Corrosion-resistant renovation method for lining titanium plate for steel cylinder of chimney

Abstract

The invention provides a corrosion-resistant renovation method for a lining titanium plate for a steel cylinder of a chimney. The corrosion-resistant renovation method comprises following operation steps: surface processing, keel production, installation of unit keels and welding of the titanium plate. The corrosion-resistant renovation method for the lining titanium plate for the steel cylinder of the chimney has following beneficial effects: fine corrosion-resistant performance is obtained; high heat resistance is achieved; great wear-resisting and anti-scouring performance is possessed; the period is shortened; service lifetime is prolonged; maintenance risks are reduced; cost is decreased; and power is increased.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion, in particular to a method for anti-corrosion transformation of a chimney steel cylinder lined with a titanium plate. Background technique [0002] At present, there are many disadvantages in the anticorrosion of steel chimneys used in thermal power plants, such as short service life, high maintenance costs, complicated operation procedures, length of construction period, wear resistance and pressure resistance, and temperature control. [0003] There are several anti-corrosion methods for steel chimneys commonly used in the market: glass flake coating, glass brick (Bingold system), and titanium-steel composite plate lining. Glass bricks have a long construction period, are easy to fall off, have general anti-corrosion performance, short service life, and require frequent maintenance. The anti-corrosion performance of the glass flake coating is average, and the adaptable temperature is rel...

AI Technical Summary

Problems solved by technology

Titanium steel composite plate lining has good anti-corrosion effect and requires no maintenance, but the process is complicated, the construction period is long, and the production cost is high

[0004] In order to avoid the defects of the existing process—titanium-steel composite plate lining, some manufacturers have adopted the operation method of directly fixing the titanium plate on the keel of the inner cylinder of the steel chimney, and retrieved it from the patent database of the Patent Office of the State Intellectual Property Office. Known: such as China's invention patent, the patent number is: CN201020153952.4, which discloses a steel chimney inner tube anti-corrosion device, which uses titanium bolts to fasten the steel keel and titanium plate, and then tighten the bolts. The inner and outer joints of the hole are welded and sealed. Although this method of mechanical connection solves the problem of connecting titanium and steel, it increases the installation and sealing welding process of titanium bolts. At the same time, it is not conducive to personnel operation due to its narrow working surface. , will also bring new safety and quality hidden dangers; therefore, in this technical scheme, the titanium plate and the titanium bolt are sealed and welded, and the steel keel is sealed and welded with the steel nut, that is, it is combined by the titanium bolt and the steel nut The connecting bolts of dissimilar materials connect the titanium plate and the steel keel together. However, in practical applications, the steel chimney will generate greater vibration and thermal expansion and contraction, thereby increasing the stress of the bolt sealing welding part, resulting in titanium bolts and steel chimneys. There are cracks in the seal welding part of the titanium plate, and the steel chimney is corroded due to the smoke entering the cracks, resulting in increased costs and greater safety hazards, etc.

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