摘要：In response to the demand for separating helium (He) and methane (CH4) from nitrogen (N2)-rich low-grade natural gas (NG), the gas separation effect of hydrate-based gas separation (HBGS) method for He extraction and CH4 recovery from N2-rich low-grade NG was studied. An innovative theoretical model is established for the prediction of the gas separation performance via HBGS. The average relative deviation (ARD) between the theoretical model calculation and the experimental measurement results is 2.12 %. Based on the response surface methodology, a low gas–liquid ratio (GLR), low temperature (T) and high pressure (P) are conductive to the improvement of the gas capture rate (GCR) and the He enrichment in the equilibrium gas (cHeeq), but not conducive to the CH4 enrichment in the dissociated gas (cCH4di). Among the factors, T has the most significant impact, followed by P and then GLR. Taking the GCR, cHeeq, cCH4di as evaluation indicators, multi-objective optimization was carried out based on RSM-NSGA-II and the entropy weight TOPSIS method. When the GLR, T and P are 80 NL/L, 279.15 K and 4.5 MPa respectively, the comprehensive separation performance via HBGS method is the best. After three-stage HBGS, the cHeeq increased from 0.61 mol% to 11.38 mol%, and the CH4 recovery factor (RF) reached 99.9 %. The goal of simultaneously concentrating He and recovering CH4 from N2-rich low-grade NG was achieved. This research provides theoretical basis and technical support for the promotion and application of HBGS technology in the gas separation. ? 2025

ISSN号：1383-5866

卷、期、页：v 376,

发表日期：2025-12-17

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：Separation and Purification Technology

通讯作者：曹嵘,孟丽娜

第一作者：徐振,刘曾奇,范士广,王逸伟,孙强,陈建义,郭绪强

论文类型：期刊论文

论文概要：徐振,曹嵘,孟丽娜,刘曾奇,范士广,王逸伟,孙强,陈建义,郭绪强，Enhancing helium extraction and methane recovery from N2-rich low-grade natural gas: a study based on RSM-NSGA-II coupled entropy weight TOPSIS using the HBGS method，Separation and Purification Technology，2025，v 376,

论文题目：Enhancing helium extraction and methane recovery from N2-rich low-grade natural gas: a study based on RSM-NSGA-II coupled entropy weight TOPSIS using the HBGS method