关键词: 液态乙烷, 存储工艺, 乙烷储罐, 子母罐, 蒸汽云爆炸, 准噶尔盆地南缘

Abstract: In order to improve the energy utilization rate and prolong the life cycle of Xinjiang Mahe Gas Field，its processing plant has switched to adopt the cryogenic technology of "refrigeration by expander + RSV" to recover ethane. This is the first natural gas processing plant that produces liquid ethane in China. At present，there is no guidance specification on the storage of liquid ethane available in China. By drawing on the engineering experience in designing cryogenic tanks of LNG plant，and integrating actual engineering conditions，the key design points of mother/daughter tank process flow is justified and analyzed，and a series of engineering issues such as the cold insulation materials and indicators of mother/daughter tank and piping，and the calculation of safety radius for the plan layout of mother/daughter tank are made clear. Moreover，design framework is summarized，and practical engineering problems are solved effectively. This study provides guidance and reference for the application of medium-small-sized cryogenic tanks in the development construction of gas fields. 

Key words: liquid ethane, storage technology, ethane tank, mother/daughter tank, vapor cloud explosion, southern margin of Junggar Basin