摘要
针对某炼油厂连续重整装置脱戊烷塔的空气冷却器腐蚀,首先根据脱戊烷塔顶回流罐气体的分析数据,排除了NH4HS腐蚀的可能性;其次通过对工艺操作过程分析以及借鉴其他石化企业的腐蚀防护经验,确认氯化铵在空气冷却器内部沉积是脱戊烷塔顶空气冷却器A205腐蚀的原因;最后根据工艺条件和现场原料油、补充氢的分析数据进行了氯含量核算,并依据核算结果制定了防护措施:(1)脱戊烷塔顶挥发线注水,注水量约为塔顶流量的1%;(2)监测脱戊烷塔顶回流罐排出水的pH值,如果pH值低于6,在脱戊烷塔顶挥发线增注缓蚀剂。
In the analysis of the corrosion of depentanizer overhead air cooler in the continuous catalytic reformer of a refinery,the possibility of NH4HS corrosion was ruled out based upon the analysis data of gas in depentanizer overhead reflux drum.The analysis of process operation and experience in corrosion protection of other petrochemical plants have confirmed that the ammonia chloride deposition in air cooler is the culprit of corrosion of overhead air cooler A205.The content of chloride was calculated based upon the process conditions and analysis data of feed oil and make-up hydrogen,on the basis of which,effective corrosion protection measures were developed,i.e.（1） injection of water in the depentanizer overhead vaporization line at a flowrate which is 1% of depentanizer overhead flow;（2） pH value of blowdown water of depentanizer overhead reflux drum is monitored.If pH value is lower than 6,corrosion inhibitor shall be injected into the overhead vaporization line of depentanizer.
出处
《炼油技术与工程》
CAS
2012年第1期48-51,共4页
Petroleum Refinery Engineering
关键词
连续重整
脱戊烷塔
空气冷却器
腐蚀原因
防护措施
continuous catalytic reforming
depentanizer
air cooler
corrosion causes
protection measures
