Catalytic reduction channel of marine SCR (Selective Catalytic Reduction) system
By introducing filter components and stirring structures into the catalytic reduction channel of the marine SCR system, the problems of exhaust gas blockage and uneven mixing were solved, achieving efficient purification and uniform distribution of exhaust gas and improving the catalytic reduction effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-03-17
AI Technical Summary
Existing marine SCR systems are prone to clogging of the catalytic reduction channel by floating debris in ship exhaust gas, and the exhaust gas flow is unevenly mixed, resulting in poor catalytic reduction performance.
A catalytic reduction channel including a filter assembly and a stirring structure was designed. The filter assembly filters out floating matter, and the stirring structure uses stirring blades and turbulence protrusions to achieve uniform mixing of exhaust gas and ammonia. Combined with the ammonia injection grille, uniform injection is performed to ensure that the exhaust gas is evenly distributed to the catalytic structure.
It effectively avoids clogging by floating debris, achieves uniform mixing and distribution of exhaust gas, improves the efficiency of catalytic reduction reaction, and ensures the purification effect of exhaust gas.
Smart Images
Figure CN224002805U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of marine exhaust gas treatment technology, and in particular to a catalytic reduction channel for a marine SCR system. Background Technology
[0002] With increasingly stringent ship emission regulations, marine selective catalytic reduction (SCR) systems have become the mainstream technology for reducing nitrogen oxides (NOx) emissions from marine diesel engines. Catalytic reduction channels are required in the ship exhaust gas treatment process. However, existing marine SCR systems have at least the following drawbacks: 1. Existing marine SCR systems do not effectively filter the exhaust gas entering the channel, and floating debris in the exhaust gas can easily clog the channel; 2. Existing marine SCR systems do not effectively guide and mix the exhaust gas, resulting in uneven mixing. Therefore, we are introducing a new marine SCR system catalytic reduction channel. Utility Model Content
[0003] The main objective of this invention is to provide a catalytic reduction channel for a marine SCR system, which can effectively solve the problems in the background art.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A catalytic reduction channel for a marine SCR system includes a ventilation frame. A filter assembly is inserted and connected to the left end of the ventilation frame, and an exhaust frame is fixedly connected to the right end of the ventilation frame. Two catalytic structures are inserted and connected to the upper right part of the ventilation frame. Two sets of four horizontal support screws are fixedly connected to the upper right part of the ventilation frame. The two catalytic structures are respectively sleeved with the two sets of four horizontal support screws. A pull ring is fixedly connected to the middle of the upper end of each of the two catalytic structures. Limiting holes are opened at the four corners of the left end of the ventilation frame. Two stirring structures are movably connected to the inner wall of the ventilation frame through a connecting shaft. A guide frame is fixedly connected to the middle of the inner wall of the ventilation frame. Two sets of two horizontal clamping plates are fixedly connected to the right side of the lower inner wall of the ventilation frame, and the two sets of two horizontal clamping plates are respectively sleeved with the two catalytic structures. The guide frame is located between the stirring structure on the right and the catalytic structure on the left.
[0006] The stirring structure includes a support rod with limit grooves at both the upper and lower ends. Several stirring blades are fixedly connected in a ring array on the outer surface of the support rod. Several turbulence protrusions are fixedly connected to the outer surface of the stirring blades. The support rod is movably connected to the inner wall of the ventilation frame through a connecting shaft.
[0007] Preferably, the filter assembly includes a filter frame, a fixing ring is fixedly sleeved on the left side of the outer surface of the filter frame, and four insertion rods are fixedly connected to the four corners of the right end of the fixing ring. A filter structure is inserted through the inner frame wall of the filter frame, and a fixing rod is fixedly connected to the front part of the inner right frame wall and the rear part of the inner right frame wall of the filter frame. The filter frame is inserted through the ventilation frame.
[0008] Preferably, the filter structure includes positioning rods, and two positioning rods are provided. Several filter plates are fixedly connected to the outer surfaces of the two positioning rods at equal intervals in the horizontal direction. The leftmost filter plate has a second pull ring fixedly connected to the front and rear of its left end. The front end of the rear second pull ring is inserted with a pin. The several filter plates in the horizontal direction are inserted and connected to the filter frame.
[0009] Preferably, the two fixing rods are respectively connected to the two positioning rods through each other.
[0010] Preferably, the pin passes through the second pull ring at the rear and is interlocked with the filter frame.
[0011] Preferably, the four insertion rods are respectively inserted and connected to the four limiting holes.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] 1. By setting up a filter assembly, the filter frame is interlocked with the inner wall of the ventilation frame, and the four insert rods are interlocked with the four limit holes respectively. The filter assembly can be positioned by passing screws through the fixing rings and interlocking with the ventilation frame. The multiple filter plates on the filter assembly work together to filter the ship's exhaust gas, preventing floating objects in the exhaust gas from clogging the catalytic reduction channel.
[0014] 2. By setting two stirring structures, each with two support rods, and several stirring blades fixedly connected to the outer surface of each support rod, and turbulence protrusions fixedly connected to the outer surface of each stirring blade, the ship's exhaust gas can be stirred by the two sets of longitudinal stirring blades. An ammonia injection grid is installed between the two stirring structures on the upper frame of the ventilation frame to uniformly inject ammonia. The two stirring structures can make the ammonia and the ship's exhaust gas evenly mixed. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of the catalytic reduction channel of a marine SCR system according to the present invention;
[0016] Figure 2 This is a schematic diagram of the stirring structure connection of the catalytic reduction channel of a marine SCR system according to the present invention;
[0017] Figure 3This is a schematic diagram of the overall structure of the stirring structure of the catalytic reduction channel of a marine SCR system according to the present invention.
[0018] Figure 4 This is a schematic diagram of the overall structure of the filter assembly of the catalytic reduction channel of a marine SCR system according to this utility model;
[0019] Figure 5 This is a schematic diagram of the overall structure of the filter structure of the catalytic reduction channel of a marine SCR system according to this utility model.
[0020] In the diagram: 1. Ventilation frame; 2. Filter assembly; 3. Exhaust frame; 4. Catalytic structure; 5. Support screw; 6. Pull ring No. 1; 7. Stirring structure; 8. Limiting hole; 9. Clamping plate; 10. Guide frame; 71. Support rod; 72. Stirring blade; 73. Turbulence protrusion; 74. Limiting groove; 21. Filter frame; 22. Fixing ring; 23. Insert rod; 24. Filter structure; 25. Fixing rod; 241. Positioning rod; 242. Filter plate; 243. Pull ring No. 2; 244. Pin. Detailed Implementation
[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0024] Please see Figure 1-5 This utility model provides a technical solution:
[0025] A marine SCR system catalytic reduction channel includes a ventilation frame 1. A filter assembly 2 is inserted and connected to the left end of the ventilation frame 1. An exhaust frame 3 is fixedly connected to the right end of the ventilation frame 1. Two catalytic structures 4 are inserted and connected to the upper right part of the ventilation frame 1. Two sets of four horizontal support screws 5 are fixedly connected to the upper right part of the ventilation frame 1. The two catalytic structures 4 are respectively sleeved with the two sets of four horizontal support screws 5. A pull ring 6 is fixedly connected to the middle of the upper end of each of the two catalytic structures 4. Limiting holes 8 are opened at the four corners of the left end of the ventilation frame 1. Two stirring structures 7 are movably connected to the inner frame wall of the ventilation frame 1 through a connecting shaft. A guide frame 10 is fixedly connected to the middle of the inner frame wall of the ventilation frame 1. Two sets of two horizontal clamping plates 9 are fixedly connected to the right side of the lower inner frame wall of the ventilation frame 1, and the two sets of two horizontal clamping plates 9 are respectively sleeved with the two catalytic structures 4. The guide frame 10 is located between the stirring structure 7 on the right and the catalytic structure 4 on the left.
[0026] In this embodiment, the stirring structure 7 includes a support rod 71. Limiting grooves 74 are provided at both the upper and lower ends of the support rod 71. A plurality of stirring blades 72 are fixedly connected in a ring array on the outer surface of the support rod 71. A plurality of turbulence protrusions 73 are fixedly connected to the outer surface of the plurality of stirring blades 72. The support rod 71 is movably connected to the inner frame wall of the ventilation frame 1 through a connecting shaft.
[0027] The above scheme involves setting up two stirring structures 7 to mix ammonia and ship exhaust gas. Several stirring blades 72 are fixedly connected to the outer surface of each of the two support rods 71, and turbulence protrusions 73 are fixedly connected to the outer surface of each stirring blade 72. During the flow of ship exhaust gas within the ventilation frame 1, the airflow drives the stirring blades 72 on the two stirring structures 7 to rotate. The two sets of longitudinal stirring blades 72 can stir the ship exhaust gas. Simultaneously, an ammonia injection grille is installed between the two stirring structures 7 on the upper frame wall of the ventilation frame 1 to uniformly inject ammonia. The two stirring structures 7 enhance the uniform mixing process of ammonia and ship exhaust gas, improving the mixing effect.
[0028] In this embodiment, the filter assembly 2 includes a filter frame 21. A fixing ring 22 is fixedly sleeved on the left side of the outer surface of the filter frame 21. Insert rods 23 are fixedly connected to the four corners of the right end of the fixing ring 22. A filter structure 24 is inserted through the inner frame wall of the filter frame 21. Fixing rods 25 are fixedly connected to the front and rear parts of the inner right frame wall of the filter frame 21. The filter frame 21 is inserted through the ventilation frame 1. The filter structure 24 includes positioning rods 241. Two positioning rods 241 are provided, and the outer surfaces of the two positioning rods 241 are equidistant laterally. Several filter plates 242 are fixedly connected. The leftmost filter plate 242 has a second pull ring 243 fixedly connected to its left front and left rear ends. The second pull ring 243 at the rear end has a pin 244 inserted through its front middle. Several filter plates 242 are inserted through the filter frame 21. Two fixing rods 25 are inserted through the two positioning rods 241 respectively. The pin 244 passes through the second pull ring 243 at the rear end and is inserted through the filter frame 21. Four insert rods 23 are inserted through the four limiting holes 8 respectively.
[0029] The above scheme involves filtering the ship's exhaust gas flowing into the ventilation frame 1 using a filter assembly 2. The filter frame 21 is interlocked with the inner wall of the ventilation frame 1. Four insert rods 23 are interlocked with four limiting holes 8 and connected to the ventilation frame 1 via screws through fixing rings 22. This positions the filter assembly 2. Two positioning rods 241 are sleeved with two fixing rods 25 and connected to the filter frame 21 via pins 244 through pull rings 243, thus positioning the filter structure 24. The connection, installation, and disassembly between the filter assembly 2 and the ventilation frame 1 are convenient, as are the connection, installation, and disassembly between the filter structure 24 and the filter frame 21. This facilitates the cleaning of the multiple filter plates 242 on the filter structure 24. The multiple filter plates 242 work together to filter the ship's exhaust gas, preventing floating matter in the exhaust gas from clogging the catalytic reduction channel.
[0030] It should be noted that this utility model is a catalytic reduction channel for a marine SCR system. During use, the two catalytic structures 4 are first fitted onto the four transverse support screws 5 for initial positioning. Then, the support screws 5 are tightened with nuts to ensure the stability of the catalytic structures 4 under high temperature and vibration conditions, guaranteeing a stable catalytic reaction. The filter frame 21 is then embedded into the inner wall of the ventilation frame 1, and the four inserts 23 are precisely aligned with the four limiting holes 8. Finally, screws are used to connect the filter frame 21 to the ventilation frame 1 through the fixing ring 22, forming a stable channel. The filter base frame and filter structure 24 are connected by positioning rod 241 and fixing rod 25, and pin 244 passes through pull ring 243 and filter frame 21 for fixation. This plug-in connection design allows for cleaning and replacement of filter plate 242 without complicated tools, improving maintenance convenience. The multiple filter plates 242 in the filter assembly 2 form a multi-stage interception barrier. After the ship's exhaust gas enters the ventilation frame 1, it first passes through the filter plate 242. Its pore structure and surface adsorption layer intercept particulate matter, oil and other floating objects in the exhaust gas, preventing these impurities from clogging the catalytic reduction. The ventilation frame 1 reduces the risk of catalyst poisoning and ensures that the exhaust gas enters the subsequent treatment stage in a clean state. When the exhaust gas flows in the ventilation frame 1, the airflow impacts the stirring blades 72, which rotate at high speed using the principle of fluid mechanics. The two sets of longitudinally distributed stirring blades 72 form a three-dimensional stirring effect, breaking the laminar flow state of the exhaust gas and making the airflow turbulent, thus expanding the contact area of gas molecules. The ammonia injection grille adopts a multi-hole differentiated design, and the nozzle diameter is adjusted according to the airflow speed in each area to achieve precise quantitative injection of ammonia. The rotating stirring blades 72 work together with the uniformly injected ammonia to make the ammonia quickly and evenly diffuse into the exhaust gas, providing ideal mixed gas conditions for the catalytic reduction reaction. The guide frame 10 guides the uniformly mixed exhaust gas to the catalytic structure 4. Its internal flow channel is optimized to ensure that the exhaust gas is evenly distributed to the two catalytic structures 4. The catalyst in the catalytic structure 4, at a suitable temperature, promotes the selective catalytic reduction reaction between ammonia and nitrogen oxides in the exhaust gas, converting nitrogen oxides into harmless nitrogen and water. The purified gas is discharged through the subsequent exhaust system, achieving the standard emission of ship exhaust gas.
[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A marine SCR system catalytic reduction passage comprising a ventilation frame (1), characterized in that: The left end of the ventilation frame (1) is connected with a filter assembly (2), the right end of the ventilation frame (1) is fixedly connected with an exhaust frame (3), the upper right part of the ventilation frame (1) is connected with two catalytic structures (4), the upper right part of the ventilation frame (1) is fixedly connected with two groups of four supporting screws (5), the two catalytic structures (4) are sleeved with the two groups of four supporting screws (5), the upper middle part of the two catalytic structures (4) is fixedly connected with a pull ring (6), the left end of the ventilation frame (1) is provided with a limiting hole (8), the inner frame wall of the ventilation frame (1) is movably connected with two stirring structures (7) through connecting shafts, the middle part of the inner frame wall of the ventilation frame (1) is fixedly connected with a flow guide frame (10), the right part of the lower inner frame wall of the ventilation frame (1) is fixedly connected with two groups of two clamping plates (9), and the two groups of two clamping plates (9) are sleeved with the two catalytic structures (4), and the flow guide frame (10) is located between the right stirring structure (7) and the left catalytic structure (4). The stirring structure (7) comprises a supporting rod (71), limiting grooves (74) are formed in the upper and lower ends of the supporting rod (71), a plurality of stirring blades (72) are fixedly connected in an annular array on the outer surface of the supporting rod (71), a plurality of turbulence protrusions (73) are fixedly connected to the outer surface of the stirring blades (72), and the supporting rod (71) is movably connected with the inner frame wall of the ventilation frame (1) through a connecting shaft.
2. A marine SCR system catalytic reduction passage according to claim 1, characterized in that: The filter assembly (2) comprises a filter frame (21), a fixed ring (22) is fixedly sleeved to the left part of the outer surface of the filter frame (21), plug rods (23) are fixedly connected to the right end of the four corners of the fixed ring (22), a filter structure (24) is connected with the inner frame wall of the filter frame (21), and fixed rods (25) are fixedly connected to the front part of the inner right frame wall and the rear part of the inner right frame wall of the filter frame (21). The filter frame (21) is connected with the ventilation frame (1).
3. A marine SCR system catalytic reduction passage according to claim 2, characterized in that: The filter structure (24) comprises a positioning rod (241), two positioning rods (241) are arranged, a plurality of filter plates (242) are fixedly connected to the outer surfaces of the two positioning rods (241) in a transverse and equidistant manner, a second pull ring (243) is fixedly connected to the left end of the front part and the left end of the rear part of the leftmost filter plate (242), a bolt (244) is connected to the front end of the middle part of the rear second pull ring (243), and the transverse plurality of filter plates (242) are connected with the filter frame (21).
4. A marine SCR system catalytic reduction passage according to claim 2, characterized in that: The two fixed rods (25) are connected with the two positioning rods (241).
5. A marine SCR system catalytic reduction passage according to claim 3, characterized in that: The bolt (244) is connected with the filter frame (21) through the rear second pull ring (243).
6. A marine SCR system catalytic reduction passage according to claim 2, characterized in that: The four plug rods (23) are connected with the four limiting holes (8).