文献类型：期刊文献

英文题名：Enrichment of low-grade methane gas from nitrogen mixture by VPSA with CO2 displacement process: Modeling and experiment

作者：Qu, Donglei[1];Yang, Ying[1];Qian, Zhiling[1];Li, Ping[1];Yu, Jianguo[1];Ribeiro, Ana Mafalda[2];Rodrigues, Alirio E.[2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Porto, Fac Engn, Dept Chem Engn, Associated Lab LSRE LCM,Lab Separat & React Engn, Rua Dr Roberto Frias S-N, P-4200465 Porto, Portugal

年份：2020

卷号：380

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20193507370891);WOS:【SCI-EXPANDED(收录号:WOS:000494815600092)】；

基金：The authors wish to acknowledge National Natural Science Foundation of China (No. 21776089, No. U1610102, No. 51804127), the International S&T Cooperation Program of China (No. 2016YFE0132500), and the National Key Technology R&D Program of the Ministry of Science and Technology (No. 2015BAC04B01), China. POCI-01-0145-FEDER-006984 - Associate Laboratory LSRE-LCM funded by ERDF through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) - and by national funds through FCT - Fundacao para a Ciencia e a Tecnologia, Portugal

语种：英文

外文关键词：Methane enrichment; CH4/N-2 separation; VPSA process; Adsorption separation; CO2 displacement

摘要：To upgrade efficiently the low-concentration methane gas from nitrogen mixture, CO2 displacement was employed into the traditional vacuum pressure swing adsorption (VPSA) process to form the VPSA-CO2 DIS process. Non-isothermal and non-isobaric mathematical model for the VPSA-CO2 DIS process was developed, where ternary competitive adsorption equilibrium of CH4, N-2 and CO2 was calculated using IAST-Sips formulation, and bi-pore diffusion model was used to describe adsorption kinetics. Experiments were carried out to enrich the low-grade methane gas using one-bed four-step VPSA-CO2 DIS process with the home-made granular activated carbons (GACs), and results compared to process simulation predictions. Both experimental and simulated results confirmed that a high purity CH4 product gas (75.40% CH4) could be obtained continuously from 10% CH4 feed gas with 89.02% recovery. The combustion heat of the enriched CH4 product gas was estimated higher than the power consumption of this process, and carbon emissions penalty in this process was evaluated to be activated, so this VPSA-CO2 DIS process was technically feasible.