A scrap steel preheating sealing device and electric arc furnace

Abstract

The present invention relates to a scrap steel preheating sealing device and an electric arc furnace, and belongs to the field of metallurgical technology. Among them, a scrap steel preheating sealing device includes a material trough, a sealing cover and a fume hood which are arranged above the material trough in sequence, and a sealing door group which is installed on the sealing cover and can swing around the center of rotation, and the sealing door group has at least one set; the sealing door group includes a sealing door plate which is arranged at the lower end of the center of rotation and covers the end surface area formed by the sealing cover and the material trough, and a balancing unit which is arranged at the upper end of the center of rotation and offsets the gravity moment of the sealing door plate in the swinging state; the fume hood is provided with a fume outlet. The sealing device is easy to control, has good sealing effect, long service life, improves production efficiency, and reduces maintenance costs.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy and relates to a scrap steel preheating sealing device and an electric arc furnace. Background Art

[0002] In the field of electric arc furnace steelmaking, the scrap steel preheating continuous charging technology realizes the continuous charging and preheating of scrap steel, thereby ensuring continuous melting and smelting, improving production efficiency, saving energy and reducing consumption, and has been widely promoted and applied at home and abroad. In the actual application of scrap steel preheating electric arc furnace, in order to prevent gas exchange between the feed port and the outside world, the feed port needs to be dynamically sealed.

[0003] The dynamic sealing devices currently in use are difficult to control and have poor sealing effects, resulting in poor dust removal effects, clogging of the flue, and difficulties in the recovery of flue gas waste heat and dioxin control. The sealing doors used in existing dynamic sealing devices often use soft curtains, elastic tubes or thin side laminates, but the strength and rigidity of thin side laminates are low, and they are very easy to bend, deform or even break. Moreover, due to the various forms of scrap steel added to the electric arc furnace, during the scrap steel transportation process, it is often entangled in the soft curtains, elastic tubes or side laminates, damaging or even pulling off the sealing door, hindering the feeding process, and causing scrap steel to block the material. Not only does it fail to play the proper sealing role, but it becomes a fault point that requires frequent maintenance. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a scrap steel preheating sealing device and an electric arc furnace, which are easy to control the sealing, have good sealing effect and long service life, ensure smooth feeding and improve production efficiency.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A scrap steel preheating sealing device comprises a material trough, a sealing cover and a fume hood which are arranged above the material trough in sequence, and a sealing door group which is installed on the sealing cover and can swing around a rotation center point, wherein there is at least one sealing door group; the sealing door group comprises a sealing door plate which is arranged at the lower end of the rotation center point and covers the end surface area formed by the sealing cover and the material trough, and a balancing unit which is arranged at the upper end of the rotation center point and offsets the gravity moment of the sealing door plate in the swinging state; a fume outlet is arranged on the fume hood.

[0007] Furthermore, the balancing unit is a counterweight, so that the center of gravity of the sealed door group in a free state is located at 0 to h / 2 below the rotation center, where h is the height of the sealed door panel.

[0008] Furthermore, the counterweight is composed of a plurality of blocks which are distributed and overlapped.

[0009] Furthermore, the balancing unit is an elastic element, and when the elastic element is in a free state, the sealing door panel is closed.

[0010] Furthermore, the elastic element is a spring with one end connected to the upper end of the rotation center point and the other end connected to the sealing cover.

[0011] Furthermore, the sealing door panel is composed of at least two sub-door panels that are arranged in parallel and can swing independently, and the sub-door panels jointly block the end surface area formed by the sealing cover and the material trough; a sub-balancing unit is correspondingly arranged above the sub-door panel, and the sub-balancing units jointly constitute the balancing unit of the sealing door group.

[0012] Furthermore, the upper end of the sealing door panel is connected to the transmission shaft, and the transmission shaft is hinged to the sealing cover through bearing seats respectively installed at both ends. A connecting shaft vertically connected to the transmission shaft is also provided above one end of the transmission shaft, and the balancing unit is arranged on the connecting shaft.

[0013] Furthermore, it also includes a sealing fan arranged on the sealing cover, and at least one set of sealing door group is arranged on the side of the sealing fan close to the feeding port.

[0014] Furthermore, two sets of the sealing door groups are arranged along the scrap steel conveying direction.

[0015] An electric arc furnace comprises an electric arc furnace body, a scrap steel preheating device and a scrap steel preheating sealing device which are arranged in sequence, wherein the scrap steel preheating sealing device is any one of the above-mentioned scrap steel preheating sealing devices.

[0016] The beneficial effects of the present invention are:

[0017] (1) The sealing door panel swings along with the surface of the scrap steel layer, always close to the surface of the scrap steel layer, easy to control, good sealing effect, economical and reliable, conducive to dust removal, flue gas waste heat recovery and waste gas treatment, and avoids clogging of the flue.

[0018] (2) The sealing door panel is an integral structure with a smooth surface. It will not be entangled or entangled with scrap steel, and has high strength and rigidity and is not easy to deform. It ensures the continuity of scrap steel transportation and thus the production efficiency of the enterprise. During the feeding process, scrap steel will not cause damage such as tearing to the sealing device, thereby increasing its service life and reducing maintenance costs.

[0019] (3) The balancing unit offsets most of the gravity moment when the sealing door panel swings, so that the sealing door panel can be easily pushed open by the scrap steel and will not hinder the normal transportation of the scrap steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention provides the following drawings for illustration:

[0021] Figure 1 A schematic diagram of the structure of a scrap steel preheating sealing device and an electric arc furnace provided in Example 1;

[0022] Figure 2 It is a structural schematic diagram of the sealing door assembly of the first embodiment;

[0023] Figure 3 for Figure 2 A right side view of the sealing door assembly is shown;

[0024] Figure 4 It is a structural schematic diagram of the sealing door assembly of the second embodiment;

[0025] Figure 5 It is a structural schematic diagram of the sealing door assembly of the third embodiment;

[0026] Figure 6 It is a structural schematic diagram of the sealing door assembly of the fourth embodiment;

[0027] Figure numerals: electric arc furnace body 1, scrap steel preheating device 2, scrap steel preheating sealing device 3, material trough 31, sealing cover 32, smoke hood 33, smoke outlet 331, sealing door group 34, sealing door plate 341, counterweight 342, connecting shaft 343, bearing seat 344, transmission shaft 345, spring 346, sub-door plate 347, sub-counterweight 348, scrap steel material layer 4, material layer surface 41, sealing fan 5, rotation center A, center of gravity B. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, embodiment 1 discloses a scrap steel preheating sealing device 3, comprising a material trough 31, a sealing cover 32 and a fume hood 33 respectively arranged above the material trough 31, and a sealing door group 34 installed on the sealing cover 32 and swingable around a rotation center A, wherein there is at least one set of the sealing door group 34; the sealing door group 34 comprises a sealing door plate 341 arranged at the lower end of the rotation center A and covering the end surface area formed by the sealing cover 32 and the material trough 31, and a balancing unit arranged at the upper end of the rotation center A and offsetting the gravity moment of the sealing door plate 341 in the swinging state; the fume hood 33 is provided with a fume outlet 331.

[0031] Specifically, Figure 1 As shown, the scrap steel conveying direction is from right to left, the flue gas flow direction is from left to right, and two sets of sealing door groups 34 are provided along the scrap steel conveying direction. Figure 2 and Figure 3As shown, the upper end of the sealing door panel 341 is connected to the transmission shaft 345, and the transmission shaft 345 is hinged to the sealing cover 32 through bearing seats 344 respectively installed at both ends. A connecting shaft 343 vertically connected to the transmission shaft 345 is also provided above one end of the transmission shaft 345. The balancing unit is a counterweight 342, which is composed of a plurality of distributed and overlapped pieces of different weight grades and is mounted on the connecting shaft 343.

[0032] The sealing door plate 341 is in a closed state in a free state. Figure 1 As shown, when the scrap steel material layer 4 moves from right to left in the material trough 31, the sealing door plate 341 is opened to the side of the scrap steel conveying direction by the force applied by the scrap steel material layer 4, and the lower end of the sealing door plate 341 is always in close contact with the material layer surface 41, and swings with the fluctuation of the material layer surface 41, playing a good sealing role, and no detection element, drive unit and complex control system are required, no manual intervention is required, the operation is reliable and stable, and the sealing control of the feed port is easy. Since the sealing door plate 341 is an integral structure, the surface is smooth, the strength and rigidity are high, it is not easy to deform, and it does not entangle with the scrap steel, it effectively avoids the feed jam, improves the service life of the entire sealing device, reduces maintenance costs, and increases production efficiency. The counterweight 342 makes the center of gravity B of the sealing door group 34 in the free state be located at 0~h / 2 below the rotation center A, where h is the height of the sealing door panel 341. It is adjusted according to actual needs during the initial installation. After the counterweight 342 is installed, the sealing door panel 341 can automatically return to its original position without hindering the normal transportation of the scrap steel layer 4.

[0033] In this embodiment, two sets of sealing door groups 34 are included, and there are two seals. The sealing defect caused by the uneven surface 41 of the material layer of one set of sealing door groups 34 can be compensated by the other sealing door group 34, thereby achieving a good sealing effect.

[0034] Embodiment 1 discloses an electric arc furnace, comprising an electric arc furnace body 1, a scrap steel preheating device 2 and a scrap steel preheating sealing device 3 disclosed in this embodiment, wherein one end of the scrap steel preheating device 2 is overlapped in the orifice of the electric arc furnace body 1, and the other end is connected to the scrap steel preheating sealing device 3. The high-temperature flue gas generated in the electric arc furnace body 1 flows to the scrap steel preheating sealing device 3 through the scrap steel preheating device 2. Under the sealing effect of the sealing door group 34, the flue gas will not flow directly to the outside through the feed inlet, causing heat loss or air pollution, but will flow from the flue gas outlet 331 into the waste heat recovery, waste gas treatment or dust removal processes, and accordingly, the outside air will not enter the scrap steel preheating sealing device 3 through the feed inlet.

[0035] Embodiment 2:

[0036] like Figure 4As shown, the difference between the second embodiment and the first embodiment is that the sealing door plate 341 is composed of two sub-doors 347 arranged in parallel and independently swingable, and the sub-door plates 347 jointly block the end surface area formed by the sealing cover and the material trough to form a double-door structure; a sub-balancing unit is correspondingly arranged above the sub-door plate 347, and the sub-balancing units together constitute the balancing unit of the sealing door group. In this embodiment, each sub-balancing unit is a sub-counterweight 348, which together constitute the counterweight 342 of the sealing door group 34. When the width of the material trough 31 is large, each sub-door plate can move independently, and the comprehensive sealing effect is better than that of the sealing door group 34 using a single integral structure.

[0037] Embodiment three:

[0038] like Figure 5 As shown, the difference between the third embodiment and the first embodiment is that the balancing unit of the sealing door assembly 34 is a spring 346, one end of the spring 346 is connected to the sealing cover 32, and the other end is connected to the connecting shaft 343. When the spring 346 is in a free extension state, the sealing door plate 341 is in a closed state. Compared with the counterweight 342, the sealing door assembly 34 using the spring 346 as the balancing unit is lighter and more compact.

[0039] Embodiment 4:

[0040] like Figure 6 As shown, the difference between the fourth embodiment and the first embodiment is that the scrap steel preheating sealing device 3 further includes a sealing fan 5 arranged on the sealing cover 32, and a sealing door group 34 is provided on the side of the sealing fan 5 close to the material inlet, and another sealing door group 34 is provided on the side of the sealing fan 5 close to the smoke outlet 331. The sealing fan 5 maintains a negative pressure balance between the smoke outlet 331 and the material inlet, further avoiding gas exchange at the material inlet, and the coordinated use of the sealing fan 5 and the sealing door group 34 is conducive to dynamic sealing control at the material inlet, making up for the shortcomings of real-time control technology.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A scrap steel preheating and sealing device, characterized in that: It includes a material trough, a sealing cover and a smoke hood which are arranged above the material trough in sequence, and a sealing door group which is installed on the sealing cover and can swing around a rotation center point, and there is at least one sealing door group; the sealing door group includes a sealing door plate which is arranged at the lower end of the rotation center point and covers the end surface area formed by the sealing cover and the material trough, and a balancing unit which is arranged at the upper end of the rotation center point and offsets the gravity moment of the sealing door plate in a swinging state; a smoke outlet is provided on the smoke hood; the sealing door plate is composed of at least two sub-door plates which are arranged in parallel and can swing independently, and the sub-door plates jointly block the end surface area formed by the sealing cover and the material trough; a sub-balancing unit is correspondingly arranged above the sub-door plate, and the sub-balancing units together constitute a balancing unit of the sealing door group.

2. The scrap steel preheating and sealing device according to claim 1, characterized in that: The balancing unit is a counterweight, which makes the center of gravity of the sealed door group in a free state located at 0~h / 2 below the rotation center, where h is the height of the sealed door panel.

3. The scrap steel preheating and sealing device according to claim 2, characterized in that: The counterweight is composed of a plurality of blocks which are distributed and overlapped.

4. The scrap steel preheating and sealing device according to claim 1, characterized in that: The balancing unit is an elastic element, and when the elastic element is in a free state, the sealing door panel is closed.

5. The scrap steel preheating and sealing device according to claim 4, characterized in that: The elastic element is a spring with one end connected to the upper end of the rotation center point and the other end connected to the sealing cover.

6. The scrap steel preheating and sealing device according to claim 1, characterized in that: The upper end of the sealing door plate is connected to the transmission shaft, and the transmission shaft is hinged to the sealing cover through bearing seats respectively installed at both ends. A connecting shaft vertically connected to the transmission shaft is also provided above one end of the transmission shaft, and the balancing unit is arranged on the connecting shaft.

7. The scrap steel preheating and sealing device according to claim 1, characterized in that: It also includes a sealing fan arranged on the sealing cover, and at least one set of sealing door group is arranged on the side of the sealing fan close to the feeding port.

8. The scrap steel preheating and sealing device according to any one of claims 1 to 7, characterized in that: The sealing door groups are provided in two sets along the conveying direction of scrap steel.

9. An electric arc furnace, comprising an electric arc furnace body, a scrap steel preheating device and a scrap steel preheating sealing device arranged in sequence, characterized in that: The scrap steel preheating and sealing device is the scrap steel preheating and sealing device according to any one of claims 1 to 7.

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