Catalytic device for ship exhaust gas denitration treatment

Abstract

This invention discloses a catalytic device for denitrification treatment of ship exhaust gas, belonging to the field of exhaust gas treatment technology. The catalytic device for denitrification treatment of ship exhaust gas includes a denitrification container and an inlet pipe and an outlet pipe respectively disposed at both ends of the denitrification container. It also includes: an ammonia injection assembly disposed at the top of the denitrification container; a denitrification section disposed inside the denitrification container, the denitrification section including a rotating frame and a plurality of catalyst blocks evenly arranged circumferentially on the rotating frame; and a flow guide section disposed inside the denitrification container and between the ammonia injection assembly and the denitrification section. This invention achieves dynamic and uniform mixing of ammonia and flue gas through the combined rotation and oscillation motion of the ammonia injection ring and the reciprocating oscillation of the flow guide plate. By having the catalyst blocks work alternately driven by the rotating frame, combined with mechanical cleaning by a flexible scraper and backflushing of flue gas from the leeward side, the catalyst achieves self-cleaning and balanced load, extending catalyst life, reducing back pressure, reducing ammonia escape, and improving denitrification efficiency and operational stability.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and in particular to a catalytic device for denitrification treatment of ship exhaust gas. Background Technology

[0002] Ships are primarily powered by diesel fuel. Diesel engines produce a large amount of exhaust gas during combustion, containing significant amounts of harmful gases such as sulfur and nitrogen oxides. Direct emission of these gases into the air causes air pollution, necessitating treatment of diesel engine exhaust. In the field of marine exhaust denitrification, selective catalytic reduction (SCR) technology has become mainstream due to its efficient and reliable nitrogen oxide emission reduction capabilities.

[0003] Existing marine SCR denitrification systems still have many shortcomings in practical applications. First, traditional fixed ammonia grids (AIGs) have a single spray angle, making it difficult to adapt to the complex flow field distribution within the flue gas duct. This leads to uneven mixing of ammonia and flue gas, and localized imbalances in the ammonia-nitrogen ratio, which not only reduces denitrification efficiency but also easily causes ammonia escape and ABS blockage in downstream equipment. Second, the catalyst layer is usually installed in a fixed manner. After long-term operation, its windward end face and honeycomb channels are easily blocked by fly ash, unburned carbon particles, and ABS deposits in the flue gas, resulting in decreased catalyst activity and increased exhaust back pressure, seriously affecting the stability and economy of the system. In addition, existing soot removal methods are mostly fixed sonic or steam blowing, which have cleaning dead zones, making it impossible to effectively clean the catalyst. Furthermore, catalyst module replacement is difficult and maintenance costs are high. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a catalytic device for denitrification treatment of ship exhaust gas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A catalytic denitrification device for ship exhaust gas includes a denitrification container and an inlet pipe and an outlet pipe respectively disposed at both ends of the denitrification container, and further includes:

[0007] The ammonia injection unit, located at the top of the denitrification container, is used to spray urea aqueous solution onto the flue gas entering the denitrification container.

[0008] The denitrification section is installed inside the denitrification container and is used to remove nitrogen oxides from the flue gas. The denitrification section includes a rotating frame and several catalyst blocks evenly arranged on the rotating frame in a circular pattern. Adjacent catalyst blocks are separated by partitions of the rotating frame.

[0009] A flow guide section is disposed inside the denitrification container and between the ammonia injection assembly and the denitrification section, and is used to guide the flue gas.

[0010] And a drive unit, located on the outside of the denitrification container, is used to drive the rotating frame to rotate inside the denitrification container to adjust the denitrification working position of each catalyst sector block.

[0011] Preferably, the denitrification container includes an upper cylinder, a guide cylinder, a middle cylinder, a denitrification cylinder, and a lower cylinder arranged sequentially from top to bottom. The upper cylinder is fixedly connected to the air inlet pipe, and the lower cylinder is fixedly connected to the air outlet pipe.

[0012] Preferably, the ammonia injection assembly includes a rotating pipe rotatably disposed between the air inlet pipe and the upper cylinder, a connecting block rotatably disposed at the bottom of the rotating pipe via a pin, an ammonia injection ring connected within the connecting block, ammonia injection nozzles evenly arranged circumferentially on the ammonia injection ring, an ammonia injection hose disposed within the rotating pipe and connected to the ammonia injection ring, and a liquid inlet pipe connected to the ammonia injection hose via a rotating joint.

[0013] Preferably, the outside of the rotating tube is provided with an angle adjustment assembly for driving the ammonia injection ring to swing. The angle adjustment assembly includes a movable ring slidably connected to the outside of the rotating tube, a rotating ring circumferentially rotatably disposed outside the movable ring, a first connecting rod hinged to the rotating ring, and a second connecting rod with one end hinged to the first connecting rod and the other end fixedly connected to the connecting block.

[0014] A first guide rod that is slidably connected to the rotating ring is fixed on the outside of the rotating tube.

[0015] The inner wall of the intake pipe is fixed with a second guide rod that is slidably connected to the moving ring.

[0016] Preferably, a guide block is fixedly provided on the inner wall of the moving ring, and a spiral guide groove that cooperates with the guide block is provided on the outer side of the rotating tube;

[0017] The outer side of the rotating tube is circumferentially connected to two positioning rings that are fixedly connected to the second guide rod, and a corrugated pipe is provided between the positioning rings and the moving ring.

[0018] Preferably, the denitrification section is disposed inside the denitrification cylinder, the rotating frame is rotatably connected to the inner wall of the denitrification cylinder, and a rotating seal is provided between the inner wall of the denitrification cylinder and the outer wall of the rotating frame and the partition plate;

[0019] The inner wall of the denitrification cylinder is provided with a groove, and a flexible scraper is provided in the groove via a connecting rod to move against the outer wall of the catalyst fan block. The bottom of the gas outlet pipe is provided with a receiving box for collecting impurities.

[0020] Preferably, the drive unit includes a housing fixed to the outside of the denitrification cylinder, a rotating rod rotatably disposed inside the housing, a drive motor disposed on the housing and used to drive the rotating rod to rotate, a main bevel gear disposed on the rotating rod, a rotating rod rotatably disposed inside the denitrification cylinder and connected to the rotating frame, and a secondary bevel gear disposed on the rotating rod and meshing with the main bevel gear.

[0021] The drive unit also includes synchronous pulleys respectively mounted on the rotating rod and the rotating tube, and a synchronous belt mounted between the two synchronous pulleys.

[0022] Preferably, the flow guiding part includes a plurality of rotating shafts rotatably disposed inside the flow guiding cylinder and flow guiding plates disposed on the rotating shafts, and a flow guiding channel is provided between two adjacent flow guiding plates.

[0023] Preferably, the drive unit further includes an eccentric member disposed on the rotating rod, a connecting rod circumferentially disposed on the eccentric member, a movable plate hinged to the connecting rod and sliding on the outside of the guide tube, and an elastic telescopic rod with one end hinged to the movable plate and the other end fixedly connected to the rotating shaft.

[0024] Preferably, the intake pipe is provided with a grille, the grille including a fixed ring fixed in the intake pipe, connecting strips equidistantly distributed in the fixed ring, and air guide plates disposed between two adjacent connecting strips, and a reinforcing strip is connected to one end of several air guide plates on the same horizontal plane away from the connecting strip.

[0025] Compared with the prior art, the present invention provides a catalytic device for denitrification treatment of ship exhaust gas, which has the following beneficial effects:

[0026] 1. This invention utilizes the combined circumferential rotation and axial oscillation of the ammonia spraying ring to create a dynamic three-dimensional spray trajectory for the atomized urea solution within the flue gas duct cross-section, resulting in a wide coverage area and fewer spray dead zones. Simultaneously, the guide plate, driven by the drive unit, oscillates back and forth, guiding the flue gas through the guide tube in a winding path, extending the contact and mixing path and time between ammonia and flue gas. The synergistic effect of these two components improves the mixing uniformity of ammonia and flue gas, effectively avoiding local ammonia-nitrogen ratio imbalance, thereby increasing denitrification efficiency while reducing ammonia escape and minimizing downstream blockage risks.

[0027] 2. This invention employs a rotating frame to drive multiple catalyst blocks to work in turn, ensuring that each block evenly distributes the load of fly ash and ABS adhesive in the flue gas. This avoids the problem of the first layer of traditional fixed catalysts always bearing the maximum ash-clogging pressure and failing prematurely. At the same time, flexible scrapers mechanically scrape the windward end of the catalyst blocks as they move away from the working position. Combined with the reverse flushing of the pores by the purified flue gas when the blocks turn to the leeward side, a dual ash-cleaning mechanism of mechanical scraping and airflow backflushing is achieved. This promptly removes accumulated ash, effectively prevents the honeycomb pores from clogging, maintains stable exhaust back pressure, and ensures the economical operation of the diesel engine.

[0028] 3. This invention improves the overall working environment of the catalyst by having each catalyst sector block take turns in the windward working position, thus balancing the load and avoiding factors that accelerate aging such as local overheating, dust accumulation and caking, and ABS poisoning. The chemical activity and mechanical strength of individual catalyst sectors block can be maintained for a long time, and the overall service life is extended compared with traditional stationary catalysts, reducing the labor and spare parts costs of ship operation.

[0029] 4. This invention, by setting a grid in the air inlet pipe, uses a guide plate and connecting strip to cut and guide the turbulent flue gas, making the airflow into the reaction zone uniform and stable, providing a good flow field basis for subsequent ammonia injection mixing and catalytic reaction. At the same time, a rotary seal is provided between the inner wall of the denitrification cylinder and the rotating frame to effectively prevent flue gas from leaking from the rotation gap; a receiving box is provided at the bottom of the air outlet pipe to collect the scraped and back-blown impurities, avoiding the impurities from being thrown or accumulated in the container again. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0032] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0033] Figure 4 This is a cross-sectional structural diagram of the present invention;

[0034] Figure 5 for Figure 4 Enlarged structural diagram of section B in the middle;

[0035] Figure 6 This is a partial structural schematic diagram of the ammonia injection assembly of the present invention;

[0036] Figure 7 for Figure 6 Enlarged structural diagram of section C;

[0037] Figure 8 This is a schematic diagram of a partial separation structure of the ammonia injection assembly of the present invention;

[0038] Figure 9 This is a schematic diagram of the denitrification section of the present invention;

[0039] Figure 10 This is a schematic diagram of the internal structure of the housing of the present invention;

[0040] Figure 11 This is a schematic diagram of the structure of the grille component of the present invention.

[0041] In the diagram: 1. Denitrification container; 101. Upper cylinder; 102. Guide tube; 103. Middle cylinder; 104. Denitrification cylinder; 105. Lower cylinder; 2. Inlet pipe; 201. Fixing ring; 202. Connecting strip; 203. Air guide plate; 204. Reinforcing strip; 3. Outlet pipe; 301. Receiving box; 4. Rotating frame; 401. Partition plate; 5. Catalyst block; 6. Guide section; 601. Rotating shaft; 602. Guide plate; 7. Rotating pipe; 701. Connecting block; 702. Ammonia injection ring; 703. Ammonia injection nozzle; 704. Ammonia injection... 705. Hose; 8. Inlet pipe; 9. Moving ring; 10. Guide block; 11. Rotating ring; 12. First connecting rod; 13. Second connecting rod; 14. First guide rod; 15. Second guide rod; 16. Positioning ring; 17. Corrugated pipe; 18. Groove; 19. Flexible scraper; 10. Housing; 10. Rotating rod; 11. Drive motor; 12. Main bevel gear; 13. Rotating rod; 14. Secondary bevel gear; 15. Synchronous pulley; 16. Eccentric component; 17. Connecting rod; 17. Moving plate; 17. Elastic telescopic rod. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0044] like Figures 1 to 4 As shown, this embodiment proposes a catalytic device for denitrification treatment of ship exhaust gas, including a denitrification container 1 and an inlet pipe 2 and an outlet pipe 3 respectively disposed at both ends of the denitrification container 1; the denitrification container 1 is used to accommodate various functional components and provide reaction space, the inlet pipe 2 is used to introduce high-temperature exhaust gas emitted by the ship's diesel engine, and the outlet pipe 3 is used to discharge purified flue gas after denitrification treatment.

[0045] Specifically, the denitrification container 1 includes an upper cylinder 101, a guide cylinder 102, a middle cylinder 103, a denitrification cylinder 104, and a lower cylinder 105 connected sequentially from top to bottom. The upper cylinder 101 is fixedly connected to the inlet pipe 2, and the lower cylinder 105 is fixedly connected to the outlet pipe 3. The upper cylinder 101 is used to receive flue gas from the inlet pipe 2 and provide installation space for the ammonia injection assembly. The guide cylinder 102 is used to install the guide section 6 to guide the flow of flue gas. The middle cylinder 103 is used to connect the guide cylinder 102 and the denitrification cylinder 104. The denitrification cylinder 104 is used to install the denitrification section for catalytic reduction reaction. The lower cylinder 105 is used to collect the purified flue gas and introduce it into the outlet pipe 3.

[0046] like Figure 4 and Figure 11 As shown, in a preferred embodiment, based on the above method, a grid component is further provided inside the air inlet pipe 2. The grid component includes a fixing ring 201 fixed inside the air inlet pipe 2, connecting strips 202 equidistantly distributed inside the fixing ring 201, and air guide plates 203 disposed between two adjacent connecting strips 202. A reinforcing strip 204 is connected to one end of several air guide plates 203 on the same horizontal plane away from the connecting strips 202. The grid component is used to rectify the flue gas entering the denitrification container 1, cut and guide the turbulent large-scale vortex, so that the airflow becomes uniform and stable before entering the upper cylinder 101, providing a good flow field basis for subsequent ammonia injection and mixing.

[0047] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, in a preferred embodiment, based on the above method, the ammonia injection assembly is further disposed at the top of the denitrification container 1, and is used to spray urea aqueous solution onto the flue gas entering the denitrification container 1; the ammonia injection assembly includes a rotating pipe 7 rotatably disposed between the inlet pipe 2 and the upper cylinder 101, a connecting block 701 rotatably disposed at the bottom of the rotating pipe 7 via a pin, an ammonia injection ring 702 connected to the connecting block 701, ammonia injection nozzles 703 evenly arranged circumferentially on the ammonia injection ring 702, an ammonia injection hose 704 disposed in the rotating pipe 7 and connected to the ammonia injection ring 702, and a rotating joint connecting the ammonia injection hose 704 to the rotating pipe 7. 4. Connected inlet pipe 705; Rotating pipe 7 can rotate around its own axis, driving ammonia injection ring 702 to rotate circumferentially; Ammonia injection ring 702 is installed in connecting block 701, and connecting block 701 swings relative to rotating pipe 7 via pin, and a ball joint structure can be set at the pin connection; Ammonia injection nozzle 703 is used to atomize and spray urea aqueous solution, and ammonia injection hose 704 is a flexible pipe that can bend and deform with the swing of ammonia injection ring 702, always maintaining communication with ammonia injection ring 702; Inlet pipe 705 is connected to ammonia injection hose 704 via a rotating joint, and the rotating joint allows ammonia injection hose 704 to rotate with rotating pipe 7 without tangling.

[0048] like Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, in a preferred embodiment, based on the above method, a tilt adjustment assembly for driving the ammonia injection ring 702 to swing is further provided on the outer side of the rotating pipe 7; the tilt adjustment assembly includes a movable ring 8 slidably connected to the outer side of the rotating pipe 7, a rotating ring 9 circumferentially rotatably disposed on the outer side of the movable ring 8, a first connecting rod 901 hinged to the rotating ring 9, and a second connecting rod 902 with one end hinged to the first connecting rod 901 and the other end fixedly connected to the connecting block 701. A first guide rod 10 is fixedly provided on the outer side of the rotating pipe 7 and slidably connected to the rotating ring 9. The first guide rod 10 extends along the axial direction of the rotating pipe 7, so that the rotating ring 9 can slide along the first guide rod 10 but cannot rotate relative to the rotating pipe 7; a second guide rod 11 is fixedly provided on the inner wall of the intake pipe 2 and slidably connected to the movable ring 8. The second guide rod 11 extends along the axial direction of the intake pipe 2, so that the movable ring 8 can slide along the second guide rod 11 but cannot rotate relative to the intake pipe 2.

[0049] like Figure 6 , Figure 7 and Figure 8 As shown, in a preferred embodiment, based on the above method, a guide block 801 is fixedly provided on the inner wall of the moving ring 8, and a spiral guide groove that cooperates with the guide block 801 is provided on the outer side of the rotating tube 7. When the rotating tube 7 rotates, the guide block 801 slides along the spiral guide groove. Since the rotational freedom of the moving ring 8 is restricted by the second guide rod 11, the guide block 801 drives the moving ring 8 to reciprocate along the axial direction of the rotating tube 7 under the drive of the spiral guide groove. Two positioning rings 12 that are fixedly connected to the second guide rod 11 are circumferentially connected to the outer side of the rotating tube 7. A bellows 121 is provided between the positioning ring 12 and the moving ring 8. The bellows 121 is a flexible sealing element used to compensate for the relative displacement between the moving ring 8 and the positioning ring 12, and to prevent particles in the flue gas from adhering to the spiral guide groove and affecting the movement of the moving ring 8.

[0050] When the rotating tube 7 rotates, the moving ring 8 reciprocates axially with the cooperation of the spiral guide groove and the guide block 801, and the moving ring 8 drives the rotating ring 9 to move synchronously. The rotating ring 9 pulls the connecting block 701 through the first connecting rod 901 and the second connecting rod 902, so that the ammonia injection ring 702 swings in a pitching motion relative to the axis of the rotating tube 7. At the same time, the rotation of the rotating tube 7 drives the ammonia injection ring 702 to rotate circumferentially through the connecting block 701. The ammonia injection ring 702 has both circumferential rotation and axial swinging motion, so that the spraying direction of the ammonia injection nozzle 703 changes dynamically in three-dimensional space, realizing full coverage spraying of the flue section.

[0051] like Figure 4 and Figure 9As shown, in a preferred embodiment, based on the above method, the denitrification section is further disposed inside the denitrification container 1 for removing nitrogen oxides from the flue gas; the denitrification section includes a rotating frame 4 and a plurality of catalyst fan blocks 5 evenly disposed on the rotating frame 4 in a circular pattern, with adjacent catalyst fan blocks 5 separated by a partition 401 of the rotating frame 4; the denitrification section is disposed inside the denitrification cylinder 104, the rotating frame 4 is rotatably connected to the inner wall of the denitrification cylinder 104, and the rotating frame 4 can rotate around its own axis inside the denitrification cylinder 104; the catalyst fan blocks 5 are honeycomb catalyst modules with densely packed honeycomb channels inside, used to carry active components and provide a catalytic reaction surface; a rotating seal is provided between the inner wall of the denitrification cylinder 104 and the rotating frame 4 to prevent flue gas from bypassing and leaking through the gap between the rotating frame 4 and the inner wall of the denitrification cylinder 104.

[0052] like Figure 4 and Figure 11 As shown, in a preferred embodiment, based on the above method, a groove 13 is further provided on the inner wall of the denitrification cylinder 104. A flexible scraper 131 is provided in the groove 13 via a connecting rod, which moves against the outer wall of the catalyst fan block 5. The end of the partition plate 401 is provided with an inclined surface that cooperates with the flexible scraper 131. The front end of the flexible scraper 131 elastically abuts against the windward end face of the catalyst fan block 5. When the catalyst fan block 5 rotates with the rotating frame 4 and passes through the groove 13, the flexible scraper 131 scrapes off the accumulated dust, ammonium bisulfate scale, and other impurities attached to the windward end face of the catalyst fan block 5. A receiving box 301 for collecting impurities is provided at the bottom of the exhaust pipe 3. The heavier impurities that are scraped off fall into the receiving box 301 along the inner wall and inclined surface of the denitrification cylinder 104 and are collected in a concentrated manner.

[0053] like Figure 1 , Figure 2 , Figure 4 , Figure 9 and Figure 10 As shown, in a preferred embodiment, based on the above method, the drive unit is further disposed on the outside of the denitrification container 1, and is used to drive the rotating frame 4 to rotate inside the denitrification container 1 to adjust the denitrification working position of each catalyst block 5; the drive unit includes a housing 14 fixed on the outside of the denitrification cylinder 104, a rotating rod 141 rotatably disposed inside the housing 14, a drive motor 142 disposed on the housing 14 and used to drive the rotating rod 141 to rotate, a main bevel gear 143 disposed on the rotating rod 141, a rotating rod 15 rotatably disposed inside the denitrification cylinder 104 and connected to the rotating frame 4, and a secondary bevel gear 151 disposed on the rotating rod 15 and meshing with the main bevel gear 143; when the drive motor 142 starts, it drives the rotating rod 141 to rotate, and the rotating rod 141 transmits power to the rotating rod 15 through the meshing transmission of the main bevel gear 143 and the secondary bevel gear 151, and the rotating rod 15 drives the rotating frame 4 to rotate slowly, continuously or stepwise inside the denitrification cylinder 104;

[0054] The drive unit also includes synchronous pulleys 16 respectively mounted on the rotating rod 141 and the rotating tube 7, and a synchronous belt disposed between the two synchronous pulleys 16. When the rotating rod 141 rotates, it drives the rotating tube 7 to rotate synchronously through the synchronous pulleys 16 and the synchronous belt, thereby realizing the linkage drive between the ammonia injection assembly and the rotating frame 4. By setting the gear ratio of the synchronous pulleys 16, the rotational speed ratio between the rotating tube 7 and the rotating rod 141 can be adjusted so that the rotational speed of the ammonia injection ring 702 matches the rotational speed of the rotating frame 4.

[0055] like Figure 2 , Figure 3 and Figure 4 As shown, in a preferred embodiment, based on the above method, a further step is to provide a flow guide 6 within the denitrification container 1, positioned between the ammonia injection assembly and the denitrification section, for guiding the flue gas. The flow guide 6 includes several rotating shafts 601 rotatably disposed within the flow guide cylinder 102 and flow guide plates 602 disposed on the rotating shafts 601, with a flow guide channel between adjacent flow guide plates 602. The rotating shafts 601 can rotate in both directions around their own axis, causing the flow guide plates 602 to oscillate. The oscillation of the flow guide plates 602 causes the flue gas to continuously change its flow direction within the flow guide cylinder 102, extending the contact path and time between the flue gas and the atomized urea solution, promoting the pyrolysis of urea and the uniform mixing of ammonia and flue gas.

[0056] like Figure 2 , Figure 3 and Figure 4 As shown, in a preferred embodiment, based on the above method, the drive unit further includes an eccentric member 17 disposed on the rotating rod 141, a connecting rod 171 circumferentially rotatable on the eccentric member 17, a movable plate 172 hinged to the connecting rod 171 and sliding on the outside of the guide tube 102, and an elastic telescopic rod 173 with one end hinged to the movable plate 172 and the other end fixedly connected to the rotating shaft 601; the eccentric member 17 is an eccentric wheel or crank structure, fixed on the rotating rod 141 The upper part rotates with the rotating rod 141. One end of the connecting rod 171 is sleeved on the outer periphery of the eccentric member 17 and can rotate relative to the eccentric member 17. The other end of the connecting rod 171 is hinged to the moving plate 172. The moving plate 172 is slidably disposed on the guide rail outside the guide tube 102 and can reciprocate linearly along the axial direction of the guide tube 102. The elastic telescopic rod 173 is a telescopic elastic component (such as a spring rod or gas spring). One end of it is hinged to the moving plate 172 and the other end is fixedly connected to the rotating shaft 601.

[0057] When the rotating rod 141 rotates, the eccentric component 17 performs an eccentric rotational motion, which drives the moving plate 172 to reciprocate linearly on the outside of the guide tube 102 via the connecting rod 171. The moving plate 172 drives the rotating shaft 601 to reciprocate in both directions via the elastic telescopic rod 173, thereby causing the guide plate 602 to swing back and forth inside the guide tube 102. The elastic telescopic rod 173 can compensate for the changes in angle and distance between the guide plate 602 and the moving plate 172 during the swinging process, ensuring smooth transmission of motion.

[0058] The working principle includes the following steps:

[0059] S1: Start the marine diesel engine. The high-temperature exhaust gas enters the device through the intake pipe 2. The exhaust gas first passes through the grid in the intake pipe 2. The grid smooths the turbulent airflow, so that the airflow enters the upper cylinder 101 smoothly and evenly.

[0060] S2: Start the drive motor 142, which drives the rotating tube 7 to rotate through the synchronous pulley 16 and the synchronous belt. When the rotating tube 7 rotates, the moving ring 8 moves back and forth along the axis of the rotating tube 7 under the cooperation of the spiral guide groove and the guide block 801. The moving ring 8 drives the rotating ring 9 to move synchronously. Through the first connecting rod 901 and the second connecting rod 902, the ammonia injection ring 702 is driven to swing back and forth relative to the rotating tube 7. At the same time, the rotation of the rotating tube 7 drives the ammonia injection ring 702 to rotate circumferentially.

[0061] Urea aqueous solution enters the ammonia injection ring 702 through the inlet pipe 705, the rotary joint, and the ammonia injection hose 704, and is atomized and sprayed out by the ammonia injection nozzle 703, mixing with the incoming flue gas;

[0062] S3: The flue gas carrying the atomized urea solution enters the guide tube 102. The drive motor 142 simultaneously drives the guide plate 602 to swing back and forth around the rotating shaft 601 through the eccentric part 17, the connecting rod 171, the moving plate 172 and the elastic telescopic rod 173. The flue gas tortuously travels through the guide channel of the swinging guide plate 602, which prolongs the mixing time of urea and flue gas, and promotes the pyrolysis of urea into ammonia and uniform mixing with the flue gas.

[0063] S4: The uniformly mixed ammonia-containing flue gas enters the denitrification cylinder 104, passes through the catalyst sector 5 which is currently facing the bottom opening of the central cylinder 103, and within the honeycomb channels of the catalyst sector 5, NH3 and NO... x A selective catalytic reduction reaction occurs, generating N2 and H2O, thus achieving denitrification and purification;

[0064] S5: The drive motor 142 simultaneously drives the rotating rod 15 and the rotating frame 4 to rotate slowly, continuously or stepwise inside the denitrification cylinder 104 via the main bevel gear 143 and the secondary bevel gear 151. The rotating frame 4 drives each catalyst fan block 5 to pass through the bottom opening of the middle cylinder 103 in turn to receive the flue gas, so that each fan block takes turns to serve as the windward surface.

[0065] When the catalyst fan block 5 moves away from the main flue gas zone, its outer wall passes through the flexible scraper 131 in the groove 13. The flexible scraper 131 scrapes off the dust accumulated on the windward end face and outer periphery of the catalyst fan block 5.

[0066] When the catalyst fan block 5 rotates to the bottom, the end face that was originally facing the wind turns into the leeward side. The purified flue gas passes through the honeycomb channel of the fan block in the opposite direction, blowing out the residual loose dust in the channel and achieving self-cleaning.

[0067] S6: The purified and qualified flue gas is discharged into the atmosphere or subsequent treatment system through the lower cylinder 105 and the outlet pipe 3. The large impurities in the ash scraped off by the flexible scraper 131 move along the inclined surface inside the denitrification cylinder 104 and the airflow to the receiving box 301, while the light impurities are discharged along the outlet pipe 3 with the airflow.

[0068] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A catalytic device for denitrification treatment of ship exhaust gas, comprising a denitrification container (1) and an inlet pipe (2) and an outlet pipe (3) respectively disposed at both ends of the denitrification container (1), characterized in that, Also includes: The ammonia injection assembly is installed at the top of the denitrification container (1) and is used to spray urea aqueous solution onto the flue gas entering the denitrification container (1); The denitrification section is set inside the denitrification container (1) and is used to remove nitrogen oxides from the flue gas. The denitrification section includes a rotating frame (4) and a number of catalyst fan blocks (5) evenly arranged in a circle on the rotating frame (4). Two adjacent catalyst fan blocks (5) are separated by a partition (401) of the rotating frame (4). The guide section (6) is disposed inside the denitrification container (1) and placed between the ammonia injection assembly and the denitrification section, and is used to guide the flue gas; And a drive unit, located on the outside of the denitrification container (1), is used to drive the rotating frame (4) to rotate inside the denitrification container (1) to adjust the denitrification working position of each catalyst sector (5).

2. The catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that, The denitrification container (1) includes an upper cylinder (101), a guide cylinder (102), a middle cylinder (103), a denitrification cylinder (104), and a lower cylinder (105) arranged sequentially from top to bottom. The upper cylinder (101) is fixedly connected to the air inlet pipe (2), and the lower cylinder (105) is fixedly connected to the air outlet pipe (3).

3. The catalytic device for denitrification treatment of ship exhaust gas according to claim 2, characterized in that, The ammonia injection assembly includes a rotating pipe (7) rotatably disposed between the air inlet pipe (2) and the upper cylinder (101), a connecting block (701) rotatably disposed at the bottom of the rotating pipe (7) via a pin, an ammonia injection ring (702) connected in the connecting block (701), an ammonia injection nozzle (703) evenly arranged on the ammonia injection ring (702) in a circular pattern, an ammonia injection hose (704) disposed in the rotating pipe (7) and connected to the ammonia injection ring (702), and an inlet pipe (705) connected to the ammonia injection hose (704) via a rotating joint.

4. The catalytic device for denitrification treatment of ship exhaust gas according to claim 3, characterized in that, The outside of the rotating tube (7) is provided with an angle adjustment assembly for driving the ammonia injection ring (702) to swing. The angle adjustment assembly includes a moving ring (8) slidably connected to the outside of the rotating tube (7), a rotating ring (9) circumferentially rotatably disposed outside the moving ring (8), a first connecting rod (901) hinged to the rotating ring (9), and a second connecting rod (902) with one end hinged to the first connecting rod (901) and the other end fixedly connected to the connecting block (701). The outer side of the rotating tube (7) is fixed with a first guide rod (10) that is slidably connected to the rotating ring (9). The inner wall of the air intake pipe (2) is fixed with a second guide rod (11) that is slidably connected to the moving ring (8).

5. A catalytic device for denitrification treatment of ship exhaust gas according to claim 4, characterized in that, The inner wall of the moving ring (8) is fixed with a guide block (801), and the outer side of the rotating tube (7) is provided with a spiral guide groove that cooperates with the guide block (801). The outer circumferential connection of the rotating tube (7) consists of two positioning rings (12) that are fixedly connected to the second guide rod (11). A corrugated tube (121) is provided between the positioning ring (12) and the moving ring (8).

6. A catalytic device for denitrification treatment of ship exhaust gas according to claim 5, characterized in that, The denitrification section is installed inside the denitrification cylinder (104), the rotating frame (4) is rotatably connected to the inner wall of the denitrification cylinder (104), and a rotating seal is provided between the inner wall of the denitrification cylinder (104) and the outer wall of the rotating frame (4) and the partition (401); The inner wall of the denitrification cylinder (104) is provided with a groove (13), and a flexible scraper (131) is provided in the groove (13) through a connecting rod to move against the outer wall of the catalyst fan block (5). The bottom of the gas outlet pipe (3) is provided with a receiving box (301) for receiving impurities.

7. A catalytic device for denitrification treatment of ship exhaust gas according to claim 6, characterized in that, The drive unit includes a housing (14) fixed to the outside of the denitrification cylinder (104), a rotating rod (141) rotatably disposed in the housing (14), a drive motor (142) disposed on the housing (14) and used to drive the rotating rod (141) to rotate, a main bevel gear (143) disposed on the rotating rod (141), a rotating rod (15) rotatably disposed in the denitrification cylinder (104) and connected to the rotating frame (4), and a secondary bevel gear (151) disposed on the rotating rod (15) and meshing with the main bevel gear (143). The drive unit also includes a timing pulley (16) respectively disposed on the rotating rod (141) and the rotating tube (7) and a timing belt disposed between the two timing pulleys (16).

8. A catalytic device for denitrification treatment of ship exhaust gas according to claim 7, characterized in that, The flow guide (6) includes a plurality of rotating shafts (601) rotatably disposed in the flow guide cylinder (102) and flow guide plates (602) disposed on the rotating shafts (601), and a flow guide channel is provided between two adjacent flow guide plates (602).

9. A catalytic device for denitrification treatment of ship exhaust gas according to claim 8, characterized in that, The drive unit also includes an eccentric member (17) disposed on the rotating rod (141), a connecting rod (171) circumferentially rotatable on the eccentric member (17), a movable plate (172) hinged to the connecting rod (171) and sliding on the outside of the guide tube (102), and an elastic telescopic rod (173) with one end hinged to the movable plate (172) and the other end fixedly connected to the rotating shaft (601).

10. A catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that, The intake pipe (2) is provided with a grille, which includes a fixing ring (201) fixed in the intake pipe (2), connecting strips (202) equidistantly distributed in the fixing ring (201), and air guide plates (203) provided between two adjacent connecting strips (202). A reinforcing strip (204) is connected to one end of several air guide plates (203) on the same horizontal plane away from the connecting strips (202).

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