Strange phenomena occurred during the first full-scale startup of the fully low-pressure air separation unit!
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At the beginning, when fluid accumulation started, the resistance in the lower tower was the same as that in the upper tower, both at 2.4 Kpa, and this situation persisted for about four hours. Was this a coincidence or was there some underlying reason for it? I hope experienced folks can give some guidance; let’s guess together!
If the instrument is fine, I think it’s a coincidence. I’ve never encountered such a phenomenon while driving; I don’t think I’ve paid attention to it
Reply to 3# feiniao0112: The instrument is absolutely fine
Hehehehehehe, it must be a coincidence! !
A coincidence in the accuracy of the instruments.
The possibility of coincidence is higher; let’s talk about the heights of the upper and lower towers
May I ask what type of tower is used in your plant – a packing tower or a sieve plate tower? Packed towers are possible! ! !
It is a normal phenomenon that during this accumulation phase, the air intake volume to the tower is relatively low, while the expansion volume is relatively high. What goes into the upper tower is entirely provided by the lower tower, and moreover, the cooling in the upper tower may not be very thorough.
This is a normal phenomenon during the liquid accumulation phase; there is no issue with the resistance in the upper tower. The formation of a liquid layer indicates that the throttling valves for liquid air and liquid nitrogen are set at high values, which is beneficial for liquid accumulation. The resistance is low when going down the tower, right? I think it’s because the liquid-air level in the lower part of the tower has not yet been established; the level is too low. As the level reaches the set height, the resistance will return to normal. If the liquid level is too high, the resistance will exceed the range. The book says that the liquid-air level has no impact on other factors, but practical experience shows that it does have an effect. This liquid level is meaningless during the liquid accumulation phase; it is best to pump everything into the upper tower. The original poster, check the history record to see if what I said is correct; please reply. . . If I’m right, I’ll tell you then. . . .
Reply to 10# Rank in the world: At that time, the gauge for measuring the liquid level was broken, so the displayed level was incorrect; there was no liquid actually present inside.