分子筛脱水装置运行问题分析及处理

Analysis and treatment of operation problems of molecular sieve dehydration unit

关键词:  西北油田  天然气处理  分子筛  脱水  运行异常  化学反应

Key words:  northwest oil field  natural gas treatment  molecular sieve  dehydration  abnormal operation  chemical reaction

摘要:

中国石化西北油田分公司某采油厂轻烃站天然气脱水处理采用分子筛三塔流程,在运行过程中出现冷吹初始阶段出口温度升高、再生较快的异常情况。为此,该轻烃站在排除设备故障后,取再生气分水器排污样进行亚硫酸检测,结合气样XRF元素含量检测结果,分析得出导致分子筛失效、温度升高的本质原因为进站原料气中含氧量偏高,使得铁、氧及H₂S在干燥塔内发生一系列化学反应,放出热量。基于上述原因,采取相应的措施,打破化学反应所需环境条件,从而恢复正常生产,该装置的操作经验可为同类装置的设计及运行提供参考。

Abstract:

In the process of natural gas dehydration in a light hydrocarbon station of Northwest Oilfield Branch of Sinopec, molecular sieve three-tower process was adopted. During the initial stage of cold blowing, the exit temperature increased and the regeneration rate was faster. For this reason, after eliminated the equipment failure, sulfite was detected in the waste water sample from regenerated gas water separator, and combined with the results of XRF element content detection of gas sample, the essential reason of molecular sieve failure and temperature rise was that the oxygen content in the feed gas of the station was too high, which caused a series of chemical reactions among iron, oxygen and hydrogen sulfide in the drying tower and released heat. Based on above reasons, corresponding measures were taken to break the environmental conditions required for chemical reactions, consequently resuming the normal production. The operation experience of the unit could provide reference for the design and normal operation of similar units.