Discuss the causes of corrosion in the acid addition system for power plant circulating water and the methods for addressing it

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The main causes of corrosion problems in the system for adding acid to circulating water include issues related to material quality, installation methods, and the way in which chemicals are added. The material issue relates to the rubber layer inside the steel structure tank; while the steel structure itself is corrosion-resistant, the addition of rubber alters its chemical properties. The solution is to take into account these changes in chemical properties during the material design phase. Installation-related issues manifest as sulfuric acid leaks caused by inadequate watering tests; the solution is to use exposed pipes as much as possible to facilitate timely handling in the event of leaks. The problem with the method of adding chemicals manifests as an excess of acid or alkali in the neutralization reaction, which leads to corrosion of the condenser pipes; the solution to this issue is to use a metering system to control the addition of acid to the circulating water.