Time issue in pressure swing adsorption hydrogen production?

The pressure swing adsorption time is adjusted according to the hydrogen purity. To ensure reduced waste of useful gases, the adsorption time is adjusted accordingly. A high purity of hydrogen indicates a shorter adsorption time and higher precision; conversely, a higher hydrogen content in the released gas requires an extended adsorption time. Low purity suggests that the adsorption time was too long, as other gases besides hydrogen are trapped in the molecular sieve, resulting in a decrease in purity, hence the adsorption time needs to be shortened. This is because during the adsorption process, molecular sieves have the strongest and fastest affinity for hydrogen; as the time increases, the recovery rate improves but the purity decreases. On the other hand, when the time is short, the purity is higher, but the relatively lower recovery rate leads to waste. Typically, an optimal balance between these two factors is sought based on the requirements

This is why it is necessary to shorten the adsorption time to produce high-purity hydrogen (5 nines).

So what are the specific times for those adjustments? Ours has four T1, T2, T3, T4, and it operates by vacuum pumping…

I only jump to T1T2, because adjusting T1T2 causes other times to change as well, since the total duration of the program remains constant.

This post was last edited by dpclove21 on 2015-12-14 at 16:06. The adsorbent in the adsorption tank remains constant; as absorption proceeds, the impurities that are easily adsorbed are trapped, while pure hydrogen is discharged from the upper tower. At this point, the adsorption bed keeps moving upward; if the adsorption time is prolonged, the impurity layer will penetrate the adsorbent, resulting in a decrease in purity. The adsorption time is adjusted according to the required purity of hydrogen; as the adsorption time increases, the purity decreases while the hydrogen recovery rate increases ； Conversely, as the adsorption time decreases, the purity increases, while the hydrogen recovery rate decreases. Increase the hydrogen recovery rate as much as possible while ensuring product purity. The principle for adjusting the time is to ensure that pressure equalization in all towers can be completed smoothly, while extending the flushing time as much as possible. Check which time periods T1, T2, T3, and T4 correspond to respectively, and make the adjustments accordingly

This post was last edited by dpclove21 on 2015-12-14 at 16:05. Check which time periods T1, T2, T3, and T4 correspond to, and make the necessary adjustments