Catalytic device for denitration treatment of ship tail gas

Abstract

The invention discloses a catalytic device for denitration treatment of ship tail gas, and relates to the technical field of tail gas denitration, the catalytic device comprises an SCR reactor, the upper side of the SCR reactor is provided with a backflushing structure, the SCR reactor is internally provided with fixing supports in an array mode, the lower sides of the fixing supports are provided with flexible expansion bodies, and the flexible expansion bodies are provided with flexible expansion holes. Ejector blocks are movably arranged on the fixed bracket in an array manner; and the linkage mechanism comprises a limiting plate, a wedge-shaped movable rod and a cam, the limiting plate is fixedly installed on the ejector block, the wedge-shaped movable rod is movably inserted into the fixed support, the limiting plate abuts against the wedge-shaped movable rod, and the wedge-shaped movable rod is installed on one side of the cam. The gap after installation is filled through expansion of the flexible expansion body, the sealing performance of the catalyst after installation can be improved, more installation space can be provided before expansion of the flexible expansion body, and the convenience during equipment installation and the sealing performance after installation are improved.

Description

Technical Field

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

[0002] In the field of marine exhaust gas denitrification, selective catalytic reduction (SCR) technology has become mainstream due to its high efficiency and reliable nitrogen oxide emission reduction capabilities. The core of this technology lies in the catalyst module, which is typically installed in a modular form on the support structure inside the reactor. To ensure denitrification efficiency, the gaps between the catalyst module and the support structure, as well as between adjacent modules, must be tightly sealed to prevent excessive emissions due to flue gas leakage or incomplete reaction due to ammonia leakage. Furthermore, after long-term operation, the surface and internal micropores of the catalyst module can become clogged due to ash accumulation and ammonium bisulfate deposition, requiring periodic disassembly and replacement or offline regeneration. This places high demands on the ease of installation and disassembly.

[0003] Currently, catalyst modules are primarily installed and secured using methods such as bolt tightening or sealing. Bolt tightening relies on bolts to press the pressure plate against the module edge. While commonly used, this method requires individual bolt manipulation during assembly and disassembly. Furthermore, after operation, bolts often corrode and become stuck due to high temperatures and dust accumulation, making disassembly difficult. Additionally, tiny gaps may remain during installation, posing a risk of leakage. Sealing involves filling gaps with materials such as ceramic fiber felt to achieve a seal. However, during operation, these materials tend to adhere to the module, often requiring forceful hammering or even scraping during disassembly, which can easily damage the module. Summary of the Invention

[0004] The purpose of this invention is to provide a catalytic device for denitrification treatment of ship exhaust gas, so as to solve the problems mentioned in the background art, such as the difficulty in sealing small gaps during the installation of existing catalysts and the difficulty in disassembling catalysts after they have been sealed.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a catalytic device for denitrification treatment of ship exhaust gas, comprising an SCR reactor, a backflushing structure provided on the upper side of the SCR reactor, a fixed support array installed inside the SCR reactor, a flexible expansion body provided on the lower side of the fixed support, and top blocks movably arranged in an array on the fixed support. The linkage mechanism includes a limiting plate, a wedge-shaped movable rod, and a cam. The limiting plate is fixedly installed on the top block, and the wedge-shaped movable rod is movably inserted into the fixed bracket. The limiting plate and the wedge-shaped movable rod abut against each other, and the wedge-shaped movable rod is installed on one side of the cam. The ventilation mechanism includes a mounting box, a rotating block, and a connecting air pipe. Two sets of mounting boxes are fixedly installed on the SCR reactor. A rotating block is rotatably installed inside the mounting box. A cam is fixedly installed on the rotating block. A connecting air pipe is fixedly installed on one side of the mounting box. The upper end of the connecting air pipe is fixed and connected to the outlet pipe of the backflushing structure. The connecting air pipe is connected to the flexible expansion body.

[0006] Preferably, a sealing gasket is fixedly installed on the lower side of the flexible expansion body, a venting groove is provided inside the fixed bracket, an inlet / outlet groove is provided on the lower side of the venting groove, the venting groove is connected to the flexible expansion body through the inlet / outlet groove, and the lower end of the top block is inserted into the flexible expansion body and fixedly installed on the upper side of the sealing gasket.

[0007] Preferably, the upper side of the fixed bracket is provided with a placement groove, the upper end of the top block is engaged in the placement groove and the upper end is flush with the upper end of the fixed bracket, a sealing groove is provided in each placement groove, a second sealing ring is fixedly installed on the top block and inserted into the sealing groove, and the edge of the upper end of the top block is rounded.

[0008] Preferably, the linkage mechanism further includes a first movable groove, a first connecting plate, a hinge rod, a second connecting plate, a guide hole, a guide rod, a limiting groove, a limiting block, a mounting through groove, a first connecting rod, and a return spring. The inner wall of the SCR reactor is provided with an array of first movable grooves, the positions of which are opposite to the fixed brackets. A first connecting plate is movably inserted into the first movable groove. A hinge rod is rotatably mounted on the first connecting plate. A second connecting plate is movably disposed on one side of the first connecting plate. One side of the hinge rod mounted on the first connecting plate is rotatably mounted on the second connecting plate. A wedge-shaped movable rod is fixedly mounted on the second connecting plate. A guide hole is provided on the second connecting plate. A guide rod is fixedly mounted in the first movable groove and inserted into the guide hole. A mounting through groove is provided on the first connecting plate. A limiting block is fixedly mounted in the first movable groove and inserted into the mounting through groove.

[0009] Preferably, the linkage mechanism further includes a limiting block, a mounting slot, a first connecting rod, and a return spring. The SCR reactor has a mounting slot that communicates with a first movable slot. The same set of first connecting rods is fixedly installed on the upper side of the two sets of first connecting plates. The first connecting rods move within the mounting slot. Two sets of return springs are provided within the mounting slot. The upper side of the return spring abuts against the upper side of the mounting slot, and the lower side abuts against the upper side of the first connecting rod. A cam is rotatably installed within the mounting slot, and the cam abuts against the lower side of the first connecting rod.

[0010] Preferably, the ventilation mechanism further includes a mounting bracket, an insertion block, an insertion slot, and a sealing rubber ring. The mounting brackets are fixedly installed in an array on the inner wall of the SCR reactor. The same set of insertion blocks are fixedly installed on two sets of the mounting brackets. An insertion slot is opened in the fixed bracket, and the insertion block is inserted into the insertion slot. A sealing rubber ring is fixedly installed at one end of the fixed bracket, and the sealing rubber ring abuts against the opening edge of the first movable slot on the inner wall of the SCR reactor.

[0011] Preferably, the ventilation mechanism further includes a threaded groove, a second movable groove, a second connecting rod, a wedge-shaped compression block, and a locking groove. The mounting bracket has a threaded groove and a second movable groove. A hexagonal threaded sleeve is threaded onto the mounting bracket. The second connecting rod is movably inserted into the second movable groove. Wedge-shaped compression blocks are fixedly installed on the upper and lower sides of the second connecting rod. The wedge-shaped compression blocks abut against one side of the hexagonal threaded sleeve. Two sets of locking grooves are provided on the end of the fixed bracket. The wedge-shaped compression blocks are inserted into the locking grooves.

[0012] Preferably, the ventilation mechanism further includes a first sealing ring, a first ventilation groove, an exhaust groove, a rotary motor, a pressure sensor, and a second ventilation groove. The first sealing ring is fixedly installed on the outer side of the rotating block, and the outer side of the first sealing ring abuts against the inner side of the mounting box. The first ventilation groove is formed inside the rotating block, and an exhaust groove is formed on one side of the mounting box. A rotary motor is fixedly installed on the mounting box, and a rotating block is fixedly installed on the output shaft of the rotary motor. A pressure sensor is fixedly installed on the cam, and a second ventilation groove is arrayed on the cam, and the second ventilation groove and the first ventilation groove are connected.

[0013] Preferably, the wedge-shaped movable rod is a fold-back type, the wedge-shaped movable rod is disposed on both sides of the top block, the wedge-shaped movable rod is fixedly mounted with an array of reinforcing ribs, the end of the wedge-shaped movable rod is inserted into the first movable groove, the wedge-shaped movable rod is inserted into the ventilated long groove, and the distance between the upper end of the wedge-shaped movable rod and the ventilated long groove is adapted to the thickness of the limiting plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. When the present invention is used, the gap after installation is filled by the expansion of the flexible expander, which not only increases the sealing after the catalyst is installed, but also provides more installation space before the flexible expander expands, which increases the convenience of equipment installation and the sealing after installation. The equipment is also equipped with a top block, which can make the catalyst move slightly by lifting it during disassembly, thereby separating the connection between the catalyst and the fixed support, thus reducing the difficulty of catalyst disassembly caused by blockage and solidification during long-term use. 2. The top block and the flexible expander of the present invention are synchronized. The movement of the top block and the air intake and exhaust of the flexible expander are related. Although the flexible expander expands by using the pressure of the recoil structure, it has the ability to force exhaust under the linkage of the top block. Compared with conventional airbags, the expansion of the flexible expander and the top block in this device are both forced, which increases the convenience and stability of catalyst disassembly and assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall internal structure provided for an embodiment of the present invention; Figure 3 This is a schematic diagram of the structural separation at the fixed bracket provided in an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the flexible expansion body provided in an embodiment of the present invention; Figure 5 This is a schematic cross-sectional view of the fixed bracket provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure at the top block provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the wedge-shaped movable rod provided in an embodiment of the present invention; Figure 8 This is a schematic cross-sectional view of the SCR reactor provided in an embodiment of the present invention; Figure 9 This is a schematic cross-sectional view of the structure at the first connecting plate provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structural separation at the cam location provided in an embodiment of the present invention; Figure 11 Provided for embodiments of the present invention Figure 4 A magnified view of part A in the diagram; Figure 12 Provided for embodiments of the present invention Figure 8 A magnified view of part B in the diagram; Figure 13 Provided for embodiments of the present invention Figure 9 A magnified view of part of C in the diagram.

[0016] In the diagram: 1. SCR reactor; 2. Backflush structure; 3. Fixed support; 4. Flexible expander; 5. Top block; 6. Linkage mechanism; 601. Limiting plate; 602. Wedge-shaped movable rod; 603. First movable groove; 604. First connecting plate; 605. Hinge rod; 606. Second connecting plate; 607. Guide hole; 608. Guide rod; 609. Limiting groove; 610. Limiting block; 611. Mounting through groove; 612. First connecting rod; 613. Return spring; 614. Cam; 7. Ventilation mechanism; 701. Mounting support; 702. Insertion block; 703. Insertion slot; 704. Sealing rubber ring; 705. Threaded groove; 706. Second movable groove; 707. Second connecting rod; 708. Wedge-shaped pressing block; 709. Engaging groove; 710. Mounting box; 711. Rotating block; 712. First sealing rubber ring; 713. First venting groove; 714. Connecting air pipe; 715. Exhaust long groove; 716. Rotary motor; 717. Air pressure sensor; 718. Second venting groove; 8. Sealing gasket; 9. Venting long groove; 10. Inlet / outlet air groove; 11. Placement groove; 12. Sealing groove; 13. Second sealing rubber ring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-13 The present invention provides a technical solution: a catalytic device for denitrification treatment of ship exhaust gas, including an SCR reactor 1, a backflushing structure 2 provided on the upper side of the SCR reactor 1, a fixed support 3 arranged in an array inside the SCR reactor 1, a flexible expansion body 4 provided on the lower side of the fixed support 3, and a top block 5 arranged in an array on the fixed support 3. Linkage mechanism 6 includes a limiting plate 601, a wedge-shaped movable rod 602 and a cam 614. The limiting plate 601 is fixedly installed on the top block 5. The wedge-shaped movable rod 602 is movably inserted into the fixed bracket 3. The limiting plate 601 and the wedge-shaped movable rod 602 abut against each other. The wedge-shaped movable rod 602 is installed on one side of the cam 614. The ventilation mechanism 7 includes a mounting box 710, a rotating block 711, and a connecting air pipe 714. Two sets of mounting boxes 710 are fixedly installed on the SCR reactor 1. The rotating block 711 is rotatably installed inside the mounting box 710. A cam 614 is fixedly installed on the rotating block 711. The connecting air pipe 714 is fixedly installed on one side of the mounting box 710. The upper end of the connecting air pipe 714 is fixed and connected to the air outlet pipe of the backflushing structure 2. The connecting air pipe 714 is connected to the flexible expansion body 4.

[0019] The backflushing structure 2 in this device consists of a gas tank, valves, and ventilation pipes, used to clean the catalyst. The gas pressure within the backflushing structure 2 serves as the power source for the expansion of the flexible expander 4. The pressure holding and depressurization of the flexible expander 4 are achieved by rotating the circular block 711 to switch the gas channels. When the flexible expander 4 is in a depressurized state, the top block 5 can lift the catalyst, breaking any solidification that may occur at the interface between the catalyst and the catalyst, allowing for easy extraction. The flexible expander 4 is made of a high-temperature resistant flexible material with an internal space for gas injection. Existing mature materials, such as silicone rubber, are used; no material limitations are specified here. When the top block 5 rises, it can force the flexible expander 4 to contract, breaking any adhesion that may occur between the lower side of the flexible expander 4 and the catalyst, thus achieving convenient, sealed installation and low-resistance disassembly of the catalyst.

[0020] Furthermore, a sealing gasket 8 is fixedly installed on the lower side of the flexible expansion body 4, and a venting groove 9 is opened in the fixed bracket 3. An inlet / outlet groove 10 is opened on the lower side of the venting groove 9. The venting groove 9 is connected to the flexible expansion body 4 through the inlet / outlet groove 10. The lower end of the top block 5 is inserted into the flexible expansion body 4 and fixedly installed on the upper side of the sealing gasket 8. The main function of the flexible expansion body 4 is to expand, and the main function of the sealing gasket 8 is to fit against the edge of the catalyst. This structure makes the contraction of the flexible expansion body 4 and the movement of the top block 5 synchronized. It should be noted that the catalyst needs to be installed from bottom to top, while it needs to be disassembled from top to bottom. The reason is that the top block 5 itself has a certain degree of floating. When installing the catalyst, the lower side of the flexible expansion body 4 and the catalyst will be pushed up by a certain gap. At this time, the top block 5 will be pushed up without hindering the normal installation of the catalyst. Furthermore, the upper side of the fixed bracket 3 is provided with placement grooves 11. The upper end of the top block 5 is engaged in the placement groove 11 and is flush with the upper end of the fixed bracket 3. Each placement groove 11 is provided with a sealing groove 12. A second sealing ring 13 is fixedly installed on the top block 5 and inserted into the sealing groove 12. The upper edge of the top block 5 is rounded. The upper edge of the top block 5 is rounded because when installing the catalyst, if the lower layer is installed with the catalyst, the flexible expansion body 4 on the lower side may be close to the edge of the catalyst, which may push the top block 5 up by a certain gap. With the guidance of the rounded corner, the top block 5 can be pressed down smoothly when inserting the catalyst, which increases the convenience of using the equipment. After installation, the catalyst presses tightly against the top block 5, so that the second sealing ring 13 is pressed into the sealing groove 12 for sealing. This can block the small gaps at the moving parts of the top block 5 and increase the stability of the equipment during use. Furthermore, the linkage mechanism 6 also includes a first movable groove 603, a first connecting plate 604, a hinge rod 605, a second connecting plate 606, a guide hole 607, a guide rod 608, a limiting groove 609, a limiting block 610, a mounting through groove 611, a first connecting rod 612, and a return spring 613. The inner wall of the SCR reactor 1 is provided with an array of first movable grooves 603, the positions of which are opposite to those of the fixed bracket 3. A first connecting plate 604 is movably inserted into the first movable groove 603, and hinge rods 605 are rotatably mounted on the first connecting plate 604. A second connecting plate 606 is movably provided on one side of the first connecting plate 604. A hinge rod 605 mounted on the first connecting plate 604 is rotatably mounted on one side of the second connecting plate 606. A wedge-shaped movable rod 602 is fixedly mounted in an array on the second connecting plate 606. A guide hole 607 is opened in an array on the second connecting plate 606. A guide rod 608 is fixedly mounted in an array in the first movable groove 603. The guide rod 608 is inserted into the guide hole 607. An installation through groove 611 is opened in an array on the first connecting plate 604. A limit block 610 is fixedly mounted in an array in the first movable groove 603. The limit block 610 is inserted into the installation through groove 611. The structure is a linkage structure between the wedge-shaped movable rods 602. The wedge-shaped movable rods 602 can move synchronously under the action of this structure. Its main function is to lift the top block 5, so that the top block 5 can lift the catalyst and tighten the flexible expansion body 4. The first movable groove 603 is opened in the SCR reactor 1, but has several openings opposite to the position of the fixed support 3. The wedge-shaped movable rods 602 are inserted into the ventilation groove 9 and also into the first movable groove 603. The first movable groove 603 not only provides movement space but also serves as a ventilation channel. Therefore, the first connecting plate 604, hinge rod 605, and second connecting plate 606 in the first movable groove 603 will not completely block the first movable groove 603. Furthermore, the linkage mechanism 6 also includes a limiting block 610, a mounting slot 611, a first connecting rod 612, and a return spring 613. The SCR reactor 1 has a mounting slot 611, which is connected to the first movable slot 603. The same set of first connecting rods 612 are fixedly installed on the upper side of the two sets of first connecting plates 604. The first connecting rods 612 move within the mounting slot 611. Two sets of return springs 613 are provided within the mounting slot 611. The upper side of the return spring 613 abuts against the upper side of the mounting slot 611, and the lower side abuts against the upper side of the first connecting rod 612. A cam 614 is rotatably installed within the mounting slot 611, and the cam 614 abuts against the lower side of the first connecting rod 612. This structure is the drive structure for the wedge-shaped movable rod 602. The rotation of the cam 614 can drive the first connecting rod 612 to move up and down, thereby driving the first connecting plate 604 to move up and down, and thus causing the top block 5 to move. The key feature is that the first connecting rod 612 is only lifted when the cam 614 rotates to one side, and the first connecting rod 612 is not lifted when it rotates to the other side. This provides the conditions for the subsequent airway switching function. Furthermore, the ventilation mechanism 7 also includes a mounting bracket 701, an insertion block 702, an insertion slot 703, and a sealing rubber ring 704. The mounting brackets 701 are fixedly mounted in an array on the inner wall of the SCR reactor 1. The same set of insertion blocks 702 are fixedly mounted on the two sets of mounting brackets 701. An insertion slot 703 is opened in the fixed bracket 3, and the insertion block 702 is inserted into the insertion slot 703. A sealing rubber ring 704 is fixedly mounted on one end of the fixed bracket 3. The sealing rubber ring 704 abuts against the opening edge of the first movable slot 603 on the inner wall of the SCR reactor 1. This structure is the mounting and dismounting structure of the fixed bracket 3. Although the wedge-shaped movable rod 602 is composed of wedge-shaped blocks, its inclined side is bidirectional. Therefore, when the fixed bracket 3 is disassembled relative to the movement of the wedge-shaped movable rod 602, the top block 5 can also rise without hindering the overall detachment of the fixed bracket 3. The structures on the fixed bracket 3 are all in direct contact with the catalyst, such as the flexible expansion body 4 and the top block 5. Therefore, during use, compared with the wedge-shaped movable rod 602 and the internal structure of the first movable groove 603, the flexible expansion body 4 and the top block 5 experience the greatest wear and have the highest probability of damage. Therefore, the flexible expansion body 4 and the top block 5 can be disassembled and replaced as a whole, which facilitates equipment maintenance and reduces equipment maintenance costs. Furthermore, the ventilation mechanism 7 also includes a threaded groove 705, a second movable groove 706, a second connecting rod 707, a wedge-shaped compression block 708, and a locking groove 709. The mounting bracket 701 has the threaded groove 705 and the second movable groove 706. A hexagonal threaded sleeve is threaded onto this mounting bracket 701. The second connecting rod 707 is movably inserted into the second movable groove 706. Wedge-shaped compression blocks 708 are fixedly installed on both the upper and lower sides of the second connecting rod 707, and the wedge-shaped compression blocks 708 abut against one side of the hexagonal threaded sleeve. Two sets of locking grooves 709 are provided on the end of the fixed bracket 3, and the wedge-shaped compression blocks 708 are inserted into the locking grooves 709. This structure is the fixing structure of the fixed bracket 3. Through compression, the fixed bracket 3 is fixed on one hand, and the connection between the ventilation slot 9 and the first movable groove 603 is ensured on the other hand, increasing the stability of the equipment after installation. Furthermore, the ventilation mechanism 7 also includes a first sealing ring 712, a first ventilation groove 713, an exhaust groove 715, a rotary motor 716, a pressure sensor 717, and a second ventilation groove 718. The first sealing ring 712 is fixedly installed on the outer side of the rotating block 711, and the outer side of the first sealing ring 712 abuts against the inner side of the mounting box 710. The first ventilation groove 713 is opened inside the rotating block 711. An exhaust groove 715 is opened on one side of the mounting box 710. The rotary motor 716 is fixedly installed on the mounting box 710. The rotating block 711 is fixedly installed on the output shaft of the rotary motor 716. The pressure sensor 717 is fixedly installed on the cam 614. The second ventilation groove 718 is arrayed on the cam 614, and the second ventilation groove 718 communicates with the first ventilation groove 713. This structure is a gas path switching mechanism, which also has the ability to drive the cam 614 and detect the air pressure, so that the flexible expansion body 4 has three states: inflation, pressure holding and deflation, and has a time sequence with the movement of the top block 5, which increases the stability and functionality of the equipment during use. Furthermore, the wedge-shaped movable rod 602 is a folded-back type, and is located on both sides of the top block 5. Reinforcing ribs are fixedly mounted on the wedge-shaped movable rod 602 in an array. The end of the wedge-shaped movable rod 602 is inserted into the first movable groove 603 and into the ventilation groove 9. The distance between the upper end of the wedge-shaped movable rod 602 and the ventilation groove 9 is adapted to the thickness of the limiting plate 601. The reason why the wedge-shaped movable rod 602 is folded back is, on the one hand, to simultaneously lift both sides of the limiting plate 601 to ensure stability during lifting, and on the other hand, to leave a ventilation channel to prevent the wedge-shaped movable rod 602 from blocking air. Simultaneously, the distance between the wedge-shaped movable rod 602 and the ventilation groove 9 ensures that when the fixed bracket 3 is disassembled, the limiting plate 601 can slide on the wedge-shaped movable rod 602 without obstruction, ensuring stability during disassembly. Working principle: When using this invention, the fixing bracket 3 needs to be installed first. The fixing bracket 3 is inserted into the mounting bracket 701, and the insertion block 702 is inserted into the insertion slot 703, so that the sealing rubber ring 704 abuts against the inner wall of the SCR reactor 1, and the venting long slot 9 is connected to the first movable slot 603. Then, the hexagonal screw sleeve on the mounting bracket 701 is rotated, so that the wedge-shaped extrusion block 708 moves and abuts against the edge of the locking slot 709. Through the shape guidance of the wedge-shaped extrusion block 708, the sealing rubber ring 704 is pressed tightly against the inner wall of the SCR reactor 1. At this time, the venting long slot 9 is connected to the first movable slot 603. Disassembly is the same.

[0021] When installing the catalyst, insert the catalyst between the four sets of fixed supports 3. At this time, the catalyst presses down on the top block 5 on the lower fixed support 3, so the catalyst needs to be installed step by step from bottom to top. After it is placed, start the rotary motor 716. The output shaft of the rotary motor 716 drives the rotating block 711 to rotate, so that the first venting groove 713 is opposite to the connecting gas pipe 714. At this time, the gas in the gas tank in the backflushing structure 2 is injected into the second venting groove 718 through the first venting groove 713, and then into the first movable groove 603 through the installation groove 611. The gas in the first movable groove 603 will enter the venting long groove 9 and enter the flexible expansion body 4 through the inlet and outlet groove 10, so that the flexible expansion body 4 expands and seals the edge of the catalyst. After the pressure sensor 717 detects that the pressure has reached a certain amount, the output shaft of the rotary motor 716 reverses to reset the rotating block 711, so that the flexible expansion body 4 maintains pressure and maintains a certain expansion rate.

[0022] When disassembling the catalyst, start the rotary motor 716 to rotate the rotating block 711 so that the rotating block 711 is aligned with the exhaust groove 715, allowing the air pressure inside the flexible expansion body 4 to be released. When rotating the rotating block 711, the upper part of the cam 614 is rotated, causing the first connecting rod 612 to be lifted, thereby causing the first connecting plate 604 to rise, driving the hinge rod 605 to gradually level, thereby pushing the second connecting plate 606 to move, causing the wedge-shaped movable rod 602 to move within the ventilation groove 9. Guided by the shape of the wedge-shaped movable rod 602, the limiting plate 601 rises, which in turn causes the top block 5 to rise, thereby lifting the catalyst. Then the catalyst can be extracted. Resetting is done in the same way.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A catalytic device for denitrification treatment of ship exhaust gas, comprising an SCR reactor (1), wherein a backflushing structure (2) is provided on the upper side of the SCR reactor (1), characterized in that: The SCR reactor (1) is equipped with a fixed support (3) in an array. A flexible expansion body (4) is provided on the lower side of the fixed support (3). A top block (5) is movably arranged on the fixed support (3). The linkage mechanism (6) includes a limiting plate (601), a wedge-shaped movable rod (602), and a cam (614). The limiting plate (601) is fixedly installed on the top block (5). The wedge-shaped movable rod (602) is movably inserted into the fixed bracket (3). The limiting plate (601) and the wedge-shaped movable rod (602) abut against each other. The wedge-shaped movable rod (602) is installed on one side of the cam (614). Ventilation mechanism (7), the ventilation mechanism (7) includes mounting box (710), rotating block (711) and connecting air pipe (714). Two sets of mounting boxes (710) are fixedly installed on the SCR reactor (1). Rotating block (711) is rotatably installed inside the mounting box (710). Cam (614) is fixedly installed on the rotating block (711). Connecting air pipe (714) is fixedly installed on one side of the mounting box (710). The upper end of the connecting air pipe (714) is fixed and connected to the air outlet pipe of the backflushing structure (2). The connecting air pipe (714) is connected to the flexible expander (4).

2. The catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that: A sealing gasket (8) is fixedly installed on the lower side of the flexible expansion body (4). A ventilation slot (9) is provided in the fixed bracket (3). An air inlet / outlet slot (10) is provided on the lower side of the ventilation slot (9). The ventilation slot (9) is connected to the flexible expansion body (4) through the air inlet / outlet slot (10). The lower end of the top block (5) is inserted into the flexible expansion body (4) and fixedly installed on the upper side of the sealing gasket (8).

3. The catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that: The upper side of the fixed bracket (3) is provided with a placement groove (11). The upper end of the top block (5) is engaged in the placement groove (11) and the upper end is flush with the upper end of the fixed bracket (3). A sealing groove (12) is provided in each of the placement grooves (11). A second sealing ring (13) is fixedly installed on the top block (5). The second sealing ring (13) is inserted into the sealing groove (12). The upper edge of the top block (5) is rounded.

4. A catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that: The linkage mechanism (6) further includes a first movable groove (603), a first connecting plate (604), a hinge rod (605), a second connecting plate (606), a guide hole (607), a guide rod (608), a limiting groove (609), a limiting block (610), an installation through groove (611), a first connecting rod (612), and a return spring (613). The SCR reactor (1) has an array of first movable grooves (603) on its inner wall. The position of the first movable groove (603) is opposite to the position of the fixed bracket (3). The first connecting plate (604) is movably inserted into the first movable groove (603). The first connecting plate (605) is rotatably mounted on the first connecting plate (604). One of the first connecting plate (604) has a hinge rod (605) rotatably mounted on it. A second connecting plate (606) is movably provided on the side. One side of the hinge rod (605) installed on the first connecting plate (604) is rotatably installed on the second connecting plate (606). A wedge-shaped movable rod (602) is fixedly installed in an array on the second connecting plate (606). A guide hole (607) is opened in an array on the second connecting plate (606). A guide rod (608) is fixedly installed in an array in the first movable groove (603). The guide rod (608) is inserted into the guide hole (607). An installation through groove (611) is opened in an array on the first connecting plate (604). A limit block (610) is fixedly installed in an array in the first movable groove (603). The limit block (610) is inserted into the installation through groove (611).

5. A catalytic device for denitrification treatment of ship exhaust gas according to claim 4, characterized in that: The linkage mechanism (6) further includes a limiting block (610), an installation through groove (611), a first connecting rod (612), and a return spring (613). The SCR reactor (1) is provided with an installation through groove (611), which is connected to the first movable groove (603). The same set of first connecting rods (612) are fixedly installed on the upper side of the two sets of first connecting plates (604). The first connecting rods (612) move in the installation through groove (611). Two sets of return springs (613) are provided in the installation through groove (611). The upper side of the return spring (613) abuts against the upper side of the installation through groove (611), and the lower side abuts against the upper side of the first connecting rod (612). A cam (614) is rotatably installed in the installation through groove (611), and the cam (614) abuts against the lower side of the first connecting rod (612).

6. A catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that: The ventilation mechanism (7) further includes a mounting bracket (701), an insertion block (702), an insertion slot (703), and a sealing rubber ring (704). The mounting brackets (701) are fixedly installed in an array on the inner wall of the SCR reactor (1). The same set of insertion blocks (702) are fixedly installed on the two sets of mounting brackets (701). An insertion slot (703) is opened in the fixed bracket (3). The insertion block (702) is inserted into the insertion slot (703). A sealing rubber ring (704) is fixedly installed at one end of the fixed bracket (3). The sealing rubber ring (704) abuts against the opening edge of the first movable slot (603) on the inner wall of the SCR reactor (1).

7. A catalytic device for denitrification treatment of ship exhaust gas according to claim 6, characterized in that: The ventilation mechanism (7) further includes a threaded groove (705), a second movable groove (706), a second connecting rod (707), a wedge-shaped extrusion block (708), and a locking groove (709). The mounting bracket (701) is provided with a threaded groove (705) and a second movable groove (706). A hexagonal threaded sleeve is installed on the mounting bracket (701) by thread. The second connecting rod (707) is movably inserted in the second movable groove (706). The wedge-shaped extrusion block (708) is fixedly installed on the upper and lower sides of the second connecting rod (707). The wedge-shaped extrusion block (708) abuts against one side of the hexagonal threaded sleeve. Two sets of locking grooves (709) are provided on the end of the fixed bracket (3). The wedge-shaped extrusion block (708) is inserted in the locking groove (709).

8. A catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that: The ventilation mechanism (7) further includes a first sealing ring (712), a first ventilation groove (713), an exhaust groove (715), a rotary motor (716), a pressure sensor (717), and a second ventilation groove (718). The first sealing ring (712) is fixedly installed on the outer side of the rotating block (711), and the outer side of the first sealing ring (712) abuts against the inner side of the mounting box (710). The first ventilation groove (713) is opened in the rotating block (711). The mounting box (710) has an exhaust slot (715) on one side. A rotary motor (716) is fixedly mounted on the mounting box (710). A rotating block (711) is fixedly mounted on the output shaft of the rotary motor (716). A pressure sensor (717) is fixedly mounted on the cam (614). A second ventilation slot (718) is arrayed on the cam (614). The second ventilation slot (718) and the first ventilation slot (713) are connected.

9. A catalytic device for denitrification treatment of ship exhaust gas according to claim 1, characterized in that: The wedge-shaped movable rod (602) is a folded type. The wedge-shaped movable rod (602) is set on both sides of the top block (5). Reinforcing ribs are fixedly installed on the wedge-shaped movable rod (602) in an array. The end of the wedge-shaped movable rod (602) is inserted into the first movable groove (603). The wedge-shaped movable rod (602) is inserted into the ventilation long groove (9). The distance between the upper end of the wedge-shaped movable rod (602) and the ventilation long groove (9) is adapted to the thickness of the limiting plate (601).

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