某海洋气田中心平台三甘醇脱水系统模拟研究

Simulation research on TEG dehydration system of an offshore gas field central processing platform

关键词:  Aspen HYSYS  三甘醇  脱水  贫甘醇  循环量  质量分数  再沸器温度  汽提气流量

Key words:  Aspen HYSYS  triglycol  dehydration  lean TEG  circulation rate  mass fraction  reboiler temperature  stripping gas flow rate

摘要:

使用Aspen HYSYS软件,对某海洋气田中心平台正在运行的三甘醇(TEG)脱水装置进行模拟计算。在天然气处理规模为175×10⁴ m³/d(15.6 ℃,101.325 kPa),操作压力(G)9000 kPa,操作温度35 ℃的条件下,对贫TEG循环量及其质量分数、再沸器温度和汽提气流量进行模拟优化,得到最佳运行参数,并应用于生产操作。在此操作条件下,天然气脱水系统运行正常,干气中水质量浓度不大于30 mg/m³,满足干气外输要求。 

Abstract:

Aspen HYSYS software was used to simulate the process of natural gas dehydration in an offshore gas field Central Processing Platform. The main operation conditions were as follows:the capacity of natural gas is 175×10⁴ m³/d(15.6 ℃,101.325 kPa) with the contactor operating pressure and temperature is 9000 kPa and 35 ℃ respectively. The optimal process conditions could be obtained by simulating and optimizing the lean TEG circulation rate, lean TEG mass fraction, reboiler temperature and stripping gas rate. It was verified on site that the natural gas dehydration and regeneration system operated normally under above operation conditions. The water content of the export dry gas met the specification requirement which was less than 30 mg/m³.