Anticorrosive coating used on inner wall of desulfurization and denitrification device and preparation method thereof

Abstract

An anticorrosive coating used on the inner wall of a desulfurization and denitrification device comprises a main paint component A and a curing agent component B. The main paint component A comprises, by weight, epoxy resin, phenolic resin, nano-silicon dioxide, diatomite, ceramic micro-powder, glass powder, carbon black, a dispersing agent, a flatting agent, a defoaming agent, barium sulfate, an antirust agent, a 1# solvent, graphene nano-platelet powder and activated carbon. The curing agent component B comprises, by weight, a modified amine hardener and a 2# solvent. The weight ratio of the component A to the component B is 3.5-4.5:1. The anticorrosive coating is used for corrosion prevention of the inner wall of a dust remover of the desulfurization and denitrification device, is convenient to apply, corrosion of highly corrosive flue gas (such as SO<2>, NO<x>, HF and HCl) to the steel inner wall is effectively prevented, corrosion of highly corrosive liquid (such as H<2>SO<4>, HCl and HF) is effectively prevented, and meanwhile a paint film formed by the anticorrosive coating has very high abrasion resistance, temperature endurance and cold and hot shock resistance.

Description

technical field [0001] The present application relates to the technical field of coatings, in particular to an anti-corrosion coating used for the inner wall of a desulfurization and denitrification device and a preparation method thereof. Background technique [0002] The flue gas of desulfurization tower in thermal power plant contains SO 2 , NO x , HF, HCl and other gases, and after the wet limestone washing method is used for desulfurization, the washing liquid of the desulfurization system contains H 2 SO 4 , HCl, HF and other strong corrosive substance solutions, and in a low temperature, high humidity environment, further intensifies the corrosion of the desulfurization tower device. [0003] The inlet temperature of the flue gas absorption tower can be as high as 160°C to 180°C, and there is a certain dry and wet interface; the flue gas temperature at the outlet of the absorption tower is relatively low, about 45°C to 55°C, below the dew point. Therefore, the wet...

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Problems solved by technology

[0004] At present, flue gas desulfurization equipment in power plants (FlueGasDesulfurization referred to as "FGD") suffers from high-temperature corrosion and soot erosion and wear, and there is no corresponding anti-corrosion coating with good performance in China.

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