Flue liner fluoroplastic anticorrosive coating manufacturing process

Abstract

The invention relates to a flue liner fluoroplastic anticorrosive coating manufacturing process, which comprises a forming die and a variable aperture metal mesh. A soluble fluorine plastic thin filmwinds on a surface of the forming die; the variable aperture metal mesh winds or sleeves on a soluble fluorine plastic surface; when winding or sleeving on the soluble fluorine plastic surface, the variable aperture metal mesh is stretched, so that a mesh pore diameter of the variable aperture metal mesh is reduced; a soluble fluorine plastic thin film II re-winds on an outer surface of the stretched variable aperture metal mesh; a glass fiber cloth winds an outer surface of the soluble fluorine plastic thin film II so as to form a semi-finished product anticorrosive coating; on an outer surface of the glass fiber cloth, using a high temperature resistant material tape for bundling the semi-finished product anticorrosive coating in a covering way, melting in high temperature, and heat-plasticizing; and cooling at room temperature, and forming the anticorrosive coating finished product. According to the technical scheme, the pore diameter of the variable aperture metal mesh can be reduced, so that the anticorrosive coating is naturally shrunk during a natural cooling process, and the problem that the anticorrosive coating is fallen off due to expansion under heating and cooling conditions is solved.

Description

technical field [0001] The invention relates to an application process of anti-corrosion fluorine plastic lining in flue anti-corrosion, which is mainly used in the tail flue anti-corrosion of thermal power plants. Background technique [0002] Considering the complex composition of the flue gas in the flue, high humidity, high temperature and other effects on the flue body, it is necessary to carry out anti-corrosion treatment on the flue. At present, the flue anti-corrosion technology includes alloy lining, foam glass bricks, glass steel, glass flakes, etc. The above-mentioned technologies cannot perfectly solve the problems of corrosion, wear and fouling. Among them, glass flakes are the most widely used as anti-corrosion materials for flue ducts, but their processing process is complicated, and it cannot be kept stable depending on the technical level of construction workers, and it is easy to form cavities and bubbles on the surface of flue ducts, which will affect the ...

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Problems solved by technology

[0002] Considering the complex composition of the flue gas in the flue, high humidity, high temperature and other effects on the flue body, it is necessary to carry out anti-corrosion treatment on the flue. At present, the flue anti-corrosion technology includes alloy lining, foam glass bricks, glass steel, glass flakes, etc. The above technologies cannot perfectly solve the problems of corrosion, wear and fouling

Among them, glass flakes are the most widely used as anti-corrosion materials for flue ducts, but their processing process is complicated, and it cannot be kept stable depending on the technical level of construction workers, and it is easy to form cavities and bubbles on the surface of flue ducts, which will affect the anti-corrosion effect and life; higher temperature requirements

[0003] In order to solve the above defects, fluoroplastics were developed in the prior art to replace them. Fluoroplastics have the characteristics of strong corrosion resistance, strong adhesion resistance, high tensile strength, light weight, and wear resistance, and become excellent flue ducts. Anti-corrosion new materials, such as Chinese patent ZL200710066861.X, but due to the extremely large thermal expansion and contraction effect of fluoroplastics (ten times that of metals), the fluoroplastics prepared by this technology will produce extremely serious damage when the flue temperature is extremely high. The expansion effect makes it easy to fall off when it is used as a lining in the flue; in the prior art, in order to solve the problem of falling off under the thermal expansion of fluoroplastics, there has been a technical solution of using metal mesh for reinforcement, such as Chinese patent ZL92101053.2, but this The technology only plays a reinforcing role, and does not give full play to the role of the metal mesh, resulting in the inability to effectively control the shedding of fluoroplastics under thermal expansion and cold contraction through the metal mesh

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