A smoking acid pipeline heat preservation connecting structure

Abstract

The application provides a smoking acid pipeline heat preservation connecting structure, and belongs to the technical field of pipeline heat preservation connection. The smoking acid pipeline heat preservation connecting structure comprises heat preservation units and connecting units which are connected alternately. The heat preservation unit is composed of two opposite prefabricated modules which are wrapped outside the conveying pipeline. The heat preservation unit is spliced by two opposite prefabricated modules, and is connected by the connecting unit to form an integrated sealing heat preservation system with hot water circulation heat tracing. The opposite prefabricated modules are automatically pulled tight in the opposite surface by wedge-shaped cooperation of the limiting head and the limiting seat in the axial reverse movement mode. During the locking process of the locking ring of the butt joint end and the annular butt joint, the close opposite of the prefabricated module and the locking are automatically completed, and the sealing connection of the heat preservation unit and the connecting unit is also completed. The overall structure system is not only simple in installation process and convenient to install, but also effectively improves the heat preservation effect and the stability of long-term operation of the system, and is convenient for later maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline heat preservation connection, in particular to a fuming acid pipeline heat preservation connection structure. BACKGROUND

[0002] In the chemical industry and other industries, in order to prevent high-concentration sulfuric acid (such as 105% fuming acid with a crystallization temperature of 16℃, 98% sulfuric acid with a crystallization temperature of 3℃) from crystallizing and blocking the conveying pipeline during the conveying process, it is usually necessary to set a heat preservation structure with a heat tracing system along the pipeline. Common heat tracing methods include electric heat tracing, steam heat tracing, and hot water circulation heat tracing.

[0003] Among them, the electric heat tracing system occupies the mainstream position due to its simple structure, flexible laying, and good comprehensive economy, followed by the steam heat tracing system. Although the hot water circulation heat tracing system has relatively limited application in conventional scenarios, it has unique advantages in specific working conditions such as high temperature uniformity requirements, strict explosion safety levels, or availability of low-level waste heat from the factory. This system uses liquid water as a stable heat transfer medium and achieves convective heat transfer through circulation, which can achieve accurate and uniform temperature control of the entire pipeline and has intrinsic safety characteristics, effectively making up for the technical deficiencies of steam heat tracing (which has problems such as large temperature control fluctuations and low energy efficiency) and electric heat tracing (which has limitations such as insufficient temperature uniformity and potential electric spark gas risk).

[0004] Currently, the heat preservation structure using hot water circulation heat tracing usually needs to lay a heat tracing pipeline along the conveying pipeline during construction and weld or connect it into a continuous rigid loop; then lay the heat preservation layer. The heat preservation layer is generally covered with flexible heat preservation materials as a whole, or the heat tracing pipeline and the conveying pipeline are wrapped together using a complete heat preservation pipe shell (such as rock wool, glass wool, etc.), and steel wire or other materials are used for tightening and fixing during wrapping; finally, a metal protective layer (such as galvanized iron sheet, aluminum sheet, etc.) is installed outside the heat preservation layer to achieve waterproofing, moisture-proofing, and mechanical protection.

[0005] However, the construction process of the above structure system is complex, and the integration level of the overall structure is low, which restricts the heat preservation effect and the stability of long-term operation. Moreover, it is difficult to maintain and repair the system later, and the convenience is low. In addition, in the existing process, the maintenance of the conveying pipeline usually accompanies the simultaneous shutdown of the heat tracing system, and similarly, the maintenance of the heat tracing system often leads to the interruption of the main process, otherwise, it will significantly increase the risk of crystallization of the conveying pipeline, affecting the stable operation of the main process. SUMMARY

[0006] The application provides a pipeline heat preservation connecting structure of smoking acid, which comprises heat preservation units and connecting units which are connected alternately along the pipeline path, the heat preservation unit is composed of two opposite prefabricated modules which are wrapped around the pipeline, the opposite surfaces of the two prefabricated modules are respectively provided with a limiting head and a limiting seat which are wedge-shaped matched with each other, when the two opposite prefabricated modules move reversely along the axial direction, the opposite surfaces are automatically pulled tight, the two ends of the prefabricated module are provided with a half-ring structure of a butt joint end, the connecting unit comprises a heat preservation seat, a ring-shaped butt joint and a locking ring, the heat preservation seat is provided with two communication cavities, the ring-shaped butt joint is arranged on the two sides of the heat preservation seat and is used for butt joint with the two butt joint ends on the corresponding side, so that the heat preservation unit is connected with the heat preservation seat in a sealed mode, the locking ring is used for locking the two opposite prefabricated modules, the ring-shaped butt joint comprises a butt joint ring which is provided with a ring-shaped boss on the outer circumferential surface, the ring-shaped boss is provided with two wedge-shaped limiting areas which are distributed on the opposite sides of the axial direction, the wedge-shaped limiting areas are half-ring structures, during the locking process of the opposite prefabricated modules, the two wedge-shaped limiting areas on the ring-shaped boss are wedge-shaped matched with the two butt joint ends on the corresponding side, so that the two prefabricated modules move reversely along the axial direction and the opposite surfaces are pressed tightly, the prefabricated module comprises a sealed heat preservation cover in which a heat tracing pipeline segment is arranged, the two ports of the heat tracing pipeline segment are connected with the corresponding communication cavities through valves respectively, and a closed heat tracing loop is formed.

[0007] In a possible implementation, the two prefabricated modules in the heat preservation unit are oppositely arranged, the opposite surface of the upper prefabricated module is provided with a containing groove, a plurality of limiting heads are uniformly arranged on the upper prefabricated module along the axial direction of the pipeline, and the limiting heads are arranged in the containing groove, the limiting seat comprises a connecting body which is provided with a plurality of inclined limiting grooves, the connecting body is fixedly arranged on the opposite surface of the lower prefabricated module, the inclined limiting grooves are uniformly arranged along the axial direction of the pipeline and correspond to the limiting heads one by one, the containing groove is used for containing the connecting body and limiting the connecting body in the horizontal radial direction, so that the upper and lower prefabricated modules are aligned in the radial direction.

[0008] In a possible implementation, the cross section of the connecting body is isosceles trapezoidal, and the shape of the containing groove is matched with the connecting body.

[0009] In a possible implementation, the heat preservation units and the connecting units are alternately arranged from left to right, the two ports of the heat tracing pipeline segment pass through the side surface of the sealed heat preservation cover to the outside of the sealed heat preservation cover, two external joints are connected to each communication cavity, and the external joints are arranged on the left and right sides of the heat preservation seat; the two heat tracing pipeline segments in the heat preservation unit are connected with the two communication cavities in the adjacent heat preservation seat.

[0010] In a possible implementation, the sealed heat preservation cover comprises a half-cylindrical outer cover body, the outer cover body is filled with a heat preservation layer, the heat tracing pipeline segment is embedded in the heat preservation layer, the outer cover body is connected with the outer circumferential surface of the pipeline in a sealed mode, and an independent sealed heat preservation area is formed.

[0011] In a possible implementation, the locking ring comprises two half-ring bodies provided with locking ends, and the two half-ring bodies are fastened together by locking the locking ends with fasteners.

[0012] In a possible implementation, the docking end comprises a half-ring-shaped docking body, and the inner side of the docking body is provided with a half-ring-shaped wedge surface; after the two prefabricated modules are docked, the two wedge surfaces on one of the prefabricated modules are located on one axial side of the corresponding wedge limiting area, and the two wedge surfaces on the other prefabricated module are located on the other axial side of the corresponding wedge limiting area.

[0013] In a possible implementation, after the prefabricated modules are disassembled, the flow capacity of the simulated heat tracing pipeline section is connected to the standby heat preservation pipeline.

[0014] The one or more technical solutions in the embodiments of the present application have the following technical effects: according to the heat tracing pipeline connection structure provided by the embodiments of the present application, the heat preservation unit is spliced by two docked prefabricated modules, and an integrated sealed heat preservation system with hot water circulation heat tracing is formed through the connection of the connection unit. The overall structural system not only has a simple installation process and is convenient to install, but also effectively improves the heat preservation effect and the stability of long-term operation of the system, facilitates later maintenance, and in the installation process, the docked prefabricated modules are automatically tensioned in the axial reverse movement mode through the wedge-shaped cooperation of the limiting head and the limiting seat, and the tight docking and locking of the prefabricated modules are automatically completed in the locking process of the locking ring, the sealing connection of the heat preservation unit and the connection unit is also completed, the convenience of installation of the overall structural system and the sealing performance of the integrated sealed heat preservation system are improved, and in the later maintenance process, the prefabricated modules can be disassembled individually without emptying all the hot water, and the operation of the hot water circulation heat tracing system can be maintained by connecting the standby heat preservation pipeline, thereby reducing the risk of crystallization of the conveying pipeline, and enabling the main process to operate normally during maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a partial structure diagram of the heat tracing pipeline connection structure provided by the embodiments of the present application.

[0016] Figure 2 is a partial structure diagram of the heat tracing pipeline connection structure provided by the embodiments of the present application.

[0017] Figure 3 is Figure 2 is an enlarged view of A in FIG.

[0018] Figure 4It is a kind of cover body and limiting section structure schematic diagram of the acid pipe heat preservation connecting structure provided by the embodiment of the present application.

[0019] Figure 5 It is a kind of cover body and limiting section structure schematic diagram of the acid pipe heat preservation connecting structure provided by the embodiment of the present application.

[0020] Figure 6 It is a kind of cover body and limiting section structure schematic diagram of the acid pipe heat preservation connecting structure provided by the embodiment of the present application.

[0021] Figure 7 It is a kind of cover body and limiting section structure schematic diagram of the acid pipe heat preservation connecting structure provided by the embodiment of the present application.

[0022] In the figure: 1, conveying pipeline; 2, prefabricated module; 21, sealing heat preservation cover; 211, cover body; 212, heat preservation layer; 22, heat tracing pipeline section; 3, limiting head; 4, limiting seat; 41, inclined limiting groove; 42, connecting body; 5, docking end; 51, cover body; 52, wedge surface; 6, heat preservation seat; 7, communication cavity; 8, annular docking head; 81, annular boss; 82, docking ring; 83, wedge limiting area; 9, locking ring; 91, locking end; 92, half ring body; 10, containing groove; 11, external joint. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0024] Please refer to Figure 1 and Figure 3 , a kind of acid pipe heat preservation connecting structure, including several heat preservation units and several connection units, two are sequentially distributed along the axis of conveying pipeline 1, heat preservation unit is connected by the connection of connection unit, overall form integrated sealing heat preservation system, conveying pipeline 1 is overall wrapped in, effectively improve heat preservation effect and the stability of system long-term operation. And heat preservation unit is composed of two upper and lower opposite distribution in radial prefabricated module 2 (as shown in Figure 1 ), by the design of modularization, the installation process of heat preservation sealing system is significantly simplified and the installation convenience, and each prefabricated module 2 can be individually disassembled, it is convenient to overhaul later.

[0025] Please refer to Figure 1 ,Figure 2 and Figure 7 The connecting unit comprises a heat preservation seat 6 with two communicating cavities 7, the heat preservation seat 6 is provided with a through hole for the conveying pipeline 1 to pass through, the communicating cavities 7 are semi-annular structures and are arranged oppositely and independently, the prefabricated module 2 comprises a sealed heat preservation cover 21 and a heat tracing pipeline segment 22, the left and right ends of the upper heat tracing pipeline segment 22 in the heat preservation unit are connected to the upper communicating cavities 7 in the left and right heat preservation seats 6 through valves respectively, and the left and right ends of the lower heat tracing pipeline segment 22 are connected to the lower communicating cavities 7 in the left and right heat preservation seats 6 through valves respectively, wherein, in the whole sealed heat preservation system, the two communicating cavities 7 in the rightmost heat preservation seat 6 are connected, and the two communicating cavities 7 in the leftmost heat preservation seat 6 are connected and connected with a heating circulating system (an electric heating system combined with a circulating pump, or a boiler heating combined with a circulating pump, or waste heat combined with a circulating pump), forming a circulating loop, and after hot water is supplied, a hot water circulating heat tracing system is formed. The hot water circulating heat tracing system is closed by closing the valves at both ends of the heat tracing pipeline segment 22, the hot water circulating heat tracing system is temporarily stopped, the heat tracing pipeline segment 22 in this section can be disassembled without emptying the hot water in the whole line, and then the prefabricated module 2 can be disassembled for corresponding maintenance, at the same time, an additional standby heat preservation pipeline (not shown in the figure) is connected, so that the hot water circulating heat tracing system continues to operate in a state, and the whole process does not need to stop the main process, and can significantly reduce the crystallization risk of the conveying pipeline 1. And the hot water circulating heat tracing system is temporarily stopped, the time is short and controllable, and the influence on the overall heat preservation effect is small, which can significantly reduce the crystallization risk of the conveying pipeline 1. After replacing the standby heat preservation pipeline, although the local conveying pipeline 1 loses the high-efficiency heat preservation of the prefabricated module 2, due to the continuous operation of the heat preservation system and the maintenance of the remaining part of the heat preservation state, the crystallization risk of the conveying pipeline 1 can also be significantly reduced. When the sulfuric acid conveying pipeline 1 needs to be maintained, only the corresponding prefabricated module 2 needs to be disassembled, and the standby heat preservation pipeline is connected, so that the conveying pipeline 1 can be maintained, and the hot water circulating heat tracing system remains in an operating state during the maintenance process. After the conveying pipeline 1 is completely maintained, it can enter the conveying state immediately, wherein, in order to further improve the convenience of the later maintenance, the heat preservation seat 6 can be designed as an upper and lower structure (not shown in the figure).

[0026] Referring to Figure 1 and Figure 2The sealing and heat preservation cover 21 comprises an outer cover body 211 in a semi-cylindrical structure, the outer cover body 211 is filled with a heat preservation layer 212, and the heat tracing pipeline section 22 is embedded in the heat preservation layer 212. The sealing and heat preservation cover 21 in the upper prefabricated module 2 is matched with the sealing and heat preservation cover 21 in the lower prefabricated module 2 to form a complete cylindrical sealing and heat preservation unit wrapped around the conveying pipeline 1. The left and right ends of the sealing and heat preservation unit are sealingly connected with the corresponding heat preservation seats 6, and the whole forms a sealing and heat preservation system, which efficiently heat preserves the conveying pipeline 1. It should be noted that the sealing and heat preservation system is used to sealingly and heat preserve the conveying pipeline 1 in a full-pipeline wrapping mode. For the space requirement of the flange connection of the conveying pipeline 1, only an arc-shaped accommodating area (not shown in the figure) needs to be arranged on the corresponding prefabricated module 2. Meanwhile, a visual observation port can be arranged at the bottom of the accommodating area of the lower prefabricated module 2, so as to facilitate the observation of whether the connection of the conveying pipeline 1 leaks and timely maintenance.

[0027] Referring to Figure 2 , Figure 3 and Figure 4 , the two matching surfaces of the upper outer cover body 211 are each provided with a limiting head 3, and the two matching surfaces of the lower outer cover body 211 are each provided with a limiting seat 4 (as shown in Figure 4 ). The limiting head 3 and the limiting seat 4 are wedge-shaped matched. During the matching and installation of the upper and lower prefabricated modules 2, the upper and lower prefabricated modules 2 are first preliminarily matched, so that the limiting head 3 enters the limiting area of the limiting seat 4, and then the prefabricated modules 2 are reversely moved in the axial direction, so that the matching surfaces are automatically tensioned by the wedge-shaped matching of the limiting head 3 and the limiting seat 4, and the upper and lower prefabricated modules 2 are quickly and tightly matched and spliced together.

[0028] The limiting head 3 is in a cylindrical structure, and the matching surface of the upper outer cover body 211 is provided with a containing groove 10 (as shown in Figure 3As shown), the limiting head 3 is located in the receiving groove 10. The limiting seat 4 includes a connecting body 42 with several inclined limiting grooves 41. The inclined limiting grooves 41 are inclined from left to right and from top to bottom. The left end of the inclined limiting groove 41 is provided with an upward inlet. The inlet and the inclined limiting groove 41 both pass through the connecting body 42 in the front-back direction. The connecting body 42 is fixedly installed on the mating surface of the lower outer cover 211. During the mating installation process, the limiting head 3 aligns with the inlet of the corresponding inclined limiting groove 41 and enters the inclined limiting groove 41. Then, corresponding to the lower outer cover 211, the upper outer cover 211 moves to the right. Under the limitation of the corresponding inclined limiting groove 41, the limiting head 3 automatically tightens the upper and lower outer covers 211, so that the two are tightly mated and connected together. At the same time, each outer cover 211 is tightly attached to the outer surface of the conveying pipe 1. One side forms a relatively independent heat preservation and sealing area. On the other side, based on the mating and sealing of the upper and lower outer covers 211, a secondary seal is further formed to improve the sealing and heat preservation effect.

[0029] See Figure 3 The cross-section of the connector 42 is an isosceles trapezoid, and the shape of the receiving groove 10 matches the connector 42. During the assembly and installation of the prefabricated module 2, the connector 42 limits the upper and lower outer covers 211 in the front and rear directions through the matching of the receiving groove 10 and the connector 42, which facilitates the quick and accurate assembly and installation of the upper and lower outer covers 211 together, and improves the convenience of the prefabricated module 2 installation.

[0030] See Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The outer casing 211 has semi-circular docking ends 5 on both its left and right ends (e.g., Figure 4 As shown), the docking end 5 includes a semi-annular mating body 51 and a semi-annular wedge-shaped surface 52 located inside the mating body 51 (as shown). Figure 5 (As shown). Both sides of the insulation base 6 are provided with annular connectors 8. Each annular connector 8 includes a mating ring 82 with an annular boss 81 on its outer circumferential surface. The mating ring 82 is sealed to the end face of the insulation base 6 near the end face of the insulation base 6. The annular boss 81 has two semi-annular wedge-shaped limiting areas 83, distributed vertically. The upper wedge-shaped limiting area 83 is located on the left side of the annular boss 81, and the lower wedge-shaped limiting area 83 is located on the right side of the annular boss 81 (e.g., as shown). Figure 6 As shown), the wedge-shaped limiting area 83 and the wedge-shaped surface 52 are paired one-to-one, as... Figure 7As shown, the wedge-shaped surfaces 52 at both ends of the upper outer cover 211 are located to the right of the corresponding wedge-shaped limiting areas 83, and their tilting direction is from left to right and from outside to inside. The wedge-shaped surfaces 52 at both ends of the lower outer cover 211 are located to the left of the corresponding wedge-shaped limiting areas 83, and their tilting direction is from left to right and from inside to outside. During the process of locking the upper and lower outer covers 211 from the left and right ends, the upper outer cover 211 is subjected to a rightward tilt under the limitation of the corresponding wedge-shaped surfaces 52 and the wedge-shaped limiting areas 83. Similarly, the lower outer cover 211 is pushed to the left, which causes the upper and lower outer covers 211 to fit together tightly and lock together. At the same time, the two mating ends 5 on the left side of the upper and lower outer covers 211 are sealed together with the left annular joint 8 and form a sealed connection area. The two mating ends 5 on the right side are sealed together with the right annular joint 8 and form a sealed connection area, so that the adjacent insulation seats 6 of the insulation unit are sealed together to form an integrated sealed insulation system.

[0031] See Figure 1 and Figure 5 The prefabricated modules 2 that are joined together are locked with locking rings 9. The locking rings 9 lock from both ends of the prefabricated modules 2. The locking rings 9 include two half-rings 92 with locking ends 91. The two half-rings 92 are locked and fixed by fasteners through the locking ends 91, thus fastening and locking the prefabricated modules 2 that are joined together from both ends.

[0032] See Figure 2 Each connecting cavity 7 is provided with two external connectors 11 located outside the insulation base 6. The external connectors 11 are located on the left and right sides of the insulation base 6 and are staggered front and back. The left external connector 11 is connected to the right end of the heat tracing pipe section 22 in the adjacent prefabricated module 2 on the left, and the right external connector 11 is connected to the left end of the heat tracing pipe section 22 in the adjacent prefabricated module 2 on the right. Specifically, the left external connector 11 connected to the upper connecting cavity 7 is connected to the right port of the heat tracing pipe section 22 in the upper left prefabricated module 2, and the right external connector 11 is connected to the left port of the heat tracing pipe section 22 in the upper right prefabricated module 2. Similarly, the two external connectors 11 on the lower connecting cavity 7 are located on the left and right sides of the insulation base 6, respectively. The left external connector 11 is connected to the right port of the heat tracing pipe section 22 in the upper left prefabricated module 2, and the right external connector 11 is connected to the left port of the heat tracing pipe section 22 in the upper right prefabricated module 2. Both ports of the heat tracing pipe section 22 pass through the sealing insulation cover 21 and are located outside the sealing insulation cover 21, so that the connection point between it and the connecting cavity 7 is located outside the sealing insulation system, which facilitates the maintenance of the connection point. In order to further reduce heat loss, a snap-on insulation cover (not shown in the figure) can be set separately at the connection point, or the insulation material can be directly wrapped.

[0033] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; 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; 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 according to the specific circumstances.

[0035] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A thermal insulation connection structure for fuming acid pipelines, characterized in that: It includes insulation units and connecting units that are alternately connected sequentially along the conveying pipeline path; The insulation unit consists of two prefabricated modules that fit together and cover the outside of the delivery pipeline; The two prefabricated modules within the insulation unit are arranged vertically opposite each other. A receiving groove is provided on the mating surface of the upper prefabricated module. Several limiting heads are evenly distributed on the upper prefabricated module along the axial direction of the conveying pipe, and the limiting heads are located in the receiving groove. The limiting seat includes a connecting body with several inclined limiting grooves. The connecting body is fixedly installed on the mating surface of the lower prefabricated module, and the inclined limiting grooves are evenly distributed along the axial direction of the conveying pipe and correspond one-to-one with the limiting heads. The receiving groove is used to accommodate the connecting body and limit the connecting body in the horizontal radial direction, so that the upper and lower prefabricated modules are aligned in the radial direction. The inclined limiting groove is inclined from top to bottom in the direction from left to right, and the left end of the inclined limiting groove is provided with an upward inlet. Limit heads and limit seats are respectively provided on the mating surfaces of the two prefabricated modules. When the two mating prefabricated modules move in opposite directions along the axial direction, the mating surfaces are automatically tightened. Both ends of the prefabricated module are equipped with semi-ring structure docking ends; The connection unit includes: Insulated base with two interconnected cavities; The connecting cavity has a semi-circular structure, and the two connecting cavities are distributed vertically opposite each other and are independent of each other; The annular joint is located on both sides of the insulation base and is used to connect with the two mating ends on the corresponding sides to make the insulation unit and the insulation base sealed together. Locking rings secure the mating prefabricated modules from both ends; The annular joint includes a mating ring with an annular boss on its outer circumference. The annular boss has two axially distributed wedge-shaped limiting areas, which are semi-annular in structure. The docking end includes a semi-annular mating body and a semi-annular wedge-shaped surface located inside the mating body; two semi-annular wedge-shaped limiting areas are provided on the annular boss, the two wedge-shaped limiting areas are distributed vertically, and the upper wedge-shaped limiting area is located on the left side of the annular boss, and the lower wedge-shaped limiting area is located on the right side of the annular boss. The wedge-shaped limiting areas correspond one-to-one with the wedge-shaped surfaces. The wedge-shaped surfaces at both ends of the upper prefabricated module are located on the right side of the corresponding wedge-shaped limiting areas, and the inclination direction of the two is from left to right and from outside to inside. The wedge-shaped surfaces at both ends of the lower prefabricated module are located on the left side of the corresponding wedge-shaped limiting areas, and the inclination direction of the two is from left to right and from inside to outside. During the locking process of the mating prefabricated modules, the two wedge-shaped limiting areas on the annular boss cooperate with the two wedge-shaped mating ends on the corresponding sides, causing the two prefabricated modules to move in opposite directions along the axial direction and press the mating surfaces together. The prefabricated module includes a sealed insulation cover with a built-in heat tracing pipe section. The two ports of the heat tracing pipe section are connected to the corresponding connecting cavity through valves to form a closed heat tracing circuit.

2. The thermal insulation connection structure for a fuming acid pipeline according to claim 1, characterized in that: The cross-section of the connector is an isosceles trapezoid, and the shape of the receiving groove matches the connector.

3. The thermal insulation connection structure for a fuming acid pipeline according to claim 1, characterized in that: The insulation unit and the connecting unit are alternately distributed from left to right. The two ports of the heat tracing pipe section pass through the side of the sealing insulation cover to the outside of the sealing insulation cover. Each connecting cavity is connected to two external connectors, which are located on the left and right sides of the insulation base respectively. The two heat tracing pipe sections in the insulation unit are respectively connected to the corresponding connecting cavities in the adjacent insulation base.

4. The thermal insulation connection structure for a fuming acid pipeline according to any one of claims 1-3, characterized in that: The sealed heat insulation cover includes an outer cover with a semi-cylindrical structure, the outer cover is filled with a heat insulation layer, the heat tracing pipe section is embedded in the heat insulation layer, and the outer cover is sealed to the outer circumference of the conveying pipe to form an independent sealed heat insulation zone.

5. The thermal insulation connection structure for a fuming acid pipeline according to claim 1, characterized in that: The locking ring includes two semi-rings with locking ends. The two semi-rings are fastened together by fasteners that lock the locking ends.

6. The thermal insulation connection structure for a fuming acid pipeline according to claim 1, characterized in that: After the prefabricated module is disassembled, the flow rate of the simulated heat tracing pipeline section is connected to the backup insulation pipeline.

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