Q&A on Purification Technology Version [011]
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What is flooding? Answer: The phenomenon of liquid flowing back inside the tower is called flooding, and when flooding occurs, the pressure difference in the tower increases significantly. Foaming occurs when the amount of liquid entering the tower is greater than the amount leaving it, causing the liquid inside the tower to accumulate continuously until it fills the tower entirely, 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.
During the production process, in the distillation column, 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.
In a counter-current gas-liquid reactor or mass transfer separation device, the gas flows from bottom to top. When the flow rate of the gas increases to a certain value, the liquid is prevented from flowing downward by the gas; it accumulates more and more until it eventually overflows from the top of the tower. 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.
This post was last edited by wangld on 2017-7-20 08:06. The phenomenon of liquid flowing back inside the tower is called flooding, and when flooding occurs, the pressure difference within the tower increases significantly. Foaming occurs when the amount of liquid entering the tower is greater than the amount leaving it, causing the liquid inside the tower to accumulate continuously until it fills the tower entirely, 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.
For a tower of fixed diameter, the cross-section through which both gas and liquid phases can flow freely is limited. If the flow rate of either one of them increases to a certain limit, the liquid in the downcomer cannot flow downward smoothly ； When the liquid in the pipe rises to the top of the overflow weir on the upper plate, it will spill over onto that upper plate, causing abnormal accumulation of liquid; eventually, this can result in the space between the two plates being filled with foam. This phenomenon is known as flooding.
For a tower of fixed diameter, the cross-section through which both gas and liquid phases can flow freely is limited. If the flow rate of either one of them increases to a certain limit, the liquid in the downcomer cannot flow downward smoothly ； When the liquid in the pipe rises to the top of the overflow weir on the upper plate, it will spill over onto that upper plate, causing abnormal accumulation of liquid; eventually, this can result in the space between the two plates being filled with foam. This phenomenon is known as flooding.
The phenomenon of liquid flowing back inside the tower is called flooding, and when flooding occurs, the pressure difference in the tower increases significantly. Foaming occurs when the amount of liquid entering the tower is greater than the amount exiting it, causing the liquid inside the tower to accumulate continuously until the tower is completely filled with liquid, 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 due to the insufficient capacity of the downcomer to carry the liquid, a condition known as overflow flooding.
Inside the distillation column, the liquid flows downward layer by layer along the trays through the overflow trays, where it comes into contact with the hotter vapor on those trays; heat is transferred, and part of the liquid evaporates while part condenses. If the liquid on the tray has difficulty flowing down through the overflow tray, this causes the liquid level in the overflow tray to rise progressively until it reaches the same level as the liquid level on the tray, preventing further flow of the liquid. This condition is known as \"liquid suspension\" or \"liquid flooding\".
The phenomenon of liquid flowing back inside the tower is called flooding, and when flooding occurs, the pressure difference in the tower increases significantly. Foaming occurs when the amount of liquid entering the tower is greater than the amount exiting it, causing the liquid inside the tower to accumulate continuously until the tower is completely filled with liquid, 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 due to the insufficient capacity of the downcomer to carry the liquid, a condition known as overflow flooding.