A dust removal device for a blast furnace iron tapping area and a filter plate replacement method thereof

Abstract

This invention belongs to the field of ironmaking dust removal technology, specifically a dust removal device for the blast furnace ironmaking tapping area. It includes a frame and an inlet pipe, an outlet pipe, a filter box mechanism, a screen changing mechanism, and a fan mounted on the frame. The filter box mechanism includes a first box, a second box, and an opening / closing drive device. The screen changing mechanism includes a translation support, a translation drive device, a rotating support, a rotating drive device, and filter plates. The rotation of the rotating support allows one of the two filter plates to be selectively positioned between the first and second boxes, with the first and second boxes clamping the filter plate between them to form a sealed structure. This invention also provides a method for replacing the filter plates in the aforementioned blast furnace ironmaking tapping area dust removal device. This invention can automatically replace the in-use filter plates with spare ones, greatly reducing the downtime of the dust removal device and offering advantages such as good dust removal effect, low cost, and small space occupation.

Description

Technical Field

[0001] This invention belongs to the field of ironmaking dust removal technology, specifically relating to a dust removal device for the tapping area of ​​a blast furnace and a method for replacing its filter plates. Background Technology

[0002] Blast furnace ironmaking is a method of continuously producing liquid pig iron using coke, iron ore, and flux in a blast furnace. It is one of the most common steel production methods at present. However, during the ironmaking process, a large amount of particulate dust is emitted from the blast furnace during the tapping of iron or slag. Therefore, some dust removal equipment is used to treat particulate dust and reduce environmental harm. The most common method is to use blower equipment to extract dust and filter it during the extraction process to remove particulate impurities.

[0003] However, during the use of the above-mentioned dust removal methods, it was found that due to the high dust content, a large amount of particulate dust would adhere to the filter screen after a period of use. Over time, this would affect the filtration performance of the filter screen. Therefore, the dust removal equipment needed to be shut down every once in a while to remove the filter screen for cleaning or replacement. This operation would cause the entire dust removal equipment to stop. Furthermore, because the temperature of the dust particles in the iron tapping area was high, the temperature of the filter screen was also high. It needed to cool down for a period of time before cleaning, which would delay subsequent dust removal work. The dust removal process was lengthy and not conducive to the continuous operation of blast furnace ironmaking.

[0004] The "one-in-use, one-out-of-service" approach is a common solution to the aforementioned problems. This involves setting up two parallel dust collection units, controlled by valves to allow them to operate alternately. For example, the miniature dual-fan bag filter disclosed in CN202893093U consists of two relatively independent dust collection systems. When one system reaches the required cleaning speed, the centrifugal fan stops, and that system enters the cleaning state. After one cleaning cycle is completed, it re-enters the filtration state. The two systems can switch between each other, one in use and one on standby, or they can be used simultaneously, enabling offline cleaning and maintenance between systems. The drawback of this approach is that it requires two independent dust collection units, leading to high costs and significant space requirements. Summary of the Invention

[0005] To address the shortcomings of the prior art, this invention provides a dust removal device for the tapping area of ​​a blast furnace. By automatically replacing the in-use filter plates with spare ones, the downtime of the dust removal device is shortened, enabling the dust removal operation to be carried out quickly and continuously, thus ensuring the dust removal effect.

[0006] This invention provides a dust removal device for the tapping area of ​​a blast furnace ironmaking plant, comprising a frame and an inlet pipe, an outlet pipe, a filter box mechanism, a screen changing mechanism, and a fan mounted on the frame. The filter box mechanism includes a first box, a second box, and an opening / closing drive device. The inlet end of the first box is connected to the inlet pipe via a first corrugated pipe, and the outlet end of the second box is connected to the outlet pipe via a second corrugated pipe. The outlet end of the first box and the inlet end of the second box are positioned opposite each other. The opening / closing drive device drives the first and second boxes to move in opposite directions. The screen changing mechanism includes a translation support, a translation drive device, a rotating support, and a rotating drive device. The device includes a moving device and filter plates; the translational support is linearly movable and mounted on the frame, and the translational drive device is used to drive the translational support to move linearly; the rotating support is rotatably mounted on the translational support, and the rotational drive device is used to drive the rotating support to rotate; two filter plates are provided and spaced apart, and detachably mounted on the rotating support; the rotation of the rotating support allows one of the two filter plates to be selectively located between the first housing and the second housing, and the first housing and the second housing can clamp the filter plate between the first housing and the second housing to form a sealed structure; the fan is used to make the gas flow from the air inlet pipe to the air outlet pipe.

[0007] Furthermore, the air inlet pipe is provided with multiple air inlet hoods at intervals.

[0008] Furthermore, a dust collection box is connected to one side of the bottom of the first box. The bottom of the first box is provided with an inclined surface for moving dust to the dust collection box. The bottom of the dust collection box is provided with a dust discharge port. The dust collection box is provided with a cover plate for opening and closing the dust discharge port.

[0009] Furthermore, the fan is located between the air inlet pipe and the first corrugated pipe.

[0010] Furthermore, the opening and closing drive device includes two cylinders mounted on the frame, and the piston rods of the two cylinders are respectively connected to the first housing and the second housing.

[0011] Furthermore, the translation drive device includes a first motor mounted on the frame and a lead screw transmission mechanism. The lead screw transmission mechanism includes a lead screw and a slider. The lead screw and the slider are threaded together. The slider is connected to the translation bracket. The output shaft of the first motor is connected to the lead screw.

[0012] Furthermore, the rotary drive device includes a second motor mounted on a translation bracket, the output shaft of which is connected to the rotary bracket.

[0013] When a filter plate becomes clogged and needs cleaning, it needs to be replaced with a spare filter plate. Therefore, this invention also provides a method for replacing the filter plates of the aforementioned dust removal device in the blast furnace ironmaking tapping area, comprising the following steps:

[0014] S1. Turn off the fan;

[0015] S2. Control the opening and closing drive device to drive the first box and the second box to move in opposite directions, thereby releasing the filter plate to be cleaned;

[0016] S3. Control the translation drive device to drive the filter plate to be cleaned away from the first box and the second box.

[0017] S4. Control the rotary drive device to drive the filter plate to be cleaned and the spare filter plate to interchange positions, and control the translation drive device to drive the spare filter plate to be inserted between the first box and the second box.

[0018] S5. Control the opening and closing drive device to drive the first box and the second box to move towards each other, thereby clamping the spare filter plate and forming a sealed structure.

[0019] S6. Restart the fan, remove the filter plate to be cleaned from the rotating bracket and clean it. After cleaning, install it back in its original position for later use.

[0020] By means of the above technical solution, the technical solution provided by the present invention has at least the following advantages: (1) It can automatically replace the filter plate in use with the spare filter plate, which greatly shortens the downtime of the dust removal device, so that the dust removal operation can be carried out quickly and continuously, and the dust removal effect is guaranteed. (2) It does not require the setting of two independent dust removal devices, which has lower cost and smaller space occupation. (3) The first box and the second box can clamp the filter plate between the first box and the second box and form a sealed structure, which effectively prevents the smoke and dust from escaping and guarantees the dust removal effect. (4) The filter plate is detachably set on the rotating bracket. The filter plate to be cleaned is released by the first box and the second box and gets out of the sealed structure, which can cool down quickly. While the spare filter plate is working, the replaced filter plate can be cleaned quickly and conveniently. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the dust removal device at the blast furnace tapping area in Example 1. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the dust removal device at the blast furnace tapping area in Example 1. Figure 2 .

[0023] Figure 3 This is a schematic diagram of the assembly structure of the frame, air inlet pipe and fan in Example 1.

[0024] Figure 4 This is a schematic diagram of the assembly structure of the filter box mechanism and the screen changing mechanism in Example 1.

[0025] Figure 5This is a schematic diagram of the assembly structure of the first box, the ash receiving box, and the first corrugated pipe in Example 1.

[0026] Figure 6 This is a schematic diagram of the assembly structure of the second box and the second bellows in Example 1.

[0027] Figure 7 This is a schematic diagram of the screen changing mechanism in Example 1 (the translation drive device is not shown).

[0028] Figure 8 This is a schematic diagram of the lead screw transmission mechanism in Example 1.

[0029] The components are: 1-base, 2-support plate, 3-beam plate, 4-fan, 5-air inlet pipe, 6-air inlet hood, 7-first housing, 8-second housing, 9-first corrugated pipe, 10-air guide pipe, 11-second corrugated pipe, 12-exhaust pipe, 13-ash collection box, 14-cylinder, 15-connecting plate, 16-rotating bracket, 17-mounting seat, 18-slot, 19-filter plate, 20-screw bracket, 21-screw, 22-slider, 23-translation bracket, 24-rotating shaft, 25-first motor, 26-second motor, 27-sloping surface, 28-cover plate, 29-column, 30-guide column. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0031] Example 1

[0032] Figures 1-8 Embodiment 1 of the present invention is shown.

[0033] like Figure 1 , Figure 2 As shown, a dust removal device for the tapping area of ​​a blast furnace includes a frame and an air inlet pipe 5, an air outlet pipe 12, a filter box mechanism, a screen changing mechanism, and a fan 4 installed on the frame.

[0034] The frame includes a base 1, a support plate 5, a beam plate 3, and a column 29. The support plate 5 is vertically connected to the right side of the base. The beam plate 3 is located above the base 1 and is fixedly connected to the base through the beam plate 3 and the column 29. The column 29 has two columns located on the left side of the beam plate 3, and the support plate 5 is located on the right side of the beam plate 3.

[0035] The air inlet pipe 5 is provided with four air inlet covers 6 at intervals, and the air inlet covers 6 are in the shape of a frustum.

[0036] The fan 4 is a centrifugal fan. The air inlet of the fan 4 is connected to the air inlet pipe 5, and the air outlet of the fan 4 is connected to the air guide pipe 10.

[0037] The filter box mechanism includes a first box 7, a second box 8, and an opening / closing drive device. (See also...) Figure 5 , Figure 6 The air inlet of the first housing 7 is connected to the air duct 10 via the first corrugated pipe 9, and the air outlet of the second housing 8 is connected to the exhaust pipe 12 via the second corrugated pipe 11. The air outlet of the first housing 7 and the air inlet of the second housing 8 are positioned opposite each other. The opening and closing drive device is used to drive the first housing 7 and the second housing 8 to move towards or in opposite directions. Specifically, as shown in... Figures 2-4 As shown, a guide post 30 is fixedly provided at the bottom of the beam plate 3 along the left and right direction. A connecting plate 15 is provided on both the first box body 7 and the second box body 8. The connecting plate 15 is slidably engaged with the guide post 30. The opening and closing drive device includes two cylinders 14 installed on the beam plate 3. The piston rods of the two cylinders 14 are respectively connected to the two connecting plates 15.

[0038] The screen changing mechanism includes a translation support 23, a translation drive device, a rotation support 16, a rotation drive device, and a filter plate 19.

[0039] The translation bracket 23 is vertically slidably mounted on the support plate 5. The translation drive device is used to drive the translation bracket 23 to move vertically. For details, see [link to details]. Figure 4 , Figure 8 The translation drive device includes a first motor 25 and a lead screw transmission mechanism. The lead screw transmission mechanism includes a lead screw bracket 20, a lead screw 21, and a slider 22. The lead screw bracket 20 is fixedly installed on the right side of the support plate 5. The lead screw 21 is vertically installed on the lead screw bracket 20. The slider 22 is vertically slidably installed on the support plate 5 and fixedly connected to the translation bracket 23. The lead screw 21 and the slider 22 are threadedly engaged. The first motor 25 is installed on the lead screw bracket 20 and its output shaft is connected to the lead screw 21.

[0040] See Figure 4 , Figure 7The rotating bracket 16 is rotatably mounted on the translation bracket 23, and the rotating drive device is used to drive the rotating bracket 16 to rotate. In this embodiment, the rotating drive device includes a second motor 26 mounted on the translation bracket 23, and the output shaft of the second motor 26 is connected to the rotating bracket 16. Two filter plates 19 are provided and spaced apart, detachably mounted on the rotating bracket 16. Specifically, two mounting seats 17 are spaced apart on the rotating bracket, and each mounting seat 17 has a slot 18 for inserting the filter plate 19. The filter plate 19 is inserted into the slot 18 and fixed with bolts. The filter plate 19 is provided with filter media, which is one or more of polyphenylene sulfide fiber, polyimide fiber, polytetrafluoroethylene fiber, aramid fiber, aramid sulfone fiber, and glass fiber.

[0041] The rotation of the rotating bracket 16 allows one of the two filter plates 19 to be positioned between the first housing 7 and the second housing 8. The first housing 7 and the second housing 8 can clamp the filter plate 19 between the first housing 7 and the second housing 8 to form a sealed structure. To ensure the sealing of the structure and prevent flue gas from escaping, sealing gaskets are provided on both sides of the filter plate 19.

[0042] like Figure 5 As shown, a dust collection box 13 is connected to one side of the bottom of the first box 7. The bottom of the first box 7 is provided with an inclined surface 27 for moving dust into the dust collection box 13. The bottom of the dust collection box 13 is funnel-shaped and has a dust discharge port. The dust collection box 13 is provided with a cover plate 28 for opening and closing the dust discharge port. The cover plate 28 is hinged to the dust collection box 13 and fixed with bolts. When it is necessary to discharge the dust particles in the dust collection box 13, simply place a collection box below the dust discharge port, then unscrew the bolts locking the cover plate 28 to open the cover plate 28, and the dust particles in the dust collection box 13 will fall into the collection box.

[0043] When the dust removal device at the blast furnace ironmaking tapping area in this embodiment is working, the fan 4 is started, and the air inlet pipe 5 draws in the dust from the site through the air inlet hood 6. The dust passes through the fan 4, the air guide pipe 10, and the first corrugated pipe 9 in sequence and enters the first box 7. The dust is filtered by the filter plate 18 and falls into the ash collection box 13 through the inclined surface 27.

[0044] When a filter plate becomes clogged and needs cleaning, it needs to be replaced with a spare filter plate. Therefore, this embodiment also provides a method for replacing the filter plates of the aforementioned dust removal device in the blast furnace ironmaking tapping area, comprising the following steps:

[0045] S1. Turn off fan 4;

[0046] S2. Control the opening and closing drive device to drive the first box 7 and the second box 8 to move in opposite directions, thereby releasing the filter plate 19 to be cleaned. During this process, the first bellows 9 and the second bellows 11 can prevent interference with the movement of the first box 7 and the second box 8.

[0047] S3. Control the translation drive device to drive the filter plate 19 to be cleaned away from the first box 7 and the second box 8 to prevent the first box 7 and the second box 8 from interfering with the rotation of the filter plate 19 to be cleaned.

[0048] S4. Control the rotary drive device to drive the filter plate 19 to be cleaned and the spare filter plate 19 to interchange positions, and control the translation drive device to drive the spare filter plate 19 to be inserted between the first box 7 and the second box 8.

[0049] S5. Control the opening and closing drive device to drive the first box 7 and the second box 8 to move towards each other, thereby clamping the spare filter plate (19) and forming a sealed structure.

[0050] S6. Restart the fan 4, remove the filter plate 19 to be cleaned from the rotating bracket 16 and clean it. After cleaning, install it back in its original position for later use.

[0051] The technical solution provided in this embodiment has at least the following advantages: (1) It can automatically replace the filter plate in use with the spare filter plate, which greatly shortens the downtime of the dust removal device, so that the dust removal operation can be carried out quickly and continuously, and the dust removal effect is guaranteed. (2) It does not require the setting of two independent dust removal devices, which has lower cost and smaller space occupation. (3) The first box 7 and the second box 8 can clamp the filter plate 19 between the first box 7 and the second box 8 and form a sealed structure, which effectively prevents the smoke and dust from escaping and ensures the dust removal effect. (4) The filter plate 19 is detachably set on the rotating bracket 16. The filter plate to be cleaned is released by the first box 7 and the second box 8 and gets out of the sealed structure, which can cool down quickly. While the spare filter plate is working, the replaced filter plate can be cleaned quickly and conveniently.

[0052] The above description is merely a specific embodiment of this disclosure, but the protection scope of this disclosure is not limited thereto. Any changes, substitutions or combinations that can be easily conceived by those skilled in the art within the technical scope disclosed in this disclosure or under the ideas disclosed in this disclosure should be covered within the protection scope of this disclosure.

Claims

1. A dust removal device for the tapping area of ​​a blast furnace ironmaking plant, characterized in that: Includes a frame and an air inlet pipe (5), an air outlet pipe (12), a filter box mechanism, a screen changing mechanism, and a fan (4) mounted on the frame. The filter box mechanism includes a first box (7), a second box (8), and an opening and closing drive device. The air inlet end of the first box (7) is connected to the air inlet pipe (5) through a first corrugated pipe (9), and the air outlet end of the second box (8) is connected to the exhaust pipe (12) through a second corrugated pipe (11). The air outlet end of the first box (7) and the air inlet end of the second box (8) are arranged opposite to each other. The opening and closing drive device is used to drive the first box (7) and the second box (8) to move towards or in opposite directions. The screen changing mechanism includes a translation bracket (23), a translation drive device, a rotating bracket (16), a rotating drive device, and a filter plate (19). The translation bracket (23) is linearly movable and mounted on the frame. The translation drive device is used to drive the translation bracket (23) to move linearly. The rotating bracket (16) is rotatably mounted on the translation bracket (23). The rotating drive device is used to drive the rotating bracket (16) to rotate. Two filter plates (19) are provided and spaced apart and detachably mounted on the rotating bracket (16). The translation drive device can drive the filter plate (19) to be cleaned to leave the first box (7) and the second box (8). The rotation of the rotating bracket (16) allows the two filter plates (19) to be selectively located between the first box (7) and the second box (8). The first box (7) and the second box (8) can clamp the filter plate (19) between the first box (7) and the second box (8) and form a sealed structure. The fan (4) is used to make the gas flow from the air inlet pipe (5) to the air outlet pipe (12).

2. The dust removal device for the blast furnace ironmaking tapping area as described in claim 1, characterized in that, Multiple air inlet hoods (6) are provided at intervals on the air inlet pipe (5).

3. The dust removal device for the blast furnace ironmaking tapping area as described in claim 1, characterized in that, The bottom side of the first box (7) is connected to a dust collection box (13). The bottom of the first box (7) is provided with an inclined surface (27) for moving dust to the dust collection box (13). The bottom of the dust collection box (13) is provided with a dust discharge port. The dust collection box (13) is provided with a cover plate (28) for opening and closing the dust discharge port.

4. The dust removal device for the blast furnace ironmaking tapping area as described in claim 1, characterized in that, The fan (4) is located between the air inlet pipe (5) and the first corrugated pipe (9).

5. The dust removal device for the blast furnace ironmaking tapping area as described in claim 1, characterized in that, The opening and closing drive device includes two cylinders (14) mounted on the frame, and the piston rods of the two cylinders (14) are respectively connected to the first housing (7) and the second housing (8).

6. The dust removal device for the blast furnace ironmaking tapping area as described in claim 1, characterized in that, The translation drive device includes a first motor (25) mounted on the frame and a lead screw transmission mechanism. The lead screw transmission mechanism includes a lead screw (21) and a slider (22). The lead screw (21) and the slider (22) are threaded together. The slider (22) is connected to the translation bracket (23). The output shaft of the first motor (25) is connected to the lead screw (21).

7. The dust removal device for the blast furnace ironmaking tapping area as described in claim 1, characterized in that, The rotary drive device includes a second motor (26) mounted on a translation bracket, and the output shaft of the second motor (26) is connected to the rotary bracket (16).

8. A method for replacing the filter plate of the dust removal device in the blast furnace ironmaking tapping area as described in any one of claims 1 to 7, comprising the following steps: S1. Turn off the fan (4); S2. Control the opening and closing drive device to drive the first box (7) and the second box (8) to move in opposite directions, thereby releasing the filter plate (19) to be cleaned. S3. Control the translation drive device to drive the filter plate (19) to be cleaned away from the first box (7) and the second box (8); S4. Control the rotary drive device to drive the filter plate (19) to be cleaned and the spare filter plate (19) to interchange positions, and control the translation drive device to drive the spare filter plate (19) to be inserted between the first box (7) and the second box (8). S5. Control the opening and closing drive device to drive the first box (7) and the second box (8) to move towards each other, thereby clamping the spare filter plate (19) and forming a sealed structure; S6. Restart the fan (4); Finally, remove the filter plate (19) to be cleaned from the rotating bracket (16) and clean it. After cleaning, install it back in its original position for later use.

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