A chimney inner tube expansion joint sealing anticorrosion structure

Abstract

The utility model relates to the field of expansion joint anticorrosion structure discloses a chimney inner tube expansion joint sealing anticorrosion structure, including flexible skin, glass steel angle and two groups of fixing parts, glass steel angle is located on lower inner tube upper end, and flexible skin is located between upper inner tube and glass steel angle, and the upper and lower ends of flexible skin are fixedly connected with upper inner tube inner wall and glass steel angle upper end inner wall through fixing part respectively, and the expansion joint is filled with buffer layer, and upper inner tube inner wall, lower inner tube inner wall and each glass steel angle inner wall all are paved with glass brick, flexible skin carries out flexible wrapping to expansion joint to form the physical isolation and cut off the penetration of acid liquid, and flexible skin sets up as arc to reserve the expansion allowance of flexible skin, and buffer layer can absorb thermal stress, through the mutual cooperation of flexible skin and buffer layer, form the dynamic sealing section that can be self -adaptation deformation, effectively absorb chimney axial and radial deformation, avoid the sealing failure that leads to under the environment of wet flue gas thermal expansion and cold shrinkage.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint anti-corrosion structure, specifically to a sealing and anti-corrosion structure for expansion joints inside a chimney. Background Technology

[0002] The chimney of a coal-fired power plant consists of an outer and an inner cylinder. The inner cylinder comprises an upper and a lower inner cylinder, with an expansion joint between them. After the widespread adoption of the limestone-gypsum wet desulfurization process in coal-fired power plants, the desulfurized flue gas exhibits significant characteristics of low temperature (45-50℃) and high humidity (near saturation). This condition easily leads to frequent condensation on the inner wall of the chimney, generating a highly acidic condensate (pH≈2.0) mainly composed of sulfuric acid and sulfurous acid, posing a continuous and severe corrosion threat to the chimney structure. Furthermore, without a flue gas reheat system, the chimney operates in a harsh environment of low temperature and high humidity for extended periods, resulting in a significantly higher corrosion rate than under conventional conditions. Simultaneously, residual corrosive components such as chlorides and fluorides in the flue gas exacerbate material degradation. Combined with the osmotic pressure in the positive pressure zone and the scouring effect caused by flue gas flow, the corrosion problem becomes increasingly complex, posing a serious challenge to the structural safety of the chimney and ultimately affecting the stable operation of the power plant system.

[0003] Existing technology discloses an anti-corrosion structure for the expansion joint of the inner sleeve ring beam of a chimney (publication number: CN204853520U). The anti-corrosion structure includes a reducing agent layer and a reinforcing agent layer, which are sequentially covered from the inside out on the inner surface of the expansion joint and the inner wall of the inner cylinder of the ring beam; a flexible sealant layer filling the expansion joint; a guide slope at a horizontal position on the inner wall of the inner cylinder of the ring beam; and a polymer heavy-duty anti-corrosion coating layer and a glaze layer, which are sequentially covered from the inside out on the reducing agent layer, the reinforcing agent layer, and the guide slope. Existing technology has good anti-corrosion effect and does not affect the original function of the expansion joint of the inner sleeve ring beam of the chimney. However, the strong corrosiveness of wet flue gas condensate can easily penetrate the anti-corrosion structure, leading to anti-corrosion failure, accelerated structural corrosion, and significant safety hazards. Therefore, we propose a sealing and anti-corrosion structure for the expansion joint of the inner cylinder of a chimney to solve the above problems. Utility Model Content

[0004] The present invention aims to provide a sealing and anti-corrosion structure for the expansion joint of the inner cylinder of a chimney, in order to solve the problem that the strong corrosiveness of wet flue gas condensate makes it easy to penetrate the anti-corrosion structure, leading to anti-corrosion failure, accelerated structural corrosion, and major safety hazards.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a sealing and anti-corrosion structure for the expansion joint of a chimney inner cylinder, comprising a flexible skin, fiberglass angle steel, and two sets of fasteners. The fiberglass angle steel is fixedly installed in a ring at the upper end of the lower inner cylinder, and the connection between the two ends of the fiberglass angle steel is made of fiberglass cloth and resin. The flexible skin is located between the upper inner cylinder and the fiberglass angle steel. The upper end of the flexible skin is fixedly connected to the inner wall of the upper inner cylinder through one set of fasteners, and the lower end of the flexible skin is fixedly connected to the inner wall of the upper end of the fiberglass angle steel through another set of fasteners. The flexible skin and the fiberglass angle steel can cover the expansion joint between the upper and lower inner cylinders. The expansion joint is filled with a buffer layer. The inner walls of the upper and lower inner cylinders and the inner walls of each fiberglass angle steel are all covered with glass bricks.

[0006] Preferably, as an improvement, the flexible skin is set to an arc shape, and the flexible skin is made of fluororubber, with a thickness of 3-5 mm.

[0007] Preferably, as an improvement, the fiberglass angle steel is bent into an L-shape, and the lower end of the fiberglass angle steel is fixedly connected to the upper end of the lower inner cylinder by expansion bolts.

[0008] Preferably, as an improvement, the gap between the lower end of the fiberglass angle steel and the upper end of the lower inner cylinder is filled with an elastic acid-resistant adhesive.

[0009] Preferably, as an improvement, the buffer layer is made of aluminum silicate cotton.

[0010] Preferably, as an improvement, the fastener is a fiberglass strip.

[0011] Preferably, as an improvement, an elastic acid-resistant adhesive is provided between the upper end of the skin and the inner wall of the upper inner cylinder, and between the lower end of the skin and the inner wall of the fiberglass angle steel.

[0012] The beneficial effects of this solution are as follows: Fiberglass angle steel, flexible skin, and glass bricks all possess acid-resistant, temperature-resistant, and aging-resistant properties, enabling them to resist long-term corrosion from acidic media and chlorides in wet flue gas, thus extending the service life of the structure. By setting up fiberglass angle steel to support the flexible skin, and in conjunction with the flexible skin to flexibly wrap the expansion joints, a physical barrier is formed to block acid penetration. The flexible skin is designed in an arc shape to allow for expansion and contraction. The buffer layer can absorb thermal stress. Through the cooperation of the flexible skin and the buffer layer, a dynamic sealing section that can adapt to deformation is formed, effectively absorbing the axial and radial deformation of the chimney and avoiding sealing failure caused by thermal expansion and contraction in a wet flue gas environment. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the sealing and corrosion-resistant structure according to an embodiment of the present invention. Detailed Implementation

[0014] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Flexible skin; 2. Upper inner cylinder; 3. Fiberglass angle steel; 4. Expansion bolt; 5. Buffer layer; 6. Glass brick; 7. Lower inner cylinder; 8. Support ring beam.

[0015] Example The basic implementation examples are as follows: Figure 1 As shown, the upper inner cylinder 2 is sleeved on the upper end of the lower inner cylinder 7 via a supporting ring beam 8, as... Figure 1 The diagram illustrates a sealing and corrosion-resistant structure for the expansion joint of a chimney inner cylinder, comprising a flexible skin 1, fiberglass angle steel 3, and two sets of fasteners. The fiberglass angle steel 3 is bent into an L-shape and is arranged in a ring at the upper end of the lower inner cylinder 7. The two ends of the fiberglass angle steel 3 are connected by fiberglass cloth and resin. The lower end of the fiberglass angle steel 3 is fixedly connected to the upper end of the lower inner cylinder 7 by expansion bolts 4. The gap between the lower end of the fiberglass angle steel 3 and the upper end of the lower inner cylinder 7 is filled with elastic acid-resistant adhesive. The flexible skin 1 is located between the upper inner cylinder 2 and the fiberglass angle steel 3. The flexible skin 1 is arc-shaped and made of fluororubber, with a thickness of 3-5mm. The fasteners are fiberglass pressure strips, which are bent... The bend is set to an L-shape. The upper end of the flexible skin 1 is fixedly connected to the inner wall of the upper inner cylinder 2 through one set of fasteners, and the lower end of the flexible skin 1 is fixedly connected to the upper inner wall of the fiberglass angle steel 3 through another set of fasteners. The flexible skin 1 and the fiberglass angle steel 3 can cover the expansion joint between the upper inner cylinder 2 and the lower inner cylinder 7. The expansion joint is filled with a buffer layer 5, which is made of aluminum silicate cotton. The inner walls of the upper inner cylinder 2, the lower inner cylinder 7, and each fiberglass angle steel 3 are all covered with glass bricks 6. In this embodiment, the glass bricks 6 are Bingode bricks, and Bingode adhesive is used to fix the glass bricks 6. The upper end of the skin and the inner wall of the upper inner cylinder 2, and the lower end of the skin and the inner wall of the fiberglass angle steel 3 are sealed with elastic acid-resistant adhesive.

[0016] The specific implementation process is as follows: (1) The staff removed the drip plate on the inner wall of the upper inner cylinder 2, and thoroughly ground and cleaned it. Then, they used quick-setting repair mortar to repair and smooth it. The upper surface of the lower inner cylinder 7 was repaired at the same time to ensure that the upper surface of the lower inner cylinder 7 was smooth. (2) The workers lay the prefabricated fiberglass angle steel 3 in a ring on the upper end of the lower inner cylinder 7 and fix it to the lower inner cylinder 7 with expansion bolts 4. The joints of the two ends of the fiberglass angle steel 3 are connected as a whole using glass fiber cloth and resin hand lay-up process to form a stable and corrosion-resistant whole. The gap between the fiberglass angle steel 3 and the upper inner cylinder 2 is sealed with elastic acid-resistant adhesive. (3) At a suitable position on the inner wall of the upper inner cylinder 2, the workers use self-tapping screws and fasteners to fix the upper edge of the flexible skin 1 to the inner wall of the upper inner cylinder 2, and seal the flexible skin 1 and the upper inner cylinder 2 with elastic acid-resistant adhesive. Then, the workers use self-tapping screws and another set of fasteners to fix the lower edge of the flexible skin 1 to the upper inner wall of the fiberglass angle steel 3, and seal the flexible skin 1 and the fiberglass angle steel 3 with elastic acid-resistant adhesive. When fixing the lower edge of the flexible skin 1, the workers make the flexible skin 1 arc-shaped, leave enough expansion allowance, and fill the expansion joint with aluminum silicate cotton.

[0017] (4) The staff used elastic acid-resistant adhesive to fix the glass bricks 6 to the inner walls of the fiberglass angle steel 3, the upper inner cylinder 2 and the lower inner cylinder 7, thereby completing the flexible wrapping of the expansion joint.

[0018] By setting up fiberglass angle steel 3 to support the flexible skin 1, and using the flexible skin 1 to flexibly wrap the expansion joint, a physical barrier is formed to block acid penetration. The flexible skin 1 is set in an arc shape to allow for expansion and contraction. The buffer layer 5 can absorb thermal stress. Through the cooperation of the flexible skin 1 and the buffer layer 5, a dynamic sealing section that can adapt to deformation is formed, which effectively absorbs the axial and radial deformation of the chimney and avoids sealing failure caused by thermal expansion and contraction in a wet flue gas environment.

[0019] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sealing and corrosion-resistant structure for expansion joints in the inner cylinder of a chimney, characterized in that: It includes a flexible skin, fiberglass angle steel, and two sets of fasteners. The fiberglass angle steel is fixedly installed in a ring at the upper end of the lower inner cylinder, and the two ends of the fiberglass angle steel are connected by fiberglass cloth and resin. The flexible skin is located between the upper inner cylinder and the fiberglass angle steel. The upper end of the flexible skin is fixedly connected to the inner wall of the upper inner cylinder by one set of fasteners, and the lower end of the flexible skin is fixedly connected to the inner wall of the upper end of the fiberglass angle steel by the other set of fasteners. The flexible skin and fiberglass angle steel can cover the expansion joint between the upper and lower inner cylinders. The expansion joint is filled with a buffer layer. The inner walls of the upper inner cylinder, the lower inner cylinder, and each fiberglass angle steel are all covered with glass bricks.

2. The chimney inner cylinder expansion joint sealing and corrosion protection structure according to claim 1, characterized in that: The flexible skin is curved and made of fluororubber, with a thickness of 3-5 mm.

3. The chimney inner cylinder expansion joint sealing and corrosion protection structure according to claim 2, characterized in that: The fiberglass angle steel is bent into an L-shape, and the lower end of the fiberglass angle steel is fixedly connected to the upper end of the lower inner cylinder by expansion bolts.

4. The chimney inner cylinder expansion joint sealing and corrosion protection structure according to claim 3, characterized in that: The gap between the lower end of the fiberglass angle steel and the upper end of the lower inner cylinder is filled with elastic acid-resistant adhesive.

5. The chimney inner cylinder expansion joint sealing and corrosion protection structure according to claim 4, characterized in that: The buffer layer is made of aluminum silicate cotton.

6. The chimney inner cylinder expansion joint sealing and corrosion protection structure according to claim 5, characterized in that: The fastener is a fiberglass strip.

7. The chimney inner cylinder expansion joint sealing and corrosion protection structure according to claim 6, characterized in that: Elastic acid-resistant adhesive is provided between the upper end of the skin and the inner wall of the upper inner cylinder, and between the lower end of the skin and the inner wall of the fiberglass angle steel.

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