惠州炼化芳烃抽提装置腐蚀来源及防腐策略

惠州炼化分公司芳烃抽提装置腐蚀严重,多个换热器发生了不同程度的泄漏,分析腐蚀原因包括因溶剂环丁砜的降解而导致的系统p H值的降低、氯离子含量超标等,对应上述问题,提出抑制腐蚀的办法,即在严格控制加热温度、系统氧含量、溶剂水含量、p H值的前提下,将换热器材质升级为316L不锈钢,并采用阴离子交换树脂降低溶剂中氯离子、硫酸根离子含量,以维持抽提系统平稳持久运行。

Huizhou Petrochemical Aromatics Extraction Unit Corrosion Sources and Anticorrosion Strategies

The aromatic extraction unit of Huizhou Refining Chemical Company suffered from serious corrosion,a plurality of heat exchangers leaked in different degrees,the reasons of corrosion included the reduce of p H caused by the degradation of solvent sulfolane,chloride ion exceeded the standard,corresponding to the problem,the corrosion inhibition method was put forward,strictly controlling the heating temperature,oxygen content,water content in solvent,p H value,at the same time upgrading the material of the heat exchangers for 316 L stainless steel,and reducing the content of chloride ions and sulfate ions in solvent with anion-exchange resin,in order to operate the extraction system stable and durable.