Hot blast stove shell, hot blast stove and heat treatment method

Abstract

The invention discloses a hot blast stove shell which comprises a shell body and a cover plate, the shell body comprises a body and a cover plate, the body is provided with a brick inlet hole, the brick inlet hole is located in a vault area of a hot blast stove, and the cover plate is connected with the body to cover the brick inlet hole; the reinforcing assembly comprises multiple first reinforcing plates and multiple second reinforcing plates, the multiple first reinforcing plates and the multiple second reinforcing plates are arranged, and the multiple first reinforcing plates are sequentially arranged on the shell in a winding mode at intervals and located in the arch crown area; the first reinforcing plates and the second reinforcing plates are distributed in a staggered mode.

Description

Technical Field

[0001] This application belongs to the technical field of hot blast stove shell manufacturing, and specifically relates to a hot blast stove shell, a hot blast stove, and a heat treatment method. Background Art

[0002] When newly building a blast furnace hot blast stove, due to the large amount of refractory brick laying work inside the hot blast stove, how to ensure the transportation of refractory materials into the hot blast stove is a difficult point in engineering construction. Therefore, it is necessary to reserve an inspection brick inlet hole at the top of the hot blast stove to create conditions for laying refractory bricks in the hot blast stove. At the same time, in order to eliminate the welding residual stress of the hot blast stove, it is necessary to perform heat treatment on the variable diameter high-temperature area of the hot blast stove arch top. Due to the setting of the inspection brick inlet hole, the stress distribution of the hot blast stove shell is changed, and the shell plate at the reserved inspection brick inlet hole is prone to deformation during the heat treatment of the arch top shell, resulting in stress concentration. Once the shell is deformed, cracks and air leakage are extremely likely to occur at the stress concentration position during hot air supply. Summary of the Invention

[0003] To solve the technical problem of deformation during the new construction of the current hot blast stove shell, this application provides a hot blast stove shell and a heat treatment method.

[0004] In the first aspect of this application, a hot blast stove shell is provided, including:

[0005] A shell, including a main body and a cover plate. The main body is provided with a brick inlet hole, the brick inlet hole is located in the arch top area of the hot blast stove, and the cover plate is connected to the main body to cover the brick inlet hole;

[0006] A reinforcement assembly, including a first reinforcement plate and a second reinforcement plate. There are multiple first reinforcement plates and multiple second reinforcement plates. The multiple first reinforcement plates are sequentially arranged at intervals around the shell and are located in the arch top area; the first reinforcement plates and the second reinforcement plates are staggered.

[0007] In some embodiments, both ends of the second reinforcement plate are welded to adjacent first reinforcement plates.

[0008] In some embodiments, along the circumferential direction of the arch top area, the length of the second reinforcement plate is 250 mm to 350 mm.

[0009] In some embodiments, both the first reinforcement plate and the second reinforcement plate include a vertical plate and a horizontal plate connected to each other, and the horizontal plate is welded to the main body.

[0010] In some embodiments, along the circumferential direction of the arch top area, the length of the first reinforcement plate is greater than the length of the brick inlet hole.

[0011] In some embodiments, along the circumferential direction of the arch top area, the difference between the length of the first reinforcement plate and the length of the brick inlet hole is 0.8 to 1.3 m.

[0012] In some embodiments, along the circumferential direction of the vault area, the length of the first reinforcing plate is 2.5 m to 3.5 m.

[0013] In some embodiments, among the multiple first reinforcing plates, along the circumferential direction of the vault area, one of the first reinforcing plates covers the cover plate.

[0014] In the second aspect of the present application, there is provided a hot blast stove, including the hot blast stove shell of the first aspect.

[0015] In the second aspect of the present application, there is provided a heat treatment method for a hot blast stove shell, including the following steps:

[0016] Obtain the main body;

[0017] Weld the first reinforcing plates to the vault area of the main body, so that the multiple first reinforcing plates are sequentially arranged at intervals around the main body;

[0018] Perform a first heat treatment on the main body and the first reinforcing plates;

[0019] Feed bricks through the brick inlet hole of the main body, and weld the cover plate to the edge of the brick inlet hole;

[0020] Perform a local second heat treatment on the weld between the cover plate and the hole edge, and after completion, weld the second reinforcing plate to the first reinforcing plate.

[0021] The hot blast stove shell provided according to the embodiments of the present application includes a shell and a reinforcement assembly. The shell includes a main body and a cover plate. The main body is provided with a brick inlet hole, and the brick inlet hole is located in the vault area of the hot blast stove. The cover plate is connected to the main body to cover the brick inlet hole; the reinforcement assembly includes a first reinforcing plate and a second reinforcing plate. There are multiple first reinforcing plates and multiple second reinforcing plates. The multiple first reinforcing plates are sequentially arranged at intervals around the shell and are located in the vault area; the first reinforcing plates and the second reinforcing plates are staggered.

[0022] Since the first reinforcing plates are arranged at intervals around the shell, in a newly built hot blast stove, the whole formed by welding the main body and the first reinforcing plates can be annealed first to remove the weld stress. Since the first reinforcing plates are distributed at intervals, during the heating process, the first reinforcing plates can expand synchronously with the main body, eliminating the problem of shell deformation caused by the asynchronous heating expansion of the integral reinforcing ring and the shell; during the annealing heat treatment process, the welding stress can also be released in the intervals between two adjacent first reinforcing plates, reducing the deformation amount and stress concentration of the furnace shell and reducing the cracking risk during the operation of the hot blast stove. Description of the Drawings

[0023] Figure 1Shows a schematic structural diagram of the hot blast stove shell in one or more embodiments of the present application.

[0024] Figure 2 Shows Figure 1 D - D view of

[0025] Figure 3 Shows Figure 2 Partial enlarged view at A of

[0026] Figure 4 Shows Figure 2 E - E sectional view of

[0027] Figure 5 Shows a schematic structural diagram of the hot blast stove shell during the first heat treatment process.

[0028] Figure 6 Shows Figure 5 B - B view of

[0029] Figure 7 Shows a schematic structural diagram of the hot blast stove shell during the brick - feeding process.

[0030] Figure 8 Shows Figure 7 C - C view of

[0031] Explanation of reference numerals:

[0032] 100 - housing, 110 - body, 111 - brick - feeding hole, 120 - cover plate;

[0033] 200 - reinforcement assembly, 210a - first reinforcement plate, 210b - second reinforcement plate, 211 - cross - plate, 212 - vertical plate, 240 - gap. Detailed implementation manners

[0034] In order to enable those skilled in the art in the technical field to which the present application belongs to more clearly understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0035] In the related art, an integral reinforcement ring is arranged outside the hot blast stove shell and is located in the arch top area. Calculate the thermal expansion increase values of the integral reinforcement ring and the circumference of the stove shell during the heat treatment of the hot blast stove shell:

[0036] Based on the inner diameter of 10.60 meters at the brick inlet of the hot blast stove body, the heat treatment temperature is 600°C ± 20°C, with an average value of 600°C, and the integral reinforcement ring is 200°C lower than the furnace shell temperature for calculation.

[0037] The furnace shell can be made of steel plate, carbon steel, and low-carbon alloy steel. The average linear expansion coefficient between the following temperatures and 20°C: <![CDATA[Coefficient of linear thermal expansion a (10 -6 / °C)]]> 20℃～100℃ 11.53 20℃～200℃ 12.25 20℃～300℃ 12.90 20℃～400℃ 13.58 20℃～500℃ 14.22 20℃～600℃ 14.62

[0038] Calculate the circumferential deformation of the furnace shell during the heat treatment process at the brick inlet of the hot blast stove:

[0039] ΔL = a × L0 × (T2 - T1)

[0040] (1) When the temperature of the shell at the brick inlet rises from 20°C to 600°C, the circumferential deformation of the shell is:

[0041] ΔL = 14.62×10-6 × 10.6 × 3.14 × (600 - 20) = 0.282 meters = 282 mm

[0042] (2) When the integral reinforcement ring rises from 20°C to 600°C, the circumferential deformation is: ΔL = 13.58×10-6 × 10.6 × 3.14 × (400 - 20) = 0.172 meters = 172 mm

[0043] The circumferential deformation of the shell at the brick inlet is larger than that of the integral reinforcement ring by: 282 - 172 = 110 mm

[0044] Since the circumferential deformation of the shell at this part is 110 mm larger than that of the integral reinforcement ring, the shell is restricted by the integral reinforcement ring, resulting in deformation of the shell at the brick inlet.

[0045] In the first aspect of the embodiments of the present application, a hot blast stove furnace shell is provided, which has no stress concentration, is not prone to cracking, and has a long service life.

[0046] Please refer to Temperature range and Figure 1, the shell of the hot blast stove of the present application includes a shell 100 and a reinforcement assembly 200. The shell 100 is the outer shell of the hot blast stove. Generally speaking, the shell 100 is formed by welding multiple steel plates. The shell 100 includes a main body 110 and a cover plate 120. The main body 110 is the structure formed before the last steel plate, that is, the cover plate 120, is welded. The main body 110 is provided with a brick inlet hole 111. The setting of the brick inlet hole 111 facilitates the operator to send refractory bricks into the shell 100 to build the hot blast stove. The brick inlet hole 111 is actually a hole formed when the cover plate 120 has not been welded yet. Generally speaking, the hot blast stove is provided with a dome, a combustion chamber, a regenerator, etc. The dome of the hot blast stove is the top structure of the hot blast stove, which is mainly used to withstand the high-temperature flue gas pressure generated by combustion and evenly transfer heat to the regenerator. The brick inlet hole 111 is located in the dome area of the hot blast stove, and the cover plate 120 is connected to the main body 110 to cover the brick inlet hole 111; the reinforcement assembly 200 includes a first reinforcement plate 210a and a second reinforcement plate 210b. There are multiple first reinforcement plates 210a and multiple second reinforcement plates 210b. The multiple first reinforcement plates 210a are sequentially arranged around the shell 100 at intervals and are located in the dome area; along the circumferential direction of the dome area, the first reinforcement plates 210a and the second reinforcement plates 210b are alternately distributed in sequence.

[0047] Since the first reinforcement plates 210a are arranged around the shell 100 at intervals, in a newly built hot blast stove, the whole formed by welding the main body 110 and the first reinforcement plates 210a can be first subjected to a first heat treatment to remove the weld stress. The first heat treatment (annealing heat treatment) is generally achieved by heating inside the shell 100. The heating rate of the main body 110 is fast and the temperature is high. The first reinforcement plates 210a are located outside the main body 110 and are easy to exchange heat with the outside world. Therefore, the heating rate is fast and the temperature is low. Since there is a gap 240 between two adjacent first reinforcement plates 210a, the first reinforcement plates 210a cannot "clamp" the main body 110. The first reinforcement plates 210a and the main body 110 expand synchronously, eliminating the problem of deformation of the shell 100 caused by the asynchronous heating expansion of the integral reinforcement ring and the shell 100; during the annealing heat treatment process, the welding stress can also be released in the interval between two adjacent first reinforcement plates 210a, reducing the deformation amount and stress concentration of the furnace shell and reducing the cracking risk during the operation of the hot blast stove. After the annealing heat treatment is completed, bricks are sent into the shell 100 through the brick inlet hole 111. After masonry, only the part of the brick inlet hole 111 is not masonry. Then, the second reinforcement plates 210b are welded between two adjacent second reinforcement plates 210b, the cover plate 120 is welded to the hole edge of the brick inlet hole 111, and then a local second heat treatment is carried out. In this way, the construction of the hot blast stove is realized, the stress concentration of the shell 100 is reduced, and the service life of the hot blast stove is improved.

[0048] For the housing 100, rectangular steel plates are generally used for butt welding. Therefore, the brick inlet hole 111 can be rectangular. Of course, the housing 100 can also be formed by butt welding steel plates of other shapes, such as circular, but this may increase the operation difficulty. The circumferential length of the brick inlet hole 111 along the vault area can be 1.8 m to 2.3 m, such as 1.9 m, 2.0 m, 2.1 m, or 2.2 m, etc. The length of the brick inlet hole 111 in the height direction is the height of the straight section furnace shell plate of the hot blast stove vault. The cutting part of the brick inlet hole 111 avoids the welds of the original furnace shell plate. In principle, the welds of the furnace shell plate that have been welded cannot be cut and welded again due to the addition of reserved maintenance holes.

[0049] As the vault reinforcement structure of the housing 100, the reinforcement assembly 200 can improve the strength of the housing 100. Since the vault of the hot blast stove is cylindrical or quasi-cylindrical, the first reinforcement plate 210a and the second reinforcement plate 210b can be arc-shaped plates to match the shape of the vault area. Of course, the first reinforcement plate 210a and the second reinforcement plate 210b can also be flat plates, which is not limited in this application.

[0050] If one first reinforcement plate 210a is provided and is arranged around the body 110, then during the first heat treatment process, the temperature of the body 110 rises, and the circumferential length of the body 110 becomes longer. The heating rate and temperature of the first reinforcement plate 210a are both lower than those of the body 110, which will cause the increase in the circumferential length of the first reinforcement plate 210a along the vault area to be less than the increase in the circumferential length of the body 110. If the first reinforcement plate 210a is integrally installed at this part, all the expansion stresses of the body 110 will be concentrated at the brick inlet hole 111 part. Since the body 110 at this part is not fully welded, it will cause deformation at this place.

[0051] The first reinforcement plates 210a are evenly spaced around the central axis of the housing 100. The interval between two adjacent first reinforcement plates 210a can be 250 mm to 350 mm, such as 255 mm, 260 mm, 265 mm, 270 mm, 275 mm, 280 mm, 285 mm, 290 mm, 295 mm, 300 mm, 305 mm, 310 mm, 315 mm, 320 mm, 325 mm, 330 mm, 335 mm, 340 mm, or 345 mm, etc. The length of this interval can be reasonably determined according to the circumferential expansion amount of the body 110 during the annealing heat treatment and the weld stress. If the length of the first reinforcement plate 210a is too long and the interval is too small, it may increase the welding stress released to the position of the brick inlet hole 111 to a certain extent, with a high degree of deformation, and will also limit the circumferential expansion of the body 110, resulting in stress concentration. In some other embodiments, the length of the first reinforcement plate 210a can also be less than 250 mm, and the circumferential free expansion of the body 110 can still be achieved, and the welding stress can be released.

[0052] In some embodiments, along the circumferential direction of the vault area, the length of the first reinforcing plate 210a is greater than the length of the brick inlet hole 111, so that during the first heat treatment process, the first reinforcing plate 210a can reduce the deformation amount and stress concentration at the edge of the brick inlet hole 111.

[0053] In certain embodiments, along the circumferential direction of the vault area, the difference between the length of the first reinforcing plate 210a and the length of the brick inlet hole 111 can be 0.8 - 1.3 m, such as 0.9 m, 1.0 m, 1.1 m or 1.2 m, etc., which is convenient for realizing the connection between the first reinforcing plate 210a and the body 110. Of course, the difference between the length of the first reinforcing plate 210a along the axial direction of the vault area and the length of the brick inlet hole 111 along the circumferential direction of the vault area can also be greater than 1.3 m, and this application does not make any restrictions.

[0054] In certain embodiments, along the circumferential direction of the vault area, the length of the first reinforcing plate 210a can be 2.5 m - 3.5 m, such as 2.6 m, 2.7 m, 2.8 m, 2.9 m, 3.0 m, 3.1 m, 3.2 m, 3.3 m or 3.4 m, etc. Of course, the length of the first reinforcing plate 210a can also be greater than 3.5 m, or less than 2.5 m, and this application does not make any restrictions.

[0055] In certain embodiments, among the multiple first reinforcing plates 210a, along the circumferential direction of the vault area, one of the first reinforcing plates 210a covers the cover plate 120 to reduce the deformation amount and stress concentration at the edge of the brick inlet hole 111 during the first heat treatment process.

[0056] In some embodiments, among the multiple first reinforcing plates 210a, along the circumferential direction of the vault area, both ends of one of the first reinforcing plates 210a extend out of the cover plate 120, which is not only convenient for realizing the connection between the first reinforcing plate 210a and the body 110, but also can reduce the deformation amount and stress concentration at the edge of the brick inlet hole 111 during the first heat treatment process. In other embodiments, along the circumferential direction of the vault area, the first reinforcing plate 210a and the cover plate 120 have the same size, which can also reduce the deformation amount and stress concentration at the edge of the brick inlet hole 111 during the first heat treatment process.

[0057] The multiple first reinforcing plates 210a are divided into hole reinforcing plates and non - hole reinforcing plates. The hole reinforcing plates are the reinforcing plates covering the cover plate 120, and the remaining reinforcing plates are non - hole reinforcing plates. Along the circumferential direction of the vault area, the length of the hole reinforcing plates is greater than the length of the non - hole reinforcing plates; or, along the circumferential direction of the vault area, the length of the hole reinforcing plates is equal to or less than the length of the non - hole reinforcing plates, which can all reduce the deformation amount and stress concentration at the edge of the brick inlet hole 111 during the first heat treatment process, as well as the circumferential free expansion of the body 110.

[0058] To reduce the connection weld between the first reinforcing plate 210a and the body 110 and reduce stress concentration, in some embodiments, please refer toFigure 2 and Figure 3 , the first reinforcing plate 210a includes a vertical plate 212 and a horizontal plate 211. The vertical plate 212 and the horizontal plate 211 are connected. The plane of the vertical plate 212 is parallel to the central axis of the housing 100. The horizontal plate 211 is horizontally arranged, and its plane is perpendicular to the central axis of the housing 100. The horizontal plate 211 is connected to the outside of the body 110. That is to say, the vertical plate 212 is welded to the body 110 through the horizontal plate 211, that is, both sides of the horizontal plate 211 along the radial direction of the crown area are welded to the body 110 and the vertical plate 212 respectively. If the plane of the vertical plate 212 is directly welded to the body 110, there will be welds on both the upper and lower sides, the length of the welds is very long, the welding stress is large, and it is not conducive to the free circumferential expansion of the body 110 during the first heat treatment process. Due to the setting of the horizontal plate 211 and the horizontal plate 211 being horizontally arranged, the setting of the vertical plate 212 and the horizontal plate 211 makes the weld between the horizontal plate 211 and the body 110 a line along the circumferential direction of the crown area. The weld is short, the welding stress is small, and the hindrance to the circumferential expansion of the body 110 during the first heat treatment process is small.

[0059] The second reinforcing plate 210b is a structure installed after the end of the first heat treatment. In some embodiments, both ends of the second reinforcing plate 210b are welded to the adjacent first reinforcing plate 210a. The second reinforcing plate 210b is not directly welded to the body 110, but is welded to the first reinforcing plate 210a, so there is no need to perform heat treatment to release the welding stress, and it will not affect the body 110.

[0060] The second reinforcing plate 210b can also be the same as the first reinforcing plate 210a, including a horizontal plate 211 and a vertical plate 212. The vertical plate 212 and the horizontal plate 211 are connected. The plane of the vertical plate 212 is parallel to the central axis of the housing 100. The horizontal plate 211 is horizontally arranged, and its plane is perpendicular to the central axis of the housing 100. The horizontal plate 211 is connected to the outside of the body 110. The horizontal plate 211 of the second reinforcing plate 210b is welded to the horizontal plate 211 of the first reinforcing plate 210a, and the vertical plate 212 of the second reinforcing plate 210b is welded to the vertical plate 212 of the first reinforcing plate 210a.

[0061] In some embodiments, along the circumferential direction of the crown area, the length of the second reinforcing plate 210b can be 250 mm to 350 mm, such as 255 mm, 260 mm, 265 mm, 270 mm, 275 mm, 280 mm, 285 mm, 290 mm, 295 mm, 300 mm, 305 mm, 310 mm, 315 mm, 320 mm, 325 mm, 330 mm, 335 mm, 340 mm or 345 mm, etc.

[0062] Based on the same technical concept as the first aspect, an embodiment of the second aspect of the present application provides a hot blast stove, including the hot blast stove shell of any implementation manner of the first aspect.

[0063] Based on the same technical concept as the first aspect, an embodiment of the second aspect of the present application provides a heat treatment method for the hot blast stove shell. This aspect can not only realize the construction of the heating furnace shell but also reduce the stress concentration of the shell and reduce the cracking risk during the working process.

[0064] The heat treatment method for the hot blast stove shell provided by the embodiment of the present application includes the following steps:

[0065] S1. Obtain the main body 110;

[0066] S2. Weld the first reinforcing plate 210a to the crown area of the main body 110, so that a plurality of first reinforcing plates 210a are sequentially arranged at intervals around the main body 110;

[0067] S3. Perform a first heat treatment on the main body 110 and the first reinforcing plate 210a (see Figure 4 and Figure 5 );

[0068] S4. Feed bricks through the brick inlet hole 111 of the main body 110 (see Figure 6 and Figure 7 Figure 8 ), and weld the cover plate 120 to the edge of the brick inlet hole 111;

[0069] S5. Perform a local second heat treatment on the weld between the cover plate 120 and the hole edge. After completion, weld the second reinforcing plate 210b to the first reinforcing plate 210a.

[0070] In step S1, the main body 110 can be formed by welding a plurality of steel plates, leaving a brick inlet hole 111. If the brick inlet hole 111 is cut after all welding, it will cause secondary welding of the weld of the main body 110 after cutting, affecting the life of the shell 100.

[0071] In step S2, welding the first reinforcing plate 210a to the crown area of the main body 110 can be achieved by first connecting the horizontal plate 211 and the vertical plate 212, and then welding the horizontal plate 211 to the main body 110. The first reinforcing plates 210a are distributed at intervals, and the intervals therein can release stress during the first heat treatment stage, reduce the stress concentration of the main body 110, and can also serve as the welding space for the second reinforcing plate 210b. It should be noted that one of the first reinforcing plates 210a covers the brick inlet hole 111 and extends beyond the brick inlet hole 111 at both ends along the crown circumference.

[0072] In step S3, there is welding stress in the connection welds between the body 110 and the first reinforcing plate 210a. The welding stress can be released through the first heat treatment, reducing stress concentration, thereby reducing the risk of cracking of the furnace shell during operation. A gap is left between two adjacent first reinforcing plates 210a to eliminate the problem of stress concentration and deformation at the brick inlet hole 111 caused by the asynchronous temperature rise of the overall reinforcing plate and the body 110, resulting in a smaller perimeter expansion of the overall reinforcing plate than that of the body 110. The heat treatment can heat-treat the body 110 by burning inside the furnace shell through a combustion device. In this step, the cover plate 120 can also be covered at the brick inlet hole, but not welded, so as to reduce heat loss.

[0073] In step S5, local second heat treatment of the weld between the cover plate 120 and the hole edge can release the welding stress of the weld between the cover plate 120 and the hole edge, reduce stress concentration, thereby reducing the risk of cracking of the furnace shell during operation.

[0074] The following details the construction process of the hot blast stove:

[0075] (1) First, weld the steel plates to form the body 110 of the furnace shell, form the brick inlet hole 111, and spot-weld the cover plate 120 to connect with the hole edge of the brick inlet hole 111.

[0076] (2) Weld the first reinforcing plates 210a to the crown area of the body 110 in sequence. A plurality of first reinforcing plates 210a are spaced apart outside the body 110. One of the first reinforcing plates 210a covers the cover plate 120 and extends out of the cover plate 120 at both ends along the circumferential direction of the crown area for connection.

[0077] (3) Heat inside the body 110 to perform heat treatment on the furnace shell.

[0078] (4) After the heat treatment is completed, protectively remove the first reinforcing plate 210a covering the cover plate 120 and the cover plate 120. The brick inlet hole 111 is exposed. Send the refractory bricks into the housing 100 through the brick inlet hole 111, and then build the refractory layer of the hot blast stove, leaving the brick inlet hole 111 unbuilt.

[0079] (5) Weld the cover plate 120 to the hole edge of the brick inlet hole 111. Connect the removed first reinforcing plate 210a to the housing 100 and cover the cover plate 120, and then perform local heat treatment on the brick inlet hole 111.

[0080] (6) Build the refractory layer near the brick inlet hole 111, and weld the second reinforcing plate 210b to the adjacent first reinforcing plate 210a.

[0081] When a new blast furnace hot blast stove is built, due to the large amount of refractory brick masonry work inside the hot blast stove, the furnace shell of the blast furnace hot blast stove provided by the present invention has a brick inlet hole 111 reserved for process maintenance and brick feeding, creating conditions for the refractory brick masonry of the hot blast stove. In order to eliminate the welding residual stress of the hot blast stove, heat treatment needs to be carried out on the variable diameter high-temperature area of the hot blast stove arch top. Due to the setting of the brick inlet hole 111, the stress distribution of the hot blast stove furnace shell is changed, and the furnace shell plate at the brick inlet hole 111 is prone to deformation during the heat treatment of the hot blast stove arch top furnace shell. The hot blast stove furnace shell is segmented and reinforced by the first reinforcement plate 210a, and the installation position of the second reinforcement plate 210b is reserved, so that the stress can be evenly released during the heat treatment process, reducing the risk of stress concentration. After the bricklaying is completed, local heat treatment is carried out on the weld between the hole edge of the brick inlet hole 111 and the cover plate 120.

[0082] After the first heat treatment, the cover plate 120 and the corresponding first reinforcement plate 210a are removed protectively, and the hot blast stove arch top is fed with bricks for masonry. After the masonry inside the hot blast stove is basically completed, the cover plate 120 is reinstalled. The first reinforcement plate 210a is welded to the adjacent second reinforcement plate 210b and also to the body 110. After the installation of the first reinforcement plate 210a at the brick inlet hole 111 is completed, local heat treatment is carried out. After the heat treatment of the body 110 near the brick inlet hole 111 is completed, the second reinforcement plate 210b is installed. The second reinforcement plate 210b is only welded to the adjacent first reinforcement plate 210a and is not welded to the body 110 to prevent the generation of welding stress.

[0083] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is less than that of the second feature.

[0084] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0085] In this application, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] In addition, in this application, descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0087] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A hot blast stove casing, characterized in that, Comprising: A housing, including a main body and a cover plate. The main body is provided with a brick inlet hole, and the brick inlet hole is located in the arch top area of the hot blast stove. The cover plate is connected to the main body to cover the brick inlet hole; A reinforcement assembly, including a first reinforcement plate and a second reinforcement plate. There are multiple first reinforcement plates and multiple second reinforcement plates. The multiple first reinforcement plates are sequentially arranged at intervals around the housing and are located in the arch top area; the first reinforcement plates and the second reinforcement plates are staggered.

2. The hot blast stove casing according to claim 1, characterized in that, Both ends of the second reinforcement plate are welded to the adjacent first reinforcement plate.

3. The hot blast stove casing according to claim 2, characterized in that, Along the circumferential direction of the arch top area, the length of the second reinforcement plate is 250 mm to 350 mm.

4. The hot blast stove casing according to any one of claims 1-3, characterized in that, Both the first reinforcement plate and the second reinforcement plate include a vertical plate and a horizontal plate connected to each other, and the horizontal plate is welded to the main body.

5. The hot blast stove casing according to any one of claims 1-3, characterized in that, Along the circumferential direction of the arch top area, the length of the first reinforcement plate is greater than the length of the brick inlet hole.

6. The hot blast stove casing according to claim 5, wherein Along the circumferential direction of the arch top area, the difference between the length of the first reinforcement plate and the length of the brick inlet hole is 0.8 to 1.3 m.

7. The hot blast stove casing according to claim 5, wherein Along the circumferential direction of the arch top area, the length of the first reinforcement plate is 2.5 m to 3.5 m.

8. The hot blast stove casing according to any one of claims 1-3, characterized in that, Among the multiple first reinforcement plates, along the circumferential direction of the arch top area, one of the first reinforcement plates covers the cover plate.

9. A hot blast stove, characterized in that, Including the hot blast stove housing according to any one of claims 1-8.

10. A heat treatment method for the furnace shell of a hot blast stove, characterized in that, Including the following steps: Obtain the main body; Weld the first reinforcement plate to the arch top area of the main body so that the multiple first reinforcement plates are sequentially arranged at intervals around the main body; Perform a first heat treatment on the main body and the first reinforcement plate; Feed bricks through the brick inlet hole of the main body, and weld the cover plate to the hole edge of the brick inlet hole; Perform a local second heat treatment on the weld between the cover plate and the hole edge, and after completion, weld the second reinforcement plate to the first reinforcement plate.

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