加氢装置设备铵盐重点腐蚀部位的分析

Analyzes of Ammonium Salt Heavy Corrosion Positions of Equipments in Hydrogenation Unit

炼油原料劣质化加剧铵盐如NH4Cl(氯化铵)、NH4HS(硫氢化铵)等结垢导致流程堵塞或极高腐蚀速率,另外部分Cl离子在加氢装置内不断循环累积加重局部腐蚀。本文对高压换热器、高压空冷器、汽提塔等重点易腐蚀部位进行了简单分析,并建议增加脱氯系统、规范注水系统、换热器新结构应用、升级材质、完善腐蚀保运体系等方法,以满足设备的长周期安全运行。

The worse crude oil make the process systems prone to fouling and corrosion by crystallization of ammonium salt such as ammonium chloride （NH4 Cl） and ammonium bisulfide （NH4 HS）. The chlorines circulated in unit made the corrosion worse. The heavy corrosion positions in high-pressure heat exchangers, air coolers, stripper and other equipments was simply analyzed, and some advices were given such as adding dechlorination system, standardizing water injection, trying new type heat exchangers, enhancing materials, revising corrosion protection to the satisfaction of long cycles operation of equipments.