Wall enclosure superheater pipe and water cooling wall sealing device

Abstract

The invention relates to the technical field of water cooling wall installation, in particular to a wall enclosure superheater pipe and water cooling wall sealing device which comprises a connecting sealing mechanism, the connecting sealing mechanism comprises a protective shell, a communicating pipe is installed in the protective shell, and the two ends of the communicating pipe penetrate through the front face and the rear face of the protective shell correspondingly; inner grooves are formed in the front face and the rear face of the protective shell correspondingly, and the inner grooves and the communicating pipe are concentric. The communicating pipe is arranged in the protective shell, the inner groove with the communicating pipe as the axis is formed in the outer surface of the protective shell, and during installation, the superheater main body pipe and the water cooling wall main body pipe are inserted into the inner groove and communicate with the communicating pipe, so that the sealing performance of the connecting position is improved; and the connecting positions of the superheater main body pipe and the water-cooled wall main body pipe and the communicating pipe are limited through cooperation of the protective shell and the inner groove, so that the connecting positions of the superheater main body pipe and the water-cooled wall main body pipe and the communicating pipe are prevented from being broken.

Description

Technical Field

[0001] The invention relates to the technical field of water-cooled wall installation, in particular to a sealing device for a wall-wrapped superheater tube and a water-cooled wall. Background Art

[0002] Wall-enclosed superheaters, also known as wall-type superheaters, are primarily located on the furnace wall. They absorb radiant heat from the furnace to heat the steam, hence the name radiant superheater. When used in conjunction with a convection superheater, they can improve steam temperature regulation. While this type of superheater consumes less metal, due to the high furnace heat load and poor steam cooling performance within the tubes, operational safety considerations should be taken. During startup, feedwater cooling or steam from other boilers should be used to ensure adequate cooling of the radiant superheater tubes.

[0003] The water wall is the primary heat-receiving part of the boiler. It consists of several rows of steel pipes distributed around the boiler furnace. Water or steam flows inside, and the outside receives heat from the boiler furnace flame. The water wall primarily absorbs radiant heat from the high-temperature combustion products in the furnace. The working fluid rises through the water wall, evaporating as it heats up.

[0004] Therefore, the wall-clad superheater needs to be used in conjunction with the water-cooled wall. When installing the wall-clad superheater and the water-cooled wall, in order to circulate the liquid, the wall-clad superheater tubes and the water-cooled wall tubes need to be connected. Generally, the pipes of the wall-clad superheater and the water-cooled wall are connected through flanges. When the connection is exposed to high temperature for a long time, the sealing ring between the flanges will quickly age and leak. In addition, the connecting flanges will also deform and crack due to thermal expansion and contraction, resulting in an unstable connection.

[0005] To this end, the present application proposes a wall-clad superheater tube and water-cooled wall sealing device for improving the stability of the connection between the wall-clad superheater tube and the water-cooled wall tube. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a wall-clad superheater tube and water-cooled wall sealing device to solve the problem of unstable sealing at the connection between the wall-clad superheater tube and the water-cooled wall tube in the prior art.

[0007] To achieve the above-mentioned and other related objectives, the present invention provides a sealing device for a wall-clad superheater tube and a water-cooled wall, comprising a connecting sealing mechanism, the connecting sealing mechanism comprising a protective shell, a connecting pipe installed inside the protective shell, and the two ends of the connecting pipe respectively penetrating the front and rear surfaces of the protective shell;

[0008] The front and rear surfaces of the protective shell are both provided with inner grooves, the inner grooves are cocentric with the connecting pipe, and the diameter of the inner grooves is larger than the diameter of the connecting pipe. The inner grooves are provided with a plurality of flange fixing holes.

[0009] Preferably, a superheater main tube and a water-cooled wall main tube are respectively installed on both sides of the connecting tube, and the ends of the superheater main tube and the water-cooled wall main tube have the same structure, and the superheater main tube and the water-cooled wall main tube are respectively inserted into the inner groove from both ends of the connecting tube and fixed;

[0010] The superheater main tube and the water-cooled wall main tube both include a tube head, and the end of the tube head is fixedly connected to a flange plate, and the flange plate can be inserted into the interior of the inner groove.

[0011] Preferably, the connecting pipe includes an intermediate pipe and plug-in pipes at both ends of the intermediate pipe, the diameter of the intermediate pipe is larger than the diameters of the plug-in pipes at both ends, and the inner walls of the ends of the plug-in pipes are provided with countersunk holes;

[0012] A plug connector is fixedly connected to the axis of the flange away from the pipe head, and the plug connector is connected to the pipe head;

[0013] The plug connector can be plugged into the plug tube of the connecting pipe and limited by the countersunk hole.

[0014] Preferably, a cavity is provided inside the protective shell, and the connecting pipe passes through the cavity;

[0015] The upper and lower ends of the protective shell are both provided with ventilation slots, and the ventilation slots at the upper and lower ends are interconnected to form an air flow channel.

[0016] Preferably, the outer surface of a section of the connecting pipe located inside the cavity of the protective shell is provided with heat dissipation fins, and the number of the heat dissipation fins is multiple, and the multiple heat dissipation fins are distributed in a circular array on the outer surface of the connecting pipe;

[0017] A gap is left between two adjacent heat dissipation fins on each connecting tube, and the heat dissipation fins are distributed around the connecting tube in a central radial pattern. The front and rear ends of the heat dissipation fins are fixedly connected to the inner walls of the front and rear surfaces of the protective shell.

[0018] Preferably, reinforcing ribs are provided at the connection points between both sides of the heat dissipation fins and the connecting pipes, and the reinforcing ribs and the heat dissipation fins directly form a slope to support the heat dissipation fins.

[0019] Preferably, the number of the connecting pipes is two, and the two connecting pipes are installed inside the protective shell in a bilaterally symmetrical manner about the center of the protective shell.

[0020] The superheater main tube and the water-cooled wall main tube both include a water inlet pipe and a water outlet pipe. The water inlet pipes of the superheater main tube and the water-cooled wall main tube are installed on one group of connecting pipes, and the water outlet pipes of the superheater main tube and the water-cooled wall main tube are installed on another group of connecting pipes.

[0021] Preferably, the distance between the two groups of connecting pipes is greater than the length of the heat dissipation fins, and a gap is left between the two groups of heat dissipation fins.

[0022] Preferably, a sealing gasket is provided between the inner groove and the flange, and the diameter of the sealing gasket is equal to the inner diameter of the inner groove.

[0023] Preferably, the sealing gasket includes a gasket ring, the gasket ring is provided with a through hole corresponding to the position of the flange fixing hole, and the gasket ring is provided with a plurality of filling cavities, each of the filling cavities is located between two through holes;

[0024] The interior of the filling cavity is filled with an expansion agent.

[0025] As described above, the present invention discloses a wall-wrapped superheater tube and water-cooled wall sealing device, which has the following beneficial effects: the present invention arranges a connecting tube inside the protective shell, and opens an inner groove with the connecting tube as the axis on the outer surface of the protective shell. During installation, the superheater main tube and the water-cooled wall main tube are inserted into the inner groove and connected with the connecting tube, thereby improving the sealing of the connection; and the protective shell and the inner groove cooperate to limit the connection between the superheater main tube, the water-cooled wall main tube and the connecting tube, thereby reducing the space for deformation of the connection between the superheater main tube, the water-cooled wall main tube and the connecting tube, thereby avoiding breakage of the connection between the superheater main tube, the water-cooled wall main tube and the connecting tube, thereby achieving the effect of improving the stability of the connection.

[0026] At the same time, the interior of the protective shell has a cavity, which is connected to the cavity by opening ventilation grooves on the upper and lower sides of the protective shell. When high-temperature liquid is transmitted through the connecting pipe, part of the heat will be dissipated into the cavity of the protective shell. According to the principle that hot air flows in the direction of cold air, the heat will be discharged from the ventilation groove along with the air flow, thereby reducing the temperature of the connecting pipe and the connection between the connecting pipe and the superheater main pipe and the water-cooled wall main pipe, avoiding cracking of the connection due to high temperature, thereby achieving the effect of protecting the connection.

[0027] Furthermore, heat dissipation fins are provided on the surface of the connecting pipe, thereby increasing the heat dissipation area of ​​the connecting pipe surface, allowing heat to be dissipated to the interior of the protective shell more quickly and then discharged, thereby achieving the effect of improving the heat dissipation rate.

[0028] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a schematic structural diagram of the present invention;

[0030] Figure 2 Shown is a top view of the present invention;

[0031] Figure 3 Shown is an exploded view of the present invention;

[0032] Figure 4 Shown is a structural schematic diagram of the connection and sealing mechanism of the present invention;

[0033] Figure 5 Shown is a structural cross-sectional view of the connection and sealing mechanism of the present invention;

[0034] Figure 6 Shown as the present invention Figure 5 A magnified view of the structure at center A;

[0035] Figure 7 Shown is a schematic structural diagram of the superheater main tube and the water wall main tube of the present invention;

[0036] Figure 8 Shown is a schematic diagram of the assembly of the sealing gasket of the present invention;

[0037] Figure 9 Shown is a cross-sectional view of the sealing gasket structure of the present invention;

[0038] Component number description:

[0039] 1. Connecting sealing mechanism; 101. Protective shell; 102. Connecting pipe; 103. Inner groove; 104. Flange fixing hole; 105. Heat dissipation fin; 106. Ventilation slot; 107. Reinforcement rib; 2. Superheater main tube; 3. Water-cooled wall main tube; 4. Tube head; 5. Flange; 6. Plug connector; 7. Sealing gasket; 701. Gasket rubber ring; 702. Through hole; 703. Filling cavity. DETAILED DESCRIPTION

[0040] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0041] See also Figures 1 to 9 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0042] like Figures 1-9 As shown, the present invention provides a sealing device for a wall-wrapped superheater tube and a water-cooled wall, comprising a connecting sealing mechanism 1, the connecting sealing mechanism 1 comprising a protective shell 101, a connecting pipe 102 being installed inside the protective shell 101, and both ends of the connecting pipe 102 respectively passing through the front and rear surfaces of the protective shell 101;

[0043] The front and rear surfaces of the protective shell 101 are both provided with inner grooves 103 . The inner groove 103 is cocentric with the connecting pipe 102 , and the diameter of the inner groove 103 is larger than that of the connecting pipe 102 . The inner groove 103 is provided with a plurality of flange fixing holes 104 .

[0044] The superheater main tube 2 and the water-cooled wall main tube 3 are respectively installed on both sides of the connecting tube 102. The structures of the ends of the superheater main tube 2 and the water-cooled wall main tube 3 are the same, and the superheater main tube 2 and the water-cooled wall main tube 3 are respectively inserted into the inside of the inner groove 103 from both ends of the connecting tube 102 and fixed.

[0045] Through the above technical solution, a connecting pipe 102 is provided inside the protective shell 101, and an inner groove 103 with the connecting pipe 102 as the axis is provided on the outer surface of the protective shell 101. During installation, the superheater main tube 2 and the water-cooled wall main tube 3 are inserted into the inner groove 103 and communicate with the connecting pipe 102, thereby improving the sealing of the connection compared to direct installation. In addition, the protective shell 101 and the inner groove 103 cooperate to limit the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting pipe 102, reducing the space for deformation at the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting pipe 102, avoiding the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting pipe 102 from breaking, thereby achieving the effect of improving the stability of the connection.

[0046] The principle is as follows: the connection between the superheater main tube 2, the water-cooled wall main tube 3 and the connecting tube 102 is wrapped by the inner groove 103. When the superheater main tube 2 and the water-cooled wall main tube 3 expand due to heat, the expansion of the superheater main tube 2 and the water-cooled wall main tube 3 is limited due to the obstruction of the inner groove 103. Therefore, the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting tube 102 can be prevented from breaking.

[0047] Based on the above technical solution, the superheater main tube 2 and the water-cooled wall main tube 3 both include a tube head 4. The tube head 4 is a superheater tube or a water-cooled wall tube. The end of the tube head 4 is fixedly connected with a flange 5. The flange 5 is inserted into the inner groove 103. The flange 5 is covered by the inner groove 103 to increase the contact area and thus improve the sealing. The flange 5 is penetrated by bolts, and the bolts cooperate with the flange fixing holes 104 to fix the flange 5, so that the flange 5 is stably fixed inside the inner groove 103 and will not fall off.

[0048] In some embodiments, the connecting pipe 102 includes a middle pipe and plug-in pipes at both ends of the middle pipe. The diameter of the middle pipe is larger than the diameter of the plug-in pipes at both ends. The middle pipe with a larger diameter is provided to increase the heat dissipation area of ​​the connecting pipe 102. The inner wall of the end of the plug-in pipe is provided with a countersunk hole.

[0049] The flange 5 is fixedly connected to the axial center of the side away from the pipe head 4 with a plug connector 6, which is connected to the pipe head 4. When the plug connector 6 is connected to the connecting pipe 102 in a plug-in manner, the sealing performance of the connection can be improved.

[0050] The plug connector 6 can be inserted into the plug tube of the connecting pipe 102 and limited by the countersunk hole. The countersunk hole is set inside the plug tube. The countersunk hole can limit the insertion depth of the plug connector 6 to avoid excessive penetration when installing the plug connector 6. The countersunk hole can also be used to overlap with the end of the plug connector 6 to improve the sealing performance.

[0051] In a further embodiment, a cavity is provided inside the protective shell 101, and the connecting tube 102 passes through the cavity, so that the heat of the connecting tube 102 can be dissipated into the cavity of the protective shell 101; ventilation grooves 106 are provided at the upper and lower ends of the protective shell 101, and the ventilation grooves 106 at the upper and lower ends are interconnected to form an airflow channel, which can dissipate heat to the connecting tube 102 through the flowing airflow, thereby reducing the impact of high temperature on the connecting tube 102.

[0052] In some embodiments, a section of the connecting pipe 102 located inside the cavity of the protective housing 101 has heat dissipation fins 105 fixedly connected to its outer surface. The purpose of providing the heat dissipation fins 105 is to increase the contact area between the outer surface of the connecting pipe 102 and the air, thereby improving the thermal conductivity of the connecting pipe 102. The number of heat dissipation fins 105 is multiple, and the multiple heat dissipation fins 105 are distributed in a circumferential array on the outer surface of the connecting pipe 102.

[0053] A gap is left between adjacent fins 105 on each connecting tube, and the fins 105 are radially distributed around the connecting tube. The distribution and spacing of the fins 105 are designed to reduce interference between the fins 105. When the fins 105 are too close together, the heat dissipation efficiency decreases. The front and rear ends of the fins 105 are fixedly connected to the inner walls of the protective housing 101 on both the front and rear sides, supporting the connecting tube 102, increasing its strength and resistance to deformation.

[0054] On the basis of the above embodiment, reinforcing ribs 107 are provided at the connection between both sides of the heat sink fins 105 and the connecting tube 102. The reinforcing ribs 107 are used to increase the thickness of the connection of the heat sink fins 105, thereby increasing the strength of the heat sink fins 105 and making the heat sink fins 105 themselves resistant to deformation, thereby improving the anti-deformation ability of the connecting tube 102. The reinforcing ribs 107 and the heat sink fins 105 directly form a slope to support the heat sink fins 105, so that the heat sink fins 105 become thinner in the form of a gradually disappearing surface, thereby avoiding the heat sink fins 105 from suddenly becoming thinner and making the thinned position easy to break.

[0055] In some embodiments, there are two groups of connecting pipes 102, which are installed inside the protective housing 101 in a bilaterally symmetrical manner about the center of the protective housing 101. The purpose of providing two groups of connecting pipes 102 is to place the inlet and outlet water pipes of the superheater and the water-cooled wall close together, which facilitates operation during installation and makes it easier to manage the circulation of the circulating water.

[0056] Specifically, the superheater main tube 2 and the water-cooled wall main tube 3 both include a water inlet pipe and a water outlet pipe. The water inlet pipes of the superheater main tube 2 and the water-cooled wall main tube 3 are installed on a group of connecting pipes 102, and the water outlet pipes of the superheater main tube 2 and the water-cooled wall main tube 3 are installed on another group of connecting pipes 102, so that the water supply and water outlet are separate pipelines, and the pipelines will not interfere with each other.

[0057] The two sets of connecting pipes 102 are close to each other, and the heat dissipation fins 105 installed on the surfaces of the two sets of connecting pipes 102 are close to each other, which can effectively improve the efficiency of temperature equalization. The distance between the two sets of connecting pipes 102 is greater than the length of the heat dissipation fins 105, and there is a gap between the two sets of heat dissipation fins 105. The gap between the two sets of heat dissipation fins 105 is to prevent the temperature of the water outlet pipe from being directly transmitted to the water inlet pipe, which would prevent the water inlet pipe from cooling the water wall during the circulation process. When water circulates, the temperature of the water inlet pipe will be lower than that of the water outlet pipe. When the two sets of connecting pipes 102 are close to each other, part of the temperature diffused by the water outlet pipe will be absorbed by the water inlet pipe, thereby slightly equalizing the temperature of the cavity inside the protective housing 101.

[0058] In some embodiments, a sealing gasket 7 is further installed between the inner groove 103 and the flange 5. The diameter of the sealing gasket 7 is equal to the inner diameter of the inner groove 103. The purpose of installing the sealing gasket 7 is to further improve the sealing performance of the connection between the superheater main tube 2 and the water wall main tube 3 and the connecting pipe 102. During installation, a clamping force is applied to the sealing gasket 7 so that the sealing gasket 7 fills the connection and prevents leakage caused by the flange 5 and the inner wall of the inner groove 103 from not fitting together.

[0059] Specifically, the sealing gasket 7 includes a gasket rubber ring 701, which is provided with a through hole 702 at the same position as the flange fixing hole 104. A filling cavity 703 is provided between the internal through holes 702 of the gasket rubber ring 701. The gasket rubber ring 701 is used to fill the gap between the flange plate 5 and the inner groove 103 through deformation, and the through hole 702 is used to facilitate the installation and fixation of the flange plate 5 by the penetration of bolts.

[0060] The interior of the filling cavity 703 is filled with an expansion agent. The purpose of setting up the filling cavity 703 and filling the filling cavity 703 with the expansion agent is that during the installation and use process, the heat will cause the expansion agent to expand, thereby pushing the outer surface of the gasket rubber ring 701 to contact the flange 5, so that the bolts on the flange 5 are always in a strained state, so as to improve the stability of the bolt installation and prevent the bolts from loosening easily.

[0061] The specific use process of the present invention is as follows:

[0062] The superheater main tube 2 and the water wall main tube 3 are connected to the connecting pipe 102 from both sides of the protective shell 101 respectively, and the flanges 5 in the superheater main tube 2 and the water wall main tube 3 are inserted into the inner groove 103 and fit in the inner groove 103, and a sealing gasket 7 is placed between the flange 5 and the inner groove 103 for sealing and buffering;

[0063] When liquid circulates, the flange 5 is wrapped by the inner groove 103, which results in a smaller space for thermal expansion and deformation of the flange 5, making it less likely for the material to break. Moreover, when the sealing gasket 7 is heated, the expansion agent in the filling cavity 703 expands, thereby applying pressure to the flange 5. The pressure application process causes the flange 5 to push the bolts, causing the thread teeth of the bolts to bite tightly, thereby reducing the possibility of the bolts loosening.

[0064] During liquid circulation, the heat absorbed by the communication pipe 102 is dissipated to the interior of the protective housing 101 through the heat dissipation fins 105 , and then the airflow generated by the heat conversion is carried out from the ventilation slots 106 .

[0065] In summary, the wall-wrapped superheater tube and water-cooled wall sealing device of the present invention is provided with a connecting pipe 102 inside the protective shell 101, and an inner groove 103 with the connecting pipe 102 as the axis is provided on the outer surface of the protective shell 101. During installation, the superheater main tube 2 and the water-cooled wall main tube 3 are inserted into the inner groove 103 and connected with the connecting pipe 102, thereby improving the sealing of the connection. The protective shell 101 and the inner groove 103 cooperate to limit the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting pipe 102, thereby reducing the space for deformation of the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting pipe 102, thereby avoiding fracture of the connection between the superheater main tube 2 and the water-cooled wall main tube 3 and the connecting pipe 102, thereby achieving the effect of improving the stability of the connection.

[0066] At the same time, the present invention provides a cavity inside the protective shell 101. Ventilation slots 106 are provided on the upper and lower sides of the protective shell 101 to communicate with the cavity. When high-temperature liquid is transmitted through the connecting pipe 102, some heat will be dissipated into the cavity of the protective shell 101. According to the principle that hot air flows in the direction of cold air, the heat will be discharged from the position of the ventilation slots 106 along with the airflow, thereby reducing the temperature of the connecting pipe 102 and the connection between the connecting pipe 102 and the superheater main tube 2 and the water-cooled wall main tube 3, thereby preventing the connection from cracking due to high temperature, thereby achieving the effect of protecting the connection.

[0067] Heat dissipation fins 105 are provided on the surface of the connecting pipe 102 to increase the heat dissipation area of ​​the connecting pipe 102 , so that the heat can be dissipated to the inside of the protective shell 101 more quickly and discharged, thereby achieving the effect of improving the heat dissipation rate.

[0068] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A sealing device for a wall-wrapped superheater tube and a water-cooled wall, comprising a connecting sealing mechanism (1), characterized in that: The connection sealing mechanism (1) comprises a protective shell (101), a connecting pipe (102) is installed inside the protective shell (101), and both ends of the connecting pipe (102) respectively penetrate the front and rear surfaces of the protective shell (101); The front and rear surfaces of the protective shell (101) are both provided with inner grooves (103), the inner groove (103) and the connecting pipe (102) are cocentric, and the diameter of the inner groove (103) is larger than the diameter of the connecting pipe (102), and the inner groove (103) is provided with a plurality of flange fixing holes (104).

2. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 1, characterized in that: The superheater main tube (2) and the water-cooled wall main tube (3) are respectively installed on both sides of the connecting tube (102), and the structures of the ends of the superheater main tube (2) and the water-cooled wall main tube (3) are the same, and the superheater main tube (2) and the water-cooled wall main tube (3) are respectively inserted from both ends of the connecting tube (102) into the inside of the inner groove (103) and fixed; The superheater main tube (2) and the water-cooled wall main tube (3) both include a tube head (4), the end of the tube head (4) is fixedly connected with a flange (5), and the flange (5) can be inserted into the interior of the inner groove (103).

3. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 2, characterized in that: The connecting pipe (102) includes a middle pipe and plug-in pipes at both ends of the middle pipe, the diameter of the middle pipe is larger than the diameters of the plug-in pipes at both ends, and the inner walls of the ends of the plug-in pipes are provided with countersunk holes; A plug connector (6) is fixedly connected to the axis of the flange (5) away from the pipe head (4), and the plug connector (6) is connected to the pipe head (4); The plug connector (6) can be plugged into the plug tube of the connecting pipe (102) and is limited by the countersunk hole.

4. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 2, characterized in that: A cavity is provided inside the protective shell (101), and the connecting pipe (102) passes through the cavity; The upper and lower ends of the protective shell (101) are both provided with ventilation slots (106), and the ventilation slots (106) at the upper and lower ends are interconnected to form an air flow channel.

5. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 4, characterized in that: The connecting pipe (102) is located in a section inside the cavity of the protective shell (101), and a heat dissipation fin (105) is provided on the outer surface thereof. The number of the heat dissipation fins (105) is multiple, and the multiple heat dissipation fins (105) are distributed in a circumferential array on the outer surface of the connecting pipe (102); A gap is left between two adjacent heat dissipation fins (105) on each connecting tube, and the heat dissipation fins (105) are distributed radially around the connecting tube. The front and rear ends of the heat dissipation fins (105) are fixedly connected to the inner walls of the front and rear surfaces of the protective shell (101).

6. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 5, characterized in that: Reinforcement ribs (107) are provided at the connection points between both sides of the heat dissipation fin (105) and the connecting pipe (102), and the reinforcement ribs (107) and the heat dissipation fin (105) directly form a slope to support the heat dissipation fin (105).

7. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 6, characterized in that: The number of the connecting pipes (102) is two groups, and the two groups of connecting pipes (102) are installed inside the protective shell (101) in a left-right symmetrical manner around the center of the protective shell (101); The superheater main tube (2) and the water-cooled wall main tube (3) both comprise a water inlet pipe and a water outlet pipe, the water inlet pipes of the superheater main tube (2) and the water-cooled wall main tube (3) being installed on a group of connecting tubes (102), and the water outlet pipes of the superheater main tube (2) and the water-cooled wall main tube (3) being installed on another group of connecting tubes (102).

8. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 7, characterized in that: The distance between the two groups of connecting pipes (102) is greater than the length of the heat dissipation fins (105), and a gap is left between the two groups of heat dissipation fins (105).

9. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 8, characterized in that: A sealing gasket (7) is further provided between the inner groove (103) and the flange (5), and the diameter of the sealing gasket (7) is equal to the inner diameter of the inner groove (103).

10. The sealing device for a wall-wrapped superheater tube and a water-cooled wall according to claim 9, characterized in that: The sealing gasket (7) includes a gasket rubber ring (701), a through hole (702) corresponding to the position of the flange fixing hole (104) is formed on the gasket rubber ring (701), and a plurality of filling cavities (703) are provided inside the gasket rubber ring (701), and each of the filling cavities (703) is located between two through holes (702); The interior of the filling cavity (703) is filled with an expansion agent.

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