Liquid flooding in the evaporation system

Foaming occurs when the amount of rising vapor is high and the gas velocity is fast, which prevents the liquid from flowing downward; as a result, the liquid on the lower tray surges up to the upper tray. This phenomenon can be detected by observing through the sight glass and using a single-tray pressure drop meter. When flooding occurs, the vapor feed rate and feed volume to the tower should generally be reduced immediately; production can then be gradually resumed once the conditions inside the tower return to normal. If flooding occurs due to sediment deposition and blockage at the liquid outlet of the overflow pipe, it should be addressed by cleaning or flushing with steam. Even in the absence of flooding, plate-type equipment with poor self-cleaning capabilities for the trays should undergo regular steam cleaning operations to reduce accidents caused by sediment accumulation. When flooding occurs repeatedly and cannot be controlled outside the tower, it is necessary to consider whether there is a malfunction in the equipment and to shut it down for maintenance. Before the cause can be determined and the fault eliminated, driving the tower for testing should not be carried out blindly.