Protective shed for overhaul of iron-making blast furnace body

Abstract

The utility model belongs to the technical field of blast furnace overhaul, and particularly relates to a protective shed for overhaul of an iron-making blast furnace body, which is characterized by comprising a cross beam, a longitudinal beam and a cover plate, the two ends of the cross beam are welded and fixed with the inner side of the furnace waist position of the blast furnace body, and the longitudinal beam is vertically erected and fixed on the upper surface of the cross beam. The transverse beams and the longitudinal beams form a latticed main beam structure, the cover plate is laid on the upper surfaces of the longitudinal beams, a plurality of reinforced ribs are arranged at the bottom of the cover plate, the height of the reinforced ribs is larger than that of the longitudinal beams, and the two ends of each reinforced rib are clamped between every two adjacent transverse beams. The protective shed has the beneficial effects that the protective shed is arranged at the furnace waist position in the middle of the blast furnace shell, so that an upper working surface and a lower working surface are formed in the blast furnace and can be constructed simultaneously, the construction period is shortened, the construction is convenient, the requirements can be met, the construction efficiency of overhaul of a blast furnace body is improved, the labor intensity is reduced, and the safety and the quality of construction operation are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace major repairs, and particularly relates to a protection shed for the major repair of the furnace body of an iron-making blast furnace. Background Art

[0002] In the metallurgical industry, blast furnaces in iron-making plants are developing towards larger sizes. Currently, most of the blast furnaces in large domestic steel enterprises have a specification of more than 3000m 3 above. When major repairs are carried out on the furnace body of a large blast furnace, the project volume is large and the construction period is long. The length of the construction period directly affects the output of pig iron, and all steel plants attach great importance to this.

[0003] Conventional major repairs refer to a planned maintenance that involves cleaning blast furnace equipment and performing partial replacement and repair. Major repairs are one of the necessary means to maintain the stable operation of blast furnaces. Generally speaking, the major repair cycle of a blast furnace is 4 - 6 years. However, in reality, the major repair cycle will vary flexibly according to specific circumstances.

[0004] The major repair cycles of different blast furnaces vary, which is related to various factors. First of all, the annual operating time of the blast furnace is one of the important factors affecting the major repair cycle. If the blast furnace operates for a long time, major repairs need to be carried out more frequently to ensure the stable operation of the equipment. Secondly, production requirements also affect the major repair cycle. When production tasks are intense, the major repair cycle needs to be appropriately extended. On the contrary, when production tasks are relatively loose, the major repair cycle can be shortened. Finally, the selected technical solution also affects the major repair cycle. Different technical solutions result in different major repair cycles.

[0005] The Chinese utility model patent with the application number 202222591522.6 discloses a furnace shell hoisting device for blast furnace major repairs. The load-bearing beam is arranged below the large platform of the furnace body frame. A track beam is arranged below the load-bearing beam, and an electric hoist is arranged below the track beam. Moreover, car stops are arranged at both the head and tail ends of the track beam. The load-bearing beam connects the secondary beam and the main beam of the large platform. A first support frame is arranged on the side of the load-bearing beam close to the blast furnace tapping yard, and a knee brace is arranged between the first support frame and the large platform of the furnace body frame. Its load-bearing beam and electric hoist can be slightly modified to be applicable to the replacement of furnace shells during major repairs of blast furnaces with various furnace volumes. Two load-bearing beams and two track beams can be installed in advance before the blast furnace is shut down for major repairs, saving the construction period of blast furnace major repairs. This solution mainly solves the hoisting problem during blast furnace major repairs, and its role in improving construction efficiency is limited, and it still cannot fundamentally achieve the purpose of shortening the major repair cycle. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a protection shed for the major overhaul of the blast furnace body, overcoming the deficiencies of the prior art. By setting a protection shed at the furnace waist in the middle of the blast furnace shell, two working surfaces are formed inside the blast furnace. The structure is simple, easy to install and can meet the usage requirements. Increasing the working surface is an effective means to shorten the construction period of the major overhaul of the blast furnace body, and the construction time can be shortened by half.

[0007] To achieve the above purpose, the present utility model is realized through the following technical solutions:

[0008] A protection shed for the major overhaul of the blast furnace body, characterized in that it includes cross beams, longitudinal beams and cover plates. The two ends of the cross beams are welded and fixed to the inner side of the furnace waist position of the blast furnace body. The longitudinal beams are vertically erected and fixed on the upper surface of the cross beams. A number of cross beams and longitudinal beams form a grid-like main beam structure. The cover plates are laid on the upper surface of the longitudinal beams. A plurality of stiffening ribs are provided at the bottom of the cover plates. The height of the stiffening ribs is greater than the height of the longitudinal beams, and both ends of the stiffening ribs are clamped between two adjacent cross beams.

[0009] The cover plate and the longitudinal beam are connected by fillet welds or bolts. The cover plate completely covers the furnace waist position of the blast furnace body, and a working surface space is formed above and below the cover plate respectively.

[0010] The cross beams and longitudinal beams are made of any one or any two combinations of H-shaped steel, I-shaped steel or channel steel.

[0011] The fillet welds are intermittent welds, and not less than 500 mm within each meter length.

[0012] The water-cooled walls at the connection positions of the two ends of the cross beams and the furnace waist are removed before welding.

[0013] No secondary beams are provided in the main beam structure.

[0014] The size of the grid is 2 meters to 3 meters square.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] 1) By setting a protection shed at the furnace waist position in the middle of the blast furnace shell, two upper and lower working surfaces are formed inside the blast furnace, and construction can be carried out simultaneously, thereby shortening the construction period. The structure is simple, the construction is convenient and can meet the requirements, improving the construction efficiency of the major overhaul of the blast furnace body, reducing the labor intensity, and ensuring the safety and quality of the construction operation.

[0017] 2) The protection shed is mainly made of H-shaped steel and steel plates. It is welded and fixed to the blast furnace shell through the H-shaped steel main beam. There is no secondary beam in the structure, and the structure is greatly simplified. The stiffening ribs provided on the cover plate, on the one hand, strengthen the strength and stiffness of the cover plate, and on the other hand, replace the secondary beam structure, thus realizing rapid construction. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the position of the embodiment of the present utility model inside the blast furnace;

[0019] Figure 2 It is a schematic diagram of the main beam structure in the embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of the laying state of the cover plate in the embodiment of the present utility model.

[0021] In the figure: 1 - cross beam, 2 - longitudinal beam, 3 - cover plate, 4 - blast furnace body, 5 - stiffening rib, 6 - water wall. Specific embodiments

[0022] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments.

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the specific embodiments required for use in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other specific embodiments can also be obtained based on these specific embodiments.

[0024] Generally, the components of the embodiments of the present utility model described and shown in the specific embodiments here can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the specific embodiments is not intended to limit the scope of the claimed present utility model, but only represents the selected embodiments of the present utility model.

[0025] See Figures 1-3, which is a schematic structural diagram of an embodiment of a protective shed for the major overhaul of a blast furnace body of the present utility model, includes a cross beam 1, a longitudinal beam 2 and a cover plate 3. The two ends of the cross beam 1 are welded and fixed to the inner side of the waist position of the blast furnace body 4. The longitudinal beam 2 is vertically erected and fixed on the upper surface of the cross beam 1. A number of cross beams 1 and longitudinal beams 2 form a grid-like main beam structure, and the size of the grid is 2 meters to 3 meters square. The size of the cover plate 3 is the same as that of the grid, forming a closed effect. The advantage of the solution of the present utility model is that no secondary beam is provided in the main beam structure, thus greatly simplifying the structure of the protective shed body. The cover plate 3 is laid on the upper surface of the longitudinal beam 2. A plurality of stiffening ribs 5 are provided at the bottom of the cover plate 3. The height of the stiffening ribs 5 is greater than the height of the longitudinal beam 2, and both ends of the stiffening ribs 5 are stuck between two adjacent cross beams 1. The cover plate 3 and the longitudinal beam 2 are connected by fillet welds or bolts. The fillet welds are intermittent welds, not less than 500 mm per meter in length. The cross beam 1 and the longitudinal beam 2 are made of any one or any two combinations of H-shaped steel, I-shaped steel or channel steel, preferably H-shaped steel.

[0026] The cover plate 3 completely covers the waist position of the blast furnace body 4. A working surface space is formed above and below the cover plate 3. The stiffening ribs 5 provided on the lower surface of the cover plate 3 strengthen the strength and stiffness of the cover plate 3, meet the construction requirements, and thus realize rapid construction.

[0027] The water-cooled walls at the connection positions of the two ends of the cross beam 1 with the waist position need to be removed before welding, while the upper and lower water-cooled walls 6 do not need to be removed on the premise of not affecting the installation.

[0028] In the embodiment, the cross beam 1 and the longitudinal beam 2 are made of HM450*300*11*18 profiles, and the material is Q355B. The cover plate 3 is made of a 10-mm thick steel plate with the material of Q355B, and the thickness of the stiffening rib 5 is 10 mm, meeting the strength requirements. After the protective shed is installed, construction operations can be carried out simultaneously above and below the protective shed inside the blast furnace shell. By increasing the working surface, rapid construction is realized, thus achieving the purpose of shortening the construction period.

[0029] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A protective shed for overhauling an ironmaking blast furnace, characterized in that: It includes a crossbeam, a longitudinal beam and a cover plate. The two ends of the crossbeam are welded and fixed to the inner side of the waist of the blast furnace body. The longitudinal beam is vertically erected and fixed on the upper surface of the crossbeam. Several crossbeams and longitudinal beams form a grid-like main beam structure. The cover plate is laid on the upper surface of the longitudinal beam. A plurality of reinforcing ribs are provided at the bottom of the cover plate. The height of the reinforcing ribs is greater than the height of the longitudinal beam, and the two ends of the reinforcing ribs are stuck between two adjacent crossbeams.

2. A protective shed for overhauling an ironmaking blast furnace according to claim 1, characterized in that: The cover plate is connected to the longitudinal beam by fillet welds or bolts. The cover plate completely covers the waist of the blast furnace body, and a working surface space is formed above and below the cover plate.

3. A protective shed for overhauling an ironmaking blast furnace according to claim 1, characterized in that: The cross beam and the longitudinal beam are made of any one of H-shaped steel, I-shaped steel or channel steel or a combination of any two of them.

4. A protective shed for overhauling an ironmaking blast furnace according to claim 2, characterized in that: The fillet weld is intermittently welded and is not less than 500 mm per meter in length.

5. A protective shed for overhauling an ironmaking blast furnace according to claim 1, characterized in that: The water-cooled walls at the connection between the two ends of the crossbeam and the furnace waist are removed before welding.

6. A protective shed for overhauling an ironmaking blast furnace according to claim 1, characterized in that: No secondary beam is arranged in the main beam structure.

7. A protective shed for overhauling an ironmaking blast furnace according to claim 1, characterized in that: The size of the grid is 2 to 3 meters square.

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