PSA空气分离吸附过程中的压降特性研究

THE STUDY OF PRESSURE DROP IN THE ADSORPTION PROCESS OF AIR SEPARATION BY USING PSA METHOD

根据PSA分离空气制氧的基本理论 ,通过对我们自行研制的产氧量为Q =( 1～ 5)L/min的双吸附柱的小型PSA分离空气制氧系统进行的吸附过程的压力降的计算 ,分析了影响空气流经多孔吸附介质压降特性的操作参数、分子筛结构参数等重要因素 ,结果表明 :( 1 )空气流经PSA吸附柱多孔吸附介质的压降随流速的增大而增大 ,在较低流速范围内 (v=0 0 5m/s～ 0 1m/s) ,流速对压降的影响较小。在流速较高时 ,流速对压降的影响较大 ;( 2 )压降随空隙率的增大而减小。对于较高流速 ,低空隙率范围内 (ε =0 32～ 0 4 )空隙率对压降影响很大 ,是影响压降的最主要因素 ;( 3)压降随多孔吸附介质颗粒直径的增大而减小 ,在吸附介质颗粒直径较小的范围内 (d =1 6mm～ 2 0mm)

According to the basic theory for separating air by using pressure swing adsorption(PSA)method,we calculated the pressure drop in adsorption process of a separating air device by PSA method The device is a small scale oxygen device with two adsorption columns by using PSA which was constructed by ourselves The value of the flux of productive oxygen of the device is(1～5)L/min After the calculation,we analyzed the flow rate of the air through the adsorption column and the closeness(fractional void volume ε )and the diameter of a ZMS particle which have effects on the pressure drop The results show as follows:1 The pressure drop increases as the value of the flow rate of air increases When the value of the flow rate is in a lower area( v =0 5 m/s～0 1 m/s),the flow rate has little effect on the pressure drop When it is in a higher area,the flow rate has dramatic effect on the pressure drop 2 The pressure drop drops as the value of closeness increases When the value of the flow rate is higher and the value of the closeness is in a lower area( ε =0 32～0 4),the closeness has damatic effect on the pressure drop And the closeness is one of the main factors which have effect on the pressure drop 3 The pressure drop drops as the value of the diameter of the particle increases When the value of the diameter is in a lower area( d =1 6 mm～2 0 mm),the tendence is more evident