【Daily Question】In-depth processing 20160811: Term explanation – What is \"flooding\"?
Thread Content
To boost popularity and enhance technical exchanges among sea enthusiasts, 【One Question per Day】 is launched. Participation earns 4 points of wealth! 10 wealth points as a reward for correct answers or in-depth discussions! :lol Definition of a noun: What is “overflow”? Answer: The phenomenon of liquid floating occurs during the production process ============================== ☛【Haichuan Official Account】“Daily Recommendations” campaign for various sections: http://bbs.hcbbs.com/thread-1603884-1-1.html (Source: Haichuan Chemical Forum) ☛V Petrochemical Section’s “I’m Saving Energy, Where Are You?” voting has started: http://bbs.hcbbs.com/thread-1606794-1-1.html
If the liquid on the tray has difficulty flowing down through the overflow tray, causing the liquid level in the overflow tray to rise higher and higher until it reaches the same level as the liquid level on the tray and the liquid can no longer flow downward, this condition is known as \"liquid suspension\" or \"liquid flooding\".
When the liquid load in the tower is too high, it causes the liquids on the upper and lower trays of the distillation tower to merge together, thereby compromising the efficiency of distillation; 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.
An increased liquid load in the distillation column leads to chaotic distribution of the vapor and liquid phases on the trays, resulting in substandard product quality; failure to make adjustments in a timely manner can cause flooding of the column
During tower operation, the rising vapor does not undergo sufficient heat exchange with the reflux liquid, which is manifested on the tray as a retained liquid volume that is much larger than the equilibrium liquid volume. It is generally considered to be caused by an excessively high heating power of the reboiler
It is difficult for the liquid on the tray to flow down through the overflow weir, causing the liquid level in the overflow weir to rise higher and higher until it reaches the same level as the liquid level on the tray. When the liquid can no longer flow downward, this condition is known as \"liquid suspension\" or \"liquid flooding\".
Answer: In a distillation tower, the liquid flows downward layer by layer along the tray through the overflow weir, where it comes into contact with the hotter vapor on the tray, resulting in heat transfer as well as partial evaporation and partial condensation.
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, a phenomenon known as liquid flooding.
Foaming: In a tower of a certain diameter, the cross-sectional area available for the free flow of both gas and liquid phases is limited. If the flow rate of either one of them increases to a certain level, the liquid in the downcomer cannot flow downward smoothly ； When the liquid in the tube 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; ultimately, this can result in the space between the two plates being filled with foam. This phenomenon is known as flooding, or tower flooding