Exhaust gas treatment devices and vehicles

Abstract

This application discloses an exhaust gas treatment device and a vehicle, relating to the technical field of exhaust gas treatment. An exhaust gas treatment device includes: an exhaust gas treatment component and an airflow control component; the exhaust gas treatment component includes a mixing chamber, the side wall of which is provided with an airflow inlet; the airflow control component includes a guide pipe and a guide nozzle, one end of the guide pipe is used to receive airflow, and the other end of the guide pipe is connected to the guide nozzle, the guide nozzle being disposed at the airflow inlet. A vehicle includes the above-described exhaust gas treatment device. This application can solve problems such as urea crystallization in SCR systems.

Description

Technical Field

[0001] This application belongs to the technical field of exhaust gas treatment, specifically relating to an exhaust gas treatment device and a vehicle. Background Technology

[0002] In diesel vehicle selective catalytic reduction (SCR) systems, urea crystallization is particularly prominent under low-speed, low-flow conditions. Frequent idling or low-speed driving in urban environments results in low exhaust flow rates, making it difficult for the urea solution to be fully atomized and uniformly mixed with the exhaust gas. Undecomposed urea crystallizes upon cooling, and the accumulation of these crystals can cause nozzle clogging, reduced system efficiency, and even catalytic converter failure, severely impacting emission control performance. Furthermore, existing injection strategies and pipeline layouts are ill-suited to the low-flow-rate hydrodynamic characteristics, with localized eddies leading to droplet retention, further exacerbating the urea crystallization problem in SCR systems. Breakthroughs are urgently needed through technological iterations such as injection parameter optimization and exhaust pipe structure improvements. Utility Model Content

[0003] The purpose of this application is to provide an exhaust gas treatment device and vehicle that can solve problems such as urea crystallization in SCR systems.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide an exhaust gas treatment device, including: an exhaust gas treatment component and an airflow control component; The exhaust gas treatment assembly has a mixing chamber, and the side wall of the mixing chamber is provided with an airflow inlet; The airflow control component includes a flow guide pipe and a flow guide nozzle. One end of the flow guide pipe is used to receive airflow, and the other end of the flow guide pipe is connected to the flow guide nozzle, which is located at the airflow inlet.

[0005] In some more specific embodiments, the mixing chamber is provided with a mixing component and a flow guide; The mixing component is used to mix the urea aqueous solution and the exhaust gas in the mixing chamber; The guide element is disposed corresponding to the airflow inlet and is used to guide the airflow flowing in through the airflow inlet to the mixing component.

[0006] In some more specific embodiments, the guide member is a guide plate, one end of which is connected to the inner wall of the mixing cavity, and the other end of which extends obliquely toward the centerline of the mixing cavity.

[0007] In some more specific embodiments, the downstream end of the guide vane extends obliquely toward the centerline of the mixing chamber along the flow direction of the exhaust gas within the mixing chamber.

[0008] In some more specific embodiments, the surface of the guide plate facing the mixing cavity is a spatial spiral surface.

[0009] In some more specific embodiments, the mixing component includes a flow equalization plate, a swirling tube, and a swirling plate; Along the flow direction of the exhaust gas in the mixing chamber, the flow equalization plate and the swirl plate are respectively located at both ends of the Haloxylon ammodendron swirl tube; The flow guide is provided correspondingly to the vortex tube.

[0010] In some more specific embodiments, the exhaust gas treatment device further includes an air filter having a first outlet and a second outlet; The first air outlet is connected to the exhaust gas treatment component, and the second air outlet is connected to one end of the guide pipe.

[0011] In some more specific embodiments, the airflow control component further includes an air compressor, which is disposed in the flow guide pipe and located between the air filter and the flow guide nozzle.

[0012] In some more specific embodiments, the end of the mixing chamber is provided with an air intake cone structure, and the inner cavity of the air intake cone structure is connected to the inner cavity of the mixing chamber; The side wall of the air intake cone structure is provided with a mounting base, the mounting base is provided with an injection channel, and the injection channel is connected to the inner cavity of the air intake cone structure; The intake cone structure has an exhaust gas inlet at one end opposite to the mixing chamber.

[0013] In some more specific embodiments, a particulate capture and purification component is provided downstream of the mixing chamber to capture particles in the exhaust gas.

[0014] In some more specific embodiments, an exhaust pipe is connected downstream of the particulate collection and purification component, through which the treated exhaust gas is further transmitted downstream.

[0015] In some more specific embodiments, the exhaust gas treatment assembly further includes an oxidizing catalyst and a particulate filter, which are connected in sequence along the flow direction of the exhaust gas.

[0016] Secondly, the embodiments of this application also provide an SCR system, the disclosed SCR system including: a turbocharger, an intercooler radiator, an engine assembly, a muffler assembly, and the above-mentioned exhaust gas treatment device; The exhaust gas from the engine components is cooled by the intercooler to reduce its temperature; the cooled exhaust gas then enters the turbocharger, which pressurizes the exhaust gas to increase its flow rate. The SCR system also includes a control module, which can regulate the exhaust gas treatment process.

[0017] Thirdly, embodiments of this application also provide a vehicle including the aforementioned exhaust gas treatment device.

[0018] In some more specific embodiments, the vehicle is a diesel vehicle.

[0019] In this embodiment, the exhaust gas can be treated through a mixing chamber to eliminate harmful substances and reduce air pollution. During exhaust gas treatment, a guide pipe delivers airflow to a guide nozzle, which then sprays the airflow into the mixing chamber along the airflow inlet. This creates a strong vortex within the mixing chamber, enhancing the disturbance of the exhaust gas and optimizing the mixing of the exhaust gas with the urea solution injected into the mixing chamber, thus improving the uniformity of the mixture. Based on the above configuration, this embodiment utilizes active airflow control instead of the traditional passive mixing method, maintaining high turbulence intensity even at low exhaust gas flow rates, overcoming the dependence of existing mixers on flow thresholds. Based on a dynamic vortex generation mechanism, this embodiment helps reduce the probability of urea solution stagnation on the inner wall of the mixing chamber, further reducing the risk of crystallization clogging the catalyst pores, while also considering emission performance and system reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the exhaust gas treatment component disclosed in the embodiments of this application; Figure 2 This is a schematic diagram of the internal structure of the exhaust gas treatment component disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the exhaust gas treatment assembly disclosed in the embodiments of this application at the mixing component and the flow guide; Figure 4 This is a schematic diagram of the hybrid component, flow guide, and other structures disclosed in the embodiments of this application; Figure 5 This is a schematic diagram of the exhaust gas treatment device disclosed in the embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: 10-Exhaust gas treatment assembly; 11-Selective oxidation-reduction unit; 111-Mixing chamber; 1111-Airflow inlet; 112-Mixing component; 1121-Flow equalization plate; 1122-Swirl tube; 1123-Swirl plate; 113-Flow guide; 114-Inlet cone structure; 1141-Mounting base; 11411-Injection channel; 1142-Exhaust gas inlet; 1143-Inlet flange; 115-Particulate matter collection and purification component; 116-Exhaust pipe; 1161-Exhaust flange; 12-Oxidation catalyst; 13-Particulate matter collector; 20 - Airflow control assembly; 21 - Flow guide pipe; 22 - Flow guide nozzle; 23 - Air compressor; 30 - Air filter; 31 - First air outlet; 32 - Second air outlet; 40 - Turbocharger; 50 - Intercooler radiator; 60 - Engine assembly; 70 - Muffler assembly. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0025] refer to Figures 1 to 5 This application discloses an exhaust gas treatment device for treating exhaust gas generated by a vehicle engine to reduce the emission of harmful substances in the exhaust gas and alleviate environmental pollution. The disclosed exhaust gas treatment device includes an exhaust gas treatment component 10 and an airflow control component 20.

[0026] The exhaust gas treatment assembly 10 is used to treat exhaust gas to reduce the content of harmful substances in the exhaust gas and reduce environmental pollution. The exhaust gas treatment assembly 10 includes a mixing chamber 111, which receives the exhaust gas and mixes it with a urea aqueous solution within the mixing chamber 111 to undergo a chemical reaction. This reaction converts some nitrogen oxides in the exhaust gas into nitrogen and water, preventing the direct emission of nitrogen oxides and thus preventing environmental pollution. It should be noted that the reaction principle of the urea aqueous solution and the exhaust gas within the mixing chamber 111 is based on existing technology and will not be elaborated upon here.

[0027] Considering that the urea solution and the exhaust gas may not mix evenly when the exhaust gas treatment device is operating at low speed and low flow, which may easily lead to crystallization problems.

[0028] To address the crystallization problem, the side wall of the mixing chamber 111 in this embodiment is provided with an airflow inlet 1111. The outlet of the airflow control component 20 can be connected to the airflow inlet 1111, allowing the airflow control component 20 to introduce airflow into the mixing chamber 111 through the airflow inlet 1111. This airflow accelerates the mixing of the urea aqueous solution and the exhaust gas, thereby improving the uniformity of the mixing of the urea aqueous solution and the exhaust gas, which helps to alleviate the crystallization problem.

[0029] Among them, such as Figure 5 As shown, the airflow control component 20 includes a guide pipe 21 and a guide nozzle 22. One end of the guide pipe 21 is used to receive airflow, and the other end of the guide pipe 21 is connected to the guide nozzle 22, which is located at the airflow inlet 1111. Based on this, the guide pipe 21 can transmit the received airflow to the guide nozzle 22, and the guide nozzle 22 can spray airflow into the mixing chamber 111 through the airflow inlet 1111. This allows the airflow to further mix the urea aqueous solution and the exhaust gas in the mixing chamber 111, thereby improving the mixing uniformity of the urea aqueous solution and the exhaust gas and alleviating the crystallization problem.

[0030] Optionally, the airflow can be a high-pressure, high-speed airflow to further improve the mixing uniformity of the urea solution and the exhaust gas. For example, the airflow can come from the exhaust gas emitted by the engine. Of course, a separate air supply device can also be provided to supply the airflow, wherein the air supply device can be an air tank, an air pump, etc.

[0031] In this embodiment, the exhaust gas can be treated by the mixing chamber 111 to eliminate harmful substances in the exhaust gas and reduce air pollution. During the exhaust gas treatment process, the guide pipe 21 can deliver the airflow to the guide nozzle 22, and spray it into the mixing chamber 111 along the airflow inlet 1111 via the guide nozzle 22. Thus, by injecting airflow into the mixing chamber 111, a strong vortex can be formed in the mixing chamber 111 to enhance the disturbance of the exhaust gas. This can optimize the mixing of the exhaust gas and the urea aqueous solution injected into the mixing chamber 111, which is beneficial to improve the mixing uniformity of the exhaust gas and the urea aqueous solution.

[0032] Based on the above settings, this embodiment utilizes active airflow control to replace the traditional passive mixing method, thereby maintaining high turbulence intensity under low exhaust gas flow rates and overcoming the dependence of existing mixers on flow thresholds. Based on a dynamic eddy current generation mechanism, this embodiment can help reduce the probability of urea aqueous solution stagnation on the inner wall of the mixing chamber 111, further reducing the risk of crystallization clogging the catalyst voids, while also considering emission performance and system reliability.

[0033] When the exhaust gas is at a low speed and low flow rate, the airflow control component 20 can inject high-speed swirling air into the mixing chamber 111 to increase the turbulence and disturbance of the exhaust gas in the mixing chamber 111, thereby enhancing the uniformity of mixing between the urea aqueous solution and the exhaust gas.

[0034] refer to Figures 2 to 5 In some embodiments, the mixing chamber 111 may be provided with a mixing component 112 and a flow guide 113. The mixing component 112 is used to initially mix the urea aqueous solution and the exhaust gas in the mixing chamber 111 to improve the mixing uniformity of the urea aqueous solution and the exhaust gas; the flow guide 113 is provided corresponding to the airflow inlet 1111 and is used to guide the airflow flowing in through the airflow inlet 1111 to the mixing component 112.

[0035] It should be noted that during the flow of the urea solution and exhaust gas within the mixing chamber 111, they come into contact with and collide with the mixing component 112, which facilitates the mixing of the urea solution and exhaust gas. Simultaneously, the airflow accelerates the movement of the urea solution and exhaust gas, further promoting their mixing and improving uniformity.

[0036] By setting the guide component 113, the airflow entering through the airflow inlet 1111 can be guided and dispersed, causing the airflow to form a swirling flow. This further mixes the urea solution and exhaust gas, enhances the eddy and disturbance effects, achieves secondary mixing of the urea solution and exhaust gas, and improves the mixing uniformity of the urea solution and exhaust gas. At the same time, by setting the guide component 113, the diffusion space of the airflow in the mixing chamber 111 can also be increased, expanding the contact area between the airflow and the urea solution and exhaust gas, which is beneficial to improving the mixing uniformity of the urea solution and exhaust gas.

[0037] Optionally, the airflow inlet 1111 can be located on the side wall of the mixing chamber 111 and away from the center line of the mixing chamber 111. That is, the center line of the airflow inlet 1111 intersects and is spaced apart from the center line of the mixing chamber 111. In this way, the airflow flowing into the mixing chamber 111 through the airflow inlet 1111 can flow along the tangential direction of the mixing chamber 111, thereby forming a vortex in the mixing chamber 111, improving the catalytic effect on the urea aqueous solution and the exhaust gas, and further improving the mixing uniformity of the urea aqueous solution and the exhaust gas.

[0038] In addition, the mixing component 112 can be disposed inside the mixing chamber 111 near the center line of the mixing chamber 111, so that a space is formed between the mixing component 112 and the inner wall of the mixing chamber 111, and the guide component 113 is disposed in this space.

[0039] In some more specific embodiments, the flow guide 113 can be a flow deflector, such as... Figure 3 and Figure 4 As shown, at least a portion of the baffle plate can be disposed opposite to the airflow inlet 1111 to receive the airflow flowing in through the airflow inlet 1111, so that the airflow is dispersed on the surface of the baffle plate to expand the diffusion space of the airflow in the mixing chamber 111.

[0040] To prevent the deflector from completely obstructing the airflow, the deflector can be tilted. In this way, it can both block the airflow to a certain extent and guide the airflow to a certain extent.

[0041] One end of the guide plate is connected to the inner wall of the mixing chamber 111 to ensure the stability of the guide plate and prevent it from shaking or falling off when subjected to airflow impact; the other end of the guide plate extends obliquely toward the centerline of the mixing chamber 111.

[0042] Based on the above configuration, under the guidance of the baffle plate, the airflow flowing into the mixing chamber 111 through the airflow inlet 1111 can flow toward the mixing component 112, thereby allowing more airflow to flow directly to the mixing component 112, which can improve the utilization efficiency of the airflow.

[0043] In some embodiments, along the flow direction of the exhaust gas in the mixing chamber 111, the downstream end of the guide vane may extend obliquely toward the centerline of the mixing chamber 111, such that the distance between the upstream end of the guide vane and the centerline of the mixing chamber 111 is greater than the distance between the downstream end of the guide vane and the centerline of the mixing chamber 111.

[0044] Based on the above settings, when the airflow impacts the deflector, the deflector can restrict the airflow in the direction of exhaust gas flow, thereby effectively preventing the airflow from colliding with the exhaust gas upstream and obstructing the exhaust gas flow.

[0045] Considering that the other end of the guide plate extends inclinedly towards the center line of the mixing chamber 111, and at the same time, the downstream end of the guide plate extends inclinedly towards the center line of the mixing chamber 111, the guide plate is arranged in a three-dimensional space within the mixing chamber 111, thereby guiding the airflow in multiple directions, improving the catalytic effect of the airflow on the urea aqueous solution and exhaust gas, and reducing the obstruction effect on the exhaust gas.

[0046] In some more specific embodiments, the surface of the guide plate facing the mixing cavity 111 can be a spatial spiral surface, so as to guide the airflow through the spatial spiral surface.

[0047] refer to Figure 2 and Figure 3 In some embodiments, the mixing component 112 may include a flow equalization plate 1121, a swirl tube 1122, and a swirl plate 1123. The flow equalization plate 1121 and the swirl plate 1123 are respectively disposed at both ends of the swirl tube 1122 along the flow direction of the exhaust gas in the mixing chamber 111.

[0048] Optionally, the flow equalization plate 1121 may have multiple through holes, through which the exhaust gas and urea solution can flow into the vortex tube 1122. In this way, the multiple through holes can achieve the effect of equalizing the flow of the exhaust gas and urea solution, making the distribution of the exhaust gas and urea solution in the mixing chamber 111 more uniform.

[0049] In addition, the middle part of the flow equalization plate 1121 may be provided with a first flow guide hole, and multiple through holes are distributed in the outer peripheral area of ​​the first flow guide hole.

[0050] The swirl tube 1122 may include a tube body and multiple swirl shields disposed on the side wall of the tube body, the multiple swirl shields being distributed circumferentially along the tube body. The inner cavity of the tube body may communicate with the first guide hole of the flow equalization plate 1121; the side wall of the tube body is provided with multiple openings distributed circumferentially, the multiple swirl shields are respectively covered at the multiple openings, and an airflow space is formed between each swirl shield and the side wall of the tube body. The airflow space is connected to the opening, and the multiple swirl shields are arranged in the same direction along the circumference of the tube body.

[0051] Based on the above configuration, the urea solution and exhaust gas inside the pipe can flow into multiple vortex shrouds through multiple openings, causing the urea solution and exhaust gas to form vortices, thereby making the urea solution and exhaust gas mix more thoroughly and improving the mixing uniformity.

[0052] The swirl plate 1123 may be provided with multiple swirl holes, which are arranged circumferentially along the swirl plate 1123. In this way, the urea aqueous solution and the exhaust gas can flow downstream through the multiple swirl holes, and the swirl effect of the urea aqueous solution and the exhaust gas can be further enhanced under the action of the multiple swirl holes, thereby further improving the mixing uniformity of the urea aqueous solution and the exhaust gas.

[0053] In addition, a second guide hole may be provided in the middle region of the swirl plate 1123, and the second guide hole is connected to the inner cavity of the tube body.

[0054] Based on the above configuration, a portion of the urea solution and exhaust gas can flow into the pipe body through the first guide hole, while the other portion flows to the outer periphery of the pipe body through multiple through holes. A portion of the urea solution and exhaust gas inside the pipe body can continue to flow downstream through the second guide hole, while the other portion flows through multiple openings and forms a swirling flow on the outer periphery of the pipe body under the action of multiple swirling shrouds. This swirling flow mixes with another portion of the urea solution and exhaust gas on the outer periphery of the pipe body and flows together through multiple swirling holes. Under the action of multiple swirling holes, the swirling effect can be further enhanced, thereby further improving the mixing uniformity of the urea solution and exhaust gas.

[0055] In this embodiment, the guide element 113 is correspondingly arranged with the swirl tube 1122, so that the airflow guided by the guide element 113 can be fully mixed with the urea aqueous solution and exhaust gas that form a swirl through the swirl tube 1122, thereby accelerating the flow of the urea aqueous solution and exhaust gas and improving the mixing uniformity of the urea aqueous solution and exhaust gas.

[0056] refer to Figure 5 In some embodiments, the exhaust gas treatment device may further include an air filter 30 having a first outlet 31 and a second outlet 32. The first outlet 31 is connected to the exhaust gas treatment assembly 10 so that a portion of the exhaust gas filtered by the air filter 30 flows into the exhaust gas treatment assembly 10 for treatment via the first outlet 31. The second outlet 32 ​​is connected to one end of a guide pipe 21 so that another portion of the exhaust gas filtered by the air filter 30 flows into the guide pipe 21 via the second outlet 32, and is then transported to a guide nozzle 22 via the guide pipe 21, and finally sprayed into the mixing chamber 111 by the guide nozzle 22.

[0057] refer to Figure 5In some embodiments, the airflow control component 20 may further include an air compressor 23, which is an air compressor located in the guide pipe 21 and between the air filter 30 and the guide nozzle 22. Based on this, the air compressor 23 can pressurize the exhaust gas in the guide pipe 21, increasing its pressure and flow rate to form high-pressure, high-speed exhaust gas. Thus, when the high-pressure, high-speed exhaust gas is injected into the mixing chamber 111 via the guide nozzle 22, it can generate a greater impact on the urea aqueous solution and the exhaust gas, further enhancing the swirling effect of the urea aqueous solution and the exhaust gas, thereby making the urea aqueous solution and the exhaust gas mix more thoroughly and improving the mixing uniformity.

[0058] refer to Figure 1 and Figure 2 In some embodiments, the end of the mixing chamber 111 may be provided with an intake cone structure 114, the inner cavity of which is connected to the inner cavity of the mixing chamber 111, and the end of the intake cone structure 114 facing away from the mixing chamber 111 is provided with an exhaust gas inlet 1142. Based on this, the exhaust gas can flow into the inner cavity of the intake cone structure 114 through the exhaust gas inlet 1142, and then into the mixing chamber 111 through the inner cavity of the intake cone structure 114, so that the exhaust gas can be mixed with the urea aqueous solution in the mixing chamber 111.

[0059] Optionally, along the flow direction of the exhaust gas within the intake cone structure 114, the cross-sectional area of ​​the inner cavity of the intake cone structure 114 gradually increases. Thus, as the exhaust gas flows along the inner cavity of the intake cone structure 114, the flow area of ​​the exhaust gas increases, which is beneficial to improving the mixing of the subsequent exhaust gas and urea aqueous solution, thereby improving the mixing uniformity.

[0060] In addition, the intake cone structure 114 can be curved to facilitate the assembly of components and prevent assembly interference between components.

[0061] For example, the end of the intake cone structure 114 facing away from the mixing chamber 111 may be provided with an intake flange 1143, which can be connected to the particle trap 13 described below to ensure the reliability and sealing of the connection.

[0062] In some embodiments, the sidewall of the intake cone structure 114 may be provided with a mounting base 1141, which has an injection channel 11411 that communicates with the inner cavity of the intake cone structure 114. Based on this, a urea aqueous solution can be received through the injection channel 11411, allowing the urea aqueous solution to flow into the inner cavity of the intake cone structure 114 via the injection channel 11411 and continue downstream to the mixing chamber 111 to mix with the exhaust gas.

[0063] Optionally, the urea nozzle can be disposed on the mounting base 1141, and the urea nozzle is disposed corresponding to the injection channel 11411. In this way, the urea aqueous solution can be injected into the injection channel 11411 through the urea nozzle, so that the urea aqueous solution can flow through the injection channel 11411 and the inner cavity of the intake cone to the mixing chamber 111 and mix with the exhaust gas.

[0064] For example, the intake cone structure 114 and the mounting base 1141 can be an integral structure. Alternatively, the mounting base 1141 can be fixedly installed on the side wall of the intake cone structure 114.

[0065] Optionally, the axis of the injection channel 11411 can be set at an acute angle to the flow direction of the exhaust gas within the intake cone structure 114, so that the urea aqueous solution can follow the flow direction of the exhaust gas without obstructing the flow of the exhaust gas, ensuring the smooth flow of the exhaust gas, and carrying the urea aqueous solution to the mixing chamber 111 for thorough mixing through the exhaust gas.

[0066] In some embodiments, a particulate matter collection and purification component 115 may be provided downstream of the mixing chamber 111 to collect particles in the exhaust gas, thereby reducing particulate matter in the exhaust gas and lowering environmental pollution. It should be noted that the specific structure and working principle of the particulate matter collection and purification component 115 can be found in existing technologies and will not be described in detail here.

[0067] A gas outlet pipe 116 can be connected downstream of the particulate capture and purification unit 115. The treated exhaust gas can be further transmitted downstream through the gas outlet pipe 116 so that the exhaust gas can be discharged.

[0068] Furthermore, the particulate collection and purification component 115 and the exhaust pipe 116 can be connected by a rear conical structure to improve the strength of the connection and alleviate the stress concentration problem.

[0069] Optionally, the end of the vent pipe 116 may be provided with a vent flange 1161, which can be connected to the silencer assembly 70 described below, thereby ensuring the reliability of the connection and improving the sealing of the connection.

[0070] In addition, the outer wall of the mixing cavity 111 may be provided with a hook, which can be used for hoisting to prevent components such as the mixing cavity 111 from falling off.

[0071] It should be noted that the mixing chamber 111, mixing component 112, flow guide 113, intake cone structure 114, particulate collection and purification component 115, and exhaust pipe 116 can together constitute a selective oxidation-reduction device 11. The selective oxidation-reduction device 11 performs an oxidation-reduction reaction on the exhaust gas, thereby reducing nitrogen oxides in the exhaust gas and reducing environmental pollution.

[0072] In addition, the exhaust gas treatment assembly 10 may also include an oxidation catalyst 12 and a particulate filter 13. Along the flow direction of the exhaust gas, the oxidation catalyst 12, particulate filter 13, and selective oxidation-reduction (SOR) 11 are connected in sequence. Thus, the exhaust gas is first treated by the oxidation catalyst 12; then, particulate matter is captured by the particulate filter 13 to reduce the particulate matter content in the exhaust gas; and finally, the exhaust gas is transferred to the SOR 11 for further treatment to reduce harmful substances in the exhaust gas and reduce environmental pollution. The particulate filter 13 can be connected to the mixing chamber 111 of the SOR 11.

[0073] Based on the above-mentioned exhaust gas treatment device, this application also discloses an SCR system, referencing... Figure 5 The disclosed SCR system includes: a turbocharger 40, an intercooler radiator 50, an engine assembly 60, a muffler assembly 70, and the aforementioned exhaust gas treatment device.

[0074] The exhaust gas discharged from the engine assembly 60 can be cooled by the intercooler radiator 50 to reduce the exhaust gas temperature; the cooled exhaust gas can enter the turbocharger 40, where the turbocharger 40 pressurizes the exhaust gas to increase the exhaust gas flow rate.

[0075] After being treated by the air filter 30, the exhaust gas flows into the oxidation catalyst 12 for catalytic treatment, and then flows into the particulate filter 13 for particulate collection. Finally, the catalytically treated exhaust gas with fewer particles is passed into the selective oxidation-reduction reactor 11 for further treatment.

[0076] In addition, the SCR system may also include a control module, which can regulate the exhaust gas treatment process. It should be noted that the specific structure and control principle of the control module can be found in existing technologies and will not be elaborated upon here.

[0077] Based on the above-described exhaust gas treatment device, this application also discloses a vehicle, which includes the above-described exhaust gas treatment device.

[0078] The vehicle can be a diesel vehicle, and the exhaust gas treatment device can treat the exhaust gas produced by the diesel vehicle, thereby reducing harmful emissions and reducing environmental pollution.

[0079] In this embodiment, during vehicle operation, when the exhaust gas temperature is greater than or equal to the first temperature threshold T1 and the urea aqueous solution is in the injection state, a comprehensive judgment is made by combining the monitoring signals from the exhaust gas mass flow sensor and the nitrogen oxide sensor. If the exhaust gas mass flow rate is less than the first mass flow rate threshold M1, it is defined as a low-speed, low-flow mode. Under this condition, the airflow control component 20 in the exhaust gas treatment device can intervene. That is, a portion of the exhaust gas diverted by the air filter 30 is pressurized by the air compressor 23 to form high-pressure exhaust gas, which is then transported to the guide nozzle 22 through the guide pipe 21 and injected at high speed into the mixing chamber 111 through the guide nozzle 22. This increases the vortex intensity and disturbance intensity of the urea aqueous solution and the exhaust gas, thereby improving the mixing uniformity of the urea aqueous solution and the exhaust gas and effectively alleviating the problem of urea crystallization.

[0080] In summary, the embodiments of this application utilize high-pressure swirling active injection technology with 30-way air filter splitting. By breaking the static distribution of urea droplets through dynamic vortex disturbance, it solves the problems of poor mixing uniformity at low flow rates and the flow dependence of traditional mixers. It integrates the swirling structure with the optimized layout of the mixing chamber 111, and uses the high-speed airflow shearing effect to reduce the retention of urea aqueous solution on the inner wall of the mixing chamber 111, simultaneously suppressing the risk of crystallization blockage, and improving the SCR catalytic efficiency and operational reliability under low flow conditions.

[0081] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A tail gas treatment device, characterized in that, include: Exhaust gas treatment assembly (10) and airflow control assembly (20); The exhaust gas treatment assembly (10) has a mixing chamber (111) and an airflow inlet (1111) is provided on the side wall of the mixing chamber (111). The airflow control component (20) includes a flow guide pipe (21) and a flow guide nozzle (22). One end of the flow guide pipe (21) is used to receive airflow, and the other end of the flow guide pipe (21) is connected to the flow guide nozzle (22). The flow guide nozzle (22) is located at the airflow inlet (1111).

2. The exhaust gas treatment device according to claim 1, characterized in that, The mixing chamber (111) is provided with a mixing component (112) and a flow guide (113). The mixing component (112) is used to mix the urea aqueous solution and the exhaust gas in the mixing chamber (111); The flow guide (113) is provided corresponding to the airflow inlet (1111) and is used to guide the airflow flowing in through the airflow inlet (1111) to the mixing component (112).

3. The exhaust gas treatment device according to claim 2, characterized in that, The guide member (113) is a guide plate. One end of the guide plate is connected to the inner wall of the mixing cavity (111), and the other end of the guide plate extends obliquely toward the center line of the mixing cavity (111).

4. The exhaust gas treatment device according to claim 3, characterized in that, Along the flow direction of the exhaust gas in the mixing chamber (111), the downstream end of the guide plate extends obliquely toward the centerline of the mixing chamber (111).

5. The exhaust gas treatment device according to claim 4, characterized in that, The surface of the guide plate facing the mixing cavity (111) is a spatial spiral surface.

6. The exhaust gas treatment device according to any one of claims 2 to 5, characterized in that, The mixing component (112) includes a flow equalization plate (1121), a swirl tube (1122), and a swirl plate (1123). Along the flow direction of the exhaust gas in the mixing chamber (111), the flow equalization plate (1121) and the swirl plate (1123) are respectively disposed at both ends of the swirl tube (1122); The flow guide (113) is provided correspondingly to the vortex tube (1122).

7. The exhaust gas treatment device according to any one of claims 1 to 5, characterized in that, The exhaust gas treatment device further includes an air filter (30) having a first outlet (31) and a second outlet (32). The first air outlet (31) is connected to the exhaust gas treatment component (10), and the second air outlet (32) is connected to one end of the guide pipe (21).

8. The exhaust gas treatment device according to claim 7, characterized in that, The airflow control assembly (20) also includes an air compressor (23), which is located in the flow guide pipe (21) and between the air filter (30) and the flow guide nozzle (22).

9. The exhaust gas treatment device according to claim 1, characterized in that, The mixing chamber (111) is provided with an air intake cone structure (114) at its end, and the inner cavity of the air intake cone structure (114) is connected to the inner cavity of the mixing chamber (111). The side wall of the intake cone structure (114) is provided with a mounting base (1141), the mounting base (1141) is provided with an injection channel (11411), and the injection channel (11411) is connected to the inner cavity of the intake cone structure (114). The intake cone structure (114) has an exhaust gas inlet (1142) at one end opposite to the mixing chamber (111).

10. A vehicle, characterized in that, Includes the exhaust gas treatment device according to any one of claims 1 to 9.

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