电站燃油锅炉腐蚀抑制剂的合成及作用机理  

Synthesis and action mechanism of corrosion inhibitors for power station oil-fired boilers

作　　者：生晓茹 贾超洋 张龙力[1] 王芳珠[1] 姜翠玉[1] SHENG Xiaoru;JIA Chaoyang;ZHANG Longli;WANG Fangzhu;JIANG Cuiyu(College of Chemical Engineering,China University of Petroleum,Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《精细化工》2023年第7期1596-1604,共9页Fine Chemicals

摘　　要：以硬脂酸、软脂酸、油酸、环烷酸4种有机酸和活性-60氧化镁(简称MgO)为主要原料,设计合成了复合无机-有机酸镁腐蚀抑制剂,考察了其使用性能,并对其作用机理进行了探究。结果表明,复合碳酸镁-环烷酸镁腐蚀抑制剂具有较好的效果,加量为1000μg/g时,烟气中SO_(3)含量降低了70.0%,钢片腐蚀速率降低了21.6%。合成的产品是一种纳米级MgCO_(3)粒子,其能在有机酸镁胶束包裹下形成稳定的胶体体系,有效解决了MgCO_(3)粒子在燃油中分散性差的问题,有利于发挥复合无机-有机镁盐的协同作用。随着燃油燃烧,腐蚀抑制剂产生的MgO与燃油产生的V_(2)O_(5)结合,降低了V2O5的浓度,减弱了其对SO_(2)向SO_(3)转化的催化作用,使烟气中SO_(3)含量降低,抑制了低温腐蚀。同时,MgO的存在使燃烧生成的钒酸盐种类由低熔点变为高熔点,高温腐蚀得到缓解。Composite inorganic-organic acid magnesium corrosion inhibitors were designed and synthesized from stearic acid,palmitic acid,oleic acid,naphthenic acid,and activated-60 magnesium oxide(MgO for short),followed by investigation on their inhibition performance and mechanism.The results showed that,with a dosage of 1000μg/g,the composite magnesium carbonate-magnesium naphthenate corrosion inhibitor reduced the SO_(3)content in flue gas by 70.0%,and the corrosion rate of the steel sheet by 21.6%,indicating good corrosion inhibition effect.The inhibitors synthesized was MgCO_(3)nanoparticles,which could form a stable colloidal system under the coating of organic magnesium acid micelles.The system efficiently solved the problem of poor dispersion of MgCO_(3)particles in fuel oil and was conducive to the synergistic effect between inorganic and organic magnesium salt.Along with the combustion of fuel oil,the MgO,which was produced by the corrosion inhibitor,combined with the V_(2)O_(5)produced by the fuel oil,leading to concentration reduction of V_(2)O_(5),catalytic performance weakening of V_(2)O_(5)on the conversion of SO2 to SO_(3),the SO_(3)content reduction in the flue gas,and eventually inhibited the low-temperature corrosion.At the same time,the existence of MgO made melting point of vanadate generated by combustion change from low to high,resulting in alleviation of high temperature corrosion.

关 键 词：腐蚀抑制剂 复合无机-有机酸镁 电站燃油锅炉 腐蚀 抑制腐蚀机理 油品添加剂 

分 类 号：TG174.42[金属学及工艺—金属表面处理] TK229.7[金属学及工艺—金属学]