Purification Technology Q&A Version [054]
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What is flooding? Answer: The phenomenon of liquid flowing back inside the tower is called flooding; when this occurs, the pressure difference in the tower increases significantly. Foaming occurs when the amount of liquid entering the tower exceeds the amount leaving it, causing the liquid inside the tower to keep accumulating until it fills the tower completely, thereby disrupting its normal operation. This phenomenon is referred to as foaming in engineering terms. One cause of flooding is caused by the entrainment of liquid droplets, which is known as entrained flooding ； Another reason is insufficient capacity of the downcomer to carry the liquid, which is known as overflow flooding.
The pressure drop across the upper and lower trays increases, preventing the liquid from flowing properly; once the liquid reaches a certain height, it overflows from the lower trays to the upper ones – this phenomenon is known as flooding
During the production process, in the distillation tower, if the flow rate of one of the two phases is too high, the pressure drop across the upper and lower trays increases to the point where the liquid can no longer flow downward properly. When the liquid level in the tubes reaches a certain height, the liquid from the lower trays spills over onto the upper trays; this phenomenon is known as flooding
Liquid flooding refers to the situation in a distillation column where, for various reasons, the liquid phase accumulates beyond the available space. Foaming can be divided into downcomer foaming, mist entrainment foaming, etc.
During the production process, in the distillation tower, if the flow rate of one of the two phases is too high, the pressure drop across the upper and lower trays increases to the point where the liquid can no longer flow downward properly. When the liquid level in the tubes reaches a certain height, the liquid from the lower trays spills over onto the upper trays; this phenomenon is known as flooding
When the liquid flow rate on a tray is high and the velocity of the rising gas is high, the amount of liquid carried by the gas to the upper tray increases significantly, causing the space between the trays to be filled with a gas-liquid mixture; ultimately, the entire tower becomes filled with gas and liquid. This phenomenon is known as entrained flooding； Because the downcomer channel is too small and presents high flow resistance, or due to other reasons that cause local blockages and narrowing in the downcomer, the liquid cannot flow smoothly downward through it; as a result, the liquid accumulates on the tray surfaces and fills the space between them. This phenomenon is known as flooding.
Foaming occurs during the countercurrent gas-liquid or countercurrent liquid-liquid contact process in a tower, when the flow rate is too high to allow for proper countercurrent operation. When the flooding point is reached in a tower with gas-liquid contact, the liquid cannot flow downward smoothly but spreads upward and is carried away in large quantities by the gas.
Liquid flooding refers to the situation in a distillation column where, for various reasons, the liquid phase accumulates beyond the available space.
The flow rate of liquid carried by the gas to the upper tray increases sharply, filling the space between the trays with a gas-liquid mixture; eventually, the entire tower becomes filled with gas and liquid. This phenomenon is known as entrained flooding
In a distillation column, when the liquid phase accumulates beyond the available space for various reasons, this phenomenon is known as flooding
Liquid flooding refers to the situation in a distillation column where, for various reasons, the liquid phase accumulates beyond the available space. Foaming can be divided into downcomer foaming, mist entrainment foaming, etc.