1, packed tower
Tower body by several section can be connected with the cylinder, the tower body according to the properties of material being processed can be made of carbon steel and corrosion resistant materials, packing, filling a certain height in tower body is equipped with packing support plate at the bottom of the packing, packing pressure above the packing net, can be divided into several segments when packing layer through high filling, between two segments is equipped with liquid distribution device. The packed tower generally operates according to gas-liquid countercurrent, and the mixed gas enters the tower body from the bottom entrance, passes through the packing layer from bottom to top, and finally is discharged from the top gas outlet. Absorbent from the top of the tower through the liquid distributor, evenly sprayed into the packing layer along the surface of the packing layer flow down, until the bottom of the tower from the tube outlet out of the tower. Due to the continuous contact between the updraft and the descending hand sanitizer in the packing layer, the solute concentration in the updraft is getting lower and lower, and it reaches the absorption requirement and is discharged from the tower when it reaches the top. On the contrary, the solute concentration in the descending liquid is higher and higher, and it is discharged out of the tower when it reaches the top of the tower. The concentration of gas and liquid phase in the tower changes continuously along the tower height, so it is called separate-contact equipment.
2, plate tower
Plate tower is usually a cylindrical shell, in which several trays are arranged horizontally at a certain distance. As shown in Figure 14-2, liquid passes horizontally through each tray from top to bottom under the action of gravity and is discharged from the bottom of the tower, while gas, driven by pressure difference, passes through the holes in the tray from bottom to top and is discharged from the top of the tower. A certain amount of liquid is stored on each pedal. When gas passes through the liquid layer on the plate, the two phases contact mass transfer. That is, on the whole, the two phases are countercurrent flow, and the two phases are in uniform cross-flow contact on each plate, and the concentration of gas and liquid phase in the tower changes in a stepped manner along the height of the tower, so it is called step by step contact equipment.