SARS患者专用PSA制氧机变压吸附过程的数值模拟

Mathematical Simulation of PSA Processes of a Special Miniature Oxygen Concentrator for SARS Patients

基于微型变压吸附氧氮分离过程的特点和线性推动力模型,建立了描述该过程的数学模型,给出了求解的边界条件和初始条件,采用有限差分法对模型进行了求解.以产品气浓度和氧气回收率为例,对数值模拟结果和实验进行了比较,二者吻合良好.所建立的数学模型可以较为准确地模拟微型变压吸附条件下的氧氮分离过程,为深入研究SARS患者专用PSA制氧机及其吸附器结构优化打下了基础.

Based on the properties of miniature PSA oxygen production and a linear driving force （LDF） approximation, a mathematical model for PSA processes of a Special Miniature Oxygen Concentrator is developed in this paper. The boundary and initial conditions for the model are analyzed and determined, and the finite difference method is applied to solve the partial differential equations. By the product purity and oxygen recovery, the comparisons between the results of simulation and experiments have been made to show that they well agree with each other. The model developed can simulate exactly the PSA processes of separation of oxygen and nitrogen. It can be used to a further study of special oxygen concentrator for SARS patients and to optimization of the adsorber structure.