Laying method of thermal insulation material

Abstract

The invention relates to a laying method of a thermal insulation material, and relates to the field of thermal insulation material laying, and the laying method of the thermal insulation material comprises the following steps: S1, pre-welding a plurality of fixing bolts on the outer surfaces of the inner top wall and the side wall of a sealing cover; s2, sequentially laying at least two heat insulation material layers which are laid in a staggered manner to form a heat insulation layer; s3, a metal lining plate is installed on the outer surface of the heat insulation layer, and the metal lining plate is fixedly connected with a nut through a fixing bolt; the heat insulation material layer is an aluminum silicate fiber felt layer, the heat insulation layer comprises an inner layer and an outer layer which are different in thickness, the inner layer and the outer layer are formed by splicing a plurality of aluminum silicate fiber felt layers in the circumferential direction of the sealing cover, and the aluminum silicate fiber felt layers in the inner layer and the outer layer are arranged in a staggered mode in the laying direction. The sealing cover has the advantages that the sealing cover is not prone to buckling deformation due to asymmetric heating, and the heat insulation and protection effects of the sealing cover are improved.

Description

Technical Field

[0001] This application relates to the field of thermal insulation material laying, and in particular to a method for laying thermal insulation material. Background Technology

[0002] In industrial sectors such as iron and steelmaking, processes for sintering and steel slag treatment are constantly evolving. In ironmaking, when sinter is processed inside annular coolers, sealed hoods are used to collect and centrally treat the flue gas dust. Simultaneously, utilizing waste heat from the flue gas for power generation has become an important means of improving energy efficiency. In steelmaking, steel slag is treated in various ways, such as crushing and then slag-quenching. These processes are of great significance for resource recovery and environmental protection.

[0003] In past industrial production, various methods were typically employed to address the heat loss problem of sealing covers. One common approach was to directly add a heat-insulating coating to the cover, reducing heat transfer through the coating's insulation properties and thus mitigating the cover's heating effect. Another method involved laying a single layer of insulation material, utilizing its properties to block heat. Additionally, some companies increased the cover's thickness to improve insulation. However, under high-temperature conditions, sealing covers are prone to warping and deformation due to asymmetrical heating, affecting their normal use and flue gas collection efficiency. Furthermore, insufficient optimization of the interfacial thermal resistance of multi-layer insulation materials leads to frequent localized overheating, further exacerbating damage to the cover. Moreover, the mechanical fixing structure lacks reliability under thermal cycling conditions, making the connection between the insulation material and the cover prone to loosening, reducing the effectiveness of insulation and protection. Summary of the Invention

[0004] In order to prevent the sealing cover from warping and deforming due to asymmetrical heating and to improve the heat insulation and protection effect of the sealing cover, this application provides a method for laying heat insulation material.

[0005] This application provides a method for laying thermal insulation materials, which adopts the following technical solution: A method for laying thermal insulation material includes the following steps: S1. Pre-weld multiple fixing bolts to the top wall and outer surface of the side wall inside the sealing cover; S2. Lay at least two layers of interleaved insulation material to form an insulation layer; S3. Install a metal liner on the outer surface of the insulation layer, and fix the metal liner to the nut by the fixing bolt.

[0006] By adopting the above technical solution, multiple fixing bolts are pre-welded to the top wall and outer surface of the side walls of the sealing cover, providing a stable foundation for subsequent laying of insulation materials and installation of metal liners. The two layers of insulation materials laid in an alternating pattern effectively increase the heat transfer path, improve the thermal resistance of the insulation layer, and reduce heat loss, thereby enhancing the insulation effect of the sealing cover. Simultaneously, the alternating laying also avoids heat concentration, preventing deformation of the sealing cover due to localized overheating. The metal liners protect the insulation layer, preventing damage from external factors and extending its service life. Furthermore, the metal liners enhance the overall structural strength of the sealing cover. Due to the improved insulation effect and enhanced structural strength, the sealing cover is less prone to warping and deformation due to asymmetrical heating, ensuring normal operation of the sealing cover under high-temperature conditions, reducing flue gas leakage caused by deformation, and improving flue gas collection efficiency.

[0007] Optionally, the heat insulation material layer is an aluminum silicate fiber felt layer. The heat insulation layer includes an inner layer and an outer layer with different thicknesses. Both the inner layer and the outer layer are spliced ​​together from multiple aluminum silicate fiber felt layers along the circumference of the sealing cover. The aluminum silicate fiber felt layers in the inner layer and the outer layer are laid in a staggered arrangement.

[0008] By adopting the above technical solution, the inner and outer aluminum silicate fiber felt layers are laid in a staggered manner, which can seal the splicing gap between two adjacent aluminum silicate fiber felt layers in the inner layer, improve the heat insulation effect, and reduce heat loss.

[0009] Optionally, the inner layer has a thickness of 48-52 mm, and the outer layer has a thickness of 18-22 mm.

[0010] By adopting the above technical solution, when laying the insulation material, the thickness of the inner aluminum silicate fiber felt layer is 48-52mm, and the thickness of the outer aluminum silicate fiber felt layer is 18-22mm. The combination of insulation materials with this thickness can improve thermal resistance, reduce heat loss, and reduce the temperature difference between the inner and outer surfaces of the sealing cover.

[0011] Optionally, the metal lining plate is a stainless steel lining plate, and the metal lining plate includes multiple splicing units. The splicing points of adjacent splicing units are laid in a staggered overlapping manner to form an overall covering structure.

[0012] By adopting the above technical solution, stainless steel material has good corrosion resistance and high temperature resistance, and can maintain stable performance in high temperature environments. The metal liner is composed of multiple splicing units. During installation, the splicing points of adjacent splicing units are laid in a staggered overlapping manner so that the splicing units overlap each other to form a continuous and tight protective structure. This can avoid large-area splicing gaps, reduce heat loss from the gaps, improve the overall heat insulation performance of the metal liner, and the overlapping of the metal liner can stretch freely after being heated, reducing surface deformation and reducing the amount of deformation caused by uneven heating of the cover.

[0013] Optionally, the metal backing plate has a thickness of 0.8-1.2mm, and the adjacent splicing units overlap by 18-20mm.

[0014] By adopting the above technical solution, installing a 0.8-1.2mm thick metal lining plate in conjunction with the heat insulation material layer further improves the stability of the heat insulation structure and reduces the overall maintenance cost. The 20mm overlap between adjacent splicing units allows the cover to stretch freely after being heated, reducing surface deformation and the amount of cover deformation.

[0015] Optionally, the fixing bolt passes through the metal liner and is threaded with an inner nut and an outer nut, the inner nut and the outer nut are engaged to lock together, and a washer is provided between the outer nut and the metal liner.

[0016] By adopting the above technical solution, the inner and outer nuts are threaded onto the fixing bolts and locked together, so that the metal liner is firmly installed on the outer surface of the insulation layer, protecting the inner insulation layer and improving the reliability of the entire insulation structure; the gasket between the outer nut and the metal liner can prevent the outer nut from directly contacting the metal liner, reducing stress concentration at the connection and avoiding damage to the surface of the metal liner.

[0017] Optionally, the fixing bolts are distributed at predetermined intervals along the surface of the sealing cover.

[0018] By adopting the above technical solution, when laying the insulation material of the sealing cover, stainless steel fixing bolts are first pre-welded at predetermined intervals on the inner surface of the sealing cover. Then, the insulation material layers are laid sequentially to form the insulation layer. Finally, the metal liner is fixedly connected to the sealing cover using these fixing bolts and nuts. The fixing method of distributing the fixing material at predetermined intervals ensures that the metal liner and the insulation layer are evenly stressed, guaranteeing the stability and reliability of the entire laying structure, avoiding structural damage caused by uneven local stress, and also better utilizing the insulation effect of the insulation layer, reducing the deformation of the cover.

[0019] Optionally, the fixing bolts are made of M10 stainless steel, the length L of the fixing bolts is 85mm, and the spacing between the fixing bolts is 300x500mm.

[0020] By adopting the above technical solution, the M10 fixing bolts are laid on the surface of the sealing cover at a spacing of 300x500mm, which can evenly distribute the force and reduce the warping deformation of the sealing cover caused by asymmetrical heating under high temperature conditions. When laying the heat insulation material and installing the metal liner, the fixing bolts serve as the connection base, so that the metal liner can be firmly installed on the outer surface of the heat insulation layer, ensuring the stability of the overall structure.

[0021] In summary, this application includes at least one of the following beneficial technical effects: Due to the improved heat insulation and enhanced structural strength, the sealing cover is less prone to warping and deformation due to asymmetrical heating, ensuring its normal operation under high-temperature conditions, reducing flue gas leakage caused by deformation, and improving flue gas collection efficiency.

[0022] The inner and outer layers of aluminum silicate fiber felt are laid in a staggered direction, which allows the outer layer of aluminum silicate fiber felt to seal the splicing gap between two adjacent layers of aluminum silicate fiber felt in the inner layer. The two layers of heat insulation material laid in a staggered manner can effectively increase the heat transfer path, improve the thermal resistance of the heat insulation layer, and reduce heat loss, thereby improving the heat insulation effect of the sealing cover. At the same time, the staggered laying can also avoid heat concentration and prevent the sealing cover from deforming due to local overheating. The metal lining is composed of multiple splicing units. During installation, the splicing joints of adjacent splicing units are laid in a staggered manner so that the splicing units overlap each other, forming a continuous and tight protective structure. This can avoid large-area splicing gaps, reduce heat loss from the gaps, and improve the overall heat insulation performance of the metal lining. In addition, the overlapping of the metal lining can stretch freely after being heated, reducing surface deformation and minimizing the deformation of the cover. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of the installation location of the sealing cover in this application; Figure 2 This is a partial cross-sectional view of the sealing cover; Figure 3 It means Figure 2 A magnified schematic diagram of part A in the middle section; Figure 4 This is a schematic diagram showing the structure of the inner and outer layers of the insulation layer being laid in an alternating pattern; Figure 5 It means Figure 4 A partially enlarged structural diagram of section B; Figure 6 This is a structural diagram showing that the splicing units in the metal backing plate are in an overlapping state; Figure 7 It means Figure 6 A magnified schematic diagram of part C in the middle.

[0024] Explanation of reference numerals in the attached drawings: 1. Sealing cover; 2. Fixing bolt; 21. Inner nut; 22. Outer nut; 3. Insulation layer; 31. Inner layer; 32. Outer layer; 4. Metal liner; 41. Splicing unit. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0026] This application discloses a method for laying thermal insulation material. (Refer to...) Figure 1 and Figure 2 The method for laying the thermal insulation material includes several steps: pre-welding fixing bolts 2 to the inner top wall and outer side wall of the sealing cover 1, laying the thermal insulation layer 3, and installing the metal liner 4. First, multiple fixing bolts 2 are pre-welded to the inner surface of the sealing cover 1. Then, at least two layers of staggered thermal insulation material are laid sequentially to form the thermal insulation layer 3. Finally, the metal liner 4 is installed on the outer surface of the thermal insulation layer 3. The metal liner 4 is fixed to the sealing cover by the fixing bolts 2 and nuts. The fixing bolts 2 provide a stable foundation for the thermal insulation material layer and the metal liner 4. The staggered thermal insulation material layer effectively optimizes the interfacial thermal resistance of the multi-layer thermal insulation material, achieving the effects of reducing the deformation of the cover, increasing thermal resistance, increasing flue gas collection efficiency, and reducing overall maintenance costs.

[0027] Specifically, refer to Figure 2 and Figure 3 In the step of pre-welding multiple fixing bolts 2 onto the surface of the sealing cover 1, the fixing bolts 2 are made of 304 stainless steel, which has good high-temperature resistance and corrosion resistance. The fixing bolts 2 are M10 type, with a length L of 85mm. The fixing bolts 2 are distributed along the surface of the sealing cover 1 at predetermined intervals of 300x500mm, which can evenly distribute the force and reduce the warping deformation of the sealing cover 1 caused by asymmetrical heating under high-temperature conditions. The welding rod used is A309 to ensure the quality and strength of the weld. The bolt material can also be other high-temperature resistant alloy materials, and other suitable models of welding rods can be selected according to the actual situation. The welding process needs to ensure the perpendicularity of the bolts and the firmness of the weld to avoid loosening in subsequent use.

[0028] Specifically, refer to Figure 4 and Figure 5In the step of laying at least two layers of interleaved insulation material to form insulation layer 3, the insulation material layer is an aluminum silicate fiber felt layer, which has good heat insulation and high temperature resistance. Insulation layer 3 includes an inner layer 31 and an outer layer 32 with different thicknesses. The inner layer 31 is 48-52mm thick, and the outer layer 32 is 18-22mm thick. For example, the inner layer 31 can be 50mm thick, and the outer layer 32 can be 20mm thick. Both the inner layer 31 and the outer layer 32 are spliced ​​together from multiple aluminum silicate fiber felt layers along the circumference of the sealing cover 1, and the aluminum silicate fiber felt layers in the inner layer 31 and the outer layer 32 are laid in a staggered direction. The staggered arrangement allows the aluminum silicate fiber felt layer of the outer layer 32 to seal the splicing gaps between two adjacent aluminum silicate fiber felt layers in the inner layer 31, improving the heat insulation effect and reducing heat loss. Replaceable insulation materials can also be ceramic fiber felt, which also has good heat insulation performance. When laying the insulation, pay attention to the tight fit between each layer to avoid gaps that could affect the insulation effect.

[0029] Specifically, refer to Figure 3 , Figure 6 , Figure 7 In the step of installing a metal liner 4 on the outer surface of the insulation layer 3, the metal liner 4 is fixedly connected to the nut by fixing bolts 2. The metal liner 4 is a stainless steel liner with a thickness of 0.8-1.2mm, preferably 1mm thick. The stainless steel liner has good high temperature resistance and oxidation resistance. The edges of the stainless steel liner are connected by overlapping to form an integral covering structure. The metal liner 4 includes multiple splicing units 41. The splicing points of adjacent splicing units 41 are staggered and overlapped, with an overlap of 20mm between adjacent splicing units 41. During installation, the staggered overlapping of adjacent splicing units 41 allows the splicing units 41 to overlap each other, forming a continuous and tight protective structure. This avoids large-area splicing gaps, reduces heat loss from the gaps, and improves the overall heat insulation performance of the metal liner 4. In addition, the overlapping setting of the metal liner 4 allows it to stretch freely after being heated, reducing surface deformation and reducing the amount of deformation caused by uneven heating of the cover. The fixing bolt 2 passes through the metal liner 4 and is threaded with an inner nut 21 and an outer nut 22. The inner nut 21 and the outer nut 22 are fitted together and locked in place, ensuring that the metal liner 4 is securely installed on the outer surface of the insulation layer 3, thus protecting the inner insulation layer 3. A washer is provided between the outer nut 22 and the metal liner 4 to prevent the outer nut 22 from directly contacting the metal liner 4, reducing stress concentration at the connection point and preventing damage to the surface of the metal liner 4.

[0030] The implementation principle of the method for laying thermal insulation material in this embodiment is as follows: In this embodiment, fixing bolts 2 are pre-welded to the surface of the sealing cover 1 to provide a fixing foundation for the subsequent thermal insulation material layer and metal liner 4. Then, two layers of staggered aluminum silicate fiber felt are used as thermal insulation material, which optimizes the interface thermal resistance of the multi-layer thermal insulation material and reduces local overheating. The sealing of the splicing gap of the inner layer 31 by the outer layer 32 aluminum silicate fiber felt further improves the thermal insulation effect. The installation of the metal liner 4 is not only used to protect the thermal insulation material layer, but also reduces the warping deformation of the sealing cover 1 caused by asymmetrical heating under high temperature conditions through staggered overlapping, thereby increasing the thermal resistance and increasing the flue gas collection efficiency.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for laying thermal insulation material in a sealing cover, characterized in that, Includes the following steps: S1. Pre-weld multiple fixing bolts (2) to the top wall and the outer surface of the side wall inside the sealing cover (1); S2. Lay at least two layers of interleaved insulation material in sequence to form an insulation layer (3); S3. Install a metal liner (4) on the outer surface of the heat insulation layer (3), and fix the metal liner (4) to the nut by the fixing bolt (2).

2. The laying method according to claim 1, characterized in that, The heat insulation material layer is an aluminum silicate fiber felt layer. The heat insulation layer (3) includes an inner layer (31) and an outer layer (32) with different thicknesses. Both the inner layer (31) and the outer layer (32) are spliced ​​together from multiple aluminum silicate fiber felt layers along the circumference of the sealing cover (1). The aluminum silicate fiber felt layers in the inner layer (31) and the outer layer (32) are laid in a staggered manner.

3. The laying method according to claim 2, characterized in that, The inner layer (31) has a thickness of 48-52 mm, and the outer layer (32) has a thickness of 18-22 mm.

4. The laying method according to claim 1, characterized in that, The metal liner (4) is a stainless steel liner, and the metal liner (4) includes multiple splicing units (41). The splicing points of adjacent splicing units (41) are laid out in a staggered manner to form an overall covering structure.

5. The laying method according to claim 4, characterized in that, The adjacent splicing units (41) overlap by 20mm.

6. The laying method according to claim 4, characterized in that, The fixing bolt (2) passes through the metal liner (4) and is threaded with an inner nut (21) and an outer nut (22). The inner nut (21) and the outer nut (22) are locked together. A washer is provided between the outer nut (22) and the metal liner (4).

7. The laying method according to claim 1, characterized in that, The fixing bolts (2) are distributed at predetermined intervals along the surface of the sealing cover (1).

8. The laying method according to claim 7, characterized in that, The fixing bolt (2) is made of M10 stainless steel, the length L of the fixing bolt (2) is 85mm, and the spacing of the fixing bolt (2) is 300x500mm.

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