在硝基苯废水资源化利用过程中煤气化棒磨机设备的腐蚀  

Corrosion of Coal Gasification Unit Rod Mill Equipment in Recycling Process of Nitrobenzene Waste Water

作　　者：曹振兴 CAO Zhenxing(Sinopec Engineering Group Luoyang R&D Center of Technology,Luoyang 471003,China;Sinopec Anti-corrosion Research Center of Petrochemical Equipment,Luoyang 471003,China)

机构地区：[1]中石化炼化工程集团洛阳技术研发中心,洛阳471003 [2]中国石化石油化工设备防腐蚀研究中心,洛阳471003

出　　处：《腐蚀与防护》2024年第5期92-98,114,共8页Corrosion & Protection

摘　　要：通过模拟现场工况的浸泡试验和电化学试验,研究了硝基苯废水再利用过程中煤气化装置棒磨机腐蚀的类型、影响范围、主要介质及腐蚀发生的边界条件。结果表明:将制浆水源更换为硝酸苯废水后,由于硝酸苯废水中含有亚硝酸根离子,棒磨机发生了严重的缝隙腐蚀而频繁失效;当硝基苯废水中亚硝酸质量分数小于30μg/g时,棒磨机65Mn钢衬板的缝隙腐蚀可得到有效控制;在棒磨机内部混合过程中亚硝酸根因发生化学反应而消失,棒磨机后续设备管道的缝隙腐蚀风险降低。The corrosion type,influence range,main medium and boundary conditions of the rod mill of coal gasifcation unit during the reuse process of nitrobenzene waste water were studied by immersion test and electrochemical test in simulated field conditions.The results show that after the coal slurry water source was replaced with benzene nitrate waste water,the rod mill suffered severe crevice corrosion and frequently failed due to the existence of nitrite ion in the nitrobenzene waste water.When the mass fraction of nitrite ion in the nitrobenzene waste water was less than 30μg/g,the crevice corrosion of 65Mn steel lining plate could be under control.As nitrite ions consumed by chemical reaction during the mixing process in the rod mill,the risk of crevice corrosion in pipelines of equipment behind the rod mill reduced.

关 键 词：硝基苯废水 棒磨机 腐蚀 煤气化 水煤浆 

分 类 号：TG172[金属学及工艺—金属表面处理]