文献类型：期刊文献

英文题名：Mass and Heat Transfer of Pressure Swing Adsorption Oxygen Production Process with Small Adsorbent Particles

作者：Sun, Yuan[1];Zhang, Chuanzhao[2];Zhu, Xianqiang[1];Dong, Liang[1];Sun, Xianhang[1]

第一作者：Sun, Yuan

通讯作者：Zhu, XQ[1];Zhang, CZ[2]

机构：[1]Changzhou Univ, Sch Petr & Nat Gas Engn, Changzhou 213164, Peoples R China;[2]Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China

第一机构：Changzhou Univ, Sch Petr & Nat Gas Engn, Changzhou 213164, Peoples R China

通讯机构：[1]corresponding author), Changzhou Univ, Sch Petr & Nat Gas Engn, Changzhou 213164, Peoples R China;[2]corresponding author), Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China.|[1141726]北京联合大学生物化学工程学院;[11417]北京联合大学;

年份：2023

卷号：11

期号：8

外文期刊名：PROCESSES

收录：;EI(收录号：20241215779546);Scopus(收录号：2-s2.0-85169142350);WOS:【SCI-EXPANDED(收录号:WOS:001057104100001)】；

基金：This research was supported by the Academic Research Projects of Beijing Union University (No. ZK10202203, ZK70202102) and Changzhou University under Grant ZMF21020032,ZMF21020388.

语种：英文

外文关键词：pressure swing adsorption; air separation; rapid cycle; mass transfer; numerical analysis

摘要：Rapid-cycle pressure swing adsorption (PSA) with small adsorbents particles is intended to improve mass transfer rate and productivity. However, the mass transfer mechanisms are changed with reduction of particle size during rapid-cycle adsorption process. A heat and mass transfer model of rapid-cycle PSA air separation process employing small LiLSX zeolite particles is developed and experimentally validated to numerically analyze the effects of mass transfer resistances on the characteristics of cyclic adsorption process. Multicomponent Langmuir model and linear driving force model are employed for characterizing the adsorption equilibrium and kinetic. The results of numerical analysis demonstrate that the dominant mass transfer resistance of small adsorbents particles is a combination of film resistance, axial dispersion effect and macropore diffusion resistance. The oxygen purity, recovery and productivity of the product are overestimated by similar to 2-4% when the effect of axial dispersion on mass transfer is ignored. As particle size decreases, the front of nitrogen-adsorbed concentration and gas temperature become sharp, which effectively improves the performance. However, the adverse effect of axial dispersion on the mass transfer becomes significant at very small particles conditions. It is nearly identical shapes of nitrogen concentration and gas temperature profiles after adsorption and desorption steps. The profiles are pushed forward near the production end with an increase in bed porosities. The optimal oxygen recovery and productivity are achieved with a particle diameter of 0.45 mm and bed porosity of 0.39 during the PSA process.