Blast furnace dust collector

Abstract

The present application relates to the technical field of metallurgy, in particular to a blast furnace dust collector, which comprises a dust collector, a main dust discharging pipe is fixedly connected to the bottom flange of the dust collector, a dust discharging port is arranged symmetrically on the dust collector corresponding to the position above the main dust discharging pipe, a communication auxiliary dust discharging pipe is fixedly connected to the dust discharging port, and the other end of the auxiliary dust discharging pipe is communicated with the main dust discharging pipe, a ball valve is fixedly installed on the auxiliary dust discharging pipe, and the dust collector is back-flushed for about 1 min by using high-pressure pulse, so that the dusting ash which is not discharged in the dust collector is redistributed with airflow, then the dust discharging port is continuously opened to discharge the ash until no dusting ash is discharged, and the above operation is repeated until the clogging port is opened, the dusting ash in the dust collector is discharged in time during the blast furnace production, the effect of avoiding the non-planned blowdown of the blast furnace caused by clogging and avoiding the safety hidden trouble caused by the high pressure in the dust collector is achieved.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a blast furnace dust collector. Background Technology

[0002] A blast furnace is a metallurgical equipment mainly used to produce pig iron. It typically consists of a vertical cylindrical structure with a feed inlet at the top and an iron tapping outlet and slag discharge outlet at the bottom. Inside the blast furnace, raw materials such as iron ore, coke, and limestone are heated to high temperatures, producing a reduction reaction that reduces the iron element in the iron ore into pig iron. It is one of the most important pieces of equipment in the modern steel industry.

[0003] Currently, dust removal methods for blast furnace gas generally include two-stage dust collection: primary dust collection is gravity dust collection or cyclone dust collection, and secondary dust collection is baghouse dust collection or wet dust collection. Primary dust collection mainly removes coarse dust from the gas. This coarse dust accumulates continuously at the bottom of the dust collector during blast furnace operation. Because a cleaning valve is installed at the ash discharge port at the bottom of the dust collector, when the accumulated dust reaches a certain amount, the cleaning valve is opened, allowing the dust to be discharged outside the dust collector through the ash discharge port.

[0004] However, blast furnace gas contains a certain amount of moisture. When the moisture content of the raw materials fed into the blast furnace increases, the moisture content in the gas also increases. When dust with high moisture content accumulates at the bottom of the dust collector, it easily adheres to the wall surface, causing blockage of the ash discharge hole of the primary dust collector. After the ash discharge hole is blocked, the dust cannot be discharged in time, causing the gas pressure in the pipeline to rise, creating a safety hazard. Therefore, when the ash discharge hole is blocked, the blast furnace generally needs to shut down to deal with the blockage, resulting in reduced blast furnace production and hindering production operations. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that when the ash discharge hole is blocked, the dust cannot be discharged in time, which causes the gas pressure in the pipeline to rise, creating a safety hazard. It is necessary to shut down the furnace to deal with the blockage of the ash discharge hole, resulting in reduced blast furnace production and being detrimental to production operations.

[0006] To solve the above-mentioned technical problems, the present invention provides a blast furnace dust collector, including a dust collector; a main ash discharge pipe is fixedly connected to the bottom flange of the dust collector; the dust collector has symmetrically arranged ash discharge ports at positions corresponding to the main ash discharge pipe; a connecting auxiliary ash discharge pipe is fixedly connected to each ash discharge port, and the other end of the auxiliary ash discharge pipe is connected to the main ash discharge pipe; a ball valve is fixedly installed on each auxiliary ash discharge pipe; and a nitrogen blowing pipe is fixedly installed on each position of the dust collector corresponding to the ash discharge port.

[0007] In one embodiment of the present invention, a conical cloth is provided inside the dust collector at a position corresponding to the position below the ash discharge port, and the upper end of the conical cloth is fixedly connected to the side wall of the dust collector; the main ash discharge pipe is L-shaped; a round rod is slidably connected inside the main ash discharge pipe; a discharge port is opened at the bottom of the conical cloth; multiple circumferentially arrayed ropes are fixedly connected at the discharge port, and the other end of each rope is fixedly connected to the top of the round rod.

[0008] In one embodiment of the present invention, a square rod is fixedly connected to the bottom of the round rod; multiple teeth are fixedly connected to the square rod; a motor is provided at the bottom of the dust collector corresponding to the position of the uppermost tooth; a drive gear is fixedly connected to the output end of the motor, and the drive gear meshes with the teeth; the drive gear is a toothed gear, and the circumference of the drive gear is the same as the length of the square rod.

[0009] In one embodiment of the present invention, a vibrating ruler is fixedly connected to both the auxiliary ash discharge pipe and the main ash discharge pipe at the position where they communicate; a striking block corresponding to the vibrating ruler is fixedly connected to the position above the vibrating ruler on the round rod; the vibrating ruler is located above the center line of the auxiliary ash discharge pipe.

[0010] In one embodiment of the present invention, a first fixing block is provided at a position below the auxiliary ash discharge pipe corresponding to the main ash discharge pipe; a circumferential array of connecting rods is fixedly connected to the outer surface of the first fixing block, and the other end of each connecting rod is fixedly connected to the main ash discharge pipe; a rectangular cut is provided on the side of the round rod; a rectangular slider is fixedly connected to the fixing block at a position corresponding to the rectangular cut, and the rectangular slider is slidably connected within the rectangular cut; a second fixing block is fixedly connected to the bottom of the main ash discharge pipe at a position corresponding to the round rod, and the round rod is slidably connected within the second fixing block.

[0011] In one embodiment of the present invention, the distance between the center of the ash discharge port and the bottom of the dust collector is 1.5m-2.5m, and the diameter of the ash discharge port is 150mm-200mm.

[0012] In one embodiment of the present invention, the diameter of the nitrogen blowing pipe is 10-30 mm; the angle between the center line of the nitrogen blowing pipe and the center line of the ash discharge port is 30°-60°, and the output end of the nitrogen blowing pipe is inclined downward.

[0013] In one embodiment of the present invention, the nitrogen flow rate of the nitrogen blowing pipe is 10 Nm3 / min.

[0014] In one embodiment of the present invention, a filter screen is fixedly connected to the output end of the nitrogen blowing pipe, and the pore size of the filter screen is 1mm.

[0015] In one embodiment of the present invention, the method of using the dust collector includes the following steps:

[0016] S1: First, open the ball valve on one side of the auxiliary ash discharge pipe to discharge the dust from the ash discharge hole, the auxiliary ash discharge pipe and the main ash discharge pipe;

[0017] S2: When no dust is flowing out, close the ball valve on this auxiliary ash discharge pipe, open the ball valve on the other auxiliary ash discharge pipe, and continue to discharge ash. After the ash discharge is completed, close all ball valves.

[0018] S3: Open the nitrogen blow pipe and backflush nitrogen into the dust collector so that the dust can be redistributed inside the dust collector along with the airflow.

[0019] S4: Repeat the operations of S1, S2 and S3 until no more dust is discharged.

[0020] The technical solution of the present invention has the following advantages compared with the prior art:

[0021] The blast furnace dust collector of this invention, when the bottom of the dust collector is blocked, first opens the ball valve of the auxiliary ash discharge hole on one side to discharge ash. The dust flows out through the ash discharge hole, the auxiliary ash discharge pipe and the main ash discharge pipe. When no dust flows out of the ash discharge hole on that side, the ball valve of that ash discharge hole is closed. Then the ball valve of the ash discharge hole on the other side is opened to continue discharging ash until no dust flows out. Then the ball valve on that side is closed. Subsequently, the nitrogen blowing pipes on both sides are opened, and the nitrogen flow rate is set to 10 Nm3 / min. High-pressure pulse blowing is used to back-blown the dust collector for about 1 minute, so that the dust that has not been discharged in the dust collector is redistributed with the airflow. Then the ash discharge hole is opened to continue discharging ash until no dust is discharged. The above operation is repeated until the blockage is cleared. This achieves the purpose of timely discharge of dust in the dust collector during blast furnace production, and avoids the blockage that may cause unplanned blast furnace shutdown and the safety hazards caused by excessive pressure in the dust collector.

[0022] The blast furnace dust collector of this invention uses an upward sliding rod to move a conical cloth upward via a rope. At this time, the dust adhering to the surface of the conical cloth is pushed to the output end of the nitrogen blowpipe. The dust can then be redistributed inside the dust collector along with the airflow from the nitrogen blowpipe. Simultaneously, during the upward movement of the conical cloth, because it is positioned below the ash discharge port, the dust automatically enters the auxiliary ash discharge pipe from the ash discharge port, thus cleaning the dust at the bottom of the collector.

[0023] The blast furnace dust collector of this invention uses a motor to drive a drive gear to rotate, which in turn drives a toothed square rod to move up and down. The square rod then drives a round rod to move up and down, thus automatically moving a conical cloth up and down. This simplifies the operation for workers. Furthermore, because the drive gear is a toothed gear, when it loses engagement with the teeth, the disengaged square rod quickly descends, causing the conical cloth to quickly reset. At this point, the conical cloth vibrates under its elasticity, shaking off the dust collected on its surface. This process is repeated, resulting in better dust removal.

[0024] The blast furnace dust collector of this invention involves a round rod that rapidly descends, causing a striking block to fall as well. The impact force exerted by the striking block on the vibrating teeth causes the vibrating fins to vibrate rapidly. During this vibration, the vibration is transmitted to the auxiliary ash discharge pipe because the fins are fixedly connected to it. This vibration causes the dust inside the auxiliary ash discharge pipe to fall rapidly, improving the flowability of the auxiliary ash discharge pipe and preventing the accumulation of a large amount of dust inside, which could lead to blockage. Attached Figure Description

[0025] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 This is a cross-sectional view of the present invention;

[0028] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 yes Figure 2 A magnified view of a section at point B in the middle;

[0030] Figure 5 This is a top view of the present invention;

[0031] Figure 6 This is a three-dimensional view of the flapping wing structure in this invention;

[0032] Figure 7 This is a perspective view of the driving gear in this invention;

[0033] Figure 8 This is a flowchart of the present invention;

[0034] Explanation of reference numerals in the accompanying drawings: 1. Dust collector; 2. Main ash discharge pipe; 3. Auxiliary ash discharge pipe; 4. Ball valve; 5. Nitrogen blowpipe; 6. Filter screen; 7. Ash discharge port; 8. Conical cloth; 9. Round rod; 91. Rope; 92. Discharge port; 10. Square rod; 11. Tooth; 12. Motor; 13. Drive gear; 14. First fixing block; 15. Connecting rod; 16. Rectangular notch; 161. Rectangular slider; 17. Vibrating ruler; 18. Striking block; 19. Second fixing block. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0036] Please see Figure 1 - Figure 8 This invention provides a blast furnace dust collector, including a dust collector 1; a main ash discharge pipe 2 is fixedly connected to the bottom flange of the dust collector 1; the dust collector 1 has symmetrically arranged ash discharge ports 7 at positions above the main ash discharge pipe 2; a connected auxiliary ash discharge pipe 3 is fixedly connected to the ash discharge port 7, and the other end of the auxiliary ash discharge pipe 3 is connected to the main ash discharge pipe 2; a ball valve 4 is fixedly installed on each of the auxiliary ash discharge pipes 3; and a nitrogen blowing pipe 5 is fixedly installed on each of the dust collector 1 at positions corresponding to the ash discharge ports 7. To ensure timely discharge of dust from the dust collector 1 during blast furnace production, thus preventing unplanned blast furnace shutdowns due to blockages and avoiding safety hazards caused by excessive pressure within the dust collector, when blockage occurs at the bottom of the dust collector 1, first open the ball valve 4 of the auxiliary ash discharge hole on one side to discharge ash. The dust flows out through the ash discharge hole, auxiliary ash discharge pipe 3, and main ash discharge pipe 2. When no dust flows out of the ash discharge hole on that side, close the ball valve 4 of that side's ash discharge hole. Then open the ball valve 4 of the ash discharge hole on the other side and continue discharging ash until no more dust flows out. Then close the ball valve 4 on that side. Subsequently, open the nitrogen blowpipes 5 on both sides, setting the nitrogen flow rate to 10 Nm3 / min, and use a high-pressure pulse method to backflush the dust collector 1 for about 1 minute, causing the dust that has not been discharged from the dust collector 1 to redistribute with the airflow. Then continue to open the ash discharge hole to discharge ash until no more dust is discharged. Repeat the above operation until the blockage is cleared.

[0037] Furthermore, such as Figure 1 and Figure 2As shown, a conical cloth 8 is provided inside the dust collector 1 at a position below the ash discharge port 7, and the upper end of the conical cloth 8 is fixedly connected to the side wall of the dust collector 1; the main ash discharge pipe 2 is L-shaped; a round rod 9 is slidably connected inside the main ash discharge pipe 2; a discharge port 92 is opened at the bottom of the conical cloth 8; multiple circumferentially arrayed ropes 91 are fixedly connected to the discharge port 92, and the other end of each rope 91 is fixedly connected to the top of the round rod 9. Because the dust accumulates at the bottom of the dust collector 1, the airflow of the nitrogen blowpipe 5 is poor, and the dust located below the auxiliary ash discharge pipe 3 is difficult to be discharged from the auxiliary ash discharge pipe 3. In actual use, by sliding the round rod 9 upward, the round rod 9 drives the conical cloth 8 upward through the rope 91. At this time, the dust adhering to the surface of the conical cloth 8 is pushed to the output end of the nitrogen blowpipe 5. The dust can be redistributed inside the dust collector 1 with the airflow of the nitrogen blowpipe 5. At the same time, during the process of the conical cloth 8 being pushed up, since the conical cloth 8 is located below the ash discharge port 7, the dust automatically enters the auxiliary ash discharge pipe 3 from the ash discharge port 7 during the process of the conical cloth 8 being pushed up, so as to achieve the purpose of cleaning the dust at the bottom of the collector.

[0038] Furthermore, such as Figure 7 As shown, a square rod 10 is fixedly connected to the bottom of the round rod 9; multiple teeth 11 are fixedly connected to the square rod 10; a motor 12 is installed at the bottom of the dust collector 1 corresponding to the position of the uppermost tooth 11; a drive gear 13 is fixedly connected to the output end of the motor 12, and the drive gear 13 meshes with the teeth 11; the drive gear 13 is a toothed gear, and the circumference of the drive gear 13 is the same as the length of the square rod 10. To achieve the automatic sliding of the round rod 9, during operation, the motor 12 drives the drive gear 13 to rotate, which in turn drives the square rod 10, which is fixed with teeth 11, to move up and down. The square rod 10 then drives the round rod 9 to move up and down, thus automatically moving the conical cloth 8 up and down. This simplifies the operation for the operator. At the same time, since the drive gear 13 is a toothed gear, when the drive gear 13 loses mesh with the teeth 11, the square rod 10 quickly descends, causing the conical cloth 8 to quickly reset. At this time, the conical cloth 8 vibrates under the action of elasticity, shaking off the dust collected on the surface of the conical cloth 8. This process is repeated, resulting in a better dust removal effect.

[0039] Furthermore, such as Figure 2 and Figure 3As shown, a vibrating ruler 17 is fixedly connected to both the auxiliary ash discharge pipe 3 and the main ash discharge pipe 2. A striking block 18, corresponding to the vibrating ruler 17, is fixedly connected to the position above the round rod 9. The vibrating ruler 17 is located above the center line of the auxiliary ash discharge pipe 3. To improve the falling effect of the collected dust in the auxiliary ash discharge pipe 3, the round rod 9, when falling rapidly, drives the striking block 18 to fall rapidly as well. At this time, the impact force applied to the vibrating teeth by the striking block 18 causes the vibrating wings to shake rapidly. During the shaking process, since the vibrating wings are fixedly connected to the auxiliary ash discharge pipe 3, the shaking generated by the vibrating wings is transmitted to the auxiliary ash discharge pipe 3. This vibration causes the collected dust inside the auxiliary ash discharge pipe 3 to fall rapidly, improving the flowability of the auxiliary ash discharge pipe 3.

[0040] Furthermore, such as Figure 2 and Figure 3 As shown, a first fixing block 14 is provided at the position below the auxiliary ash discharge pipe 3 corresponding to the main ash discharge pipe 2; a circular array of connecting rods 15 is fixedly connected to the outer surface of the first fixing block 14, and the other end of each connecting rod 15 is fixedly connected to the main ash discharge pipe 2; a rectangular cutout 16 is provided on the side of the round rod 9; a rectangular slider 161 is fixedly connected to the fixing block at the position corresponding to the rectangular cutout 16, and the rectangular slider 161 is slidably connected within the rectangular cutout 16; a second fixing block 19 is fixedly connected to the bottom of the main ash discharge pipe 2 at the position corresponding to the round rod 9, and the round rod 9 is slidably connected within the second fixing block 19. To prevent the round rod 9 from deflecting during its up-and-down sliding, which would prevent the teeth 11 from meshing with the drive gear 13, the first fixing block 14 and the second fixing block 19 limit and fix the upper and lower sides of the round rod 9 during operation. This ensures the stability of the round rod 9 during its up-and-down movement. Under the action of the rectangular cutout 16 and the rectangular slider 161, the round rod 9 is limited to the first fixing block 14 and cannot deflect, thus preventing the drive gear 13 and the teeth 11 from losing mesh and ensuring the normal operation of the equipment.

[0041] Furthermore, such as Figure 2 As shown, the distance between the center of the ash discharge port 7 and the bottom of the dust collector 1 is 1.5m-2.5m, and the diameter of the ash discharge port 7 is 150mm-200mm.

[0042] Furthermore, such as Figure 2 As shown, the diameter of the nitrogen blowing pipe 5 is 10-30mm; the angle between the center line of the nitrogen blowing pipe 5 and the center line of the ash discharge port 7 is 30°-60°, and the output end of the nitrogen blowing pipe 5 is inclined downward.

[0043] Furthermore, such as Figure 2 As shown, the nitrogen flow rate of the nitrogen blowing pipe 5 is 10 Nm3 / min.

[0044] Furthermore, such as Figure 2As shown, each output end of the nitrogen blowpipe 5 is fixedly equipped with a filter screen 6, and the pore size of the filter screen 6 is 1mm. Installing a filter screen with a 1mm pore size on the blowpipe nozzle can prevent dust from entering the blowpipe and avoid reducing the effectiveness of the nitrogen blowpipe 5.

[0045] Furthermore, such as Figure 8 As shown, the method of using the dust collector includes the following steps:

[0046] S1: First, open the ball valve 4 on one side of the auxiliary ash discharge pipe 3 to discharge the dust from the ash discharge hole, the auxiliary ash discharge pipe 3 and the main ash discharge pipe 2;

[0047] S2: When no dust is flowing out, close the ball valve 4 on the auxiliary ash discharge pipe 3, open the ball valve 4 on the other auxiliary ash discharge pipe 3, and continue to discharge ash. After the ash discharge is completed, close all ball valves 4.

[0048] S3: Open the nitrogen blow pipe 5 and backflush nitrogen into the dust collector 1 so that the dust can be redistributed inside the dust collector 1 along with the airflow.

[0049] S4: Repeat the operations of S1, S2 and S3 until no more dust is discharged.

[0050] Working principle:

[0051] When the bottom of dust collector 1 becomes blocked, first open the ball valve 4 of the auxiliary ash discharge hole on one side to discharge ash. The dust will flow out through the ash discharge hole, the auxiliary ash discharge pipe 3 and the main ash discharge pipe 2. When no dust flows out of the ash discharge hole on that side, close the ball valve 4 of the ash discharge hole on that side. Then open the ball valve 4 of the ash discharge hole on the other side and continue to discharge ash until no dust flows out. Then close the ball valve 4 on that side. Then open the nitrogen blow pipes 5 on both sides and set the nitrogen flow rate to 10 Nm3 / min. Use high-pressure pulse to back-blow the dust collector 1 for about 1 minute to redistribute the dust that has not been discharged in the dust collector 1 with the airflow. Then continue to open the ash discharge hole to discharge ash until no dust is discharged. Repeat the above operation until the blockage is cleared. This achieves the purpose of timely discharge of dust in dust collector 1 during blast furnace production, avoids blockage that could cause unplanned blast furnace shutdown, and avoids excessive pressure in the dust collector that could lead to safety hazards.

[0052] By sliding the round rod 9 upward, the round rod 9 drives the conical cloth 8 upward through the rope 91. At this time, the dust adhering to the surface of the conical cloth 8 is pushed to the output end of the nitrogen blowpipe 5. The dust can be redistributed inside the dust collector 1 with the airflow of the nitrogen blowpipe 5. At the same time, during the process of the conical cloth 8 being pushed up, since the conical cloth 8 is located below the ash discharge port 7, the dust automatically enters the auxiliary ash discharge pipe 3 from the ash discharge port 7 during the process of the conical cloth 8 being pushed up, so as to achieve the purpose of cleaning the dust at the bottom of the integrator. This solves the problem that the dust in the dust collector 1 accumulates at the bottom, resulting in poor airflow effect of the nitrogen blowpipe 5, and that the dust located below the auxiliary ash discharge pipe 3 is difficult to be discharged from the auxiliary ash discharge pipe 3.

[0053] The motor 12 drives the drive gear 13 to rotate, which in turn drives the square rod 10, which is fixed with teeth 11, to move up and down. The square rod 10 then drives the round rod 9 to move up and down, thus realizing the automatic up and down movement of the conical cloth 8. This simplifies the operation for the operator. At the same time, since the drive gear 13 is a toothed gear, when the drive gear 13 loses mesh with the teeth 11, the square rod 10 quickly descends, and the conical cloth 8 quickly resets. At this time, the conical cloth 8 vibrates under the action of elasticity, shaking off the dust collected on the surface of the conical cloth 8. This process is repeated, resulting in a better dust removal effect.

[0054] When the round rod 9 falls rapidly, it drives the striking block 18 to fall rapidly. At this time, the impact force applied to the vibrating teeth by the striking block 18 causes the vibrating wings to vibrate rapidly. During the vibration process, since the vibrating wings are fixed to the auxiliary ash discharge pipe 3, the vibration generated by the vibrating wings is transmitted to the auxiliary ash discharge pipe 3. At this time, the auxiliary ash discharge pipe 3 vibrates, causing the dust inside the auxiliary ash discharge pipe 3 to fall rapidly, making the flow of the auxiliary ash discharge pipe 3 better.

[0055] The first fixing block 14 and the second fixing block 19 limit and fix the upper and lower sides of the round rod 9 to ensure the stability of the round rod 9 during the up and down movement. Under the action of the rectangular cut 16 and the rectangular slider 161, the round rod 9 is limited to the first fixing block 14 and cannot deflect, thus avoiding the loss of meshing between the drive gear 13 and the teeth 11 and ensuring the normal operation of the equipment.

[0056] Obviously, the above embodiments are merely illustrative examples for clarity and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A blast furnace dust collector, characterized in that: The system includes a dust collector (1); a main ash discharge pipe (2) is fixedly connected to the bottom flange of the dust collector (1); the dust collector (1) has symmetrically arranged ash discharge ports (7) at the position above the main ash discharge pipe (2); a connecting auxiliary ash discharge pipe (3) is fixedly connected to the ash discharge port (7), and the other end of the auxiliary ash discharge pipe (3) is connected to the main ash discharge pipe (2); ball valves (4) are fixedly installed on each of the auxiliary ash discharge pipes (3); nitrogen blowing pipes (5) are fixedly installed on each of the dust collectors (1) at the position corresponding to the ash discharge port (7). A conical cloth (8) is provided inside the dust collector (1) at a position below the ash discharge port (7), and the upper end of the conical cloth (8) is fixed to the side wall of the dust collector (1); the main ash discharge pipe (2) is L-shaped; a round rod (9) is slidably connected inside the main ash discharge pipe (2); a discharge port (92) is opened at the bottom of the conical cloth (8); multiple circumferentially arrayed ropes (91) are fixed at the discharge port (92), and the other end of each rope (91) is fixed to the top of the round rod (9); A square rod (10) is fixedly connected to the bottom of the round rod (9); multiple teeth (11) are fixedly connected to the square rod (10); a motor (12) is provided at the bottom of the dust collector (1) corresponding to the position of the uppermost tooth (11); a drive gear (13) is fixedly connected to the output end of the motor (12), and the drive gear (13) meshes with the teeth (11); the drive gear (13) is a toothed gear, and the circumference of the drive gear (13) is the same as the length of the square rod (10); Vibrating rulers (17) are fixedly connected at the positions where the auxiliary ash discharge pipe (3) and the main ash discharge pipe (2) are connected; the round rod (9) is fixedly connected with a striking block (18) corresponding to the vibrating ruler (17) at the position above the vibrating ruler (17); the vibrating ruler (17) is located above the center line of the auxiliary ash discharge pipe (3); The main ash discharge pipe (2) is provided with a first fixing block (14) at a position below the auxiliary ash discharge pipe (3); a circumferential array of connecting rods (15) is fixedly connected to the outer surface of the first fixing block (14), and the other end of each connecting rod (15) is fixedly connected to the main ash discharge pipe (2); a rectangular cut (16) is provided on the side of the round rod (9); a rectangular slider (161) is fixedly connected to the first fixing block (14) at a position corresponding to the rectangular cut (16), and the rectangular slider (161) slides within the rectangular cut (16); a second fixing block (19) is fixedly connected to the bottom of the main ash discharge pipe (2) at a position corresponding to the round rod (9), and the round rod (9) slides within the second fixing block (19).

2. The blast furnace dust collector according to claim 1, characterized in that: The distance between the center of the ash discharge port (7) and the bottom of the dust collector (1) is 1.5m-2.5m, and the diameter of the ash discharge port (7) is 150mm-200mm.

3. A blast furnace dust collector according to claim 2, characterized in that: The diameter of the nitrogen blowing pipe (5) is 10-30mm; the angle between the center line of the nitrogen blowing pipe (5) and the center line of the ash discharge port (7) is 30°-60°, and the output end of the nitrogen blowing pipe (5) is tilted downward.

4. A blast furnace dust collector according to claim 3, characterized in that: The nitrogen flow rate of the nitrogen blowing pipe (5) is 10 Nm. 3 / min.

5. A blast furnace dust collector according to claim 4, characterized in that: Each nitrogen blowing pipe (5) has a filter screen (6) fixedly connected to its output end, and the filter screen (6) has a pore size of 1 mm.

6. A blast furnace dust collector according to claim 5, characterized in that: The method of using the dust collector includes the following steps: S1: First, open the ball valve (4) on one side of the auxiliary ash discharge pipe (3) to discharge the dust from the ash discharge port (7), the auxiliary ash discharge pipe (3) and the main ash discharge pipe (2); S2: When no dust is discharged, close the ball valve (4) on the auxiliary ash discharge pipe (3), open the ball valve (4) on the other auxiliary ash discharge pipe (3), continue to discharge ash, and close all ball valves (4) after the ash discharge is completed; S3: Open the nitrogen blow pipe (5) and blow nitrogen back into the dust collector (1) so that the dust is redistributed inside the dust collector (1) along with the airflow; S4: Repeat the operations of S1, S2 and S3 until no more dust is discharged.

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