Packed tower, filled with large quantities of tower packings and tower internals, is an widely used and important gas-liquid mass transfer equipment. It was used in the industries from the mid-nineteenth century. With the development of packed tower, it is divided into plate tower and packed tower. Now, we will introduce the packed tower, which has simple structure, high filtering performance.
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The packed tower is composed of tower body, pedestal, padding supporting part, liquid distributor, liquid redistributor, tower packings, packing hold-down grid, etc.
Working principle of packed tower
Liquid enters from tower top and is evenly distributed onto tower packings through liquid distributors and then flow down along the packing surface. The gas enters from tower bottom and distributed evenly through gas distributor device. The gas raises up against the liquid path through void of tower packing. The gas and liquid will contact on the packing surface for mass transfer.
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The packed tower is a continuous contact type gas-liquid mass transfer equipment, which makes the two-phase composition change continuously along the tower height. In the normal condition, the gas phase presents continuous phase while the liquid phase presents dispersed phase.
When the liquid flow down along the packings, it has a tend to flow to the tower wall, which make the tower wall liquid quantity increase rapidly. This phenomenon is called wall flow, which may cause the nonuniform distribution of gas and liquid. To avoid it, liquid redistributors are placed in the middle of tower body when the packing layer is too high.
Compared with conventional structured packing, the pressure drop of DODGEN high-efficiency structured packing in distillation column is greatly reduced under the same efficiency, and the capacity can be increased by up to 40% under the same HETP
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