Anti-corrosion structure for chimney ring beam and expansion joint

Abstract

The invention discloses an anti-corrosion structure of a chimney ring beam and an expansion joint. The anti-corrosion structure of the ring beam sequentially comprises a ring beam interface agent layer, a ring beam first anti-corrosion glue layer, a ring beam first glass fiber cloth layer, a ring beam second anti-corrosion glue layer, a ring beam second glass fiber cloth layer, a ring beam third anti-corrosion glue layer and a ring beam third glass fiber cloth layer from the inner layer to the outer layer. The expansion joint anti-corrosion structure sequentially comprises an expansion joint interface agent layer, an expansion joint first anti-corrosion adhesive layer, an expansion joint first waterproof acid-resistant coiled material layer, an expansion joint second anti-corrosion adhesive layer, an expansion joint second waterproof acid-resistant coiled material layer, an expansion joint third anti-corrosion adhesive layer and an expansion joint glass fiber cloth layer from the inner layer to the outer layer. The chimney ring beam and the expansion joint area are subjected to anti-corrosion treatment, the inner wall of the chimney is prevented from being corroded by flue gas acid liquor through the polyurethane modified asphalt adhesive and the polytetrafluoroethylene, and the anti-permeation performance, the anti-corrosion performance, the high temperature resistance, the wear resistance and the telescopic performance of the anti-corrosion structure are greatly improved through the light vitrified ceramic tiles and the acid-resistant glass fiber cloth.

Description

Technical Field

[0001] The present invention relates to chimney anti-corrosion technology, and more particularly to an anti-corrosion structure for a chimney ring beam and an expansion joint. Background Art

[0002] Industrial chimneys are widely used in power plants, coal chemical plants, and heating systems. For example, CN 215563834U discloses a steel platform ring beam for sleeve chimneys and its application structure. Industrial chimneys are large in diameter and height. Using a complete straight-tube structure can easily lead to cracking, deformation, and even collapse. Therefore, most common industrial chimneys are composed of multiple stacked sections. These chimneys primarily consist of an inner tube, an outer tube, and a ring beam. The inner tube is a multi-segment straight-tube smoke exhaust structure, while the outer tube is typically a load-bearing steel structure. The ring beam is circular and connected to the outer tube via a support structure. The ring beam is positioned between the two inner tubes at either end, with the bottom of each inner tube segment fixedly connected to the corresponding ring beam. To prevent compression deformation between adjacent inner tube segments due to thermal expansion and contraction, the connection between the inner tube and the ring beam cannot be rigidly connected. Therefore, a gap exists between the top of the inner tube and the ring beam, serving as an expansion joint.

[0003] In practice, to meet environmental protection requirements, wet flue gas desulfurization (FGD) is often used in existing technologies to treat flue gas. However, the flue gas treated with wet FGD has a high moisture content, a low temperature, and contains hydrogen fluoride, chlorides, and sulfurous acid. The flue gas acid dew point is typically between 140-160°C. When the flue gas temperature is lower than the flue gas acid dew point, severe condensation forms on the chimney's inner walls. The condensed acid then flows along the inner tube wall. Due to its highly corrosive nature, the acid causes corrosion wherever it passes. The high-speed flow of flue gas and the particulate matter it carries with it wears the chimney's inner wall, further exacerbating the corrosion process. Corrosion is most severe in the chimney's expansion joints due to their irregular shape. Furthermore, stress concentration in the ring beam and contraction joint areas makes the corroded inner tube most susceptible to surface shedding. Furthermore, the irregular ring beam structure makes it difficult to achieve integrated corrosion protection, making it prone to further leakage or shedding of the anti-corrosion layer, leading to further corrosion of the chimney's inner tube.

[0004] Existing technologies for chimney corrosion prevention include foam glass bricks, titanium-steel composite plates, fiber-wound reinforcements, and heavy-duty anti-corrosion coatings. Among these, foam glass bricks are susceptible to construction artifacts, reducing the chimney's inner cross-sectional area and increasing its overall load-bearing capacity. Titanium-steel composite plates are difficult and expensive to construct. Fiber-wound reinforcements, however, suffer from significant variations in resin materials and pose a fire hazard. Heavy-duty anti-corrosion coatings are prone to adhesion issues with the substrate and are highly dependent on construction methods and quality.

[0005] In order to solve the anti-corrosion problem of chimney ring beam and its expansion joint, the present invention is proposed. Summary of the Invention

[0006] The present invention overcomes the deficiencies of the prior art and provides an implementation method of an anti-corrosion structure for a chimney ring beam and an expansion joint, in the hope of solving the problem that the chimney ring beam and its contraction joint cannot be effectively anti-corroded due to their irregular shapes.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A corrosion-resistant structure for a chimney ring beam and expansion joint, comprising a ring beam corrosion-resistant structure for wrapping the inner surface of the ring beam and an expansion joint corrosion-resistant structure for filling the expansion joint, wherein the ring beam corrosion-resistant structure comprises, from inner to outer layers, a ring beam interface agent layer, a first ring beam corrosion-resistant adhesive layer, a first ring beam glass fiber cloth layer, a second ring beam corrosion-resistant adhesive layer, a second ring beam glass fiber cloth layer, a third ring beam corrosion-resistant adhesive layer, and a third ring beam glass fiber cloth layer; and the expansion joint corrosion-resistant structure comprises, from inner to outer layers, an expansion joint interface agent layer, a first expansion joint corrosion-resistant adhesive layer, a first expansion joint waterproof and acid-resistant coiled material layer, a second expansion joint corrosion-resistant adhesive layer, a second expansion joint waterproof and acid-resistant coiled material layer, a third expansion joint corrosion-resistant adhesive layer, and an expansion joint glass fiber cloth layer.

[0009] Optionally: the anti-corrosion structure further includes a pressure edge system above the ring beam, and the pressure edge system includes, from the inner layer to the outer layer, a first pressure edge anti-corrosion adhesive layer and a lightweight vitrified brick layer.

[0010] Optionally, the outer surfaces of the ring beam anti-corrosion structure, the expansion joint anti-corrosion structure, and the edge pressing system are entirely coated with a sealing layer.

[0011] Optional: The ring beam interface agent layer and the expansion joint interface agent layer are high temperature resistant epoxy primers.

[0012] Optionally, the first glass fiber cloth layer of the ring beam, the second glass fiber cloth layer of the ring beam, the third glass fiber cloth layer of the ring beam, and the expansion joint glass fiber cloth layer are acid-resistant glass fiber cloth.

[0013] Optionally, the waterproof and acid-resistant coiled material of the first waterproof and acid-resistant coiled material layer and the second waterproof and acid-resistant coiled material layer is made of polytetrafluoroethylene material.

[0014] Optional: the first anti-corrosion rubber layer of the ring beam, the second anti-corrosion rubber layer of the ring beam, the third anti-corrosion rubber layer of the ring beam, the first anti-corrosion rubber layer of the expansion joint, the second anti-corrosion rubber layer of the expansion joint, the third anti-corrosion rubber layer of the expansion joint, the first anti-corrosion rubber layer of the pressure edge, and the sealing layer are all polyurethane modified asphalt adhesives.

[0015] Optional: The lightweight vitrified tile layer is a lightweight vitrified ceramic tile.

[0016] Optionally, the first glass fiber cloth layer of the ring beam, the first glass fiber cloth layer of the ring beam, and adjacent layers of the first glass fiber cloth layer of the ring beam are pasted in a direction orthogonal to the fabric grain.

[0017] Optionally, the upper and lower surfaces of the lightweight vitrified tile layer are triangularly coated with polyurethane modified asphalt adhesive.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention performs anti-corrosion treatment on the chimney ring beam and expansion joint area, and avoids the corrosion of the chimney inner wall by flue gas acid liquid through the acid liquid penetration resistance, elasticity and mechanical strength of polyurethane modified asphalt adhesive and polytetrafluoroethylene. The mechanical reinforcement and high temperature resistance of inorganic lightweight vitrified ceramic tiles and acid-resistant glass fiber cloth greatly enhance the anti-penetration, anti-corrosion, high temperature resistance, wear resistance and expansion resistance of the entire anti-corrosion structure, and can better avoid the corrosion and penetration of acid liquid into the anti-corrosion substrate, without changing the original functions of the ring beam and expansion joint, ensuring that the anti-corrosion structure can operate for a long time under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structural position of the present invention; Figure 1 The right side is the outer layer of the ring beam anti-corrosion structure and the outer layer of the expansion joint anti-corrosion structure;

[0020] The serial numbers in the figure are: 1. Ring beam anti-corrosion structure; 2. Expansion joint anti-corrosion structure; 3. Edge pressing system. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] The present invention is to carry out anti-corrosion and edge pressing on the ring beam area and expansion joint area of ​​the chimney to prevent acid liquid after condensation from corroding the inner wall of the chimney.

[0023] Example 1

[0024] Figure 1A cross-section of the chimney's inner tube, the ring beam, and the anti-corrosion structure at the ring beam location is shown. A chimney ring beam and expansion joint anti-corrosion structure is described. The ring beam anti-corrosion structure is an anti-corrosion layer that protects the chimney ring beam, which supports the chimney. The ring beam anti-corrosion structure 1, from inner to outer layers (left is inner, right is outer), includes a ring beam interface agent layer, a first ring beam anti-corrosion adhesive layer, a first ring beam fiberglass cloth layer, a second ring beam anti-corrosion adhesive layer, a second ring beam fiberglass cloth layer, a third ring beam anti-corrosion adhesive layer, and a third ring beam fiberglass cloth layer. The expansion joint anti-corrosion structure 2 is an anti-corrosion layer that protects the expansion joint between the upper and lower chimney sections. The expansion joint prevents stress concentration between the two chimney sections. From the inner layer to the outer layer, the expansion joint anti-corrosion structure includes an expansion joint interface agent layer, a first expansion joint anti-corrosion adhesive layer, a first expansion joint waterproof and acid-resistant membrane layer, a second expansion joint anti-corrosion adhesive layer, a second expansion joint waterproof and acid-resistant membrane layer, a third expansion joint anti-corrosion adhesive layer, and a fiberglass fabric layer. The edge clamping system 3, located above and below the ring beam, protects the chimney's inner walls above and below the ring beam. The edge clamping system includes a first edge clamping adhesive layer and a lightweight vitrified tile layer. A sealing layer is also applied to the upper surfaces of the ring beam anti-corrosion structure, the expansion joint anti-corrosion structure, and the edge clamping system. Each layer fits tightly together to form a solid anti-corrosion layer.

[0025] Among them, the ring beam interface agent layer and the expansion joint interface agent layer are high-temperature resistant epoxy primers and can be used under 150°C conditions; the first glass fiber cloth layer of the ring beam, the second glass fiber cloth layer of the ring beam, the third glass fiber cloth layer of the ring beam, and the expansion joint glass fiber cloth layer are acid-resistant glass fiber cloth, and the thickness of the acid-resistant glass fiber cloth is 0.18mm; the first waterproof and acid-resistant membrane layer and the second waterproof and acid-resistant membrane layer are made of polytetrafluoroethylene material; the lightweight vitrified tile layer is a lightweight vitrified ceramic tile, which plays a role in thermal insulation, with a density of ≤1.35g / cm³ and a brick thickness of 50mm; the first anti-corrosion adhesive layer of the ring beam, the second anti-corrosion adhesive layer of the ring beam, the third anti-corrosion adhesive layer of the ring beam, the first anti-corrosion adhesive layer of the expansion joint, the second anti-corrosion adhesive layer of the expansion joint, the third anti-corrosion adhesive layer of the expansion joint, the first anti-corrosion adhesive layer of the pressure edge, and the sealing layer are all polyurethane modified asphalt adhesives, with an elongation greater than or equal to 100%, good elasticity and sealing properties, and there are no bubbles inside the colloid after mixing.

[0026] The specific construction method includes the following steps:

[0027] Step 1: Clean the ring beam and expansion joints. Use electric grinding, high-pressure water guns and other equipment to perform comprehensive and thorough cleaning and cleaning. Grind away scum, oil stains and other crystalline impurities on the inner wall surface to make the chimney inner wall smooth, clean, firm and dense, and then dry.

[0028] Step 2: evenly apply epoxy primer on the surface of the ring beam and the inner surface of the expansion joint to form a ring beam interface agent layer and an expansion joint interface agent layer with a coating thickness of 70 μm;

[0029] Step 3: Apply polyurethane modified asphalt adhesive on the surface of the ring beam interface layer as the first anti-corrosion adhesive layer of the ring beam, ensuring that there are no bubbles inside the adhesive and applying it evenly. The thickness of the adhesive layer is 2 mm.

[0030] Step 4: vertically adhere acid-resistant glass fiber cloth to the surface of the first anti-corrosion adhesive layer of the ring beam as the first glass fiber cloth layer of the ring beam, ensuring that the acid-resistant glass fiber cloth has no bubbles, hollows, etc.;

[0031] Step 5: Apply polyurethane modified asphalt adhesive on the surface of the first glass fiber cloth layer of the ring beam as the second anti-corrosion adhesive layer of the ring beam, ensuring that there are no bubbles inside the adhesive and applying it evenly. The thickness of the adhesive layer is 1.5 mm.

[0032] Step 6: Paste acid-resistant glass fiber cloth horizontally on the surface of the second anti-corrosion adhesive layer of the ring beam as the second glass fiber cloth layer of the ring beam, ensuring that the acid-resistant glass fiber cloth has no bubbles, hollows, etc.;

[0033] Step 7: Apply polyurethane modified asphalt adhesive on the surface of the second glass fiber cloth layer of the ring beam as the third anti-corrosion adhesive layer of the ring beam, ensuring that there are no bubbles inside the adhesive and applying it evenly. The thickness of the adhesive layer is 1.5 mm.

[0034] Step 8: Paste acid-resistant glass fiber cloth horizontally on the surface of the third anti-corrosion adhesive layer of the ring beam as the third glass fiber cloth layer of the ring beam, ensuring that the acid-resistant glass fiber cloth has no bubbles, hollows, etc.;

[0035] Step 9: Apply polyurethane modified asphalt adhesive on the surface of the expansion joint interface layer as the first anti-corrosion adhesive layer of the expansion joint, ensuring that there are no bubbles inside the colloid and applying it evenly. The thickness of the adhesive layer is 1mm.

[0036] Step 10: Paste a polytetrafluoroethylene membrane on the surface of the first anti-corrosion adhesive layer as the first waterproof and acid-resistant membrane layer of the expansion joint. Before pasting, cut the membrane to ensure that the size of the membrane matches the expansion joint and the groove, and ensure that the membrane tightly wraps the expansion joint groove;

[0037] Step 11: Apply a polyurethane modified asphalt adhesive on the surface of the first waterproof and acid-resistant membrane layer as the second anti-corrosion adhesive layer for the expansion joint, ensuring that there are no bubbles inside the colloid and applying it evenly to ensure that the anti-corrosion adhesive completely fills the gap in the expansion joint without defects such as bubbles and cavities, and that the colloid completely fills the expansion joint;

[0038] Step 12: Paste a polytetrafluoroethylene membrane on the surface of the second anti-corrosion adhesive layer of the expansion joint as the second waterproof and acid-resistant membrane layer of the expansion joint. Before pasting, cut the membrane to ensure that the size of the membrane matches the expansion joint and the groove, ensure that the membrane tightly wraps the expansion joint groove, and fix the membrane flanges on the upper and lower sides of the expansion joint to further enhance the isolation effect.

[0039] Step 13: Apply polyurethane modified asphalt adhesive on the surface of the second waterproof and acid-resistant membrane layer of the expansion joint as the third anti-corrosion adhesive layer of the expansion joint, ensuring that there are no bubbles inside the adhesive and applying it evenly. The thickness of the adhesive layer is 2 mm.

[0040] Step 14: Paste acid-resistant glass fiber cloth on the surface of the third anti-corrosion adhesive layer of the expansion joint as the expansion joint glass fiber cloth layer, ensuring that the expansion joint glass fiber cloth layer has no bubbles, hollows, etc.;

[0041] Step 15: Construction of the edge pressing system: Apply polyurethane modified asphalt adhesive as the first anti-corrosion adhesive layer in the area 650mm above the ring beam, ensuring that there are no bubbles inside the adhesive and applying it evenly. The adhesive layer thickness is 1.5mm.

[0042] Step 16: Paste lightweight vitrified ceramic tiles on the surface of the first anti-corrosion adhesive layer as a lightweight vitrified tile layer, and paste the lightweight vitrified ceramic tiles in a two vertical and one horizontal manner so that they are tightly combined with the lower first anti-corrosion adhesive layer.

[0043] Step 17, construction of the sealing layer. After the ring beam area, expansion joint area, and edge pressing system are completed, a triangular coating is made on the upper and lower surfaces of the lightweight vitrified tile layer using polyurethane modified asphalt adhesive to completely cover the vitrified ceramic tiles and form a slope to prevent acid accumulation. At the same time, polyurethane modified asphalt adhesive is applied as a sealing layer to the three areas as a whole to ensure that there are no bubbles inside the colloid and the application is uniform. The adhesive layer thickness is 2.0mm.

[0044] Example 2

[0045] This embodiment is basically the same as embodiment 1, except for the arrangement of the layered structures. The specific contents are as follows:

[0046] The construction method includes the following steps:

[0047] Step 1: Clean the ring beam and expansion joints. Use electric grinding, high-pressure water guns and other equipment to perform comprehensive and thorough cleaning and cleaning. Grind away scum, oil stains and other crystalline impurities on the inner wall surface to make the chimney inner wall smooth, clean, firm and dense, and then dry.

[0048] Step 2: evenly apply epoxy primer on the surface of the ring beam and the inner surface of the expansion joint to form a ring beam interface agent layer and an expansion joint interface agent layer with a coating thickness of 70 μm;

[0049] Step 3: Apply polyurethane modified asphalt adhesive on the surface of the ring beam interface layer as the first anti-corrosion adhesive layer of the ring beam, ensuring that there are no bubbles inside the adhesive and applying it evenly. The thickness of the adhesive layer is 2 mm.

[0050] Step 4: Transversely paste acid-resistant glass fiber cloth on the surface of the first corrosion-resistant glue layer of the ring beam as the first glass fiber cloth layer of the ring beam, ensuring that the acid-resistant glass fiber cloth has no bubbles, hollowing and other phenomena;

[0051] Step 5: Apply polyurethane modified bitumen adhesive on the surface of the first glass fiber cloth layer of the ring beam as the second corrosion-resistant glue layer of the ring beam, ensuring that the glue has no bubbles inside, is evenly applied, and the glue layer is 1.5 mm thick;

[0052] Step 6: Vertically paste acid-resistant glass fiber cloth on the surface of the second corrosion-resistant glue layer of the ring beam as the second glass fiber cloth layer of the ring beam, ensuring that the acid-resistant glass fiber cloth has no bubbles, hollowing and other phenomena;

[0053] Step 7: Apply polyurethane modified bitumen adhesive on the surface of the second glass fiber cloth layer of the ring beam as the third corrosion-resistant glue layer of the ring beam, ensuring that the glue has no bubbles inside, is evenly applied, and the glue layer is 1.5 mm thick;

[0054] Step 8: Transversely paste acid-resistant glass fiber cloth on the surface of the third corrosion-resistant glue layer of the ring beam as the third glass fiber cloth layer of the ring beam, ensuring that the acid-resistant glass fiber cloth has no bubbles, hollowing and other phenomena;

[0055] Step 9: Apply polyurethane modified bitumen adhesive on the surface of the joint seal interface agent layer as the first corrosion-resistant glue layer of the joint seal, ensuring that the glue has no bubbles inside, is evenly applied, and the glue layer is 1 mm thick;

[0056] Step 10: Paste polytetrafluoroethylene coiled material on the surface of the first corrosion-resistant glue layer as the first waterproof acid-resistant coiled material layer of the joint seal. Before pasting, the coiled material is cut to ensure that the size of the coiled material matches the joint seal and the groove, and the coiled material tightly wraps the joint seal groove;

[0057] Step 11: Apply polyurethane modified bitumen adhesive on the surface of the first waterproof acid-resistant coiled material layer as the second corrosion-resistant glue layer of the joint seal, ensuring that the glue has no bubbles inside, is evenly applied, and the corrosion-resistant glue completely fills the joint gap without bubbles, hollows and other defects, and the glue completely fills the joint;

[0058] Step 12: Paste polytetrafluoroethylene coiled material on the surface of the second corrosion-resistant glue layer of the joint seal as the second waterproof acid-resistant coiled material layer of the joint seal. Before pasting, the coiled material is cut to ensure that the size of the coiled material matches the joint seal and the groove, and the coiled material tightly wraps the joint seal groove, and the coiled material is folded and fixed on the upper and lower edges of the joint seal to further enhance the isolation effect;

[0059] Step 13: Apply polyurethane modified bitumen adhesive on the surface of the second waterproof acid-resistant coiled material layer of the joint seal as the third corrosion-resistant glue layer of the joint seal, ensuring that the glue has no bubbles inside, is evenly applied, and the glue layer is 2 mm thick;

[0060] Step 14, paste acid-resistant glass fiber cloth on the surface of the third anticorrosive glue layer of the expansion joint as the glass fiber cloth layer of the expansion joint, to ensure that the glass fiber cloth layer of the expansion joint has no bubbles, hollowing and other phenomena;

[0061] Step 15, edge compression system construction, apply polyurethane modified bitumen adhesive in the area 650mm above the ring beam as the first anticorrosive glue layer of the edge compression system, to ensure that the glue has no bubbles inside, is evenly applied, and the glue layer has a thickness of 1.5mm;

[0062] Step 16, paste lightweight vitrified ceramic tiles on the surface of the first anticorrosive glue layer as the lightweight vitrified tile layer, and the lightweight vitrified ceramic tiles are pasted in a two-vertical-one-horizontal manner to tightly combine with the underlying first anticorrosive glue layer.

[0063] Step 17, sealant construction, after the completion of the ring beam area, the expansion joint area, and the edge compression system, apply polyurethane modified bitumen adhesive on the upper and lower surfaces of the lightweight vitrified tile layer to form a triangular covering, so that the vitrified ceramic tiles are completely covered and form a slope, which can prevent acid liquid from gathering. At the same time, apply polyurethane modified bitumen adhesive as a sealant in the three areas as a whole, to ensure that the glue has no bubbles inside, is evenly applied, and the glue layer has a thickness of 2.0mm.

[0064] Although the present application has been described herein with reference to the explanatory embodiments thereof, it should be understood that many other modifications and embodiments will occur to those skilled in the art upon reading and understanding this disclosure, and are intended to be within the scope of the principles disclosed herein. More particularly, many variations and modifications will be apparent to those skilled in the art from the description of the subject combination layout, and the components of, and / or the layout itself can be varied. In addition to variations and modifications to the components of, and / or the layout itself, other uses will be apparent to those skilled in the art.

Claims

1. An anti-corrosion structure for a chimney ring beam and expansion joint, characterized by: It includes a ring beam anti-corrosion structure that wraps the inner surface of the ring beam and an expansion joint anti-corrosion structure that fills the expansion joint. The ring beam anti-corrosion structure includes, from the inner layer to the outer layer, a ring beam interface agent layer, a first ring beam anti-corrosion adhesive layer, a first ring beam glass fiber cloth layer, a second ring beam anti-corrosion adhesive layer, a second ring beam glass fiber cloth layer, a third ring beam anti-corrosion adhesive layer, and a third ring beam glass fiber cloth layer; the expansion joint anti-corrosion structure includes, from the inner layer to the outer layer, an expansion joint interface agent layer, a first expansion joint anti-corrosion adhesive layer, a first expansion joint waterproof and acid-resistant roll material layer, a second expansion joint anti-corrosion adhesive layer, a second expansion joint waterproof and acid-resistant roll material layer, a third expansion joint anti-corrosion adhesive layer, and an expansion joint glass fiber cloth layer.

2. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 1, characterized in that: The anti-corrosion structure also includes a pressure edge system above the ring beam, and the pressure edge system includes a first pressure edge anti-corrosion adhesive layer and a lightweight vitrified brick layer from the inner layer to the outer layer.

3. The anti-corrosion structure of the chimney ring beam and expansion joint according to claim 2, characterized in that: The outer surfaces of the ring beam anti-corrosion structure, the expansion joint anti-corrosion structure and the edge pressing system are entirely coated with a sealing layer.

4. The anti-corrosion structure of the chimney ring beam and expansion joint according to claim 3, characterized in that: The ring beam interface agent layer and the expansion joint interface agent layer are high temperature resistant epoxy primers.

5. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 3, characterized in that: The first glass fiber cloth layer of the ring beam, the second glass fiber cloth layer of the ring beam, the third glass fiber cloth layer of the ring beam, and the glass fiber cloth layer of the expansion joint are acid-resistant glass fiber cloth.

6. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 3, characterized in that: The waterproof and acid-resistant coiled material of the first waterproof and acid-resistant coiled material layer and the second waterproof and acid-resistant coiled material layer is made of polytetrafluoroethylene material.

7. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 3, characterized in that: The first anti-corrosion rubber layer of the ring beam, the second anti-corrosion rubber layer of the ring beam, the third anti-corrosion rubber layer of the ring beam, the first anti-corrosion rubber layer of the expansion joint, the second anti-corrosion rubber layer of the expansion joint, the third anti-corrosion rubber layer of the expansion joint, the first anti-corrosion rubber layer of the pressure edge, and the sealing layer are all polyurethane modified asphalt adhesives.

8. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 3, characterized in that: The lightweight vitrified tile layer is a lightweight vitrified ceramic tile.

9. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 3, characterized in that: The first glass fiber cloth layer of the ring beam, the first glass fiber cloth layer of the ring beam, and adjacent layers of the first glass fiber cloth layer of the ring beam are pasted in a direction orthogonal to the cloth grain.

10. The anti-corrosion structure of chimney ring beam and expansion joint according to claim 9, characterized in that: The upper and lower surfaces of the lightweight vitrified brick layer are triangularly coated with polyurethane modified asphalt adhesive.

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