In the hydrogen production PSA system, the end-rise valve does not operate when one of the towers reaches its end rising point
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During the operation of the hydrogen production PSA system, when one of the towers reaches the end of its rising phase, the end-rise valve does not open at the set initial opening degree; as a result, this tower fails to reach the required pressure level, which causes fluctuations in the system pressure. The other towers are operating normally. Please identify the cause. Thank you
First, check whether the DCS system is sending out signals; if not, examine the program and conditions. Check the valve again after there is output.
It is usually caused by a fault in the programmable valve; one can check on-site whether the valve is operating properly and whether the remote feedback is functioning correctly； Also, if the PSA was working properly before and this issue suddenly occurred, there is generally no problem with the program itself
Check if there is a performance curve; according to what you said, first verify whether the average pressure rise of that tower is normal! The overall pressure is normal for the other towers; only this tower experiences fluctuations. It’s not likely to be a problem with the program Check the pressure equalizing valve, or maybe another valve that isn’t sealing properly! Which PSA do you use?
Our factory is located in the northeast; winter arrived a couple of days ago and the temperatures are low. As a result, several programmable valves in the PSA system stopped functioning. We then removed the faulty tower, took out the solenoid valves, heated them, and installed them back in place, after which normal operation was restored.
If there is a signal for the solenoid valve, check it; if there is no signal, replace the relay first. It seems like you lack experience.
Problems with the valve solenoid; repair or replacement required
You’re right; I remember that the final charging process is controlled by a valve that manages multiple towers. It’s not possible that only that one tower can’t be fed with fluid – it’s more likely that there’s a problem with some other step in the process
It is usually caused by a fault in the programmable valve; one can check on-site whether the valve is operating properly and whether the remote feedback is functioning correctly.
It is recommended to check the pressure curve; it is suspected that there is internal leakage in a valve of this tower, which causes the pressure in this tower to be higher than that in the other towers at the same elevation. As a result, the initial opening degree during pressure control at the end of the flushing process is very small or even zero
Check on-site whether this valve operates; it is estimated that a fault in the instrument control system is causing the valve not to function. Or this valve is stuck and cannot be opened. If nothing else works, cut out the tower and contact an instrumentation technician for repairs.