High temperature resistant and anti-corrosion coating structure for heat exchanger

Abstract

The invention discloses a high-temperature resistance anti-corrosion coating structure for a heat exchanger. The high-temperature resistance anti-corrosion coating structure is applied on the inner wall of a heat exchange plate and the surface of a heat exchange tube or the heat exchange plate and is characterized in that the high-temperature resistance anti-corrosion coating structure is a composite coating structure; the composite coating structure comprises polyurea filling layers which are applied on the inner wall of the heat exchange plate and the surface of the heat exchange tube or theheat exchange plate; the polyurea filling layers are coated with modified PPSU (Polyphenylsulphone) friction resistance layers; the modified PPSU friction resistance layers are coated with super-hydrophobic nano-silica coatings; the super-hydrophobic nano-silica coatings are of gradient composite layer structures; and the particle sizes of the silicon dioxide of different composite layers in thesuper-hydrophobic nano-silica coating increase gradually from the inside to the outside. The high-temperature resistance anti-corrosion coating structure for the heat exchanger has the characteristicsof strong combining capacity, good anti-corrosion performance, good high-temperature resistance, good dust prevention and high cleanliness.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a high-temperature-resistant and anti-corrosion coating structure for heat exchangers. Background technique [0002] The heat exchanger is an important equipment in petrochemical production. During production and operation, it will be corroded by chemical substances such as chlorides, sulfides, nitrides, and naphthenic acids in crude oil, and is easily damaged; in addition, the temperature difference between the working fluid and the medium is large , Under the action of thermal stress corrosion, water corrosion and erosion, the heat exchanger tube bundles are often damaged, the service life is shortened, and serious economic losses are caused. [0003] In order to avoid such problems, the heat exchange tubes in the prior art are generally made of stainless steel. Although they can resist corrosion, the material cost of stainless steel is too high, and the equipment inves...

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Problems solved by technology

[0005] However, it must be noted that this utility model patent mainly uses phenolic modified silicone resin. Although it can withstand high temperatures of 300°C, the material itself of phenolic resin has the following defects in application: such as high temperature and High pressure requirements; if the curing is slow, the complete curing time will be longer, and the cured product is hard and brittle, with poor weather resistance and discoloration over time

All of the above directly affect the protective effect of the silicaldehyde anti-corrosion coating on the heat exchange tube, and affect its service life

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