低压下碳纳米管用于水合物法捕集烟道气中CO_(2)动力学机制研究  

Study on kinetic mechanism of carbon nanotubes for CO_(2) capture from flue gas by hydrate method under low pressures

作　　者：王芳 安晓圣[2] 穆金池 冷帅 张瑞阳[2] 郭利红[3] 周莹 WANG Fang;AN Xiaosheng;MU Jinchi;LENG Shuai;ZHANG Ruiyang;GUO Lihong;ZHOU Ying(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,Sichuan,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,Sichuan,China;Sichuan Golden-Elephant Sincerity Chemical Co.,Ltd.,Meishan 620031,Sichuan,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西南石油大学新能源与材料学院,四川成都610500 [3]四川金象赛瑞化工股份有限公司,四川眉山620031

出　　处：《低碳化学与化工》2025年第2期148-156,共9页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家杰出青年科学基金(52325401);四川省自然科学基金(2023NSFSC0108)。

摘　　要：水合物法作为低能耗CO_(2)捕集技术,具有良好的应用前景。然而水合物法捕集CO_(2)目前还存在CO_(2)水合物生长速率较慢和CO_(2)捕集效率较低等问题。通过结合第一性原理、蒙特卡洛模拟和动力学实验,研究了较低初始压力(0.50~4.50 MPa)下,碳纳米管用于水合物法捕集烟道气中CO_(2)的动力学机制和捕集性能。结果表明,对于气体组成(体积分数计)为20%CO_(2)+80%N2的烟道气,在0.10~0.50 MPa下,双壁碳纳米管可通过分子间范德华力优先吸附CO_(2),且CO_(2)吸附量和CO_(2)选择率均在0.80 MPa附近达到峰值。综合考虑,由质量分数为0.01%的多壁碳纳米管和物质的量分数为4%的四氢呋喃组成的复合促进剂体系在2.50 MPa下表现出较好的捕集性能,其CO_(2)储气量为(3.54±0.28)mmol/mol,诱导时间为(24.33±1.53)min,CO_(2)捕集效率为76.75%±5.49%。As a low energy consumption CO_(2)capture technology,hydrate method has a good application prospect.However,there are still some problems such as slow CO_(2)hydrates growth rate and low CO_(2)capture efficiency in CO_(2)capture by hydrate method.By combining first principles,Monte Carlo simulation and kinetic experiments,the kinetic mechanism and capture performance of carbon nanotubes for CO_(2)capture from flue gas by hydrate method were studied under low initial pressure(from 0.50 MPa to 4.50 MPa).The results show that for the flue gas with the gas compositions(volume fraction)of 20%CO_(2)and 80%N2,double-walled carbon nanotubes have preferential adsorption of CO_(2)through the intermolecular van der Waals force under 0.10 MPa to 0.50 MPa.The CO_(2)adsorption capacity and CO_(2)selection rate both reach peak values near 0.80 MPa.Under comprehensive consideration,the compound accelerator system(multi-walled nanotubes mass fraction of 0.01%and tetrahydrofuran mole fraction of 4%)show relative good capture performance under 2.50 MPa,with the gas storage capacity of(3.54±0.28)mmol/mol,the induction time of(24.33±1.53)min and the CO_(2)capture efficiency of 76.75%±5.49%.

关 键 词：CO_(2)捕集 水合物法 碳纳米管 复合促进剂体系 动力学机制 

分 类 号：TE09[石油与天然气工程]