CO_2/N_2分离中水合物膜形成的影响因素研究

Study on influencing factors of forming hydrate membrane in CO_2/N_2 separation

温室效应是如今人类所面临的一个重大问题,而二氧化碳对温室效应的"贡献"最大,因此发展研究捕集CO2的新型高效节能技术及相关理论,对避免温室效应,保护环境具有极其重要的意义.本文提出了将膜分离法和水合物法结合起来即水合物膜法,并利用自行组建的水合物膜法分离二氧化碳实验系统初步探索了多孔陶瓷管的孔径,体系的压力、温度、气体组成等条件对水合物膜形成的影响.结果表明,采用380 nm孔径的α-Al2O3陶瓷管组装成膜分离器,CO2/N2原料混合气中CO2含量越高,压力越高,温度越低,保持的静态时间越长,越有利于完整无缺陷的水合物膜的形成.

Greenhouse gases have become a serious world problem.CO2 is known to be the most prevalent greenhouse gas and has the potential to cause severe changes in the global climate.New energy-saving and effective technology to capture CO2 should be developed in present factory for CO2 Emission Reduction.It has scientific significance and broad application prospects in reducing the greenhouse effect and environmental protection.Hydrate membrane separation which combined hydrate with membrane separation has been proposed.Influencing factors of forming hydrate membrane such as the pore size of ceramic tube,gas composition,pressure and temperature were investigated using the self-established experimental apparatus of hydrate membrane separation for CO2 capture.The results demonstrate that α-Al2O3 ceramic tube with average pore diameter of 380 nm is better than the others for forming hydrate membrane.The CO2/N2 mixture gas with more CO2 will be more easy to form flawless hydrate membrane under condition of higher pressure,lower temperature and longer static time.