The column internals provide the contact place for mass transfer and heat transfer for the gas-liquid phase and the liquid-liquid phase; the main forms of the column internals are divided into two categories: packed towers and plate towers. Packed tower internals mainly include packing, liquid distributor, liquid collector redistributor, gas distributor, packing fastening device, packing support device; plate tower internals mainly include: tray, liquid collecting tank (plate tower), Tray support device (tray tower), feed distributor, gas feed and distribution device and demister, etc.

       A complete packed tower is composed of tower internals, packing and tower body. The function of the tower internals is to make the gas-liquid contact better in the tower, so as to exert the maximum production capacity and efficiency of the packed tower, so the design of the tower internals directly affects the operation of the entire packed tower. and filler performance. In addition, in addition to the inherent factors of the packing itself, the "amplification effect" of the packed column also has a great influence on it.

       The column internals mainly include the following parts: 1. Liquid distribution device, 2. Packing pressing device, 3. Packing support device, 4. Liquid collection and redistribution and feeding and discharging device, 5. Gas feeding and distribution device, 6. , De-foaming device.