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| Packed tower | | |
Packed tower is a tower packing contacts between the two phases as the gas-liquid mass transfer equipment components. Packed column is always vertical cylindrical tower, the bottom with packing support plate, fill with heaps or placed in the way the whole puzzle support board. Install the top plate filler filler to avoid being blown updraft. Liquid from the top of the tower by the liquid distributor to fill the spray, and flow down along the filler surface.
Into the gas from the bottom, the gas distribution device (small diameter towers generally do not set gas distribution device) distribution, and the liquid was counter-current to pass through a gap filler layer, the filler surface, the gas-liquid mass transfer in close contact with an . Packed column is continuous contact mass transfer equipment, the two phases continuously changes along the tower height, in the normal operating state, the gas phase as continuous phase, liquid phase is dispersed.
When the liquid flows down along the fill layer, a gradual tendency to focus on the tower wall, making the liquid flow near the wall of the tower increases, a phenomenon known as the wall flow. Wall caused by gas-liquid two-phase flow effects in the uneven distribution of filler layer, so that the mass transfer efficiency decreased. Therefore, when the filler layer is high, the need for segmentation, distribution center and then set the device. Redistribution of liquid, including liquid collector unit and liquid re-distributor of two parts, the upper packing shed liquid collected by the liquid collector, to the distributor of liquid and then, after the re-distribution of the spray to the lower fill.
Packed tower with a large capacity, high separation efficiency, pressure drop, liquid holdup is small, the advantages of flexible operation. |
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