摘要
氧气是维持生命的基础物质,也是重要的工业原料。变压吸附技术能耗低、设备简单、装置灵活,被广泛用于空分制氧过程。随着制氧规模的扩大,径向流吸附器床层压降低、占地面积小、易于扩大生产规模等优势凸显,受到国内外用氧企业的普遍关注。然而,目前径向流制氧工艺的设计严重依赖经验,缺乏详细的分析研究。因此,建立了严格的径向流真空变压吸附系统数学模型。基于2塔8步工艺,以空气(N_(2)/O_(2)/Ar=78%/21%/1%)为原料气、LiLSX分子筛为吸附剂,考察了吸附时长、均压时长、吹扫进料比以及进料量对工艺性能的影响。重点分析了工艺达到循环稳态时吸附器出口端压力以及床层内温度、浓度的时空分布。模拟结果表明,O_(2)纯度与回收率分别为92.74%与61.88%时,生产能力高达121.10 m^(3)·h^(-1)·t^(-1)、能耗低至0.327 kWh·m^(-3)O_(2)。相较于已有的轴向流工艺,生产能力提升33.44 m^(3)·h^(-1)·t^(-1)、能耗降低0.017 kWh·m^(-3)O_(2)。本研究可以为径向流制氧工艺的设计与改进提供参考。
Oxygen is a fundamental substance for life and an important industrial raw material.Pressure swing adsorption technology,with its low energy consumption,simple equipment,and flexible setup,is widely used in air separation oxygen production processes.With the expansion of the scale of oxygen production,the advantages of radial flow adsorber bed pressure drop reduction,small footprint and easy expansion of production scale are highlighted.However,there is a lack of detailed analysis and research on the oxygen production of radial flow adsorber.Therefore,a strict mathematical model of radial flow vacuum pressure swing adsorption process was established.Based on the two-bed eight-step process,air(N_(2)/O_(2)/Ar=78%/21%/1%)was used as the feed gas and LiLSX molecular sieve was used as the adsorbent.The effects of adsorption time,pressure equalization time,purge feed ratio and feed flow rate on the process performance were investigated.The pressure at the outlet of the adsorber and the temporal and spatial distribution of the temperature and concentration in the bed were analyzed when the process reached the steady state of the cycle.The simulation results show that when the purity and recovery of O_(2)are 92.74% and 61.88%,respectively,the productivity is as high as 121.10 m^(3)·h^(-1)·t^(-1),and the energy consumption is as low as 0.327 kWh·m^(-3) O_(2).Compared with the existing axial flow process,this process has lower energy consumption and significantly improved productivity.This study can provide preference for the process improvement of radial flow adsorber.
作者
王进昊
李子易
唐忠利
李文彬
张东辉
WANG Jinhao;LI Ziyi;TANG Zhongli;LI Wenbin;ZHANG Donghui(State Key Laboratory of Chemical Engineering and Low-carbon Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)
出处
《化工学报》
北大核心
2026年第1期218-227,共10页
CIESC Journal
基金
国家自然科学基金项目(22478282)。
关键词
径向流吸附器
真空变压吸附
空气分离
制氧
数值模拟
radial flow adsorber
vacuum pressure swing adsorption
air separation
oxygen production
numerical simulation
