A coking flue gas desulfurization ultra-clean emission device

Abstract

This invention relates to the field of flue gas filtration technology and discloses a coking flue gas desulfurization ultra-clean emission device, comprising a flowing annular dust suppression mechanism and a wastewater separation mechanism. Internally, it includes a filter bag located at the bottom of a longitudinal discharge chamber, enabling solid-liquid separation; a lower blocking moving plate blocked at the bottom port of the filter bag and capable of longitudinal movement; and an upper and lower annular permanent magnets that cause the lower blocking moving plate to block the bottom of the filter bag by suction. This coking flue gas desulfurization ultra-clean emission device allows gas carrying particulate matter to flow along an annular region. Under the action of centrifugal force, the particulate matter is located on the outer side of the annular region. Simultaneously, a spray head sprays atomized liquid into the annular region. During the flow, both the atomized liquid and particulate matter are concentrated on the outer side of the annular region, thereby allowing the atomized liquid and particulate matter to adhere in the concentrated area, thus improving the dust suppression effect on the flue gas.

Description

Technical Field

[0001] This invention relates to the field of flue gas filtration technology, specifically to a coking flue gas desulfurization and ultra-clean emission device. Background Technology

[0002] Currently, when coal-fired boilers are burning, the various organic and inorganic sulfur contained in the coal are converted into sulfur oxides, mainly sulfur dioxide. Sulfur dioxide enters the atmosphere and combines with water in the atmosphere to form acid rain, which not only has a serious impact on ground buildings and crops, but also harms human health. Therefore, flue gas desulfurization is an important part of environmental protection.

[0003] To this end, Chinese Patent No. CN211098228U discloses "An ultra-clean emission flue gas desulfurization device", the main structure of which includes a flue, a settling device located at the flue inlet, and a dust removal device located after the settling device. The settling device includes a settling chamber, the cross-sectional area of ​​which is larger than that of the flue. When the flue gas enters the settling chamber from the flue, the flow rate of the flue gas will slow down because the cross-sectional area of ​​the settling chamber is larger than that of the flue. This causes the large particles in the flue gas to move relative to the gas, and the large particles fall to the bottom of the settling chamber due to their own gravity.

[0004] It is obvious that the above-mentioned ultra-clean emission flue gas desulfurization device uses the gravity of large particles to separate them from the flue gas. However, in reality, some fine and larger particles will still be mixed in the gas due to the airflow. The effective filtration measures for particles are very simple and the separation effect is not obvious. This can easily lead to particles entering the desulfurization tower with the airflow, causing waste accumulation inside the desulfurization tower and seriously affecting the effective desulfurization of flue gas by the desulfurization tower. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a coking flue gas desulfurization ultra-clean emission device. This device allows gas containing particulate matter to flow along an annular region. Under centrifugal force, the particulate matter is located on the outer side of the annular region. Simultaneously, a spray nozzle sprays atomized liquid into the annular region. During the flow process, both the atomized liquid and particulate matter concentrate on the outer side of the annular region, causing them to adhere in the concentrated area. This improves the dust reduction effect on the flue gas and solves the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a coking flue gas desulfurization ultra-clean emission device, comprising a flowing annular dust settling mechanism, which internally includes an annular dust settling chamber for flue gas flow, a spray head located inside the annular dust settling chamber and capable of spraying atomized liquid into the annular dust settling chamber, a longitudinal sewage discharge chamber located at the tail of the annular dust settling chamber and for discharging pollutants downwards, and a gas discharge gap located at the bottom region of the longitudinal sewage discharge chamber and for discharging gas outwards; and a wastewater separation mechanism, which internally includes a filter bag located at the bottom of the longitudinal sewage discharge chamber and capable of solid-liquid separation, a lower blocking moving plate blocked at the bottom port of the filter bag and capable of longitudinal movement, and an upper annular permanent magnet and a lower annular permanent magnet that cause the lower blocking moving plate to block the bottom of the filter bag by suction.

[0007] Preferably, the flowing annular dust suppression mechanism includes a semi-annular flowing outer shell, an annular dust suppression chamber is provided inside the semi-annular flowing outer shell, a gas docking channel connecting the external space and the beginning of the annular dust suppression chamber is provided at the front end of the semi-annular flowing outer shell, a longitudinal sewage pipe integrally formed with the rear end of the semi-annular flowing outer shell is provided at the bottom, a first docking plate integrally formed with the bottom end of the longitudinal sewage pipe is provided, an annular liquid flow chamber is provided inside the semi-annular flowing outer shell located inside the annular dust suppression chamber, multiple spray heads for discharging the liquid inside the annular liquid flow chamber into the annular dust suppression chamber in the form of atomization are installed inside the semi-annular flowing outer shell, a first liquid docking channel integrally formed with the inner surface of the semi-annular flowing outer shell and connected to the annular liquid flow chamber is provided, a longitudinal sewage discharge chamber with an open bottom and a top end connected to the rear end of the annular dust suppression chamber is provided inside the longitudinal sewage discharge pipe, a gas discharge gap connecting the external space and the longitudinal sewage discharge chamber is provided near the bottom of the circumferential wall thickness of the longitudinal sewage discharge pipe.

[0008] Preferably, the liquid jet direction of the spray head is perpendicular and faces the annular surface outside the annular dust suppression chamber.

[0009] Preferably, the spray head is a nozzle that sprays liquid outward in an atomized form under liquid pressure, and its atomization spray intensity is proportional to the hydraulic pressure.

[0010] Preferably, the wastewater separation mechanism includes an upper limit mounting plate and a lower limit mounting plate, which are fixedly connected by a longitudinal connecting rod. The upper and lower limit mounting plates are respectively provided with an upper wastewater flow hole and a lower wastewater flow hole inside. The upper surface of the upper limit mounting plate is fixedly mounted on the bottom of a first docking plate, and the top of the upper wastewater flow hole communicates with the bottom of the longitudinal discharge chamber. A filter bag is installed between the upper and lower limit mounting plates, and the top of the filter bag communicates with the upper wastewater flow. The bottom end of the moving hole and the bottom end of the filter bag are connected to the top end of the lower dirt flow hole. The bottom of the upper limit mounting plate is fixedly installed with a longitudinal limit rod in the longitudinal direction. The plate body of the lower blockage moving plate is provided with a limit sliding hole that can slide along the longitudinal limit rod axially. The bottom end of the longitudinal limit rod is provided with a lower limit plate that is integral with it and can prevent the lower blockage moving plate from falling off. The bottom of the lower limit mounting plate is embedded with an upper annular permanent magnet at the periphery of the lower dirt flow hole. The lower blockage moving plate is embedded with an annular permanent magnet at the corresponding position.

[0011] Preferably, the magnetic poles at the bottom of the upper annular permanent magnet are opposite to those at the top of the lower annular permanent magnet, and the attraction between the upper and lower annular permanent magnets during operation is sufficient to cause the lower blocking moving plate to abut against the bottom of the lower limiting mounting plate.

[0012] Preferably, the cross-sectional shape of the limiting sliding hole is consistent with the cross-sectional shape of the longitudinal limiting rod, both being polygonal structures, and the structural dimensions of the cross-sectional shape of the limiting sliding hole match the structural dimensions of the cross-sectional shape of the longitudinal limiting rod.

[0013] Preferably, it also includes a water pressure control mechanism, which is internally provided with a first liquid discharge hole that can divert the water flow to the first liquid docking channel, a movable valve plate that blocks the discharge port of the first liquid discharge hole and can move longitudinally, and a helical spring that generates downward elastic pressure on the movable valve plate.

[0014] Preferably, the water pressure control mechanism includes a second liquid docking channel that docks with the first liquid docking channel. A longitudinal hollow outer shell, integrally formed with the second liquid docking channel, is provided on one side. A longitudinal component movable cavity is provided inside the longitudinal hollow outer shell. A first liquid discharge hole, connecting the bottom of the longitudinal component movable cavity and the middle cavity of the second liquid docking channel, is provided at the bottom of the longitudinal hollow outer shell. A second liquid discharge hole, connecting the external space and the top of the longitudinal component movable cavity, is provided at the top of the longitudinal component movable cavity. A movable valve plate, capable of moving axially along the longitudinal component movable cavity, is placed inside the longitudinal component movable cavity. The circumferential surface of the movable valve plate has a concave structure for liquid flow grooves. A compressed helical spring is installed above the movable valve plate, and an annular sealing ring is embedded at the bottom of the movable valve plate.

[0015] Preferably, the thickness of the annular sealing ring is greater than the depth of the embedded groove in the movable valve plate, the structural radius of the inner ring of the annular sealing ring is greater than the structural radius of the first liquid discharge hole, and the structural radius of the outer ring of the annular sealing ring is less than the distance between the liquid flow groove and the axis of the movable valve plate.

[0016] Compared with the prior art, the present invention provides a coking flue gas desulfurization ultra-clean emission device, which has the following beneficial effects:

[0017] This causes the gas containing particulate matter to flow along the annular area. Under the action of centrifugal force, the particulate matter will be located on the outside of the annular area. At the same time, atomized liquid is sprayed into the annular area using a spray head. During the flow, both the atomized liquid and the particulate matter are concentrated on the outside of the annular area, so that the atomized liquid and the particulate matter adhere to the concentrated area, thereby improving the dust suppression effect on the flue gas. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention.

[0019] Figure 2 This is a perspective view of the flowing annular dust collection mechanism in this invention.

[0020] Figure 3 This is a three-dimensional cross-sectional view of the flow-type annular dust collection mechanism in this invention from a first perspective.

[0021] Figure 4 This is a three-dimensional cross-sectional view of the flow-type annular dust collection mechanism in this invention from a second perspective.

[0022] Figure 5 This is a perspective view of the wastewater separation mechanism in this invention.

[0023] Figure 6 This is a three-dimensional cross-sectional view of the wastewater separation mechanism in this invention.

[0024] Figure 7 This is a three-dimensional cross-sectional view of the water pressure control mechanism in this invention.

[0025] Figure 8 This is a perspective view of the movable valve plate in this invention.

[0026] The components include: 1. Flowing annular dust suppression mechanism; 11. Semi-annular flowing outer shell; 12. Longitudinal sewage discharge pipe; 13. No. 1 docking plate; 14. Annular dust suppression chamber; 15. Gas docking channel; 16. Annular liquid flow chamber; 17. Spray head; 18. No. 1 liquid docking channel; 19. Longitudinal sewage discharge chamber; 110. Gas emission notch; 2. Sewage separation mechanism; 21. Upper limit mounting plate; 22. Lower limit mounting plate; 23. Longitudinal connecting rod; 24. Upper sewage flow hole; 25. Lower sewage flow channel. 26. Filter bag; 27. Longitudinal limiting rod; 28. Lower blocking moving plate; 29. ​​Limiting sliding hole; 210. Lower limiting plate; 211. Upper annular permanent magnet; 212. Lower annular permanent magnet; 3. Water pressure control mechanism; 31. Longitudinal hollow shell; 32. Longitudinal component moving cavity; 33. Second liquid docking channel; 34. First liquid discharge hole; 35. Second liquid discharge hole; 36. Moving valve plate; 37. Liquid flow channel; 38. Annular sealing ring; 39. Helical spring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 A coking flue gas desulfurization ultra-clean emission device connects the gas connection channel 15 to the discharge port of a flue gas discharge pipeline, and connects the first liquid connection channel 18 to the drain port of a water pump to complete the pre-operation preparation work.

[0029] To achieve a flowing atomization dust suppression effect on flue gas, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4A flowing annular dust suppression mechanism 1 needs to be installed, which includes an annular dust suppression chamber 14 for flue gas flow, a spray head 17 located inside the annular dust suppression chamber 14 for spraying atomized liquid into the annular dust suppression chamber 14, a longitudinal discharge chamber 19 located at the tail of the annular dust suppression chamber 14 for downward discharge of pollutants, and a gas discharge outlet 110 located at the bottom of the longitudinal discharge chamber 19 for outward discharge of gas. When the water pump and flue gas emission equipment are started, the flue gas will flow rapidly inside the annular dust suppression chamber 14. At that time, the liquid will be sprayed into the annular dust settling chamber 14 through the spray head 17 in the form of atomized liquid. The high-speed flowing flue gas particles and atomized liquid will be concentrated in the outer ring area of ​​the annular dust settling chamber 14 under the action of centrifugal force. During the flow, the flue gas particles will be adsorbed by the atomized liquid, thereby increasing the overall mass. Finally, it will be discharged downward through the longitudinal sewage discharge chamber 19, while the purified gas generated will be discharged outward through the gas discharge gap 110, and the dirt will flow downward, thereby achieving the effect of flowing atomized dust settling of flue gas.

[0030] For details regarding the specific structure of the aforementioned flowing annular dust collection mechanism 1, please refer to [link / reference needed]. Figure 2 , Figure 3 and Figure 4 The system includes a semi-annular flow shell 11, inside which is an annular dust settling chamber 14. At the front end of the semi-annular flow shell 11, a gas connection channel 15 connects the external space and the front end of the annular dust settling chamber 14. At the bottom of the rear end of the semi-annular flow shell 11, a longitudinal drain pipe 12 integrally formed with it is provided. At the bottom end of the longitudinal drain pipe 12, a first connection plate 13 integrally formed with it is provided. An annular liquid flow chamber 16 is provided inside the semi-annular flow shell 11, located within the annular dust settling chamber 14. Multiple atomized liquids from the annular liquid flow chamber 16 are installed inside the semi-annular flow shell 11 to discharge the liquids from the annular liquid flow chamber 16 into the annular dust settling chamber. The spray head 17 inside the 14 has a first liquid docking channel 18 integrally formed with the inner surface of the semi-annular flow shell 11 and connected to the annular liquid flow chamber 16. The longitudinal sewage pipe 12 has a longitudinal sewage chamber 19 with an open bottom and a top connected to the tail of the annular dust settling chamber 14. The longitudinal sewage pipe 12 has a gas discharge gap 110 near its bottom circumferential wall thickness that connects to the external space and the longitudinal sewage chamber 19. The liquid spray direction of the spray head 17 is vertical and faces the annular surface outside the annular dust settling chamber 14. The spray head 17 is a nozzle that sprays liquid outward in an atomized form under liquid pressure, and its atomization spray intensity is proportional to the hydraulic pressure.

[0031] To achieve effective separation of wastewater and solid waste in sludge, please refer to [link / reference]. Figure 1 , Figure 5 and Figure 6A wastewater separation mechanism 2 needs to be installed. Inside the mechanism, there is a filter bag 26 located at the bottom of the longitudinal discharge chamber 19, which enables solid-liquid separation; a lower blocking moving plate 28 that is blocked at the bottom port of the filter bag 26 and can move longitudinally; and an upper annular permanent magnet 211 and a lower annular permanent magnet 212 that cause the lower blocking moving plate 28 to block the bottom of the filter bag 26 by suction. The sludge formed by wastewater and solid waste will accumulate inside the filter bag 26, and the filter bag 26 will discharge the wastewater after filtration. The filtered wastewater can be recycled. When it is necessary to discharge solid waste, the lower blocking moving plate 28 is pressed down. When the sum of pressure and gravity is greater than the suction force between the upper annular permanent magnet 211 and the lower annular permanent magnet 212, the lower blocking moving plate 28 will move away from the lower limit mounting plate 22, and the solid waste will fall off under its own gravity, thereby achieving effective separation of wastewater and solid waste in the sludge.

[0032] For details regarding the specific structure of the wastewater separation mechanism 2, please refer to [link / reference]. Figure 1 The system includes an upper limit mounting plate 21 and a lower limit mounting plate 22, which are fixedly connected by a longitudinal connecting rod 23. The upper limit mounting plate 21 and the lower limit mounting plate 22 are respectively provided with an upper waste flow hole 24 and a lower waste flow hole 25 inside. The upper surface of the upper limit mounting plate 21 is fixedly mounted on the bottom of the first docking plate 13, and the top of the upper waste flow hole 24 is connected to the bottom of the longitudinal sewage discharge chamber 19. A filter bag 26 is installed between the upper limit mounting plate 21 and the lower limit mounting plate 22, with the top of the filter bag 26 connected to the bottom of the upper waste flow hole 24 and the bottom of the filter bag 26 connected to the top of the lower waste flow hole 25. A longitudinal limiting rod 27 is fixedly mounted on the bottom of the upper limit mounting plate 21. A mechanism that can move along the axis of the longitudinal limiting rod 27 is provided in the body of the lower blocking moving plate 28. The sliding limiting hole 29 has a lower limiting plate 210 at the bottom of the longitudinal limiting rod 27, which is integral with it and can prevent the lower blocking moving plate 28 from falling off. The bottom of the lower limiting mounting plate 22 has an upper annular permanent magnet 211 embedded around the lower sewage flow hole 25. The lower blocking moving plate 28 has a lower annular permanent magnet 212 embedded in the corresponding part. The magnetic poles at the bottom of the upper annular permanent magnet 211 are opposite to the magnetic poles at the top of the lower annular permanent magnet 212. The attraction force of the upper annular permanent magnet 211 and the lower annular permanent magnet 212 during operation is sufficient to make the lower blocking moving plate 28 abut against the bottom of the lower limiting mounting plate 22. The cross-sectional shape of the limiting sliding hole 29 is consistent with the cross-sectional shape of the longitudinal limiting rod 27, both being polygonal structures. The cross-sectional dimensions of the limiting sliding hole 29 match the cross-sectional dimensions of the longitudinal limiting rod 27.

[0033] To prevent excessive water pump pressure from causing excessive atomized liquid volume and damage to spray head 17 due to excessive pressure, please refer to [link / reference]. Figure 1 , Figure 7 and Figure 8 A water pressure control mechanism 3 needs to be installed. Inside the mechanism, there is a first liquid discharge hole 34 that can divert the water flow to the first liquid docking channel 18, a movable valve plate 36 that blocks the discharge port of the first liquid discharge hole 34 and can move longitudinally, and a spiral spring 39 that exerts downward elastic pressure on the movable valve plate 36. The water flow to the first liquid docking channel 18 will exert upward pressure on the movable valve plate 36 through the first liquid discharge hole 34. When the pressure is greater than the elastic pressure of the spiral spring 39, the spiral spring 39 will be compressed, and the movable valve plate 36 will move upward. At this time, the water flow will flow upward through the movement gap and then release pressure through the second liquid discharge hole 35, thereby preventing the water pump from supplying too much pressure, which would cause too much atomized liquid and damage to the spray head 17 due to excessive pressure.

[0034] For details regarding the specific structure of the water pressure control mechanism 3, please refer to [link / reference]. Figure 7 and Figure 8 This includes a second liquid docking channel 33 that docks with the first liquid docking channel 18. A longitudinal hollow outer shell 31, integrally formed with the second liquid docking channel 33, is provided on one side. A longitudinal component movable cavity 32 is provided inside the longitudinal hollow outer shell 31. A first liquid discharge hole 34, connecting the bottom of the longitudinal component movable cavity 32 and the middle cavity of the second liquid docking channel 33, is provided at the bottom of the longitudinal hollow outer shell 31. A second liquid discharge hole 35, connecting the external space and the top of the longitudinal component movable cavity 32, is provided at the top of the longitudinal hollow outer shell 31. A component capable of moving longitudinally... A movable valve plate 36 moves axially toward the movable cavity 32 of the component. The circumferential surface of the movable valve plate 36 is provided with a concave structure for liquid flow groove 37 for liquid flow. A helical spring 39 in a compressed state is installed above the movable valve plate 36. An annular sealing ring 38 is embedded at the bottom of the movable valve plate 36. The thickness of the annular sealing ring 38 is greater than the embedding groove depth in the movable valve plate 36. The structural radius of the inner ring of the annular sealing ring 38 is greater than the structural radius of the first liquid discharge hole 34, and the structural radius of the outer ring of the annular sealing ring 38 is less than the distance between the center line of the liquid flow groove 37 and the axis of the movable valve plate 36.

[0035] In use, connect the gas connection channel 15 to the exhaust port of a flue gas duct, and connect the first liquid connection channel 18 to the drain port of a water pump. Start the water pump and flue gas emission equipment. At this time, the flue gas will flow rapidly inside the annular dust settling chamber 14. Simultaneously, the liquid will be sprayed into the annular dust settling chamber 14 in the form of atomized liquid through the spray head 17. The high-speed flowing flue gas particles and atomized liquid will be concentrated in the outer ring area of ​​the annular dust settling chamber 14 under the action of centrifugal force. During the flow, the flue gas particles will be adsorbed by the atomized liquid, thereby increasing the overall mass. Finally, it will pass through the longitudinal sewage discharge chamber 1. 9. The purified gas generated is discharged downwards through the gas discharge opening 110, while the waste flows downwards. The waste formed by sewage and solid waste accumulates inside the filter bag 26. The filter bag 26 allows the sewage to be discharged after filtration. The filtered sewage can be recycled. When solid waste needs to be discharged, the lower blocking moving plate 28 is pressed down. When the sum of pressure and gravity is greater than the attraction between the upper annular permanent magnet 211 and the lower annular permanent magnet 212, the lower blocking moving plate 28 will move away from the lower limit mounting plate 22, and the solid waste will fall off under its own gravity.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coking flue gas desulfurization and ultra-clean emission device, characterized in that: include, The flowable annular dust suppression mechanism (1) is provided with an annular dust suppression chamber (14) for flue gas flow, a spray head (17) located inside the annular dust suppression chamber (14) and capable of spraying atomized liquid into the annular dust suppression chamber (14), a longitudinal sewage discharge chamber (19) located at the tail of the annular dust suppression chamber (14) for discharging pollutants downwards, and a gas discharge gap (110) located at the bottom area of ​​the longitudinal sewage discharge chamber (19) for discharging gas outwards. And a sewage separation mechanism (2), which is provided with a filter bag (26) located at the bottom of the longitudinal sewage discharge chamber (19) and capable of solid-liquid separation, a lower blocking moving plate (28) that is blocked at the bottom port of the filter bag (26) and capable of longitudinal movement, and an upper annular permanent magnet (211) and a lower annular permanent magnet (212) that cause the lower blocking moving plate (28) to block the bottom of the filter bag (26) by suction. The flowing annular dust collection mechanism (1) includes a semi-annular flowing shell (11), inside which is an annular dust collection chamber (14). At the head end of the semi-annular flowing shell (11) is a gas connection channel (15) connecting the external space and the head end of the annular dust collection chamber (14). At the bottom of the tail end of the semi-annular flowing shell (11) is a longitudinal drain pipe (12) integrally formed with it. At the bottom end of the longitudinal drain pipe (12) is a first connection plate (13) integrally formed with it. An annular liquid flow chamber (16) is located inside the annular dust collection chamber (14) of the semi-annular flowing shell (11). The semi-annular flow shell (11) is equipped with multiple spray heads (17) for discharging the liquid inside the annular liquid flow chamber (16) into the annular dust settling chamber (14) in the form of atomization. The inner surface of the semi-annular flow shell (11) is provided with a first liquid docking channel (18) that is integral with it and communicates with the annular liquid flow chamber (16). The longitudinal sewage pipe (12) is provided with a longitudinal sewage chamber (19) with an open bottom and a top end that communicates with the tail of the annular dust settling chamber (14). The longitudinal sewage pipe (12) is provided with a gas discharge gap (110) that communicates with the external space and the longitudinal sewage chamber (19) near the circumferential wall thickness of its bottom end. The wastewater separation mechanism (2) includes an upper limit mounting plate (21) and a lower limit mounting plate (22). The upper limit mounting plate (21) and the lower limit mounting plate (22) are fixedly connected by a longitudinal connecting rod (23). The upper limit mounting plate (21) and the lower limit mounting plate (22) are respectively provided with an upper sludge flow hole (24) and a lower sludge flow hole (25). The upper surface of the upper limit mounting plate (21) is fixedly installed at the bottom of the first docking plate (13), and the top of the upper sludge flow hole (24) is connected to the bottom of the longitudinal sewage discharge chamber (19). A filter bag (26) is installed between the upper limit mounting plate (21) and the lower limit mounting plate (22), and the top of the filter bag (26) is connected to the upper sludge flow. The bottom end of the moving hole (24) and the bottom end of the filter bag (26) are connected to the top end of the lower dirt flow hole (25). The bottom of the upper limit mounting plate (21) is fixedly installed with a longitudinal limit rod (27) in the longitudinal direction. The plate body of the lower blockage moving plate (28) is provided with a limit sliding hole (29) that can slide along the longitudinal limit rod (27) axially. The bottom end of the longitudinal limit rod (27) is provided with a lower limit plate (210) that is integral with it and can prevent the lower blockage moving plate (28) from falling off. The bottom of the lower limit mounting plate (22) is embedded with an upper annular permanent magnet (211) on the periphery of the lower dirt flow hole (25). The lower blockage moving plate (28) is embedded with a lower annular permanent magnet (212) at the corresponding position.

2. The coking flue gas desulfurization ultra-clean emission device according to claim 1, characterized in that: The liquid jetting direction of the spray head (17) is perpendicular to and faces the annular surface outside the annular dust settling chamber (14).

3. The coking flue gas desulfurization ultra-clean emission device according to claim 2, characterized in that: The spray head (17) is a nozzle that sprays liquid outward in an atomized form under liquid pressure, and its atomization spray intensity is proportional to the hydraulic pressure.

4. The coking flue gas desulfurization ultra-clean emission device according to claim 3, characterized in that: The magnetic poles at the bottom of the upper annular permanent magnet (211) are opposite to those at the top of the lower annular permanent magnet (212), and the attraction of the upper annular permanent magnet (211) and the lower annular permanent magnet (212) during operation is sufficient to cause the lower blocking moving plate (28) to abut against the bottom of the lower limiting mounting plate (22).

5. The coking flue gas desulfurization ultra-clean emission device according to claim 4, characterized in that: The cross-sectional shape of the limiting sliding hole (29) is consistent with the cross-sectional shape of the longitudinal limiting rod (27), both being polygonal structures, and the structural dimensions of the cross-section of the limiting sliding hole (29) match the structural dimensions of the cross-section of the longitudinal limiting rod (27).

6. A coking flue gas desulfurization ultra-clean emission device according to any one of claims 2-5, characterized in that: It also includes a water pressure control mechanism (3), which is equipped with a first liquid discharge hole (34) that can divert the water flow to the first liquid docking channel (18), a movable valve plate (36) that blocks the discharge port of the first liquid discharge hole (34) and can move longitudinally, and a helical spring (39) that generates downward elastic pressure on the movable valve plate (36).

7. The coking flue gas desulfurization ultra-clean emission device according to claim 6, characterized in that: The water pressure control mechanism (3) includes a second liquid docking channel (33) that docks with the first liquid docking channel (18). A longitudinal hollow shell (31) integrally formed with the second liquid docking channel (33) is provided on one side. A longitudinal component movable cavity (32) is provided inside the longitudinal hollow shell (31). A first liquid discharge hole (34) connecting the bottom of the longitudinal hollow shell (31) to the middle cavity of the second liquid docking channel (33) is provided at the bottom of the longitudinal hollow shell (31). The top of the device is provided with a second liquid discharge hole (35) that connects the external space and the top of the longitudinal component movable cavity (32). Inside the longitudinal component movable cavity (32), there is a movable valve plate (36) that can move along the axial direction of the longitudinal component movable cavity (32). The circumferential surface of the movable valve plate (36) is provided with a concave structure and a liquid flow groove (37) for liquid flow. A helical spring (39) in a compressed state is installed above the movable valve plate (36). An annular sealing ring (38) is embedded at the bottom of the movable valve plate (36).

8. The coking flue gas desulfurization ultra-clean emission device according to claim 7, characterized in that: The thickness of the annular sealing ring (38) is greater than the depth of the embedded groove in the movable valve plate (36), the structural radius of the inner ring of the annular sealing ring (38) is greater than the structural radius of the first liquid discharge hole (34), and the structural radius of the outer ring of the annular sealing ring (38) is less than the distance between the centerline of the liquid flow groove (37) and the movable valve plate (36).

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