SCR flue gas denitration system for marine engine

Abstract

The invention relates to the field of tail gas purification of marine engines, and discloses an SCR flue gas denitration system for a marine engine, the SCR flue gas denitration system comprises a purification frame and a heating mechanism, the left side of the purification frame is fixedly connected with a gas inlet mechanism through a preheating mechanism, and the bottom side of the inner wall of the purification frame is fixedly connected with a purification mechanism; the right side of the preheating mechanism is fixedly connected with a fixing frame, the left side of the fixing frame is fixedly connected with a power mechanism, the right side of the fixing frame is fixedly connected with an air outlet mechanism, the air inlet mechanism comprises an air inlet box, and the bottom side of the air inlet box is fixedly connected to the top side of the preheating mechanism; the right side of the air inlet box is fixedly connected with a protection box, and the inner wall of the protection box is fixedly connected with a driving assembly. By improving the denitration reaction efficiency, nitric oxide can be quickly and stably converted into harmless substances, it is ensured that ship exhaust emission strictly meets the international environmental protection standard, and pollution to the atmospheric environment is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engine exhaust purification, in particular to an SCR flue gas denitration system for marine engines. Background Art

[0002] The SCR (Selective Catalytic Reduction) flue gas denitrification system is an environmentally friendly device used to treat exhaust gases from marine engines. Its core principle is to convert nitrogen oxides (NOx) in the exhaust gas into harmless nitrogen (N2) and water (H2O) through a chemical reaction between a reducing agent (usually urea solution or ammonia water) and the catalyst, thereby reducing the pollution of ship exhaust gases to the environment. The marine engine SCR flue gas denitrification system is a core technical means for ships to meet international environmental regulations. It helps the shipping industry achieve a green transformation by efficiently reducing NOx emissions.

[0003] When the ship is sailing, the SCR flue gas denitrification system is started: the delivery pump pressurizes the urea solution (or ammonia water) in the reducing agent storage tank and sends it to the metering module. After the flow is precisely adjusted, it is atomized and sprayed into the exhaust pipe by the injector, mixing with the 250-450℃ exhaust gas; the mixed gas enters the catalytic reactor, and under the action of the vanadium-titanium based catalyst, the ammonia reacts with the nitrogen oxides to produce nitrogen and water vapor.

[0004] However, some existing SCR flue gas denitrification systems for marine engines are used. However, due to the complex and variable operating conditions of marine engines, frequent load adjustments during navigation due to factors such as wind and waves and load changes can lead to significant variations in exhaust flue gas flow and velocity. When the engine is operating at low load, the flue gas flow is low and the flow velocity is slow. Fixed-angle guide plates cannot effectively guide the flue gas, which can easily cause localized accumulation of flue gas in the flue and insufficient mixing with the reducing agent, resulting in low denitrification efficiency. Therefore, an SCR flue gas denitrification system for marine engines has been proposed. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an SCR flue gas denitrification system for marine engines, which solves the problem in the existing technology that during use of some SCR flue gas denitrification systems for marine engines, the exhaust flue gas flow rate and the reducing agent cannot be fully mixed due to the different sea environment.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an SCR flue gas denitrification system for a marine engine, comprising a purification frame and a heating mechanism, the left side of the purification frame is fixedly connected to an air intake mechanism through a preheating mechanism, the bottom side of the inner wall of the purification frame is fixedly connected to the purification mechanism, the right side of the preheating mechanism is fixedly connected to a fixing frame, the left side of the fixing frame is fixedly connected to a power mechanism, and the right side of the fixing frame is fixedly connected to an exhaust mechanism, the air intake mechanism comprises an air intake box, the bottom side of the air intake box is fixedly connected to the top side of the preheating mechanism, the right side of the air intake box is fixedly connected to a protective box, the inner wall of the protective box is fixedly connected to a driving assembly, a plurality of connecting blocks are provided on the outside of the driving assembly, the left side of the connecting block is fixedly connected to a rotating shaft, the interior of the air intake box is fixedly connected to a connecting barrel through a bucket-shaped frame, the interior of the connecting barrel is fixedly connected to a plurality of conical columns and is spirally spiraled, and the interior of the rotating shaft is fixedly connected to an adjusting plate.

[0007] Preferably, the preheating mechanism includes an air intake frame, the right side of the air intake frame is fixedly connected to the left side of the purification frame, a plurality of heating wires are fixedly connected to the front and rear ends of the air intake frame, the bottom side of the air intake frame is fixedly connected to a collecting rack, the bottom end of the collecting rack is fixedly connected to a water outlet pipe, the right side of the collecting rack is fixedly connected to an air outlet frame, the right side of the air outlet frame is fixedly connected to the left side of the fixed frame, and the top side of the air intake box is fixedly connected to the bottom side of the air intake frame.

[0008] Preferably, the purification mechanism includes a storage barrel, the bottom side of the storage barrel is fixedly connected to the bottom side of the inner wall of the purification frame, the right end of the storage barrel is fixedly connected to the pump body through a pipe, the output end of the pump body is fixedly connected to the discharge pipe, the bottom end of the fixed frame is fixedly connected to the top end of the discharge pipe, the left side of the discharge pipe is fixedly connected to a rectangular tube, the interior of the rectangular tube is fixedly connected to a plurality of fixed tubes, the outside of the fixed tube is fixedly connected to a limiting ring, the outside of the limiting ring is rotatably connected to a rotating head, the top side of the inner wall of the rotating head is fixedly connected to an inverted cone column, and the outside of the inverted cone column is fixedly connected to a plurality of inclined plates.

[0009] Preferably, the power mechanism includes a connecting box, the right side of the connecting box is fixedly connected to the left side of the fixed frame, the interior of the connecting box is fixedly connected to a motor, the driving end of the motor is fixedly connected to a rotating shaft, the outside of the rotating shaft is fixedly connected to a fixed barrel, the outside of the fixed barrel is fixedly connected to a plurality of rotating blades, and the right end of the rotating shaft is fixedly connected to a rubber plate.

[0010] Preferably, the air outlet mechanism includes a trapezoidal box, the left side of the trapezoidal box is fixedly connected to the right side of the fixed frame, the bottom side of the trapezoidal box is fixedly connected to a reaction frame, the interior of the trapezoidal box is fixedly connected to a grid plate, the interior of the reaction frame is fixedly connected to a plurality of reaction plates, the bottom side of the reaction frame is fixedly connected to a collecting bucket, the bottom side of the collecting bucket is fixedly connected to a heating frame, the right end of the heating frame is fixedly connected to a discharge pipe, the right end of the discharge pipe is fixedly connected to the discharge frame, and the left ends of the two reaction plates are fixedly connected to a force-bearing plate.

[0011] Preferably, the heating mechanism includes a heating box, the rear side of which is fixedly connected to the front side of the purification frame, a backflow pipe is fixedly connected to the right side of the heating box, and the rear end of the backflow pipe is fixedly connected to the inside of the heating frame.

[0012] Preferably, the driving assembly includes a cylinder, the bottom side of the cylinder is fixedly connected to the bottom side of the inner wall of the protective box, the driving end of the cylinder is fixedly connected to a sliding frame, and the interior of the sliding frame is slidably connected to multiple transmission columns.

[0013] Preferably, the left side of the transmission column is fixedly connected to the right side of the connecting block, and the outside of the sliding frame is slidably connected to the inner wall of the protective box.

[0014] Preferably, the outside of the rubber plate contacts the adjacent sides of the two force-bearing plates, and the inside of the reaction frame is slidably connected to a collecting frame.

[0015] Preferably, both upper and lower ends of the fixed frame are fixedly connected with inverted flow plates, and the interior of the fixed frame is fixedly connected with two flow mixers.

[0016] The present invention provides an SCR flue gas denitrification system for marine engines. It has the following beneficial effects:

[0017] 1. Through the synergistic effect of the regulating plate, conical column, and flow mixer, this invention achieves precise control of exhaust gas flow and velocity, as well as thorough mixing of the reducing agent and exhaust gas. Compared to traditional denitrification systems, this significantly improves denitrification reaction efficiency, rapidly and stably converting nitrogen oxides into harmless substances. This ensures that ship exhaust emissions strictly comply with international environmental standards and effectively reduces atmospheric pollution.

[0018] 2. Through the provision of components such as a collection rack and frame, this invention achieves automated collection of condensed water and waste residue generated during the reaction process, preventing impurity accumulation from interfering with system operation. Furthermore, the vibration mechanism generated by the rubber plate and the force-bearing plate effectively prevents catalyst clogging, extending the service life of the reaction plate, reducing the frequency and difficulty of manual cleaning and maintenance, and significantly reducing maintenance costs and downtime during vessel operation.

[0019] 3. The present invention constructs a complete gas diversion and temperature control system through components such as backflow plates, rotating blades and heating mechanisms. It not only ensures the uniform flow of exhaust gas in the system and avoids the occurrence of airflow dead corners that affect the reaction effect, but also provides the best thermodynamic conditions for the denitrification reaction through precise temperature regulation, ensuring that the system always maintains stable and efficient operation under the complex and changeable operating conditions of the ship, thereby improving the adaptability of the entire denitrification reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention;

[0021] Figure 2 is a schematic diagram of the air intake box of the present invention;

[0022] Figure 3 Schematic diagram of the preheating mechanism of the present invention;

[0023] Figure 4 A schematic diagram of a connecting barrel of the present invention;

[0024] Figure 5 Schematic diagram of the connecting block of the present invention;

[0025] Figure 6 Schematic diagram of the reaction plate of the present invention;

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0027] Figure 8 Schematic diagram of the present invention.

[0028] Among them, 1. Purification frame; 2. Preheating mechanism; 21. Air intake frame; 22. Heating wire; 23. Collection rack; 24. Water outlet pipe; 25. Air outlet frame; 3. Air intake mechanism; 31. Air intake box; 32. Protective box; 33. Drive assembly; 3301. Cylinder; 3302. Sliding frame; 3303. Transmission column; 34. Rotating shaft; 35. Connecting block; 36. Bucket frame; 37. Connecting barrel; 38. Conical column; 39. Adjustment plate; 4. Purification mechanism; 41. Storage barrel; 42. Pump body; 43. Discharge pipe; 44. Rectangular tube; 45. Fixed tube; 46 , limiting ring; 47, rotating head; 48, inverted cone column; 49, inclined plate; 5, fixed frame; 6, backflow plate; 7, power mechanism; 71, connecting box; 72, motor; 73, rotating shaft; 74, fixed barrel; 75, rotating blade; 76, rubber plate; 8, air outlet mechanism; 81, trapezoidal box; 82, grid plate; 83, reaction plate; 84, collecting frame; 85, collecting bucket; 86, heating frame; 87, discharge pipe; 88, discharge frame; 89, reaction frame; 810, force plate; 9, heating mechanism; 91, heating box; 92, backflow pipe; 10, mixer. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Please see the attached Figure 1 -Attached Figure 3 An embodiment of the present invention provides an SCR flue gas denitrification system for a marine engine, comprising a purification frame 1 and a heating mechanism 9. The purification frame 1 is made of corrosion-resistant alloy steel and provides an operating environment for the subsequent flue gas purification process. The heating mechanism 9 heats and disinfects the exhaust gas. The left side of the purification frame 1 is fixedly connected to an air intake mechanism 3 through a preheating mechanism 2. The air intake mechanism 3 is used to introduce exhaust gas from the hull. The preheating mechanism 2 includes an air intake frame 21. The right side of the air intake frame 21 is fixedly connected to the left side of the purification frame 1 and is fixed by a welding process to provide support for the air intake frame 21. A plurality of heating wires 22 are fixedly connected to the front and rear ends of the air intake frame 21. The heating wires 22 preheat the exhaust gas. A collection rack 23 is fixedly connected to the bottom side of the air intake frame 21. The collection rack 23 is used to collect water generated by the nitrification reaction. The bottom end of the collection rack 23 is fixedly connected to a water outlet pipe 24. The water outlet pipe 24 facilitates the discharge of water inside the collection rack 23. The right side of the collecting rack 23 is fixedly connected to an air outlet frame 25, which is used to guide the movement of the exhaust gas. The right side of the air outlet frame 25 is fixedly connected to the left side of the fixed frame 5 by welding, thereby providing support for the fixed frame 5.

[0031] Please see the attached Figure 3 -Attached Figure 5The air intake mechanism 3 includes an air intake box 31. The top side of the air intake box 31 is fixedly connected to the bottom side of the air intake frame 21 and is fixed by bolts, so that the air intake box 31 can be easily disassembled and assembled, and the exhaust gas can be introduced through the air intake box 31. The bottom side of the air intake box 31 is fixedly connected to the top side of the preheating mechanism 2. The right side of the air intake box 31 is fixedly connected to a protective box 32, which is fixed by a welding process to provide support for the protective box 32. The inner wall of the protective box 32 is fixedly connected to a drive assembly 33. The drive assembly 33 includes a cylinder 3301, and the cylinder 3301 is used to provide a drive source. The bottom side of the cylinder 3301 is fixedly connected to the bottom side of the inner wall of the protective box 32. By fixing the cylinder 3301, the cylinder 3301 can operate stably. The driving end of the cylinder 3301 is fixedly connected to a sliding frame 3302, and the sliding frame 3302 is driven to slide by starting the cylinder 3301. The outside of the sliding frame 3302 is slidably connected to the inner wall of the protective box 32. The protection box 32 restricts the sliding frame 3302, allowing it to slide stably. The inside of the sliding frame 3302 is slidably connected to a plurality of transmission columns 3303. The sliding of the sliding frame 3302 drives the plurality of transmission columns 3303 to slide. The outside of the drive assembly 33 is provided with a plurality of connecting blocks 35. The left side of the transmission column 3303 is fixedly connected to the right side of the connecting block 35. The sliding force is transmitted to the connecting block 35 via the transmission column 3303. The left side of the connecting block 35 is fixedly connected to the rotating shaft 34, which is driven to rotate by the connecting block 35. The inside of the air intake box 31 is fixedly connected to the connecting barrel 37 via the bucket frame 36. The bucket frame 36 is welded to the air intake box 31, and the connecting barrel 37 is then welded to the bucket frame 36. The connecting barrel 37 is fixedly connected to the interior of a plurality of tapered columns 38 in a spiral pattern. These spiral patterns guide the flow of exhaust gas, creating a strong turbulent effect as the flue gas passes through, allowing the flue gas to be thoroughly mixed with the subsequently added reducing agent. An adjustment plate 39 is fixedly connected to the interior of the rotating shaft 34, which is used to adjust the flow of exhaust gas.

[0032] Please see the attached Figure 6 -Attached Figure 8The purification frame 1 has a purification mechanism 4 fixedly connected to the bottom of its inner wall. This mechanism includes a storage barrel 41, which is welded to the bottom of the inner wall of the purification frame 1 to provide support for the barrel. The barrel is used to store a reducing agent, such as urea solution. A pump 42 is fixedly connected to the right end of the barrel via a pipe. The pump 42 and the pipe pump out the reducing agent from the barrel 41. A discharge pipe 43 is fixedly connected to the output end of the pump 42, through which the reducing agent is discharged. The bottom end of the fixed frame 5 is welded to the top of the discharge pipe 43 to provide support for the discharge pipe 43. A rectangular tube 44 is fixedly connected to the left side of the discharge pipe 43. The reducing agent in the discharge pipe 43 is fed into a fixed pipe 45. Multiple fixed pipes 45 are fixedly connected to the interior of the rectangular pipe 44 to discharge the reducing agent from the rectangular pipe 44. The exterior of the fixed tube 45 is fixedly connected to a limit ring 46, secured by welding, providing support for the limit ring 46. A rotating head 47 is rotatably connected to the exterior of the limit ring 46, which, constrained by the limit ring 46, allows the rotating head 47 to rotate around the limit ring 46. An inverted cone column 48 is fixedly connected to the top of the inner wall of the rotating head 47 and secured by welding, providing support for the inverted cone column 48. Multiple inclined plates 49 are fixedly connected to the exterior of the inverted cone column 48 and secured by welding, providing support for the inclined plates 49 and receiving the impact of the reducing agent.

[0033] Please see the attached Figure 3 and attached Figure 6 The right side of the preheating mechanism 2 is fixedly connected to a fixed frame 5. The upper and lower ends of the fixed frame 5 are fixedly connected to a backflow plate 6, which is used to guide the flow of exhaust gas. The left side of the fixed frame 5 is fixedly connected to a power mechanism 7. The power mechanism 7 includes a connecting box 71. The right side of the connecting box 71 is fixedly connected to the left side of the fixed frame 5 and fixed by welding, thereby providing support for the connecting box 71. The interior of the connecting box 71 is fixedly connected to a motor 72, which provides a driving source and fixes the motor 72 so that it can operate stably. The driving end of the motor 72 is fixedly connected to a rotating shaft 73, which is driven by starting the motor 72 to rotate the rotating shaft 73. The exterior of the rotating shaft 73 is fixedly connected to a fixed barrel 74, which transmits the rotational force to the fixed barrel 74 through the rotating shaft 73, causing the fixed barrel 74 to rotate synchronously. The exterior of the fixed barrel 74 is fixedly connected to multiple rotating blades 75, which are driven by the fixed barrel 74 to rotate, thereby accelerating the flow of exhaust gas. The right end of the rotating shaft 73 is fixedly connected to a rubber plate 76 , and the rotating force is transmitted to the rubber plate 76 through the rotating shaft 73 , thereby driving the rubber plate 76 to rotate synchronously.

[0034] See attached Figure 3 and attached Figure 6The right side of the fixed frame 5 is fixedly connected to an exhaust mechanism 8, which is used to guide the exhaust flow. The exhaust mechanism 8 includes a trapezoidal box 81. The left side of the trapezoidal box 81 is fixedly connected to the right side of the fixed frame 5 and secured with bolts, providing support for the trapezoidal box 81. The bottom side of the trapezoidal box 81 is fixedly connected to a reaction frame 89, which is secured by welding to provide support for the reaction frame 89. The interior of the trapezoidal box 81 is fixedly connected to a mesh plate 82, which can perform preliminary filtration of the flue gas to remove impurities. The interior of the reaction frame 89 is fixedly connected to multiple reaction plates 83, and the surface of the reaction plates 83 is coated with a high-efficiency catalyst coating to promote the denitrification reaction. The bottom side of the reaction frame 89 is fixedly connected to a collection hopper 85, which is used to guide the exhaust gas after the reaction. The bottom side of the collection hopper 85 is fixed to the interior of the reaction frame 89, and the collection frame 84 is slidably connected to the interior of the reaction frame 89 to collect particulates generated during the reaction. A heating frame 86 is connected, and a discharge pipe 87 is fixedly connected to the right end of the heating frame 86, through which the gas inside the heating frame 86 is discharged. The right end of the discharge pipe 87 is fixedly connected to a discharge frame 88, which increases the discharge area. The left ends of the two reaction plates 83 are fixedly connected to the force-bearing plates 810, which are fixed by welding to provide support for the force-bearing plates 810. The outer side of the rubber plate 76 contacts the adjacent side of the two force-bearing plates 810, and the two force-bearing plates 810 are intermittently struck by the rotation of the rubber plate 76.

[0035] Please see the attached Figure 1 -Attached Figure 2 The heating mechanism 9 includes a heating box 91, the rear side of which is fixedly connected to the front side of the purification frame 1 and is fixed by a welding process, thereby providing support for the heating box 91. A backflow pipe 92 is fixedly connected to the right side of the heating box 91, and the heating box 91 can transport heat through the backflow pipe 92. This is prior art, so it will not be described in detail here. The rear end of the backflow pipe 92 is fixedly connected to the interior of the heating frame 86, and heat is introduced into the interior of the heating frame 86 through the backflow pipe 92 to heat and disinfect the gas. Two mixers 10 are fixedly connected to the interior of the fixed frame 5. The mixer 10 adopts a static mixer structure. This is prior art, so it will not be described in detail here.

[0036] Working principle: First, the hull exhaust gas is introduced through the air intake box 31. At this time, the cylinder 3301 is activated to drive the sliding frame 3302 to slide, which drives the transmission column 3303 to slide, and then drives the connecting block 35 to rotate. The connecting block 35 drives the rotating shaft 34 to rotate, and then the rotating shaft 34 drives the adjustment plate 39 to rotate, which precisely controls the exhaust gas flow and flow rate. Next, the gas enters the interior of the connecting barrel 37 through the bucket frame 36. The conical column 38 rotating inside the spiral disk creates a strong turbulent effect on the passing flue gas, allowing the flue gas to be fully mixed with the subsequently added reducing agent. The exhaust gas then enters the air intake frame 21, where it is preheated by multiple heating wires 22 to a suitable reaction temperature.

[0037] Then the gas enters the interior of the fixed frame 5 through the air outlet frame 25, and flows upward under the guidance of multiple inverted flow plates 6. At this time, the pump body 42 extracts the urea solution and other reducing agents in the storage barrel 41, and transports them to the rotating head 47 through the discharge pipe 43, the rectangular tube 44 and the fixed tube 45. The rotating head 47 rotates autonomously under the impact of the inverted cone column 48 and the inclined plate 49, so that the rotating head 47 can drive multiple nozzles to rotate, thereby fully mixing and reacting with the exhaust gas, and then the water generated by the reaction will fall into the interior of the collection rack 23 for collection.

[0038] The gas then enters the trapezoidal box 81, where impurities are filtered by the mesh plate 82, and then enters the reaction frame 89. Under the action of the reaction plate 83 coated with a high-efficiency catalyst, the reducing agent reacts with the nitrogen oxides in the exhaust gas to denitrate. The waste residue produced by the reaction is collected by the collection bucket 85 and sent to the collection frame 84 for easy cleaning. The rotating shaft 73 is driven to rotate by the starting motor 72. When the rotating shaft 73 rotates, it drives the rubber plate 76 to intermittently knock on the force plate 810, causing the reaction plate 83 to vibrate to prevent the catalyst from being blocked. At the same time, the reaction plate 83 also drives the fixed barrel 74 to rotate, and then drives the multiple rotating blades 75 to rotate, so that it can speed up the flow rate of the gas.

[0039] Finally, the heating box 91 transmits heat to the heating frame 86 through the backflow pipe 92 to heat and disinfect the treated gas. The qualified gas is discharged overboard through the discharge pipe 87 and the discharge frame 88. During the whole process, the mixer 10 in the fixed frame 5 further enhances the mixing effect to ensure the efficient denitrification reaction.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A SCR flue gas denitrification system for a marine engine, comprising a purification frame (1) and a heating mechanism (9), characterized in that: The left side of the purification frame (1) is fixedly connected to an air intake mechanism (3) via a preheating mechanism (2); the bottom side of the inner wall of the purification frame (1) is fixedly connected to a purification mechanism (4); the right side of the preheating mechanism (2) is fixedly connected to a fixing frame (5); the left side of the fixing frame (5) is fixedly connected to a power mechanism (7); and the right side of the fixing frame (5) is fixedly connected to an air outlet mechanism (8); The air intake mechanism (3) comprises an air intake box (31), the bottom side of the air intake box (31) is fixedly connected to the top side of the preheating mechanism (2), the right side of the air intake box (31) is fixedly connected to a protective box (32), the inner wall of the protective box (32) is fixedly connected to a driving assembly (33), a plurality of connecting blocks (35) are provided on the outside of the driving assembly (33), the left side of the connecting block (35) is fixedly connected to a rotating shaft (34), the interior of the air intake box (31) is fixedly connected to a connecting barrel (37) through a bucket-shaped frame (36), the interior of the connecting barrel (37) is fixedly connected to a plurality of conical columns (38) and is spirally spiraled, and the interior of the rotating shaft (34) is fixedly connected to an adjusting plate (39).

2. The SCR flue gas denitrification system for a marine engine according to claim 1, characterized in that: The preheating mechanism (2) comprises an air intake frame (21), the right side of the air intake frame (21) is fixedly connected to the left side of the purification frame (1), the front and rear ends of the air intake frame (21) are fixedly connected to a plurality of heating wires (22), the bottom side of the air intake frame (21) is fixedly connected to a collection rack (23), the bottom end of the collection rack (23) is fixedly connected to a water outlet pipe (24), the right side of the collection rack (23) is fixedly connected to an air outlet frame (25), the right side of the air outlet frame (25) is fixedly connected to the left side of the fixed frame (5), and the top side of the air intake box (31) is fixedly connected to the bottom side of the air intake frame (21).

3. The SCR flue gas denitrification system for a marine engine according to claim 1, characterized in that: The purification mechanism (4) comprises a storage barrel (41), the bottom side of the storage barrel (41) is fixedly connected to the bottom side of the inner wall of the purification frame (1), the right end of the storage barrel (41) is fixedly connected to a pump body (42) through a pipeline, the output end of the pump body (42) is fixedly connected to a discharge pipe (43), the bottom end of the fixed frame (5) is fixedly connected to the top of the discharge pipe (43), the left side of the discharge pipe (43) is fixedly connected to a rectangular tube (44), the interior of the rectangular tube (44) is fixedly connected to a plurality of fixed tubes (45), the outside of the fixed tube (45) is fixedly connected to a limiting ring (46), the outside of the limiting ring (46) is rotatably connected to a rotating head (47), the top side of the inner wall of the rotating head (47) is fixedly connected to an inverted cone column (48), and the outside of the inverted cone column (48) is fixedly connected to a plurality of inclined plates (49).

4. The SCR flue gas denitrification system for a marine engine according to claim 1, characterized in that: The power mechanism (7) comprises a connection box (71), the right side of the connection box (71) is fixedly connected to the left side of the fixed frame (5), the interior of the connection box (71) is fixedly connected to a motor (72), the driving end of the motor (72) is fixedly connected to a rotating shaft (73), the exterior of the rotating shaft (73) is fixedly connected to a fixed barrel (74), the exterior of the fixed barrel (74) is fixedly connected to a plurality of rotating blades (75), and the right end of the rotating shaft (73) is fixedly connected to a rubber plate (76).

5. The SCR flue gas denitrification system for a marine engine according to claim 4, characterized in that: The air outlet mechanism (8) comprises a trapezoidal box (81), the left side of the trapezoidal box (81) is fixedly connected to the right side of the fixed frame (5), the bottom side of the trapezoidal box (81) is fixedly connected to a reaction frame (89), the interior of the trapezoidal box (81) is fixedly connected to a grid plate (82), the interior of the reaction frame (89) is fixedly connected to a plurality of reaction plates (83), the bottom side of the reaction frame (89) is fixedly connected to a collecting hopper (85), the bottom side of the collecting hopper (85) is fixedly connected to a heating frame (86), the right end of the heating frame (86) is fixedly connected to a discharge pipe (87), the right end of the discharge pipe (87) is fixedly connected to a discharge frame (88), and the left ends of the two reaction plates (83) are fixedly connected to a force-bearing plate (810).

6. The SCR flue gas denitrification system for a marine engine according to claim 5, characterized in that: The heating mechanism (9) comprises a heating box (91), the rear side of the heating box (91) is fixedly connected to the front side of the purification frame (1), the right side of the heating box (91) is fixedly connected to a backflow pipe (92), and the rear end of the backflow pipe (92) is fixedly connected to the inside of the heating frame (86).

7. The SCR flue gas denitrification system for a marine engine according to claim 5, characterized in that: The driving assembly (33) includes a cylinder (3301), the bottom side of the cylinder (3301) is fixedly connected to the bottom side of the inner wall of the protective box (32), the driving end of the cylinder (3301) is fixedly connected to a sliding frame (3302), and the interior of the sliding frame (3302) is slidably connected to multiple transmission columns (3303).

8. The SCR flue gas denitrification system for a marine engine according to claim 7, characterized in that: The left side of the transmission column (3303) is fixedly connected to the right side of the connecting block (35), and the outside of the sliding frame (3302) is slidably connected to the inner wall of the protection box (32).

9. The SCR flue gas denitrification system for a marine engine according to claim 7, characterized in that: The outside of the rubber plate (76) contacts the adjacent sides of the two force-bearing plates (810), and the inside of the reaction frame (89) is slidably connected to the collecting frame (84).

10. The SCR flue gas denitrification system for a marine engine according to claim 1, characterized in that: The upper and lower ends of the fixed frame (5) are fixedly connected to backflow plates (6), and the interior of the fixed frame (5) is fixedly connected to two flow mixers (10).

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