What to do if the liquid level in the overhead gas-liquid separator of the fractionation tower rises sharply?

No way, I guess there’s no other process left. What else can be done? Hurry up and switch to oil mode; be careful that gas doesn’t get into the furnace. Drain it out~ If possible, reduce the pressure

This topic has been discussed before. http://bbs.hcbbs.com/viewthread.php?tid=455665&highlight=%C1%BD%CC%A8%B4%D6%C6%FB%D3%CD%B1%C3

Reduce the temperature and dosage of the reaction, quickly identify the cause, and take decisive action. Currently, some units have a line connected to the outlet line of the top reflux pump, linking it to the outlet of the heavy gasoline pump; although the power ratings of the pumps differ slightly, they can still serve as a backup for each other in emergency situations to address immediate needs. It’s worth thinking carefully before raising this question; it’s better to be prepared for rain even when the weather is fine, as you can’t rule out the possibility of anything going wrong.

A full liquid level not only hinders the flow of rich gas, causing the pressure at the compressor inlet to drop and resulting in negative pressure, but it also draws large amounts of crude gasoline into the compressor, damaging the impellers inside it. At the same time, it causes the pressure at the top of the fractionation tower to become extremely high, as well as the pressures in the settler and regenerator, to such an extent that the main fan may even malfunction. Handling method: First, verify the actual liquid level in the on-site glass level gauge. When the liquid level is too high, follow these steps to handle it: (1) Start the backup pump; both pumps should operate simultaneously to divert the crude gasoline to the line for unqualified products ； (2) If the pump fails, it should be switched immediately; if it is a fault in the frequency conversion system, switch to normal frequency control promptly ； If the control valve fails, it should be switched to bypass control ； (3) Coordinate with the reaction unit to appropriately reduce the processing volume and reaction temperature; at the same time, adjust the load in the middle and upper sections of the distillation tower to lower the top temperature of the tower ； (4) Increase the dehydration process using the dehydration pack; in extremely urgent situations, the emergency vent valve can be opened to drain the crude gasoline from the tank, but this must be done under the supervision of a qualified person, with strict attention to safety ； (5) Through the above adjustments, if the liquid level is too high and both gasoline pumps cannot operate, report to the supervisor and proceed with shutting off the feed.

It is not advisable to use an emergency vent valve to discharge crude gasoline into the drain, as this can lead to serious safety accidents; caution is advised. Am I correct?

We press the crude gasoline under pressure into the raw material buffer tank for gasoline deodorization, and then pump it to the reject line. Generally, this pressure is 0.1 Mpa; it can be attempted to be driven by self-pressure to the tank area.

Both pumps are completely broken, so an emergency shutdown is necessary.