Smoke dust catching system

Abstract

The invention discloses a smoke dust catching system which comprises a first smoke hood and a second smoke hood which are arranged above a spheroidizing bag and symmetrically arranged, the first smoke hood and the second smoke hood are arranged in a spaced mode, the first smoke hood is connected with a negative pressure generating device, and the second smoke hood is connected with a smoke exhaust pipeline. And the first flue gas cover is also provided with an air curtain system for blowing rising flue gas towards the direction of the second flue gas cover. According to the smoke dust catching system provided by the invention, the outward flowing of smoke can be greatly reduced, and the smoke dust catching efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of molten iron spheroidization smoke treatment, and in particular to a smoke capture system. Background Art

[0002] In the production process of cast iron, especially ductile iron, it is necessary to place a spheroidizing agent in the molten iron ladle to make the molten iron undergo a spheroidizing reaction. Because the spheroidizing agent contains 5-10% magnesium, it reacts at high temperature to produce a large amount of flue gas. In order to avoid flue gas pollution of the external environment, after the spheroidizing ladle is moved into the spheroidizing position, the fume hoods on both sides are moved closer to the middle and moved above the spheroidizing ladle, and then the exhaust is turned on to exhaust the flue gas. However, the amount of flue gas is large and it is easy to escape from between the left and right fume hoods, and the flue gas capture efficiency is low. Since a metallurgical crane is set above the spheroidizing position, the metallurgical crane is located above the fume hood, and the metallurgical crane is used to lift the molten metal. Therefore, after the left and right fume hoods are close to each other, space for the metallurgical crane to move still needs to be reserved, resulting in the inability to merge the two fume hoods into a single fume hood. Summary of the invention

[0003] The purpose of the present invention is to provide a smoke capture system which can significantly reduce smoke leakage and significantly improve smoke capture efficiency.

[0004] To achieve the above-mentioned purpose, the present invention provides a smoke and dust capture system, comprising a first smoke hood and a second smoke hood which are arranged above a spheroidizing bag and are symmetrically arranged, the first smoke hood and the second smoke hood are arranged at an interval, the first smoke hood is connected to a negative pressure generating device, the second smoke hood is connected to a smoke exhaust pipeline, and the first smoke hood is also provided with a wind curtain system for blowing the rising smoke toward the second smoke hood.

[0005] As a further improvement of the present invention, the air curtain system includes a longitudinal duct and a first transverse duct, the longitudinal duct is connected to a plurality of first air nozzles along its length direction, the first transverse duct is connected to a plurality of second air nozzles along its length direction, the longitudinal duct is arranged on the inner side of the longitudinal edge of the first fume hood, and the first transverse duct is arranged on the inner side of the top edge of the first fume hood; the first air nozzle is arranged horizontally and inclined toward the middle of the inner cavity of the second fume hood, and the angle between the first air nozzle and the vertical plane where the inner edge opening of the first fume hood is located is 5°-30°; the second air nozzle is obliquely downward toward the middle of the inner cavity of the second fume hood; the angle between the second air nozzle and the horizontal plane is 5°-30°.

[0006] As a further improvement of the present invention, the air curtain system also includes a second transverse duct, which is arranged on the outer side of the top edge of the first fume hood, and a plurality of third air nozzles are connected to the second transverse duct along its length direction, and the third air nozzles are obliquely downward toward the middle of the inner cavity of the second fume hood; the angle between the third air nozzle and the horizontal plane is greater than the angle between the second air nozzle and the horizontal plane; the angle between the third air nozzle and the horizontal plane is 10°-40°.

[0007] As a further improvement of the present invention, the negative pressure generating device includes an intake pipe, a ventilation pipe and an exhaust fan which are connected in sequence along the air flow direction. The intake pipe is arranged on the inner side of the first fume hood, the ventilation pipe and the exhaust fan are both located on the outer side of the first fume hood, and the intake port of the intake pipe is close to the top of the first fume hood.

[0008] As a further improvement of the present invention, an inner hood body is provided on the inner side of the second fume hood, and a plurality of first air suction holes are provided on the wall of the inner hood body, the first air suction holes face the wind curtain system, and the inner cavity of the inner hood body is connected with the smoke exhaust pipe of the second fume hood; the end face of the inner hood body on which the first air suction holes are provided is arranged obliquely downward, and the angle between the end face and the horizontal plane is 30°-80°.

[0009] As a further improvement of the present invention, a plurality of second air suction holes are provided at the bottom of the inner cover body.

[0010] As a further improvement of the present invention, a gap is formed between the rear sides of the first fume hood and the second fume hood, and a smoke baffle matching with the gap is provided at the rear side of the gap, and the smoke baffle is movably matched with the gap.

[0011] As a further improvement of the present invention, a moving device is connected to the top of the smoke baffle.

[0012] As a further improvement of the present invention, the moving device includes a plurality of rollers and a transversely arranged guide rail, the rollers are rotatably connected to the top of the smoke baffle, and the rollers and the guide rails are in rolling cooperation.

[0013] Beneficial Effects

[0014] Compared with the prior art, the smoke and dust capture system of the present invention has the following advantages:

[0015] 1. When both the first fume hood and the second fume hood are moved to the spheroidizing bag, the negative pressure generating device is started, a negative pressure is formed in the first fume hood, and the exhaust pipe starts to draw air. When the molten iron rushes into the spheroidizing bag to form a large amount of smoke, the smoke moves upward under the action of negative pressure, and the smoke originally close to the second fume hood is directly sucked away, while the smoke close to the first fume hood and the smoke between the two fume hoods move toward the second fume hood driven by the airflow blown by the air curtain system and are sucked away by the second fume hood, thereby improving the efficiency of smoke capture and minimizing smoke leakage.

[0016] 2. In the air curtain system, the first air nozzle of the longitudinal duct and the second air nozzle of the first transverse duct are inclined toward the middle of the inner cavity of the second fume hood. The airflow through the air curtain controls the rising smoke to the inner side of the second fume hood as much as possible, which is more conducive to the smoke being discharged by the first suction hole and the second suction hole of the second fume hood. The smoke capture efficiency can reach more than 95%.

[0017] 3. In the air curtain system, the third air nozzle blows air from the outer side of the top edge of the first smoke hood to the middle of the inner cavity of the second smoke hood. Since the angle between the third air nozzle and the horizontal plane is greater than the angle between the second air nozzle and the horizontal plane, the gas blown out from the third air nozzle can provide greater downward pressure on the smoke, further reducing the outflow of the rising smoke.

[0018] 4. The inner cover of the second smoke hood is provided with a plurality of first and second suction holes of smaller size, which is conducive to forming a greater negative pressure in the inner cover and improving the smoke exhaust efficiency. The end surface of the inner cover with the first suction hole is arranged obliquely downward, which is more conducive to extracting the smoke moving laterally and rising at the same time. The second suction hole is arranged at the bottom of the inner cover, which can directly absorb the smoke located below the second smoke hood and rising.

[0019] 5. The smoke shield can cover the gap between the rear sides of the first smoke hood and the second smoke hood to reduce the smoke overflow on that side.

[0020] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a partial cross-sectional view of the main view of the smoke and dust capture system;

[0023] Figure 2 for Figure 1 AA view;

[0024] Figure 3 for Figure 1 BB direction view;

[0025] Figure 4 is a right side view of the first fume hood;

[0026] Figure 5is a three-dimensional diagram of a first fume hood and a second fume hood;

[0027] Figure 6 This is the rear view of the air curtain system. DETAILED DESCRIPTION

[0028] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0029] Example

[0030] The specific embodiments of the present invention are as follows Figures 1 to 6 As shown, a smoke dust capture system includes a first smoke hood 11 and a second smoke hood 12 which are arranged symmetrically above a spheroidizing bag 9, the first smoke hood 11 and the second smoke hood 12 are arranged at an interval, the first smoke hood 11 is connected to a negative pressure generating device 5, the second smoke hood 12 is connected to a smoke exhaust pipeline 2, and the first smoke hood 11 is also provided with a wind curtain system 3 for blowing the rising smoke toward the second smoke hood 12. The smoke exhaust pipelines 2 of the two smoke hoods are both connected to butterfly valves 21. The pipe diameter of the smoke exhaust pipeline 2 is 800 mm.

[0031] In this embodiment, both the first fume hood 11 and the second fume hood 12 are formed by connecting a top plate 14 , a front end plate 13 , a rear end plate 15 and a side plate 16 .

[0032] The air curtain system 3 includes a longitudinal duct 32 and a first transverse duct 34. The longitudinal duct 32 is connected to a plurality of first air nozzles 31 along its length, and the first transverse duct 34 is connected to a plurality of second air nozzles 33 along its length. The longitudinal duct 32 is arranged on the inner side of the longitudinal edge of the first fume hood 11. In this embodiment, the longitudinal duct 32 is arranged on the inner side of the vertical edge of the front end plate 13 of the first fume hood 11. The first transverse duct 34 is arranged on the inner side of the top edge of the first fume hood 11, specifically, below the edge of the top plate 14 of the first fume hood 11. The first air nozzle 31 is arranged horizontally and tilted toward the middle of the inner cavity of the second fume hood 12. The angle between the first air nozzle 31 and the vertical plane where the inner edge opening of the first fume hood 11 is located is 5°-30°. The second air nozzle 33 is obliquely downward toward the middle of the inner cavity of the second fume hood 12. The angle between the second air nozzle 33 and the horizontal plane is 5°-30°, which is specifically selected based on the minimum distance between the first fume hood 11 and the second fume hood 12 and the distribution position of the first air intake holes 18 on the second fume hood 12. The smaller the distance between the first fume hood 11 and the second fume hood 12, the larger the angle between the second air nozzle 33 and the horizontal plane. Similarly, the angle between the first air nozzle 31 and the vertical plane where the inner edge opening of the first fume hood 11 is located is also specifically selected based on the minimum distance between the first fume hood 11 and the second fume hood 12 and the distribution position of the first air intake holes 18 on the second fume hood 12.

[0033] The air curtain system 3 also includes a second transverse duct 36, which is arranged outside the top edge of the first fume hood 11, specifically, above the edge of the top plate 14 of the first fume hood 11. The second transverse duct 36 is parallel to the first transverse duct 34. A plurality of third air nozzles 35 are connected to the second transverse duct 36 along its length direction, and the third air nozzles 35 are obliquely downward toward the middle of the inner cavity of the second fume hood 12. The angle between the third air nozzle 35 and the horizontal plane is greater than the angle between the second air nozzle 33 and the horizontal plane; the angle between the third air nozzle 35 and the horizontal plane is 10°-40°, which is specifically selected according to the minimum distance between the first fume hood 11 and the second fume hood 12 and the distribution position of the first air intake holes 18 on the second fume hood 12. The smaller the distance between the first fume hood 11 and the second fume hood 12, the larger the angle between the third air nozzle 35 and the horizontal plane.

[0034] The specific directions of the first air nozzle 31, the second air nozzle 33 and the third air nozzle 35 can be set as long as the smoke generated in the spheroidization process is prevented from leaking out as much as possible.

[0035] The longitudinal duct 32 , the first transverse duct 34 and the second transverse duct 36 of the air curtain system 3 are all connected to the output end of the blower 4 . The air inlet of the blower 4 is used to inhale relatively clean air from the outside, and the blower 4 supplies air to each air nozzle.

[0036] The negative pressure generating device 5 includes an air intake pipe 51, a ventilation pipe 52 and an exhaust fan 53 which are sequentially connected along the air flow direction. The air intake pipe 51 is arranged inside the first fume hood 11, and the ventilation pipe 52 and the exhaust fan 53 are both located outside the first fume hood 11. The air intake port of the air intake pipe 51 is close to the top of the first fume hood 11. In this embodiment, two air intake pipes 51 are arranged inside the first fume hood 11, and the air intake ports of the two air intake pipes 51 are arranged horizontally. After the exhaust fan 53 is started, air is drawn through the air intake pipe 51, thereby forming a negative pressure inside the inside of the first fume hood 11. The smoke is basically not discharged from the air intake pipe 51, so the air intake pipe 51 is arranged at a higher position, and its main function is to quickly rise the smoke generated in the spheroidization process by generating negative pressure, and to minimize the smoke from rushing outward to the periphery of the spheroidization bag when the smoke is just formed, so as to improve the smoke capture rate.

[0037] An inner cover body 17 is provided on the inner side of the second smoke hood 12, and a plurality of first air intake holes 18 are provided on the wall of the inner cover body 17. The first air intake holes 18 face the air curtain system 3, and the inner cavity of the inner cover body 17 is connected with the smoke exhaust pipe 2 of the second smoke hood 12. The end face of the inner cover body 17 on which the first air intake holes 18 are provided is arranged obliquely downward, and the angle between it and the horizontal plane is 30°-80°. In this embodiment, the first air intake holes 18 are strip holes or elliptical holes, and the size of the first air intake holes 18 is much smaller than the diameter of the smoke exhaust pipe 2; the angle between the end face of the inner cover body 17 on which the first air intake holes 18 are provided and the horizontal plane is 45°. In addition, the length of the area on which the first air intake holes 18 are distributed on the inner cover body 17 is adapted to the width of the second smoke hood 12, so that the inner cover body 17 can cover a larger smoke exhaust area.

[0038] The bottom of the inner cover body 17 is provided with a plurality of second air suction holes 19, each of which is arranged downwards to directly suck away the rising smoke below the second smoke cover 12. The shape of the second air suction holes 19 can be the same as that of the first air suction holes 18.

[0039] Since a metallurgical crane is arranged above the spheroidizing station, the metallurgical crane is located above the fume hood, and the metallurgical crane is used to lift the molten metal. Therefore, after the first fume hood 11 and the second fume hood 12 are close to each other, space for the metallurgical crane to move still needs to be reserved. In this embodiment, the minimum spacing between the first fume hood 11 and the second fume hood 12 is about 500 mm, the diameters of the longitudinal pipe 32, the first transverse pipe 34, and the second transverse pipe 36 are 80 mm, the end face of the first air intake hole 18 provided on the inner cover body 17 is 400 mm high, and the exhaust volume of the exhaust pipe 2 is about 60,000 cubic meters per hour. Therefore, the angle between the first air nozzle 31 and the vertical plane where the inner edge opening of the first fume hood 11 is located is set to 10°, the angle between the second air nozzle 33 and the horizontal plane is set to 10°, and the angle between the third air nozzle 35 and the horizontal plane is set to 20°.

[0040] When the first fume hood 11 and the second fume hood 12 are close to each other and located above the spheroidizing bag 9, a gap 6 is formed between the rear sides of the first fume hood 11 and the second fume hood 12, and a smoke baffle 7 matching the gap 6 is provided at the rear side of the gap 6, and the smoke baffle 7 is movably matched with the gap 6. The smoke baffle 7 is basically in contact with the rear end plate 15 of the fume hood.

[0041] A moving device 8 is connected to the top of the smoke shield 7. In this embodiment, the moving device 8 includes a plurality of rollers 8 and a horizontally arranged guide rail 81. The rollers 8 are rotatably connected to the top of the smoke shield 7. The rollers 8 and the guide rail 81 are in rolling cooperation. The guide rail 81 is horizontally arranged and fixed relative to the ground. The smoke shield 7 can be manually pulled to translate, or the rollers 8 can be linked to a drive motor. After the drive motor is started, the rollers 8 are driven to rotate, so that the smoke shield 7 moves along the guide rail 81.

[0042] When the spheroidizing bag 9 moves to the spheroidizing position, both the first fume hood 11 and the second fume hood 12 move to the top of the spheroidizing bag 9, and the smoke baffle 7 seals the gap 6 between the rear sides of the two; the negative pressure generating device is started, a negative pressure is formed in the first fume hood 11, and the exhaust pipe 2 is connected, the butterfly valve 21 of the exhaust pipe 2 is opened, and the exhaust pipe 2 starts to exhaust. When the molten iron rushes into the spheroidizing bag 9 to form a large amount of smoke, the smoke moves upward rapidly under the action of the negative pressure inside the first fume hood, and the smoke originally close to the second fume hood 12 is directly sucked away by the first suction hole 18 and the second suction hole 19, while the smoke close to the first fume hood 11 and the smoke between the two fume hoods, driven by the airflow blown out of each nozzle of the air curtain system 3, moves toward the second fume hood 12 and is sucked away through the first suction hole 18 of the second fume hood 12, thereby improving the efficiency of smoke capture and minimizing smoke leakage. After the work is completed, the butterfly valve 21 is closed, the air curtain system 3 is closed, the exhaust fan of the negative pressure generating device is closed, and the first fume hood 11, the second fume hood 12, and the smoke baffle 7 are moved away from the spheroidizing position.

[0043] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A smoke and dust capture system, characterized in that: The invention comprises a first fume hood (11) and a second fume hood (12) which are arranged symmetrically above a spheroidizing bag (9); the first fume hood (11) and the second fume hood (12) are arranged at an interval; the first fume hood (11) is connected to a negative pressure generating device (5); the second fume hood (12) is connected to a fume exhaust pipeline (2); and the first fume hood (11) is also provided with an air curtain system (3) for blowing rising fume toward the second fume hood (12).

2. A smoke and dust capture system according to claim 1, characterized in that: The air curtain system (3) comprises a longitudinal duct (32) and a first transverse duct (34); a plurality of first air nozzles (31) are connected to the longitudinal duct (32) along its length direction; a plurality of second air nozzles (33) are connected to the first transverse duct (34) along its length direction; the longitudinal duct (32) is arranged on the inner side of the longitudinal edge of the first fume hood (11); and the first transverse duct (34) is arranged on the inner side of the top edge of the first fume hood (11); the first air nozzles (31) are arranged horizontally and tilted toward the middle of the inner cavity of the second fume hood (12); the angle between the first air nozzle (31) and the vertical plane where the inner edge opening of the first fume hood (11) is located is 5°-30°; the second air nozzles (33) are tilted downward toward the middle of the inner cavity of the second fume hood (12); and the angle between the second air nozzles (33) and the horizontal plane is 5°-30°.

3. A smoke and dust capture system according to claim 2, characterized in that: The air curtain system (3) further comprises a second transverse duct (36), the second transverse duct (36) being arranged outside the top edge of the first fume hood (11), a plurality of third air nozzles (35) being connected to the second transverse duct (36) along its length direction, the third air nozzles (35) being obliquely downwardly directed toward the middle of the inner cavity of the second fume hood (12); the angle between the third air nozzles (35) and the horizontal plane is greater than the angle between the second air nozzles (33) and the horizontal plane; the angle between the third air nozzles (35) and the horizontal plane is 10°-40°.

4. A smoke and dust capture system according to claim 1, characterized in that: The negative pressure generating device (5) comprises an air intake pipe (51), a ventilation pipe (52) and an exhaust fan (53) which are sequentially connected along the air flow direction; the air intake pipe (51) is arranged on the inner side of the first fume hood (11); the ventilation pipe (52) and the exhaust fan (53) are both located on the outer side of the first fume hood (11); and the air intake port of the air intake pipe (51) is close to the top of the first fume hood (11).

5. The smoke and dust capture system according to claim 1, characterized in that: An inner cover body (17) is provided on the inner side of the second smoke hood (12); a plurality of first air inlet holes (18) are provided on the wall of the inner cover body (17); the first air inlet holes (18) face the air curtain system (3); the inner cavity of the inner cover body (17) is connected to the smoke exhaust pipeline (2) of the second smoke hood (12); the end surface of the inner cover body (17) on which the first air inlet holes (18) are provided is arranged obliquely downward, and the angle between the end surface and the horizontal plane is 30°-80°.

6. A smoke and dust capture system according to claim 1, characterized in that: The bottom of the inner cover (17) is provided with a plurality of second air suction holes (19).

7. The smoke and dust capture system according to claim 1, characterized in that: A gap (6) is formed between the rear sides of the first smoke hood (11) and the second smoke hood (12), and a smoke baffle (7) matching the gap (6) is provided on the rear side of the gap, and the smoke baffle (7) is movably matched with the gap (6).

8. A smoke and dust capture system according to claim 7, characterized in that: The top of the smoke baffle (7) is connected with a moving device (8).

9. A smoke and dust capture system according to claim 7, characterized in that: The moving device (8) comprises a plurality of rollers (8) and a transversely arranged guide rail (81); the rollers (8) are rotatably connected to the top of the smoke baffle (7); and the rollers (8) and the guide rail (81) are in rolling cooperation.

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