Thermal regeneration tower
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Under what conditions does a negative pressure occur in a thermal regeneration tower?
Too rapid pressure release in the regeneration tower can lead to negative pressure inside the tower, but this situation is rare
If the tower is sealed after parking to cool the existing gas phase, a negative pressure will be created
As mentioned above, when shutting down the system, too rapid pressure release or a too quick drop in temperature inside the tower can result in negative pressure within it. It is necessary to monitor changes in pressure inside the tower during shutdown, and to use nitrogen to maintain pressure promptly!
Here are my thoughts; please point out any mistakes if there are any: 1. When draining the liquid while the vehicle is parked, the nitrogen supply valve (or the top vent valve) was not opened, and this resulted in negative pressure when a large amount of liquid was drained； In fact, a large drop in liquid level without timely addition of nitrogen can also lead to negative pressure, though the likelihood is extremely low ； 2. When the vehicle is parked, the steam from the reboiler is released too quickly, causing a large amount of methanol vapor (or gas phase in the system) to condense; the lack of timely addition of nitrogen also leads to negative pressure ；
Reply to 1# qq492326038: I haven’t seen it. Learned* it