ZIF-8多孔材料吸附CO_(2)的格子Boltzmann模拟  

Lattice Boltzmann Simulation of CO_(2)Adsorption by ZIF-8 Porous Materials

作　　者：杨会盼 金晶[1] 赵健 侯封校 丁正浩 朱杰 YANG Huipan;JIN Jing;ZHAO Jian;HOU Fengxiao;DING Zhenghao;ZHU Jie(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Sinosteel Anshan Research Institute of Thermal-Energy Co.Ltd.,Anshan 114000,Liaoning Province,China;School of Energy and Power Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]中钢集团鞍山热能研究院有限公司,辽宁鞍山114000 [3]中北大学能源与动力工程学院,太原030051

出　　处：《动力工程学报》2023年第10期1363-1370,1376,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51976129);上海市科委地方能力建设资助项目(23010503500)。

摘　　要：基于格子Boltzmann方法,在表征体元尺度上研究了ZIF-8材料吸附烟气中CO_(2)的流动耦合传质过程。分别采用二维D2Q9、D2Q5模型描述速度场和浓度场,分析了ZIF-8吸附剂粒径在0.05~0.20 mm、孔隙率在0.50~0.80以及颗粒排列方式对CO_(2)吸附性能的影响,并描述了吸附床中的流动、扩散以及吸附现象。结果表明:粒径越大,吸附床中对流作用越强,吸附平衡所需时间减小;孔隙率越小,局部流速增大越明显,为避免流速过大造成局部吸附不充分,工程应用中宜采用孔隙率较大的ZIF-8吸附剂;与采用随机排列和错列排列相比,顺列分布时可有效缩短达到吸附平衡所需的时间;对CO_(2)吸附量影响的敏感性依次为孔隙率>排列方式>粒径,因此在实际应用中应首先考虑对ZIF-8孔隙率的选择。Based on lattice Boltzmann method,the flow-coupled mass transfer process of ZIF-8 material adsorbed CO_(2)from flue gas was studied at REV scale.The two-dimensional D2Q9 and D2Q5 models were used to describe the velocity and the concentration field.The influences of the particle size,porosity and arrangement of ZIF-8 adsorbent on the dynamic adsorption performance of CO_(2)gas were analyzed,and the flow,mass diffusion and adsorption phenomena in the adsorption bed were described.The size of ZIF-8 adsorbent was selected in the range of 0.05 mm to 0.20 mm,the porosity was selected in the range of 0.50 to 0.80.Results show that the larger the particle size,the stronger the convection in the adsorption bed,and the smaller the adsorption equilibrium time.The smaller the porosity,the more obvious the increase of local flow rate.In order to avoid insufficient local adsorption caused by excessive flow rate,ZIF-8 adsorbent with larger porosity should be used in engineering applications.Compared with random arrangement and disordered arrangement,the time needed to reach adsorption equilibrium can be effectively shortened in the case of sequential distribution.The sensitivity to the influence of CO_(2)adsorption is in the order of porosity>arrangement mode>particle size,so the porosity of ZIF-8 adsorbent should be considered first in practical applications.

关 键 词：二氧化碳捕集 格子BOLTZMANN方法 介尺度 吸附剂 沸石咪唑酯骨架结构材料 

分 类 号：TK09[动力工程及工程热物理]