聚丙烯装置除盐水系统运行问题分析及对策  

Analysis and countermeasures of desalination water system operation problems in polypropylene plant

作　　者：刘军 王宇坤 魏振江 LIU Jun;WANG Yu-kun;WEI Zhen-jiang(No.3 Refinery Division of Ningxia Petrochemical Company,PetroChina,Yinchuan 750021,China)

机构地区：[1]中国石油宁夏石化公司炼油三部,宁夏银川750021

出　　处：《石化技术与应用》2024年第3期209-211,共3页Petrochemical Technology & Application

摘　　要：对中国石油宁夏石化公司10万t/a聚丙烯(PP)装置除盐水单耗高的原因进行了分析,并采取了相应的改进措施。结果表明:用于挤压造粒工段和干燥系统N_(2)洗涤塔(T-502)的除盐水用量较大,且T-502溢流口洗涤水未得到有效回收利用是装置除盐水单耗高的主要原因;通过增设回收-过滤水箱对T-502溢流口洗涤水进行回收,同时定期用新鲜除盐水对T-502内自循环洗涤水进行补水置换,使装置除盐水单耗由0.45 t/t降至0.23 t/t,且减缓了因洗涤水杂质增多及呈弱酸性带来的设备腐蚀问题。The causes of high unit consumption of desalination water in 1×10^(5) t/a polypropylene(PP)plant of Ningxia Petrochemical Company of PetroChina were analyzed,and the corresponding improvement measures were taken.The results showed that the main reason for the high unit consumption of desalination water was that the consumption of desalination water of the N_(2) scrubber(T-502)of the drying system and the extrusion granulation section was large,and the washing water of T-502 overflow port was not effectively recycled.The washing water of T-502 overflow port was recovered by adding a recovery-filtration water tank,and the self-circulating washing water in T-502 was replaced with fresh desalination water regularly,so that the unit consumption of plant desalination water was reduced from 0.45 t/t to 0.23 t/t,and the corrosion problem of equipment caused by the increase of impurities in washing water and weak acidity was alleviated.

关 键 词：聚丙烯 干燥系统 除盐水 溢流水 洗涤水 回收利用 节能降耗 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]