Insulating furnace cover of AOD (argon oxygen decarburization) furnace

Abstract

The utility model discloses a heat preservation furnace cover of an AOD (Argon Oxygen Decarburization) furnace, which comprises a lower cover plate (2) covered on the top surface of a furnace mouth (1) of the AOD furnace and an upper cover plate (4) covered on the top surface of a tapping hole (3) of the AOD furnace, a vertical connecting plate (5) is arranged between the upper cover plate (4) and the lower cover plate (2), the connecting plate (5) is attached to the two end surfaces of the tapping hole (3) of the AOD furnace in the overlook direction, and a lifting hook (6) is arranged above the heat preservation furnace cover; an annular surrounding plate (7) is arranged on the top face of the heat preservation furnace cover, the surrounding plate (7) passes through the outer edge of the upper cover plate (4), the outer edge of the lower cover plate (2) and the two ends of the connecting plate (5), a plurality of criss-cross supporting ribs (8) are arranged in the surrounding plate (7), and the surrounding plate (7) is filled with fireproof mud (9). The utility model has the advantage of better heat preservation effect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of AOD furnace of steelmaking, especially relates to an AOD furnace heat preservation furnace cover. BACKGROUND

[0002] AOD furnace is the converter that decarburization and oxidation reduction reaction are carried out through blowing oxygen and argon. The heat generated in the furnace all comes from chemical reaction, and a large amount of alloy and oxygen are consumed in the smelting process. How to improve the thermal efficiency of AOD furnace and reduce the consumption cost of alloy and oxygen has been a subject of metallurgical technical personnel research, and at present, the heat loss in the furnace is reduced and the thermal efficiency of AOD furnace is improved by setting heat preservation furnace cover at the position of the furnace mouth of AOD furnace.

[0003] The existing heat preservation furnace cover, such as the heat preservation cover of application No. 201520605369.5, is cylindrical as a whole, and the bottom surface is flat, which has the defect of poor heat preservation effect when used on AOD furnace, and the main reason is that AOD furnace is tilted out by rotating, as shown in Figs. Figure 4 and Figure 5 , a convex taphole is arranged on one side of the furnace mouth, the taphole is arc-shaped in plan, the inner wall of the taphole is aligned with the inner wall of the furnace body, after the AOD furnace is rotated and tilted, the molten steel flows out from the taphole, which plays a role of flow guiding. The heat preservation furnace cover should be as close as possible to the inner side wall of the taphole when covering the position of the furnace mouth, but due to the large weight of the heat preservation furnace cover, the lifting equipment is used for placing, and it is often difficult to do so in the actual operation process, leaving a gap between the taphole and the heat preservation cover, which creates conditions for heat loss, at the same time, the inner side wall of the taphole is formed by piling up refractory bricks, which is not a smooth arc surface, even if the heat preservation cover is completely attached to the taphole laterally, it is still difficult to completely close the furnace mouth, which also makes it difficult to lock the heat, so that the heat preservation effect of the heat preservation furnace cover is poor. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an AOD furnace heat preservation furnace cover.

[0005] The technical scheme of the utility model: an AOD furnace heat preservation furnace cover, the heat preservation furnace cover comprises a lower cover plate covering the top surface of the furnace mouth of the AOD furnace and an upper cover plate covering the top surface of the taphole of the AOD furnace, a vertical connecting plate is arranged between the upper cover plate and the lower cover plate, the connecting plate is attached to the two end faces of the taphole of the AOD furnace in plan, and a lifting hook is arranged above the heat preservation furnace cover.

[0006] In the foregoing AOD furnace heat preservation furnace cover, an annular coaming is arranged on the top surface of the heat preservation furnace cover, the coaming passes through the outer edge of the upper cover plate, the outer edge of the lower cover plate and the two ends of the connecting plate, a plurality of longitudinal and transverse intersecting support ribs are arranged in the coaming, and the coaming is filled with fireclay.

[0007] The hook is above the center of mass of the heat-insulating furnace cover.

[0008] The hook and the heat-insulating furnace cover are provided with at least three connecting rods, the three connecting rods are evenly distributed around the center of mass of the heat-insulating furnace cover, the upper end of the connecting rod is fixed with the hook, and the lower end of the connecting rod is fixed with the upper cover plate or the lower cover plate.

[0009] Compared with the prior art, the cross section of the heat-insulating furnace cover is Z-shaped, a part of the top surface of the furnace mouth is closed, and the other part covers the top surface of the steel outlet, so that the gap length between the heat-insulating furnace cover and the AOD furnace can be reduced, the channel area of heat loss to the outside is smaller, and the heat preservation effect is better. By optimizing the position of the hook, the heat-insulating furnace cover can be better kept horizontal when being lifted, and can be placed on the AOD furnace more accurately, further reducing the gap width between the heat-insulating furnace cover and the AOD furnace, the channel area of heat loss to the outside is also reduced, and the heat preservation effect of the heat-insulating furnace cover is further improved. The utility model is a technical scheme proposed by the workshop workers according to the technical problems found in the production process, belongs to the workshop technical improvement project, has been put into actual use, and the heat preservation effect has been verified in practice. Therefore, the utility model has the advantages of good heat preservation effect. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the front view schematic diagram of the utility model.

[0011] Figure 2 is the top view schematic diagram of the utility model.

[0012] Figure 3 is the use state diagram of the utility model.

[0013] Figure 4 is the front view schematic diagram of the AOD furnace at the furnace mouth.

[0014] Figure 5 is the top view schematic diagram of the AOD furnace at the furnace mouth.

[0015] The marks in the drawings are: 1-furnace mouth, 2-lower cover plate, 3-steel outlet, 4-upper cover plate, 5-connecting plate, 6-hook, 7-enclosure, 8-supporting rib, 9-fireproof mortar, 10-connecting rod. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings and examples, but not as the basis for limiting the utility model.

[0017] Example. An AOD furnace heat-insulating furnace cover, such as Figure 1 and Figure 2As shown, the heat preservation furnace cover comprises a lower cover plate 2 covering the top surface of the furnace mouth 1 of the AOD furnace and an upper cover plate 4 covering the top surface of the tapping hole 3 of the AOD furnace, a vertical connecting plate 5 is arranged between the upper cover plate 4 and the lower cover plate 2, the connecting plate 5 is attached to the two end faces of the tapping hole 3 of the AOD furnace in the top view, a lifting hook 6 is arranged above the heat preservation furnace cover, and the structure of the lifting hook 6 can also be annular.

[0018] An annular surrounding plate 7 is arranged on the top surface of the heat preservation furnace cover, the surrounding plate 7 passes through the outer edge of the upper cover plate 4, the outer edge of the lower cover plate 2 and the two ends of the connecting plate 5, a plurality of longitudinal and transverse intersecting support ribs 8 are arranged in the surrounding plate 7, and the surrounding plate 7 is filled with fireproof mortar 9.

[0019] The lifting hook 6 is located above the center of gravity of the heat preservation furnace cover. At least three upwardly inclined connecting rods 10 are arranged between the lifting hook 6 and the heat preservation furnace cover, the three connecting rods 10 are uniformly distributed around the center of gravity of the heat preservation furnace cover, the upper ends of the connecting rods 10 are fixed to the lifting hook 6, and the lower ends of the connecting rods 10 are fixed to the upper cover plate 4 or the lower cover plate 2. Such arrangement can keep the heat preservation furnace cover horizontal when hoisted, and can be placed more accurately on the AOD furnace, thereby achieving better heat preservation effect. The lifting hook 6 is kept above the heat preservation furnace cover through the connecting rods 10, and the lifting equipment can be connected to the lifting hook 6.

[0020] The manufacturing method of the heat preservation furnace cover is as follows: the upper cover plate 4 and the lower cover plate 2 are both approximately semicircular steel plates with a thickness of 1 cm. The connecting plate 5 is a rectangular steel plate with a thickness of 1 cm. The upper cover plate 4, the lower cover plate 2 and the connecting plate 5 are welded into an integral structure to obtain assembly one. The connecting rods 10 are welded on the assembly one, the lifting hook 6 is welded on the connecting rods 10 to obtain assembly two. The surrounding plate 7 and the support ribs 8 are welded on the assembly two to obtain assembly three. The assembly three is filled with fireproof mortar, and the filling thickness of the fireproof mortar is about 20 cm. At this time, the support ribs 8 serve as the framework of the fireproof mortar, and the assembly four is obtained. The assembly four is heated at high temperature to sinter the fireproof mortar, and the finished product is obtained.

[0021] Compared with the existing cylindrical heat preservation furnace cover, when the existing heat preservation furnace cover cannot completely adhere to the tapping hole, heat is lost from the gap between the outer side wall of the heat preservation furnace cover and the inner side wall of the tapping hole, and the heat loss channel area is the horizontal cross-sectional arc length of the inner side wall of the tapping hole multiplied by the gap width distance between the inner side wall of the tapping hole and the heat preservation furnace cover. When the heat preservation furnace cover of the utility model cannot completely adhere to the tapping hole, heat can only be lost from the gap between the top view two end faces of the tapping hole and the connecting plate 5, and the heat loss channel area is the height of the tapping hole multiplied by the distance between the end of the tapping hole and the connecting plate 5. Since the height of the tapping hole is significantly smaller than the arc length of the inner side wall of the tapping hole, the heat loss channel area is smaller, and the heat preservation effect is better.

[0022] In addition, when the existing heat preservation furnace cover is used, because the refractory bricks of the inner side wall of the tundish must be staggered in order to manufacture the curved surface for guiding the molten steel, steps are formed, the gap width between the inner side wall of the tundish and the heat preservation furnace cover is large, the channel area of heat loss is increased, and the heat loss channel does not disappear in the ideal placement state (i.e. when the heat preservation furnace cover contacts the inner side wall of the tundish). When the heat preservation furnace cover of the utility model is used, because the refractory bricks of the tundish are not staggered in the top view towards both ends, the tundish is flat in the top view towards both ends, the gap between the end of the tundish and the connecting plate 5 is small, the channel area of heat loss is further reduced, and the heat loss channel can be eliminated in the ideal placement state (i.e. when the connecting plate 5 completely adheres to the end surface of the tundish).

[0023] The utility model is a technical scheme proposed by workshop workers according to technical problems found in the production process, belongs to a workshop technical transformation project, and the obtained heat preservation furnace cover has been put into actual use and has good heat preservation effect.

[0024] In the description of the utility model, it should be understood that the positions or location relations indicated by the terms "upper", "lower", "front", "rear", "left", "right" and the like are based on the positions or location relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the utility model.

Claims

1. An AOD furnace holding lid characterized by: The heat preservation furnace cover comprises a lower cover plate (2) covering the top surface of the furnace mouth (1) of the AOD furnace and an upper cover plate (4) covering the top surface of the tapping hole (3) of the AOD furnace, a vertical connecting plate (5) is arranged between the upper cover plate (4) and the lower cover plate (2), the connecting plate (5) is attached to the two end faces of the AOD furnace tapping hole (3) in the top view, and a lifting hook (6) is arranged above the heat preservation furnace cover.

2. The AOD vessel cover as claimed in claim 1, wherein: An annular coaming (7) is arranged on the top surface of the heat preservation furnace cover, the coaming (7) passes through the outer edge of the upper cover plate (4), the outer edge of the lower cover plate (2) and the two ends of the connecting plate (5), a plurality of longitudinal and transverse intersecting support ribs (8) are arranged in the coaming (7), and the coaming (7) is filled with fireproof mortar (9).

3. The AOD vessel cover as claimed in claim 1, wherein: The lifting hook (6) is located above the center of mass of the heat preservation furnace cover.

4. The AOD vessel cover as claimed in claim 3, characterized in that: At least three connecting rods (10) are arranged between the lifting hook (6) and the heat preservation furnace cover, the three connecting rods (10) are uniformly distributed in the circumferential direction around the center of mass of the heat preservation furnace cover, the upper end of the connecting rod (10) is fixed to the lifting hook (6), and the lower end of the connecting rod (10) is fixed to the upper cover plate (4) or the lower cover plate (2).

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