六塔变压吸附制氧工艺的模拟与分析  

Simulation and analysis of oxygen production process by six-bed pressure swing adsorption process

作　　者：孔德齐 张莹莹 武文玲 马军 宋振兴 张东辉[1] 张彦军 KONG Deqi;ZHANG Yingying;WU Wenling;MA Jun;SONG Zhenxing;ZHANG Donghui;ZHANG Yanjun(School of Chemical Engineering and Technology,Tianjin University,Chemical Engineering Research Center,State Key Laboratory of Chemical Engineering,Tianjin 300350,China;Institute of Medical Support Technology,Academy of System Engineering,Academy of Military Sciences,Tianjin 300161,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,天津300350 [2]军事科学院系统工程研究院卫勤保障技术研究所,天津300161

出　　处：《化工学报》2023年第12期4934-4944,共11页CIESC Journal

基　　金：军内科研项目(JK20202A020154)。

摘　　要：采用13X分子筛作为吸附剂,设计了一种六塔变压吸附制氧工艺,可用于中型医用制氧机。通过静态容积法测定了氮氧气体在13X分子筛上的吸附等温线,建立了六塔变压吸附工艺的数学模型,包括吸附床模型和辅助设备的数学模型。利用Aspen Adsorption软件对工艺进行了数值模拟,分析了塔内的压力、温度和吸附相浓度分布。模拟结果表明,在吸附压力6 bar (1 bar=0.1 MPa)、步骤时长8 s、产品流量6 m^(3)·h^(-1)的条件下,O2产品纯度达93.83%,回收率46.85%,生产能力3.42×10^(-2) m^(3)·h^(-1)·kg^(-1)。相较于已有的两塔和四塔工艺,该工艺的回收率有所提高。探究了步骤时长、吸附压力和产品流量对氧气浓度、回收率和生产能力的影响。在4.5~7.5 m^(3)·h^(-1)的产品流量范围内,该工艺均可以制得90%以上纯度的氧气,可应用于氧气纯度需求不同的场景。A six-bed PSA oxygen production process was designed by using 13X zeolite as adsorbent,which can be used in medium-sized medical oxygen concentrators.The adsorption isotherms of nitrogen and oxygen on 13X zeolite were measured by the static volumetric method.A mathematical model of the pressure swing adsorption process was developed,including the mathematical model of adsorption bed and auxiliary equipment.The process was simulated by using Aspen Adsorption software,and the pressure,temperature and solids concentration distribution within the column were analyzed.The simulations demonstrated that the purity of oxygen is as high as 93% with a recovery rate of 46.85%,and the production capacity is 3.42×10~(-2) m~3·h~(-1)·kg~(-1) under 6 bar(1 bar=0.1MPa),8 s step duration and 6 m~3·h~(-1) product flow rate.Compared with the existing two-bed and four-bed processes,the recovery of this process has been improved.The effects of step duration,adsorption pressure,and product flow rate on oxygen concentration,recovery,and productivity were investigated.Moreover,as the product flow range expands to 4.5 m~3·h~(-1) to 7.5 m~3·h~(-1),this process can produce oxygen with a purity of more than 90% and can be applied to scenarios with different oxygen purity requirements.

关 键 词：变压吸附 数值模拟 制氧 13X分子筛 吸附剂 吸附 

分 类 号：TQ028.1[化学工程]