【摘要】 低压气主要指油田伴生气及原油稳定尾气,它们一般都具有压力低、富含轻烃的特点。把天然气中的轻烃提取出来,可以改善商品气的质量和提高天然气的整体经济效益。为此,专门讨论了用低温分离法回收天然气中轻烃的工艺技术路线。经过对多种回收方案的计算与比较后得出,对低压气而言,采用复合制冷工艺——外部冷源循环制冷加气体膨胀制冷来回收天然气中的轻烃是非常经济和节省能源的选择。更多还原

【Abstract】 Low pressure gas often refers to associated gas and stabilized end gas in crude oil. They are characterized by low pressure and abundant light ends. Extracting light ends from natural gas is able to enhance the quality of commercial gas and the overall economic benefit. The technical process of recovering light ends from natural gas by low temperature separation is discussed. It is a very economical selection for low pressure gas adopting composite refrigeration process, combining external cold source cyclic refrigeration with gas expansion refrigeration,to recover light ends from natural gas after computing and comparing several recovery programs.更多还原