A structure for preventing collapse of a brick partition masonry of tertiary air duct
By using a combination of segmented whole brick masonry, retaining brick rings, calcium silicate boards, and castable refractory in the tertiary air duct, the collapse problem caused by thermal stress in the tertiary air duct was solved, and the stability and safety of the structure were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JUXIAN ZHONGLIAN CEMENT CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-07-03
AI Technical Summary
Under high-temperature thermal stress, refractory bricks in tertiary air ducts are prone to sinking and collapse, leading to safety accidents. Existing masonry structures cannot effectively prevent collapse.
The structure is constructed using multiple segmented whole bricks, combined with retaining rings, calcium silicate boards, and castable refractory. Staggered joints and high-temperature refractory mortar bonding are used to form a stable masonry structure. Calcium silicate boards are fixed with nails to reduce the risk of brick displacement.
It effectively prevents brick misalignment, loosening and collapse, reduces ammonia leakage, improves structural stability, avoids safety accidents, and extends the service life of refractory bricks.
Smart Images
Figure CN224455409U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cement industry technology, and in particular to a structure for preventing collapse of a three-stage air duct by using whole brick partition masonry. Background Technology
[0002] In the cement production industry, the tertiary air duct is a key component of the rotary kiln system. Its operation directly affects production efficiency, product quality, and corporate economic benefits. As the scale of cement production expands and process requirements increase, the working conditions faced by the tertiary air duct become increasingly complex. The drawbacks of traditional masonry structures have gradually become apparent, prompting the emergence of new masonry technologies. Among these, the whole-brick partition masonry structure to prevent collapse is of great significance.
[0003] During actual production and operation, due to the influence of high-temperature thermal stress, the top of the integral bricks in the tertiary air duct sinks. When the kiln is stopped for cooling and maintenance, the upper half of the ring bricks in the tertiary air duct will sink due to the shrinkage of the refractory bricks. If the temperature is raised again, the alkali-resistant bricks that have already sunk will not rise. In each cooling and heating process, the expansion of the entire ring bricks will increase, while the expansion of the castable between the sections is very small. Due to the action of the nails, they are tightly attached to the shell steel plate, which aggravates the damage of the insulation layer by the dust-containing high-temperature gas when the refractory bricks shrink and collapse, until the brick body collapses, resulting in a major safety accident.
[0004] Therefore, there is an urgent need to provide a structure for preventing collapse of the three-stage air duct by using whole brick partitions to solve the above problems. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a structure for preventing collapse of the three-stage air duct whole brick partition masonry.
[0006] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: providing a three-stage air duct whole brick partition masonry structure to prevent collapse, including multiple sections, both ends of the multiple sections are masonry with multiple whole bricks, the inner walls of the multiple sections are fixedly connected with brick retaining rings at both ends, the inner walls of the multiple sections are installed with calcium silicate boards, and the outer walls of the multiple calcium silicate boards are respectively masonry with first-size and second-size silicate red bricks.
[0007] The present invention is further configured such that multiple whole bricks are closely fitted together and arranged sequentially along the circumferential direction of the broken joints to form a continuous and stable masonry structure.
[0008] Through the above technical solution, the tightly fitted whole bricks can effectively reduce the gaps between bricks, thereby greatly reducing the risk of ammonia leakage. Furthermore, the whole bricks arranged in sequence along the circumference form a continuous whole. This structural method can evenly distribute the pressure from inside the pipe and various external forces.
[0009] The present invention is further configured such that: a castable refractory is filled between two adjacent retaining brick rings, the castable refractory is tightly bonded to the retaining brick ring, and the expansion amount of the castable refractory is less than the expansion amount of the silicon molybdenum red brick.
[0010] Through the above technical solution, when the silicon-muzzle red brick expands or contracts due to factors such as temperature changes, the retaining ring can better restrict the displacement of the silicon-muzzle red brick by means of its tight connection with the castable. Since the expansion amount of the castable is less than that of the silicon-muzzle red brick, the castable will not generate additional compressive stress on the brick body and the retaining ring due to excessive expansion during the expansion process of the silicon-muzzle red brick, thus maintaining the stability of the entire structure and preventing the brick body from being misaligned, loose, or even collapsing.
[0011] The present invention is further configured such that the calcium silicate board is fixed to the inner wall of the broken section by a pin.
[0012] With the above technical solution, one end of the nail is welded to the inner wall of the broken section, and the other end penetrates the calcium silicate board, partially extending into the space between adjacent first-size and second-size silicate bricks or into the cast-in-place material. As a heat insulation layer, the stability of the calcium silicate board is crucial. Welding one end of the nail to the inner wall of the broken section provides a reliable fixing point for the calcium silicate board, while the other end penetrates the calcium silicate board and partially extends into the space between adjacent silicate bricks or into the cast-in-place material. This connection method can effectively prevent the calcium silicate board from shifting or falling off during pipeline operation due to vibration, temperature changes, or other external forces.
[0013] The present invention is further configured such that: the multiple whole bricks, the first-sized silicon-molybdenum red bricks and the second-sized silicon-molybdenum red bricks are all laid in a staggered manner, and the vertical gaps of adjacent bricks are staggered.
[0014] Through the above technical solutions, staggered joint masonry makes the vertical gaps between adjacent bricks staggered, avoiding the occurrence of continuous joints. Continuous joints will cause the masonry to form a weak link in that part. When subjected to external forces, it is easy to break or be damaged along the continuous joint. Staggered joint masonry can enhance the interlocking force between bricks and make the force transmission more uniform.
[0015] The present invention is further configured such that a plurality of first-size and second-size silica-muzzle red bricks are laid on the outer wall of the calcium silicate board in a ratio of 45:44.
[0016] Through the above technical solution, the first-size and second-size silicon-muzzle red bricks differ in size and shape, which gives them different performance characteristics. When laid in a 45:44 ratio, the advantages of the two types of bricks can be fully utilized. The larger bricks may perform well in bearing pressure and resisting erosion, while the smaller bricks can play a role in filling gaps and enhancing structural flexibility. By matching them in a specific ratio, the entire masonry structure can maintain good performance under various working conditions, reducing brick damage caused by unsuitable working conditions.
[0017] The present invention is further configured such that: the multiple whole bricks, the first-sized silicon-muzzle red bricks and the second-sized silicon-muzzle red bricks, and the calcium silicate board are all bonded together with high-temperature refractory mortar, as well as between adjacent bricks.
[0018] Through the above technical solution, high-temperature refractory mortar has good bonding performance, which can firmly bond the whole brick, the first-size silica-molybdenum red brick, the second-size silica-molybdenum red brick and the calcium silicate board together. The bonding effect of high-temperature refractory mortar makes the components form a tight whole, effectively resisting these external forces, preventing the bricks from separating from the calcium silicate board, and preventing adjacent bricks from loosening and misaligning, thus ensuring the stability of the entire structure.
[0019] The beneficial effects of this utility model are as follows:
[0020] 1. This utility model uses whole bricks to build both ends of each section, which can effectively prevent the shrinkage and deformation of bricks from eroding and damaging the calcium silicate board, protect the service life of the refractory bricks in each section, avoid the situation of kiln shutdown and emergency repair caused by shrinkage and deformation of refractory bricks in the tertiary air duct and large-area damage to calcium silicate board, and also prevent major safety accidents caused by the burn-through of the tertiary air duct.
[0021] 2. This utility model uses a 45:44 ratio of first-size and second-size Simuir red bricks. The larger bricks may perform well in bearing pressure and resisting erosion, while the smaller bricks can play a role in filling gaps and enhancing structural flexibility. By matching them in a specific ratio, the entire masonry structure can maintain good performance under various working conditions, reducing brick damage caused by unsuitable working conditions. Attached Figure Description
[0022] Figure 1 This is a perspective view of the present utility model;
[0023] Figure 2 This is a schematic diagram of the two-section connection structure of this utility model;
[0024] Figure 3 This is a schematic diagram of the calcium silicate board structure of this utility model;
[0025] Figure 4The diagram shows the structure of the first-size and second-size silicon-muzzle red bricks of this utility model.
[0026] In the diagram: 1. Broken section; 2. Whole brick; 3. Brick retaining ring; 4. Calcium silicate board; 5. First-size silica-muzzle red brick; 6. Second-size silica-muzzle red brick. Detailed Implementation
[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0028] Please see Figure 1 and Figure 2 A tertiary ventilation duct brickwork structure for preventing collapse includes multiple sections 1, with multiple whole bricks 2 at both ends of each section 1. The whole bricks 2 are tightly fitted together and arranged sequentially along the circumferential direction of the sections 1 to form a continuous and stable masonry structure. The tightly fitted whole bricks can effectively reduce the gaps between bricks, thereby greatly reducing the risk of ammonia leakage. Furthermore, the whole bricks arranged sequentially along the circumferential direction form a continuous whole. This structural method can evenly distribute the pressure from inside the pipe and various external forces.
[0029] like Figure 1 - Figure 3 As shown, multiple sections 1 have brick retaining rings 3 fixedly connected to both ends of their inner walls. The space between two adjacent brick retaining rings 3 is filled with castable refractory. The castable refractory is tightly bonded to the brick retaining rings 3, and the expansion amount of the castable refractory is less than that of the silicon-muzzle red brick. When the silicon-muzzle red brick expands or contracts due to factors such as temperature changes, the brick retaining rings 3 can better restrict the displacement of the silicon-muzzle red brick by means of the tight connection with the castable refractory. Since the expansion amount of the castable refractory is less than that of the silicon-muzzle red brick, during the expansion process of the silicon-muzzle red brick, the castable refractory will not generate additional compressive stress on the brick body and brick retaining rings 3 due to excessive expansion, thus maintaining the stability of the entire structure and preventing the brick body from being misaligned, loose, or even collapsing.
[0030] like Figure 3 and Figure 4As shown, calcium silicate boards 4 are installed on the inner walls of multiple sections 1. The calcium silicate boards 4 are fixed to the inner walls of sections 1 by rivets. One end of the rivet is welded to the inner wall of section 1, and the other end penetrates the calcium silicate board 4, partially extending into the space between adjacent first-size and second-size silicate bricks 5 and 6, or into the cast-in-place material. As a heat insulation layer, the stability of the calcium silicate board 4 is crucial. The rivet's welded-to-the-inner-wall provides a reliable fixing point for the calcium silicate board 4, while the other end penetrates the calcium silicate board 4 and partially extends into the space between adjacent silicate bricks or into the cast-in-place material. This connection method effectively prevents the calcium silicate board 4 from becoming stuck in the pipeline. During operation, displacement and detachment may occur due to vibration, temperature changes, or other external forces. The outer walls of multiple calcium silicate boards 4 are respectively constructed with first-size silica-muzzle red bricks 5 and second-size silica-muzzle red bricks 6. Multiple whole bricks 2, first-size silica-muzzle red bricks 5, and second-size silica-muzzle red bricks 6 are all laid using a staggered joint method, with the vertical joints of adjacent bricks offset from each other. This staggered joint construction avoids the formation of continuous joints, which would create weak points in the masonry, making it prone to breakage or damage under external forces. The staggered joint construction, on the other hand, strengthens the interlocking force between the bricks. The force transmission is more uniform. Multiple first-size silica-muzzle red bricks 5 and second-size silica-muzzle red bricks 6 are laid on the outer wall of the calcium silicate board 4 in a 45:44 ratio. The first-size silica-muzzle red bricks 5 and the second-size silica-muzzle red bricks 6 differ in size and shape, and this difference gives them different performance characteristics. Laying them in a 45:44 ratio can give full play to the advantages of the two types of bricks. The larger bricks may perform better in bearing pressure and resisting erosion, while the smaller bricks can play a role in filling gaps and enhancing structural flexibility. Through a specific ratio, the entire masonry structure can withstand various working conditions. To maintain good performance and reduce brick damage caused by unsuitable working conditions, high-temperature refractory mortar is used to bond multiple whole bricks 2, first-size silica-muzzle red bricks 5, second-size silica-muzzle red bricks 6, and calcium silicate board 4, as well as between adjacent bricks. The high-temperature refractory mortar has good bonding properties, which can firmly bond the whole bricks 2, first-size silica-muzzle red bricks 5, second-size silica-muzzle red bricks 6, and calcium silicate board 4 together. The bonding effect of the high-temperature refractory mortar makes the components form a tight whole, effectively resisting these external forces, preventing the bricks from separating from the calcium silicate board 4, and preventing adjacent bricks from loosening and misaligning, thus ensuring the stability of the entire structure.
[0031] In use, at the installation site of the tertiary air duct, multiple sections 1 are first positioned according to the design requirements. Then, at both ends of the inner wall of each section 1, the retaining brick rings 3 are firmly fixed by welding to ensure a tight connection with the section 1. Subsequently, calcium silicate boards 4 are laid on the inner wall of the section 1 and fixed with nails. First-size silicate red bricks 5 and second-size silicate red bricks 6 are selected in a 45:44 ratio and laid on the outer wall of the calcium silicate board 4 using a staggered joint method. At the same time, high-temperature refractory mortar is applied between the bricks and the calcium silicate board 4, as well as between adjacent bricks, to ensure a strong bond. At both ends of the section 1, multiple whole bricks 2 are laid tightly and sequentially along the circumference, and are also bonded with high-temperature refractory mortar. Finally, grout is filled between two adjacent retaining brick rings 3 to ensure a tight bond with the retaining brick rings 3, thus completing the installation of the entire anti-collapse structure.
[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A structure for preventing collapse of brickwork of a partition of whole bricks of tertiary air duct, comprising a plurality of sections (1), characterized in that: Multiple whole bricks (2) are built at both ends of multiple sections (1), and brick retaining rings (3) are fixedly connected to the inner walls of multiple sections (1) near both ends. Calcium silicate boards (4) are installed on the inner walls of multiple sections (1), and first-size silicate red bricks (5) and second-size silicate red bricks (6) are respectively built on the outer walls of multiple calcium silicate boards (4).
2. A caving prevention construction of brick partitioning masonry with tertiary air ducts according to claim 1, characterized in that: Multiple whole bricks (2) are closely fitted together and arranged sequentially along the circumferential direction of the joint (1) to form a continuous and stable masonry structure.
3. The tertiary ventilation duct whole-brick partition masonry structure for preventing collapse as described in claim 1, characterized in that: The space between two adjacent retaining rings (3) is filled with castable material, which is tightly bonded to the retaining rings (3), and the expansion amount of the castable material is less than that of the silicon molybdenum brick.
4. A caving prevention construction of brick partitioning masonry with tertiary air ducts according to claim 3, characterized in that: The calcium silicate board (4) is fixed to the inner wall of the section (1) by a nail. One end of the nail is welded to the inner wall of the section (1), and the other end penetrates the calcium silicate board (4) and extends partially into the space between adjacent first-size silicate bricks (5) and second-size silicate bricks (6) or into the cast material.
5. A caving prevention construction of brick partitioning masonry with tertiary air ducts in accordance with claim 1, characterized in that: Multiple whole bricks (2), first-size silicon-muzzle red bricks (5) and second-size silicon-muzzle red bricks (6) are all laid in a staggered manner, with the vertical joints of adjacent bricks being staggered.
6. A caving prevention construction of tertiary air duct whole brick partition masonry according to claim 5, characterized in that: Multiple first-size silica-muzzle red bricks (5) and second-size silica-muzzle red bricks (6) are laid on the outer wall of calcium silicate board (4) in a ratio of 45:
44.
7. A caving prevention construction of brick partitioning masonry with tertiary air ducts according to claim 5, characterized in that: High-temperature refractory mortar is used to bond multiple whole bricks (2), first-size silica-muzzle red bricks (5), and second-size silica-muzzle red bricks (6) to calcium silicate boards (4), as well as between adjacent bricks.