Blast furnace tapping area and its iron trough top leveling platform

Abstract

This utility model proposes a blast furnace tapping area and a platform for leveling the top of its iron trough. The platform comprises multiple pre-cast modules connected in sequence. Adjacent pre-cast modules are secured with tongue-and-groove fasteners, and the gaps between adjacent modules are filled with fiber blankets. Each pre-cast module includes a steel structural support frame and a refractory castable layer cast on top of the steel structural support frame. This platform replaces the traditional on-site fabrication method for leveling with offline modular customization, shortening the on-site construction period and reducing costs, while also facilitating subsequent maintenance and repair of the tapping area platform.

Description

Technical Field

[0001] This utility model relates to the field of bridge corrosion protection technology, and in particular to a blast furnace tapping area and a flattening platform for the top of the iron trough. Background Technology

[0002] The blast furnace body is an important part of ensuring the blast furnace smelting process, and the blast furnace tapping area is the core area in the blast furnace ironmaking process. It is mainly responsible for regularly discharging the molten iron and slag generated in the blast furnace and carrying out preliminary treatment.

[0003] The leveling of the tapping area is a development trend in ironmaking technology. Old-style sloping tapping platforms, with their numerous holes, steps, and uneven surfaces, are unfavorable for the movement of maintenance machinery and the upkeep of slag and iron trenches. They also hinder the collection of dust and fumes in front of the furnace, as blast furnaces produce iron almost continuously, placing the area in front of the furnace in a high-temperature zone. To protect operators from the intense heat, many older blast furnace tapping areas are semi-enclosed, with the upper half of the platform enclosed and the lower half open for ventilation and heat dissipation. This type of tapping area maintenance results in dust and fumes easily leaking out of the tapping area and also accumulating and floating in the upper part of the area, causing pollution to the tapping area and the surrounding environment.

[0004] The advantages of leveling the blast furnace tapping area are as follows:

[0005] (1) The top of the slag and iron trench cover is flush with the surface of the platform and does not affect the movement of excavators or maintenance vehicles.

[0006] (2) The slag and iron trench is completely hidden below the platform. During maintenance, the trench cover can be lifted open and the excavator can enter the trench for maintenance.

[0007] (3) Dust removal ducts can be buried on the side wall of the ditch to remove the smoke and dust in the ditch.

[0008] (4) The furnace platform has a flat and neat surface, a beautiful layout, and a greatly improved operating environment.

[0009] Currently, there are generally two methods for leveling traditional sloping tapping areas: The first is sand filling, which involves filling the tapping area with river sand to the same elevation, and then laying bricks or pouring concrete on the surface. This method is relatively simple, but it significantly increases the platform load, requiring reinforcement of the tapping platform beams and columns. The second method involves raising the tapping platform columns to the required leveling elevation before pouring the platform surface. This method does not significantly increase the tapping platform load; however, it requires the existing tapping area to malfunction, thus affecting the normal operation of the blast furnace and having a significant impact on the existing tapping area. It also has the disadvantage of a long construction period. Utility Model Content

[0010] The main purpose of this utility model is to provide a blast furnace tapping area and a flattening platform for the top of the iron trough, which aims to reduce the on-site construction period and thus minimize the economic impact of blast furnace shutdown.

[0011] To achieve the above objectives, this utility model provides a flattening platform for the top of the iron trough in the blast furnace tapping area, comprising multiple precast modules connected in sequence. Adjacent precast modules are fastened together by tongue and groove joint fasteners. The gaps between adjacent precast modules are filled with fiber blankets. Each precast module includes a steel structure support frame and a refractory castable layer cast on top of the steel structure support frame.

[0012] Preferably, the fiber blanket is filled with cast-in-place heat-resistant concrete to fill the gap between two adjacent precast modules.

[0013] Preferably, the fastener is a connecting bolt, which passes through the tongue and groove of two adjacent precast modules to fasten them together.

[0014] Preferably, the steel structure support frame includes a steel structure floor slab, support columns supported below the steel structure floor slab, and support rods connecting the support columns and the steel structure formwork.

[0015] Preferably, the steel structure support frame further includes multiple reinforcing ribs located below the steel structure floor slab.

[0016] Preferably, the cross-section of the reinforcing rib is L-shaped.

[0017] Preferably, the support columns, support rods, and reinforcing ribs are all connected to the steel structure floor slab by welding.

[0018] Preferably, a connecting plate is welded to the bottom of the support column, and the connecting plate has through holes for the rebar to pass through and be inserted into the original platform column of the iron yard.

[0019] Preferably, the steel structure support frame further includes reinforcing rods connecting the support rods and the bottom wall of the steel structure floor slab.

[0020] This utility model further proposes a blast furnace tapping area, including the aforementioned iron trough top flattening platform, and also including the blast furnace main trough, blast furnace slag trough and blast furnace iron trough connected in sequence, with the support column of the iron trough top flattening platform fixed above the platform column of the blast furnace iron trough.

[0021] The flattening platform at the top of the iron trough in the blast furnace tapping area proposed in this utility model has the following beneficial effects:

[0022] 1. Since most of the structure is precast, the amount of on-site casting work is greatly reduced, which in turn greatly reduces the installation period and minimizes the economic impact of blast furnace shutdown.

[0023] 2. Because adjacent precast modules are connected by fasteners, the maintenance and repair of the iron tapping platform is more convenient and the maintenance and repair costs are lower compared to the cast-in-place platform that is cast in a unified manner.

[0024] 3. The iron trench top leveling platform has the advantages of simple and convenient construction, stable structure and easy implementation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the flattening platform at the top of the iron trough in the blast furnace tapping area of ​​this utility model.

[0026] Figure 2 This is a schematic diagram of the structure of the first precast module in the iron trough top flattening platform of the blast furnace tapping area of ​​this utility model.

[0027] Figure 3 This is a schematic diagram of the structure of the second precast module in the iron trough top flattening platform of the blast furnace tapping area of ​​this utility model.

[0028] Figure 4 This is a partial structural diagram of the connection between two precast modules in the flattening platform at the top of the iron trough in the blast furnace tapping area of ​​this utility model.

[0029] Figure 5 This is a schematic diagram of the blast furnace tapping area of ​​this utility model.

[0030] In the diagram, 1-original platform column of the tapping area; 2-embedded foundation; 3-first precast module; 4-original platform of the tapping area; 5-second precast module; 6-fiber blanket; 7-fastener; 8-support column; 9-refractory castable layer; 10-support rod; 11-reinforcing rib; 12-steel structure floor slab; 13-installation hole; 14-blast furnace taphole; 15-blast furnace main trough; 16-blast furnace slag trough; 17-blast furnace skimmer; 18-blast furnace iron trough; 19-flattened platform at the top of the iron trough.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0033] It should be noted that in the description of this utility model, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] This utility model proposes a flattening platform for the top of the iron trough in the blast furnace tapping area.

[0035] Reference Figures 1 to 4 In this preferred embodiment, a flattening platform at the top of the iron trough in a blast furnace tapping area includes multiple precast modules connected in sequence. Adjacent precast modules are fastened by overlapping fasteners 7 through tongue and groove joints (with mounting holes 13 on the tongue and groove joints). The gaps between adjacent precast modules are filled with fiber blankets 6. Each precast module includes a steel structure support frame and a refractory castable layer 9 cast on top of the steel structure support frame (the refractory castable can be made of conventional materials in the prior art, and this utility model does not limit this).

[0036] Reference Figure 2 and Figure 3 This embodiment uses the connection between the first precast module 3 and the second precast module 5 as an example to specifically illustrate the connection structure between two adjacent precast modules.

[0037] Furthermore, cast-in-place heat-resistant concrete is filled on top of the fiber blanket 6 to fill the gaps between adjacent precast modules. By using cast-in-place heat-resistant concrete to fill the gaps between adjacent precast modules, the sealing performance of the flattened platform at the top of the iron trough is further improved, preventing the temperature of the high-temperature molten iron below from being conducted to the top through the gaps.

[0038] In this embodiment, the fastener 7 is a connecting bolt. The connecting bolt passes through the tongue and groove of two adjacent precast modules to fasten them together, which makes it easy to disassemble during subsequent maintenance.

[0039] Reference Figure 2 and Figure 3 In this embodiment, the steel structure support frame includes a steel structure floor slab 12, support columns 8 supported below the steel structure floor slab 12, and support rods 10 connecting the support columns 8 and the steel structure formwork. Because the dimensions of the first precast module 3 and the second precast module 5 need to correspond to the original platform columns 1 of the iron tapping yard below, the details of their support columns 8 are slightly different (specifically, in terms of quantity and height).

[0040] Furthermore, the steel structure support frame also includes multiple reinforcing ribs 11 located below the steel structure floor slab 12. The cross-section of the reinforcing ribs 11 is L-shaped. By setting multiple reinforcing ribs 11, the structural stability of the steel structure support frame is improved.

[0041] Specifically, the support column 8, support rod 10, and reinforcing rib 11 are all connected to the steel structure floor slab 12 by welding. Welded connections have the advantage of being simple and convenient to install.

[0042] In this embodiment, a connecting plate is welded below the support column 8, and the connecting plate has through holes for the rebar to pass through and be inserted into the original platform column 1 of the iron yard.

[0043] Furthermore, the steel structure support frame also includes reinforcing bars connecting the support rod 10 and the bottom wall of the steel structure floor slab 12. By installing reinforcing bars, the structural strength of the steel structure support frame is further improved.

[0044] The flattening platform at the top of the iron trough needs to be designed according to the layout of the iron tapping area, including the layout of the slag and iron trough, the layout of the iron tapping ladle, and the elevation of the iron tapping area. In particular, when converting a sloping iron tapping area platform into a flat iron tapping area platform, it is necessary to accurately grasp the elevation and slope of the iron tapping area to ensure the precise and reasonable production of each precast module, minimizing the number and area of ​​irregularly shaped precast modules. At the same time, the material of the precast modules should be selected according to the location of the slag and iron trough and the iron tapping ladle. Finally, based on the module size and material, production should be completed before the blast furnace is shut down.

[0045] The installation process of the leveling platform at the top of this iron trench is as follows:

[0046] 1. Before shutting down the blast furnace, anchor bolts are pre-embedded on the iron tapping platform. When the blast furnace is shut down, all the precast modules can be hoisted onto the platform.

[0047] 2. Install each precast module according to the position of the pre-embedded bolts. Install all precast modules in sequence along the length of the iron trench. After the tongue and groove of two adjacent precast modules are tightened with fastening bolts, fill the gap at the connection point with fiber blanket 6. Finally, pour heat-resistant concrete on top of fiber blanket 6.

[0048] Traditional leveling treatment requires a blast furnace shutdown of approximately 30 to 50 days, while using the iron trough top leveling platform, the iron tapping area leveling treatment can be completed in just 10 days. Furthermore, the subsequent maintenance and repair of the iron tapping area platform is more convenient and the maintenance and repair costs are lower.

[0049] The flattening platform at the top of the iron trough in the blast furnace tapping area proposed in this embodiment has the following beneficial effects:

[0050] 1. Since most of the structure is precast, the amount of on-site casting work is greatly reduced, which in turn greatly reduces the installation period and minimizes the economic impact of blast furnace shutdown.

[0051] 2. Because the two adjacent precast modules are connected by fasteners 7, the maintenance and repair of the iron tapping platform is more convenient and the maintenance and repair costs are lower compared to the cast-in-place platform with uniform casting.

[0052] 3. The iron trench top leveling platform has the advantages of simple and convenient construction, stable structure and easy implementation.

[0053] This utility model further proposes a blast furnace tapping area.

[0054] Reference Figure 5 In this preferred embodiment, a blast furnace tapping area includes a leveling platform at the top of the iron trough, and further includes a main blast furnace trough 15, a blast furnace slag trough 16, and a blast furnace iron trough 18 connected in sequence. The support column 8 of the leveling platform at the top of the iron trough is fixed above the platform column of the blast furnace iron trough. The specific structure and beneficial effects of the leveling platform at the top of the iron trough are the same as those in the above embodiment, and will not be repeated here.

[0055] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A flattening platform at the top of the iron trough in a blast furnace tapping area, characterized in that, It includes multiple precast modules connected in sequence. Adjacent precast modules are fastened together by tongue and groove fasteners. The gaps between adjacent precast modules are filled with fiber blankets. The precast module includes a steel structure support frame and a refractory castable layer cast on top of the steel structure support frame.

2. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 1, characterized in that, The fiber blanket is filled with cast-in-place heat-resistant concrete to fill the gap between two adjacent precast modules.

3. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 1, characterized in that, The fastener is a connecting bolt, which passes through the tongue and groove of two adjacent precast modules to fasten them together.

4. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 1, characterized in that, The steel structure support frame includes a steel structure floor slab, support columns supporting the steel structure floor slab, and support rods connecting the support columns and the steel structure formwork.

5. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 4, characterized in that, The steel structure support frame also includes multiple reinforcing ribs located below the steel structure floor slab.

6. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 5, characterized in that, The cross-section of the reinforcing rib is L-shaped.

7. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 5, characterized in that, The supporting columns, supporting rods, and reinforcing ribs are all connected to the steel structure floor slab by welding.

8. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in claim 4, characterized in that, A connecting plate is welded to the bottom of the support column, and the connecting plate has through holes for the rebar to pass through and be inserted into the original platform column of the iron yard.

9. The flattening platform at the top of the iron trough in the blast furnace tapping area as described in any one of claims 4 to 8, characterized in that, The steel structure support frame also includes reinforcing rods that connect the support rods and the bottom wall of the steel structure floor slab.

10. A blast furnace tapping area, characterized in that, The system includes the iron trough top flattening platform as described in any one of claims 1 to 9, and further includes the blast furnace main trough, the blast furnace slag trough, and the blast furnace iron trough connected in sequence, with the support columns of the iron trough top flattening platform fixed above the platform columns of the blast furnace iron trough.

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