Blast furnace ironmaking dust removal device and working method

Abstract

The invention discloses a blast furnace ironmaking dust removal device and a working method, and belongs to the field of gas pollution treatment.The blast furnace ironmaking dust removal device comprises a shell, a partition plate fixed to the inner wall of the shell, a filter bag fixed to the lower end of the partition plate, an inlet and an outlet, the air supply unit is fixed on one side of the shell, the blowback assembly is located in the shell, the output end of the air supply unit is connected with the input end of the blowback assembly through a pipeline, and the blowback end of the blowback assembly extends into the filter bag; by adopting the design of combining the reverse blowing assembly and the reverse blowing capturing assembly, reverse blowing is carried out from the inside of the filter bag to the outside through the reverse blowing assembly, dust outside the filter bag is removed, meanwhile, negative pressure suction is carried out on the dust removed through reverse blowing through the reverse blowing capturing assembly, and the dust is forcibly taken away from the interior of the dust remover after being subjected to reverse blowing, so that not only is the dust removal efficiency higher, but also the dust removal effect is better. And high-concentration dust can be directly conveyed to a recovery device through an externally-hung negative pressure pipeline, so that the phenomena of long-term accumulation and bridging of the dust in the dust hopper are avoided.

Description

Technical Field

[0001] This invention relates to the field of gas pollution treatment, and more specifically, to a dust removal device and operating method for blast furnace ironmaking. Background Technology

[0002] Dust removal devices in blast furnace ironmaking are crucial environmental protection and energy recovery equipment in the blast furnace production system of steel plants. During the ironmaking process, blast furnaces produce a large amount of blast furnace gas, which contains a large amount of dust (such as coke powder, iron ore powder, limestone powder, etc.). Without dust removal, this gas cannot be used as fuel (it will clog pipes and damage equipment) and will also cause serious air pollution.

[0003] The purification of blast furnace gas is usually divided into two stages: coarse dust removal (gravity dust collector) and fine dust removal (bag filter). In the fine dust removal process, traditional bag filters usually adopt a bottom inlet and top outlet structure. When the pulse valve blows, although the dust is forced to detach from the filter bag and fall downwards, the main flue gas flow inside the dust collector is still moving from bottom to top. The kinetic energy of the smaller dust particles is quickly canceled out during the falling process, and then they are picked up again by the strong upward airflow and re-adsorbed onto the filter bag that was just cleaned or the adjacent filter bag. The above problems can be solved by adopting an offline dust removal solution. Offline dust removal divides the internal part of the bag filter into zones. When the filter bags in one zone are backflushed for dust removal, the air intake in that zone stops, while the other zones can continue to intake and filter normally. This method avoids small dust particles being intercepted in mid-air and re-absorbed onto the surface of the filter bags. However, when one zone is cleaned offline, the filtration velocity in the other zones will increase instantly, causing the filter bags in the other zones to be under greater load and the filtration resistance to surge. At the same time, offline dust removal requires frequent opening and closing of large switching valves. The opening and closing of valves will cause the system resistance to fluctuate. For blast furnace ironmaking, the pressure stability of the gas system is crucial. If the pressure difference of the dust collector fluctuates too much, it may affect the control of the blast furnace top pressure and even interfere with the production conditions. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a dust removal device and working method for blast furnace ironmaking.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A dust removal device for blast furnace ironmaking includes a shell, a partition plate fixed to the inner wall of the shell, a filter bag fixed to the lower end of the partition plate, and an inlet and an outlet respectively opened on both sides of the shell. It also includes an air supply unit fixed on one side of the housing and a backflush assembly located inside the housing, and the output end of the air supply unit is connected to the input end of the backflush assembly through a pipe, and the backflush end of the backflush assembly extends into the filter bag; The housing is also equipped with a backflush capture assembly, which includes a second support plate fixed inside the housing, a capture frame rotatably connected to the upper end of the second support plate, a capture chamber opened on the side of the capture frame facing the filter bag, a first flow channel opened inside the capture frame and connected to the capture chamber, and a second rotary joint fixed to the lower end of the second support plate. The inner tube of the second rotary joint is connected to the first flow channel. A negative pressure suction part is fixed to one side of the outer wall of the housing, and the input end of the negative pressure suction part is connected to the output end of the second rotary joint through a pipe.

[0007] Furthermore, the backflush assembly includes a first support plate fixed to the inner wall of the housing, a first rotary joint fixed to the upper end of the first support plate, a first hollow tube column rotatably connected to the lower end of the first support plate, a backflush plate fixed to the lower end of the first hollow tube column, and a plurality of backflush ports opened on the side of the backflush plate facing the inner wall of the filter bag, wherein the plurality of backflush ports are connected to the first hollow tube column, and the inner tube of the first rotary joint is fixedly inserted into the first hollow tube column and connected to the hollow cavity inside the first hollow tube column.

[0008] Furthermore, the partition has an opening inside, through which the first hollow tube enters the interior of the filter bag.

[0009] Furthermore, it also includes a drive assembly for synchronously rotating the backflush assembly and the backflush capture assembly. The drive assembly includes a motor fixed to the upper end of the housing, a first transmission rod whose two ends are respectively rotatably connected to the inner wall of the housing and the upper end of the first support plate, a first gear rotatably connected to the lower end of the first support plate and connected to the first transmission rod, a second gear fixedly sleeved outside the first hollow tube column and rotatably connected to the lower end of the first support plate, a fifth gear rotatably connected to the lower end of the partition plate, and a synchronization assembly that is transmissionally connected to the first gear and drives the second gear and the fifth gear to rotate synchronously. The lower end of the fifth gear is fixedly connected to the upper end of the capture frame.

[0010] Furthermore, the synchronization component includes a third gear rotatably connected to the lower end of the first support plate and meshing with the first gear and the second gear; a fourth gear rotatably connected to the lower end of the partition plate and meshing with the fifth gear; and a second transmission rod, one end of which is fixed to the lower end of the third gear and the other end of which is rotatably connected to the upper end of the partition plate. The second transmission rod is connected to the fourth gear. The exterior of the second transmission rod is connected to the partition plate through a dynamic seal, and an air outlet channel is also provided inside the partition plate. An air inlet interface communicating with the air outlet channel is provided on the back side of the housing.

[0011] Furthermore, it also includes a backflush isolation assembly, which includes a hollow pipe fixedly inserted into the lower end of the filter bag, a second air inlet opened on one side of the capture frame, a plurality of second exhaust ports opened on the side of the capture frame facing the filter bag, and a second flow channel opened inside the capture frame and connected to the second air inlet and the second exhaust ports. The upper end of the hollow pipe extends out of the filter bag and is rotatably connected to the backflush plate and connected to the backflush port, and the lower end of the hollow pipe extends out of the lower end of the filter bag and is rotatably connected to one side of the capture frame and connected to the second air inlet.

[0012] Furthermore, multiple second exhaust ports are connected to the second flow channel through a flow equalization section, and the inner wall of the second exhaust port is provided with a tapered throat, and multiple swirling flanges are fixed on the inner wall of the tapered throat.

[0013] Furthermore, the air supply unit includes an air supply section and a frame fixed to one side of the housing, a first air inlet located at the lower end of the frame and connected to the output end of the air supply section, a first air outlet located at the upper end of the frame and connected to a pipe, a resonant cavity located inside the frame, an ultrasonic transducer fixed to the inner wall of the frame, and an ultrasonic radiation plate located inside the resonant cavity and fixed to the output end of the ultrasonic transducer.

[0014] Furthermore, the capture frame has a material discharge trough inside that communicates with the capture chamber, and two material discharge channels are symmetrically opened on both sides of the capture frame and communicate with the material discharge trough. A material blocking seat is provided in the material discharge channel.

[0015] A method for operating a dust removal device for blast furnace ironmaking includes the following steps: S1. Blast furnace gas enters the lower chamber inside the shell from the inlet, and is filtered by filter bags. Dust in the gas is trapped outside the filter bags. The filtered gas passes through the opening on the partition and is discharged from the outlet. S2. The air supply unit generates a pulsed airflow with ultrasonic energy through an ultrasonic transducer and a resonant cavity. The airflow enters the back-blowing plate through the first rotary joint and the first hollow tube column, and is sprayed onto the inner wall of the filter bag from multiple back-blowing ports. The dust on the outside of the filter bag is removed by oscillation and airflow pressure. S3. The drive assembly drives the back-blowing assembly and the capture frame to rotate synchronously, so that the back-blowing port is always aligned with the capture chamber; at the same time, the negative pressure suction unit generates suction in the capture chamber, sucks the blown-down dust into the first flow channel and discharges it out of the housing through the second rotary joint. S4. Part of the airflow enters the second flow channel of the capture frame through the hollow pipe and is ejected from the second exhaust port with a swirling flange, forming an air curtain between the capture frame and the filter bag to prevent dust from escaping. At the same time, the formed swirling flow is used to pre-remove the floating dust on the surface of the filter bag.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This scheme adopts a design that combines a back-blowing component and a back-blowing capture component. The back-blowing component blows the dust from the inside of the filter bag to the outside, removing the dust from the outside of the filter bag. At the same time, the back-blowing capture component uses negative pressure to suck up the dust removed by the back-blowing. After the dust is blown down, it is forced to leave the dust collector. This not only improves the dust removal efficiency, but also allows high-concentration dust to be sent directly to the recovery device through the external negative pressure pipeline, avoiding long-term accumulation and bridging of dust in the ash hopper. Furthermore, the back-blowing component and the back-blowing capture component rotate synchronously. Each time the back-blowing capture component covers only a small vertical strip on the surface of the filter bag, this local and continuous covering has almost no impact on the pressure difference of the entire dust removal system, ensuring that the pressure of the blast furnace gas system is extremely stable. At the same time, it can also avoid increasing the load and resistance of the remaining filter bags during the dust removal process.

[0017] (2) This solution is equipped with a back-blowing isolation component. When the capture frame rotates outside the filter bag, it can spray gas to the outside of the filter bag through multiple second exhaust ports, thereby forming an air curtain between the filter bag and the capture frame. The air pressure prevents the dust in the capture chamber from escaping, and prevents the high-concentration dust blown down from slipping away from the gap and mixing with the original flue gas inside the dust collector to re-attach to the filter bag. At the same time, when the capture frame rotates, the air curtain sprayed from the edge will first sweep the surface of the filter bag. This tangential or normal high-speed airflow can play a pre-removal role on the floating dust on the surface of the filter bag, so that the back-blowing component can more easily remove the dust from the surface of the filter bag.

[0018] (3) This solution has a tapered throat and a swirling flange in the second exhaust port, which enables the gas discharged from the second exhaust port to form a swirling flow. The swirling gas generates a strong tangential shear stress on the surface of the filter bag. The swirling flow is like a rotating pneumatic scraper. The multi-dimensional force can more easily break the adhesion between dust and filter material fibers. The swirling flow mainly brushes the surface of the filter material. While ensuring the peeling kinetic energy, it reduces the impact wear on the filter material fibers, thereby extending the service life of the filter bag and avoiding the situation where fine dust penetrates deep into the filter material due to excessive direct airflow pressure (forming deep blockage).

[0019] (4) The air supply unit of this solution outputs pulsed airflow to the back-blowing component. The high-frequency oscillation can more effectively break the van der Waals forces between dust particles and the adhesion bonds between dust and filter material, so that the accumulated dust can be quickly broken and detached. At the same time, the pulsed airflow generated by the back-blowing component is also accompanied by strong sound energy. The sound waves have extremely strong penetrability and can penetrate deep into the filter material fibers, inducing the displacement of deeply embedded particles, preventing deep blockage of the filter bag. When a thick layer of dust accumulates in the lower section of the filter bag, it can also be peeled off and removed under high-frequency oscillation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a schematic diagram of the backflush capture component and drive component of the present invention; Figure 4 This is a schematic diagram of the backflush plate, backflush port, and opening structure of the present invention; Figure 5 This is a schematic diagram of the backflush isolation assembly structure of the present invention; Figure 6 Cross-sectional view of the capture frame of the present invention Figure 1 ; Figure 7 Cross-sectional view of the capture frame of the present invention Figure 2 ; Figure 8 This is a schematic diagram of the gas supply unit structure of the present invention; Figure 9 This is a cross-sectional view of the partition portion of the present invention.

[0021] Explanation of the labels in the diagram: 1. Shell; 11. Inlet; 12. Outlet; 13. Partition; 131. Opening; 132. Dynamic seal; 133. Air outlet duct; 14. Filter bag; 2. Air supply unit; 21. Air supply section; 22. Frame; 23. First air inlet; 24. First air outlet; 25. Ultrasonic radiation plate; 26. Ultrasonic transducer; 27. Resonant cavity; 3. Negative pressure suction section; 4. Backflush assembly; 41. First support plate; 42. First rotary joint; 43. First hollow tube column; 44. Backflush plate; 45. Backflush port; 5. Backflush capture assembly; 51. Second support plate 52. Second rotary joint; 53. Capture frame; 54. Capture chamber; 55. First flow channel; 56. Drop chute; 57. Discharge flow channel; 58. Blocking seat; 6. Drive assembly; 61. Motor; 62. First transmission rod; 63. First gear; 64. Second gear; 65. Third gear; 66. Second transmission rod; 67. Fourth gear; 68. Fifth gear; 7. Backflush isolation assembly; 71. Second air inlet; 72. Hollow pipe; 73. Second exhaust port; 74. Second flow channel; 75. Gradually narrowing throat; 76. Swirl flange; 77. Flow equalization section. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 9A dust removal device for blast furnace ironmaking includes a shell 1, a partition 13 fixed to the inner wall of the shell 1, a filter bag 14 fixed to the lower end of the partition 13, and an inlet 11 and an outlet 12 respectively opened on both sides of the shell 1. It also includes an air supply unit 2 fixed on one side of the housing 1 and a back-blowing assembly 4 located inside the housing 1, and the output end of the air supply unit 2 is connected to the input end of the back-blowing assembly 4 through a pipe, and the back-blowing end of the back-blowing assembly 4 extends into the filter bag 14. The housing 1 is also provided with a backflush capture assembly 5, which includes a second support plate 51 fixed inside the housing 1, a capture frame 53 rotatably connected to the upper end of the second support plate 51, a capture chamber 54 opened on the side of the capture frame 53 facing the filter bag 14, a first flow channel 55 opened inside the capture frame 53 and connected to the capture chamber 54, and a second rotary joint 52 fixed to the lower end of the second support plate 51. The inner tube of the second rotary joint 52 is connected to the first flow channel 55. A negative pressure suction part 3 is fixed to one side of the outer wall of the housing 1, and the input end of the negative pressure suction part 3 is connected to the output end of the second rotary joint 52 through a pipe.

[0024] It also includes a drive component 6 that drives the backflush assembly 4 and the backflush capture assembly 5 to rotate synchronously; The capture frame 53 has a discharge trough 56 inside that communicates with the capture chamber 54, and two discharge channels 57 are symmetrically opened on both sides of the capture frame 53 and communicate with the discharge trough 56. The discharge channels 57 are filled with a blockage seat 58. Most of the dust blown off from the filter bag 14 will be discharged from the first channel 55, and a small amount of dust may remain at the bottom of the capture chamber 54. The discharge trough 56 can be used to collect the small amount of dust remaining. The blockage seat 58 is connected to the capture frame 53 by a snap-fit ​​or bolt connection. The machine is stopped periodically, the housing 1 is opened, and the blockage seat 58 is removed from the discharge channel 57 so that the dust in the discharge trough 56 can be discharged from the discharge channel 57.

[0025] The backflush assembly 4 includes a first support plate 41 fixed to the inner wall of the housing 1, a first rotary joint 42 fixed to the upper end of the first support plate 41, a first hollow tube column 43 rotatably connected to the lower end of the first support plate 41, a backflush plate 44 fixed to the lower end of the first hollow tube column 43, and a plurality of backflush ports 45 opened on the side of the backflush plate 44 facing the inner wall of the filter bag 14, and the plurality of backflush ports 45 are connected to the first hollow tube column 43. The inner tube of the first rotary joint 42 is fixedly inserted into the interior of the first hollow tube column 43 and is connected to the hollow cavity inside the first hollow tube column 43.

[0026] The partition 13 has an opening 131 inside, through which the first hollow tube 43 passes into the interior of the filter bag 14.

[0027] By adopting the above technical solution, the partition 13 divides the interior of the shell 1 into two independent chambers. Blast furnace gas enters the lower chamber of the shell 1 from the inlet 11. After passing through the filter bag 14, the dust in the gas is trapped on the outside of the filter bag 14. The filtered gas inside the filter bag 14 is discharged from the opening 131 and enters the upper chamber, and then is discharged through the outlet 12. During normal dust removal of the gas, the gas supply unit 2 can supply gas to the first rotary joint 42. The gas enters the first hollow tube column 43 through the first rotary joint 42 and enters the back-blowing plate 44 from the first hollow tube column 43. Finally, it is discharged from multiple back-blowing ports 45 and blown towards the inner wall of the filter bag 14. By using the variable diameter pipe design (equal flow velocity method) and installing regulating valves in each back-blowing port 45 (manually adjusting the valve opening during the commissioning stage to make the flow velocity of the gas discharged from the back-blowing port 45 consistent), the gas output of multiple back-blowing ports 45 is similar. This is a mature existing technology and will not be described in detail here. Back-blowing port 45 blows air from inside the filter bag 14 outwards, blowing off the dust adhering to the outside of the filter bag 14; at the same time, the negative pressure suction unit 3 can generate suction. The negative pressure suction unit 3 adopts a large vacuum cleaner. The dust can be sucked up in the capture chamber 54 of the capture rack 53 located outside the filter bag 14 and close to the outer wall of the filter bag 14. The dust blown off the filter bag 14 enters the capture chamber 54 and enters the second rotary joint 52 along the first flow channel 55. It is discharged from the second rotary joint 52 and sucked into the negative pressure suction unit 3. The mixture of gas and dust in the negative pressure suction unit 3 can be subjected to coarse separation treatment. After coarse separation treatment, the gas is mixed with coal gas again and sent into the shell 1. The back-blowing component 4 blows the dust from the inside of the filter bag 14 to the outside, removing the dust from the outside of the filter bag 14. At the same time, the back-blowing capture component 5 uses negative pressure to suck up the dust that has been blown off. After the dust is blown off, it is forcibly carried away from the inside of the housing 1. This not only improves the dust removal efficiency, but also allows high-concentration dust to be directly sent to the recycling device through the external negative pressure pipeline, avoiding long-term accumulation and bridging of dust in the ash hopper.

[0028] like Figure 2 , Figure 3 and Figure 9 As shown, the drive assembly 6 includes a motor 61 fixed to the upper end of the housing 1, a first transmission rod 62 whose two ends are respectively rotatably connected to the inner wall of the housing 1 and the upper end of the first support plate 41, a first gear 63 rotatably connected to the lower end of the first support plate 41 and connected to the first transmission rod 62, a second gear 64 fixedly sleeved outside the first hollow tube column 43 and rotatably connected to the lower end of the first support plate 41, a fifth gear 68 rotatably connected to the lower end of the partition plate 13, and a synchronization assembly that is transmissionally connected to the first gear 63 and drives the second gear 64 and the fifth gear 68 to rotate synchronously. The lower end of the fifth gear 68 is fixedly connected to the upper end of the capture frame 53.

[0029] The synchronization component includes a third gear 65 rotatably connected to the lower end of the first support plate 41 and meshing with the first gear 63 and the second gear 64; a fourth gear 67 rotatably connected to the lower end of the partition plate 13 and meshing with the fifth gear 68; and a second transmission rod 66, one end of which is fixed to the lower end of the third gear 65 and the other end of which is rotatably connected to the upper end of the partition plate 13. The second transmission rod 66 is connected to the fourth gear 67. The second transmission rod 66 is externally connected to the partition plate 13 through a dynamic seal 132. An air outlet channel 133 is also provided inside the partition plate 13. An air inlet interface communicating with the air outlet channel 133 is provided on the back side of the housing 1.

[0030] By adopting the above technical solution, the motor 61 drives the first transmission rod 62 to rotate, the first transmission rod 62 drives the first gear 63 to rotate, the first gear 63 drives the third gear 65 and the second gear 64 to rotate, the rotation of the third gear 65 drives the fourth gear 67 to rotate via the second transmission rod 66, the rotation of the fourth gear 67 drives the fifth gear 68 to rotate, the rotation of the third gear 65 drives the second gear 64 to rotate, and the rotation of the second gear 64 and the fifth gear 68 respectively drives the first hollow tube column 43 and the capture frame 53 to rotate synchronously. Each backflushing capture component 5 only covers a small vertical strip on the surface of the filter bag 14. This localized and continuous covering has almost no impact on the pressure difference of the entire dust removal system, ensuring extremely stable pressure in the blast furnace gas system. It also avoids increasing the load and resistance of the remaining filter bags 14 during the ash removal process. The dynamic seal 132 can achieve a dynamic seal between the second drive rod 66 and the partition plate 13. At the same time, the air outlet ring channel 133 can create positive pressure between the second drive rod 66 and the partition plate 13, preventing gas in the lower chamber from leaking through the space between the second drive rod 66 and the partition plate 13.

[0031] like Figures 4 to 6 As shown, it also includes a backflush isolation assembly 7, which includes a hollow pipe 72 fixedly inserted into the center of the lower end of the filter bag 14, a second air inlet 71 opened on one side of the capture rack 53, a plurality of second exhaust ports 73 opened on the side of the capture rack 53 facing the filter bag 14, and a second flow channel 74 opened inside the capture rack 53 and connected to the second air inlet 71 and the second exhaust ports 73. The upper end of the hollow pipe 72 extends out of the filter bag 14 and is rotatably connected to the backflush plate 44 and connected to the backflush port 45, and the lower end of the hollow pipe 72 extends out of the lower end of the filter bag 14 and is rotatably connected to one side of the capture rack 53 and connected to the second air inlet 71.

[0032] By adopting the above technical solution, the upper and lower ends of the hollow pipe 72 are rotatably connected to the backflush plate 44 and the capture frame 53, respectively, to achieve the effect of rotary air delivery. Specifically, this can be achieved by combining two rotary joints. The hollow pipe 72 is equivalent to the inner tube of the two rotary joints (one end of the two inner tubes is fixedly connected and the connection is sealed). The inner tube runs through the non-filtration center blind area at the bottom of the filter bag 14, and a sealing ring is provided at this penetration point to ensure that it does not interfere with the filtration surface of the filter bag when used as a rotary support. The rotary joint bodies at the upper and lower ends of the hollow pipe 72 are fixed in the backflush plate 44 and the capture frame 53, respectively, and are connected to the backflush port 45 and the second air inlet 71. When the capture frame 53 and the backflush plate 44 rotate, the hollow pipe 72 does not rotate with it and is fixed in the filter bag 14. The air enters from the first hollow pipe column 43. The gas inside the blow plate 44 can also enter the second air inlet 71 through the hollow pipe 72, enter the second flow channel 74 through the second air inlet 71, and be discharged from multiple second exhaust ports 73 and blown to the outside of the filter bag 14. When the capture frame 53 rotates outside the filter bag 14, gas can be sprayed out of the filter bag 14 through multiple second exhaust ports 73, thereby forming an air curtain between the filter bag 14 and the capture frame 53. The air pressure prevents the dust in the capture chamber 54 from escaping, and prevents the high-concentration dust blown down from slipping away from the gap and mixing with the original flue gas inside the dust collector to re-attach to the filter bag 14. At the same time, when the capture frame 53 rotates, the air curtain sprayed from the edge will first sweep the surface of the filter bag 14. This tangential or normal high-speed airflow can play a pre-removal role on the floating dust on the surface of the filter bag 14, so that the back-blowing assembly 4 can more easily remove the dust from the surface of the filter bag 14.

[0033] like Figure 5 and Figure 7 As shown, multiple second exhaust ports 73 are connected to the second flow channel 74 through the flow equalization section 77, and the inner wall of the second exhaust port 73 is provided with a tapered throat 75, and multiple swirling flanges 76 are fixed on the inner wall of the tapered throat 75.

[0034] By adopting the above technical solution, the function of the flow equalization section 77 (which can be the regulating valve mentioned above) is to make the air output of multiple second exhaust ports 73 consistent; the tapered throat 75 (the principle is the same as the throat principle of a venturi tube) and the swirling flange 76 can make the gas discharged from the second exhaust port 73 form a swirling flow. The swirling gas generates a strong tangential shear stress on the surface of the filter bag 14. The swirling flow is like a rotating pneumatic scraper. The multi-dimensional force can more easily break the adhesion between dust and filter material fibers; at the same time, the swirling flow mainly brushes the surface of the filter material. While ensuring the peeling kinetic energy, it reduces the impact wear on the filter material fibers, thereby extending the service life of the filter bag 14 and avoiding the situation where fine dust penetrates deep into the filter material due to excessive direct airflow pressure (forming deep blockage).

[0035] like Figure 1 and Figure 8 As shown, the air supply unit 2 includes an air supply section 21 and a frame 22 fixed to one side of the housing 1, a first air inlet 23 opened at the lower end of the frame 22 and connected to the output end of the air supply section 21, a first air outlet 24 opened at the upper end of the frame 22 and connected to a pipe, a resonant cavity 27 opened inside the frame 22, an ultrasonic transducer 26 fixed on the inner wall of the frame 22, and an ultrasonic radiation plate 25 located inside the resonant cavity 27 and fixed to the output end of the ultrasonic transducer 26.

[0036] By adopting the above technical solution, the gas supply unit 21 pumps gas into the resonant cavity 27 through the first air inlet 23. After entering the resonant cavity 27 from the first air inlet 23, the gas first contacts the ultrasonic radiation plate 25, and then the gas is forced to flow along the gap between the ultrasonic radiation plate 25 and the inner wall of the resonant cavity 27, entering the resonant cavity 27. This design can play a certain rectification role, making the airflow distribution into the resonant cavity 27 more uniform and avoiding high-speed airflow directly impacting the resonant area and causing turbulence. The ultrasonic transducer 26 is responsible for converting electrical energy into high-frequency mechanical vibration. Since the ultrasonic transducer 26 is physically connected to the ultrasonic radiation plate 25, the ultrasonic radiation plate 25 will reciprocate at high frequency along with the ultrasonic transducer 26. The ultrasonic radiation plate 25 has a large flatness. The gas in the surface contact resonant cavity 27, like the diaphragm of a loudspeaker, radiates mechanical vibration energy into the gas medium efficiently by pushing and pulling the air, forming an ultrasonic sound field. The gas in the resonant cavity 27 is discharged through the first air outlet 24 and enters the first rotary joint 42. By outputting pulsed airflow to the backflush assembly 4, high-frequency oscillation can more effectively break the van der Waals forces between dust particles and the adhesive bonds between dust and filter material, causing the accumulated dust to break up and detach quickly. At the same time, the pulsed airflow generated by the backflush assembly 4 is also accompanied by strong sound energy. The sound waves have extremely strong penetrability and can penetrate deep into the filter material fibers, inducing the displacement of deeply embedded particles and preventing deep clogging of the filter bag 14. When a thick layer of dust accumulates in the lower section of the filter bag 14, it can also be peeled off and removed under high-frequency oscillation.

[0037] Usage: The partition 13 divides the interior of the shell 1 into two independent chambers. Blast furnace gas enters the lower chamber of the shell 1 through the inlet 11. After passing through the filter bag 14, the dust in the gas is trapped on the outside of the filter bag 14. The filtered gas inside the filter bag 14 is discharged from the opening 131 and enters the upper chamber, and then is discharged through the outlet 12. The gas supply unit 2 can supply pulsed airflow to the first rotary joint 42. The pulsed airflow enters the first hollow tube column 43 through the first rotary joint 42, and then enters the back-blowing plate 44 from the first hollow tube column 43. Finally, it is discharged from multiple back-blowing ports 45 and blown towards the inner wall of the filter bag 14. The back-blowing ports 45 blow air from the inside of the filter bag 14 to the outside, blowing off the dust attached to the outside of the filter bag 14. At the same time, the negative pressure suction unit 3 can generate suction, and the capture rack 53 located outside the filter bag 14 and close to the outer wall of the filter bag 14 captures the dust. Dust can be sucked up in the capture chamber 54. Dust blown off the filter bag 14 enters the capture chamber 54 and enters the second rotary joint 52 through the first flow channel 55. It is discharged from the second rotary joint 52 and sucked into the negative pressure suction part 3. The operation of the drive component 6 can drive the first hollow tube column 43 and the capture frame 53 to rotate synchronously, realizing the synchronous rotation of the back-blowing component 4 and the back-blowing capture component 5. The gas entering the back-blowing plate 44 from the first hollow tube column 43 can also enter the second air inlet 71 through the hollow pipe 72, enter the second flow channel 74 through the second air inlet 71, and be discharged from multiple second exhaust ports 73 and blown to the outside of the filter bag 14. When the capture frame 53 rotates outside the filter bag 14, gas can be sprayed to the outside of the filter bag 14 through multiple second exhaust ports 73, thereby forming an air curtain between the filter bag 14 and the capture frame 53.

[0038] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A dust removal device for blast furnace ironmaking, comprising a shell (1), a partition (13) fixed to the inner wall of the shell (1), a filter bag (14) fixed to the lower end of the partition (13), an inlet (11) and an outlet (12) respectively opened on both sides of the shell (1), characterized in that: It also includes an air supply unit (2) fixed on one side of the housing (1) and a backflush assembly (4) located inside the housing (1), and the output end of the air supply unit (2) is connected to the input end of the backflush assembly (4) through a pipe, and the backflush end of the backflush assembly (4) extends into the filter bag (14); The housing (1) is also provided with a backflush capture assembly (5), and the backflush capture assembly (5) includes a second support plate (51) fixed inside the housing (1), a capture frame (53) rotatably connected to the upper end of the second support plate (51), a capture chamber (54) opened on the side of the capture frame (53) facing the filter bag (14), a first flow channel (55) opened inside the capture frame (53) and connected to the capture chamber (54), and a second rotary joint (52) fixed at the lower end of the second support plate (51), and the inner tube of the second rotary joint (52) is connected to the first flow channel (55). A negative pressure suction part (3) is fixed to one side of the outer wall of the housing (1), and the input end of the negative pressure suction part (3) is connected to the output end of the second rotary joint (52) through a pipe.

2. The dust removal device for blast furnace ironmaking according to claim 1, characterized in that: The backflush assembly (4) includes a first support plate (41) fixed to the inner wall of the housing (1), a first rotary joint (42) fixed to the upper end of the first support plate (41), a first hollow tube column (43) rotatably connected to the lower end of the first support plate (41), a backflush plate (44) fixed to the lower end of the first hollow tube column (43), and multiple backflush ports (45) opened on the side of the backflush plate (44) facing the inner wall of the filter bag (14), and the multiple backflush ports (45) are connected to the first hollow tube column (43). The inner tube of the first rotary joint (42) is fixedly inserted into the interior of the first hollow tube column (43) and is connected to the hollow cavity inside the first hollow tube column (43).

3. The dust removal device for blast furnace ironmaking according to claim 2, characterized in that: The partition (13) has an opening (131) inside, through which the first hollow tube (43) passes into the interior of the filter bag (14).

4. The dust removal device for blast furnace ironmaking according to claim 3, characterized in that: It also includes a drive assembly (6) that drives the backflush assembly (4) and the backflush capture assembly (5) to rotate synchronously. The drive assembly (6) includes a motor (61) fixed to the upper end of the housing (1), a first transmission rod (62) whose two ends are respectively rotatably connected to the inner wall of the housing (1) and the upper end of the first support plate (41), a first gear (63) rotatably connected to the lower end of the first support plate (41) and connected to the first transmission rod (62), a second gear (64) fixedly sleeved on the outside of the first hollow tube column (43) and rotatably connected to the lower end of the first support plate (41), a fifth gear (68) rotatably connected to the lower end of the partition plate (13), and a synchronization assembly that is driven by the first gear (63) and drives the second gear (64) and the fifth gear (68) to rotate synchronously. The lower end of the fifth gear (68) is fixedly connected to the upper end of the capture frame (53).

5. A dust removal device for blast furnace ironmaking according to claim 4, characterized in that: The synchronization component includes a third gear (65) rotatably connected to the lower end of the first support plate (41) and meshing with the first gear (63) and the second gear (64); a fourth gear (67) rotatably connected to the lower end of the partition plate (13) and meshing with the fifth gear (68); and a second transmission rod (66) with one end fixed to the lower end of the third gear (65) and the other end rotatably connected to the upper end of the partition plate (13). The second transmission rod (66) is connected to the fourth gear (67). The second transmission rod (66) is connected to the partition plate (13) through a dynamic seal (132). An air outlet channel (133) is also provided inside the partition plate (13). An air inlet interface connected to the air outlet channel (133) is provided on the back side of the housing (1).

6. A dust removal device for blast furnace ironmaking according to claim 5, characterized in that: It also includes a backflush isolation assembly (7), and the backflush isolation assembly (7) includes a hollow pipe (72) fixedly inserted into the center of the lower end of the filter bag (14), a second air inlet (71) opened on one side of the capture rack (53), a plurality of second exhaust ports (73) opened on the side of the capture rack (53) facing the filter bag (14), and a second flow channel (74) opened inside the capture rack (53) and connected to the second air inlet (71) and the second exhaust port (73). The upper end of the hollow pipe (72) extends out from the filter bag (14) and is rotatably connected to the backflush plate (44) and connected to the backflush port (45). The lower end of the hollow pipe (72) extends out from the lower end of the filter bag (14) and is rotatably connected to one side of the capture rack (53) and connected to the second air inlet (71).

7. A dust removal device for blast furnace ironmaking according to claim 6, characterized in that: Multiple second exhaust ports (73) are connected to the second flow channel (74) through the flow equalization section (77), and the inner wall of the second exhaust port (73) is provided with a tapered throat (75), and multiple swirling flanges (76) are fixed on the inner wall of the tapered throat (75).

8. A dust removal device for blast furnace ironmaking according to claim 7, characterized in that: The gas supply unit (2) includes a gas supply section (21) and a frame (22) fixed on one side of the housing (1), a first air inlet (23) opened at the lower end of the frame (22) and connected to the output end of the gas supply section (21), a first air outlet (24) opened at the upper end of the frame (22) and connected to the pipeline, a resonant cavity (27) opened inside the frame (22), an ultrasonic transducer (26) fixed on the inner wall of the frame (22), and an ultrasonic radiation plate (25) located inside the resonant cavity (27) and fixed to the output end of the ultrasonic transducer (26).

9. A dust removal device for blast furnace ironmaking according to claim 8, characterized in that: The capture frame (53) has a material drop chute (56) inside that communicates with the capture chamber (54), and two material discharge channels (57) are symmetrically opened on both sides of the capture frame (53) and communicate with the material drop chute (56). A material blockage seat (58) is provided in the material discharge channel (57).

10. A method for operating a dust removal device for blast furnace ironmaking, employing the dust removal device for blast furnace ironmaking as described in claim 9, characterized in that: Includes the following steps: S1. Blast furnace gas enters the lower chamber of the shell (1) through the inlet (11), and is filtered by the filter bag (14). The dust in the gas is trapped outside the filter bag (14). The filtered gas passes through the opening (131) on the partition (13) and is discharged from the outlet (12). S2, the air supply unit (2) generates a pulsed airflow with ultrasonic energy through the ultrasonic transducer (26) and resonant cavity (27). The airflow enters the back-blowing plate (44) through the first rotary joint (42) and the first hollow tube column (43), and is sprayed onto the inner wall of the filter bag (14) from multiple back-blowing ports (45). The dust outside the filter bag (14) is removed by oscillation and airflow pressure. S3, the drive assembly (6) drives the back-blowing assembly (4) and the capture frame (53) to rotate synchronously, so that the back-blowing port (45) and the capture chamber (54) are always aligned; at the same time, the negative pressure suction part (3) generates suction in the capture chamber (54), sucks the blown-down dust into the first flow channel (55) and discharges it out of the housing (1) through the second rotary joint (52); S4. Part of the airflow enters the second flow channel (74) of the capture frame (53) through the hollow pipe (72) and is ejected from the second exhaust port (73) with the swirling flange (76), forming an air curtain between the capture frame (53) and the filter bag (14) to prevent dust from escaping. At the same time, the swirling flow is used to pre-strip the floating dust on the surface of the filter bag (14).

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