Sealing and heat insulation structure of wall-penetrating pipe of waste heat boiler

Abstract

This utility model discloses a sealing and heat insulation structure for a waste heat boiler through-wall pipe, including a furnace wall and a through-wall pipe with a gap between them. It also includes a limiting member, an annular seal, an outer seal, and a corrugated pipe. The limiting member is fixed to the through-wall pipe and located inside the waste heat boiler. The annular seal is positioned between the limiting member and the furnace wall, with one side of the annular seal fitting against the inner side of the furnace wall to seal the gap. The outer seal is fixed to the outer edge of the through-wall pipe and fitting against the outer side of the furnace wall. The corrugated pipe is sleeved over the through-wall pipe and the outer seal, with one end fixed to the outer side of the furnace wall and the other end filled with inorganic refractory fiber sealant. This utility model achieves static sealing of the gap in a cold state through the cooperation of the inorganic refractory fiber annular seal and the outer seal, and achieves dynamic sealing of the gap in a hot state through the cooperation of the annular seal, the limiting member, the corrugated pipe, and the inorganic refractory fiber sealant.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler technology, specifically to a sealing and heat insulation structure for a waste heat boiler through-wall pipe. Background Technology

[0002] The heat exchanger tube assemblies of the waste heat boiler are arranged inside the boiler furnace wall, while the high and low pressure steam drums and steam headers are located outside the boiler furnace wall. Therefore, pipes of different diameters are arranged through the furnace wall. The temperature inside the through-wall pipes is approximately 560℃, while the flue gas temperature inside the furnace is approximately 650℃, and the flue gas pressure is approximately 4 kPa. During equipment operation, the through-wall pipes will experience small-scale vertical and horizontal displacements. The sealing problem between the through-wall pipes and the outer furnace wall has always been a common problem plaguing gas turbine power plants.

[0003] Currently, the industry typically installs corrugated metal expansion joints at the junction of the through-wall pipe and the outer furnace wall outside the furnace wall. This prevents flue gas from escaping while allowing space for the displacement of the through-wall pipe. One end of the corrugated metal expansion joint is fixed to the outer furnace wall, and the other end is fixed to the through-wall pipe. Insulation material is filled between the corrugated metal expansion joint and the pipe for heat insulation. Inside the furnace wall, insulation modules are arranged around the through-wall pipe for heat insulation and smoke protection.

[0004] In actual unit operation, the existing solution suffers from the gradual widening of the gap between the insulation and the pipes inside the furnace wall due to the displacement of the through-wall pipes. This leads to the gradual failure of the insulation, allowing hot flue gas to leak through the gaps and erode the outer steel plate of the furnace wall. In severe cases, it can even affect the safe operation of nearby equipment such as cable trays. Once a leak occurs, the original sealing device of the through-wall pipe must be destructively removed, which is difficult to carry out and has high replacement costs. Utility Model Content

[0005] The main purpose of this utility model is to provide a sealing and heat insulation structure for waste heat boiler through-wall pipes to solve the shortcomings of existing sealing solutions.

[0006] To solve the above-mentioned technical problems, this utility model proposes a sealing and heat insulation structure for a waste heat boiler through-wall pipe, including a furnace wall and a through-wall pipe, wherein the through-wall pipe vertically penetrates the furnace wall, and there is a gap between the furnace wall and the through-wall pipe, and further includes: A limiting component fixedly installed on the outer edge of the through-wall pipe and located inside the waste heat boiler; An annular seal is provided between the limiting member and the furnace wall. One end of the annular seal is fitted with the inner side of the furnace wall to seal the gap. The annular seal is made of refractory material with ductility and elasticity. Its inner ring is fitted with the through-wall pipe and its outer ring is provided with a limiting ring. The thickness of the annular seal is not less than 100 mm. The limiting member is squeezed and pressed against the annular seal when hot. An external sealing element that is fixedly installed on the outer edge of the through-wall pipe and fits against the outer side of the furnace wall in a cold state to seal the gap; A corrugated pipe is fitted around the through-wall pipe and the outer seal. One end of the corrugated pipe is fixed to the outside of the furnace wall. The outer diameter of the outer seal is smaller than the inner diameter of the corrugated pipe. The free end of the corrugated pipe and the through-wall pipe are filled with inorganic refractory fiber sealant.

[0007] Furthermore, the distance between the other end of the annular seal and the limiting member is L mm, the outward displacement of the through-wall pipe in the hot state is S mm, and the extrusion deformation of the thickness of the annular seal is Δt mm, satisfying: S = L + Δt.

[0008] Furthermore, the annular seal is made of inorganic refractory fiber, and its preparation steps include: Step 1: Weigh the raw materials according to the following proportions: 33-48 parts alumina, 45-60 parts silicon dioxide, and 0.1-1 parts additives. Mix and melt the raw materials according to the proportions. Step 2: The molten raw material is spun into fibers. At the same time as spun, an additive is sprayed onto the fibers in a spraying manner through a material addition device. The additive consists of cocoyl diethanolamide and silica sol, with cocoyl diethanolamide accounting for 85-95% and silica sol accounting for 15-5%. Step 3: Collect the fibers and perform a needle punching process to produce the inorganic refractory fiber, which has extensibility and elasticity.

[0009] Furthermore, the annular seal has a countersunk hole at the center of one end near the limiting member, which corresponds to the limiting member. When the wall-penetrating pipe moves outward in a hot state, the limiting member enters the countersunk hole and then presses against the annular seal.

[0010] Furthermore, the annular seal is assembled from two semi-circular inorganic refractory fiber blocks, with an arc-shaped groove in the center of each semi-circular inorganic refractory fiber block, and the two arc-shaped grooves combined to form a countersunk hole.

[0011] Furthermore, the number of the annular seals is two. Each annular seal is assembled from two semi-circular inorganic refractory fiber blocks. The two annular seals abut against each other and the joints of the semi-circular rings are staggered. The annular seal closer to the furnace wall fits and abuts against the inner side of the furnace wall. The annular seal farther from the furnace wall has a through groove in the center corresponding to the limiting component. The through groove and the end of the annular seal closer to the furnace wall form a countersunk hole.

[0012] Furthermore, the limiting member consists of inorganic refractory fibers wrapped around the outer edge of the through-wall pipe and multiple strands of stainless steel wire tied around the outer ring of the inorganic refractory fibers. The inorganic refractory fibers are fixed to the outer edge of the through-wall pipe by the multiple strands of tightly tied stainless steel wire.

[0013] Furthermore, a limiting ring is fixedly provided on the outer edge of the through-wall pipe on the side of the limiting member away from the furnace wall.

[0014] Furthermore, the outer sealing element consists of inorganic refractory fibers wrapped around the outer edge of the through-wall pipe and multiple strands of stainless steel wire tied around the outer ring of the inorganic refractory fibers. The inorganic refractory fibers are fixed to the outer edge of the through-wall pipe by the multiple strands of tightly tied stainless steel wire.

[0015] Furthermore, a second limiting ring is fixedly provided on the outer edge of the through-wall pipe on the side of the outer seal that is away from the furnace wall.

[0016] Compared with the prior art, the advantages of this utility model are: By setting up an inorganic refractory fiber annular seal with a certain degree of extensibility and elasticity that fits against the inner side of the furnace wall, and cooperating with the outer seal, a static seal is achieved for the gap between the through-wall pipe and the furnace wall in the cold state. By combining form-fitting seals, limiting components, corrugated pipes, and inorganic refractory fiber plugging materials, dynamic sealing is achieved for the gap between the through-wall pipes and the furnace wall in the hot state, thus realizing heat insulation and smoke protection between the through-wall pipes of the waste heat boiler and the furnace wall. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention. Figure 2 for Figure 1 Front view, Figure 3 for Figure 2 The cross-sectional view of AA is also a schematic diagram of the present invention in its cold state. Figure 4 Is Figure 1 Based on this, a structural diagram after removing the bellows 7 is provided. Figure 5 Is Figure 4 Based on this, the structural diagram after further removing the limiting component 3, the annular seal 4, and the limiting retaining ring 9 is shown. Figure 6 This is a structural schematic diagram of one embodiment of the limiting member 3. Figure 7 This is a schematic diagram of one embodiment of the annular seal 4. Figure 8 A schematic diagram of a semi-circular inorganic refractory fiber block 41 with an arc-shaped groove 411 at its center. Figure 9 A schematic diagram of the annular seal 4 with a central groove 421. Figure 10 This is a schematic diagram of a single semi-circular inorganic refractory fiber block 41 assembled into a structure with a central through-groove 421. Figure 11 This is a schematic diagram showing the state of this utility model under thermal conditions. Figure 12 This is a schematic diagram comparing the states of this utility model in hot and cold states. The attached figures are labeled as follows: Furnace wall 1, through-wall pipe 2, limiting component 3, annular seal 4, inorganic refractory fiber block 41, arc groove 411, countersunk hole 42, through groove 421, limiting ring 5, outer seal 6, corrugated pipe 7, inorganic refractory fiber plugging material 8, limiting retaining ring one 9, limiting retaining ring two 10, gap 100. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please refer to Figures 1 to 12 This utility model provides a sealing and heat insulation structure for a waste heat boiler through-wall pipe, including a furnace wall 1, a through-wall pipe 2, a limiting component 3, an annular sealing component 4, an outer sealing component 6, and a corrugated pipe 7, wherein: The through-wall pipe 2 vertically penetrates the furnace wall 1. The furnace wall 1 has a structural hole for the through-wall pipe 2 to pass through. If the furnace wall 1 is horizontal, the through-wall pipe 2 is vertical; if the furnace wall 1 is vertical, the through-wall pipe 2 is horizontal. Generally, the structural hole is circular. Because the through-wall pipe 2 will experience small-range displacements in all directions during equipment operation, including axial outward displacement and irregular circumferential displacement, the inner diameter of the structural hole is slightly larger than the outer diameter of the through-wall pipe 2. Therefore, a gap of 100mm exists between the through-wall pipe 2 and the furnace wall 1. Figure 5 Therefore, the gap 100 needs to be sealed to insulate against heat and smoke, prevent smoke leakage and heat loss, and also prevent the smoke from corroding the outer wall of the furnace wall 1 and nearby cable trays and other equipment. This invention uses appropriately designed components such as limiting parts 3, annular seals 4, outer seals 6, and corrugated pipes 7 to statically and dynamically seal the gap between the furnace wall 1 and the through-wall pipe 2. Specifically... The limiting component 3 is fixedly installed on the outer edge of the through-wall pipe 2, and it is located inside the waste heat boiler, such as... Figures 1 to 3 ; The annular seal 4 is positioned between the limiting member 3 and the furnace wall 1, with one side slidingly fitting against the inner side of the furnace wall 1 to seal the gap 100. Figure 2 and Figure 3 The annular seal 4 is made of refractory material with ductility and elasticity. The refractory temperature rating is determined according to actual needs. Its inner ring slides and fits with the through-wall pipe 2, and the outer ring is provided with a limiting ring 5. The outer diameter of the annular seal 4 is larger than the inner diameter of the structural hole on the furnace wall 1. It can ensure that when the through-wall pipe 2 undergoes dynamic displacement, the annular seal 4 can always cover the gap 100 during the movement process, maintaining the closed state of the gap 100, so as to achieve static and dynamic sealing of the inner side of the furnace wall 1.

[0025] To ensure a good sealing effect, the annular seal 4 of this utility model uses a refractory material with ductility and elasticity. Through cooperation with the limiting member 3 and the outer seal 6, a better sealing effect is achieved. Specifically: In the cold state, it is static. A static seal is achieved by the annular seal 4 fitting against the inner side of the furnace wall 1, and the outer seal 6 sealing the gap 100 from the outside. Figure 3 ; In the hot state, the wall-penetrating pipe 2 is dynamic. It will initially undergo axial displacement outwards. Until it returns to its cold state, the wall-penetrating pipe 2 will not return to its original position and will always have an outward displacement. Figure 11 As the through-wall pipe 2 moves outward, the limiting member 3 moves in tandem with the annular seal 4 and squeezes the annular seal 4, causing the annular seal 4 to fit more tightly against the inner side of the furnace wall 1. Furthermore, due to the extensibility and elasticity of the annular seal 4, and with the restriction of the limiting ring 5, the outer ring of the annular seal 4 will not expand. When compressed by external force, the annular seal 4 will deform, and its thickness will become thinner accordingly. Its own fiber structure will become more compact, and its inner ring will fit more tightly against the through-wall pipe 2. Under hot conditions, the through-wall pipe 2 will also have circumferential displacement. If the through-wall pipe 2 does not reset, there will always be outward displacement. The pressure of the limiting part 3 on the annular seal 4 will always exist. Then the annular seal 4 will always be tightly attached to the inner side of the furnace wall 1 to seal the gap 100, thereby achieving dynamic sealing of the gap 100. According to the requirements of fire resistance rating, there are specific specifications for the thickness of the annular seal 4. In addition, the annular seal 4 will undergo a certain deformation when it is squeezed. If the thickness of the annular seal 4 is insufficient, it cannot meet the sealing requirements. Therefore, the thickness of the annular seal 4 of this utility model is not less than 100 mm. In practical applications, such as Figure 12 In the cold state, the distance between the other end of the annular seal 4 and the limiting member 3 is L mm. In the hot state, the outward displacement of the through-wall pipe 2 is S mm, and the extrusion deformation of the thickness of the annular seal 4 is Δt mm. The following conditions must be met: S = L + Δt. Only when the relationship S = L + Δt is met can the optimal dynamic sealing effect be achieved.

[0026] In the preferred embodiment, the annular seal 4 of this utility model is made of inorganic refractory fiber, which is the applicant's own product. It is described and explained in the invention patent with publication number CN116334856B, and its preparation steps include: Step 1: Weigh the raw materials according to the following proportions: 33-48 parts alumina, 45-60 parts silicon dioxide, and 0.1-1 parts additives. Mix and melt the raw materials according to the proportions. Step 2: The molten raw material is spun into fibers. At the same time as spun, an additive is sprayed onto the fibers in a spraying manner through a material addition device. The additive consists of cocoyl diethanolamide and silica sol, with cocoyl diethanolamide accounting for 85-95% and silica sol accounting for 15-5%. Step 3: Collect the fibers and perform a needle punching process to produce inorganic refractory fibers, which have extensibility and elasticity; According to the actual fire resistance requirements, the prepared inorganic refractory fibers are cut into the required size and then processed into inorganic refractory fiber materials with corresponding density (corresponding to the fire resistance grade) through a compression process. The density and fire resistance grade have a corresponding relationship. For example, a density of 260-280 kg / m³ corresponds to a temperature resistance grade of 1480℃.

[0027] In a preferred embodiment, a countersunk hole 42 corresponding to the limiting member 3 is provided at the center of one end of the annular seal 4 near the limiting member 3, such as... Figure 7 The inner diameter of the countersunk hole 42 is slightly larger than the outer diameter of the limiting member 3. Under hot conditions, the through-wall pipe 2 moves outward, and the limiting member 3 enters the countersunk hole 42, where it is then pressed against the annular seal 4. Figure 11 The limiting member 3 presses against the bottom of the countersunk hole 42 to squeeze the annular seal 4. This setting can meet the fire resistance rating requirements for the thickness of the annular seal 4, while also saving materials and reducing costs to a certain extent. With the countersunk hole 42 structure, the distance between the limiting member 3 and the bottom of the countersunk hole 42 is L mm. From the perspective of convenient installation, the annular seal 4 of this utility model adopts a structure of two semi-circular inorganic refractory fiber blocks 41 assembled together. Since the through-wall pipe 2 is an existing structure, and the annular seal 4 is not pre-installed, it is difficult to fit the closed-loop annular seal 4 onto the through-wall pipe 2. By assembling the two semi-circles, and then using a limiting ring 5 to limit and fix the outer ring, installation is convenient. Note that the limiting ring 5 is also achieved on-site by winding and binding to limit the outer ring of the assembled annular seal 4. A multi-strand thin, flat, high-temperature resistant metal strip with a certain width can be used to wind and bind the outer ring of the annular seal 4 to form the limiting ring 5 structure. High-temperature resistant metal strips are mature products and can be purchased commercially or customized according to temperature rating and size requirements. If a countersunk hole 42 structure is set, a corresponding arc-shaped groove 411 is provided in the center of each semi-circular inorganic refractory fiber block 41. Figure 8 Two arc grooves 411 are combined to form a countersunk hole 42.

[0028] Given that the annular seal 4 uses the applicant's own inorganic refractory fiber product, and for the purpose of protecting the annular seal 4, the main body of the limiting member 3 also uses the same inorganic refractory fiber material, such as... Figure 6Specifically, the limiting component 3 consists of inorganic refractory fiber wrapped around the outer edge of the through-wall pipe 2 and multiple strands of stainless steel wire tied around the outer ring of the inorganic refractory fiber. The inorganic refractory fiber is fixed to the outer edge of the through-wall pipe 2 by the multiple strands of stainless steel wire, forming a limiting component 3 that compresses the annular seal 4. In this way, the annular seal 4 will not be damaged due to the material of the limiting component 3 being too hard during the compression process.

[0029] To ensure the stable positioning of the limiting component 3, a limiting ring 9 is fixedly installed on the outer edge of the through-wall pipe 2, on the side of the limiting component 3 away from the furnace wall 1, to limit the positioning of the limiting component 3.

[0030] In addition, the structure of the annular seal 4 assembled from two semi-circular inorganic refractory fiber blocks 41 involves the two semi-circular inorganic refractory fiber blocks 41 being joined together in a mutually abutting manner. After being compressed, the two semi-circular inorganic refractory fiber blocks 41 will abut even more tightly, ensuring the sealing effect on the gap 100. To further ensure the sealing effect, in actual installation, a structure of two annular seals 4 stacked together is adopted. The two annular seals 4 abut each other and the splicing seams are staggered. The annular seal 4 closer to the furnace wall 1 is in close contact with the inner side of the furnace wall 1. Under hot conditions, the annular seal 4 closer to the limiting member 3 abuts against the limiting member 3 and is compressed. The two annular seals 4, the annular seal 4 and the furnace wall 1, and the annular seal 4 and the through-wall pipe 2 are all tightly fitted to achieve dynamic sealing of the gap 100. If a countersunk hole 42 structure is provided, a through groove 421 corresponding to the limiting member 3 is provided in the center of the annular seal 4 away from the furnace wall 1. Figure 9 and Figure 10 The through groove 421 forms a countersunk hole 42 with the end of the annular seal 4 near the furnace wall 1.

[0031] The outer sealing element 6 is located outside the waste heat boiler. It is fixedly installed on the outer edge of the through-wall pipe 2, and in the cold state, it fits tightly against the outer side of the furnace wall 1 to seal the gap 100. Figure 2 and Figure 3 In the hot state, the through-wall pipe 2 moves outward, and the outer sealing element 6 moves away from the furnace wall 1 and does not participate in the dynamic sealing of the gap 100. As a preferred method, the outer sealing element 6 also adopts the same structure and material as the limiting element 3. Specifically, the outer sealing element 6 is composed of inorganic refractory fiber wrapped around the outer edge of the through-wall pipe 2 and multiple strands of stainless steel wire tied around the outer ring of the inorganic refractory fiber. The inorganic refractory fiber is fixed to the outer edge of the through-wall pipe 2 by the multiple strands of tightly tied stainless steel wire.

[0032] Similarly, in order to ensure the stable positioning of the outer seal 6, a limiting ring 2 10 is also fixed on the outer edge of the through pipe 2 on the side of the outer seal 6 away from the furnace wall 1 to limit the outer seal 6.

[0033] The corrugated pipe 7 is fitted around the wall-penetrating pipe 2 and the outer sealing element 6. One end of the corrugated pipe 7 is fixed to the outside of the furnace wall 1. The free end of the corrugated pipe 7 and the wall-penetrating pipe 2 are filled with inorganic refractory fiber sealant 8. The free end of the corrugated pipe 7 and the inorganic refractory fiber sealant 8 are fixedly connected. The outer diameter of the outer sealing element 6 is smaller than the inner diameter of the corrugated pipe 7. The corrugated pipe 7 cannot restrict the freedom of the outer sealing element 6. There should be sufficient space between the outer sealing element 6 and the corrugated pipe 7.

[0034] The inorganic refractory fiber sealant 8 must seal the corrugated pipe 7 and the through-wall pipe 2 tightly. Under tight sealing conditions, the inorganic refractory fiber sealant 8 and the corrugated pipe 7 can be either a sliding seal or a fixed seal. During sliding sealing, the inorganic refractory fiber plug 8 should not restrict the external sealing element 6. When the through-wall pipe 2 moves outward, the external sealing element 6 should have sufficient displacement space and should not come into contact with the inorganic refractory fiber plug 8. When the through-wall pipe 2 moves circumferentially, the inorganic refractory fiber plug 8 and the free end of the corrugated pipe 7 should move together. The corrugated pipe 7 should bend to adapt to the circumferential displacement of the through-wall pipe 2. When the sealing is fixed, the above factors do not need to be considered. When the through-wall pipe 2 moves outward, it causes the inorganic refractory fiber plug 8 and the free end of the corrugated pipe 7 to move outward. The corrugated pipe 7 deforms in the length direction to adapt to the outward displacement of the through-wall pipe 2. When the through-wall pipe 2 moves circumferentially, the inorganic refractory fiber plug 8 and the free end of the corrugated pipe 7 move accordingly. The corrugated pipe 7 bends to adapt to the circumferential displacement of the through-wall pipe 2.

[0035] Working principle: In the cold state, when the equipment is not running, the through-wall pipe 2 does not experience outward or circumferential displacement. This utility model achieves static sealing through the following means: By having the annular sealing element 4 adhere to the inner side of the furnace wall 1 and the outer sealing element 6 adhere to the outer side of the furnace wall 1, the gap 100 is sealed to achieve static sealing. When the equipment is in operation, the through-wall pipe 2 will undergo outward and circumferential displacement. This invention achieves dynamic sealing through the following means: The through-wall pipe 2 moves outward axially, and the limiting member 3 moves accordingly. The limiting member 3 will squeeze the annular seal 4, causing the annular seal 4 to fit more tightly with the inner side of the furnace wall 1 and the inner ring with the through-wall pipe 2. Furthermore, due to the extensibility and elasticity of the annular seal 4, and with the restriction of the limiting ring 5, the outer ring of the annular seal 4 will not expand. When squeezed by external force, its own fiber structure will become more compact. When the through-wall pipe 2 undergoes circumferential displacement, the outward displacement of the through-wall pipe 2 still exists. The limiting component 3 always presses against the annular seal 4, so the annular seal 4 will always be tightly fitted to the inner side of the furnace wall 1 to seal the gap 100, thereby achieving dynamic sealing of the gap 100. Although the outer sealing element 6 on the outside of the furnace wall 1 does not have a closed gap 100, the combination of the corrugated pipe 7 and the inorganic refractory fiber plugging material 8 can still achieve dynamic sealing on the outside of the furnace wall 1.

[0036] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A sealing and heat-insulating structure for a waste heat boiler through-wall pipe, comprising a furnace wall (1) and a through-wall pipe (2), wherein the through-wall pipe (2) vertically penetrates the furnace wall (1), and a gap (100) exists between the furnace wall (1) and the through-wall pipe (2), characterized in that, Also includes: A limiting component (3) is fixedly installed on the outer edge of the through-wall pipe (2) and located inside the waste heat boiler; An annular seal (4) is installed between the limiting member (3) and the furnace wall (1). One end of the annular seal (4) is fitted to the inner side of the furnace wall (1) to seal the gap (100). The annular seal (4) is made of refractory material with ductility and elasticity. Its inner ring is fitted to the through pipe (2) and its outer ring is provided with a limiting ring (5). The thickness of the annular seal (4) is not less than 100 mm. The limiting member (3) is pressed against the annular seal (4) in the hot state. An outer sealing element (6) is fixedly installed on the outer edge of the through-wall pipe (2) and fits against the outside of the furnace wall (1) in a cold state to seal the gap (100); A corrugated pipe (7) is fitted around the through-wall pipe (2) and the outer sealing element (6). One end of the corrugated pipe (7) is fixed to the outside of the furnace wall (1). The outer diameter of the outer sealing element (6) is smaller than the inner diameter of the corrugated pipe (7). The free end of the corrugated pipe (7) and the through-wall pipe (2) are filled with inorganic refractory fiber plugging material (8).

2. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 1, characterized in that, The distance between the other end of the annular seal (4) and the limiting member (3) is L mm. Under hot conditions, the outward displacement of the through-wall pipe (2) is S mm. The extrusion deformation of the thickness of the annular seal (4) is Δt mm, which satisfies: S = L + Δt.

3. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 2, characterized in that, The annular seal (4) is made of inorganic refractory fiber, and its preparation steps include: Step 1: Weigh the raw materials according to the following proportions: 33-48 parts alumina, 45-60 parts silicon dioxide, and 0.1-1 parts additives. Mix and melt the raw materials according to the proportions. Step 2: The molten raw material is spun into fibers. At the same time as spun, an additive is sprayed onto the fibers in a spraying manner through a material addition device. The additive consists of cocoyl diethanolamide and silica sol, with cocoyl diethanolamide accounting for 85-95% and silica sol accounting for 15-5%. Step 3: Collect the fibers and perform a needle punching process to produce the inorganic refractory fiber, which has extensibility and elasticity.

4. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 3, characterized in that, The annular seal (4) has a countersunk hole (42) at the center of one end near the limiting member (3) that corresponds to the limiting member (3). When the wall-penetrating pipe (2) moves outward in the hot state, the limiting member (3) enters the countersunk hole (42) and then presses against the annular seal (4).

5. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 4, characterized in that, The annular seal (4) is assembled from two semi-circular inorganic refractory fiber blocks (41). Each semi-circular inorganic refractory fiber block (41) has an arc groove (411) in the center, and the two arc grooves (411) are combined to form a countersunk hole (42).

6. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 4, characterized in that, The number of the annular seals (4) is two. Each annular seal (4) is assembled from two semi-circular inorganic refractory fiber blocks (41). The two annular seals (4) abut against each other and the splicing seams of the semi-circular rings are staggered. The annular seal (4) closer to the furnace wall (1) fits against the inner side of the furnace wall (1). The annular seal (4) farther from the furnace wall (1) has a through groove (421) in the center that corresponds to the limiting member (3). The through groove (421) and the end of the annular seal (4) closer to the furnace wall (1) form a countersunk hole (42).

7. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 3, characterized in that, The limiting component (3) consists of inorganic refractory fiber wrapped around the outer edge of the through-wall pipe (2) and multiple strands of stainless steel wire tied around the outer ring of the inorganic refractory fiber. The inorganic refractory fiber is fixed to the outer edge of the through-wall pipe (2) by the multiple strands of stainless steel wire.

8. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 7, characterized in that, A limiting ring (9) is also fixed on the outer edge of the through-wall pipe (2) on the side away from the furnace wall (1) from the limiting member (3).

9. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 3, characterized in that, The outer sealing element (6) consists of inorganic refractory fiber wrapped around the outer edge of the through-wall pipe (2) and multiple strands of stainless steel wire tied around the outer ring of the inorganic refractory fiber. The inorganic refractory fiber is fixed to the outer edge of the through-wall pipe (2) by the multiple strands of stainless steel wire.

10. The sealing and heat insulation structure for waste heat boiler through-wall pipes according to claim 9, characterized in that, The wall-penetrating pipe (2) is also fixedly provided with a limiting ring (10) on the side of the outer sealing element (6) away from the furnace wall (1).

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