关键词: 连续重整, 腐蚀, 再生系统, 高温脱氯罐, 脱戊烷塔, 复合型空冷系统, 氯离子,

Abstract:

Taking a 3.8 MM TPY continuous reforming unit of a large refining and chemical enterprise as an exploration case, this paper briefly describes the corrosion conditions that have occurred in the catalyst regeneration system, depentanizer reflux system, composite air cooling system, and other parts of the unit since its commissioning, and analyzes the relevant mechanisms. Corrosion of catalyst regeneration system includes chloride stress cracking corrosion of catalyst black burning air line, high temperature dechlorination tank corrosion, and particle wear corrosion of catalyst lifting pipeline. The corrosion of the reflux system of the depentanizer includes the disappearance of corrosion on the filter metal mesh because, 1/4 corrosion on the metal skeleton, and severe corrosion on the impeller. The corrosion of composite air cooling systems includes corrosion of pre cooled fins and evaporative tube bundles. By analyzing the corrosion situation of various equipment, measures such as strengthening the monitoring of feedstock components, improving process anti-corrosion, and upgrading pipeline materials are proposed to effectively reduce the full cycle corrosion rate of equipment and pipelines, ensuring the long-term stable operation of the continuous reforming unit.

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