针对鄂尔多斯某气田含醇污水回收装置存在严重腐蚀这一难题, 首先对该装置关键设备的腐蚀原因进行了分析, 然后对自主开发的5种咪唑啉类BH型缓蚀剂进行筛选, 以筛选出的缓蚀剂为主剂, 与IS-DSS、ACA-4两种助剂进行复配, 在单因素的试验基础上, 采用响应面法进行优化, 得到最佳复配缓蚀剂。结果表明: 在H₂S、CO₂以及HCO₃^-、Cl^-等作用下, 设备表面形成的Fe₃S₄、Fe₂O₃、FeO、Fe(OH)₃等非保护性腐蚀产物是产生腐蚀的主要原因; BH-1型缓蚀剂效果最好, 以其为主剂通过复配IS-DSS、ACA-4两种助剂得到的复配缓蚀剂可达到协同缓蚀的目的, 当该复配缓蚀剂中BH-1、IS-DSS和ACA-4添加量分别为90.59 mg/L、30.44 mg/L和40.00 mg/L时, 缓蚀率高达97.71%。

In order to solve the problem of serious corrosion in the recovery unit of wastewater containing alcohol in a gas field in Ordos, the corrosion causes of the key equipment of the unit were analyzed. The main corrosion inhibitor was selected from five self-developed BH type corrosion inhibitors of imidazoline, and mixed with two additives of IS-DSS and ACA-4. Based on the single factor experiment, the response surface method was used to optimize the composite inhibitors. The results show that under the action of H₂S, CO₂, HCO₃^-, Cl^-, non-protective corrosion products such as Fe₃S₄, Fe₂O₃, FeO, Fe(OH)₃ formed on the surface of the equipment were the main cause of the corrosion. The inhibitor BH-1 had the best effect of corrosion inhibition. The composite corrosion inhibitor obtained by combining IS-DSS and ACA-4 with BH-1 as the main agent could achieve synergistic corrosion inhibition. The inhibition efficiency of the composite corrosion inhibitors could reach 97.71%, when the dosages of BH-1, IS-DSS and ACA-4 were 90.59 mg/L, 30.44 mg/L and 40.00 mg/L, respectively.