A pre-dust removal structure for a dusty flue gas SCR denitrification system

Abstract

The present application relates to the technical field related to denitrification and dust removal, and discloses a pre-dust removal structure of a dust-containing flue gas SCR denitrification system. In order to solve the problem that filter plates are prone to clogging when working for a long time, multiple layers of filter plates are arranged in the dust removal bin, and the gaps between the multiple filter plates are reduced successively to achieve layered filtration; a recoil pipe is arranged between the filter plates, and the recoil blades in the recoil pipe make the airflow in the recoil chamber and the airflow between the filter plates flow in opposite directions, and the recoil airflow generated in the recoil chamber is used to recoil the filter holes on the filter plates to achieve airflow clearing and blocking of the filter holes, and the particles filtered by the filter plates will enter between the two filter plates, and the recoil chamber will reversely impact the filtered smoke particles on the filter plates again. On the one hand, the dust particles are output to the vicinity of the slag discharge cover for collection through the transmission of the recoil pipe, and on the other hand, the smoke particles reversely impact the filter plates to make the smoke particles hit the particles blocked in the filter holes, finally achieving the effect of recoil clearing and blocking of the airflow and smoke particles.

Description

Technical Field

[0001] The present application relates to the technical field related to denitrification and dust removal, and in particular to a pre-dust removal structure of a dust-containing flue gas SCR denitrification system. Background Art

[0002] The dusty flue gas SCR denitrification system adopts the principle of selective catalytic reduction (SCR). Under the action of the catalyst, the nitrogen oxides (NOX) in the flue gas are converted into non-toxic nitrogen (N2) and water (H2O) through the reducing agent. This system is particularly suitable for treating flue gas containing a large amount of dust, because it can treat particulate matter in the flue gas while denitrifying.

[0003] Since smoke contains a large amount of dust particles, if such smoke is directly transported to the SCR reactor without being treated, these tiny smoke particles will inevitably accumulate on the catalyst plate. As time goes by, the accumulated particles gradually increase, which will significantly reduce the effective contact area between the catalyst plate and the flue gas. This will not only reduce the working efficiency of the catalyst and affect the purification effect of the flue gas, but may also damage the catalyst plate itself.

[0004] In order to solve this problem, the current common practice is to add a filter plate in front of the reactor to pre-filter the particulate matter in the flue gas to reduce the number of smoke particles entering the catalyst plate. This method can indeed effectively reduce the impact of particulate matter on the catalyst plate to a certain extent. However, in actual applications, as the filtration time increases, the particulate matter on the filter plate gradually accumulates, which can easily cause the filter plate to be blocked. This will not only weaken the filtering effect of the filter plate, resulting in poor filtration, but may also increase the operating resistance of the system and even threaten the stable operation of the entire denitrification system. Summary of the invention

[0005] The present application proposes a pre-dust removal structure for a dusty flue gas SCR denitrification system, which has the advantages of clearing blockages by smoke dust particles and airflow recoil, and is used to solve the problem in the above background technology that filter plates are prone to blockage when working for a long time.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a pre-dust removal structure of a dust-containing flue gas SCR denitrification system, comprising: an air intake pipe, one end of which is connected to a flange plate, and the other end is fixedly connected to a dust removal pipe, and the dust removal pipe is arranged tilted downward; a drive motor is fixed to the outside of the air intake pipe, and a rotating shaft is fixedly connected to an air intake fan blade located in the air intake pipe; a slag discharge cover is threadedly connected to the end of the dust removal pipe; a dust removal bin, the bottom of which is fixed to the middle of the dust removal pipe, and the top is connected to the denitrification reactor through a smoke conveying pipe, and the denitrification reactor is installed on one side of the dust removal bin through a bracket; an ammonia injection grid is installed in the smoke conveying pipe and is located above the dust removal bin; a rectifier grid is installed inside the denitrification reactor; a catalyst plate is installed inside the denitrification reactor and is located below the rectifier grid.

[0007] Furthermore, a filter plate is movably installed inside the dust removal bin, and filter holes are opened on the filter plate. There are multiple filter plates, and the apertures of the multiple filter plates decrease from bottom to top.

[0008] Furthermore, it also includes: a power shaft, which is coaxially fixed with the rotating shaft of the driving motor, and the power shaft is located inside the dust removal bin, and the filter plate is coaxially fixed with the power shaft; a middle partition cylinder, which is fixed inside the dust removal bin and located between the two filter plates, and is fixedly connected to an air supply pipe on the inside; a recoil pipe, which is fixed to the end of the air supply pipe, has a recoil chamber inside, a driving gear movably installed on the outside, and is fixedly connected to a fan frame on the inside, and the shaft end of the driving gear extends into the inside of the fan frame; a recoil fan blade, which is movably installed on the surface of the fan frame, and the shaft end of the driving gear drives the recoil fan blade to rotate through the fan frame; a gear ring, which is fixed to the surface of the filter plate and meshes with the driving gear.

[0009] Furthermore, a needle roller located on the surface of the filter plate is movably installed inside the dust removal bin.

[0010] Furthermore, it also includes: a guide frame, which is fixed on the surface of the filter plate and is located in the space outside the middle partition tube and inside the dust removal bin, and the air supply pipe enables the space to communicate with the recoil chamber; a dirt storage strip, which is fixed on the top of the guide frame, and the top is fixedly connected to a connecting block, and the top of the connecting block is fixedly connected to a guide ring.

[0011] Furthermore, a tube cover is sleeved on the top of the recoil tube, and a slope is formed on the bottom of the tube cover.

[0012] Furthermore, it also includes: a guide tube, which is fixed to the back of the guide frame, and the back of the connecting block is sleeved on the guide tube; a detection column head, which is movably installed on the inner side of the recoil tube and is located below the recoil fan blade; a detection push rod, which is hinged on the outer side of the recoil tube and movably connected to one end of the detection column head, and the top is located below the tube cover; a pulley, which is sleeved on the top of the middle partition tube, the bottom of which is movably installed on the top of the guide ring, and the top is connected to the detection push rod through a pull rope.

[0013] Furthermore, the dirt storage strip is a flexible rubber strip.

[0014] The present invention has the following beneficial effects:

[0015] The present application provides a pre-dust removal structure for a dusty flue gas SCR denitrification system, which realizes layered filtration of smoke particles by arranging multiple layers of filter plates inside the dust removal bin. The pore sizes between these filter plates decrease in sequence, which not only ensures the filtration effect, but also effectively reduces the pressure on the single-layer filter plate, thereby extending the service life of the filter plate.

[0016] Recoil pipes are set between the multiple filter plates. Recoil blades are installed inside these recoil pipes. The rotating recoil blades will guide the airflow in the recoil chamber to generate an airflow in the opposite direction to the flow between the filter plates. This reverse airflow will strongly recoil the filter holes on the filter plates, effectively removing the smoke and dust particles blocked in the filter holes, achieving the purpose of clearing the filter holes with airflow.

[0017] The smoke particles filtered by the filter plate will fall into the space between two adjacent filter plates. At this time, the airflow in the recoil chamber will impact the filtered smoke particles back onto the filter plate. This reverse impact not only helps to transfer the dust particles through the recoil pipe to the vicinity of the slag discharge cover for collection, but also uses the impact force of the smoke particles themselves to perform secondary cleaning on the filter holes on the filter plate. By this way, the smoke particles hit the particles blocked in the filter holes, the recoil cleaning effect of the airflow and smoke particles can be further achieved, ensuring the continuous and efficient filtration of the filter plate.

[0018] The design of this pre-dust removal structure fully considers various problems encountered in actual operation. Through the combination of layered filtration and backwash clearing mechanism, it effectively solves the problem of filter plate blockage and improves the operating efficiency and stability of the entire denitrification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0020] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0021] Figure 1 It is a schematic diagram of the overall external three-dimensional structure;

[0022] Figure 2 It is a schematic diagram of the overall internal three-dimensional structure;

[0023] Figure 3 It is a schematic diagram of the overall front cross-sectional structure;

[0024] Figure 4 for Figure 3 The enlarged structural diagram at E in the middle;

[0025] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the dust removal bin;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the filter plate and its assembly parts;

[0027] Figure 7 It is a schematic diagram of the internal three-dimensional structure of the recoil tube;

[0028] Figure 8 A three-dimensional schematic diagram of the placement of the air supply tube;

[0029] Fig. 9 for Figure 8 Enlarged structural diagram at F in the middle.

[0030] In the figure: 1. air intake pipe; 2. denitration reactor; 200. rectifying grid; 201. catalyst plate; 3. smoke conveying pipe; 4. dust removal bin; 5. dust removal pipe; 500. slag discharge cover; 6. driving motor; 601. air intake fan blade; 602. power shaft; 7. filter plate; 8. needle roller; 9. ammonia spraying grid; 10. air supply pipe; 11. recoil pipe; 110. recoil chamber; 12. fan frame; 120. recoil fan blade; 13. detection column head; 14. gear ring; 15. guide frame; 150. dirt storage strip; 151. guide pipe; 152. connecting block; 16. driving gear; 17. intermediate spacer; 18. detection push rod; 19. guide ring; 20. pulley; 21. pull rope; 22. pipe cover. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Embodiment 1

[0033] See also Figure 1 and Figure 2 It can be seen that the air intake pipe 1 is placed at the desired position through a bracket, and a flange is connected to one end of the air intake pipe 1, so that the air intake pipe 1 is connected to the output end of the smoke exhaust. The drive motor 6 is limited to the outside of the air intake pipe 1 through a connecting component, and the air intake fan blade 601 located in the air intake pipe 1 is fixedly connected to the rotating shaft of the drive motor 6, so that when the drive motor 6 is started, the air intake fan blade 601 accelerates the gas flow rate inside the air intake pipe 1, ensuring that the input end of the air intake pipe 1 can have a strong suction force to accelerate the suction of smoke.

[0034] The other end of the air inlet pipe 1 is fixedly connected to a dust removal pipe 5. Figure 3It can be seen that the angle between the center line of the dust removal pipe 5 and the ground is within 30°-75°, so that the dust removal pipe 5 is inclined and opened downward when working. The dust removal pipe 5 is blocked by a slag discharge cover 500 threadedly connected to the end of the dust removal pipe 5, so as to prevent the smoke and dust airflow in the dust removal pipe 5 from being directly output from the end of the dust removal pipe 5. A dust removal bin 4 communicating with the inner cavity of the dust removal pipe 5 is fixedly connected to the middle part of the dust removal pipe 5, and the angle between the center line of the dust removal bin 4 and the center line of the dust removal pipe 5 is between 30°-60°, and the dust removal bin 4 is arranged vertically. The advantage of this arrangement is that when the air intake fan blades 601 transport the smoke airflow in the air intake pipe 1 to the dust removal pipe 5, the smoke airflow will move downward rapidly in the dust removal pipe 5 due to the inclined arrangement of the dust removal pipe 5. When the airflow passes through the dust removal bin 4, it will tend to flow upward. Since the smoke contains a large number of smoke particles, some larger smoke particles are accelerated to flow downward through the dust removal pipe 5. In the process of passing through the dust removal bin 4, the smoke particles will have a tendency to further impact in the direction of the slag discharge cover 500 due to the inertia of the smoke particles, thereby causing the larger smoke particles to be deposited at the end of the dust removal pipe 5 and located near the slag discharge cover 500.

[0035] The denitration reactor 2 is mounted on one side of the dust removal bin 4 through a bracket. Figure 2 It can be clearly seen that the top output end of the dust removal bin 4 and the top input end of the denitrification reactor 2 are connected through the smoke conveying pipe 3. When specifically connected, the flanges at both ends of the smoke conveying pipe 3 are respectively placed at the ends of the dust removal bin 4 and the denitrification reactor 2, and the dust removal bin 4 and the denitrification reactor 2 are fixed by bolts to ensure a stable connection between the dust removal bin 4 and the denitrification reactor 2. The smoke conveying pipe 3 is provided with an ammonia spraying grid 9 located above the dust removal bin 4, and its main function is to spray ammonia or ammonia-containing air evenly into the flue gas. The uniformity of mixing of ammonia or ammonia-containing air with flue gas directly determines the NO and ammonia escape concentration distribution at the outlet of the denitrification reactor, which is crucial to the overall denitrification efficiency and the operating stability of downstream equipment. The denitrification reactor 2 is fixedly connected with a rectifying grid 200, which mainly adjusts the flue gas flowing horizontally before entering the grid to flow vertically downward through the collision and integration of the flue gas in the grid. This adjustment helps to improve the flow state of the flue gas and make it better adapt to the subsequent denitrification treatment process. A multilayer catalyst plate 201 is arranged inside the denitration reactor 2 and below the rectifying grid 200. Under the action of the catalyst plate 201, ammonia reacts chemically with nitrogen oxides in the flue gas to convert the nitrogen oxides into harmless nitrogen and water, thereby achieving the purpose of removing nitrogen oxides in the flue gas.

[0036] During the specific implementation of the first embodiment, the start-up of the drive motor 6 forces the air intake fan blades 601 to rotate inside the air intake pipe 1, so that the smoke input by the air intake pipe 1 is sucked in and transported to the dust removal pipe 5. Since the smoke airflow contains more particles, when the smoke airflow is rapidly transported downward through the dust removal pipe 5, the airflow passing through the dust removal bin 4 will move upward, while the smoke particles still have a tendency to move forward due to their own inertia, forcing the smoke particles to move away from the dust removal bin 4 and finally accumulate at the slag discharge cover 500. When the slag discharge cover 500 is opened, the smoke particles generated by the accumulation can be discharged outward.

[0037] After the airflow input into the dust removal bin 4 passes through the ammonia spraying grid 9, it will be evenly mixed with the ammonia or ammonia-containing air sprayed from the ammonia spraying grid 9, and transported to the rectifying grid 200 through the smoke conveying pipe 3. The mixed airflow is evenly distributed through the rectifying grid 200, so that when the mixed airflow passes through the catalyst plate 201, under the action of the catalyst, the ammonia reacts chemically with the nitrogen oxides in the flue gas, converting the nitrogen oxides into harmless nitrogen and water. Finally, the purified gas is discharged from the bottom of the denitrification reactor 2, thereby completing the purification of the flue gas.

[0038] Embodiment 2

[0039] Further improvements are made on the basis of Example 1. Please refer to Figure 3 and Figure 5 It can be seen that since there are still a lot of smoke and dust particles in the airflow transported to the dust removal bin 4, in order to further filter the smoke and dust particles, the second embodiment of the present invention has a filter plate 7 movably installed inside the dust removal bin 4, and the smoke and dust particles are filtered according to the filter holes opened on the filter plate 7. In specific implementation, there are multiple filter plates 7. The second embodiment takes four as an example, and the actual number is not limited to this. The apertures between the multiple filter plates 7 decrease from bottom to top, thereby reducing the pressure of each layer of filtration. Through the layered filtration method, not only the filtration rate can be accelerated, but also the service life of each filter plate 7 is greatly extended.

[0040] Since long-term filtration may cause the filter holes on the filter plate 7 to become clogged, resulting in a continuous decrease in the filtration efficiency of the filter plate 7 for the smoke and dust airflow, in order to solve this problem, Figure 3 and Figure 5 It can be clearly seen that a power shaft 602 is coaxially fixed on the rotating shaft of the driving motor 6, and the end of the power shaft 602 is located on the inner side of the dust removal bin 4 after passing through the dust removal pipe 5. Specifically, the center line of the dust removal bin 4 and the center line of the power shaft 602 are on the same straight line, and the multi-layer filter plates 7 mentioned above are all fixed on the outer side of the power shaft 602, so that when the driving motor 6 is working, it will drive multiple filter plates 7 to rotate synchronously.

[0041] The middle partition 17 is fixed to the inside of the dust removal bin 4 by bolts, and the middle partition 17 is located between the two filter plates 7. As shown in the second embodiment, there are three middle partitions 17, which are supported by the middle partition 17. The air supply pipe 10 is fixedly connected to the inner side of the middle partition 17, and the end of the air supply pipe 10 is fixed with a recoil pipe 11 located between the two filter plates 7. Figure 7 It can be seen that the backwash tube 11 has a backwash chamber 110 that passes through from top to bottom, which means that the backwash tube 11 is a cylinder with a through middle. The inner diameter of the backwash tube 11 is approximately equal to the radius of the filter plate 7 (in actual application, in order to facilitate installation, the inner diameter of the backwash tube 11 is relatively smaller than the radius of the filter plate 7). Figure 4 It can be clearly seen that a driving gear 16 is movably mounted on the outer side of the recoil tube 11, and the axial end of the driving gear 16 is movably mounted on the inner side of the intermediate partition 17, so that the installation position of the driving gear 16 is limited by the recoil tube 11 and the intermediate partition 17. A fan frame 12 is fixed by a bracket on the inner side of the recoil tube 11, and a recoil blade 120 coaxial with the recoil tube 11 is movably mounted on the surface of the fan frame 12. In specific implementation, the other axial end of the driving gear 16 is placed inside the fan frame 12, and a pair of mutually meshing bevel gears are arranged through the axial ends of the recoil blade 120 and the axial ends of the driving gear 16. The bevel gears are wrapped and protected by the fan frame 12, so that when the driving gear 16 rotates, the recoil blade 120 can be rotated synchronously.

[0042] The surface of the filter plate 7 is provided with a toothed ring 14 fixed by a connecting column. Figure 4 and Figure 5 It can be clearly seen that the gear ring 14 is meshed with the driving gear 16. Combined with the above, the filter plate 7 is installed on the power shaft 602 to ensure that when the drive motor 6 is working, the rotation of the filter plate 7 forces the gear ring 14 to drive the driving gear 16 to rotate, and finally realizes the rotation of the recoil fan blade 120. It should be noted that Figure 3 It can be clearly seen that the airflow direction inside the dust removal bin 4 is from bottom to top, and finally the airflow is transported from the dust removal pipe 5 to the direction of the ammonia spray grid 9, and the rotating recoil fan blades 120 will make the airflow in the recoil chamber 110 from top to bottom, so that the airflow in the recoil chamber 110 and the airflow in the inner cavity of the dust removal bin 4 are opposite in direction, and the airflow intensity in the recoil chamber 110 is relatively large than the smoke flow intensity in the dust removal bin 4.

[0043] During the specific implementation, when the driving motor 6 drives the air intake blade 601 to rotate, the filter plate 7 will be driven to rotate synchronously through the power shaft 602. When the air intake blade 601 rotates, the airflow in the air intake pipe 1 is directly transported to the dust removal bin 4 after passing through the dust removal pipe 5 as described in the first embodiment. At this time, after the airflow is continuously filtered through the multi-layer filter plate 7, the filtered smoke airflow is transported to the smoke conveying pipe 3, thereby completing the subsequent purification of the smoke airflow. The smoke particles filtered by the filter plate 7 are present below the corresponding filter plate 7 or between two filter plates 7.

[0044] When the power shaft 602 drives the filter plate 7 to rotate, the gear ring 14 installed on the filter plate 7 drives the driving gear 16 to rotate synchronously, and the rotating driving gear 16 forces the recoil fan blade 120 to rotate. Finally, an airflow that impacts the lower filter plate 7 is generated in the recoil chamber 110, and the airflow is used to reversely impact the filter holes on the filter plate 7, so that the smoke particles blocked in the filter holes are cleared out; at the same time, since the top of the recoil pipe 11 is the bottom of the filter plate 7, that is, the filtering part, when the airflow in the recoil chamber 110 flows downward, the smoke particles filtered by the upper filter plate 7 will enter the recoil chamber 110, and when the smoke particles follow the airflow to impact downward, the smoke particles will directly impact the filter holes in the lower filter plate 7. Since the spacing between the multiple filter plates 7 is gradually reduced, the smoke particles impacting downward through the recoil chamber 110 can directly pass through the filter holes of the lower filter plate 7, so that the filtered smoke particles are used to impact the filter holes in the filter plate 7, so as to clear the filter holes.

[0045] So cycle, from Figure 3 It can be clearly seen that the multiple recoil tubes 11 are coaxially arranged, so that when the smoke particles impact downward from the recoil chamber 110, the smoke particles are successively transmitted between the multiple recoil tubes 11, and finally the smoke particles can be output from the bottom filter plate 7. Since the bottom of the lowest filter plate 7 is relatively close to the dust removal pipe 5, the smoke particles blown back from the filter plate 7 will be blown into the dust removal pipe 5.

[0046] Since the second embodiment utilizes the reverse impact of the airflow and the airflow driving the filtered smoke particles to perform reverse impact, it not only ensures that the smoke airflow can always flow on each layer of the filter plate 7, but also continuously drives the smoke particles to be blown out in the opposite direction through the recoil pipe 11, thereby reducing the retention of smoke particles between the filter plates 7 and also reducing the possibility of clogging of the filter plates 7.

[0047] from Figure 4It can be seen that an oblique angle is provided at the bottom of the recoil pipe 11, and when the recoil pipe 11 is installed, the distance between the bottom of the recoil pipe 11 and the lower filter plate 7 should be smaller than the filter hole diameter of the lower filter plate 7, but the distance should be larger than the filter hole diameter of the upper filter plate 7, so as to ensure that among the smoke and dust particles blown downward by the recoil chamber 110, if the smoke and dust particles are too large, they will be retained between the bottom of the recoil pipe 11 and the filter plate 7. Due to the continuous rotation of the filter plate 7, the smoke and dust particles will eventually be squeezed between the filter plate 7 and the bottom of the recoil pipe 11 and their volume will be reduced. At the same time, the reduced volume will not pass through the upper filter plate 7. Afterwards, when the smoke and dust particles with reduced volume pass through the recoil chamber 110 again, they can pass through the lower filter plate 7 more easily.

[0048] Since there are no smoke and dust particles on the top filter plate 7 to impact and clear, it can be removed during application. Alternatively, a needle roller 8 located on the surface of the top filter plate 7 can be movably installed on the inner side of the dust removal bin 4, and the needle columns arranged on the outer side of the needle roller 8 correspond to the filter holes on the filter plate 7, to ensure that when the filter plate 7 rotates, the needle roller 8 is inserted into the filter holes in the filter plate 7 to achieve the clearing of the filter holes on the filter plate 7.

[0049] Embodiment 3

[0050] For further improvements based on Example 2, please refer to Figure 3-Figure 5 It can be seen that the cross-sectional shape of the middle partition tube 17 is "L"-shaped, and the surface of the filter plate 7 is fixedly installed with a guide frame 15 located in the space outside the middle partition tube 17 and inside the dust removal bin 4. The guide frame 15 is arranged at an angle, so that when the filter plate 7 drives the guide frame 15 to rotate, the smoke and dust particles located on the surface of the guide frame 15 tend to move upward due to the influence of the inclined surface. At the same time, the recoil chamber 110 and the space between the outside of the gear ring 14 and the inside of the dust removal bin 4 can be connected through the air supply pipe 10, so that the smoke and dust particles between the middle partition tube 17 and the dust removal bin 4 can be transported to the recoil chamber 110.

[0051] In order to reduce the volume of smoke particles when passing through the space inside the intermediate partition 17 and the dust removal bin 4, and to ensure that the smoke particles are driven by the airflow to directly pass through the filter holes in the filter plate 7 below after entering the recoil chamber 110, therefore, in addition to the above-mentioned technology, reference is made to Figure 5 and Figure 6It can be clearly seen that the top of the guide frame 15 is fixedly connected with a dirt storage strip 150, the top of the dirt storage strip 150 is fixedly connected with a connecting block 152, and the top of the connecting block 152 is fixedly connected with a guide ring 19 that is movably sleeved on the outer side of the middle partition tube 17 and the inner side space of the dust removal bin 4, and the bottom of the guide ring 19 is higher than the height of the air supply pipe 10, so that when the guide frame 15 moves, the guide frame 15, the dirt storage strip 150 and the connecting block 152 are used to push the smoke particles upward in turn, so that the smoke particles finally reach the height of the air supply pipe 10, which is convenient for the air supply pipe 10. During suction, smoke particles are input into the recoil chamber 110. In order to reduce the volume of the smoke particles, the width of the dirt storage strip 150 and the connecting block 152 intervenes between the diameters of the filter holes in the upper / lower filter plates 7. Since the two sides of the dirt storage strip 150 and the connecting block 152 are respectively slidably connected to the inner sides of the middle partition tube 17 and the dust removal bin 4, when the smoke particles are transported upward, they are forced to be affected by the distance between the middle partition tube 17 and the dust removal bin 4, thereby reducing their own volume between the middle partition tube 17 and the dust removal bin 4 under the push of the dirt storage strip 150 and the connecting block 152.

[0052] In the actual application process, when the driving motor 6 drives the air intake fan blade 601 and the filter plate 7 to rotate, on the basis of realizing the contents of the second embodiment, under the influence of the rotation of the filter plate 7, the smoke and dust particles on the filter plate 7 move outward under the influence of centrifugal force until they move to the guide frame 15. As the filter plate 7 drives the guide frame 15 to rotate, the guide frame 15 will push the smoke and dust particles to move upward and gradually enter the space outside the middle partition tube 17 and inside the dust removal bin 4. At the same time, they are continuously pushed by the dirt storage strip 150 and the connecting block 152. The volume of the smoke and dust particles placed between the middle partition tube 17 and the dust removal bin 4 is reduced and continues to move upward until they move to the vicinity of the air supply pipe 10. Since the recoil fan blades 120 continuously transport the airflow above the recoil pipe 11 downward, the air supply pipe 10 will draw air into the recoil chamber 110. While sucking, the smoke and dust particles transported by the dirt storage strip 150 will be synchronously input into the recoil chamber 110. Since the volume of the input smoke and dust particles is easy to pass through the filter plate 7 below, the cleaning strength of the smoke and dust particles on the filter plate 7 below is further enhanced.

[0053] In order to ensure that the air supply pipe 10 has sufficient suction strength, Figure 7 It can be seen that a tube cover 22 is mounted on the top end of the recoil tube 11, and the tube cover 22 and the recoil tube 11 are limited by bolts. By tightening the bolts, the upper and lower movable areas of the tube cover 22 at the end of the recoil tube 11 can be limited to prevent the tube cover 22 from falling off the recoil tube 11. Since the inner side of the tube cover 22 is smaller than the inner diameter of the recoil tube 11, when the recoil fan blade 120 rotates, the hollow interior of the tube cover 22 is not enough to provide sufficient airflow. Therefore, the airflow will be supplemented through the air supply tube 10 to ensure that there is sufficient suction strength in the air supply tube 10.

[0054] Embodiment 4

[0055] For further improvements based on Example 3, please refer to Figure 6 It can be seen that the back of the guide frame 15 is fixedly connected with a guide tube 151, and the back of the connecting block 152 is sleeved on the guide tube 151, so that the connecting block 152 can move up and down through the guidance of the guide tube 151. On this basis, the dirt storage strip 150 is set as a flexible rubber, so that when the connecting block 152 is away from the guide frame 15, the dirt storage strip 150 is transformed into a plane according to the pulling between the connecting block 152 and the guide frame 15, so that the smoke particles can slide from the surface; when the connecting block 152 is close to the guide frame 15, the guide frame 15 is driven to rotate by the continuously rotating filter plate 7, and the dirt storage strip 150 is forced to turn into an arc due to the friction between the dirt storage strip 150 and the middle partition tube 17 and the inner side of the dust removal bin 4. When the smoke particles pass through the arc-shaped dirt storage strip 150, the arc-shaped dirt storage strip 150 is used to accumulate the smoke particles, so as to prevent the smoke particles from continuing to move upward. Combined with Figure 6 It can be clearly seen that there are multiple guide frames 15, and the multiple guide frames 15 are distributed at equal angles on the outermost side of the surface of the filter plate 7. Therefore, when all the dirt retaining strips 150 are transformed into arcs, the flow of smoke particles between the air supply pipe 10 and the outer side of the middle partition tube 17 can be cut off.

[0056] from Figure 3 , Figure 4 , Figure 8 and Fig. 9 It can be clearly seen that the inner side of the recoil tube 11 is movably mounted with a detection column head 13 located below the recoil blade 120, and the outer side of the recoil tube 11 is hinged with a detection push rod 18, one end of the detection column head 13 extends to the outer side of the recoil tube 11 and is movably connected to the detection push rod 18. When the detection column head 13 moves inside the recoil tube 11, the detection push rod 18 will also deflect around the hinge point. Correspondingly, the top of the detection push rod 18 is located below the pipe cover 22, and the bottom of the pipe cover 22 is provided with an inclined surface. Under normal conditions, the pipe cover 22 is downwardly moved by gravity and the detection push rod 18 is pressed by the inclined surface, so that the detection push rod 18 is close to the outer side of the recoil tube 11. When the detection column head 13 is pushed toward the outer side of the recoil tube 11, the deflected detection push rod 18 pushes the inclined surface at the bottom of the pipe cover 22, forcing the pipe cover 22 to also have a tendency to move upward.

[0057] There is a pulley 20 at the top of the middle partition tube 17, which is fitted through the guide rectangular rod, and the pulley 20 is installed on the "T"-shaped channel steel at the top of the guide ring 19 through rollers. When the guide ring 19 rotates, the rollers on the pulley 20 rotate to prevent the pulley 20 from moving synchronously with the guide ring 19. Similarly, when the pulley 20 moves up and down, it can pull the guide ring 19 to move up and down, and the pulley 20 is connected to the detection push rod 18 through the pull rope 21, so that the pull rope 21 is pulled according to the deflection of the detection push rod 18, thereby controlling the guide ring 19 to move up and down.

[0058] Specifically, during the implementation process, the driving motor 6 drives the air intake blades 601 and the filter plate 7 to rotate simultaneously. The rotation of the air intake blades 601 realizes the transportation of the smoke airflow in the air intake pipe 1 to the dust removal bin 4. The rotation of the filter plate 7, on the one hand, forces the recoil blades 120 to rotate through the transmission of the gear ring 14 and the driving gear 16. On the other hand, the filter plate 7 drives the guide frame 15 to rotate, so that the smoke particles on the surface of the filter plate 7 affected by the centrifugal force are pushed by the guide frame 15 to between the outer side of the middle partition tube 17 and the inner side of the dust removal bin 4.

[0059] If there is no accumulation of smoke and dust particles at the bottom of the recoil tube 11, the airflow in the recoil chamber 110 is blown by the recoil blades 120, and the airflow can flow from top to bottom normally. At the same time, under the action of the gravity of the tube cover 22, the detection push rod 18 is pushed to the outside of the recoil tube 11 through the inclined surface below the tube cover 22. The airflow pressure in the recoil chamber 110 below the recoil blades 120 is not enough to push the detection column head 13 to move outward; when the detection push rod 18 is close to the outside of the recoil tube 11, it will pull the pulley 20 upward through the pull rope 21, and the upward pulley 20 will The guide ring 19 is driven to be lifted up, and the guide ring 19 pulls the connecting block 152 upward at the same time. The connecting block 152 is guided away from the guide frame 15 by the guide tube 151, and the pulled dirt storage strip 150 forms a plane, so that the smoke and dust particles pushed by the guide frame 15 are transported to the vicinity of the air supply pipe 10 after passing through the dirt storage strip 150 and the connecting block 152. When passing through the air supply pipe 10, the smoke and dust particles are sucked by the air supply pipe 10, so that the smoke and dust particles enter the recoil chamber 110, and collide with the filter holes on the filter plate 7 with the airflow blowing downward in the recoil chamber 110, so as to clear the filter holes on the filter plate 7.

[0060] If dust particles accumulate at the bottom of the recoil tube 11 due to excessive ingress, the pressure in the recoil chamber 110 below the recoil blade 120 will increase. The increased airflow pressure will push the detection column head 13 toward the outside of the recoil tube 11, thereby forcing the detection push rod 18 to deflect outward. As the detection push rod 18 deflects outward:

[0061] On the one hand, the top of the detection push rod 18 will push the inclined surface of the tube cover 22, forcing the tube cover 22 to move upward. This method can not only reduce the smoke and dust particles on the outside of the recoil tube 11 from entering the recoil chamber 110 and reduce the accumulation of smoke and dust particles, but also make the tube cover 22 closer to the bottom of the upper recoil tube 11 after the upward movement, so that more airflow in the upper recoil tube 11 is blown into the lower recoil chamber 110, thereby enhancing the airflow pressure in the recoil chamber 110.

[0062] On the other hand, when the detection push rod 18 deflects outward, the pull rope 21 no longer goes up on the pulling pulley 20, and under the gravity of the guide ring 19 itself, the guide ring 19 and the dirt retaining strip 150 are guided downward through the guide tube 151, forcing the dirt retaining strip 150 to turn into an arc shape. Combined with the above, the arc-shaped dirt retaining strip 150 can accommodate smoke particles, thereby cutting off the upward movement of smoke particles, thereby reducing the transportation of smoke particles into the air supply pipe 10.

[0063] It can be seen that when smoke particles gather at the bottom of the recoil tube 11, the input of smoke particles will be reduced and the airflow input intensity will be enhanced. As the smoke particles at the bottom of the recoil tube 11 are continuously blown out, the airflow pressure at the bottom of the recoil chamber 110 will be relieved. When the pressure is reduced, the gravity of the tube cover 22 will push the detection push rod 18 close to the recoil tube 11 again, and then the cycle will be repeated as described above.

Claims

1. A pre-dust removal structure of a dusty flue gas SCR denitrification system, characterized in that: include: An air inlet pipe (1) has one end connected to a flange and the other end fixedly connected to a dust removal pipe (5), and the dust removal pipe (5) is arranged to be tilted downward; A driving motor (6) is fixed on the outside of the air intake pipe (1), and the rotating shaft is fixedly connected to an air intake fan blade (601) located in the air intake pipe (1); A slag discharge cover (500) is threadedly connected to the end of the dust removal pipe (5); A dust removal bin (4) having a bottom fixed to the middle of the dust removal pipe (5) and a top connected to the denitration reactor (2) via a smoke conveying pipe (3); the denitration reactor (2) is mounted on one side of the dust removal bin (4) via a bracket; An ammonia spraying grid (9) is installed in the smoke conveying pipe (3) and is located above the dust removal bin (4); A rectifying grid (200) installed inside the denitration reactor (2); A catalyst plate (201) installed inside the denitration reactor (2) and located below the rectifying grid (200); A filter plate (7) is movably installed inside the dust removal bin (4), and filter holes are formed on the filter plate (7). A plurality of filter plates (7) are provided, and the apertures of the plurality of filter plates (7) decrease in sequence from bottom to top. The power shaft (602) is coaxially fixed to the rotating shaft of the driving motor (6), and the power shaft (602) is located inside the dust removal bin (4), and the filter plate (7) is coaxially fixed to the power shaft (602); A middle partition cylinder (17) is fixed inside the dust removal bin (4) and is located between the two filter plates (7), and has an air supply pipe (10) fixedly connected to the inner side thereof; A recoil pipe (11) is fixed to the end of the air supply pipe (10), has a recoil chamber (110) formed therein, has a driving gear (16) movably mounted on the outside, is fixedly connected to a fan frame (12) on the inside, and has an axial end of the driving gear (16) extending into the inside of the fan frame (12); The recoil fan blade (120) is movably mounted on the surface of the fan frame (12), and the shaft end of the driving gear (16) is driven by the fan frame (12) to drive the recoil fan blade (120) to rotate; A gear ring (14) is fixed to the surface of the filter plate (7) and meshes with the driving gear (16); The rotating recoil blades (120) cause the airflow in the recoil chamber (110) to flow in opposite directions to the airflow in the inner cavity of the dust removal bin (4), and the airflow intensity in the recoil chamber (110) is relatively greater than the smoke flow intensity in the dust removal bin (4).

2. The pre-dust removal structure of the dust-containing flue gas SCR denitration system according to claim 1 is characterized in that: A needle roller (8) located on the surface of the filter plate (7) is movably mounted on the inner side of the dust removal bin (4).

3. The pre-dust removal structure of the dusty flue gas SCR denitration system according to claim 1 is characterized in that: Also included are: The guide frame (15) is fixed on the surface of the filter plate (7) and is located in the space outside the middle partition cylinder (17) and inside the dust removal bin (4). The air supply pipe (10) enables the space to communicate with the recoil chamber (110); The dirt storage strip (150) is fixed on the top of the guide frame (15), the top of which is fixedly connected to a connecting block (152), and the top of the connecting block (152) is fixedly connected to a guide ring (19).

4. The pre-dust removal structure of the dust-containing flue gas SCR denitration system according to claim 3 is characterized in that: A tube cover (22) is sleeved on the top end of the recoil tube (11), and a slope is formed on the bottom of the tube cover (22).

5. The pre-dust removal structure of the dust-containing flue gas SCR denitration system according to claim 4 is characterized in that: Also included are: A guide tube (151) is fixed to the back of the guide frame (15), and the back of the connecting block (152) is sleeved on the guide tube (151); A detection column head (13) is movably mounted on the inner side of the recoil pipe (11) and is located below the recoil blade (120); A detection push rod (18) is hinged on the outside of the recoil tube (11), movably connected to one end of the detection column head (13), and the top is located below the tube cover (22); The pulley (20) is sleeved on the top of the middle partition tube (17), the bottom is movably mounted on the top of the guide ring (19), and the top is connected to the detection push rod (18) through a pull rope (21).

6. The pre-dust removal structure of the dust-containing flue gas SCR denitration system according to claim 5 is characterized in that: The dirt storage strip (150) is a flexible rubber strip.

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