硫磺回收装置胺液再生系统腐蚀控制策略

Corrosion control strategy for amine solution regeneration system in sulfur recovery unit

关键词:  硫磺回收  胺液再生  热稳定盐  冲蚀  选材  腐蚀控制 

Key words:  sulfur recovery  amine solution regeneration  heat stable salt  erosion  material selection  corrosion control

摘要:

目的 解决硫磺回收装置胺液再生系统的腐蚀问题,保障装置的安稳长周期运行。方法 ①基于某企业胺液再生系统的工况条件及选材,结合发生的腐蚀问题,确定主要腐蚀/损伤类型、发生部位及严重程度；②根据介质类型划分区块,并提出关键参数的阈值和超标后的响应策略；③将腐蚀控制策略在工业现场进行应用,并验证其改善腐蚀问题的效果。结果 在采用推荐选材的情况下,通过设定温度和流速阈值、控制胺液特征指标,并在参数超标时采取相应的响应策略,能够将胺液再生系统的整体腐蚀速率控制在0.05 mm/a以下。结论 通过在重点腐蚀部位实施腐蚀控制策略,胺液再生系统设备和管道的腐蚀程度得到显著缓解,有助于延长单次运行周期,实现降本增效。 

Abstract:

Objective The corrosion problem of amine solution regeneration system is solved to ensure the safe, stable and long-term operation of the sulfur recovery unit. Methods (1) Based on the operating conditions and material selection of amine solution regeneration system in a refinery, combined with the corrosion problems that have occurred, the main corrosion/damage types, corrosion sites and corresponding severity were determined. (2) Blocks were divided according to the medium type, and the threshold values of key parameters and the off-limits response strategies were proposed. (3) The corrosion control strategy was applied in the industrial field, and its effect on improving the corrosion problem was verified. Results Under the condition of using the recommended materials, the overall corrosion rate of the amine solution regeneration system could be confined to less than 0.05 mm/a by setting the temperature and flow rate thresholds, controlling the specific indexes of amine, and adopting the corresponding response strategy when the parameters exceeded the standard. Conclusion sBy implementing corrosion control strategy in the key corrosion regions, the corrosion degree of equipment and pipelines in the amine solution regeneration system has been significantly alleviated, which is helpful for prolonging single operation cycle and achieving cost reduction with efficiency increased.