天然气深冷装置脱甲烷塔模拟研究

Research on the Demethanizer of Nature Gas Cryogenic Unit

脱甲烷塔是冷冻低温技术的核心设备,脱甲烷操作工况直接影响产品的纯度和乙烷回收率。同时,干气回流量、过冷气量、干气回流洗涤段理论塔板和过冷气洗涤段理论塔板均影响乙烷收率。文章通过分析新疆某天然气深冷处理装置,确定干气回流洗涤气量为12.5%,过冷洗涤气量为23.5%,脱甲烷塔全塔总理论板数选取24块,能够实现乙烷回收率>99%。

Demethanizer is the core equipment in nature gas cryogenic technique,the operating conditions of demethanization directly affect product purity of product and ethane recovery.At the same time,the influences of dry gas backflow,undercooling volume,dry gas backflow washing section theoretical tray and number of undercooling washing section theoretical tray on ethane recovery are studied by simulation basing on a natural gas cryogenic processing unit in Xinjiang.The dry gas reflux washing gas was 12.5%,subcooled washing gas 23.5%,theoretical tray 24,and the ethane recovery was more than 99%.