Direct-injection ammonia SCR (Selective Catalytic Reduction) denitration device

Abstract

The utility model relates to the technical field of flue gas denitrification, in particular to an ammonia direct injection SCR (Selective Catalytic Reduction) denitrification device which comprises a preheater, a filter plate, a mixing plate, a main flow pipe, a cleaning structure and a rotating structure, one side of the preheater is fixedly connected with a filter chamber, one side of the filter chamber is fixedly connected with a denitrification tower, the filter plate is rotatably connected in the filter chamber, and the mixing plate is fixedly connected with the denitrification tower. A communicating pipe is mounted at the top of the filter plate, multiple groups of mixing plates are fixedly connected to one side of the denitration tower at equal intervals, catalytic plates are fixedly connected to the other side of the denitration tower at equal intervals, a main flow pipe is fixedly connected to the interior of the denitration tower, multiple groups of shunt pipes are rotatably connected to one side of the main flow pipe at equal intervals, and a cleaning structure for cleaning the filter plate is mounted in the filter chamber; according to the direct-injection ammonia SCR denitration device disclosed by the utility model, solid particles in flue gas are effectively filtered, the automatic cleaning of the filter plate is realized, and the mixing degree of ammonia water and the flue gas is improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to a direct injection ammonia SCR denitrification device. Background Technology

[0002] SCR denitrification devices convert nitrogen oxides in flue gas into harmless nitrogen and water vapor through a highly efficient catalytic reduction reaction. Since NOx is one of the air pollutants that can cause environmental problems such as acid rain and photochemical smog, this function of SCR denitrification devices is of great significance for improving environmental quality. SCR denitrification devices have wide applicability and can be applied to a variety of industrial fields, including but not limited to small boilers, lithium battery industry, sintering machines, internal combustion engine units, rubber industry, petrochemical industry, refining industry, boiler flue gas, kiln flue gas, etc.

[0003] Existing SCR denitrification devices typically heat the flue gas first through a preheater, then introduce the flue gas into the denitrification tower. Ammonia water is injected into the tower, and a catalyst is used to convert nitrogen oxides into nitrogen and water. However, existing SCR denitrification devices still have the following shortcomings:

[0004] I. The problem of solid particles in flue gas:

[0005] Flue gas often contains a certain amount of solid particles, such as fly ash and soot. These solid particles not only wear down the catalyst and reduce its service life, but more importantly, they also deposit on the catalyst surface, forming a coating layer, which leads to catalyst poisoning, reduces its activity, or even causes complete failure. Catalyst poisoning will seriously affect denitrification efficiency, increase operating costs, and may even cause secondary pollution to the environment.

[0006] II. Problems with ammonia injection through the distribution pipe:

[0007] In traditional direct-injection ammonia SCR denitrification units, the diversion pipe can usually only spray ammonia water in one direction. This unidirectional injection method has the problem of insufficient mixing between ammonia water and flue gas. Because the flow of flue gas in the denitrification tower is complex and variable, it is difficult to ensure that ammonia water can be mixed evenly and fully with the flue gas by unidirectional injection. This will not only reduce the denitrification efficiency, but also increase the risk of ammonia escape, that is, the ammonia water that has not participated in the reaction is discharged with the flue gas, causing environmental pollution.

[0008] Therefore, it is necessary to provide a new direct-injection ammonia SCR denitrification device to solve the above-mentioned technical problems. Utility Model Content

[0009] To solve the above-mentioned technical problems, this utility model provides a direct injection ammonia SCR denitrification device.

[0010] The direct-injection ammonia SCR denitrification device provided by this utility model includes: a preheater, a filter plate, a mixing plate, a main flow pipe, a cleaning structure, and a rotating structure. A filter chamber is fixedly connected to one side of the preheater, and a denitrification tower is fixedly connected to one side of the filter chamber. A filter plate is rotatably connected inside the filter chamber, and a connecting pipe is installed on the top of the filter plate. Multiple sets of mixing plates are fixedly connected at equal intervals to one side of the denitrification tower, and catalytic plates are fixedly connected at equal intervals to the other side of the denitrification tower. A main flow pipe is fixedly connected inside the denitrification tower, and multiple diversion pipes are rotatably connected at equal intervals to one side of the main flow pipe. A cleaning structure for cleaning the filter plate is installed inside the filter chamber, and a rotating structure for driving the diversion pipes to reciprocate is installed inside the denitrification tower.

[0011] Preferably, the cleaning structure includes: a first worm gear, a first worm wheel, a high-pressure spray column, a driving bevel gear, a transmission bevel gear, a rotating rod, a driven bevel gear, a brush roller, and a reciprocating screw. The first worm gear is rotatably connected inside the filter chamber. The first worm wheel is fixedly connected to the axis of the filter plate and meshes with the first worm gear. A high-pressure spray column is installed inside the filter chamber above the first worm gear. A driving bevel gear is fixedly connected to one end of the first worm gear. A transmission rod is rotatably connected inside the filter chamber. Both ends of the transmission rod are fixedly connected with transmission bevel gears. A rotating rod is rotatably connected inside the filter chamber. A driven bevel gear is fixedly connected to the outer wall of one end of the rotating rod. A brush roller is slidably connected to the outer wall of the middle part of the rotating rod. A reciprocating screw is fitted to the inner wall of the end of the brush roller away from the rotating rod. The reciprocating screw is fixedly connected to the filter chamber.

[0012] Preferably, the rotating structure includes: a driving pulley, a driven pulley, a driving gear, a sector gear ring, a sector gear, a second worm, and a second worm wheel. One end of the first worm is fixedly connected to the driving pulley, and the driven pulley is rotatably connected to one side of the denitrification tower. The driving pulley and the driven pulley are connected by a belt drive. One side of the driven pulley is fixedly connected to the driving gear, and the sector gear ring is rotatably connected to one side of the denitrification tower. A sector gear is fixedly connected to the axis of the sector gear ring. The driving gear, the sector gear ring, and the sector gear are intermittently and alternately meshed. The side of the sector gear ring away from the driving gear is fixedly connected to the second worm. A second worm wheel is fixedly connected to the outer wall of one end of the diversion pipe.

[0013] Preferably, a motor is fixedly connected to the filter chamber, and the output end of the motor is fixedly connected to the first worm gear.

[0014] Preferably, the teeth of the sector ring and the sector gear extend in the circumferential direction, and the central angle covered by the teeth is 180 degrees.

[0015] Preferably, the connecting pipe and the filter plate are sealed, and sealing strips are symmetrically fixed at the connection between the connecting pipe and the filter plate. The width of the sealing strips is greater than the diameter of the filter holes opened in the filter plate.

[0016] Preferably, multiple sets of bristles are fixedly connected at equal intervals on the outer wall of the brush roller, an external spline is provided on the outer wall of the rotating rod, and an internal spline is provided on the inner wall of the brush roller, with the external spline sliding within the internal spline.

[0017] Preferably, a water outlet is fixedly connected to the bottom of the filter chamber.

[0018] Compared with related technologies, the direct injection ammonia SCR denitrification device provided by this utility model has the following beneficial effects:

[0019] Effectively filters solid particles in flue gas:

[0020] This invention adds a filter chamber after the preheater, and a filter plate is rotatably connected inside the filter chamber. Through the rotation of the filter plate, solid particles such as fly ash and soot in the flue gas can be effectively intercepted and removed. This design not only extends the service life of the catalyst and prevents the catalyst from being poisoned by solid particle deposition, but also significantly improves the denitrification efficiency, reduces operating costs, and effectively avoids secondary environmental pollution that may be caused by catalyst failure.

[0021] Automatic cleaning of the filter plates has been achieved.

[0022] This utility model incorporates a cleaning structure within the filter chamber. A motor drives the first worm gear to rotate, which in turn drives the brush roller and bristles to clean the filter plate. This design effectively prevents the filter plate from clogging due to long-term operation, ensuring its continuous and efficient filtration performance. At the same time, the high-pressure spray column can also rinse the filter plate, further improving the cleaning effect.

[0023] Improve the mixing degree of ammonia water and flue gas:

[0024] This invention incorporates a reciprocating rotating diversion pipe inside the denitrification tower, driven by a rotating structure. This design enhances the mixing degree between ammonia water and flue gas. The auxiliary mixing plate further facilitates more thorough mixing, solving the problem of insufficient mixing between ammonia water and flue gas caused by unidirectional injection in traditional direct-injection ammonia SCR denitrification devices. This improvement not only increases denitrification efficiency but also significantly reduces the risk of ammonia escape, minimizing environmental pollution caused by unreacted ammonia water being discharged with the flue gas. Attached Figure Description

[0025] Figure 1 A schematic diagram of the direct-injection ammonia SCR denitrification device provided by this utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the denitrification tower shown;

[0027] Figure 3 for Figure 2 The diagram shows the internal structure of the filter chamber.

[0028] Figure 4 for Figure 3 The diagram shows the structure of the driving bevel gear;

[0029] Figure 5 for Figure 3 The diagram shows the structure of the other side of the filter plate.

[0030] Figure 6 for Figure 2 The diagram shows the structure of the driven pulley.

[0031] Labels in the diagram: 1. Preheater; 2. Filter chamber; 3. Denitrification tower; 4. Filter plate; 5. Connecting pipe; 6. Mixing plate; 7. Catalytic plate; 8. Main stream pipe; 9. Diverter pipe; 10. First worm gear; 11. First worm wheel; 12. High-pressure spray column; 13. Driving bevel gear; 14. Transmission bevel gear; 15. Rotating rod; 16. Driven bevel gear; 17. Brush roller; 18. Reciprocating screw; 19. Driving pulley; 20. Driven pulley; 21. Driving gear; 22. Sector gear ring; 23. Sector gear; 24. Second worm gear; 25. Second worm wheel; 26. Transmission rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0033] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0034] Please see Figures 1 to 6 A direct-injection ammonia SCR denitrification device includes: a preheater 1, a filter plate 4, a mixing plate 6, a main flow pipe 8, a cleaning structure, and a rotating structure. A filter chamber 2 is fixedly connected to one side of the preheater 1, and a denitrification tower 3 is fixedly connected to one side of the filter chamber 2. The filter plate 4 is rotatably connected inside the filter chamber 2, and a connecting pipe 5 is installed on the top of the filter plate 4. Multiple sets of mixing plates 6 are fixedly connected at equal intervals on one side of the denitrification tower 3, and catalytic plates 7 are fixedly connected at equal intervals on the other side of the denitrification tower 3. The main flow pipe 8 is fixedly connected inside the denitrification tower 3, and multiple diversion pipes 9 are rotatably connected at equal intervals on one side of the main flow pipe 8. A cleaning structure for cleaning the filter plate 4 is installed inside the filter chamber 2, and a rotating structure for driving the diversion pipes 9 to reciprocate is installed inside the denitrification tower 3. The connecting pipe 5 is sealed to the filter plate 4, and sealing strips are symmetrically fixedly connected at the connection between the connecting pipe 5 and the filter plate 4. The width of the sealing strips is greater than the diameter of the filter holes opened in the filter plate 4.

[0035] It should be noted that the width of the sealing strip is greater than the diameter of the filter holes opened in the filter plate 4 to prevent air leakage from the connecting pipe 5 when the filter plate 4 rotates.

[0036] Please see Figures 2 to 5 The cleaning structure includes: a first worm gear 10, a first worm wheel 11, a high-pressure spray column 12, a driving bevel gear 13, a transmission bevel gear 14, a rotating rod 15, a driven bevel gear 16, a brush roller 17, and a reciprocating screw 18. The first worm gear 10 is rotatably connected inside the filter chamber 2. The first worm wheel 11 is fixedly connected to the axis of the filter plate 4, and the first worm wheel 11 meshes with the first worm gear 10. A high-pressure spray column 12 is installed above the first worm gear 10 inside the filter chamber 2. One end of the first worm gear 10 is fixedly connected to the driving bevel gear 13. A transmission rod 26 is rotatably connected inside the filter chamber 2. Each end is fixedly connected to a transmission bevel gear 14. Inside the filter chamber 2, a rotating rod 15 is rotatably connected. One end of the rotating rod 15 is fixedly connected to a driven bevel gear 16. A brush roller 17 is slidably connected to the outer wall of the middle part of the rotating rod 15. A reciprocating screw 18 is fitted to the inner wall of the end of the brush roller 17 away from the rotating rod 15. The reciprocating screw 18 is fixedly connected to the filter chamber 2. A motor is fixedly connected inside the filter chamber 2. The output end of the motor is fixedly connected to the first worm gear 10. Multiple sets of bristles are fixedly connected at equal intervals to the outer wall of the brush roller 17. An external spline is provided on the outer wall of the rotating rod 15. An internal spline is provided on the inner wall of the brush roller 17. The external spline slides within the internal spline.

[0037] It should be noted that the design of the external and internal splines enables the brush roller 17 to rotate synchronously with the rotation of the rotating rod 15. In conjunction with the use of the reciprocating screw 18, the brush roller 17 can perform horizontal reciprocating motion while rotating.

[0038] Please see Figure 2 , Figure 3 and Figure 6 The rotating structure includes: a driving pulley 19, a driven pulley 20, a driving gear 21, a sector gear ring 22, a sector gear 23, a second worm 24, and a second worm wheel 25. One end of the first worm 10 is fixedly connected to the driving pulley 19. The driven pulley 20 is rotatably connected to one side of the denitrification tower 3. The driving pulley 19 and the driven pulley 20 are connected by belt drive. The driving gear 21 is fixedly connected to one side of the driven pulley 20. The sector gear ring 22 is rotatably connected to one side of the denitrification tower 3. The sector gear 23 is fixedly connected to the axis of the sector gear ring 22. The driving gear 21 is intermittently meshed with the sector gear ring 22 and the sector gear 23. The side of the sector gear ring 22 away from the driving gear 21 is fixedly connected to the second worm 24. The outer wall of one end of the diversion pipe 9 is fixedly connected to the second worm wheel 25. The teeth of the sector gear ring 22 and the sector gear 23 extend in the circumferential direction, and the central angle covered by the teeth is 180 degrees.

[0039] It should be noted that the central angle covered by the teeth of the sector gear ring 22 and the sector gear 23 is 180 degrees. The driving gear 21 is only engaged with either the sector gear ring 22 or the sector gear 23 at any given time. When the driving gear 21 disengages from the sector gear ring 22, the driving gear 21 engages with the sector gear 23. When the driving gear 21 disengages from the sector gear 23, the driving gear 21 engages with the sector gear ring 22.

[0040] The working principle of the direct-injection ammonia SCR denitrification device provided by this utility model is as follows:

[0041] Filtering stage:

[0042] The flue gas first enters the preheater 1 from the top. The preheater 1 heats the flue gas to a temperature range suitable for the catalytic reduction reaction. The preheated flue gas then enters the filter chamber 2. In the filter chamber 2, the flue gas is purified by rotating filter plates 4. The filter plates 4 have densely packed filter holes that allow the flue gas to pass through while effectively intercepting solid particles in the flue gas, such as fly ash and soot, thereby preventing these particles from causing wear or poisoning to the subsequent catalyst. The rotation of the filter plates 4 is driven by a motor. After the motor starts, its output end drives the first worm gear 10 to rotate. Since the first worm gear 10 is meshed with the first worm wheel 11 at the shaft of the filter plates 4, the rotation of the first worm gear 10 will drive the filter plates 4 to rotate synchronously. The sealing strip between the connecting pipe 5 and the filter plates 4 ensures airtightness and prevents air leakage caused by the rotation of the filter plates 4.

[0043] Mixing phase:

[0044] The flue gas entering the denitrification tower 3 encounters ammonia water injected from the main pipe 8 through the diversion pipe 9. The diversion pipe 9 rotates back and forth under the action of the rotating structure, so that the ammonia water can be evenly and fully mixed with the flue gas. During the injection process, the motor starts and drives the drive pulley 19 to rotate. The drive pulley 19 drives the driven pulley 20 to rotate through the belt. The driven pulley 20 drives the drive gear 21 to rotate. The drive gear 21 drives the sector gear ring 22 and sector gear 23 connected to it to rotate. When the drive gear 21 meshes with the sector gear ring 22, the sector gear ring 22 drives the sector gear 23 and the second worm gear 24 to rotate in the same direction as the drive gear 21. When the drive gear 21 meshes with the sector gear 23, the sector gear 23 drives the sector gear ring 22 and the second worm gear 24 to rotate in the opposite direction to the drive gear 21. The second worm gear 25 drives the diversion pipe 9 to rotate back and forth by driving the second worm gear 25 connected to it to rotate back and forth. After the flue gas comes into contact with the ammonia water, it rises and is mixed again by the mixing plate 6.

[0045] Catalytic reduction stage:

[0046] The uniformly mixed flue gas enters the catalytic plate 7 area. Under the action of the catalyst, the nitrogen oxides (NOx) in the flue gas undergo a catalytic reduction reaction with ammonia water to generate harmless nitrogen gas and water vapor. The nitrogen gas and water vapor are discharged from the bottom of the denitrification tower 3.

[0047] Cleaning and maintenance phase:

[0048] When the motor drives the filter plate 4 to rotate through the first worm 10 and the first worm wheel 11, the high-pressure spray column 12 sprays high-pressure water evenly onto the surface of the rotating filter plate through the high-pressure nozzle to rinse the filter plate 4 and remove solid particles attached to the filter plate 4. The first worm 10 drives the active bevel gear 13 to rotate, and the active bevel gear 13 drives the transmission bevel gear 14 connected to it to rotate. The transmission bevel gear 14 drives the driven bevel gear 16 to rotate by driving the transmission rod 26 and another transmission bevel gear to rotate. The driven bevel gear 16 drives the rotating rod 15 to rotate. The rotating rod 15 drives the brush roller 17 to rotate by sliding the external spline on the internal spline opened in the inner wall of the brush roller 17. During the rotation of the brush roller 17, the end of the brush roller 17 close to the reciprocating screw 18 slides horizontally along the reciprocating screw 18 as the brush roller 17 rotates, further improving the cleaning effect. The water and solid particle mixture generated during the cleaning process is discharged from the water outlet at the bottom of the filter chamber 2.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A direct injection ammonia SCR De-NOx device, characterized by, The utility model relates to a denitration device, including: Preheater (1), preheater (1) one side fixedly connected with filter chamber (2), filter chamber (2) one side fixedly connected with denitration tower (3); Filter plate (4), filter chamber (2) rotatably connected with filter plate (4), filter plate (4) top installation has the communicating pipe (5), and the communicating pipe (5) both ends are fixedly connected with preheater (1) and denitration tower (3) respectively; Mixing plate (6), denitration tower (3) one side equidistant fixedly connected with multiple mixing plate (6), and the other side of denitration tower (3) equidistant fixedly connected with catalytic plate (7); Main stream pipe (8), denitration tower (3) inside fixedly connected with main stream pipe (8), and one side of main stream pipe (8) equidistant rotatably connected with multiple branch pipes (9); Cleaning structure, filter chamber (2) inside installation is used for cleaning filter plate (4) of cleaning structure; Rotary structure, denitration tower (3) inside installation is used for driving the rotary structure of branch pipe (9) reciprocating rotation.

2. The direct injection ammonia SCR De-NOx device according to claim 1, characterized in that, Cleaning structure includes: first worm (10), first worm wheel (11), high pressure spray column (12), driving bevel gear (13), transmission bevel gear (14), rotating rod (15), driven bevel gear (16), brush roller (17) and reciprocating wire rod (18), filter chamber (2) rotatably connected with first worm (10), and the axle of filter plate (4) fixedly connected with first worm wheel (11), and first worm wheel (11) is engaged with first worm (10) connection, and high pressure spray column (12) is fixedly connected with the first worm (10) top in filter chamber (2), and one end of first worm (10) is fixedly connected with driving bevel gear (13), and transmission rod (26) is rotatably connected in filter chamber (2), and both ends of transmission rod (26) are fixedly connected with transmission bevel gear (14), and rotating rod (15) is rotatably connected in filter chamber (2), and the outer wall of one end of rotating rod (15) is fixedly connected with driven bevel gear (16), and the outer wall of rotating rod (15) middle part is slidably connected with brush roller (17), and the inner wall of the one end of brush roller (17) away from rotating rod (15) is connected with reciprocating wire rod (18) with cooperation, and reciprocating wire rod (18) is fixedly connected with filter chamber (2).

3. The direct injection ammonia SCR De-NOx device of claim 1, wherein, The rotating structure comprises a driving pulley (19), a driven pulley (20), a driving gear (21), a sector gear ring (22), a sector gear (23), a second worm (24) and a second worm wheel (25), one end of the first worm (10) is fixedly connected with the driving pulley (19), one side of the denitration tower (3) is rotatably connected with the driven pulley (20), the driving pulley (19) and the driven pulley (20) are drivingly connected through a belt, one side of the driven pulley (20) is fixedly connected with the driving gear (21), one side of the denitration tower (3) is rotatably connected with the sector gear ring (22), the sector gear ring (22) is fixedly connected with the sector gear (23) at the axis center, the driving gear (21) is intermittently and alternately connected with the sector gear ring (22) and the sector gear (23), one side of the sector gear ring (22) away from the driving gear (21) is fixedly connected with the second worm (24), and the outer wall of one end of the shunt pipe (9) is fixedly connected with the second worm wheel (25).

4. The direct injection ammonia SCR De-NOx device of claim 2, wherein, The motor is fixedly connected in the filter chamber (2), and the output end of the motor is fixedly connected with the first worm (10).

5. The direct injection ammonia SCR De-NOx device of claim 3, wherein, The teeth of the sector gear ring (22) and the sector gear (23) extend in the circumferential direction, and the central angle covered by the teeth is 180 degrees.

6. The direct injection ammonia SCR DeNOx device of claim 1, wherein, The communication pipe (5) is in airtight connection with the filter plate (4), the connection position of the communication pipe (5) and the filter plate (4) is fixedly connected with a sealing rubber strip in a symmetrical mode, and the width of the sealing rubber strip is greater than the diameter of the filter hole of the filter plate (4).

7. The direct injection ammonia SCR De-NOx device of claim 2, wherein, The outer wall of the brush roller (17) is fixedly connected with a plurality of groups of brush hairs at equal intervals, the outer wall of the rotating rod (15) is provided with an external spline, the inner wall of the brush roller (17) is provided with an internal spline, and the external spline slides in the internal spline.

8. The direct injection ammonia SCR DeNOx device of claim 1, wherein, The bottom of the filter chamber (2) is fixedly connected with a water outlet.

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