About PSA
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The final step in PSA is final desorption. I would like to ask why product hydrogen is used as the medium for this final desorption?
Even after the pressure has been increased to its maximum, the pressure in the adsorption tower still does not reach the pressure required for adsorption. If adsorption is carried out without using product hydrogen to raise the pressure to the required level, it will lead to significant pressure fluctuations. Additionally, an excessive pressure difference can cause wear and damage to the adsorbent, as well as affect the purity of the product hydrogen.
In fact, Yi Junsheng and Zhong Sheng are the same valve; when using Yi Junsheng, the product hydrogen is also pressurized through Junsheng
Apply additional pressure to reach the adsorption pressure! When the pressure is low and changes to medium levels, the purity of hydrogen gas decreases
Does it mean that as long as the adsorption pressure is reached, an ultimate pressure rise is not necessary?
Then what medium do you use to achieve the adsorption pressure?
Is stamping done using medium-speed air? The adsorbent will absorb certain impurities, and the purity cannot be maintained during the adsorption process!
There is indeed a process as you described, where PSA feed gas (such as medium-pressure shift gas) is used for the final filling, but as far as I know, it seems to have an impact on purity. The final charging process using product gas for reverse final charging has the effect of pushing impurities downward, whereas using medium-pressure gas for final charging not only introduces impurities earlier but also pushes them upward.