多孔LiOH孔隙特征及CO_(2)流动特性数值模拟  

Numerical Simulation of Pore Characteristics and CO_(2)Flow Characteristics of Porous LiOH

作　　者：陈元超 杨侠[1] 曹吉胤 刘迎 汪龙飞 CHEN Yuanchao;YANG Xia;CAO Jiyin;LIU Ying;WANG Longfei

机构地区：[1]武汉工程大学机电工程学院,湖北武汉430205

出　　处：《煤气与热力》2023年第6期V0008-V0012,共5页Gas & Heat

摘　　要：为了研究二氧化碳在新型多孔LiOH吸附剂孔隙中的流动规律,基于Sierpinski-Menger海绵结构建立三维分形孔隙模型,利用Fluent软件对LiOH孔隙中的气体流动进行数值模拟,分析不同流动速度(1、0.1、0.01 mm/s)下的流动规律。模拟结果表明,气体在海绵结构中流动具有分形特性,CO_(2)速率与动压在不同级数模型中分布一致,具有明显的对称性与相似性,说明在分形维数相同的情况下,不同级数模型具有相同的分形特征。通过对比3种入口气体流速(1、0.1、0.01 mm/s)对二氧化碳体积分数分布的影响,可知入口气体流速的增加有利于二氧化碳分布均匀,在允许的范围内增加入口气体流速有利于二氧化碳的吸附,提高LiOH吸附剂的吸附率。入口气体流速的改变只能改变CO_(2)动压、CO_(2)速率、总压的值,不影响它们在流场内的分布。这是由Sierpinski-Menger海绵分形模型自身的分形特性决定,不受边界条件的影响。可以得出总压力降与入口气体流速成线性关系。In order to study the flow law of carbon dioxide in the pores of a novel porous LiOH adsorbent,a threedimensional fractal pore model is established based on the Sierpinski Manger sponge structure.Fluent software is used to numerically simulate the gas flow in LiOH pores,and the flow law at different flow velocities(1,0.1 and 0.01 mm/s)are analyzed.The simulation results show that the gas flow in the sponge structure has fractal characteristics,and the distribution of CO_(2) rate and dynamic pressure in different series models is consistent,with obvious symmetry and similarity,indicating that different series models have the same fractal characteristics under the same fractal dimension.By comparing the effects of three different inlet gas flow rates(1,0.1 and 0.01mm/s)on the distribution of carbon dioxide volume fraction,it can be concluded that an increase in the inlet gas flow rate is conducive to the uniform distribution of carbon dioxide.Increasing the inlet gas flow rate within the allowable range is conducive to the adsorption of carbon dioxide and improves the adsorption rate of LiOH adsorbent.The change in inlet gas flow rate can only change the values of CO_(2) dynamic pressure,CO_(2) rate and total pressure,without affecting their distribution within the flow field.This is determined by the fractal characteristics of the Sierpinski Menger sponge fractal model itself,and is not affected by boundary conditions.It can be concluded that the total pressure drop has a linear relationship with the inlet gas flow rate.

关 键 词：多孔LiOH吸附剂 Sierpinski-Menger海绵结构 分形孔隙模型 CO_(2)吸附 

分 类 号：TQ028[化学工程]