Natural gas cartridge aftertreatment
Patent Information
- Application Number
- CN202522631097.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-12-11
AI Technical Summary
[0004]天然气汽车的排放污染物主要包括一氧化碳（CO）、碳氢化合物(HC)以及氮氧化合物(NOx)，采用三元催化技术能够将CO、HC、NOx催化转化为CO2、N2和H2O，随着六排放标准的实施，对天然气汽车的后处理转化效率及污染物排放水平提出了更高的要求，在天然气发动机系统中，天然气后处理器作为核心零部件，在很大程度上决定了发动机的排放和经济性能，而后处理设备中的催化还原更为重要，其利用喷射的尿素溶液与尾气混合而将氮氧化合物进行混合，以保证尾气排出的整洁性，现有尿素溶液与废气在混合器内进行混合，常用的是喷洒雾状尿素溶液来与其混合，而废气的持续流动会影响两者间的混合效果，影响后续催化还原进程，无法满足使用需求
[0010]与现有技术相比，本实用新型的优点和积极效果在于：
Smart Images
Figure CN224800368U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive exhaust technology equipment, and in particular relates to a natural gas cylinder-type aftertreatment system. Background Technology
[0002] In recent years, my country's rapid economic development has led to a growing demand for oil, resulting in energy shortages and environmental pollution. To alleviate the problems caused by oil shortages and improve the atmospheric environment, developing clean fuels has become a national strategy.
[0003] Natural gas vehicles are clean fuel vehicles that use natural gas as fuel. Compared to gasoline-powered vehicles, they significantly reduce emissions of carbon monoxide, hydrocarbons, and nitrogen oxides, and their exhaust contains no sulfides or lead. Natural gas vehicles have become an important means of reducing pollutant emissions. Natural gas, with its clean, safe, efficient, and abundant reserves, as well as its excellent emission performance, is increasingly being used in the engine field.
[0004] The main pollutants emitted by natural gas vehicles include carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). x The three-way catalytic technology can separate CO, HC, and NO. x Catalytic conversion into CO2, N2, and H2O. With the implementation of the VI emission standards, higher requirements have been placed on the after-treatment conversion efficiency and pollutant emission levels of natural gas vehicles. In natural gas engine systems, the natural gas after-treatment system, as a core component, largely determines the engine's emissions and economic performance. Catalytic reduction in the after-treatment equipment is even more important. It uses sprayed urea solution to mix with the exhaust gas to mix nitrogen oxides, ensuring the cleanliness of the exhaust gas. Currently, urea solution is mixed with exhaust gas in a mixer, usually by spraying atomized urea solution. However, the continuous flow of exhaust gas affects the mixing effect between the two, affecting the subsequent catalytic reduction process and failing to meet the usage requirements. Utility Model Content
[0005] This invention addresses the technical problems existing in the after-treatment process of natural gas vehicles by proposing a natural gas cylinder-type after-treatment system that is reasonably designed, simple in structure, easy to process, and capable of disturbing and statically mixing the exhaust gas and urea solution while ensuring smooth transportation of the exhaust gas and urea solution. This system effectively improves the mixing effect between the two, ensures the smooth progress of the subsequent catalytic reduction process, and effectively meets the usage requirements.
[0006] To achieve the above objectives, the present invention adopts a natural gas cylinder-type aftertreatment system, comprising an aftertreatment body arranged in a U-shape. The aftertreatment body includes an air intake chamber, a GOC component disposed below the air intake chamber, a POC component disposed below the GOC component, a mixer component disposed below the POC component, an SCR aftertreatment component disposed above one side of the mixer component, and an exhaust chamber disposed above the SCR aftertreatment component. The mixer component includes a double-layered housing, a urea inlet port disposed on the outer side of the housing, and a static mixing component disposed inside the housing to improve the mixing effect of exhaust gas and input urea.
[0007] Preferably, the static mixing component includes a lateral turbulence component positioned below the GOC component and having a lateral disturbance function, and a longitudinal turbulence component positioned below the SCR aftertreatment component and having a longitudinal disturbance function. The lateral turbulence component includes a horizontal plate, and two sets of horizontal guide plates are provided at the diagonal corners of the horizontal plate, with the two horizontal guide plates on the same side being centrally symmetrical. The longitudinal turbulence component includes a vertical plate, and vertical guide plates are provided at the diagonal corners of the vertical plate, with the lateral turbulence component and the longitudinal turbulence component being arranged vertically.
[0008] Preferably, a Z-shaped streamlined guide plate is provided on the upper side of the air inlet of the air intake chamber, and a connecting plate is provided on the rear side of the guide plate and connected to the upper inner side of the air intake chamber.
[0009] Preferably, a material distribution plate is provided above the GOC component located in the air intake cavity, and a first material distribution hole is provided on the material distribution plate near the air intake port of the air intake cavity, and a second material distribution hole is provided on the other side of the material distribution plate.
[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a natural gas cylinder-type after-processor that utilizes a built-in mixer assembly. The static mixing component within this assembly can agitate the injected urea solution and the incoming waste gas, thereby extending their residence time and optimizing their travel paths through a shearing mechanism. This significantly improves the mixing effect and ensures the smooth progress of the subsequent catalytic reduction reaction. The device is rationally designed, simple in structure, and easy to manufacture. While ensuring the smooth transport of waste gas and urea solution, it agitates and statically mixes them to maximize their mixing effect, ensuring the smooth progress of the subsequent catalytic reduction process and effectively meeting usage requirements. Attached Figure Description
[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] Figure 1 This is a schematic diagram of a natural gas cylinder-type post-processor. Figure 2 A front view of the structure of a natural gas cylinder-type post-processor; Figure 3 This is a schematic diagram of part of the internal structure of a natural gas cylinder-type post-processor. Figure 4 This is a partial structural explosion diagram of a natural gas cylinder post-processor. Figure 5 A structural diagram illustrating the location of the static hybrid component; Figure 6 This is a schematic diagram of the structure of a static hybrid component; In the above figures, 1 is the intake chamber; 2 is the GOC assembly; 3 is the POC assembly; 4 is the mixer assembly; 41 is the housing; 42 is the urea inlet port; 5 is the SCR aftertreatment assembly; 6 is the exhaust chamber; 7 is the lateral turbulence assembly; 71 is the horizontal plate; 72 is the horizontal guide plate; 8 is the longitudinal turbulence assembly; 81 is the vertical plate; 82 is the vertical guide plate; 9 is the guide plate; 91 is the connecting plate; 10 is the material distribution plate; 101 is the first material distribution hole; and 102 is the second material distribution hole. Detailed Implementation
[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0014] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.
[0015] Examples, such as Figures 1-6As shown, a natural gas cylinder-type aftertreatment system includes an aftertreatment body arranged in a U-shape. The aftertreatment body includes an intake chamber 1 with an L-shaped cross-section. The intake port of the intake chamber is located on one side of the chamber to receive exhaust gas generated by the engine. Below the intake chamber 1 is a GOC (Gas Oxidation Organisation) component 2, which is a commonly used technology device in existing aftertreatment systems. It mainly oxidizes the exhaust gas to convert carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) in the exhaust gas into carbon dioxide, nitrogen, and water vapor. Below the GOC component 2 is a POC (Potential Oxidation Organisation) component 3, which is also a conventional technology in the prior art, used to capture a small amount of particulate matter generated by combustion in the exhaust gas. Below the POC component 3 is a mixer component 4, which is a conventional mixer device in the prior art. Its purpose is to mix the urea solution input from the aftertreatment system with the exhaust gas and then perform a subsequent reduction reaction to achieve thorough purification of the exhaust gas. An SCR (Self-Reducing Catalytic Reduction) aftertreatment component is located above one side of the mixer component 4. 5. An exhaust chamber 6 is provided above the SCR aftertreatment component 5. The SCR aftertreatment component 5 performs a catalytic reduction reaction on the exhaust gas mixed with urea solution, and finally discharges clean exhaust gas outward through the exhaust chamber 6, so that the exhaust gas completes a complete aftertreatment operation, ensuring the cleanliness of the exhaust gas and reducing pollution. Furthermore, the mixer component 4 includes a double-layered housing 41. A urea inlet 42 is provided on the outer side of the housing 41. This inlet is used to place the urea nozzle in the prior art, so that the urea solution is introduced into the mixer in the form of mist, waiting for it to be fully mixed with the exhaust gas to ensure the catalytic reduction process. A static mixing component is provided inside the housing 41 to improve the mixing effect of exhaust gas and input urea. Furthermore, the static mixing component can disturb the sprayed urea solution and the delivered exhaust gas. At the same time, it can relatively prolong the residence time of the two to a certain extent and optimize their travel path by shearing, so as to fully improve the mixing effect between the two and ensure the smooth progress of the subsequent catalytic reduction reaction. In the above process, the established mixer assembly 4, with its built-in static mixing component, can agitate the injected urea solution and the incoming waste gas. Simultaneously, it can relatively prolong the residence time of both and optimize their travel paths through shearing, thereby significantly improving the mixing effect and ensuring the smooth progress of the subsequent catalytic reduction reaction. This device is rationally designed, simple in structure, and easy to manufacture. While ensuring the smooth transport of waste gas and urea solution, it agitates and achieves static mixing to significantly improve the mixing effect, ensuring the smooth progress of the subsequent catalytic reduction process and effectively meeting the usage requirements.
[0016] To improve the functionality of the equipment, especially to enhance the mixing effect between urea solution and waste gas, the static mixing assembly includes a transverse turbulence assembly 7 positioned below the GOC assembly 2 and having a transverse disturbance function, and a longitudinal turbulence assembly 8 positioned below the SCR aftertreatment assembly and having a longitudinal disturbance function. The transverse turbulence assembly 7 includes a horizontal plate 71, with diagonally arranged transverse guide plates 72 at opposite corners on the outer sides of the horizontal plate 71. Two sets of transverse guide plates 72 are provided, and the two transverse guide plates 72 on the same side are centrally symmetrical. The longitudinal turbulence assembly 8 includes a vertical plate 81, with diagonally arranged vertical guide plates 82 at opposite corners on the outer sides of the vertical plate 81. The transverse turbulence assembly 7 and the longitudinal turbulence assembly 8 are arranged vertically. Specifically, the outer periphery of the established transverse guide plates 72 and vertical guide plates 82 is arc-shaped, allowing for relatively smooth transport of the sprayed urea solution and waste gas after mixing. Furthermore, one side of the transverse turbulence assembly 7... On the one hand, it can receive the exhaust gas transported from top to bottom, and on the other hand, it can receive the urea solution sprayed horizontally. When the two media pass through the scissor-shaped horizontal guide plate 72, they can be gathered forward and downward, and also transported to the right rear side of the horizontal turbulence component 7 along with the flow of exhaust gas. At this time, the exhaust gas and urea solution that have completed one mixing flow from the rear side of the horizontal turbulence component 7 to the front side of the vertical turbulence component 8, and then transported upward according to the flow channel of exhaust gas. When passing through the cross-shaped vertical guide plate 82, the mixing effect between the materials is further improved. The above-mentioned horizontal turbulence component 7 and vertical turbulence component 8 work together to extend the residence time of urea solution and exhaust gas in the shell 41, and to disturb their movement process to improve the mixing effect between the two, providing a prerequisite for the subsequent catalytic reduction reaction, thereby optimizing the catalytic conversion efficiency between the media to a certain extent and improving the working process.
[0017] To ensure smooth exhaust gas input, a Z-shaped streamlined guide plate 9 is installed above the air inlet of the air inlet chamber 1. A connecting plate 91 is installed behind the guide plate 9 and is connected to the upper inner side of the air inlet chamber 1. The guide plate 9 is fixedly installed in the air inlet chamber 1 using the connecting plate 91, and the specifications of the guide plate 9 are adapted to the air inlet of the air inlet chamber 1. In this way, the exhaust gas entering through the air inlet chamber 1 is first disturbed by the guide plate 9, reducing the possibility of impurities in the exhaust gas causing damage to the equipment. In addition, the input exhaust gas can also be diverted to the GOC component 2 to ensure the smooth progress of the oxidation reaction.
[0018] To further improve the rationality of the device setup, a material distribution plate 10 is installed above the GOC component 2 located in the air inlet chamber 1. A first material distribution hole 101 is opened on the material distribution plate 10 near the air inlet of the air inlet chamber 1, and a second material distribution hole 102 is opened on the other side of the material distribution plate 10. Specifically, the first material distribution holes 101 are small in diameter and closely arranged near the air inlet of the air inlet chamber 1, while the second material distribution holes have a relatively large diameter and the gap between two adjacent second material distribution holes is larger than the gap between two adjacent first material distribution holes 101. The design of the small and dense first material distribution holes and the large and sparse second material distribution holes ensures both the smoothness of the waste gas introduction and the uniformity of the waste gas introduction, so that it is relatively smooth when input towards the GOC component 2, ensuring the smooth progress of the oxidation catalytic reaction and guaranteeing the working process.
[0019] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.
Claims
1. A natural gas cylinder-type after-processor, comprising an after-processor body arranged in a U-shape, characterized in that, The after-processor body includes an air intake chamber, a GOC component is disposed below the air intake chamber, a POC component is disposed below the GOC component, a mixer component is disposed below the POC component, an SCR after-processor component is disposed above one side of the mixer component, and an exhaust chamber is disposed above the SCR after-processor component. The mixer component includes a housing with a double-layer design, a urea inlet is disposed on the outer side of the housing, and a static mixing component is disposed inside the housing to improve the mixing effect of exhaust gas and input urea.
2. A natural gas cylinder-type post-processor according to claim 1, characterized in that, The static mixing component includes a lateral turbulence component positioned below the GOC component and having a lateral disturbance function, and a longitudinal turbulence component positioned below the SCR after-treatment component and having a longitudinal disturbance function. The lateral turbulence component includes a horizontal plate, and two sets of horizontal guide plates are provided at the diagonal corners of the horizontal plate, with the two horizontal guide plates on the same side being centrally symmetrical. The longitudinal turbulence component includes a vertical plate, and vertical guide plates are provided at the diagonal corners of the vertical plate, with the lateral turbulence component and the longitudinal turbulence component being arranged vertically.
3. A natural gas cylinder-type post-processor according to claim 2, characterized in that, A Z-shaped streamlined guide plate is provided on the upper side of the air inlet of the air inlet chamber, and a connecting plate is provided on the rear side of the guide plate and connected to the upper inner side of the air inlet chamber.
4. A natural gas cylinder-type post-processor according to claim 3, characterized in that, A material distribution plate is provided above the GOC component located in the air intake chamber. A first material distribution hole is provided on the material distribution plate near the air intake port of the air intake chamber, and a second material distribution hole is provided on the other side of the material distribution plate.