A kind of reforming device for preventing circulating fluidized bed boiler slag cooler under slag pipe water cooling jacket expansion restriction

Abstract

This invention relates to a modification device for preventing the expansion limitation of the water-cooled jacket of the slag cooler's slag pipe in a circulating fluidized bed boiler. The device includes a slag discharge pipe body, an outlet water-cooled wall pipe for the slag cooler's slag pipe water-cooled jacket located outside the slag discharge pipe body, and a bottom water-cooled wall pipe for the water-cooled air chamber located outside the outlet water-cooled wall pipe. This modification device, through a basic expansion release assembly consisting of the outlet water-cooled wall pipe, the bottom water-cooled wall pipe of the water-cooled air chamber, and the original connecting fins, removes 800mm of the original connecting fins to create a reserved expansion gap. This ensures that the thermal expansion of the outlet water-cooled wall pipe is not less than 20mm without structural interference, completely releasing thermal expansion stress and fundamentally preventing the outlet pipe from tearing and bursting. This significantly reduces the probability of unplanned boiler unit shutdowns and improves operational safety.

Description

Technical Field

[0001] This invention relates to the field of boiler thermal expansion parameter design technology, specifically to a modification device for preventing the expansion of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler from being restricted. Background Technology

[0002] The existing slag cooler ash lower tube water-cooled jacket outlet water-cooled wall tube of the fluidized bed boiler has a structural defect in the factory design stage: the original design used fins to completely seal and weld the slag cooler ash lower tube water-cooled jacket outlet water-cooled wall tube to the bottom water-cooled wall tube of the water-cooled air chamber. This structure causes the slag cooler ash lower tube to be unable to expand freely after being heated during unit startup. The thermal expansion stress is directly applied to the water-cooled wall outlet tube, making the outlet tube tearing and bursting accident easy to occur during boiler ignition.

[0003] In practical applications, this part has experienced multiple water-cooled wall tube rupture failures in the early stages of unit operation, causing unplanned unit shutdowns. This not only seriously affects the safety and stability of boiler operation, but also causes significant economic losses and reduced operating efficiency. Currently, there is a lack of targeted modification technology solutions in the industry. There is an urgent need to develop a technical solution that can both release the expansion margin of the slag tube in the slag cooler and effectively avoid air leakage problems, so as to solve the pain points of the existing technology. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a modification device for preventing the water-cooled jacket of the slag cooler lower tube in a circulating fluidized bed boiler from expanding unrestricted. This device allows for the free expansion of the slag cooler lower tube while ensuring long-term stable sealing performance and real-time measurability of equipment status to ensure long-term safe and stable operation of the unit. It solves the problem of a series of operational failures caused by the expansion restriction of the slag cooler lower tube in existing boilers.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a modification device for preventing the expansion limitation of the water-cooled jacket of the slag cooler lower tube in a circulating fluidized bed boiler, comprising a slag discharge pipe body, an outlet water-cooled wall pipe of the slag cooler lower tube water-cooled jacket provided on the outside of the slag discharge pipe body, a bottom water-cooled wall pipe of the water-cooled air chamber provided on the outside of the outlet water-cooled wall pipe of the slag cooler lower tube water-cooled jacket, original connecting fins provided on the outside of the outlet water-cooled wall pipe of the slag cooler lower tube water-cooled jacket, and an adaptive sealing compensation component provided on the outside of the outlet water-cooled wall pipe of the slag cooler lower tube water-cooled jacket.

[0006] Furthermore, the water-cooled wall tube at the outlet of the slag cooler's lower slag tube, the water-cooled wall tube at the bottom of the water-cooled air chamber, and the original connecting fins constitute a basic expansion release assembly. A reserved expansion gap is provided between the water-cooled wall tube at the outlet of the slag cooler's lower slag tube and the water-cooled wall tube at the bottom of the water-cooled air chamber, which is formed by cutting off the original connecting fins. The water-cooled wall tube at the outlet of the slag cooler's lower slag tube and the water-cooled wall tube at the bottom of the water-cooled air chamber are movably connected through the reserved expansion gap. A fully welded sealing area is provided on the outside of the water-cooled wall tube at the outlet of the slag cooler's lower slag tube. The adaptive sealing compensation assembly is located below the connection area between the water-cooled wall tube at the outlet of the slag cooler's lower slag tube and the water-cooled wall tube at the bottom of the water-cooled air chamber. A thermal expansion dynamic monitoring assembly is provided on the outside of the water-cooled wall tube at the outlet of the slag cooler's lower slag tube. The thermal expansion dynamic monitoring assembly is arranged outside the reserved expansion gap and the sealing compensation assembly.

[0007] Furthermore, the length of the original connecting fins to be cut is 800mm, and the cutting range covers the symmetrical areas on both sides of the outlet water-cooled wall tube of the slag cooler's lower slag tube. After the original connecting fins are cut, the cut surface is ground with an arc radius of R≥5mm and sprayed with a high-temperature resistant and corrosion-resistant coating with a temperature resistance of not less than 800℃.

[0008] Furthermore, the adaptive sealing compensation component is a U-shaped groove elastic sealing box. The groove size is adapted to the outer diameter of the water-cooled wall tube at the outlet of the slag cooler's slag lower pipe and the spacing between the water-cooled wall tubes at the bottom of the water-cooled air chamber. The U-shaped groove elastic sealing box is provided with a high-temperature resistant flexible sealing pad on the inner side, and a detachable high-temperature resistant sealing plate is installed at the end. A high-temperature resistant anti-corrosion protective sleeve is added to the weld joint. The whole has a deformation adjustment capability of ±5mm.

[0009] Furthermore, the U-shaped groove elastic sealing box is made of high-temperature resistant alloy material, with the material model being 12Cr1MoVG or a metal material with equivalent high-temperature resistant properties. The high-temperature resistant flexible sealing gasket layer is a composite material of ceramic fiber and high-temperature resistant rubber, with a temperature resistance of not less than 1000℃. The detachable high-temperature resistant edge sealing plate is made of the same material as the sealing box.

[0010] Furthermore, the top edge of the U-shaped groove elastic sealing box is fixed by continuous welding at the contact position with the water-cooled wall tube at the outlet of the slag cooler's slag pipe and the contact position with the bottom water-cooled wall tube of the water-cooled air chamber. The welding uses heat-resistant elastic welding material, the weld height is not less than 3mm, and there are no defects such as pores, slag inclusions, or incomplete penetration. After welding, a high-temperature resistant and corrosion-resistant protective sleeve is installed on the weld.

[0011] Furthermore, the thermal expansion dynamic monitoring component includes a miniature displacement sensor, a temperature sensor, a data acquisition terminal, and a high-temperature resistant stainless steel protective cover. There are two miniature displacement sensors, which are symmetrically arranged on the water-cooled wall tubes at the bottom of the water-cooled air chamber on both sides of the reserved expansion gap. There are three temperature sensors, which are arranged on the top and both sides of the U-shaped groove elastic sealing box. Each sensor is equipped with a high-temperature resistant stainless steel protective cover on its outer side.

[0012] Furthermore, the thermal expansion of the outlet water-cooled wall tube of the slag cooler's slag lower pipe within the reserved expansion gap range is not less than 20mm, and there is no structural interference during the expansion process. The U-shaped groove elastic sealing box adapts to slight displacement of the pipe body and its sealing performance is not affected.

[0013] Furthermore, the miniature displacement sensor is a laser non-contact sensor with a measurement accuracy of ±0.1mm, the temperature sensor is a sheathed thermocouple sensor with a temperature resistance of not less than 1200℃, and the data acquisition terminal has preset expansion and temperature thresholds, and has on-site audible and visual alarms and remote data upload and early warning functions linked with the boiler central control system. Beneficial effects

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler in a circulating fluidized bed boiler is based on an expansion release component consisting of the water-cooled wall tube at the outlet of the slag cooler's ...

[0015] 2. This device, used to prevent the expansion limitation of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler, features an adaptive sealing compensation component that is a U-shaped groove elastic sealing box. It is adapted to the connection dimensions of the water-cooled wall tube at the outlet of the slag cooler tube water-cooled jacket and the water-cooled wall tube at the bottom of the water-cooled air chamber. It has a deformation adjustment capability of ±5mm and can adaptively deform with slight displacement of the tube. Combined with the miniature displacement sensor and temperature sensor of the thermal expansion dynamic monitoring component, it realizes real-time monitoring of equipment status and dual early warning. It not only eliminates hot air leakage problems and ensures boiler thermal efficiency, but also promptly detects potential faults and realizes intelligent operation and control of the boiler. Moreover, the overall modification does not require any changes to the main structure of the boiler, making construction convenient and highly versatile. Attached Figure Description

[0016] Figure 1This is a top view schematic diagram of the water-cooled jacket connection of the slag lower pipe of the modified slag cooler according to the present invention. Figure 2 This is a side view of the installation of the inlet and outlet water-cooled wall tubes of the slag cooler water-cooling jacket of the present invention and the direction of medium flow. Figure 3 This is a top view schematic diagram comparing the connection between the water-cooled jacket and the water-cooled wall tube of the slag lower pipe of the slag cooler before and after the modification of this invention; Figure 4 This is a branch diagram of the present invention.

[0017] In the diagram: 1. Main body of the slag discharge pipe; 2. Water-cooled wall pipe at the outlet of the slag cooler's slag discharge pipe; 3. Water-cooled wall pipe at the bottom of the water-cooled air chamber; 4. Existing connecting fins; 5. Adaptive sealing compensation component; 6. Reserved expansion gap; 7. Fully welded sealing area. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-4 A modification device for preventing the expansion limitation of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler includes a slag discharge tube body 1, a water-cooled wall tube 2 for the outlet of the water-cooled jacket of the slag cooler tube is provided outside the slag discharge tube body 1, a water-cooled wall tube 3 for the bottom of the water-cooled air chamber is provided outside the water-cooled wall tube 2 for the outlet of the water-cooled jacket of the slag cooler tube is provided outside the slag discharge tube is provided outside the original connecting fins 4, and an adaptive sealing compensation component 5 is provided outside the water-cooled wall tube 2 for the outlet of the water-cooled jacket of the slag cooler tube.

[0020] Furthermore, the basic expansion release assembly is composed of the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag cooler, the water-cooled wall tube 3 at the bottom of the water-cooled air chamber, and the original connecting fins 4. A reserved expansion gap 6 is provided between the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag cooler and the water-cooled wall tube 3 at the bottom of the water-cooled air chamber, which is formed by cutting off the original connecting fins 4. The water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag cooler and the water-cooled wall tube 3 at the bottom of the water-cooled air chamber are movably connected through the reserved expansion gap 6. A fully welded sealing area 7 is provided on the outside of the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag cooler. An adaptive sealing compensation component 5 is provided below the connection area between the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag cooler and the water-cooled wall tube 3 at the bottom of the water-cooled air chamber. A thermal expansion dynamic monitoring component is provided on the outside of the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag cooler. The thermal expansion dynamic monitoring component is arranged on the outside of the reserved expansion gap 6 and the sealing compensation component.

[0021] Specifically, by adopting the above technical solution, after removing 800mm of the original connecting fin 4, the slag lower tube of the slag cooler can obtain sufficient free expansion margin, completely releasing thermal expansion stress. This fundamentally avoids the problem of tearing and bursting of the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag lower tube of the slag cooler due to limited expansion. The adaptive sealing compensation component 5, through a three-level sealing structure of elastic pad + continuous welding + detachable sealing edge, compensates for the sealing gap after the original connecting fin 4 is removed. At the same time, it adapts to slight displacement and high-temperature deformation of the water-cooled wall tube 2 at the outlet of the water-cooled jacket of the slag lower tube of the slag cooler, preventing hot air leakage and ensuring boiler thermal efficiency. The thermal expansion dynamic monitoring component realizes non-contact and non-destructive monitoring, timely capturing abnormal equipment conditions and preventing the escalation of faults. This modification scheme does not require large-scale changes to the main structure of the boiler. The construction process is convenient and the cost is controllable. It can significantly reduce the probability of unplanned unit shutdowns and improve the safety, economy and long-term operation capability of the boiler.

[0022] Specifically, by adopting the above technical solution, the cutting length and range of the original connecting fin 4 can be precisely controlled, ensuring that the slag tube of the slag cooler has sufficient expansion space, while avoiding excessive cutting from affecting the structural strength. The arc grinding and anti-corrosion spraying treatment solve the problems of stress concentration and high-temperature oxidation corrosion at the cut after cutting, further improving the structural stability.

[0023] Specifically, the U-shaped groove structure can achieve precise fit with the connection area of ​​the water-cooled wall tube 2 at the outlet of the slag cooler's slag lower pipe and the water-cooled wall tube 3 at the bottom of the water-cooled air chamber. The elastic sealing gasket can fill the tiny gaps caused by slight displacement of the tube body or welding deformation. The detachable sealing plate facilitates later maintenance and inspection. The weld anti-corrosion protection sleeve prevents weld cracking caused by high-temperature oxidation. The three-level sealing structure ensures long-term stable sealing performance and has a deformation adjustment capability of ±5mm to adapt to the thermal deformation of the tube body during boiler operation, fundamentally solving the problem of easy air leakage in traditional fixed sealing boxes.

[0024] Specifically, the high-temperature resistant alloy material is suitable for the high-temperature operating conditions of the boiler, ensuring that the adaptive sealing compensation component 5 maintains structural stability and sealing reliability under long-term high-temperature environments. The composite material elastic sealing gasket has both high-temperature resistance and elastic deformation capability, achieving sealing while meeting deformation compensation requirements and extending the service life of the overall sealing structure. The continuous welding process of the heat-resistant elastic welding material can achieve a tight connection between the adaptive sealing compensation component 5 and the pipeline, while adapting to slight deformation and stretching. Strict control of weld height and quality effectively eliminates the risk of air leakage. The weld anti-corrosion protective sleeve further enhances the high-temperature oxidation resistance of the weld, ensuring that the boiler thermal efficiency is not affected, while improving the robustness and durability of the sealing structure.

[0025] Specifically, the seamless connection between the adaptive sealing compensation component 5 and the remaining original connecting fins 4 forms a complete sealing system. The anti-corrosion protection treatment of the weld further improves the reliability and stability of the sealing structure, avoiding air leakage caused by the failure of the connection between the original connecting fins 4 and the adaptive sealing compensation component 5. The sufficient thermal expansion design can fully meet the thermal expansion requirements of the slag lower pipe of the slag cooler during unit operation. The design without structural interference ensures a smooth expansion process. The deformation adjustment capability of the adaptive sealing compensation component 5 achieves the dual goals of "free expansion" and "stable sealing", ensuring the practical application effect and long-term operational reliability of the modification scheme.

[0026] Specifically, the non-contact monitoring method does not affect the free expansion of the tube body. The high-temperature and vibration-resistant sensor design is adapted to the high-temperature and high-vibration operating conditions of the boiler. The protective cover can effectively prevent high-temperature dust and coke residue from damaging the sensor, ensuring monitoring accuracy. The multi-point sensor arrangement can comprehensively capture the expansion state of the tube body and the temperature changes of the sealing area, providing accurate data for judging the equipment operating status. The data acquisition terminal realizes real-time processing of monitoring data and timely early warning of abnormal states, eliminating potential faults in their infancy and avoiding unit shutdown accidents caused by uncontrolled expansion or failure of seals in time. This achieves intelligent monitoring and risk prevention of boiler operation.

[0027] Specifically, after the unit is shut down, the connection area between the water-cooled wall tube 2 at the outlet of the slag cooler's slag lower pipe and the water-cooled wall tube 3 at the bottom of the water-cooled air chamber is cleaned in three stages. The first stage of cleaning uses high-pressure air to remove loose impurities, the second stage uses a wire brush to remove rust and oxide scale, and the third stage uses acetone to clean the welding contact surface to ensure that the connection surface is clean, dry, and free of any impurities that may affect construction. The original connecting fins 4 between the two are precisely cut off using plasma cutting equipment according to the preset range. The cutting length is strictly controlled to 800mm. The cutting range covers the symmetrical areas on both sides of the water-cooled wall tube 2 at the outlet of the slag cooler's slag lower pipe. The cutting temperature is controlled during the cutting process to avoid thermal damage to the pipe body. After cutting, the cut is ground with an arc radius of R≥5mm to remove burrs and sharp angles and avoid stress concentration. At the same time, a high-temperature resistant anti-corrosion coating is sprayed on the remaining cut surface of the original connecting fins 4 to form a reserved expansion gap 6.

[0028] Specifically, the prefabricated adaptive sealing compensation component 5 is positioned below the connection area between the outlet water-cooled wall tube 2 of the slag cooler's lower slag pipe and the bottom water-cooled wall tube 3 of the water-cooled air chamber. A high-temperature resistant flexible sealing gasket is pre-attached to the inside of the adaptive sealing compensation component 5. The installation position of the adaptive sealing compensation component 5 is precisely adjusted to ensure that it is tightly fitted with the contact position of the outlet water-cooled wall tube 2 of the slag cooler's lower slag pipe, the bottom water-cooled wall tube 3 of the water-cooled air chamber, and the contact surface of the original connecting fins 4. The elastic sealing gasket is fully compacted to ensure that the sealing gap meets the design requirements.

[0029] Specifically, the adaptive sealing compensation component 5 is welded and fixed according to the welding process requirements. Continuous welding is carried out using heat-resistant elastic welding material, and the weld height is not less than 3mm. The segmented welding method is used during the welding process to reduce welding deformation. After the welding is completed, the weld is 100% visually inspected. After there are no defects such as porosity, slag inclusion, or incomplete penetration, a high-temperature resistant anti-corrosion protective sleeve is installed on the weld, and a detachable high-temperature resistant edge sealing plate is installed at the end of the adaptive sealing compensation component 5.

[0030] Specifically, after the adaptive sealing compensation component 5 is installed, the thermal expansion dynamic monitoring component is deployed. Miniature displacement sensors are symmetrically installed on both sides of the reserved expansion gap 6. Temperature sensors are installed on the top and sides of the adaptive sealing compensation component 5. High-temperature resistant stainless steel protective covers are installed on the outside of all sensors. The sensor signal lines are fixedly arranged along the boiler support and connected to the data acquisition terminal. The monitoring component is powered on and debugged, the threshold is set, and the early warning function is tested.

[0031] In summary, this modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler in a circulating fluidized bed boiler utilizes a basic expansion release component consisting of the water-cooled wall tube 2 at the outlet of the slag cooler's lower slag tube water-cooled jacket, the water-cooled wall tube 3 at the bottom of the water-cooled air chamber, and the original connecting fins 4. By removing 800mm of the original connecting fins 4 to create a reserved expansion gap 6, the device ensures that the thermal expansion of the water-cooled wall tube 2 at the outlet of the slag cooler's lower slag tube water-cooled jacket is not less than 20mm without structural interference. This completely releases thermal expansion stress, fundamentally preventing the outlet tube from tearing and bursting, significantly reducing the probability of unplanned boiler unit shutdowns, and improving operational safety. The adaptive sealing compensation component 5 is a U-shaped groove elastic sealing box, which is adapted to the connection size of the water-cooled wall tube 2 at the outlet of the slag lower pipe of the slag cooler and the water-cooled wall tube 3 at the bottom of the water-cooled air chamber. It has a deformation adjustment capability of ±5mm and can adaptively deform with slight displacement of the tube body. Combined with the miniature displacement sensor and temperature sensor of the thermal expansion dynamic monitoring component, it realizes real-time monitoring of equipment status and dual early warning. It not only eliminates the problem of hot air leakage and ensures the thermal efficiency of the boiler, but also captures potential faults in time, realizes intelligent operation and control of the boiler. Moreover, the overall transformation does not require modification of the main structure of the boiler, and the construction is convenient and highly versatile.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag discharge pipe in a circulating fluidized bed boiler, comprising a slag discharge pipe body (1), characterized in that: The outside of the slag discharge pipe body (1) is provided with a water-cooled wall pipe (2) at the outlet of the slag cooler slag discharge pipe water-cooled jacket, the outside of the water-cooled wall pipe (2) at the outlet of the slag cooler slag discharge pipe water-cooled jacket is provided with a water-cooled air chamber bottom water-cooled wall pipe (3), the outside of the water-cooled wall pipe (2) at the outlet of the slag cooler slag discharge pipe water-cooled jacket is provided with an original connecting fin (4), and the outside of the water-cooled wall pipe (2) at the outlet of the slag cooler slag discharge pipe water-cooled jacket is provided with an adaptive sealing compensation component (5).

2. The modification device for preventing the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler from expanding under restricted conditions, as described in claim 1, is characterized in that: The slag cooler lower slag tube water-cooled jacket outlet water-cooled wall tube (2), the water-cooled air chamber bottom water-cooled wall tube (3), and the original connecting fins (4) constitute the basic expansion release assembly. A reserved expansion gap (6) is provided between the slag cooler lower slag tube water-cooled jacket outlet water-cooled wall tube (2) and the water-cooled air chamber bottom water-cooled wall tube (3), which is formed by cutting off the original connecting fins (4). The slag cooler lower slag tube water-cooled jacket outlet water-cooled wall tube (2) and the water-cooled air chamber bottom water-cooled wall tube (3) are connected by the reserved expansion gap (6). The slag cooler is connected to the outside of the water-cooled wall tube (2) of the slag cooler water jacket outlet. A full-welded sealing area (7) is provided on the outside of the slag cooler water jacket outlet water-cooled wall tube (2) and the bottom water-cooled wall tube (3) of the water-cooled air chamber. A thermal expansion dynamic monitoring component is provided on the outside of the slag cooler water jacket outlet water-cooled wall tube (2). The thermal expansion dynamic monitoring component is arranged on the reserved expansion gap (6) and the outside of the sealing compensation component.

3. The modification device for preventing the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler from expanding under restricted conditions, as described in claim 1, is characterized in that: The length of the original connecting fin (4) to be cut is 800mm, and the cutting range covers the symmetrical area on both sides of the outlet water-cooled wall tube (2) of the slag cooler lower slag tube water-cooled jacket. After the original connecting fin (4) is cut, the cut is ground with an arc of R≥5mm and sprayed with a high-temperature resistant and anti-corrosion coating with a temperature resistance of not less than 800℃.

4. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler, as described in claim 2, is characterized in that: The adaptive sealing compensation component (5) is a U-shaped groove elastic sealing box. Its groove size is adapted to the outer diameter of the water-cooled wall tube (2) at the outlet of the water-cooled jacket of the slag cooler and the spacing of the water-cooled wall tube (3) at the bottom of the water-cooled air chamber. The U-shaped groove elastic sealing box is provided with a high-temperature resistant flexible sealing pad on the inner side and a detachable high-temperature resistant sealing plate at the end. A high-temperature resistant anti-corrosion protective sleeve is added to the weld joint. The whole has a deformation adjustment capability of ±5mm.

5. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler according to claim 2, characterized in that: The U-shaped groove elastic sealing box is made of high-temperature resistant alloy material, specifically 12Cr1MoVG or a metal material with equivalent high-temperature resistant properties. The high-temperature resistant flexible sealing gasket is a composite material of ceramic fiber and high-temperature resistant rubber, with a temperature resistance of not less than 1000℃. The detachable high-temperature resistant edge sealing plate is made of the same material as the sealing box.

6. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler according to claim 2, characterized in that: The top edge of the U-shaped groove elastic sealing box is fixed by continuous welding at the contact position between the water-cooled wall tube (2) at the outlet of the water-cooled jacket of the slag cooler and the contact position between the water-cooled wall tube (3) at the bottom of the water-cooled air chamber. The welding uses heat-resistant elastic welding material, the weld height is not less than 3mm, and there are no defects such as pores, slag inclusions and incomplete penetration. After welding, a high-temperature resistant anti-corrosion protective sleeve is installed on the weld.

7. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler according to claim 2, characterized in that: The thermal expansion dynamic monitoring component includes a miniature displacement sensor, a temperature sensor, a data acquisition terminal, and a high-temperature resistant stainless steel protective cover. There are two miniature displacement sensors, which are symmetrically arranged on the water-cooled wall tubes (3) at the bottom of the water-cooled air chamber on both sides of the reserved expansion gap (6). There are three temperature sensors, which are arranged on the top and both sides of the U-shaped groove elastic sealing box. Each sensor is equipped with a high-temperature resistant stainless steel protective cover on its outer side.

8. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler according to claim 5, characterized in that: The thermal expansion of the outlet water-cooled wall tube (2) of the slag lower tube of the slag cooler within the reserved expansion gap (6) is not less than 20 mm, and there is no structural interference during the expansion process. The U-shaped groove elastic sealing box adapts to the slight displacement of the tube body and the sealing performance is not affected.

9. A modification device for preventing the expansion restriction of the water-cooled jacket of the slag cooler tube in a circulating fluidized bed boiler according to claim 7, characterized in that: The miniature displacement sensor is a laser non-contact sensor with a measurement accuracy of ±0.1mm. The temperature sensor is a sheathed thermocouple sensor with a temperature resistance of not less than 1200℃. The data acquisition terminal is preset with expansion and temperature thresholds and has on-site audible and visual alarms as well as remote data upload and early warning functions linked with the boiler central control system.

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