Anticorrosion modification method and special coating preparation for desulfurization chimney in thermal power plant

Abstract

The invention relates to an anticorrosion modification method for a desulphurization chimney of a thermal power plant. The main structures to be modified are an anticorrosion structure of a dilatation joint, an anticorrosion structure of an ash collecting platform, an anticorrosion structure of a bracket node and an anticorrosion structure of a steel inner cylinder. The casting glue applied to the method is formed by mixing liquid hydroxyl-terminated polybutadiene, naphthenic oil, barium sulfate, asphalt and the like. Another kind of casting glue applied to the method is formed by mixing hydroxyl-terminated polydimethylsiloxane, barium sulfate, white carbon black and the like. An anticorrosion silicone rubber applied to the method is formed by mixing hydroxyl-terminated polydimethylsiloxane, polydimethyl siloxane fluid, barium sulfate, white carbon black and the like. An anticorrosion organosilicon paint applied to the method is mixed by hydroxyl-terminated polydimethylsiloxane, polydimethyl siloxane fluid, white carbon black, iron oxide red and the like.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion engineering, in particular to a method for anti-corrosion reconstruction of desulfurization chimneys of thermal power plants and special glue. Background technique [0002] In the prior art, the flue gas entering the chimney after wet desulfurization has the following characteristics: (1) the moisture content in the flue gas is high, and the humidity of the flue gas is very high; (2) the temperature of the flue gas is low, generally around 80°C, such as There is no flue gas heat exchanger, and the flue gas temperature is only 45°C; (3) Strong corrosive substances such as chloride, fluoride and sulfurous acid in the flue gas are highly corrosive to the chimney; (4) The flue gas contains The concentration of sulfuric acid is low, and the resulting low-concentration acid solution is more corrosive to the chimney inner barrel than the high-concentration acid solution. When the low-concentratio...

AI Technical Summary

Problems solved by technology

[0004] 1. The position of the expansion joint, because the size of the gap will change, it is more difficult to carry out anti-corrosion treatment

[0005] 2. The location of the ash receiving platform, because the ash receiving platform cannot be very smooth, the acid will converge to a certain part, and the corrosion is particularly serious. Moreover, due to the lack of smoothness, it is more difficult to carry out anti-corrosion treatment

[0006] 3. The position of the joint of the corbel, under the alternating state of cold and heat, the flexibility of this part is relatively large, the stress is concentrated, and the stress cracking of the anti-corrosion layer is most likely to be caused; serious

[0007] 4. The steel inner cylinder used in some chimneys, although the stainless steel inner cylinder combined with the anti-corrosion coating on the surface will have a certain anti-corrosion effect, but after a long time, corrosion will still occur, and the corrosion surface is not easy to repair

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