Segmented thermal sleeve

Abstract

The utility model discloses a slidable sectional heat insulation sleeve, comprising: bottom sealing cone (1), large diameter sleeve (2), small diameter sleeve (3), top sealing cone (4), web (5), heat insulation layer (6), the large diameter sleeve (2) is below, and the small diameter sleeve (3) is above, and the both are connected through the plug -in mode, and when the large diameter sleeve (2) and small diameter sleeve (3) produce thermal expansion, the both can produce relative sliding, the scheme makes the size design of heat insulation sleeve flexible, expands the application range of heat insulation sleeve, and the structure of two section sleeves plug -in can produce the design of relative sliding when thermal expansion and can reduce the risk of heat insulation layer's peeling or fault, avoids the emergence of equipment local overtemperature problem.

Description

Technical Field

[0001] This utility model relates to the field of heat insulation sleeve technology, and in particular to a sliding segmented heat insulation sleeve. Background Technology

[0002] A heat-insulating sleeve is a heat-blocking connection device used to connect two pieces of equipment. The connection between the two pieces of equipment includes a lower equipment connection, a middle connecting section connection, and an upper equipment connection. It can prevent high-temperature gas in the equipment from conducting heat to the connection part and causing local overheating of the connection.

[0003] Typically, in a heat-insulating sleeve connecting two pieces of equipment, the lower piece contains high-temperature gas at its top, and its inner wall has a heat-resistant layer. The upper end of the lower piece is connected via a lower piece connector, an intermediate connecting section connector, and an upper piece connector. The upper piece stores a cold medium, and the hot and cold media come into contact at the connector between the two pieces of equipment. When the high-temperature gas from the lower piece overflows and comes into contact with the connector between the upper and lower pieces, heat conduction can cause localized overheating of the connector, posing a safety hazard. Therefore, a heat-insulating sleeve is needed inside the connector to prevent localized overheating. This device is widely used in chemical, petroleum, metallurgical, and power industries, especially in the connector areas of boilers or high-temperature, high-pressure equipment with internal refractory bricks, refractory mortar, or refractory coatings.

[0004] There are various designs for heat insulation sleeves in the existing technology. In order to achieve the purpose of heat insulation, many adopt vacuum heat insulation design. For example, patents such as CN102900913A, CN221665566U, and CN114293925A propose to form a vacuum structure by threaded sealing. However, under the working conditions of high temperature and pressure in the vacuum cavity, the inner cavity pipe wall thickness needs to be very large. In order to meet the requirements of vacuum space and threaded structure, the outer cavity pipe needs to be further enlarged. In the actual design process, it is difficult to achieve the size requirements.

[0005] In addition, many other types of thermal insulation sleeves employ a design using multiple layers of wound or coated thermal insulation materials. Patents such as CN1076459C, CN217951674U, and CN108749188A all utilize similar structures, such as adding a reflective layer, wound layer, heat-insulating layer, and insulation layer between the inner and outer sleeves. However, these structures are suitable for lower temperatures or when the inner tube has relatively low rigidity. In these cases, the fit between the wound layer and the inner tube is relatively good, and cracking or delamination is less likely after thermal expansion. However, in chemical equipment, the media experiences severe corrosion, erosion, and wear. Therefore, the inner tube usually needs to be thicker and have sufficient rigidity. In such cases, the wound layer is prone to detachment or delamination after thermal expansion.

[0006] In addition, there are heat insulation sleeves with flexible connection structures, such as CN109340475A. The sleeve adopts a variable flexible structure, which effectively solves the problem of the integrity of the lining layer and the sleeve. However, this structure cannot meet the requirements when the pressure is high or when greater rigidity is required. Utility Model Content

[0007] The purpose of this invention is to provide a sliding segmented heat insulation sleeve to at least partially solve the above-mentioned problems of the prior art.

[0008] To achieve the above objectives, this utility model provides a sliding segmented heat insulation sleeve, comprising: a bottom sealing cone 1, a large-diameter sleeve 2, a small-diameter sleeve 3, a top sealing cone 4, a stiffening plate 5, and a heat insulation layer 6. Among them, the bottom sealing cone (1) is a tapered tube structure with a small upper diameter and a large lower diameter. The upper diameter of the bottom sealing cone (1) matches the diameter of the large diameter sleeve (2). The upper end of the bottom sealing cone (1) is fixedly connected to the large diameter sleeve (2). The top sealing cone (4) is a tapered tube structure with a large upper diameter and a small lower diameter. The upper diameter of the top sealing cone (4) matches the diameter of the small diameter sleeve (3). The lower end of the top sealing cone (4) is fixedly connected to the small diameter sleeve (3). Among them, stiffening plates (5) are evenly arranged on the inner wall of the lower end equipment pipe at the bottom of the heat insulation sleeve to support the bottom sealing cone (1), and the bottom sealing cone (1) is fixedly connected to the stiffening plates (5). Among them, the heat insulation layer (6) is made of heat insulation material and is set on the bottom sealing cone (1), the large diameter sleeve (2), the small diameter sleeve (3), and the top sealing cone (4). It is a continuous isolation structure attached to the surface of the bottom sealing cone (1), the large diameter sleeve (2), the small diameter sleeve (3), and the top sealing cone (4).

[0009] According to some embodiments, the lower end of the bottom sealing cone 1 contacts the inner wall of the lower equipment pipe, and the bottom sealing cone 1 and the large-diameter sleeve 2 are laterally supported.

[0010] According to some embodiments, the rigidity of the bottom sealing cone (1) is less than that of the large-diameter sleeve (2).

[0011] According to some embodiments, the top sealing cone (4) has the same included angle as the upper device conical head, and the upper end bore diameter of the top sealing cone (4) is larger than the bore diameter of the upper device conical head.

[0012] According to some embodiments, the large-diameter sleeve 2 has an inner chamfer, and the small-diameter sleeve 3 has an outer chamfer.

[0013] According to some embodiments, the insertion position of the large-diameter sleeve 2 and the small-diameter sleeve 3 is the bottom end of the upper equipment connector, and the bottom end of the upper equipment connector is located outside the large-diameter sleeve (2) and the small-diameter sleeve (3).

[0014] According to some embodiments, four reinforcing plates 5 are evenly arranged on the inner wall of the lower end equipment pipe at the bottom of the heat insulation sleeve to support the bottom sealing cone 1.

[0015] According to some embodiments, the heat insulation layer (6) is coated on the inner walls of the bottom sealing cone (1), the large diameter sleeve (2), the small diameter sleeve (3), and the top sealing cone (4).

[0016] According to some embodiments, the heat insulation layer (6) is provided on the outer surface of the bottom sealing cone (1), the large diameter sleeve (2), the small diameter sleeve (3), and the top sealing cone (4).

[0017] Compared with the prior art, the present invention has at least the following advantages: The present invention optimizes the design of the bottom sealing cone (1), the large-diameter sleeve (2), the small-diameter sleeve (3), and the top sealing cone (4), adds a heat insulation layer (6), adds vertically placed stiffeners (5), and simplifies the connection structure of the two sleeves, making the size design of the heat insulation sleeve more flexible, expanding the application range of the heat insulation sleeve, and reducing the production cost. The design of the two sleeves being inserted together, which allows for relative sliding during thermal expansion, can reduce the risk of the heat insulation layer falling off or breaking. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of the upper end device, the middle connecting section pipe and the connection between the heat insulation sleeve and the lower end device of a sliding segmented heat insulation sleeve provided in an embodiment of the present utility model. Figure 2 is a structural schematic diagram of a sliding segmented heat insulation sleeve provided by this utility model; Figure 3 is a schematic diagram of the structure of the top sealing cone 4 of a sliding segmented heat insulation sleeve and the upper end conical head of the equipment provided in an embodiment of the present invention. Figure 4 is a schematic diagram of the fit between the large-diameter sleeve 2 and the small-diameter sleeve 3 of a sliding segmented heat insulation sleeve provided in an embodiment of the present invention, as well as the chamfer structure. In the diagram: 1. Bottom sealing cone; 2. Large-diameter sleeve; 3. Small-diameter sleeve; 4. Top sealing cone; 5. Rib plate; 6. Insulation layer. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate to understand the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a product or device comprising a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such product or device.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments. Example 1

[0025] like Figure 1 , Figure 2 As shown, a sliding segmented thermal insulation sleeve includes: a bottom sealing cone 1, a large-diameter sleeve 2, a small-diameter sleeve 3, a top sealing cone 4, a stiffening plate 5, and a thermal insulation layer 6. like Figure 4 As shown, the large-diameter sleeve 2 is at the bottom and the small-diameter sleeve 3 is at the top. The two are connected by a plug-in method. When the large-diameter sleeve 2 and the small-diameter sleeve 3 undergo thermal expansion, they can slide relative to each other. Since the distance between the upper and lower equipment is relatively long, and the sleeve needs to extend into the pipe of the lower equipment, the overall length of the sleeve is relatively large. In addition, considering that the pipe part of the middle connection section between the upper and lower equipment needs to be cut on site and welded to the bottom of the lower equipment and the top of the pipe of the upper equipment respectively, the two-section structure can greatly facilitate on-site installation.

[0026] Among them, the bottom sealing cone (1) is a tapered tube structure with a small upper diameter and a large lower diameter. The upper diameter of the bottom sealing cone (1) matches the diameter of the large diameter sleeve (2). The upper end of the bottom sealing cone (1) is fixedly connected to the large diameter sleeve (2). The top sealing cone (4) is a tapered tube structure with a large upper diameter and a small lower diameter. The upper diameter of the top sealing cone (4) matches the diameter of the small diameter sleeve (3). The lower end of the top sealing cone (4) is fixedly connected to the small diameter sleeve (3). Matching the diameter and the pipe diameter means that the two are the same or close in size, which can realize the fixed connection between the upper end of the bottom sealing cone (1) and the large diameter sleeve (2). The fixed connection can be welding or screw connection. During the material falling process, the diameter of the sleeve changes from small to large, which can prevent the material from piling up and blocking.

[0027] Among them, stiffening plates 5 are evenly arranged on the inner wall of the lower end equipment pipe at the bottom of the heat insulation sleeve to support the bottom sealing cone 1, and the bottom sealing cone 1 is fixedly connected to the stiffening plates 5; the stiffening plates 5 can also be manufactured as a component with the bottom sealing cone 1 and fixedly connected to the inner wall of the lower end equipment pipe; the fixed connection can be welding or screw connection.

[0028] During equipment operation, high-temperature hot gas overflows from the top of the lower part of the equipment, enters through the bottom sealing cone 1, flows through the large-diameter sleeve 2, and then through the small-diameter sleeve 3. As the high-temperature gas overflows upwards, it continuously exchanges heat with the cold material falling downwards. Simultaneously, the amount of high-temperature gas overflowing decreases with increasing height. When the insulation sleeve is heated, because the small-diameter sleeve 3 and the top sealing cone 4 are fixedly connected at the upper end, both expand downwards. The small-diameter sleeve 3 extends downwards at the insertion point with the large-diameter sleeve 2 at the lower end. The large-diameter sleeve 2 and the bottom sealing cone 1 are fixed at the bottom, so both expand upwards, deforming at the insertion point. This reduces the mutual tearing between the large-diameter sleeve 2 and the insulation layer 6, effectively preventing the insulation layer 6 from detaching or breaking. When the high-temperature gas overflows upwards, the bottom sealing cone 1 effectively blocks the hot gas from entering the outer cavity of the sleeve, ensuring that the overflowing high-temperature gas can only flow upwards from inside the insulation sleeve. Meanwhile, a very small gap is left between the large end of the bottom sealing cone and the lower equipment housing nozzle. The open design of the large end of the cone structure helps to prevent hot air from directly entering the outer cavity of the casing. To prevent the large-diameter casing 2 from falling off the bottom sealing cone 1, a reinforcing plate 5 is welded at the lower end to support the bottom sealing cone 1 and prevent it from falling off, thus increasing the safety of the equipment.

[0029] Among them, the heat insulation layer 6 is made of heat insulation material and is set on the bottom sealing cone 1, the large diameter sleeve 2, the small diameter sleeve 3, and the top sealing cone 4. It is a continuous isolation structure attached to the surface of the bottom sealing cone 1, the large diameter sleeve 2, the small diameter sleeve 3, and the top sealing cone 4.

[0030] The hot gas flow path between the lower and upper equipment connected by the heat insulation sleeve is as follows: the high-temperature gas of about 500°C overflowing from the lower equipment is conducted upward from the bottom large-diameter sleeve 2 to the small-diameter sleeve 3, and finally continues to rise to the upper equipment. As the gas rises, the flow rate of the high-temperature overflowing gas decreases. At the same time, the cold pellet medium stored in the upper equipment at a temperature of about 100°C falls down and conducts heat transfer with the high-temperature gas. In order to control the heat from spreading outward to the pipe joint between the upper and lower equipment, the heat insulation layer (6) is filled on the surface of the heat insulation sleeve to prevent the hot gas from directly conducting the temperature to the outer wall of the equipment.

[0031] Preferred, such as Figure 2 As shown, the lower end of the bottom sealing cone 1 contacts the inner wall of the lower equipment connector, providing lateral support to the bottom sealing cone 1 and the large-diameter sleeve 2. When the lower sleeve tilts or bends, the large end of the bottom sealing cone 1 contacts the inner wall of the lower equipment connector, providing lateral support and preventing the insulation sleeve from tilting excessively, thereby avoiding material from entering obliquely and scouring the inner wall of the casing.

[0032] Preferred, such as Figure 2As shown, the rigidity of the bottom sealing cone (1) is less than that of the large-diameter sleeve (2). Since the bottom sealing cone 1 adopts an open design, it is less affected by corrosion and erosion. Therefore, the rigidity of the bottom sealing cone 1 can be less than that of the large-diameter sleeve (2). Thus, the bottom sealing cone 1 has a certain degree of flexibility relative to the large-diameter sleeve 2. After the bottom sealing cone 1 is fixedly connected and installed with the large-diameter sleeve 2, when the equipment heats up and generates high-temperature deformation, the heat insulation layer 6 and the large-diameter sleeve 2 generate a large friction force. The bottom sealing cone 1 can generate a certain deformation to reduce and control the excessive friction force, so as to avoid the heat insulation layer 6 from breaking or delaminating.

[0033] Preferred, such as Figure 2 , Figure 3 As shown, the top sealing cone 4 and the upper conical head of the equipment have the same included angle. The upper end diameter of the top sealing cone 4 is larger than the upper conical head diameter, causing the top sealing cone 4 to suspend from the upper conical head. The connection is made by welding. The welded connection increases the strength of the connection and prevents the insulation sleeve from deflecting and affecting its verticality. The larger end diameter of the top sealing cone 4 is larger than the connection point of the conical head, thus effectively preventing the insulation sleeve from falling.

[0034] Preferred, such as Figure 4 As shown, the large-diameter sleeve 2 has an inner chamfer, and the small-diameter sleeve 3 has an outer chamfer, which facilitates the insertion and installation of the two. The size of the chamfer angle does not affect the realization of the convenient insertion function.

[0035] Preferred, such as Figure 2 As shown, the insertion position of the large-diameter sleeve 2 and the small-diameter sleeve 3 is at the bottom end of the upper equipment pipe. During installation, after the upper and lower equipment are hoisted into place, the pipe of the intermediate connecting section can be cut on site according to actual needs. The pipe can be inserted from the middle, and the bottom end of the upper equipment pipe and the top end of the lower equipment pipe are welded together at both ends. The heat insulation sleeve is independent of the equipment body and the connecting pipe, and the two do not interfere with each other. The large-diameter sleeve 2 and the bottom sealing cone 1 can be welded at the manufacturing plant. After the intermediate connecting section pipe is welded on the construction site, the combined component of the large-diameter sleeve 2 and the bottom sealing cone 1 is inserted and installed from bottom to top inside the lower equipment. Then, the bottom sealing cone 1, the inner wall of the lower equipment pipe, and the evenly arranged stiffening plates 5 are welded and fixed. Because the welding space at the bottom of the bottom sealing cone 1 is large, the vertical stiffening plates 5 are small in volume and require little welding, and the welding space is large, the on-site construction workload is greatly reduced, which facilitates on-site construction.

[0036] Preferably, the aforementioned fixed connection is welded, which has high rigidity and good integrity, while also easily ensuring airtightness and watertightness.

[0037] Preferably, four reinforcing ribs 5 are evenly arranged on the inner wall of the lower end equipment pipe at the bottom of the heat insulation sleeve to support the bottom sealing cone 1.

[0038] Preferably, the heat insulation layer 6 is a heat insulation layer coated on the inner wall of the bottom sealing cone 1, the large-diameter sleeve 2, the small-diameter sleeve 3, and the top sealing cone 4. The heat insulation layer can be a high-temperature ceramic coating with a thickness of 0.5-2mm. The high-temperature ceramic coating has excellent high-temperature resistance, effectively preventing overheating of the inner wall in high-temperature gas environments and extending its service life. Furthermore, the high-temperature ceramic coating also has good wear resistance and corrosion resistance, enabling it to adapt to complex gas environments under high-temperature and high-pressure conditions, ensuring stable performance of the heat insulation sleeve during long-term operation.

[0039] Preferably, the heat insulation layer 6 is provided on the outer surface of the bottom sealing cone 1, the large-diameter sleeve 2, the small-diameter sleeve 3, and the top sealing cone 4. The heat insulation layer can be wrapped with a magnesium silicate fiber blanket. The outer diameter of the magnesium silicate fiber blanket is the same as the inner diameter of the equipment pipe, so that the magnesium silicate fiber blanket can completely fill the outer cavity space and effectively prevent the hot air from directly conducting the temperature to the outer wall of the equipment. Example 2

[0040] like Figure 1 As shown, the sliding segmented heat insulation sleeve includes a bottom sealing cone 1 and a large-diameter sleeve 2 connected by welding. The upper end of the large-diameter sleeve 2 is connected to the lower end of the small-diameter sleeve 3 by insertion. The small-diameter sleeve 3 is welded to the top sealing cone 4. The stiffening plate 5 provides support at the bottom, and the heat insulation layer 6 provides heat insulation on the outside.

[0041] The manufacturing and installation sequence is as follows: the top sealing cone 4 is manufactured by rolling and welding steel plates; the bottom end of the small-diameter sleeve 3 is cut with a 45% external chamfer; then the top end of the small-diameter sleeve 3 is aligned with the top sealing cone 4 and welded; after welding, a magnesium silicate fiber blanket is wrapped around the bottom of the small-diameter sleeve 3 at least 100mm away from the outside. The outer diameter of the magnesium silicate fiber blanket is the same as the inner diameter of the equipment connecting pipe, so that the magnesium silicate fiber blanket can completely fill the outer cavity space. After winding, it is placed at the outlet of the conical head of the upper equipment. Since the maximum diameter of the large end of the top sealing cone 4 is larger than the diameter of the head, the small-diameter sleeve 3 and the top sealing cone 4 can be suspended at the head of the upper equipment. At this time, the verticality can be adjusted. After meeting the requirements, the large end of the top sealing cone 4 is welded and fixed at the connection between it and the conical head of the upper equipment. The small-diameter sleeve 3 and the top sealing cone 4 are transported and installed together with the upper equipment. The top of the large-diameter sleeve 2 is cut with a 45% inner chamfer. Then, the bottom end is adjusted for coaxiality with the bottom sealing cone 1 and welded together. Magnesium silicate fiber blankets are wrapped around the top 100mm below the large-diameter sleeve 2. The outer diameter of the magnesium silicate fiber blankets is the same as the inner diameter of the equipment connecting pipe. These assembled components, along with the stiffening plate 5, are kept as spare parts. After the upper and lower equipment are hoisted into place, a connecting pipe for the intermediate section is welded between the two pieces of equipment, according to the actual site space. After the upper and lower equipment are installed as a whole through the connecting pipe for the intermediate section, the large-diameter sleeve 2 and the bottom sealing cone 1 are installed from bottom to top from the bottom of the lower equipment connecting pipe. After the large-diameter sleeve 2 and the small-diameter sleeve 3 are connected by insertion, the stiffening plate 5 is fixedly welded to the lower equipment and the bottom sealing cone 1 respectively.

[0042] During equipment operation, high-temperature hot gas overflows from the top of the lower equipment, enters through the bottom sealing cone 1, flows through the large-diameter sleeve 2, and then through the small-diameter sleeve 3. As the high-temperature gas overflows upwards, it continuously exchanges heat with the cold material falling downwards. Simultaneously, the amount of high-temperature gas overflowing decreases with increasing height. When the insulation sleeve is heated, because the small-diameter sleeve 3 and the top sealing cone 4 are welded together at the upper end, both expand downwards. The small-diameter sleeve 3 extends downwards at the joint with the large-diameter sleeve 2 at the lower end. The large-diameter sleeve 2 and the bottom sealing cone 1 are fixed at the bottom, so both expand upwards. During this upward expansion, the large-diameter sleeve 2 is compressed by the insulation layer 6. At this time, the bottom sealing cone 1 can undergo appropriate compression deformation, reducing the mutual tearing between the large-diameter sleeve 2 and the insulation layer 6, effectively preventing the insulation layer from detaching or breaking. Example 3

[0043] This embodiment provides a sliding segmented heat insulation sleeve, which includes a bottom sealing cone 1 and a large-diameter sleeve 2 connected by welding. The upper end of the large-diameter sleeve 2 is connected to the lower end of the small-diameter sleeve 3 by insertion. The small-diameter sleeve 3 is welded to the top sealing cone 4. The stiffening plate 5 provides support at the bottom, and the heat insulation layer 6 provides heat insulation on the outside.

[0044] The manufacturing and installation sequence is as follows: The top sealing cone 4 is manufactured by rolling and welding steel plates. A 60% chamfer is cut at the bottom of the small-diameter sleeve 3. Then, the top of the small-diameter sleeve 3 is aligned with the top sealing cone 4 and welded together. After welding, a high-temperature ceramic coating with a thickness of 0.5-2mm is applied to the inner walls of the top sealing cone 4 and the small-diameter sleeve 3. After coating, it is placed at the outlet of the conical head of the upper equipment. Since the maximum diameter of the large end of the top sealing cone 4 is larger than the diameter of the head, the small-diameter sleeve 3 and the top sealing cone 4 can be suspended at the head of the upper equipment. At this point, the verticality can be adjusted. Once the requirements are met, the large end of the top sealing cone 4 is welded and fixed at the connection point between it and the conical head of the upper equipment. The small-diameter sleeve 3 and the top sealing cone 4 are transported and installed together with the upper equipment. The top of the large-diameter sleeve 2 is cut with a 60% inner chamfer. Then, the bottom end is adjusted to be coaxial with the bottom sealing cone 1 and welded together. Then, the inner walls of the bottom sealing cone (1) and the large-diameter sleeve (2) are coated with a high-temperature ceramic coating with a thickness of 0.5-2mm. The above-mentioned combined components and stiffener 5 are used as spare parts. After the upper and lower end equipment is hoisted into place, the connecting pipe of the intermediate section is welded between the two equipment according to the actual space on site. After the upper and lower end equipment is installed as a whole through the connecting pipe, the large-diameter sleeve 2 and the bottom sealing cone 1 are installed from the bottom of the lower end equipment connecting pipe from bottom to top. After the large-diameter sleeve 2 and the small-diameter sleeve 3 are connected by plug-in, the stiffener 5 is fixedly welded to the lower end equipment and the bottom sealing cone 1 respectively.

[0045] During equipment operation, high-temperature hot gas overflows from the top of the lower equipment, enters through the bottom sealing cone 1, flows through the large-diameter sleeve 2, and then through the small-diameter sleeve 3. As the high-temperature gas overflows upwards, it continuously exchanges heat with the cold material falling downwards. Simultaneously, the amount of high-temperature gas overflowing decreases with increasing height. When the insulation sleeve is heated, because the small-diameter sleeve 3 and the top sealing cone 4 are welded together at the upper end, both expand downwards. The small-diameter sleeve 3 extends downwards at the joint with the large-diameter sleeve 2 at the lower end. The large-diameter sleeve 2 and the bottom sealing cone 1 are fixed at the bottom, so both expand upwards. During this upward expansion, the large-diameter sleeve 2 is compressed by the insulation layer 6. At this time, the bottom sealing cone 1 can undergo appropriate compression deformation, reducing the mutual tearing between the large-diameter sleeve 2 and the insulation layer 6, effectively preventing the insulation layer from detaching or breaking.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

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