A SCR denitrification reactor

Abstract

The present application relates to the technical field of flue gas purification, improves the problem of dust in the catalyst layer in the prior art that the pores are easily blocked, and discloses an SCR denitration reactor, which includes a tower body and an ammonia spraying mechanism, the tower body includes a smoke inlet pipe, a flow guide pipe, a reaction chamber and an exhaust pipe that are sequentially arranged and interconnected; the ammonia spraying mechanism is arranged in the flow guide pipe; it also includes a catalyst box and a catalyst assembly; a single catalyst box and a single catalyst assembly are a group; the catalyst box is provided with a plurality of catalytic holes; the catalyst assembly includes a base frame and a plurality of catalyst rods; the catalyst box is slidably connected to the tower body, and the SCR denitration reactor also includes a lifting drive assembly for driving the catalyst box to move; the catalyst rod is hollow, and an airflow guide module is arranged in the catalyst rod. The present application can guide particulate matter into the catalyst rod through the cooperation of the airflow guide module and the catalyst rod, thereby reducing the probability of clogging of the catalyst layer.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas purification, and in particular to an SCR denitration reactor. Background Art

[0002] The SCR denitrification tower is an efficient and environmentally friendly device that uses a catalyst to reduce NOx in flue gas to nitrogen and water. In the SCR process, the flue gas first enters the preheater to increase the gas temperature to the optimal reaction temperature range of the catalyst. In the tower, ammonia and other reducing agents are sprayed into the flue gas through a nozzle array and mixed evenly with the flue gas under the action of a mixer. The mixed flue gas enters the multi-layer catalyst layer, and under the action of the catalyst, NOx reacts chemically with the reducing agent to generate nitrogen and water vapor. The treated flue gas is discharged from the denitrification tower through the outlet flue to achieve the purpose of reducing NOx emissions.

[0003] The SCR denitrification tower is mainly composed of the following parts: Nozzle array: used to spray reducing agents such as ammonia water or ammonia gas evenly into the flue gas to ensure that the reducing agent and the flue gas are fully mixed. Mixer: further promote the mixing uniformity of the reducing agent and the flue gas and improve the denitrification efficiency. Heater: used to adjust the flue gas temperature so that it reaches the optimal reaction temperature range of the catalyst (generally 230℃-450℃, and the commonly used temperature is 320℃-400℃). Multilayer catalyst: The catalyst is the core of the SCR denitrification reaction, usually made of titanium dioxide and mixed with components such as vanadium pentoxide, molybdenum trioxide and tungsten trioxide. The quality and performance of the catalyst directly affect the denitrification efficiency. Guide vane: used to guide the flow direction of the flue gas in the denitrification tower to ensure that the flue gas is fully in contact with the catalyst. Outlet flue: The treated flue gas is discharged from the denitrification tower through the outlet flue.

[0004] With regard to the above-mentioned related technologies, in the prior art, since flue gas mixed with ammonia reacts in the honeycomb multi-layer catalyst layer, the dust mixed in the flue gas enters the catalyst layer and blocks the pores of the catalyst layer, which may affect the contact between the catalyst and the mixed flue gas at the least, or block the catalyst layer at the worst. Therefore, a solution for preventing the catalyst layer from being blocked is urgently needed to improve the flue gas treatment efficiency. Summary of the invention

[0005] In order to improve the defect of dust in the catalyst layer of the prior art that the pores are easily blocked, the present application provides an SCR denitration reactor.

[0006] The following technical solutions are adopted: A SCR denitration reactor comprises a tower body and an ammonia injection mechanism, wherein the tower body comprises a smoke inlet duct, a guide duct, a reaction chamber and an exhaust duct which are arranged in sequence and are interconnected; the ammonia injection mechanism is arranged in the guide duct; the SCR denitration reactor also comprises a catalyst box and a catalyst assembly; a single catalyst box and a single catalyst assembly form a group, and a plurality of groups are arranged in sequence in the reaction chamber along the gravity direction; a plurality of catalyst holes are arranged in an array on the catalyst box; the catalyst assembly comprises a base frame and a plurality of catalyst rods, one end of the catalyst rods is connected to the base frame, and the other end extends toward the catalyst box in the same group; a plurality of catalyst rods correspond to a plurality of catalyst holes one by one; the catalyst box is slidably connected to the tower body, and the SCR denitration reactor also comprises a lifting drive assembly for driving the catalyst box to move; the catalyst rod is hollow, and an airflow guiding module is arranged in the catalyst rod.

[0007] By adopting the above technical solution, by sequentially arranging several groups of catalytic boxes and catalytic components in the reaction chamber along the direction of gravity, a plurality of catalytic holes are arranged in an array on the catalytic box, one end of the catalytic rod is connected to the base frame, and the other end extends toward the catalytic box, so as to realize the effective distribution of the catalyst and the full contact of the flue gas. Through the airflow guiding module arranged in the catalytic rod, the gas in the tower body is guided to flow into the catalytic rod and then flow out, thereby guiding the smoke particles attached to the pores of the catalytic rod into the internal space of the catalytic rod to clear the blockage of the pores. Furthermore, the catalytic box is slidably connected to the tower body, and the catalytic rod can be inserted into the catalytic hole relatively after sliding to close the catalytic hole, so that the airflow guiding module can generate negative pressure in the catalytic rod to guide the particles in the catalytic box and the catalytic rod to move into the catalytic rod. Thereby, the catalytic hole is unblocked.

[0008] Optionally, the lifting drive assembly includes a driving roller, a driving member and a driving rope; the driving roller is connected to the outside of the tower body through a bracket, one end of the driving rope is connected to the driving roller, and the other end passes through the power chamber to be connected to the catalyst box; the driving member drives the driving roller to rotate.

[0009] By adopting the above technical solution, the driving roller is driven to rotate by the driving member, and the driving cable is driven to move, thereby driving the catalyst box to perform lifting movement, thereby realizing automatic lifting of the catalyst box, and facilitating adjustment of the position of the catalyst assembly when needed.

[0010] Optionally, the lifting drive assembly further includes a plurality of linkage rods; the drive cable is connected to the catalyst box located at the highest layer, and a plurality of linkage rods are connected to the bottom of the catalyst box and extend downward to connect to the remaining catalyst boxes.

[0011] By adopting the above technical solution, the catalyst box at the highest level and the other catalyst boxes are connected by a number of linkage rods to achieve synchronous lifting, ensuring that all catalyst boxes can be lifted and lowered smoothly and synchronously, avoiding equipment damage or reduction in catalytic efficiency due to asynchronous lifting.

[0012] Optionally, a first baffle and a second baffle are arranged on the driving cable at intervals; the first baffle is located outside the tower body, and the second baffle is located inside the power chamber.

[0013] Optionally, the catalytic rod is fixedly connected to the base frame; the interior of the catalytic rod is hollow to form a cavity; the airflow guiding module includes a rotation drive component and an exhaust impeller; the exhaust impeller rotates coaxially inside the catalytic rod; the rotation drive component is connected to the catalytic rod to drive the exhaust impeller to rotate.

[0014] By adopting the above technical solution, the exhaust impeller is driven to rotate in the catalyst rod by the rotating drive assembly, so that the gas flow speed inside the catalyst rod is greater than the gas flow speed outside, thereby forming a pressure difference to guide the airflow into the internal space through the pores of the catalyst rod. At the same time, the airflow is used to drive the particles in the pores into the cavity, thereby preventing the pores from being blocked and dust accumulation from causing a decrease in the catalytic effect.

[0015] Optionally, the rotation drive assembly includes a shell and an impeller cylinder; the shell includes a power chamber and a liquid inlet chamber that are interconnected; the power chamber is a cylindrical hollow structure, and the liquid inlet chamber is arranged to extend outward along the tangent direction of the power chamber; the impeller cylinder is coaxially rotatably connected in the power chamber; a rotating shaft is coaxially arranged on the upper end of the impeller cylinder, and the rotating shaft passes through the outer wall of the power chamber and is coaxially connected to the exhaust impeller; a number of the shells are connected in sequence through a number of liquid pipes; one end of the liquid pipe is connected to the liquid inlet chamber of the shell, and the other end is coaxially connected to the bottom of the adjacent power chamber; liquid medium flows in the liquid pipe and the shell; the SCR denitrification reactor includes a liquid storage tank and a lifting pump; the liquid storage tank is connected to the liquid inlet chamber of the shell at the starting end through a liquid outlet pipe, and the lifting pump is arranged on the liquid outlet pipe; the liquid storage tank is connected to the bottom of the power chamber of the shell at the end through a reflux pipe.

[0016] By adopting the above technical solution, the exhaust impeller is automatically rotated, reducing the tediousness of manual operation. At the same time, the liquid medium as a power source has the advantages of stability, reliability, and environmental protection. At the same time, the liquid can be used to exchange heat in the reaction chamber to control the stability of the reaction chamber.

[0017] Optionally, the water wheel barrel includes a connecting disk, a connecting ring and a plurality of blades; the connecting disk and the connecting ring are arranged in parallel and coaxially; the two ends of the blade are respectively connected to the connecting disk and the connecting ring, and the plurality of blades are arranged circumferentially along the axis of the connecting disk, and the blades are inclined; a liquid outlet is opened at the bottom of the power chamber, and the liquid pipe or the reflux pipe is connected to the liquid outlet; the connecting ring is coaxial with the liquid outlet.

[0018] By adopting the above technical solution, the water wheel cylinder includes a connecting plate, a connecting ring and a plurality of blades, and the blades are arranged at an angle, and the blades are driven to rotate by the flow of the liquid medium. The rotation efficiency is improved, so that the exhaust impeller can rotate more stably and faster. At the same time, the inclined setting of the blades also helps to reduce the resistance of the liquid medium and improve the energy utilization efficiency.

[0019] Optionally, the catalyst rod is hollow; a circular groove is formed at the bottom of the catalyst rod, and the shell is sunk into the groove.

[0020] Optionally, the base frame includes an outer frame and several support beams; the outer frame is connected to the inner periphery of the power chamber; several support beams are connected to each other in parallel within the outer frame; at least two U-shaped support rods are provided at the bottom of the shell, one end of the support rod is connected to the shell, and the other end is connected to the support beam or the outer frame.

[0021] By adopting the above technical solution, the stability and bearing capacity of the base frame are improved, so that the catalytic rods can be more firmly connected to the base frame.

[0022] Optionally, one end of the filter cotton block extends out of the cavity and is in a truncated cone shape.

[0023] In summary, the present application includes at least one of the following beneficial effects: 1. Improved denitration efficiency: By optimizing the settings of the catalyst box and catalyst components, and guiding the particles into the internal cavity to avoid clogging of the catalyst rods, the denitration efficiency of the SCR denitration reactor is significantly improved; 2. Enhanced the stability and reliability of the equipment: Through the reasonable design of the lifting drive assembly, rotating drive assembly and foundation frame and other structures, the stability and reliability of the equipment are enhanced and the blockage of the catalytic pores is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of the present embodiment; Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at point A; Figure 3 It is a schematic diagram of the cross-sectional structure of the catalyst box and the catalyst assembly; Figure 4 is a schematic diagram of the bottom of the catalytic assembly; Figure 5 1. It is a schematic diagram of the cross-sectional structure of the bottom of the catalyst rod; Figure 6 yes Figure 4 Schematic diagram of the enlarged structure at B.

[0025] Description of reference numerals: 11, smoke inlet pipe; 12, guide pipe; 121, smoke guide plate; 13, reaction chamber; 131, through hole; 132, bracket; 14, exhaust pipe; 2, ammonia injection mechanism; 3, catalyst box; 31, catalyst hole; 4, catalyst assembly; 41, base frame; 411, outer frame; 412, support beam; 42, catalyst rod; 421, cavity; 422, groove; 423, drill bit; 4231, connecting column; 5, lifting drive assembly; 51, drive roller; 52, drive member; 53. Drive cable; 531. First baffle; 532. Second baffle; 54. Linkage rod; 6. Rotation drive assembly; 61. Exhaust impeller; 611. Pressure chamber; 612. Exhaust hole; 62. Filter cotton block; 7. Shell; 71. Power chamber; 711. Liquid outlet hole; 72. Liquid inlet chamber; 73. Support rod; 74. Liquid pipe; 8. Impeller cylinder; 81. Connecting plate; 82. Connecting ring; 83. Fan blade; 84. Rotating shaft; 9. Liquid storage tank; 91. Liquid outlet pipe; 92. Reflux pipe; 93. Lifting pump. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 To Attachment Figure 6 This application is described in further detail.

[0027] In the prior art, flue gas mixed with ammonia reacts in a honeycomb-shaped multi-layer catalyst layer. Among them, dust easily accumulates on the upper surface of the catalyst layer. These dust particles may come from fly ash, ultrafine particles or other impurities in the flue gas. After long-term operation, these particles will gradually accumulate on the catalyst surface and in the micropores, causing blockage. These crystalline or solid substances cannot be easily discharged. At the least, they will gradually block the micropores and affect the activity of the catalyst, and at the worst, they will block the catalyst layer.

[0028] Therefore, the present application provides an SCR (selective catalytic reduction) denitration reactor, which is mainly composed of a tower body, an ammonia injection mechanism 2, a catalyst box 3, a catalyst assembly 4, a lifting drive assembly 5, and an airflow guide module.

[0029] Specifically, the tower body is the main structure of the entire SCR denitration reactor, including a smoke inlet pipe 11, a guide pipe 12, a reaction chamber 13 and an exhaust pipe 14 which are interconnected in sequence. The flue gas enters from the smoke inlet pipe 11, passes through the guiding effect of the guide pipe 12, enters the reaction chamber 13 for denitration reaction, and under the action of the catalyst, NOx is reduced to nitrogen and water vapor. Finally, it is discharged from the exhaust pipe 14. Furthermore, a flue gas guide plate 121 is provided in the guide pipe 12 to ensure that the flue gas can smoothly enter the reactor space and be fully mixed with the reducing agent. In addition, a heating device is also provided in this area to heat the flue gas to a temperature range suitable for the catalytic reaction (usually 200°C~450°C). The flue gas flow rate has an important influence on the denitration efficiency. Too fast a flue gas flow rate may cause uneven airflow distribution in the catalyst layer, reducing the denitration efficiency. Therefore, it is necessary to reasonably design the flue cross section and flow rate.

[0030] The ammonia injection mechanism 2 is disposed in the flow guide pipe 12 and is used to inject ammonia gas or ammonia water (or other reducing agents) into the flue gas to provide an ammonia source for the subsequent denitration reaction. The ammonia injection mechanism 2 is prior art and will not be described in detail here.

[0031] Among them, several groups of catalyst boxes 3 and catalyst components 4 are arranged in sequence along the gravity direction in the reaction chamber 13. Each group includes a catalyst box 3 and a catalyst component 4. A plurality of catalyst holes 31 are arranged in an array on the catalyst box 3 to allow the flue gas to pass through and contact the catalyst. Further, the catalyst hole 31 is a circular hole.

[0032] Further, the catalyst box 3 includes three parts: active components, additives and carriers. The active component is the main body of the catalyst that plays a catalytic role and plays a decisive role in the activity of the catalyst. In the SCR denitration catalyst, common active components include metal oxides such as VxOx, WOx, MoOx, FexOx, CuO, CrO, MnOx or mixtures thereof. The additive is an auxiliary component added to the catalyst to improve the performance of the catalyst. According to the role played, the additive can be divided into electronic additives and structural additives. Electronic additives change the surface properties of the catalyst or change the adsorption capacity of the reactant molecules by changing the electronic structure of the main catalyst, thereby reducing the reaction activation energy to improve the reaction efficiency. The structural additive mainly increases the structural stability of the main catalyst and improves the life and stability of the catalyst. The carrier is a substance that supports the active component, which provides an effective surface and a suitable pore structure of the catalyst. In the SCR denitration catalyst, common carriers include TiO2, Al2O3, ZrO2, SiO2, activated carbon (AC), etc. The composition, specific surface area, pore size distribution, surface acidity and alkalinity of the carrier will directly affect the catalytic activity of the catalyst. Specifically, during production, the active components, additives, carriers and other raw materials are fully mixed to ensure that the active components can be evenly loaded on the carrier. During the mixing process, it is also necessary to add an appropriate amount of binders, pore-forming agents and other additives to improve the molding performance and pore structure of the catalyst. The mixed material is filtered to remove impurities, and then the material is formed into the desired catalyst shape, such as honeycomb, plate, etc., by extrusion, molding, etc. The formed catalyst is dried to remove excess moisture. The dried catalyst is placed in a muffle furnace for calcination to further solidify the structure and performance of the catalyst.

[0033] The catalytic assembly 4 includes a base frame 41 and a plurality of catalytic rods 42. One end of the catalytic rod 42 is connected to the base frame 41, and the other end extends toward the same group of catalytic boxes 3, and the plurality of catalytic rods 42 correspond to the plurality of catalytic holes 31. In this way, after the flue gas passes through the catalytic holes 31, it can still fully contact with the catalytic rods 42, thereby improving the denitration efficiency.

[0034] Furthermore, the catalyst rod 42 also includes the same three parts of active components, additives and carriers as the catalyst box 3. During production, the active components, additives, carriers and other raw materials also need to be fully mixed. Then, re-mixing is carried out to improve the molding performance of the catalyst. The material is formed into a cylindrical structure by extrusion, molding, etc., and its diameter corresponds to the diameter of the catalytic hole 31. When the catalyst rod 42 is inserted into the catalytic hole 31, the gap between the two is matched. The formed catalyst rod 42 is dried to remove excess moisture. The dried catalyst rod 42 is placed in a muffle furnace for calcination to further solidify the structure and performance of the catalyst rod 42.

[0035] In order to improve the catalytic efficiency, the present invention also includes an airflow guiding module arranged in the catalytic rod 42, which is used to optimize the airflow movement trajectory in the tower body, so that the airflow enters the interior of the catalytic rod 42 to clear the particles attached to the pores of the catalytic rod 42 and prevent blockage. The airflow guiding module includes a rotating drive component 6 and an exhaust impeller 61. Among them, the exhaust impeller 61 is coaxially connected to the catalytic rod 42 and blows air downward. The rotating drive component 6 includes a shell 7 and an impeller cylinder 8. Through the airflow guiding module arranged in the catalytic rod 42, the gas in the tower body is guided to flow into the catalytic rod 42 and then flow out, thereby guiding the smoke particles attached to the pores of the catalytic rod 42 into the internal space of the catalytic rod 42 to clear the blockage of the pores.

[0036] Specifically, the catalyst rod 42 is fixedly connected to the base frame 41. The inside of the catalyst rod 42 is hollow to form a cavity 421. The exhaust impeller 61 coaxially rotates in the catalyst rod 42. The rotation drive assembly is connected to the catalyst rod 42 to drive the exhaust impeller 61 to rotate. The exhaust impeller 61 is driven to rotate in the catalyst rod 42 by the rotation drive assembly, so that the gas flow speed inside the catalyst rod 42 is greater than the gas flow speed outside, thereby forming a pressure difference to guide the airflow into the cavity 421 through the pores of the catalyst rod 42, and at the same time, the airflow is used to drive the particles in the pores into the cavity 421 to prevent the pores from being blocked and dust accumulation from causing the catalytic effect to decrease.

[0037] Specifically, the shell 7 includes a power chamber 71 and a liquid inlet chamber 72 that are interconnected. The power chamber 71 is a hollow structure, and the liquid inlet chamber 72 is arranged to extend outward along the tangential direction of the power chamber 71. In this way, when the liquid medium enters the power chamber 71 from the liquid inlet chamber 72, an impact force in the tangential direction will be formed, thereby driving the impeller barrel 8 to rotate. The impeller barrel 8 is coaxially connected to the power chamber 71. A rotating shaft 84 is coaxially arranged at the upper end of the impeller barrel 8, and the rotating shaft 84 passes through the outer wall of the power chamber 71 and is coaxially connected to the exhaust impeller 61. When the impeller barrel 8 rotates, it will drive the rotating shaft 84 and the exhaust impeller 61 to rotate together. Several shells 7 are connected in sequence by several liquid pipes 74. One end of the liquid pipe 74 is connected to the liquid inlet chamber 72 of the shell 7, and the other end is connected to the bottom of the power chamber 71 of the adjacent shell 7. In this way, the liquid medium can circulate between multiple shells 7 and liquid pipes 74.

[0038] In order to provide the liquid medium, the present invention further includes a liquid storage tank 9 and a lifting pump 93. The liquid storage tank 9 is connected to the liquid inlet chamber 72 of the housing 7 at the beginning through a liquid outlet pipe 91, and the lifting pump 93 is arranged on the liquid outlet pipe 91, and is used to lift the liquid medium from the liquid storage tank 9 to the liquid inlet chamber 72. At the same time, the liquid storage tank 9 is also connected to the bottom of the power chamber 71 of the housing 7 at the end through a return pipe 92, and is used to receive the liquid medium flowing out of the power chamber 71, so as to realize the recycling of the liquid medium.

[0039] Furthermore, in order to improve the rotation efficiency of the impeller barrel 8, the impeller barrel 8 of the present invention includes a connecting disc 81, a connecting ring 82 and a plurality of blades 83. The connecting disc 81 and the connecting ring 82 are arranged in parallel and coaxially. The two ends of the blade 83 are respectively connected to the connecting disc 81 and the connecting ring 82, and the plurality of blades 83 are arranged circumferentially along the axis of the connecting disc 81, and the blades 83 are arranged obliquely. In this way, when the liquid medium flows out of the liquid outlet 711 flowing out of the bottom of the power chamber 71, it will impact the blades 83 and drive the impeller barrel 8 to rotate. The liquid pipe 74 or the reflux pipe 92 is also connected to the liquid outlet 711 to ensure the smooth flow of the liquid medium. The connecting ring 82 is coaxially arranged with the liquid outlet 711 to further improve the rotation efficiency.

[0040] In order to improve the catalytic effect and reduce the weight, the catalytic rod 42 of the present invention is set as a hollow structure. A circular groove 422 is opened at the bottom of the catalytic rod 42, and the shell 7 is sunk into the groove 422. In this way, there is a space in the catalytic rod 42 to generate negative pressure, and for temporarily storing particulate matter sucked into it, and rotating. The shell 7 is sunk into the groove 422, so that the space where the catalytic rod 42 is located is as flat as possible, so that the gas flow is smoother, the fluid mechanics efficiency is improved, and the contact area between the flue gas and the outer surface of the catalytic rod 42 is fully increased. At the same time, a plurality of air outlet holes 612 connected to the groove 422 are opened at the bottom of the catalytic rod 42 to discharge the internal air.

[0041] In order to further improve the catalytic efficiency and the efficiency of capturing dust accumulation, the catalyst rod 42 of the present invention is detachably connected to a filter cotton block 62 at one end close to the catalyst box 3 of the same group. When it is necessary to clean the dust accumulation in the catalyst rod 42, the filter cotton block 62 can be removed to clean the cavity 421. The space between the filter cotton block 62 and the exhaust impeller 61 is a pressure chamber 611, which is used to provide air flow space. The top of the drill filter cotton block 62 passes through the outside of the catalyst rod 42 and is set to a truncated cone structure. The truncated cone structure can make it easier for the filter cotton block 62 to enter the catalytic hole 31.

[0042] In order to provide stable support for the catalyst assembly 4. The base frame 41 includes an outer frame body 411 and a plurality of support beams 412. The outer frame body 411 is connected to the inner peripheral side of the power chamber 71 to fix the position of the catalyst assembly 4. The plurality of support beams 412 are connected in parallel to each other in the outer frame body 411 to provide support. At the same time, at least two U-shaped support rods 73 are provided at the bottom of the shell 7, one end of the support rod 73 is connected to the shell 7, and the other end is connected to the support beam 412 or the outer frame body 411 to further fix the position of the shell 7.

[0043] Furthermore, the catalyst box 3 is slidably connected to the tower body, and the present invention also includes a lifting drive assembly 5 for driving the catalyst box 3 to move up and down. The lifting drive assembly 5 includes a driving roller 51, a driving member 52 (such as a motor) and a driving cable 53 (such as a wire rope or a chain). The driving roller 51 is connected to the outside of the tower body through the bracket 132, and one end of the driving cable 53 is connected to the driving roller 51, and the other end penetrates into the tower body and is connected to the catalyst box 3. The driving member 52 drives the driving roller 51 to rotate, thereby driving the driving cable 53 and the catalyst box 3 to move up and down.

[0044] Furthermore, in order to simultaneously drive multiple catalytic boxes 3 to move up and down, the lifting drive assembly 5 further includes a plurality of linkage rods 54. The driving cable 53 is connected to the catalytic box 3 at the top layer, and the plurality of linkage rods 54 are connected to the bottom of the catalytic box 3 and extend downward to connect the remaining catalytic boxes 3. In this way, when the catalytic box 3 at the top layer moves up and down, the remaining catalytic boxes 3 will be driven to move up and down synchronously.

[0045] In order to allow the driving cable 53 to pass through the outer wall of the tower body, the tower body is provided with a through hole 131 for the driving cable 53 to slide, which may easily cause internal smoke leakage. In order to increase the sealing performance of the reaction chamber 13, the driving cable 53 of the present invention is provided with a first baffle 531 and a second baffle 532 at intervals. The first baffle 531 and the second baffle 532 are made of rubber or magnetic material. The first baffle 531 is located on the outside of the shell 7. When the driving cable 53 releases the catalyst box 3 and moves downward, the first baffle 531 blocks the through hole 131 from the outside, thereby sealing. The second baffle 532 is located in the power chamber 71. When the driving cable 53 is wound up and pulls the catalyst box 3 to move upward, the second baffle 532 has an internally blocked through hole 131. In this way, the sealing performance of the reaction chamber 13 during the movement of the driving cable 53 can be ensured.

[0046] The implementation principle of an SCR denitration reactor in the embodiment of the present application is: During operation, the flue gas enters the guide pipe 12 from the smoke inlet pipe 11 and enters the reaction chamber 13 after passing through the ammonia injected by the ammonia injection mechanism 2. The flue gas fully undergoes a denitration reaction when passing through the catalytic holes 31 and when contacting the catalytic rods 42. The flue gas after the reaction is discharged from the exhaust pipe.

[0047] Periodically, the catalyst box 3 and the catalyst assembly 4 are driven to descend to the appropriate position through the lifting drive assembly 5, so that the catalyst rod 42 corresponds to the catalyst hole 31 one by one, and the catalyst rod 42 is inserted into the catalyst hole 31. At the same time, the liquid medium of the rotating drive assembly 6 enters the liquid inlet chamber 72 from the liquid storage tank 9 under the action of the lifting pump 93 and impacts the impeller cylinder 8 to drive the exhaust impeller 61 to rotate. The gas in the tower body is guided to flow into the catalyst rod and then out, thereby guiding the smoke particles attached to the pores of the catalyst rod to enter the internal space of the catalyst rod to clean the pore blockage. At the same time, by adjusting the working parameters of the lifting drive assembly 5 and the rotating drive assembly 6, the catalytic efficiency and cleaning effect can be optimized.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An SCR denitration reactor, comprising a tower body and an ammonia injection mechanism (2), the tower body comprising a smoke inlet pipe (11), a flow guide pipe (12), a reaction chamber (13) and an exhaust pipe (14) which are arranged in sequence and are interconnected; the ammonia injection mechanism (2) is arranged in the flow guide pipe (12); Features: It also comprises a catalytic box (3) and a catalytic assembly (4); a single catalytic box (3) and a single catalytic assembly (4) form a group, and a plurality of groups are sequentially arranged in the reaction chamber (13) along the gravity direction; a plurality of catalytic holes (31) are arranged in an array on the catalytic box (3); the catalytic assembly (4) comprises a base frame (41) and a plurality of catalytic rods (42); one end of the catalytic rods (42) is connected to the base frame (41), and the other end extends in the direction of the catalytic box (3) in the same group; the plurality of catalytic rods (42) correspond to the plurality of catalytic holes (31) in a one-to-one manner; The catalyst box (3) is slidably connected to the tower body, and the SCR denitration reactor further comprises a lifting drive assembly (5) for driving the catalyst box (3) to move; The catalytic rod (42) is hollow, and an airflow guiding module is arranged in the catalytic rod (42).

2. The SCR denitration reactor according to claim 1, characterized in that: The lifting drive assembly (5) comprises a driving roller (51), a driving member (52) and a driving cable (53); the driving roller (51) is connected to the outside of the tower body via a bracket (132); one end of the driving cable (53) is connected to the driving roller (51), and the other end penetrates into the tower body and is connected to the catalyst box (3); the driving member (52) drives the driving roller (51) to rotate.

3. The SCR denitration reactor according to claim 2, characterized in that: The lifting drive assembly (5) further comprises a plurality of linkage rods (54); the driving rope (53) is connected to the catalyst box (3) located at the highest level, and a plurality of linkage rods (54) are connected to the bottom of the catalyst box (3) and extend downward to connect to the remaining catalyst boxes (3).

4. The SCR denitration reactor according to claim 2, characterized in that: A first baffle (531) and a second baffle (532) are arranged on the driving rope (53) at intervals; the first baffle (531) is located outside the tower body, and the second baffle (532) is located inside the power chamber (71).

5. The SCR denitration reactor according to any one of claims 1 to 4, characterized in that: The catalytic rod (42) is fixedly connected to the base frame (41); the interior of the catalytic rod (42) is hollow to form a cavity (421); the airflow guiding module comprises a rotation drive component (6) and an exhaust impeller (61); the exhaust impeller (61) rotates coaxially inside the catalytic rod (42); and the rotation drive component (6) is connected to the catalytic rod (42) to drive the exhaust impeller (61) to rotate.

6. The SCR denitration reactor according to claim 5, characterized in that: The rotary drive assembly (6) comprises a housing (7) and an impeller cylinder (8); the housing (7) comprises a power chamber (71) and a liquid inlet chamber (72) which are interconnected; the power chamber (71) is a cylindrical hollow structure, and the liquid inlet chamber (72) is arranged to extend outwardly along a tangential direction of the power chamber (71); the impeller cylinder (8) is coaxially rotatably connected to the power chamber (71); a rotating shaft (84) is coaxially arranged at the upper end of the impeller cylinder (8), and the rotating shaft (84) passes through the outer wall of the power chamber (71) and is coaxially connected to the exhaust impeller (61); The plurality of shells (7) are connected in sequence via a plurality of liquid pipes (74); one end of the liquid pipe (74) is connected to the liquid inlet chamber (72) of the shell (7), and the other end is coaxially connected to the bottom of the adjacent power chamber (71); a liquid medium flows in the liquid pipe (74) and the shell (7); the SCR denitration reactor comprises a liquid storage tank (9) and a lifting pump (93); the liquid storage tank (9) is connected to the liquid inlet chamber (72) of the shell (7) at the beginning via a liquid outlet pipe (91), and the lifting pump (93) is arranged on the liquid outlet pipe (91); the liquid storage tank (9) is connected to the bottom of the power chamber (71) of the shell (7) at the end via a reflux pipe (92).

7. The SCR denitration reactor according to claim 6, characterized in that: The water wheel barrel comprises a connecting disk (81), a connecting ring (82) and a plurality of blades (83); the connecting disk (81) and the connecting ring (82) are arranged in parallel and coaxially; two ends of the blades (83) are respectively connected to the connecting disk (81) and the connecting ring (82); the plurality of blades (83) are arranged circumferentially along the axis of the connecting disk (81), and the blades (83) are arranged obliquely; a liquid outlet hole (711) is provided at the bottom of the power chamber (71); the liquid pipe (74) or the return pipe (92) is connected to the liquid outlet hole (711); and the connecting ring (82) is coaxial with the liquid outlet hole (711).

8. The SCR denitration reactor according to claim 6, characterized in that: The cavity (421) in the catalytic rod (42) passes through the top; a groove (422) is provided at the bottom of the catalytic rod (42), and the housing (7) is sunk into the groove (422); and a filter cotton block (62) is interference-fitted in the cavity (421).

9. The SCR denitration reactor according to claim 8, characterized in that: The base frame (41) comprises an outer frame body (411) and a plurality of support beams (412); the outer frame body (411) is connected to the inner peripheral side of the power chamber (71); the plurality of support beams (412) are connected in parallel to each other inside the outer frame body (411); at least two U-shaped support rods (73) are provided at the bottom of the shell (7); one end of the support rod (73) is connected to the shell (7), and the other end is connected to the support beam (412) or the outer frame body (411).

10. The SCR denitration reactor according to claim 8, characterized in that: One end of the filter cotton block (62) extends out of the cavity (421) and is in the shape of a truncated cone.

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