Industrial furnace wall I-shaped expansion joint structure

Abstract

The present application relates to the technical field of industrial furnace wall, in particular to a kind of industrial furnace wall I-shaped expansion joint structure.Furnace wall is built by standard refractory brick, first special-shaped brick, second special-shaped brick and mother brick, and I-shaped expansion joint extending along height direction is periodically arranged along length direction of furnace wall with same preset interval.Odd layer includes first row brick and second row brick arranged side by side along thickness direction, first row brick is transversely arranged standard brick, and second row brick is longitudinally arranged standard brick;Even layer includes first row brick and second row brick arranged side by side along thickness direction, first row brick is longitudinally arranged standard brick, and second row brick is transversely arranged standard brick;And on both sides of corresponding preset interval of first row brick of even layer, combined brick composed of first special-shaped brick and second special-shaped brick is provided with mother brick.The present application realizes collaborative compensation of thermal expansion in horizontal direction and vertical direction, avoids stress concentration, and at the same time ensures that filling material in joint is stable and not easy to fall off.

Description

Technical Field

[0001] This invention relates to the field of industrial furnace wall technology, specifically to an I-shaped expansion joint structure for industrial furnace walls. Background Technology

[0002] Industrial furnaces are indispensable core thermal equipment in industries such as metallurgy, petrochemicals, and ceramics. Their furnace walls are typically constructed from refractory materials such as refractory bricks and castables. During operation, these walls withstand temperatures of hundreds to thousands of degrees Celsius for extended periods. Solid materials expand linearly when heated, and refractory materials are no exception. If this thermal expansion effect is not properly addressed during furnace wall design and construction, the accumulated expansion stress will directly affect the furnace wall structure, potentially leading to cracking, deformation, or even collapse, severely impacting the furnace's service life. Therefore, to ensure the long-term safe and stable operation of industrial furnaces, expansion joints must be scientifically incorporated into the furnace wall structure to systematically absorb and compensate for the volume changes caused by heating in the refractory materials.

[0003] The existing technology has the following technical problems: First, traditional expansion joint structures have a single compensation direction, mainly absorbing the horizontal expansion of the furnace wall, while their compensation capacity for vertical thermal expansion is weak. Second, the refractory fiber blanket filling the joint is prone to loosening, falling off, or even escaping under the long-term scouring of high-temperature airflow or the positive pressure inside the furnace, leading to expansion joint seal failure, increased heat loss, and in severe cases, high-temperature flames may burst out and burn the furnace shell. To solve the problem of furnace wall thermal expansion, a "Z"-shaped expansion joint is usually adopted, which improves the expansion compensation capacity to a certain extent by increasing the length of the expansion path. However, the "Z"-shaped expansion joint still faces insurmountable technical problems in practical applications: First, the sharp geometric abrupt change at the corners of the "Z"-shaped structure makes it easy for thermal expansion stress to concentrate at these corners. Under long-term thermal cycling, the furnace wall is prone to cracking from the stress concentration points, affecting the furnace life. Second, the refractory fiber blanket filling the joint is prone to loosening, falling off, or even escaping under the long-term scouring of high-temperature airflow or the positive pressure fluctuations inside the furnace, leading to the failure of the expansion joint seal, increased heat loss, and in severe cases, high-temperature flames may burst out and burn the furnace shell, causing safety accidents. Third, the multi-layered folded structure of the "Z"-shaped joint requires high masonry precision, making construction difficult. Even slight deviations may affect the normal function of the expansion joint, increasing construction costs and error rates. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides a U-shaped expansion joint structure for an industrial furnace wall. This structure effectively compensates for the horizontal thermal expansion of the furnace wall while simultaneously absorbing the vertical thermal expansion, avoiding stress concentration caused by structural angles, and ensuring that the filling material within the joint remains stable and does not easily detach under the influence of high-temperature airflow.

[0005] To achieve the above objectives, the present invention employs the following technical solution: An industrial furnace wall I-shaped expansion joint structure is disclosed. The furnace wall is constructed from multiple standard refractory bricks, first shaped bricks, second shaped bricks, and mother bricks. I-shaped expansion joints extending along the height direction Z of the furnace wall are periodically arranged at the same preset intervals along the X-direction of the furnace wall length. Odd-numbered layers include a first row of bricks and a second row of bricks arranged side by side along the Y-direction of the furnace wall thickness. The first row of bricks consists of multiple standard refractory bricks arranged laterally along the X-direction of the furnace wall length, and the second row of bricks consists of multiple standard refractory bricks arranged longitudinally along the X-direction. Even-numbered layers also include a first row of bricks and a second row of bricks arranged side by side along the Y-direction of the furnace wall thickness. The first row of bricks consists of multiple standard refractory bricks arranged longitudinally along the X-direction of the furnace wall length, and the second row of bricks consists of multiple standard refractory bricks arranged laterally along the X-direction. Furthermore, on both sides of the first row of bricks at corresponding preset intervals, there are parallel composite bricks and mother bricks. The composite bricks are composed of first shaped bricks and second shaped bricks.

[0006] Furthermore, the I-shaped expansion joint includes a first I-shaped expansion joint and a second I-shaped expansion joint, which are parallel to each other; in even-numbered layers, the first I-shaped expansion joint is between the first shaped brick and the second shaped brick, as well as between two corresponding transverse standard refractory bricks; the second I-shaped expansion joint is between the first shaped brick and the mother brick.

[0007] Furthermore, the first I-shaped expansion joint is filled with a first expansion joint fiberboard, and the second I-shaped expansion joint is filled with a second expansion joint fiberboard.

[0008] Furthermore, the first irregularly shaped brick and the second irregularly shaped brick are cut from the mother brick.

[0009] Furthermore, the first irregularly shaped brick has protrusions and grooves, with the groove size corresponding to that of the second irregularly shaped brick.

[0010] Furthermore, the first irregularly shaped brick is L-shaped, and the second irregularly shaped brick is a corresponding rectangle.

[0011] Furthermore, the standard refractory brick, the first shaped brick, the second shaped brick, and the mother brick all have the same thickness, which is 65~70mm.

[0012] Furthermore, the standard refractory brick has a length of 220~240mm and a width of 110~120mm.

[0013] Furthermore, the length of the mother brick is 220~240mm and the width is 165~180mm.

[0014] Furthermore, the second irregularly shaped brick has a length of 110~120mm and a width of 75~90mm.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Multidimensional expansion and synergistic compensation significantly enhances compensation capabilities. This invention achieves multi-dimensional synergistic compensation for the thermal expansion of the furnace wall by alternately constructing odd-numbered and even-numbered layers along the height of the furnace wall, forming a |-shaped expansion joint extending along the height of the furnace wall. Specifically, the |-shaped expansion joint includes a vertical main channel running along the Z-axis and a horizontal compensation cavity naturally formed by the odd-even layer construction structure. When the furnace wall expands due to heat, the vertical main channel is mainly responsible for absorbing the horizontal (X-axis) expansion of the furnace wall, while the horizontal compensation cavity is mainly responsible for absorbing the vertical (Z-axis) expansion of the furnace wall. Through the above structural design, this invention overcomes the deficiency of traditional expansion joints that only compensate in one direction, achieving synergistic and efficient absorption of thermal expansion in both the horizontal and vertical directions.

[0016] 2. Uniform stress distribution and excellent crack resistance. The I-shaped expansion joint formed by this invention has a smooth, vertical, straight outline, without the sharp angles of a Z-shaped expansion joint, thus completely avoiding stress concentration caused by geometric abrupt changes. Thermal expansion stress is uniformly transmitted and released along the smooth cavity wall, greatly reducing the risk of cracking due to stress concentration under long-term thermal cycling, and significantly improving the overall stability and service life of the furnace wall structure.

[0017] 3. The limiting structure is stable and the sealing performance is long-lasting. This invention utilizes the protruding structure of a first irregularly shaped brick in conjunction with a second irregularly shaped brick to form an effective limiting structure at the L-shaped expansion joint. Specifically, the first irregularly shaped brick is L-shaped, and its protruding portion, together with the adjacent brick surface, compresses and limits the fiberboard in both the first and second expansion joints. This limiting structure ensures that the fiberboard is always tightly pressed into the expansion joint cavity, effectively preventing it from loosening, falling off, or escaping under long-term scouring by high-temperature airflow or fluctuations in positive pressure within the furnace. Because the fiberboard maintains a stable and tight filling state over a long period, the sealing performance of the expansion joint is preserved, avoiding safety hazards such as increased heat loss, furnace shell overheating, or even high-temperature flame leakage caused by seal failure.

[0018] 4. Ingenious structural design, convenient and efficient construction. This invention uses a master brick to cut into first and second irregularly shaped bricks, which can be combined to restore the master brick to its original shape. This design simplifies the preparation of irregularly shaped bricks, eliminating the need for custom molds and reducing material costs. Furthermore, the even-numbered and odd-numbered layers have essentially the same structure, with combined bricks replacing standard bricks only at preset intervals. This ensures a uniform and easy-to-master construction method, significantly reducing construction difficulty and precision requirements, and effectively decreasing construction costs and error rates. In addition, the |-shaped expansion joints are periodically set along the length of the furnace wall at the same preset intervals, facilitating standardized construction and quality control, and demonstrating promising industrial application prospects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure and assembly of the present invention.

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the odd-numbered layers of the present invention at the top layer.

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the even-numbered layers of the present invention on the top layer.

[0022] Figure 4 This is a schematic diagram of the odd-layer three-dimensional structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the even-layer three-dimensional structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the combined state of the first irregular brick and the second irregular brick of the present invention.

[0025] In the diagram: 1. Standard refractory brick; 2. First irregularly shaped brick; 3. Second irregularly shaped brick; 4. Mother brick; 5. Odd-numbered layers; 6. Even-numbered layers; 7. First expansion joint fiberboard; 8. Second expansion joint fiberboard; 9. I-shaped expansion joint; 91. First I-shaped expansion joint; 92. Second I-shaped expansion joint; 10. Preset spacing. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and does not constitute any limitation on the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In the description of this invention, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. Furthermore, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. For techniques and methods known to those skilled in the art, The methods and devices may not be discussed in detail, but where appropriate, the techniques, methods, and devices described should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely for illustrating the technical solutions of the present invention more clearly, and are not intended to limit the scope of protection of the present invention.

[0033] like Figures 1 to 6 As shown, this embodiment provides an I-shaped expansion joint structure for an industrial furnace wall. This structure mainly consists of standard refractory bricks 1, first shaped bricks 2, second shaped bricks 3, a mother brick 4, a first expansion joint fiberboard 7, and a second expansion joint fiberboard 8. The furnace wall is constructed by laying multiple standard refractory bricks 1, first shaped bricks 2, second shaped bricks 3, and mother bricks 4 along the furnace wall's length (X-direction), thickness (Y-direction), and height (Z-direction). I-shaped expansion joints 9 extending along the Z-direction are periodically arranged along the X-direction at the same preset intervals 10.

[0034] like Figure 1 , Figure 6 As shown, the standard refractory brick 1 is a cuboid and serves as the basic masonry unit for the furnace wall. The mother brick 4 is also a cuboid, but its width is greater than that of the standard refractory brick 1. In this embodiment, the standard refractory brick 1 has a length of 230 mm and a width of 115 mm; the mother brick 4 has a length of 230 mm and a width of 172 mm; and the second shaped brick 3 has a length of 115 mm and a width of 82 mm. The dimensions of the first shaped brick 2 are adapted to the second shaped brick 3, and the combined dimensions are identical to those of the mother brick 4.

[0035] The first irregularly shaped brick 2, the second irregularly shaped brick 3, and the mother brick 4 have a specific cutting and forming relationship. Specifically, such as... Figure 6 As shown, the mother brick 4 is a complete rectangular block. After a small rectangular piece is cut off from its upper right side, the remaining part forms the first irregularly shaped brick 2. The first irregularly shaped brick 2 is generally "L"-shaped, that is, a rectangular notch is located on the upper right side of a large rectangle. This notch forms the groove of the first irregularly shaped brick 2, and the solid part around the groove forms the protrusion of the first irregularly shaped brick 2. The small rectangular piece that was cut off is the second irregularly shaped brick 3, and its shape is a rectangle corresponding to the size of the groove. The second irregularly shaped brick 3 is placed in the rectangular notch (groove) of the first irregularly shaped brick 2, and the two can be combined to restore the complete mother brick 4. Through this cutting method, the first irregularly shaped brick 2 and the second irregularly shaped brick 3 can cooperate with each other during construction to form the specific outline of the I-shaped expansion joint 9.

[0036] like Figure 4As shown, the odd-numbered layer 5 consists of two rows of bricks arranged side by side along the Y direction (the thickness direction of the furnace wall). The first row of bricks is constructed by arranging multiple standard refractory bricks 1 laterally along the X direction (the length direction of the furnace wall) (i.e., the length direction of the bricks is parallel to the X direction). The second row of bricks is constructed by arranging multiple standard refractory bricks 1 longitudinally along the X direction (i.e., the length direction of the bricks is perpendicular to the X direction). Gaps are left on both sides of the preset spacing 10 to form a first I-shaped expansion joint 91 and a second I-shaped expansion joint 92.

[0037] like Figure 5 As shown, the even-numbered layer 6 includes a first row of bricks and a second row of bricks arranged side-by-side along the Y-direction of the furnace wall thickness. The first row of bricks is constructed by arranging multiple standard refractory bricks 1 longitudinally along the X-direction of the furnace wall (i.e., the length direction of the bricks is perpendicular to the X-direction), while the second row of bricks is constructed by arranging multiple standard refractory bricks 1 transversely along the X-direction (i.e., the length direction of the bricks is parallel to the X-direction). In the first row of bricks in the even-numbered layer 6, corresponding to the two sides of the preset spacing 10, there are side-by-side composite bricks and mother bricks 4. The composite bricks consist of a first irregularly shaped brick 2 and a second irregularly shaped brick 3.

[0038] like Figures 1 to 3 As shown, odd-numbered layers 5 and even-numbered layers 6 are alternately laid along the Z-direction of the furnace wall height, forming a vertical expansion joint 9 (a vertical expansion joint along the Z-direction of the furnace wall height) extending along the Z-direction at the inner end of the furnace wall. The vertical expansion joint 9 includes a first vertical expansion joint 91 and a second vertical expansion joint 92, which are parallel to each other. The total length of the two joints along the Y-direction is equal to the thickness of the furnace wall, and the distance between the first vertical expansion joint 91 and the second vertical expansion joint 92 (along the X-direction) is equal to the X-direction length of the second irregular brick 3.

[0039] In the even-numbered layers 6, a first I-shaped expansion joint 91 is formed between the first irregular brick 2 and the second irregular brick 3, and between two corresponding horizontally arranged standard refractory bricks 1; a second I-shaped expansion joint 92 is formed between the first irregular brick 2 and the mother brick 4.

[0040] The first I-shaped expansion joint 91 is filled with a first expansion joint fiberboard 7, and the second I-shaped expansion joint 92 is filled with a second expansion joint fiberboard 8. Both the first expansion joint fiberboard 7 and the second expansion joint fiberboard 8 are made of flexible refractory fiber material, possessing good compression resilience and high-temperature resistance, used to absorb the thermal expansion of the furnace wall and maintain a seal. The invention also includes a limiting structure for fixing the fiberboards. The first irregularly shaped brick 2 is "L"-shaped, with its protruding portion forming a protrusion beyond the adjacent brick surface. When the first irregularly shaped brick 2 and the second irregularly shaped brick 3 are laid in the inner row of even-numbered layers 6, the protrusion of the first irregularly shaped brick 2, together with the adjacent brick surface, constitutes a limiting structure. This limiting structure compresses and limits the first expansion joint fiberboard 7 and the second expansion joint fiberboard 8 filled in the first I-shaped expansion joint 91 and the second I-shaped expansion joint 92 from both sides, preventing the fiberboards from loosening or falling off under the scouring of high-temperature airflow.

[0041] The masonry process and working principle of this embodiment will be described in detail below with reference to the accompanying drawings: Masonry process: The first step is to lay out and position the expansion joints on the furnace shell according to the design drawings, accurately marking the location and preset spacing of 10. Simultaneously, prepare standard refractory bricks 1, first irregularly shaped bricks 2 and 3 cut from the mother brick 4, as well as first expansion joint fiberboard 7 and second expansion joint fiberboard 8. The first irregularly shaped brick 2 is L-shaped, and the second irregularly shaped brick 3 is a small rectangular block; the two can be combined to restore the complete mother brick 4.

[0042] The second step is to construct the even-numbered layers (6). According to... Figure 1 The structure shown involves laying standard refractory bricks 1 longitudinally to form the first row of bricks, and then laying them transversely to form the second row of bricks. At positions corresponding to a preset spacing 10 on both sides, composite bricks consisting of first shaped bricks 2 and second shaped bricks 3, along with adjacent mother bricks 4, are laid within the inner row of bricks. After laying, a first I-shaped expansion joint 91 is formed between the first shaped brick 2 and the second shaped brick 3, and a second I-shaped expansion joint 92 is formed between the first shaped brick 2 and the mother brick 4. Subsequently, a first expansion joint fiberboard 7 is vertically placed into the first I-shaped expansion joint 91, and a second expansion joint fiberboard 8 is vertically placed into the second I-shaped expansion joint 92.

[0043] The third step is to construct the odd-numbered layers (5). According to... Figure 4 The structure shown involves arranging standard refractory bricks 1 horizontally to form the first row of bricks, and arranging them longitudinally to form the second row of bricks. Expansion joint spaces corresponding to the even-numbered layers 6 below are reserved on both sides at the preset spacing 10. After construction, the first and second rows of bricks in the odd-numbered layers 5 press the first expansion joint fiberboard 7 and the second expansion joint fiberboard 8 together from above.

[0044] Fourth, alternately repeat the processes of steps two and three above, continuing to build the upper even-numbered layers 6 and odd-numbered layers 5 until the designed furnace wall height is reached. Through the alternating construction of odd-numbered layers 5 and even-numbered layers 6, a |-shaped expansion joint 9 is naturally formed, extending continuously in the Z direction along the height of the furnace wall. This expansion joint includes a vertical main joint channel and a horizontal compensation cavity naturally formed by the odd-even layer construction structure.

[0045] Working principle: When the industrial furnace is heated during operation, the refractory material of the furnace wall expands. At this time, the expansion force in the horizontal direction (X direction) is mainly borne by the vertical main joint of the I-shaped expansion joint 9: the furnace wall extends along the X direction, compressing the fiberboard 7 of the first expansion joint and the fiberboard 8 of the second expansion joint, and the horizontal expansion is absorbed by the compression deformation of the fiberboard.

[0046] The expansion force in the vertical direction (Z direction) is borne by the horizontal compensation cavities at both ends of the I-shaped expansion joint 9: the furnace wall extends along the Z direction, compressing the ends of the fiberboard in the horizontal compensation cavity, and the vertical expansion is absorbed by the compression deformation of the fiberboard.

[0047] At the same time, the limiting structure formed by the "L"-shaped protrusion of the first irregular brick 2 always keeps the first expansion joint fiberboard 7 and the second expansion joint fiberboard 8 in a compressed state, ensuring that the fiberboard can remain stably in the expansion joint cavity when subjected to high-temperature airflow or positive pressure fluctuations in the furnace, and will not loosen, fall off or escape, thereby maintaining good sealing performance for a long time.

[0048] Through the above structural design and working principle, the present invention achieves coordinated and efficient compensation for the thermal expansion of the furnace wall in the horizontal (X-direction) and vertical (Z-direction) directions, avoids the stress concentration problem caused by the sharp angle of the "Z"-shaped expansion joint, and solves the technical problem of easy detachment of fiber materials, significantly improving the overall stability, sealing and service life of the furnace wall.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A U-shaped expansion joint structure for an industrial furnace wall, characterized in that, The furnace wall is constructed from multiple standard refractory bricks (1), first irregular bricks (2), second irregular bricks (3) and mother bricks (4). I-shaped expansion joints (9) extending along the height direction of the furnace wall are periodically arranged at the same preset interval (10) in the X direction along the length of the furnace wall. The odd-numbered layers (5) include a first row of bricks and a second row of bricks arranged side by side along the Y direction of the furnace wall thickness. The first row of bricks consists of multiple standard refractory bricks (1) arranged laterally along the X direction of the furnace wall length, and the second row of bricks consists of multiple standard refractory bricks (1) arranged longitudinally along the X direction. The even-numbered layers (6) include a first row of bricks and a second row of bricks arranged side by side along the Y direction of the furnace wall thickness. The first row of bricks consists of multiple standard refractory bricks (1) arranged longitudinally along the X direction of the furnace wall length. The second row of bricks consists of multiple standard refractory bricks (1) arranged laterally along the X direction. On both sides of the corresponding preset spacing (10) of the first row of bricks, there are side by side combination bricks and mother bricks (4). The combination bricks are composed of a first irregular brick (2) and a second irregular brick (3).

2. The I-shaped expansion joint structure for an industrial furnace wall according to claim 1, characterized in that, The |-shaped expansion joint (9) includes a first |-shaped expansion joint (91) and a second |-shaped expansion joint (92), and the first |-shaped expansion joint (91) and the second |-shaped expansion joint (92) are parallel to each other; In the even-numbered layers (6), the first I-shaped expansion joint (91) is between the first irregular brick (2) and the second irregular brick (3), and between the corresponding two transverse standard refractory bricks (1); the second I-shaped expansion joint (92) is between the first irregular brick (2) and... Between the mother bricks (4).

3. The I-shaped expansion joint structure for an industrial furnace wall according to claim 2, characterized in that, The first I-shaped expansion joint (91) is filled with a first expansion joint fiberboard (7), and the second I-shaped expansion joint (92) is filled with a second expansion joint fiberboard (8).

4. The I-shaped expansion joint structure for an industrial furnace wall according to claim 2, characterized in that, The first irregular brick (2) and the second irregular brick (3) are cut from the mother brick (4).

5. The I-shaped expansion joint structure for an industrial furnace wall according to claim 4, characterized in that, The first irregular brick (2) has protrusions and grooves, and the groove size corresponds to that of the second irregular brick (3).

6. The I-shaped expansion joint structure for an industrial furnace wall according to claim 5, characterized in that, The first irregular brick (2) is L-shaped, and the second irregular brick (3) is a corresponding rectangle.

7. The I-shaped expansion joint structure for an industrial furnace wall according to claim 1, characterized in that, The standard refractory brick (1), the first irregular brick (2), the second irregular brick (3), and the mother brick (4) all have the same thickness, which is 65~70mm.

8. The I-shaped expansion joint structure for an industrial furnace wall according to claim 7, characterized in that, The standard refractory brick (1) has a length of 220~240mm and a width of 110~120mm.

9. The I-shaped expansion joint structure for an industrial furnace wall according to claim 8, characterized in that, The length of the mother brick (4) is 220~240mm and the width is 165~180mm.

10. The I-shaped expansion joint structure for an industrial furnace wall according to claim 9, characterized in that, The second irregular brick (3) has a length of 110~120mm and a width of 75~90mm.

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