人工防食皮膜処理による既設復水器の性能回復について

概要

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A seriously fouled condenser of the Sakai-Port Power Station which started in 1965 has been renovated by in-situ artificial protective film (APF) coating of the condenser tubes. The condenser of the No.2 unit with a capacity of 250 MW has two-water boxes called "A" and "B" condensers installed with aluminum -brass tube. The gradual decrease in heat transfer performance of the condenser tubes has been revealed by inspections of removed tubes. Based on measurements carried out in October 1983 for evaluating in-situ APF coating, in march 1984 in-situ APF coating was applied to only A condenser being more heavily fouled than B condenser. The comparative measurement conducted in October 1984 proved that the condenser vacuum was improved by about 0.6 kPa. The removed APF coated tubes presented sound coated surfaces, except for some tiny blisters at both ends, and no indication of corrosion after six months duration. In-situ APF coating is concluded as being a good countermeasure against corrosion and fouling.
1986-12-25