Abstract Combining cryogenic flash units with membrane units is attractive for gas separation processes such as effluent gas recovery and CO2 capture. However, systematic design methodology for such hybrid systems have not been reported yet. The hybrid system is a complicated system that not only includes separation units, but also includes pressure manipulation units and heat exchangers. A two-step decomposition strategy is proposed to deal with the design of such complicated system. The separation sequence is first determined with energy consumption consideration in the first step. Subsequently, the remaining energy recovery units, the heat exchanger network and turbines are simultaneously synthesized with the separation flowsheet optimization. When applying the proposed strategy to recover the effluent gas from polyolefin plant, we find a novel flowsheet that avoid intensive capital and operating cost by tightly integration of process units.

中文翻译：

---

混合低温闪蒸和膜系统的优化设计

摘要 低温闪蒸装置与膜装置相结合对于气体分离过程（如废气回收和 CO2 捕获）具有吸引力。然而，尚未报道此类混合系统的系统设计方法。混合系统是一个复杂的系统，不仅包括分离单元，还包括压力操纵单元和热交换器。提出了一种两步分解策略来处理这种复杂系统的设计。在第一步中，首先考虑能源消耗来确定分离顺序。随后，剩余的能量回收单元、换热器网络和涡轮机与分离流程优化同时合成。当应用建议的策略从聚烯烃装置回收废气时，