快速真空变压吸附制氧的排放气充压过程研究

测试了微型制氧吸附剂的平衡吸附特性,在此基础上选出适合快速真空变压吸附制氧的吸附剂.针对传统的单塔两步快速变压吸附制氧含量低问题,提出了提高产品气氧含量的单塔快速变压吸附制氧的排放气和原料气组合充压流程,并对该流程进行实验研究.结果表明:在单塔快速真空变压吸附制氧过程中,采用排放气和原料气组合充压流程可以有效提高产品气氧含量.充压前排放气的压力和氧含量是影响产品气氧含量的关键参数,采取合适的排放气压力和较高氧含量的排放气可获得更高的产品气氧含量.在吸附和解吸压力分别为240 k Pa和60 k Pa时,采用排放气和原料气组合充压的快速真空变压吸附流程可获得氧体积分数90%的产品气,其产氧率为325.08 L·h-1·kg-1. 

Study on pressurization with raffinate in a rapid vacuum pressure swing adsorption process for producing oxygen

The equilibrium adsorption characteristics of nitrogen adsorbents were tested and a suitable nitrogen adsorbent was selected for producing oxygen by rapid vacuum pressure swing adsorption. Due to low oxygen concentration in the product obtained by traditional rapid pressure swing adsorption,an improved pressurization step with raffinate was developed and experimentally studied in a rapid vacuum pressure swing adsorption system for producing oxygen. The results show that combined pressurization with raffinate and feed gas can effectively improve the oxygen concentration in the product during the rapid vacuum pressure swing adsorption process. The pressure and oxygen concentration of raffinate for pressurizing are key parameters to influence the oxygen concentration in the product,and a higher concentration oxygen product can be obtained by taking an appropriate pressure and a higher oxygen concentration of raffinate. The 90% oxygen can be generated by combined pressurization with raffinate and feed gas during the rapid vacuum pressure swing adsorption process with an adsorption pressure of 240 k Pa and a desorption pressure of 60 k Pa,and the adsorbent productivity is 325. 08 L·h-1·kg-1.