Chimney anti-corrosion structure

Abstract

The chimney anti-corrosion structure comprises an outer cylinder and a steel inner cylinder, an anti-corrosion layer is arranged on the inner circumferential face of the steel inner cylinder, the anti-corrosion layer sequentially comprises a framework, a primer layer, foam glass bricks and a protective layer from inside to outside, the framework is installed on the inner circumferential face of the steel inner cylinder, and a plurality of brick lattices are formed between the framework and the steel inner cylinder. The primer layer and the foam glass bricks are sequentially arranged in the brick lattices, and the protective layer is arranged on the outer sides of the framework and the foam glass bricks. According to the anti-corrosion structure, the framework serves as an installation foundation of the foam glass bricks and plays a role in supporting and fixing the foam glass bricks, and the foam glass bricks have the advantages of being resistant to chemical corrosion, resistant to high temperature, excellent in heat insulation performance, resistant to temperature change, light in weight, low in volatilization, safe to construct, long in service life, resistant to fire disasters and beneficial to relieving chimney rain. Construction is simple, and corrosion resistance is high.

Description

Technical Field

[0001] The utility model relates to the technical field of chimney anti-corrosion, in particular to a chimney anti-corrosion structure. Background Art

[0002] The chimney of a general power plant is a sleeve-type steel-concrete structure, with the outer tube made of reinforced concrete and the inner tube made of steel exhaust pipe. The outer tube wall of the chimney is designed as a variable slope cylinder. The steel inner tube adopts NNS1-2 sulfuric acid dew point corrosion resistant steel plate. The paint anti-corrosion of the outer side of the steel inner tube adopts epoxy zinc-rich paint and epoxy micaceous iron intermediate paint. The anti-corrosion material of the inner side of the steel inner tube adopts HF83 type RHF special anti-corrosion coating, and the insulation material of the steel inner tube adopts rock wool. After wet desulfurization, the content of SO2 in the flue gas is greatly reduced, but this washing method is not effective in removing a small amount of SO3 in the flue gas, and nearly 1% of SO2 and most of SO3 still remain, in addition to some other corrosive elements. There are local corrosion perforations, acid flow, and partial damage to the insulation cotton wire mesh on the outer surface of the steel inner tube.

[0003] In the prior art, two Chinese utility model patents, CN201620033644.5, entitled "An anti-corrosion structure for steel chimney inner tube", and CN201820258427.5, entitled "A composite heavy anti-corrosion structure for titanium plate chimney in thermal power plants", both provide technical solutions for laying metal titanium plates on the inner surface of the steel inner tube for anti-corrosion. However, this anti-corrosion construction has a long construction period and high investment, and many power plants that currently use this anti-corrosion technology have reported that corrosion perforation has occurred, and corrosion is prone to occur at welds, and when the flue gas temperature is high, there is a tendency to accelerate corrosion. Utility Model Content

[0004] The purpose of the utility model is to provide a chimney anti-corrosion structure to solve the problems of long construction period and high investment in existing chimney anti-corrosion construction, and that many power plants currently using this anti-corrosion technology have reported that corrosion perforation has occurred, and that corrosion is easily generated at welds, and that there is a tendency to accelerate corrosion when the flue gas temperature is high.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A chimney anti-corrosion structure comprises an outer tube and a steel inner tube, an anti-corrosion layer is arranged on the inner circumference of the steel inner tube, and the anti-corrosion layer comprises a skeleton, a primer layer, foam glass bricks and a protective layer in sequence from the inside to the outside, the skeleton is installed on the inner circumference of the steel inner tube, and a plurality of brick grids are formed between the skeleton and the steel inner tube, the primer layer and the foam glass bricks are arranged in the brick grids in sequence, and the protective layer is arranged on the outside of the skeleton and the foam glass bricks.

[0007] A further technical solution is: the foam glass brick is a borosilicate foam glass brick.

[0008] A further technical solution is that the frame is formed by alternately welding a plurality of horizontal plates and a plurality of vertical plates.

[0009] A further technical solution is that: the transverse plate is in a circular ring shape.

[0010] A further technical solution is that the horizontal plate is arranged to be inclined upward.

[0011] A further technical solution is that the horizontal plate and the vertical plate are titanium-steel composite plates.

[0012] A further technical solution is: the protective layer is a fluororubber anti-corrosion layer.

[0013] A further technical solution is that an adhesive is provided between the primer layer and the foam glass brick.

[0014] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0015] The utility model proposes a chimney anti-corrosion structure, which uses a skeleton as the installation basis of foam glass bricks, and plays the role of supporting and fixing the foam glass bricks. The foam glass bricks have the advantages of chemical corrosion resistance, high temperature resistance, excellent thermal insulation performance, temperature change resistance, light weight, low volatility, safe construction, long service life, fire resistance, and is conducive to alleviating chimney rain. The anti-corrosion structure has low cost, simple construction and strong corrosion resistance.

[0016] The protective layer is a fluororubber structural layer lining system with good corrosion resistance, temperature resistance, wear resistance, heat aging resistance, cold and hot shock resistance, crack resistance, etc. The protective layer can seal the chimney matrix and foam glass bricks and fill the brick joints. It can also fully protect the chimney matrix, foam glass bricks and brick joints under high and low temperature and concentrated SO2 and SO3 gas environments. It is airtight to water, water vapor, acid and acid vapor, and does not absorb liquids. The fluororubber structural layer lining system can resist inorganic acids and salt solutions. The fluororubber structural layer lining system is light in weight and simple in construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a structural schematic diagram of a chimney anti-corrosion structure.

[0018] Figure 2 For this utility model Figure 1 Schematic diagram of the structure of the middle anti-corrosion layer.

[0019] Figure 3 For this utility model Figure 1 Schematic diagram of the structure of the mesoskeleton.

[0020] Figure 4 For this utility model Figure 1 Schematic diagram of the structure from a top-down perspective.

[0021] Figure 5 For this utility model Figure 4 Schematic diagram of the structure of the middle cross plate.

[0022] Figure numerals: 1. outer tube; 2. steel inner tube; 3. anti-corrosion layer; 4. frame; 5. primer layer; 6. foam glass brick; 7. protective layer; 8. brick grid; 41. horizontal plate; 42. vertical plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiment 1:

[0030] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a chimney anti-corrosion structure comprises an outer tube 1 and a steel inner tube 2, an anti-corrosion layer 3 is arranged on the inner circumference of the steel inner tube 2, and the anti-corrosion layer 3 comprises a skeleton 4, a primer layer 5, foam glass bricks 6 and a protective layer 7 in sequence from the inside to the outside, the skeleton 4 is installed on the inner circumference of the steel inner tube 2, and a plurality of brick grids 8 are formed between the skeleton 4 and the steel inner tube 2, the primer layer 5 and the foam glass bricks 6 are arranged in the brick grids 8 in sequence, and the protective layer 7 is arranged on the outside of the skeleton 4 and the foam glass bricks 6.

[0031] The skeleton 4 is fixed to the inner circumference of the steel inner tube 2 by rivets, bolts or welding, and the primer is sprayed on the inner circumference of the steel inner tube 2 and the skeleton 4 to form a primer layer 5 to play an anti-corrosion role. Then the foam glass bricks 6 are installed in the brick grid 8 of the skeleton 4, and finally the protective layer 7 is laid on the outside of the skeleton 4 and the foam glass bricks 6. The anti-corrosion structure has low cost, simple construction and strong corrosion resistance.

[0032] Preferably, the foam glass brick 6 is a borosilicate foam glass brick.

[0033] Foam glass bricks are resistant to chemical corrosion, high temperature resistance, excellent thermal insulation performance, temperature change resistance, light weight, low volatility, easy and safe construction, long service life, fire resistance, and help alleviate chimney rain.

[0034] Embodiment 2:

[0035] Based on the above embodiments, this embodiment Figure 4 and Figure 5 As shown, the frame 4 is formed by alternately welding a plurality of horizontal plates 41 and a plurality of vertical plates 42. The horizontal plates 41 are in the shape of a ring. The horizontal plates 41 and the vertical plates 42 are titanium steel composite plates.

[0036] The frame 4 is the installation base of the foam glass bricks, and plays the role of supporting and fixing the foam glass bricks 6. The titanium steel composite plate has strong corrosion resistance.

[0037] Preferably, the transverse plate 41 is arranged to be inclined upward.

[0038] The horizontal plate 41 is tilted upward to support the foam glass bricks 6 to prevent the foam glass bricks 6 from falling.

[0039] Preferably, the protective layer 7 is a fluororubber anti-corrosion layer.

[0040] Fluororubber anticorrosion layer (fluororubber structural layer lining system) has good corrosion resistance, temperature resistance, wear resistance, heat aging resistance, cold and hot shock resistance, crack resistance and other properties. The protective layer can seal the chimney matrix and foam glass bricks and fill the brick joints. It can also fully protect the chimney matrix, foam glass bricks and brick joints under high and low temperature and concentrated SO2 and SO3 gas environments. It is airtight to water, water vapor, acid and acid vapor, and does not absorb liquids. Fluororubber anticorrosion layer can resist inorganic acids and salt solutions. Fluororubber structural layer lining system is light in weight and simple in construction method.

[0041] Preferably, an adhesive is provided between the primer layer 5 and the foam glass brick 6 .

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A chimney anti-corrosion structure, comprising an outer cylinder (1) and a steel inner cylinder (2), characterized in that: An anti-corrosion layer (3) is arranged on the inner circumference of the steel inner tube (2), and the anti-corrosion layer (3) includes a frame (4), a primer layer (5), foam glass bricks (6) and a protective layer (7) in sequence from the inside to the outside. The frame (4) is installed on the inner circumference of the steel inner tube (2), and a plurality of brick grids (8) are formed between the frame (4) and the steel inner tube (2). The primer layer (5) and the foam glass bricks (6) are arranged in sequence in the brick grids (8), and the protective layer (7) is arranged on the outside of the frame (4) and the foam glass bricks (6).

2. The chimney anticorrosion structure according to claim 1, characterized in that: The foam glass brick (6) is a borosilicate foam glass brick.

3. The chimney anti-corrosion structure according to claim 1, characterized in that: The frame (4) is formed by alternately welding a plurality of transverse plates (41) and a plurality of vertical plates (42).

4. The chimney anticorrosion structure according to claim 3, characterized in that: The transverse plate (41) is in the shape of a circular ring.

5. The chimney anticorrosion structure according to claim 4, characterized in that: The horizontal plate (41) is arranged to be inclined upward.

6. The chimney anticorrosion structure according to claim 4, characterized in that: The horizontal plate (41) and the vertical plate (42) are titanium-steel composite plates.

7. The chimney anticorrosion structure according to claim 1, characterized in that: The protective layer (7) is a fluororubber anti-corrosion layer.

8. The chimney anti-corrosion structure according to claim 1, characterized in that: An adhesive is provided between the primer layer (5) and the foam glass brick (6).

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