Abstract:

As a novel type of technology which integrates membrane separation technology with conventional phase contacting operation，membrane absorption will be widely used in global green-house effect mitigation and industrial，medical and astronautic application. Based on the recent progress of CO₂ separation from flue gas，the related principles，characteristic，process technology and material selection，mass transfer and its influence factors were studied and analyzed. The effects of module structure，gas and absorber flow mode in the process and membrane material on the separation performance were critical，the same as for other membrane contactors. Further，temperature control in operation could greatly help to enhance process mass transfer due to the characteristics of absorption.

摘要：

新型膜吸收技术是将膜分离与传统吸收技术耦合而成的高效分离技术，在减轻地球温室效应、保护环境以及工业、医学、宇航等多种实际利用领域具有广阔的发展空间。本文基于烟气CO₂分离膜吸收技术的现状和进展，在分离原理、工艺及材料选择、传质等关键方面进行了分析总结。结果表明，以醇胺溶液为基础的复合吸收剂较单一吸收液效果有很大提高。与其它膜接触器一样，膜吸收组器结构、流动方式及膜材料疏水性对吸收器性能存在较大影响。同时，由于其吸收特质，系统设计中选择合适温度可有效促进过程传质。