Anti-corrosion chimney and anti-corrosion method for chimney

A chimney and flue gas technology, used in combustion methods, combustion product treatment, exhaust gas devices, etc., can solve the problems of long downtime, slow construction, and insufficient ash joints in the factory, and achieve excellent anti-corrosion effect and construction. Convenient and simple, the effect that meets the requirements of use

Active Publication Date: 2015-11-25
张蕊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to various reasons such as cracks in the brick masonry itself, insufficient mortar joints, surface corrosion, and dust accumulation, it is also extremely difficult to deal with corrosion.
Therefore, even if the anti-corrosion material with very good effect is used on the existing brick lining, its anti-corrosion effect will be greatly reduced
Compared with ordinary structures, the anti-corrosion of chimneys also needs to solve the special working condition of flue gas temperature and temperature changes (when the desulfurization system fails and the flue gas is discharged directly, the temperature can reach above 150 degrees Celsius), which makes the selection of materials subject to many restrictions. Increased difficulty in corrosion protection
[0015] At the same time, due to the narrow internal space of the chimney, when renovating the old chimney, various materials need to be transported to the top of the chimney, which is as high as 100 meters. The entire construction period takes a long time, resulting in a long shutdown of the entire factory and large economic losses
Therefore, the reconstruction of the chimney of the power plant requires a very short construction period, and the use of complex technical solutions is limited. It is necessary to adopt a technical solution that is convenient for construction, which affects the construction quality and anti-corrosion effect.

Method used

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  • Anti-corrosion chimney and anti-corrosion method for chimney
  • Anti-corrosion chimney and anti-corrosion method for chimney

Examples

Experimental program
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Effect test

Embodiment 1

[0062] For existing chimneys such as figure 1 For the single-tube chimney of the structure shown, the anti-corrosion modification method is as follows:

[0063] (1) First, the inner surface of the single-tube chimney, that is, the surface of the ceramic tile layer, is pretreated. The pretreatment mainly includes removing dirt such as smoke and dust deposited on the surface, and exposing the body of the ceramic tile layer to facilitate subsequent treatment. Subsequently, the surface of the ceramic tile layer is processed, and the potholes produced by cracks, shedding, and corrosion of the ceramic tile are repaired to make the surface as smooth as possible. Said repair can choose concrete, viscous material of the same material as ceramic tiles or the material with physical properties similar to ceramic bricks, preferably the material with physical properties similar to ceramic bricks, so as to obtain the same thermal expansion and contraction properties as ceramic bricks.

[006...

Embodiment 2

[0075] The chimney shown in this embodiment is a newly built chimney, and its structure includes: a reinforced concrete cylinder body, an insulation layer, and a glass fiber reinforced plastic lining in sequence from outside to inside.

[0076] The new chimney is built according to the conventional process, and only the original anti-corrosion inner layer of the chimney in the prior art is replaced with a fiberglass lining. The material replacement does not change the construction process, so its construction is simple.

[0077] The newly-built chimney has no obvious corrosion marks and cracks after one year of operation in the coal-fired power plant. Compared with Comparative Example 1, the anti-corrosion effect of the chimney of the present invention is greatly improved after adding the glass fiber reinforced plastic lining, and its anti-corrosion effect is difficult to predict by those skilled in the art.

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Abstract

The invention discloses an anti-corrosion chimney lining structure and a chimney anti-corrosion method. The innermost layer of the chimney has a glass fiber reinforced plastic lining structure, and the structure forms an independent smoke exhaust function. The part outside the lining is only load-bearing structure. After adopting the fiberglass lining structure, the load-bearing structural layer of the chimney is completely isolated from the wet flue gas (acid liquid), the chimney will not be corroded, and it is convenient for construction and reduces the construction period.

Description

technical field [0001] The invention relates to an anti-corrosion chimney structure and a method for anti-corrosion of the chimney. More specifically, the invention relates to an anti-corrosion transformation method and structure of an old chimney. Background technique [0002] Existing flue gas discharge equipment mostly utilizes chimneys to discharge treated or untreated flue gas to high altitude. For example, in existing coal-fired power plants, after dust removal, desulfurization, denitrification and dehumidification processes, the flue gas is discharged into the sky with a chimney as high as more than 100 meters. The changes of flue gas medium concentration and temperature (under standard conditions) before and after wet desulfurization of coal-fired flue gas are shown in the following table: [0003] Table 1 [0004] [0005] Humidity is an important factor determining the corrosiveness of gaseous medium, and the critical temperature at which the corrosive medium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J13/02
Inventor 张蕊
Owner 张蕊
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