Light furnace top structure for enhancing performance of fluidized roasting furnace

Abstract

The utility model discloses a light furnace top structure for enhancing the performance of a fluidized roasting furnace. Relates to the roasting furnace top field. Comprising a framework, the framework is a frustum formed by splicing a center steel plate and a plurality of indexing frames, and the indexing frames are fan-shaped; the multiple indexing frames are adjacently spliced in the circumferential direction of the center steel plate. A filling steel plate is also arranged in the indexing frame; through the arrangement of the indexing frame and the ceramic fibers, compared with a structure in the background technology, the structure is lighter; the construction method does not need to depend on a traditional full-chamber scaffold and arch tire construction method, field operation is simplified, and construction efficiency is improved; meanwhile, due to the arrangement of the ceramic fibers, it is guaranteed that the weight of the furnace top is greatly reduced, excellent heat stability, thermal shock resistance and corrosion resistance can still be maintained, high-temperature airflow erosion and thermal shock are effectively resisted, and the safety and stability level of the whole furnace body is improved.

Description

Technical Field

[0001] The utility model relates to the field of roasting furnace tops, in particular to a light furnace top structure for enhancing the performance of a fluidized roasting furnace. Background Art

[0002] As the scale of furnace equipment continues to expand, the stability and safety of the furnace roof structure has become a key issue that needs to be solved urgently, especially in the application field of large metallurgical furnaces. The roasting furnace arch is in a high-temperature operating environment for a long time. It not only has to withstand the erosion and thermal shock of high-temperature airflow, but also needs to take into account good thermal stability, thermal shock resistance and corrosion resistance, which puts strict requirements on materials and design.

[0003] At present, there are two main forms of the vault of the fluidized bed roaster: one is a spherical vault built of special-shaped bricks and arch foot bricks; the other is an integrally cast vault;

[0004] The bricks of the brick vault and arch foot are in rigid contact with the shell, and reinforced steel is also set outside the shell. (See Figure 1 ) Therefore, the brick vault is tightly bound by the steel structure. In actual production, the vault of the fluidized bed roaster is at a temperature of 900 to 1000 degrees. The vault expands due to heat and its expansion force is compressed inside the vault, causing the bricks to squeeze each other (the brick vault has no expansion joints). When the expansion force is greater than the strength of the refractory bricks themselves, the bricks will break.

[0005] Integrally cast vault (see Figure 2 ) requires the configuration of steel bars and steel fibers, so the cast vault has good thermal conductivity but poor insulation effect. However, both the brick vault and the integral cast vault are equipped with a layer of insulating concrete, the purpose of which is to increase the insulation effect of the vault. Whether it is a brick vault or an integral cast vault, its own weight is heavy (the specific gravity of refractory materials is above 2.3). With the large-scale fluidized bed roasting furnace, the weight of the vault itself will increase significantly, which also means that the weight of the vault per unit circumference of the furnace shell will increase significantly, requiring the strength of the furnace shell itself to be greatly improved (one is to increase the thickness of the shell steel plate, and the other is to increase the number of the shell support ribs or increase the specifications of the support ribs).

[0006] Take the 198M2 fluidized bed furnace of the Southern Smelter as an example. It adopts an integrally cast refractory spherical arch design. The weight of the spherical arch itself is about 473 tons. With the loose fill insulation material laid, the total mass increases sharply to about 516 tons. Such a huge weight significantly increases the design challenges of the arch foot structural strength and support system. At the same time, it also brings extremely severe tests and inconveniences to the construction, installation, and daily maintenance and management.

[0007] In the face of these problems, the challenges faced by super-large roasting furnaces are even more severe: the increase in gas flow leads to intensified air flow vibration, and the thermal vibration effect caused by temperature fluctuations further threatens the stability of the furnace structure. In order to meet these challenges, most large roasting furnaces tend to adopt the method of integrally casting refractory materials on site, but this inevitably increases the burden on the furnace shell, forcing designers to increase the thickness of the shell steel plate and add or strengthen the supporting ribs to improve the overall strength of the furnace body.

[0008] In summary, as the furnace roof structure develops towards larger size, how to balance the weight, thermal performance, structural stability and maintenance convenience of the vault has become a core issue that needs to be urgently addressed in the current furnace design and construction. In response to this challenge, it is particularly important to explore new lightweight and high-temperature resistant materials, optimize the vault structure design, and develop efficient construction and maintenance technologies. Utility Model Content

[0009] In order to reduce the weight of the furnace roof and reduce the burden on the furnace shell, while improving the convenience of maintenance, the present application provides a lightweight furnace roof structure that enhances the performance of a fluidized bed roasting furnace.

[0010] The present application provides a lightweight furnace roof structure for enhancing the performance of a fluidized roasting furnace, which adopts the following technical solutions:

[0011] A light furnace roof structure for enhancing the performance of a fluidized roasting furnace comprises a frame, wherein the frame is a frustum formed by splicing a central steel plate and a plurality of indexing frames, wherein the indexing frames are fan-shaped; a plurality of the indexing frames are adjacently spliced ​​along the circumferential direction of the central steel plate; and a steel plate is also arranged in the indexing frames.

[0012] Optionally, the indexing frame includes two straight-side steel sections and two curved steel sections, and the straight-side steel sections and the curved steel sections are spliced ​​end to end to form the indexing frame; the steel plate is filled between the straight-side steel sections and the curved steel sections.

[0013] Optionally, a plurality of reinforcing steels are provided between the two straight-side steels, and two ends of the reinforcing steels are respectively fixedly connected to the two straight-side steels; the plurality of reinforcing steels are arranged at intervals along the length direction of the straight-side steels.

[0014] Optionally, the straight-edge steel section is provided with a rib plate, and the rib plate is lined with a ceramic fiber module and a ceramic fiber blanket.

[0015] Optionally, a hanging piece is further provided on the straight-edge steel; the hanging piece includes a round steel and two wing plates, and the two wing plates are symmetrically arranged on both sides of the round steel; the round steel passes through the rib plate, the ceramic fiber module and the ceramic fiber blanket in a vertical direction.

[0016] In summary, this application includes the following beneficial technical effects:

[0017] The present application is more lightweight than the structure in the background technology through the setting of a dividing frame and ceramic fibers. It does not need to rely on traditional full-bore scaffolding and arch construction methods, which simplifies on-site operations and improves construction efficiency. It makes the overall skeleton more convenient to assemble. At the same time, the setting of ceramic fibers ensures that the furnace top can maintain excellent thermal stability, thermal shock resistance and corrosion resistance while greatly reducing weight, effectively resisting high-temperature airflow erosion and thermal shock, and improving the overall safety and stability of the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a spherical vault built with special-shaped bricks and arch foot bricks in the background art;

[0019] Figure 2 It is a schematic diagram of the overall structure of the integrally cast vault in the background technology;

[0020] Figure 3 It is a schematic diagram of the overall structure of a lightweight furnace roof structure for enhancing the performance of a fluidized roasting furnace according to the present application;

[0021] Figure 4 yes Figure 3 Structural diagram of the middle indexing frame;

[0022] Figure 5 yes Figure 4 Schematic diagram of the structure of the central hanging parts.

[0023] Description of reference numerals:

[0024] 1. Frame; 2. Indexing frame; 21. Straight-edge steel; 211. Rib plate; 22. Curved steel; 23. Reinforced steel; 24. Filling steel plate; 3. Center steel plate; 41. Ceramic fiber blanket; 42. Ceramic fiber module; 43. Hanging parts. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] The embodiment of the present application discloses a light furnace roof structure for enhancing the performance of a fluidized bed roasting furnace, wherein the furnace roof is composed of a skeleton 1, and the skeleton 1 is composed of a central steel plate 3 and a plurality of dividing frames 2 surrounding the central steel plate 3; the dividing frames 2 are fan-shaped, and are adjacently spliced ​​along the circumferential direction of the central steel plate 3; the dividing frames 2 are fan-shaped and formed by the end splicing of two straight-edge steel sections 21 and two curved steel sections 22; a filling steel plate 24 is also provided in the center of the dividing frame 2; when the skeleton 1 is assembled as a whole, it can be connected to the shell of the furnace body.

[0027] In order to strengthen the overall strength of the skeleton 1, the straight-side steel 21 is provided with a rib plate 211; at the same time, a plurality of reinforcing steels 23 are provided between the straight-side steels 21, and the two ends of the reinforcing steels 23 are bolted or welded to the two straight-side steels 21. Furthermore, a plurality of reinforcing steels 23 are arranged at intervals along the length direction of the straight-side steels 21; at the same time, the distance between the reinforcing steels 23 on different dividing frames 2 and the central steel plate 3 should be consistent to improve the overall strength.

[0028] In order to improve the thermal insulation capacity of the skeleton 1, a ceramic fiber module 42 and a ceramic fiber blanket 41 are also lined on the straight-edge steel 21; the ceramic fiber blanket 41 and the ceramic fiber module 42 are fixed to the rib plate 211 through a hanger 43; the hanger 43 includes a round steel and two wing plates, and the two wing plates are symmetrically arranged on both sides of the round steel; one end of the round steel passes through the rib plate 211, the ceramic fiber blanket 41 and the ceramic fiber module 42 and is fixedly connected to the rib plate 211; the fixed connection can be welded; a through hole is opened on the wing plate, and the through hole can be used to hang other components later.

[0029] At the same time, since the ceramic fiber blanket 41 and the ceramic fiber module 42 are separately arranged, if the ceramic fiber blanket 41 and the ceramic fiber module 42 are damaged and need to be replaced separately, the maintenance workload is reduced to a certain extent.

[0030] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lightweight furnace roof structure for enhancing the performance of a fluidized bed roasting furnace, characterized in that: The invention comprises a frame (1), wherein the frame (1) is a frustum formed by splicing a central steel plate (3) and a plurality of indexing frames (2), wherein the indexing frames (2) are fan-shaped; the plurality of indexing frames (2) are adjacently spliced ​​along the circumferential direction of the central steel plate (3); and a filling steel plate (24) is also provided in the indexing frame (2).

2. The lightweight furnace roof structure for enhancing the performance of a fluidized bed roasting furnace according to claim 1, characterized in that: The indexing frame (2) comprises two straight-side steel sections (21) and two curved steel sections (22); the straight-side steel sections (21) and the curved steel sections (22) are spliced ​​end to end to form the indexing frame (2); and the filling steel plate (24) is filled between the straight-side steel sections (21) and the curved steel sections (22).

3. The lightweight furnace roof structure for enhancing the performance of a fluidized bed roasting furnace according to claim 2, characterized in that: A plurality of reinforcing steels (23) are also arranged between the two straight-side steels (21), and the two ends of the reinforcing steels (23) are respectively fixedly connected to the two straight-side steels (21); the plurality of reinforcing steels (23) are arranged at intervals along the length direction of the straight-side steels (21).

4. The lightweight furnace roof structure for enhancing the performance of a fluidized bed roasting furnace according to claim 2, characterized in that: The straight-edge steel (21) is provided with a rib plate (211), and the rib plate (211) is lined with a ceramic fiber module (42) and a ceramic fiber blanket (41).

5. A lightweight furnace roof structure for enhancing the performance of a fluidized bed roasting furnace according to claim 4, characterized in that: The straight-edge steel section (21) is also provided with a hanging member (43); the hanging member (43) comprises a round steel and two wing plates, and the two wing plates are symmetrically arranged on both sides of the round steel; the round steel passes through the rib plate (211), the ceramic fiber module (42) and the ceramic fiber blanket (41) in a vertical direction.

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