基于双回流变压吸附工艺的空气分离模拟及分析  

Simulation and analysis of dual-reflux pressure swing adsorption for air separation

作　　者：汪亚燕 田彩霞 丁兆阳 唐忠利[1] 张东辉[1] WANG Yayan;TIAN Caixia;DING Zhaoyang;TANG Zhongli;ZHANG Donghui(State Key Laboratory of Chemical Engineering,Chemical Engineering Research Center,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院化学工程研究所化学工程联合国家重点实验室

出　　处：《化工学报》2019年第10期4002-4011,共10页CIESC Journal

摘　　要：双回流变压吸附是一种在吸附塔中间位置进料,塔顶和塔底分别采用轻、重组分回流的变压吸附过程,能够同时生产两种高纯度、高回收率的产品气。以实验室自主合成的LiLSX分子筛为吸附剂,利用Aspen Adsorption模拟软件,对进料组成为78%N2/21%O2/1%Ar的实际空气进行了两塔双回流变压吸附的模拟研究。模拟结果表明:当原料气为78%N2/21%O2/1%Ar,吸附压力为2bar(1bar=10^5Pa),解吸压力为0.3bar,进料量为0.4m^3/h,轻组分回流流量为0.095L/min,重组分回流流量为5.22L/min时,能够得到体积分数为95.67%的O2和体积分数为98.25%的N2,回收率分别为94.60%和99.91%。并且进一步探究了进料位置、吸附时间、轻组分回流流量、重组分产品气流量等因素对O2和N2两种产品气纯度和回收率的影响。Double reflux pressure swing adsorption is a pressure swing adsorption process in which the feed is carried out in the middle of the adsorption tower,and the top and bottom of the tower are respectively reflowed with light and heavy components,and two high purity and high recovery product gases can be simultaneously produced. In this paper,a LiLSX zeolite synthesized by the laboratory was used as the adsorbent,meanwhile,numerical simulation of a two-bed dual-reflux pressure swing adsorption air separation process was carried out with feed mixture (78%N2/21%O2/1%Ar) using the commercial software Aspen Adsorption.The adsorption and desorption pressure are 2 bar and 0.3 bar,the feed flow rate is 0.4 m^3/h,the light and the heavy component reflux flow rate are 0.095 L/min and 5.22 L/min.Ultimately,the purity of O2 and N2 reach 95.67% and 98.25% in their respective product gas,and the recovery rates are 94.60% and 99.91%,respectively.Besides,effects of operating parameters (the feed position,duration of feed step,light reflux flow rate,heavy product flow rate) on the process performances were investigated,which was more helpful for understanding this process.

关 键 词：双回流 变压吸附 空气分离 LiLSX沸石 数值模拟 

分 类 号：TQ028.1[化学工程]