PLATE TYPE TOWER
Distilling Tower is a kind of stagewise contact mass transfer equipment used for gas-liquid or liquid-liquid system. It is composed of cylindrical tower and several tower plates horizontally installed inside the tower at certain intervals. It is widely used for rectification and absorption. Some types (such as sieve plate tower) are also used for extraction, and can also serve as a reactor for gas-liquid phase reaction. During the operation (taking the gas-liquid system as an example), under the effect of gravity, the liquid flows from top to bottom through tower plates of all layers in turn, and is discharged at the bottom of the tower. Driven by the differential pressure, the gas passes from bottom to top through tower plates of all layers in turn, and discharged at the top of the tower. A liquid layer of certain depth is maintained at each tower plate. The gas is dispersed into the liquid layers through the tower plates and contact mass transfer between phases is carried out.

PACKING TOWERThe packing tower is a kind of mass transfer equipment that adopts packing inside the tower as the component for gas-liquid contact. The tower is an upright cylinder. The packing support board is installed at the bottom. The packing is put on the support board through orderly or disordered piling. The packing plate is installed above the packing to prevent the packing from being blowing away by the rising airflow. The liquid is sprayed onto the packing through the liquid distributor from the top of the tower, and flows downwards along the surface of packing. The gas is fed from the bottom of the tower. After distributed by the gas distributor (small diameter towers normally have no gas distributor), it continuously passes through the intervals in the packing layer in the flow direction reverse to that of liquid. On the surface of packing, the two phases of gas and liquid closely contact to carry out mass transfer. The packing tower is a kind of continuous contact gas-liquid mass transfer equipment. The two phases constitute continuous change along the tower height. Under normal operation, gas phase is continuous phase and liquid phase is dispersed phase.