摘要
吸附法是可替代高能耗天然气脱碳工艺的重要技术之一,高效吸附剂是高压低含CO_(2)的天然气脱碳的关键。以13X与一种改进工艺后制备的X型沸石(PIMX)为吸附剂,通过多种表征手段和室内动态吸附实验,探究材料物理化学特性及不同工艺参数对CO_(2)/CH_(4)分离性能的影响,并以实际介质压缩天然气为原料气进行现场中试实验。结果表明:PIMX的c(Si)/c(Al)低、比表面积与孔隙体积大,对高压低含CO_(2)混合气的分离性能优于13X;CO_(2)在沸石微孔内扩散速度低于CH_(4),但CO_(2)与沸石相互作用强,延长混合气与沸石的接触时间有利于CO_(2)/CH_(4)的分离;中试实验一定程度上验证了室内实验结果,CO_(2)出口物质的量分数为0.005%时PIMX在室内实验与中试实验中的CO_(2)吸附量分别为2.75和2.58 mmol/g。
Adsorption is one of the alternative techniques to the energy-intensive processes to remove CO_(2) in the natural gas,and the efficient adsorbents are critical to decarburization of the natural gas at a high pressure with a low CO_(2) concentration.The 13X and a process-improved zeolite X(PIMX)were chosen as the adsorbents.The effects of the material s physicochemical properties and process parameters on the CO_(2)/CH_(4) separation performance were studied by the material characterization and dynamic adsorption experiments in the lab.The dynamic adsorption of the real medium(compressed natural gas,CNG)on site for PIMX was conducted to verify the results in the lab.The results show that the PIMX zeolites with the smaller Si/Al ratio,the larger surface to volume ratio and the larger pore volume,exhibit a better separation performance than 13X.The diffusion rate of CO_(2) in the micropores of zeolites was slower than that of CH_(4).The interaction between CO_(2) and zeolites was stronger than that between CH_(4) and zeolites,so the longer contact time between gas mixture and zeolites is helpful to the separation.The pilot experiment on site verified the experimental results in the lab to some extent.The adsorption capacities of CO_(2) when the molar mass is 0.005%at the column outlet on PIMX in the lab and on site,were 2.75 and 2.58 mmol/g,respectively.
作者
孙永彪
唐建峰
刘鑫博
李光岩
花亦怀
胡苏阳
许涛
王铭
SUN Yongbiao;TANG Jianfeng;LIU Xinbo;LI Guangyan;HUA Yihuai;HU Suyang;XU Tao;WANG Ming(College of Pipeline and Civil Engineering in China University of Petroleum(East China),Qingdao 266580,China;College of Zhongran Engineering,Hebei Normal University,Shijiazhuang 050024,China;CNOOC Gas&Power Group Research&Development Center,Beijing 100027,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第4期160-167,共8页
Journal of China University of Petroleum(Edition of Natural Science)
基金
中海石油气电集团项目(HX20190625)。
关键词
吸附量
分离因子
沸石13X
天然气
adsorption capacity
separation factor
13X zeolite
natural gas
