The inner wall of the flue gas desulfurization tower is coated with a metal nano-polymer alloy coating for corrosion protection

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The inner wall of the flue gas desulfurization tower is coated with a metal-nanopolymer alloy coating for corrosion protection. The main source of corrosion in the flue gas desulfurization system is SO2 contained in the flue gas. When sulfur-containing flue gas is under desulfurization conditions, under the action of forced oxidation, SO2 in the flue gas first reacts with water to form H2SO3 and H2SO4, which then react with alkaline absorbents to produce sulfate precipitates that can be separated. At this stage, the process environment temperature is exactly at the temperature range for activation corrosion by dilute sulfuric acid; thus, the corrosion rate is high and the penetration capacity is strong. Consequently, the intermediate products H2SO3 and H2SO4 are the main causes of equipment corrosion. The commonly used method for desulfurization towers at present is a resin-glass flake lining. A common problem with coatings that have been treated for corrosion resistance is their high brittleness, excessive thickness, and short service life. It is easy for the anti-corrosion coating to delaminate from the metal surface, resulting in a loss of its anti-corrosive function. Furthermore, there are safety hazards during the construction process. The use of metal-nanopolymer alloy materials can solve the problem of corrosion on the metal surfaces of desulfurization towers, thereby yielding significant economic benefits.