合成氨装置低温甲醇洗系统贫甲醇含水量升高的原因分析及对策  

Cause analysis and countermeasures for increasing water content of lean methanol in low-temperature methanol washing system of synthetic ammonia unit

作　　者：霍其雷[1] 尤永平[1] 李伟[1] HUO Qi-lei;YOU Yong-ping;LI Wei(Fertilizer Plant of Jilin Petrochemical Company,PetroChina,Jilin 132021,China)

机构地区：[1]中国石油吉林石化公司化肥厂,吉林吉林132021

出　　处：《石化技术与应用》2024年第3期216-220,共5页Petrochemical Technology & Application

摘　　要：针对中国石油吉林石化公司30万t/a合成氨装置在新增合成气净化系统的工艺改造后,低温甲醇洗系统贫甲醇含水量(质量分数,下同)异常升高(高达2.6%)并超过设计指标值(1.5%),不得不降负荷运行的情况,排查了相关影响因素,分析了导致甲醇/水分离塔塔板筛孔堵塞的原因,并实施了相应的工艺优化措施。结果表明:工艺优化措施实施后,大幅改善了甲醇/水分离塔的分离效果,不仅使该装置低温甲醇洗系统负荷率由82%提升至100%,还使贫甲醇含水量降低至0.4%。In response to the abnormal increase(up to 2.6%)in the water content of lean methanol(mass fraction,the same below)in the low-temperature methanol washing system of the 300 kt/a synthetic ammonia unit of Jilin Petrochemical Company of PetroChina after the process transformation of the newly added synthetic gas purification system,which exceeded the design index value(1.5%)and had to be operated at reduced-load,the relevant influencing factors were analyzed and investigated,and the reasons leading to the blockage of the sieve holes of the methanol/water separation tower tray were analyzed,then the corresponding process optimization measures were implemented.The results showed that after the implementation of process optimization measures,the separation effect of methanol/water separation from the tower was significantly improved.Not only did it increase the load rate of the low-temperature methanol washing system from 82%to 100%,but also reduced the water content of lean methanol to 0.4%.

关 键 词：合成氨装置 低温甲醇洗系统 甲醇/水分离 贫甲醇含水质量分数 异常升高 塔板堵塞 优化措施 

分 类 号：TQ113.264[化学工程—无机化工]