Pressure drop problem in packed towers
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The packing in the packed tower is structured wire mesh packing. Is the pressure drop caused by the packing greater, or is it greater when caused by the spray water?
If we analyze it based on these two reasons, it’s probably the spraying water that caused the problem
The principle of a packed tower is to increase the contact area between the rising gas and the flowing liquid. Regarding the resistance to the rising gas inside the tower, aside from the packing being fixed, the remaining factor is the amount of reflux liquid. When the upward gas flow rate remains constant, the greater the amount of liquid flowing downstream, the greater the resistance encountered; conversely, it is less. I don’t understand the term “pressure drop”. It’s just a guessed interpretation of the counterfeit version; for reference only.
The pressure drop in an empty tower is mainly due to the gas resistance caused by the packing. Once the packing is saturated, a liquid film forms on its surface, and this gas resistance represents a certain value. The gas resistance caused by the liquid increases as the spraying density increases, but it does not follow a linear relationship
At the same spray rate, the greater the specific surface area of the filler, the greater the pressure drop. For the same specific surface area, the greater the spray rate, the higher the pressure drop. When the spray rate for wire mesh packing is too high, the liquid film on the wire mesh doesn’t have time to be renewed; in such cases, structured sheet metal packing is a better choice. The packing pressure drop mainly occurs at the corners where two layers of packing meet. The Sulzer Plus type of packing can be used to reduce the pressure drop at these corners, or the angle of the packing can be adjusted to make it more vertical. X-shape