A furnace support column structure for a calcining furnace

Abstract

This invention discloses a furnace-protecting column structure for a calcining furnace, relating to the technical field of steel supporting structures for calcining furnaces. The invention includes a furnace-protecting column body, with supporting angle steel welded to its outer surface. Bending-resistant steel plates are welded to both sides of the supporting angle steel and fixedly welded to the furnace-protecting column body. Supporting steel pipes are inserted above and below the outer surface of the furnace-protecting column body, with reinforcing steel plates welded to the outer ring of each pipe and fixedly welded to the furnace-protecting column body. This invention, through the arrangement of the furnace-protecting column body, first reinforcing steel plate, second reinforcing steel plate, and third reinforcing steel plate, and using 16mm thick H-shaped steel for the furnace-protecting column body, combined with the segmented arrangement of the first, second, and third reinforcing steel plates, helps to improve the overall structural rigidity of the furnace-protecting column and reduce inconsistent vertical deformation of the furnace-protecting column under the expansion load of the furnace body.

Description

Technical Field

[0001] This invention relates to the technical field of steel supporting structures for calcining furnaces, specifically a furnace protection column structure for calcining furnaces. Background Technology

[0002] The pot furnace is a widely used thermal equipment in the carbon industry, mainly used for the high-temperature calcination of carbon raw materials. It relies on flues on both sides of the pot for indirect heat transfer. Raw materials enter the pot from the top and move downwards under gravity, undergoing physical and chemical transformations at a high temperature of 1200-1300℃. Volatile matter released during calcination can be fed into the flues for combustion, achieving self-heating. After calcination, the material is cooled and discharged from the furnace. The pot furnace body is composed of a refractory lining and an external metal frame. With increasing production capacity, pot furnaces are gradually becoming larger, resulting in a greater overall size. Significant thermal expansion occurs during the drying and production operation phases.

[0003] Furnace support columns are key components of the external metal frame of a pot-type calcining furnace. They are typically located on the outside of the furnace body and, together with cross bracing and other components, provide lateral restraint and support to the furnace wall structure. They withstand the lateral forces caused by the furnace's thermal expansion, maintain the overall shape of the external steel frame, and play a crucial role in ensuring the stable operation of the calcining furnace. Traditional furnace support columns often consist of two 28# channel steel columns arranged back-to-back, welded together with 10mm thick connecting plates to bear various loads transmitted by the furnace body.

[0004] Existing tank-type calcining furnaces are developing towards larger sizes, resulting in increased overall furnace dimensions and a corresponding increase in the expansion of the furnace body during the drying process. For example... Figures 1-3 As shown, the traditional furnace support column, which is welded from two 28# back-to-back channel steels with 10mm connecting plates, is prone to inconsistent vertical deformation under the expansion load of the furnace body. The existence of the above problems will reduce the working reliability of the furnace support column, and thus have an adverse effect on the service life of the tank calcining furnace. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a furnace protection column structure for a calcining furnace to solve the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a furnace protection column structure for a calcining furnace, comprising a furnace protection column body, a supporting angle steel welded to the outer surface of the furnace protection column body, and anti-bending steel plates welded to both sides of the supporting angle steel, the anti-bending steel plates being welded and fixed to the furnace protection column body, supporting steel pipes passing through the upper and lower outer surfaces of the furnace protection column body, reinforcing steel plates welded to the outer rings of the two supporting steel pipes, the reinforcing steel plates being welded and fixed to the furnace protection column body, a first reinforcing steel plate and a second reinforcing steel plate welded to both sides of the furnace protection column body, a third reinforcing steel plate welded between the first reinforcing steel plate, the second reinforcing steel plate and the furnace protection column body, reinforcing ribs welded to the bottom of the first reinforcing steel plate and the top of the second reinforcing steel plate, the reinforcing ribs being welded and fixed to the furnace protection column body, a plurality of first through holes being opened at the top of the first reinforcing steel plate, and a plurality of second through holes being opened at the bottom of the second reinforcing steel plate.

[0007] By adopting the above technical solution, the main body of the furnace support column, together with the anti-bending steel plate, supporting steel pipe, reinforcing steel plate and multiple reinforced steel plates, forms the overall structure of the furnace support column. The anti-bending steel plate can reinforce the supporting angle steel, the supporting steel pipe and reinforcing steel plate improve the stress state at the assembly position of the cross tie rod, and the multiple reinforced steel plates enhance the overall rigidity of the column. The first and second through holes enable the cavity to connect with the outside world, and the reinforcing ribs reinforce the openings, which helps to reduce the inconsistency of vertical deformation and stress concentration cracking at the openings of the furnace support column.

[0008] Furthermore, multiple first reinforcing steel plates, second reinforcing steel plates, third reinforcing steel plates, and reinforcing ribs are provided, and multiple first reinforcing steel plates, second reinforcing steel plates, and third reinforcing steel plates are distributed at equal intervals.

[0009] By adopting the above technical solution, multiple sets of reinforcing steel plates are arranged at equal intervals along the height of the furnace protection column, which can evenly distribute the lateral load along the height of the column, further improve the structural strength of the furnace protection column at different heights, and reduce the probability of deformation in local locations.

[0010] Furthermore, multiple sets of the first and second through holes are provided, with four to eight in each set. The diameter of the first and second through holes is 2mm to 10mm, and the first and second through holes are staggered.

[0011] By adopting the above technical solution, the first through hole and the second through hole are staggered, which can change the airflow path inside the chamber and expand the gas flow range. This helps to reduce the weakening of the structural strength of the reinforced steel plate by the opening while ensuring ventilation, pressure relief and heat dissipation.

[0012] Furthermore, the reinforcing rib is in the shape of a grid, and the first and second through holes correspond to the positions of the hollowed-out parts of the grid-shaped reinforcing rib. The length, width and wall thickness of the grid-shaped reinforcing rib are 97mm*268mm*5mm.

[0013] By adopting the above technical solution, the grid-shaped reinforcing ribs avoid the first and second through holes by relying on the hollow positions, which will not block the gas flow, effectively reinforce the area around the through holes, disperse the stress at the opening position, and reduce the phenomenon of deformation and cracking at the opening position.

[0014] Furthermore, the main body of the furnace protection column is made of H-shaped steel, and the length, width, height and wall thickness of the main body of the furnace protection column are 8610mm*300mm*230mm*16mm.

[0015] By adopting the above technical solution, compared with the traditional channel steel composite structure, the load-bearing capacity of the furnace support column itself can be improved, and the vertical deformation of the furnace support column under the action of furnace body expansion load can be reduced.

[0016] Furthermore, the length, width, height, and wall thickness of the supporting angle steel are 180mm*100mm*100mm*10mm, and the bending steel plate is triangular, with a length, width, and wall thickness of 100mm*100mm*10mm.

[0017] By adopting the above technical solution, triangular anti-bending steel plates are welded to both sides of the supporting angle steel, which can achieve lateral reinforcement of the supporting angle steel and reduce the phenomenon of bending deformation when the supporting angle steel is subjected to lateral loads.

[0018] Furthermore, the diameter, wall thickness, and length of the supporting steel pipe are ∅76mm*6mm*320mm, and the length, width, and wall thickness of the reinforcing steel plate are 180mm*180mm*10mm.

[0019] By adopting the above technical solution, the horizontal tie rod can be inserted inside the supporting steel pipe. The supporting steel pipe increases the contact bearing area of ​​the horizontal tie rod, disperses the shear load borne by the horizontal tie rod, and the reinforcing steel plate strengthens the area around the opening of the furnace protection column, reducing the probability of structural damage at the opening position of the column.

[0020] Furthermore, the length, width, and wall thickness of the first and second reinforcing steel plates are 107mm*268mm*10mm, and the length, width, and wall thickness of the third reinforcing steel plate are 180mm*268mm*10mm.

[0021] By adopting the above technical solution, the first reinforcing steel plate, the second reinforcing steel plate and the third reinforcing steel plate work together to form a segmented reinforcement structure on both sides of the main body of the furnace protection column, thereby improving the overall resistance to lateral deformation of the furnace protection column.

[0022] Furthermore, the main body of the furnace support column, the supporting angle steel, the bending steel plate, the supporting steel pipe, the reinforcing steel plate, the first reinforcing steel plate, the second reinforcing steel plate, the third reinforcing steel plate, and the reinforcing ribs are all made of Q235 material.

[0023] By adopting the above technical solutions and unifying the processing materials of each component, Q235 material has good structural mechanical properties, which helps to meet the overall strength requirements of the furnace support column.

[0024] Furthermore, the main body of the furnace support column, the supporting angle steel, the bending steel plate, the supporting steel pipe, the reinforcing steel plate, the first reinforcing steel plate, the second reinforcing steel plate, the third reinforcing steel plate and the reinforcing rib are all coated with iron oxide red anti-rust paint, and the surface of the iron oxide red anti-rust paint is coated with medium gray paint.

[0025] By adopting the above technical solution, a double-layer paint film covers the surface of each component, which can reduce the corrosive effect of the external environment on the steel structure components and slow down the occurrence of rust on the component surface.

[0026] In summary, the present invention has the following main beneficial effects:

[0027] 1. The present invention, through the setting of the furnace support column body, the first reinforcing steel plate, the second reinforcing steel plate and the third reinforcing steel plate, the furnace support column body is made of 16mm thick H-shaped steel, and the first reinforcing steel plate, the second reinforcing steel plate and the third reinforcing steel plate are arranged in sections, which helps to improve the overall structural rigidity of the furnace support column and reduce the situation of inconsistent vertical deformation of the furnace support column under the action of furnace body expansion load;

[0028] 2. The present invention, through the setting of supporting steel pipe and reinforcing steel plate, the supporting steel pipe is embedded in the opening position of the furnace protection column body, and the horizontal tie bar can be inserted inside the supporting steel pipe, increasing the contact support area of ​​the horizontal tie bar, dispersing the shear load borne by the horizontal tie bar, and the reinforcing steel plate forms local reinforcement for the opening area of ​​the furnace protection column body, reducing the probability of structural damage at the opening position.

[0029] 3. The present invention, through the arrangement of the first through hole, the second through hole, and the reinforcing ribs, allows the first and second through holes to connect the chamber with the outside, which helps to expel the heated air inside the chamber, reduces the pressure buildup inside the chamber, and at the same time can form air convection between the inside and outside of the chamber, alleviating the heat accumulation inside the chamber; the staggered distribution of the first and second through holes can change the airflow direction inside the chamber and improve the gas flow effect; the grid-like reinforcing ribs are arranged corresponding to the hollow positions of the through holes, which reduces stress concentration in the opening area of ​​the through holes without obstructing the gas flow, and reduces the possibility of deformation and cracking at the opening. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of an existing calcining furnace;

[0031] Figure 2 A schematic diagram of the structure of the furnace support column for the calcining furnace;

[0032] Figure 3 A schematic diagram of the rear structure of the furnace support column of the calcining furnace;

[0033] Figure 4 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the image;

[0035] Figure 6 This is a cross-sectional structural diagram of the present invention;

[0036] Figure 7 For the present invention Figure 6 Enlarged view of the structure at point B in the image;

[0037] Figure 8 This is a schematic diagram of the explosive structure of the supporting steel pipe of the present invention;

[0038] Figure 9 This is a schematic diagram of the second reinforced steel plate explosion structure of the present invention.

[0039] In the diagram: 1. Main body of furnace support column; 2. Supporting angle steel; 3. Bending-resistant steel plate; 4. Supporting steel pipe; 5. Reinforcing steel plate; 6. First reinforcing steel plate; 7. Second reinforcing steel plate; 8. Third reinforcing steel plate; 9. First through hole; 10. Second through hole; 11. Reinforcing rib. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] The embodiments of the present invention will now be described.

[0042] Example 1:

[0043] A furnace support column structure for a calcining furnace, such as Figures 4-9As shown, the structure includes a furnace support column body 1, which is an H-shaped steel column with dimensions of 8610mm*300mm*230mm*16mm (length, width, height, and wall thickness), providing high structural bending resistance. Supporting angle steel 2 is welded to the outer surface of the furnace support column body 1, and bending-resistant steel plates 3 are welded to both sides of the supporting angle steel 2. The bending-resistant steel plates 3 are welded and fixed to the furnace support column body 1, serving as lateral reinforcement for the supporting angle steel 2. Supporting steel pipes 4 are installed above and below the outer surface of the furnace support column body 1. The diameter, wall thickness, and length of the supporting steel pipes 4 are ∅76mm*6mm*320mm, allowing for the installation of cross bracing to transfer loads. Reinforcing steel plates 5 are welded to the outer ring of both supporting steel pipes 4. The reinforcing steel plate 5 is welded and fixed to the furnace support column body 1. The length, width and wall thickness of the reinforcing steel plate 5 are 180mm*180mm*10mm. The reinforcing steel plate 5 provides local reinforcement at the opening position of the furnace support column body 1. The first reinforcing steel plate 6 and the second reinforcing steel plate 7 are welded to both sides of the furnace support column body 1. The length, width and wall thickness of the first reinforcing steel plate 6 and the second reinforcing steel plate 7 are 107mm*268mm*10mm. The first reinforcing steel plate 6, the second reinforcing steel plate 7 and the furnace support column body 1 are welded together with a third reinforcing steel plate 8. The length, width and wall thickness of the third reinforcing steel plate 8 are 180mm*268mm*10mm. The first reinforcing steel plate 6, the second reinforcing steel plate 7 and the third reinforcing steel plate 8 cooperate to form a segmented reinforcement structure.

[0044] See Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 9 In the above embodiment, reinforcing ribs 11 are welded to the bottom of the first reinforcing steel plate 6 and the top of the second reinforcing steel plate 7. The reinforcing ribs 11 are grid-shaped, with a length, width, and wall thickness of 97mm*268mm*5mm. The reinforcing ribs 11 are welded and fixed to the furnace support column body 1. The reinforcing ribs 11 are used to reinforce the rigidity of the through-hole opening area. Multiple first reinforcing steel plates 6, second reinforcing steel plates 7, third reinforcing steel plates 8, and reinforcing ribs 11 are provided. Multiple first reinforcing steel plates 6, second reinforcing steel plates 7, and third reinforcing steel plates 8 are equidistantly distributed to achieve the dispersion of lateral loads along the height direction of the furnace support column body 1. The first reinforcing steel plate 6 has multiple first through holes 9 at its top, and the second reinforcing steel plate 7 has multiple second through holes 10 at its bottom. Each set of the first through holes 9 and the second through holes 10 consists of four to eight holes. The diameter of the first through holes 9 and the second through holes 10 is 2mm to 10mm. The first through holes 9 and the second through holes 10 are used to connect the chamber with the outside gas. The first through holes 9 and the second through holes 10 are staggered to change the airflow path in the chamber and expand the gas flow range. The positions of the first through holes 9 and the second through holes 10 correspond to the hollowed-out parts of the grid-like reinforcing ribs 11 to ensure that the gas flow channel is not blocked by the reinforcing ribs 11.

[0045] Example 2:

[0046] Based on the above embodiment one, in order to meet the overall structural mechanics requirements, the following settings are now implemented.

[0047] See Figures 4-9 In the above embodiments, the main body 1 of the furnace support column, the supporting angle steel 2, the bending steel plate 3, the supporting steel pipe 4, the reinforcing steel plate 5, the first reinforcing steel plate 6, the second reinforcing steel plate 7, the third reinforcing steel plate 8 and the reinforcing rib 11 are all made of Q235 material, which has good comprehensive mechanical properties.

[0048] Example 3:

[0049] Based on the above embodiment one, in order to reduce the impact of environmental media erosion on the components, the following settings are now adopted.

[0050] See Figures 4-9 In the above embodiments, the surfaces of the furnace support column body 1, supporting angle steel 2, bending steel plate 3, supporting steel pipe 4, reinforcing steel plate 5, first reinforcing steel plate 6, second reinforcing steel plate 7, third reinforcing steel plate 8 and reinforcing rib 11 are all coated with iron oxide red anti-rust paint, and the surface of the iron oxide red anti-rust paint is coated with medium gray paint. The double-layer paint film can slow down the occurrence of corrosion of steel structure components.

[0051] The implementation principle of this invention is as follows: First, the main body 1 of the furnace support column is made of H-shaped steel with a wall thickness of 16mm. Supporting angle steel 2 is welded to the outside of the main body 1 of the furnace support column, and anti-bending steel plates 3 are welded to both sides of the supporting angle steel 2. The anti-bending steel plates 3 are also welded to the main body 1 of the furnace support column. The anti-bending steel plates 3 provide lateral reinforcement to the supporting angle steel 2, reducing the probability of bending deformation of the supporting angle steel 2 under load. Through holes are opened at the upper and lower positions of the main body 1 of the furnace support column. Supporting steel pipes 4 are inserted into the corresponding through holes and welded. Then, reinforcing steel plates 5 are welded to the outer surface of the corresponding openings of the main body 1 of the furnace support column. The reinforcing steel plates 5 cover the area around the openings, providing local reinforcement to the plate at the opening position of the main body 1 of the furnace support column. During the assembly of the horizontal tie rod, it is inserted into the interior of the supporting steel pipe 4. The contact part of the horizontal tie rod changes from contact with the thin steel plate to contact with the inner ring of the supporting steel pipe 4, increasing the contact bearing area and thus dispersing the shear load borne by the horizontal tie rod.

[0052] A number of first through holes 9 are opened on the top of the first reinforcing steel plate 6, and a number of second through holes 10 are opened on the bottom of the second reinforcing steel plate 7. The first through holes 9 and the second through holes 10 are staggered. The bottom of the first reinforcing steel plate 6 and the top of the second reinforcing steel plate 7 are respectively welded with grid-shaped reinforcing ribs 11. The hollow position of the grid-shaped reinforcing ribs 11 corresponds to the position of the first through holes 9 and the second through holes 10, so as not to block the gas flow channel.

[0053] Along the height direction of the furnace support column body 1, multiple sets of first reinforcing steel plates 6, second reinforcing steel plates 7 and third reinforcing steel plates 8 are welded at equal intervals on both sides of the furnace support column body 1. Specifically, the first reinforcing steel plates 6 and second reinforcing steel plates 7 are fully welded first, and then the third reinforcing steel plates 8 are fully welded. The first reinforcing steel plates 6, second reinforcing steel plates 7, third reinforcing steel plates 8 and the furnace support column body 1 enclose a closed cavity. The segmented reinforcing steel plates work together to improve the overall structural rigidity of the furnace support column body 1 and reduce the inconsistent vertical deformation of the furnace support column caused by the furnace body expansion load.

[0054] After the equipment is put into furnace drying and normal production operation, the furnace body expands due to heat and transfers the lateral load to the furnace support column. The main body of the furnace support column 1 and the reinforcing steel plates of each section jointly bear the lateral force. The air inside the chamber is affected by the environment and its temperature rises. The hot air inside the chamber can be discharged outward through the first through hole 9 and the second through hole 10 in sequence, reducing the occurrence of pressure buildup inside the chamber. During heat dissipation, relying on the characteristic of hot air rising, the relatively cool air outside the chamber can be replenished into the chamber to form air convection, thereby alleviating the heat accumulation inside the chamber. The first through hole 9 and the second through hole 10 are staggered, and the airflow path into and out of the chamber is reversed, which helps to expand the gas flow range inside the chamber. The grid-like reinforcing ribs 11 reinforce the reinforcing steel plate area with through holes, disperse the stress around the through holes, and reduce the occurrence of deformation and cracking at the opening position.

[0055] All components of this structure can be manufactured using Q235 material, and J422 welding rods are used for overall welding to meet the strength requirements of the overall structure. Iron oxide red anti-rust paint and medium gray paint can be applied to the surface of all components in sequence to slow down the occurrence of rust on the surface of the components. The furnace support columns, together with the horizontal tie rods, form a lateral constraint on the furnace body of the pot furnace, which is suitable for the large thermal expansion conditions during the baking stage of large pot furnaces and maintains the working state of the steel structure frame.

[0056] Although embodiments of the present invention have been shown and described, these specific embodiments are merely illustrative of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A furnace protection column structure for a calcining furnace, comprising a furnace protection column body (1), characterized in that: The outer surface of the furnace support column body (1) is welded with supporting angle steel (2), and anti-bending steel plates (3) are welded to both sides of the supporting angle steel (2). The anti-bending steel plates (3) are welded and fixed to the furnace support column body (1). Supporting steel pipes (4) are installed above and below the outer surface of the furnace support column body (1). Reinforcing steel plates (5) are welded to the outer ring of the two supporting steel pipes (4). The reinforcing steel plates (5) are welded and fixed to the furnace support column body (1). First reinforcements are welded to both sides of the furnace support column body (1). A steel plate (6) and a second reinforcing steel plate (7) are provided. A third reinforcing steel plate (8) is welded between the first reinforcing steel plate (6), the second reinforcing steel plate (7) and the furnace support column body (1). A reinforcing rib (11) is welded to the bottom of the first reinforcing steel plate (6) and the top of the second reinforcing steel plate (7). The reinforcing rib (11) is welded and fixed to the furnace support column body (1). A plurality of first through holes (9) are opened at the top of the first reinforcing steel plate (6), and a plurality of second through holes (10) are opened at the bottom of the second reinforcing steel plate (7).

2. The furnace support column structure for a calcining furnace according to claim 1, characterized in that: Multiple first reinforcing steel plates (6), second reinforcing steel plates (7), third reinforcing steel plates (8) and reinforcing ribs (11) are provided, and multiple first reinforcing steel plates (6), second reinforcing steel plates (7) and third reinforcing steel plates (8) are distributed at equal intervals.

3. The furnace support column structure for a calcining furnace according to claim 1, characterized in that: The first through hole (9) and the second through hole (10) are provided in multiple groups, with four to eight in each group. The diameter of the first through hole (9) and the second through hole (10) is 2mm to 10mm. The first through hole (9) and the second through hole (10) are staggered.

4. The furnace support column structure for a calcining furnace according to claim 3, characterized in that: The reinforcing rib (11) is in the shape of a grid. The first through hole (9) and the second through hole (10) correspond to the hollowed-out part of the grid-shaped reinforcing rib (11). The length, width and wall thickness of the grid-shaped reinforcing rib (11) are 97mm*268mm*5mm.

5. The furnace support column structure for a calcining furnace according to claim 1, characterized in that: The main body (1) of the furnace protection column is an H-shaped steel, and the length, width, height and wall thickness of the main body (1) of the furnace protection column are 8610mm*300mm*230mm*16mm.

6. The furnace support column structure for a calcining furnace according to claim 1, characterized in that: The length, width, height and wall thickness of the supporting angle steel (2) are 180mm*100mm*100mm*10mm; the bending steel plate (3) is triangular and the length, width and wall thickness of the bending steel plate (3) are 100mm*100mm*10mm.

7. The furnace support column structure for a calcining furnace according to claim 1, characterized in that: The diameter, wall thickness and length of the supporting steel pipe (4) are ∅76mm*6mm*320mm, and the length, width and wall thickness of the reinforcing steel plate (5) are 180mm*180mm*10mm.

8. The furnace support column structure for a calcining furnace according to claim 2, characterized in that: The length, width and wall thickness of the first reinforcing steel plate (6) and the second reinforcing steel plate (7) are 107mm*268mm*10mm, and the length, width and wall thickness of the third reinforcing steel plate (8) are 180mm*268mm*10mm.

9. The furnace support column structure for a calcining furnace according to claim 1, characterized in that: The main body (1), supporting angle steel (2), anti-bending steel plate (3), supporting steel pipe (4), reinforcing steel plate (5), first reinforcing steel plate (6), second reinforcing steel plate (7), third reinforcing steel plate (8) and reinforcing rib (11) of the furnace support column are all made of Q235 material.

10. The furnace support column structure for a calcining furnace according to claim 9, characterized in that: The main body (1), supporting angle steel (2), anti-bending steel plate (3), supporting steel pipe (4), reinforcing steel plate (5), first reinforcing steel plate (6), second reinforcing steel plate (7), third reinforcing steel plate (8) and reinforcing rib (11) of the furnace support column are all coated with iron red anti-rust paint, and the surface of the iron red anti-rust paint is coated with medium gray paint.

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