Abstract
Abstract Failures of air cooler tubes caused by under deposit corrosion of NH 4 Cl salts are investigated in this paper. The corrosion mechanism is determined by the analysis on the micro-morphology and chemical composition of corrosion products. Thermodynamics calculation indicates that the corrosion region inside the air cooler tubes is closely correlated to the crystallization temperature of NH 4 Cl salts and the dew point temperature of water. The numerical simulation demonstrates that the NH 4 Cl salts tend to deposit on the upper surface of tubes. The maximum concentration of NH 4 Cl salts locates at 0.65 m–0.73 m away from the tube entrance when the multiphase flow velocity ranges from 3.5 m/s to 5.0 m/s. In the experiments of under deposition corrosion, the similar micro-morphology as the actual localized corrosion is found in the specimens of carbon steel. The anti-corrosion performance of 316 L stainless steel is much better than carbon steel at different temperatures and humidity, which explains why the corrosion of tube liners is not serious as the tube bundles.
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