Olefin recovery system and method

The invention discloses an olefin recovery system and method, and relates to the field of petrochemical industry. The olefin recovery system comprises a first compressor, a depropanizing tower, a demethanizing tower, a deethanizing tower and a rectifying tower I. A demethanizing pretreatment module is arranged between the depropanizing tower and the demethanizing tower and is used for pretreating a material I at the top of the depropanizing tower, so that part of C2 and C3 products are separated in advance, and the load of the demethanizing tower is greatly reduced. 本申请公开了一种烯烃回收系统及方法，涉及石油化工领域。所述的烯烃回收烯烃包括第一压缩机、脱丙烷塔、脱甲烷塔、脱乙烷塔和精馏塔一，通过在脱丙烷塔和脱甲烷塔之间设置有脱甲烷预处理模块，对脱丙烷塔顶部的物料一进行预处理，这样提前分离出部分C2、C3产品，进而大大减少了脱甲烷塔的负荷。