基于pH值计算的加氢空冷器系统腐蚀风险分析  

Corrosion risk analysis of hydrogenation air cooler system by pH value calculation

作　　者：偶国富[1,2] 孙利[1] 朱敏[1] 王凯[1] 王宽心[1] 

机构地区：[1]浙江理工大学,浙江省杭州市310018 [2]杭州富如德科技有限公司,浙江省杭州市310018

出　　处：《炼油技术与工程》2015年第7期42-46,共5页Petroleum Refinery Engineering

基　　金：国家基金委与神华集团联合资助项目(U1261124);浙江理工大学科研启动基金(15022014-Y)

摘　　要：对加氢反应流出物空冷器系统进行了腐蚀失效机理分析,构建了反应流出物多相流体系中溶液介质pH值的计算模型。当原料油进料量为105t/h、空冷器操作压力为13MPa时,分别考察原料油中硫、氮、氯含量及注水量等不同因素对空冷器系统溶液介质pH值的影响。结果表明：①与低温区域（温度低于140℃）相比,高温区域（温度高于145℃）溶液介质pH值低于5.5,空冷器的腐蚀失效风险较高;②综合原料油中不同硫、氯及氮含量对溶液介质pH值的影响,反应流出物空冷器入口温度在152℃时,溶液介质pH值在4.4～5.4存在较高的腐蚀失效风险;③空冷器注水量大于13t/h时,可有效降低空冷器系统的腐蚀失效风险。建议在加工高硫、高氯等劣质原料油时,适量注入氨水或有机胺,以降低由pH值引起的空冷器腐蚀失效风险。The corrosion failure mechanisms of air cooler system are analyzed based upon process of hydrogenation reaction effluent. The p H value variations of solution medium in air cooler system are obtained for different feedstocks with different sulfur,nitrogen and chlorine contents at the conditions of 105 t / h feedstock flowrate and 13 MPa operating pressure of air cooler by the establishment of p H value computational model of multinphase flow system for reactor effluents. The results show that：（ 1） the p H value of solution medium in high-temperature region（ higher than 145 ℃） is 5. 5 lower than that of low-temperature region（ lower than140 ℃）; The corrosion failure risk of the air cooler is high;（ 2） the different sulfur,nitrogen and chlorine contents have impacts on p H value of solution medium. At the 152 ℃ inlet temperature of air cooler reactor＇s effluent,the p H value of solution medium is 4. 4 ～ 5. 4,which imposes a higher corrosion failure risk;（ 3）The 13 t / h water injection rate can effectively reduce the risk of corrosion failure of air cooler. It is suggested that,when the feedstock with high sulfur,nitrogen and chlorine is processed,proper amount of ammonia liquor or organic ammonia can be injected to minimize the corrosion failure risk of air cooler caused by p H value.

关 键 词：加氢反应流出物 加氢空冷器 腐蚀 PH值计算 风险分析 

分 类 号：TE986[石油与天然气工程—石油机械设备]