system with the exhaust gas and send the mixed mixture into a selective catalytic reduction device for reduction treatment.

[0038] Reference Figure 1 , shows a schematic structural diagram of a post-processing mixing device according to an embodiment of the present application, referring to Figure 2 , shows a schematic diagram of the internal structure of a post-processing mixing device according to an embodiment of the present application, referring to Figure 3 , shows a schematic diagram of the position of a post-processing mixing device in a post-processing system according to an embodiment of the present application, such as Figure 1-Figure 3As shown, the post-processing mixing device 10 specifically includes: an outer tube 101, an air intake plate 102 and a spiral plate 103; in actual application, the outer tube 101 is connected to the post-processing system, the first end of the outer tube 101 is arranged close to the air intake end of the post-processing system, and the second end of the outer tube 101 is arranged close to the air outlet end of the post-processing system. Figure 3 The arrows in the figure schematically illustrate the gas flow direction within the after-treatment system 1. Gas enters the inlet port of the after-treatment system 1, undergoes treatment, and is discharged from the outlet port. It should be noted that the gas entering the inlet port may be exhaust gas from the engine block, while the gas discharged from the outlet port is the purified exhaust gas.

[0039] In an embodiment of the present application, the air intake plate 102 is arranged at the first end of the outer tube 101, and a first air inlet 104 is provided on the air intake plate 102. The first air inlet 104 is used to introduce a first gas, wherein the first gas can be the above-mentioned exhaust gas. A second air inlet 105 is provided on the side wall of the outer tube 101. The second air inlet 105 is used to introduce a second gas, wherein the second gas can be ammonia for purifying exhaust gas, etc. Ammonia can be obtained by thermal decomposition of a urea solution sprayed by a urea nozzle provided at the second air inlet 105. The thermal decomposition method here can be achieved by spraying a high-temperature urea solution from the urea nozzle. Figure 2 The dotted line L1 with an arrow in the figure represents the flow direction of the first gas. Figure 2 The dashed line L2 with an arrow in FIG. 1 represents the flow direction of the second gas.

[0040] In the embodiment of the present application, the spiral plate 103 includes a first side 1031, a second side 1032, a third side 1033, and a fourth side 1034. The first side 1031 is fixed to the air inlet plate 102, the second side 1032 is fixed to the second end of the outer tube 101, the second side 1032 forms the air outlet 106, and the portion between the third side 1033 and the fourth side 1034 is wound into a spiral structure, with a third air inlet 107 defined between the third and fourth sides. After mixing, the first and second gases enter the third air inlet 107 and ultimately flow from the air outlet 106 to the selective catalytic reduction device for treatment.

[0041] In practical applications, the spiral plate 103 can be formed by winding a quadrilateral plate, with the first side 1031 and the second side 1032 of the quadrilateral plate facing each other, and the third side 1033 and the fourth side 1034 facing each other. By winding the third side 1033 and the fourth side 1034 to form a spiral structure, the first side 1031 is fixed to the air intake plate 102, and the second side 1032 is fixed to the second end of the outer tube 101, thereby forming the post-processing mixing device 10 described in the embodiment of the present application.

[0042] In the embodiment of the present application, the first air inlet 104, the second air inlet 105, and the third air inlet 107 are connected. The first gas introduced from the first air inlet 104 and the second gas introduced from the second air inlet 105 can be mixed before entering the third air inlet 107. Since the third air inlet 107 is connected to the air outlet 106, the mixed first gas and second gas can enter from the third air inlet 107 and be fully mixed inside the spiral structure before being discharged from the air outlet 106 for processing by downstream devices in the post-treatment system 1.

[0043] In practical applications, the first gas and the second gas can be mixed outside the spiral structure before entering the third air inlet 107. That is, both the inside and outside of the spiral structure can serve as mixing spaces for the first gas and the second gas, thereby fully utilizing the space inside the outer tube 101. While meeting the actual mixing degree requirements, the length of the outer tube 101 can be shortened, making the post-treatment mixing device 10 more compact, thereby reducing the temperature loss of the high-temperature urea solution sprayed from the urea nozzle and improving the efficiency of pyrolysis.

[0044] The post-treatment mixing device provided in the embodiment of the present application is configured such that an air inlet plate 102 is provided at the first end of an outer tube 101, and a first air inlet 104 is provided on the air inlet plate 102, so that a first gas such as exhaust gas can be introduced through the first air inlet 104. A second air inlet 105 is provided on the side wall of the outer tube 101, so that a second gas such as ammonia can be introduced through the second air inlet 105. A spiral plate 103 is provided in the outer tube 101, and a first side of the spiral plate 103 is fixed to the air inlet plate 102, and a second side of the spiral plate 103 is fixed to the second end of the outer tube 101, and the second side forms an air outlet 106. The spiral plate 103 wound into a spiral structure also has a third air inlet 107, and the first air inlet 104 and the second air inlet 105 are connected to the third air inlet 107, and the third air inlet 107 is connected to the air outlet 106. The exhaust gas entering from the first air inlet 104 and the exhaust gas entering from the second air inlet 105 are connected to the third air inlet 107. The incoming ammonia gas can be mixed at the third air inlet 107, and the mixed gas will enter the interior of the spiral structure from the third air inlet 107, thereby extending the flow path of the mixed gas, making the gas mixing more uniform and improving the degree of mixing. In addition, the spiral structure can also save the length of the outer tube 101 while extending the flow path, reduce the temperature loss of ammonia, and reduce the probability of ammonia solidification due to insufficient temperature, thereby saving the use of urea for producing ammonia, improving the utilization rate of urea, and improving the economy of the post-treatment system.

[0045] In this embodiment, the periphery of the air inlet plate 102 is sealed against the inner wall of the first end of the outer tube 101 to ensure that exhaust gas enters only through the first air inlet 104 provided on the air inlet plate 102, preventing exhaust gas from entering from other locations and affecting the uniformity of mixing with ammonia. The first air inlet 104 is located outside the spiral structure, allowing the first gas entering through the first air inlet 104 to first pass outside the spiral structure and mix with the second gas there.

[0046] Optionally, in the embodiment of this application, refer to Figure 4 , shows a cross-sectional schematic diagram of the air intake plate of a post-processing mixing device according to an embodiment of the present application, as shown in Figure 4 As shown, the first air inlet 104 can be positioned on one side of the air inlet plate 102, and the spiral structure formed by the spiral plate 103 can be positioned on the other side of the air inlet plate 102 opposite to the one side, so that the first air inlet 104 is separated from the spiral structure, and the first air inlet 104 is located outside the spiral structure. In actual applications, the relative position of the first air inlet 104 and the spiral structure can also be other positional relationships, as long as the first air inlet 104 is positioned outside the spiral structure. The specific position can also be determined based on the size of the air inlet plate 102, the size of the first air inlet 104, and the size of the spiral structure. Any positional relationship that can position the first air inlet 104 outside the spiral structure falls within the scope of protection of this application. Figure 4 The dotted line L3 in the figure represents the flow direction of the gas. As can be seen from the figure, the flow of the gas is similar to a spiral conch; and the external space of the spiral structure is larger than the internal space, so that the cross-sectional area of ​​the gas flow changes from large to small, thereby increasing the flow velocity of the mixed gas while fully mixing it, thereby improving the operating efficiency of the entire after-treatment system.

[0047] In practical applications, the shape of the first air inlet 104 can be set according to actual conditions, for example, Figure 4 As shown, the first air inlet 104 is fan-shaped, and the size of the first air inlet 104 can be set according to actual needs, for example, determined according to the flow rate and flow of the gas, etc. The embodiment of the application does not limit the specific shape and size of the first air inlet 104.

[0048] In actual applications, the air intake plate 102 can be arranged perpendicular to the central axis of the outer tube 101. In order to facilitate the connection between the air intake plate 102 and the inner wall of the outer tube 101, a connecting plate 1021 can be further provided around the periphery of the air intake plate 102. The connecting surface of the connecting plate 1021 is parallel to the inner wall of the outer tube 101. The air intake plate 102 can be connected to the inner wall of the outer tube 101 via the connecting surface of the connecting plate 1021, thereby increasing the contact area between the air intake plate 102 and the inner wall of the outer tube 101 and improving the strength and sealing of the connection. The connecting surface of the connecting plate 1021 and the inner wall of the outer tube 101 can be connected by gluing or welding. Any connection method that can achieve the connection between the connecting surface of the connecting plate 1021 and the inner wall of the outer tube 101 falls within the scope of protection of this application.

[0049] In the present application, refer to Figure 5 , shows a cross-sectional schematic diagram of the gas outlet of a post-processing mixing device according to an embodiment of the present application, as shown in Figure 5 As shown, the periphery of the gas outlet 106 is positioned near the sidewall of the second end of the outer tube 101, thereby expanding the size of the gas outlet 106 and increasing the contact area between the mixed gas discharged from the gas outlet 106 and the substrate in the selective catalytic reduction device downstream of the post-treatment mixing device, thereby improving the efficiency of exhaust gas treatment. In actual application, to enhance the airtightness of the connection, the gas outlet 106 is provided with a flange 1061, which is fixedly connected to the sidewall of the second end of the outer tube 101. The fixed connection can be made by gluing or welding, for example.

[0050] Reference Figure 6 , shows a side view of a post-processing mixing device according to an embodiment of the present application. As can be seen from Figure 6, in the post-processing mixing device 10 provided in the embodiment of the present application, the size of the spiral structure at the first side 1031 is smaller than the size at the gas outlet 106, so that the mixed gas entering from the third gas inlet 107 can be further diffused and mixed in the spiral structure, further improving the uniformity of the mixing of the first gas and the second gas.

[0051] In the embodiment of the present application, the post-processing mixing device 10 further includes a spoiler 108. The spoiler 108 can disrupt the direction of gas flow, increase the gas flow distance, and thus improve the degree of gas mixing. The spoiler 108 can also disperse the urea in the mixed gas and evenly distribute it throughout the mixed gas, preventing urea from agglomerating and crystallizing, thereby improving the utilization rate of urea. The spoiler 108 is disposed within the outer tube 101 near the first air inlet 104, so that it can act as a flow disruptor when the first gas and the second gas begin to mix, further increasing the degree of mixing of the first gas and the second gas.

[0052] In practical applications, the spoiler 108 may have various structural forms, and any structural form that can disrupt the fluid falls within the scope of protection of this application.

[0053] Optionally, refer to Figure 7 , shows a schematic diagram of the position of the spoiler of a post-processing mixing device according to an embodiment of the present application, with reference to Figure 8 , shows a schematic structural diagram of a spoiler described in a post-processing mixing device according to an embodiment of the present application, such as Figure 7 and Figure 8 As shown, in the embodiment of the present application, the spoiler 108 includes a plate body 1081 and a plurality of blades 1082, wherein the blades 1082 are arranged at a preset angle with the plate body 1081. The blades 1082 mainly play the role of disturbing the gas flow.

[0054] In actual applications, in order to increase the effect of flow disturbance and avoid the plate 1081 interfering with the flow of gas, the plate 1081 is arranged close to the inner wall of the outer tube 101 so that the gas flows along the surface of the plate 1081 to avoid interfering with the flow rate of the gas. One end of the blade 1082 is connected to the plate 1081, and the other end of the blade 1082 is arranged toward the third air inlet 107. That is to say, while the blade 1082 plays a role in flow disturbance, the overall trend of the blade 1082 remains consistent with the direction of the airflow, avoiding the blade 1082 from having too much influence on the flow rate of the airflow.

[0055] In the embodiment of the present application, the plate 1081 is parallel to the inner wall of the outer tube 101 so as to minimize the influence of the plate 1081 on the gas flow rate.

[0056] In actual applications, there are many ways to fix the plate body 1081, for example, welding or gluing it to the outer tube 101. In the embodiment of the present application, one end of the plate body 1081 is inserted on the air intake plate 102, and the other end of the plate body 1081 is inserted on the flange 1061. In order to prevent the plate body 1081 from falling off due to shaking, after the plate body 1081 is inserted, it needs to be welded to the air intake plate 102 and the flange 1061, such as spot welding, to improve the stability of the connection and prevent the plate body 1081 from falling off.

[0057] In actual applications, the preset angle between the blades 1082 and the plate body 1081 can be set according to actual needs. In order to minimize the impact of the spoiler 108 on the gas flow rate and reduce the back pressure of the spoiler 108, in the embodiment of the present application, the preset angle can be 30-75 degrees. This is to avoid excessive back pressure at the spoiler 108 while achieving a good spoiling effect.

[0058] In an embodiment of the present application, in order to further reduce the influence of the plate body 1081 on the gas flow rate, an opening 1083 is provided on the plate body 1081 at a position opposite to the blade 1082. The opening 1083 not only facilitates the passage of airflow, but also increases the gas flow distance, improves the degree of gas mixing, and also plays a role in disturbing the flow.

[0059] In practical applications, the shape and size of the opening 1083 can be set according to actual needs. For example, the shape of the opening 1083 is the same as that of the blade 1082, both are rectangular, and the size of the opening 1083 can be consistent with the size of the blade 1082. The embodiment of the present application does not specifically limit the shape and size of the opening 1083.

[0060] In practical applications, the size of the spiral structure can be determined based on the bottom spiral formula and the flare circle radius ratio. Specifically, the bottom spiral formula is R=r0+k×θ, where r0 is the initial radius, k is the curvature, and θ is the initial angle. The flare circle radius ratio is α=D1\D0, where D0 is the radius of the circle enclosed by the first side 1031, and D1 is the radius of the circle at the outlet 106. The radius ratio should be between 0 and 1 (i.e., 0<α<1). The two parameters of the initial radius ratio α and the curvature k control the direction of the spiral structure. By determining the above two parameters, the direction of the entire spiral structure can be determined. In practical applications, by changing the above two parameters, the direction of the spiral structure can be improved, thereby improving the uniformity of the gas.

[0061] The post-processing mixing device provided in the embodiments of the present application has the following advantages:

[0062] In an embodiment of the present application, the post-processing mixing device includes an outer tube, an air inlet plate, and a spiral plate. The air inlet plate is disposed at a first end of the outer tube and is provided with a first air inlet port, which can be used to introduce a first gas, such as exhaust gas. A second air inlet port is provided on a side wall of the outer tube, which can be used to introduce a second gas, such as ammonia. The spiral plate includes a first side, a second side, a third side, and a fourth side. The first side is fixed to the air inlet plate, the second side is fixed to the second end of the outer tube, and the second side forms an air outlet. The portion between the third and fourth sides is wound into a spiral structure. A third air inlet is provided between the third and fourth sides. The first and second air inlets are connected to the third air inlet, and the third air inlet is connected to the air outlet. The first gas entering from the first air inlet and the second gas entering from the second air inlet can be mixed at the third air inlet. The mixed gas enters the spiral structure from the third air inlet, which can extend the flow path of the mixed gas and make the gas mixing more uniform. In addition, the spiral structure can also save the length of the outer tube and reduce the temperature loss of ammonia while extending the flow path. The post-treatment mixing device provided in the embodiment of the present application can improve the mixing uniformity of the first gas and the second gas, and the mixing degree is high. This can save the amount of urea used to generate ammonia, improve the utilization rate of urea, and improve the economic efficiency of the post-treatment system.

[0063] Reference Figure 9 , shows a schematic structural diagram of a post-treatment system according to an embodiment of the present application. As shown in FIG9 , an embodiment of the present application further provides a post-treatment system, which includes: the above-mentioned post-treatment mixing device 10 and a selective catalytic reducer 20, wherein the gas outlet of the post-treatment mixing device 10 is connected to the selective catalytic reducer 20. The exhaust gas and ammonia mixed by the post-treatment mixing device 10 enter the selective catalytic reducer 20 through the gas outlet, and can undergo a reduction reaction under the action of the catalyst in the selective catalytic reducer 20 to remove nitrogen oxides in the exhaust gas, thereby achieving the purpose of purifying the exhaust gas. Among them, the specific structural form and working principle of the post-treatment mixing device 10 have been described in detail in the above-mentioned embodiment, and the embodiment of the present application does not limit this.

[0064] In the embodiment of the present application, the post-treatment system further includes: a urea nozzle 30, which is arranged at the second air inlet 105 on the outer tube 101 of the post-treatment mixing device 10. The urea injection system can inject urea solution into the post-treatment mixing device 10 through the urea nozzle 30 to generate ammonia to mix with the exhaust gas.

[0065] The post-processing system provided by the embodiment of the present application has the following advantages:

[0066] In an embodiment of the present application, the post-treatment system is provided with the above-mentioned post-treatment mixing device, so that the first gas entering from the first air inlet and the second gas entering from the second air inlet can be mixed at the third air inlet. The mixed gas enters the spiral structure from the third air inlet, which can extend the flow path of the mixed gas, making the gas mixing more uniform. In addition, the spiral structure can also save the length of the outer tube while extending the flow path, reducing the temperature loss of ammonia. The post-treatment system provided by the embodiment of the present application has a high degree of mixing of the first gas and the second gas, thereby saving the use of urea solution, improving the utilization rate of urea, and improving the economic efficiency of the entire post-treatment system.

[0067] The present application also provides a vehicle including the above-mentioned post-processing system. The specific structure and working principle of the post-processing system have been described in detail in the above-mentioned embodiment, and the present application does not limit this.

[0068] The vehicle provided by the embodiments of the present application has the following advantages:

[0069] The vehicle of the embodiment of the present application is provided with the above-mentioned after-treatment system. The after-treatment system is provided with the above-mentioned after-treatment mixing device. The first gas entering from the first air inlet and the second gas entering from the second air inlet can be mixed at the third air inlet. The mixed gas enters the spiral structure from the third air inlet, which can extend the flow path of the mixed gas, making the gas mixing more uniform. In addition, the spiral structure can also save the length of the outer tube while extending the flow path, reducing the temperature loss of ammonia. The after-treatment system provided by the embodiment of the present application has a high degree of mixing of the first gas and the second gas, thereby saving the use of urea solution, improving the utilization rate of urea, and improving the economy of the entire vehicle.

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0071] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0072] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0073] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

[0074] The above is a detailed introduction to a post-processing mixing device, a post-processing system and a vehicle provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A post-processing system, characterized in that: The post-treatment system includes: a post-treatment mixing device and a selective catalytic reduction device; The gas outlet of the post-treatment mixing device is in communication with the selective catalytic reduction device; The post-processing mixing device comprises: an outer tube, an air inlet plate and a spiral plate; the spiral plate is formed by winding a quadrilateral plate; The air inlet plate is arranged at the first end of the outer tube, and a first air inlet is provided on the air inlet plate, and the first air inlet is used to introduce a first gas. A second air inlet is provided on the side wall of the outer tube, and the second air inlet is used to introduce a second gas. The spiral plate includes a first side, a second side, a third side, and a fourth side. The first side is fixed to the air inlet plate, the second side is fixed to the second end of the outer tube, and the second side forms an air outlet. The air outlet is provided with a flange fixedly connected to the side wall of the second end of the outer tube. The portion between the third and fourth sides is wound into a spiral structure, and a third air inlet is defined between the third and fourth sides. The third air inlet is used to introduce the mixed first and second gases. The post-treatment system further includes a urea nozzle, which is provided at the second air inlet and is used to generate the second gas. The first air inlet, the second air inlet and the third air inlet are in communication with each other, and the third air inlet is in communication with the air outlet; The first gas and the second gas are mixed outside the spiral structure before entering the third gas inlet.

2. The post-processing system according to claim 1, characterized in that: The periphery of the air inlet plate is sealedly connected to the inner wall of the first end of the outer tube, and the first air inlet is located outside the spiral structure.

3. The post-processing system according to claim 1, characterized in that: The periphery of the air outlet is arranged close to the side wall of the second end of the outer tube.

4. The post-processing system according to claim 1, characterized in that: The post-treatment mixing device further includes a spoiler, which is arranged in the outer tube at a position close to the first air inlet.

5. The post-processing system according to claim 4, characterized in that: The spoiler includes a plate body and a plurality of blades, and the blades are arranged at a preset angle with the plate body.

6. The post-processing system according to claim 5, characterized in that: The plate body is arranged close to the inner wall of the outer tube, one end of the blade is connected to the plate body, and the other end of the blade is arranged toward the third air inlet.

7. The post-processing system according to claim 5, characterized in that: The plate body is parallel to the inner wall of the outer tube, and the preset angle is 30-75 degrees.

8. The post-processing system according to claim 5, characterized in that: An opening is provided on the plate body at a position opposite to the blades.

9. A vehicle, characterized in that: The vehicle includes the aftertreatment system of claim 1 .

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