The downcomer of the tower is blocked

The possibility of a tower surge is high; poor liquid drainage leads to an increase in the liquid layer thickness, which in turn increases the tower pressure drop and raises the tower temperature. Once the gas breaks through the liquid layer, a large amount of liquid is vaporized, resulting in gas-liquid entrainment that causes a tower surge

A high tower pressure drop results in less liquid carried by the gas; does this lead to a decrease in temperature?

The tower gets flooded; a blockage in the downcomer prevents the liquid phase from flowing downward, and when the temperature drops, this leads to the tower becoming full

It can cause tower flooding and liquid leakage. In severe cases, the tower will be full.

If the liquid distributor becomes clogged, the downward flow of the liquid phase is blocked, resulting in an increase in the thickness of the liquid layer on the tray. This, in turn, leads to an increase in the pressure drop across the tower. When the liquid layer becomes too thick, it is carried upward by the gas phase, which is a precursor sign of flooding; flooding is also known as tower submersion. I don’t really understand tower punching; I’m still learning...

Both phenomena should occur, but on a localized basis. When the downcomer becomes blocked, the liquid phase in the few trays below it decreases, which leads to localized flooding of those trays. The liquid layer above the downcomer keeps increasing in thickness because the liquid phase cannot be discharged; as a result, the gas phase cannot pass through, leading to a brief situation of flooding of the tower. Of course, since there is always a gas phase present, the gas rising from the bottom of the tower carries liquid with it and comes into contact at that tray. If the pressure is sufficient to break through the liquid layer, then flooding of the tower occurs; if the pressure is insufficient, or if there is a buildup of pressure over time, the liquid layer will be broken through and carried upward. This is probably the most accurate guess based on practical conditions, but we need to consider whether the amount of heat supplied at the bottom of the tower is sufficient. The phenomenon is likely to be frequent fluctuations in the temperature gauge at that location; after ruling out the possibility of a faulty gauge, this could be due to blockages or salt buildup on the tray.

After blockage, placing a few plates back will cause the tower to flood again.

Simply put, flood the tower first, then flush it! The downcomer is blocked, the liquid layer on the tray increases, leading to tower flooding! If the gas flow is blocked, the tower pressure gradually increases, and in extreme cases, a tower surge occurs!