小型变压吸附制氧技术试验研究

Experimental Study on Small-Scale PSA Oxygen Generating

研究了分子筛种类、切换时间、均压步骤、高径比以及储气罐体积对小型变压吸附制氧效果的影响。实验表明,LiX分子筛的制氧效果最好,采用LiX分子筛可以减小制氧机的体积,并提高制氧机的性能;氧含量随着切换时间的增加先增加后减小,存在一个最佳切换时间,此切换时间要通过实验确定;均压步骤的引入可以很大程度上提高氧含量和回收率,起到很好的节能效果,其中吸附塔两端均压工艺的制氧效果最好。增加高径比有利于提高氧含量,但是高径比过大制氧效果会降低;增加储气罐的体积有利于提高氧含量。

The effects of some main factors, such as the species of molecular sieve, exchange time, pressure equalization process, ratio of height to diameter, the volume of tank on the process of small-scale pressure swing adsorption （PSA） oxygen generating are discussed experimentally. The experimental results show that different species of molecular sieve have different productivity and LiX is best; using LiX molecular sieve can decrease the volume of oxygen concentrator and improve the characteristics; with the increase of exchange time, the oxygen purity increases in the beginning and then decreases, the optimal exchange time is defined by experiment. The pressure equalization may improve the oxygen purity and recovery, the oxygen purity and recovery of the pressure equalization process in absorber＇s two-lets are the biggest. Increasing the ratio of height to diameter of the absorber can improve the oxygen purity, but it is not good if the ratio is too big. Increasing the volume of tank can also improve the oxygen purity.