PSA purge replacement
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After the PSA is shut down, purging and replacement are carried out; in some cases the entire system is replaced at once, while in other cases each tower is replaced individually. How is the replacement done? Are there any better methods for replacement?
All towers are taken together for displacement; nitrogen is supplied through the inlet nitrogen line, and it is drained via the bottom drain valve
Initially, suppression and replacement can be carried out; later on, a programmable control system can be used for replacement (with a shorter time setting to allow for faster gas flow)
Set the programmable valve to manual mode, replace each adsorption tower one by one first, and then connect all the pipelines together for replacement.
Nitrogen is introduced in a timed manner, and the entire system is displaced simultaneously
It will operate automatically in the later stage; as for the adsorption time, we can only adjust T8 here, and T8 only allows for a setting of around ten seconds – should we set T8 to 1?
In this way, nitrogen is adsorbed and desorbed, and the gas released can be treated cleanly; however, it seems that the hydrogen pipeline cannot be cleaned properly
There’s no need to set it this low; if it’s too low, the gas flow will be poor instead
Follow the normal hydrogen extraction procedure; the pipe section must have purging at its end, and there should be no \"dead ends\"”~~
If you have an excess of nitrogen, you can pressurize the entire system at once, and then vent it through PSA for replacement； If there is insufficient nitrogen, it is necessary to proceed tower by tower, and replacement can be carried out through programmable valves